diff --git a/src/main/java/net/floodlightcontroller/core/FloodlightProvider.java b/src/main/java/net/floodlightcontroller/core/FloodlightProvider.java
index 16fdd19..c6d89a9 100644
--- a/src/main/java/net/floodlightcontroller/core/FloodlightProvider.java
+++ b/src/main/java/net/floodlightcontroller/core/FloodlightProvider.java
@@ -16,7 +16,7 @@
 import net.floodlightcontroller.storage.IStorageSourceService;
 import net.floodlightcontroller.threadpool.IThreadPoolService;
 import net.onrc.onos.ofcontroller.core.INetMapTopologyService.ITopoRouteService;
-import net.onrc.onos.ofcontroller.flowcache.IFlowService;
+import net.onrc.onos.ofcontroller.flowmanager.IFlowService;
 import net.onrc.onos.registry.controller.IControllerRegistryService;
 
 public class FloodlightProvider implements IFloodlightModule {
@@ -52,6 +52,7 @@
         dependencies.add(IRestApiService.class);
         dependencies.add(ICounterStoreService.class);
         dependencies.add(IThreadPoolService.class);
+        // Following added by ONOS
         dependencies.add(IFlowService.class);
         dependencies.add(ITopoRouteService.class);
         dependencies.add(IControllerRegistryService.class);
@@ -71,6 +72,7 @@
            context.getServiceImpl(IRestApiService.class));
        controller.setThreadPoolService(
            context.getServiceImpl(IThreadPoolService.class));
+       // Following added by ONOS
        controller.setFlowService(context.getServiceImpl(IFlowService.class));
        controller.setTopoRouteService(context.getServiceImpl(ITopoRouteService.class));
        controller.setMastershipService(
diff --git a/src/main/java/net/floodlightcontroller/core/IOFSwitch.java b/src/main/java/net/floodlightcontroller/core/IOFSwitch.java
index df609e7..d63624c 100644
--- a/src/main/java/net/floodlightcontroller/core/IOFSwitch.java
+++ b/src/main/java/net/floodlightcontroller/core/IOFSwitch.java
@@ -338,12 +338,6 @@
     Object removeAttribute(String name);
 
     /**
-     * Setup an unconnected switch with the info required.
-     * @param dpid of the switch
-     */
-    public void setupRemoteSwitch(Long dpid);
-    
-    /**
      * Clear all flowmods on this switch
      */
     public void clearAllFlowMods();
diff --git a/src/main/java/net/floodlightcontroller/core/IOFSwitchListener.java b/src/main/java/net/floodlightcontroller/core/IOFSwitchListener.java
index f8dd52c..1bc258b 100644
--- a/src/main/java/net/floodlightcontroller/core/IOFSwitchListener.java
+++ b/src/main/java/net/floodlightcontroller/core/IOFSwitchListener.java
@@ -17,8 +17,6 @@
 
 package net.floodlightcontroller.core;
 
-import org.openflow.protocol.OFPhysicalPort;
-
 /**
  *
  *
@@ -46,16 +44,6 @@
     public void switchPortChanged(Long switchId);
     
     /**
-     * Fired when ports on a switch area added
-     */
-    public void switchPortAdded(Long switchId, OFPhysicalPort port);
-    
-    /**
-     * Fired when ports on a switch area removed
-     */
-    public void switchPortRemoved(Long switchId, OFPhysicalPort port);
-    
-    /**
      * The name assigned to this listener
      * @return
      */
diff --git a/src/main/java/net/floodlightcontroller/core/internal/Controller.java b/src/main/java/net/floodlightcontroller/core/internal/Controller.java
index 878427a..e40f24a 100644
--- a/src/main/java/net/floodlightcontroller/core/internal/Controller.java
+++ b/src/main/java/net/floodlightcontroller/core/internal/Controller.java
@@ -73,10 +73,9 @@
 import net.floodlightcontroller.storage.OperatorPredicate;
 import net.floodlightcontroller.storage.StorageException;
 import net.floodlightcontroller.threadpool.IThreadPoolService;
-import net.onrc.onos.ofcontroller.core.INetMapStorage.DM_OPERATION;
+import net.onrc.onos.ofcontroller.core.IOFSwitchPortListener;
 import net.onrc.onos.ofcontroller.core.INetMapTopologyService.ITopoRouteService;
-import net.onrc.onos.ofcontroller.core.ISwitchStorage.SwitchState;
-import net.onrc.onos.ofcontroller.flowcache.IFlowService;
+import net.onrc.onos.ofcontroller.flowmanager.IFlowService;
 import net.onrc.onos.registry.controller.IControllerRegistryService;
 import net.onrc.onos.registry.controller.IControllerRegistryService.ControlChangeCallback;
 import net.onrc.onos.registry.controller.RegistryException;
@@ -140,14 +139,20 @@
 import org.slf4j.LoggerFactory;
 
 
-
 /**
  * The main controller class.  Handles all setup and network listeners
+ * 
+ * Extensions made by ONOS are:
+ * - Detailed Port event: PORTCHANGED -> {PORTCHANGED, PORTADDED, PORTREMOVED} 
+ *    Available as net.onrc.onos.ofcontroller.core.IOFSwitchPortListener
+ * - Distributed ownership control of switch through RegistryService(IControllerRegistryService)
+ * - Register ONOS services. (IFlowService, ITopoRouteService, IControllerRegistryService)
+ * - Additional DEBUG logs
+ * - Try using hostname as controller ID, when ID was not explicitly given.
  */
 public class Controller implements IFloodlightProviderService, 
             IStorageSourceListener {
-   	
-	
+    
     protected static Logger log = LoggerFactory.getLogger(Controller.class);
 
     private static final String ERROR_DATABASE = 
@@ -270,10 +275,11 @@
     }
     /**
      * Update message indicating a switch was added or removed 
+     * ONOS: This message extended to indicate Port add or removed event.
      */
     protected class SwitchUpdate implements IUpdate {
         public IOFSwitch sw;
-        public OFPhysicalPort port;
+        public OFPhysicalPort port; // Added by ONOS
         public SwitchUpdateType switchUpdateType;
         public SwitchUpdate(IOFSwitch sw, SwitchUpdateType switchUpdateType) {
             this.sw = sw;
@@ -302,10 +308,14 @@
                             listener.switchPortChanged(sw.getId());
                             break;
                         case PORTADDED:
-                        	listener.switchPortAdded(sw.getId(), port);
+                        	if (listener instanceof IOFSwitchPortListener) {
+                        		((IOFSwitchPortListener) listener).switchPortAdded(sw.getId(), port);
+                        	}
                         	break;
                         case PORTREMOVED:
-                        	listener.switchPortRemoved(sw.getId(), port);
+                        	if (listener instanceof IOFSwitchPortListener) {
+                        		((IOFSwitchPortListener) listener).switchPortRemoved(sw.getId(), port);
+                        	}
                         	break;
                         default:
                         	break;
@@ -804,10 +814,9 @@
                     dfuture);
 
         }
- 
+        
       	volatile Boolean controlRequested = Boolean.FALSE;
         protected void checkSwitchReady() {
-  
             if (state.hsState == HandshakeState.FEATURES_REPLY &&
                     state.hasDescription && state.hasGetConfigReply) {
                 
@@ -1143,7 +1152,7 @@
                             }
                             state.firstRoleReplyReceived = true;
                             Role requestedRole = 
-                            		sw.deliverRoleRequestNotSupported(error.getXid());
+                            		sw.deliverRoleRequestNotSupportedEx(error.getXid());
                             synchronized(roleChanger) {
                                 if (sw.role == null && Controller.this.role==Role.SLAVE) {
                                 	//This will now never happen. The Controller's role
@@ -1622,7 +1631,6 @@
         // from slave controllers. Then we need to move this cancelation
         // to switch disconnect
         sw.cancelAllStatisticsReplies();
-        
             
         // FIXME: I think there's a race condition if we call updateInactiveSwitchInfo
         // here if role support is enabled. In that case if the switch is being
@@ -1634,7 +1642,6 @@
         // of the switch state that's written to storage.
         
         updateInactiveSwitchInfo(sw);
-        
         SwitchUpdate update = new SwitchUpdate(sw, SwitchUpdateType.REMOVED);
         try {
             this.updates.put(update);
@@ -2228,13 +2235,11 @@
         this.updates = new LinkedBlockingQueue<IUpdate>();
         this.factory = new BasicFactory();
         this.providerMap = new HashMap<String, List<IInfoProvider>>();
-        
         setConfigParams(configParams);
         //this.role = getInitialRole(configParams);
         //Set the controller's role to MASTER so it always tries to do role requests.
         this.role = Role.MASTER;
         this.roleChanger = new RoleChanger();
-		
         initVendorMessages();
         this.systemStartTime = System.currentTimeMillis();
     }
diff --git a/src/main/java/net/floodlightcontroller/core/internal/OFSwitchImpl.java b/src/main/java/net/floodlightcontroller/core/internal/OFSwitchImpl.java
index e0ff8c3..0eca19c 100644
--- a/src/main/java/net/floodlightcontroller/core/internal/OFSwitchImpl.java
+++ b/src/main/java/net/floodlightcontroller/core/internal/OFSwitchImpl.java
@@ -44,6 +44,7 @@
 import net.floodlightcontroller.core.web.serializers.DPIDSerializer;
 import net.floodlightcontroller.threadpool.IThreadPoolService;
 import net.floodlightcontroller.util.TimedCache;
+import net.onrc.onos.ofcontroller.core.IOnosRemoteSwitch;
 
 import org.codehaus.jackson.annotate.JsonIgnore;
 import org.codehaus.jackson.annotate.JsonProperty;
@@ -75,7 +76,7 @@
 /**
  * This is the internal representation of an openflow switch.
  */
-public class OFSwitchImpl implements IOFSwitch {
+public class OFSwitchImpl implements IOFSwitch, IOnosRemoteSwitch {
     // TODO: should we really do logging in the class or should we throw
     // exception that can then be handled by callers?
     protected static Logger log = LoggerFactory.getLogger(OFSwitchImpl.class);
@@ -268,7 +269,7 @@
     public void disconnectOutputStream() {
         channel.close();
     }
-    
+
     @Override
     @JsonIgnore
     public void setFeaturesReply(OFFeaturesReply featuresReply) {
@@ -787,7 +788,18 @@
      * Otherwise we ignore it.
      * @param xid
      */
-    protected Role deliverRoleRequestNotSupported(int xid) {
+    protected void deliverRoleRequestNotSupported(int xid) {
+        deliverRoleRequestNotSupportedEx(xid);
+    }
+
+    /**
+     * ONOS Extension to deliverRoleRequestNotSupported().
+     * This version return the Roll request made.
+     * @see deliverRoleRequestNotSupported
+     * @param xid
+     * @return Role of attempted RoleRequest.
+     */
+    protected Role deliverRoleRequestNotSupportedEx(int xid) {
         synchronized(pendingRoleRequests) {
             PendingRoleRequestEntry head = pendingRoleRequests.poll();
             this.role = null;
diff --git a/src/main/java/net/floodlightcontroller/core/internal/RoleChanger.java b/src/main/java/net/floodlightcontroller/core/internal/RoleChanger.java
index b2de649..4924fbc 100644
--- a/src/main/java/net/floodlightcontroller/core/internal/RoleChanger.java
+++ b/src/main/java/net/floodlightcontroller/core/internal/RoleChanger.java
@@ -277,8 +277,9 @@
                     // Handle cases #1 and #2
                 	log.debug("Sending NxRoleRequest to {}", sw);
                     sw.sendNxRoleRequest(role, cookie);
-                } else {         
+                } else {
                 	if (role == Role.MASTER) {
+                		// ONOS extension:
                 		log.debug("Switch {} doesn't support NxRoleRequests, but sending " + 
                 					"{} request anyway", sw, role);
                 		//Send the role request anyway, even though we know the switch
diff --git a/src/main/java/net/floodlightcontroller/core/web/CoreWebRoutable.java b/src/main/java/net/floodlightcontroller/core/web/CoreWebRoutable.java
index 95053bd..7604d7c 100644
--- a/src/main/java/net/floodlightcontroller/core/web/CoreWebRoutable.java
+++ b/src/main/java/net/floodlightcontroller/core/web/CoreWebRoutable.java
@@ -20,9 +20,9 @@
 import net.floodlightcontroller.core.module.ModuleLoaderResource;
 import net.floodlightcontroller.restserver.RestletRoutable;
 import net.onrc.onos.ofcontroller.core.web.ClearFlowTableResource;
+import net.onrc.onos.ofcontroller.core.web.TopoLinksResource;
 import net.onrc.onos.ofcontroller.core.web.TopoSwitchesResource;
 import net.onrc.onos.ofcontroller.devicemanager.web.TopoDevicesResource;
-import net.onrc.onos.ofcontroller.linkdiscovery.web.TopoLinksResource;
 
 import org.restlet.Context;
 import org.restlet.Restlet;
@@ -63,6 +63,7 @@
         router.attach("/role/json", ControllerRoleResource.class);
         router.attach("/health/json", HealthCheckResource.class);
         router.attach("/system/uptime/json", SystemUptimeResource.class);
+        // Following added by ONOS
         router.attach("/topology/switches/{filter}/json", TopoSwitchesResource.class);
         router.attach("/topology/links/json", TopoLinksResource.class);
         router.attach("/topology/devices/json", TopoDevicesResource.class);
diff --git a/src/main/java/net/floodlightcontroller/core/web/EventHistoryTopologyClusterResource.java b/src/main/java/net/floodlightcontroller/core/web/EventHistoryTopologyClusterResource.java
index 1be942c..648866f 100644
--- a/src/main/java/net/floodlightcontroller/core/web/EventHistoryTopologyClusterResource.java
+++ b/src/main/java/net/floodlightcontroller/core/web/EventHistoryTopologyClusterResource.java
@@ -1,9 +1,9 @@
 package net.floodlightcontroller.core.web;
 
-import net.floodlightcontroller.linkdiscovery.ILinkDiscoveryService;
-import net.floodlightcontroller.linkdiscovery.internal.EventHistoryTopologyCluster;
-import net.floodlightcontroller.linkdiscovery.internal.LinkDiscoveryManager;
 import net.floodlightcontroller.util.EventHistory;
+import net.onrc.onos.ofcontroller.linkdiscovery.ILinkDiscoveryService;
+import net.onrc.onos.ofcontroller.linkdiscovery.internal.EventHistoryTopologyCluster;
+import net.onrc.onos.ofcontroller.linkdiscovery.internal.LinkDiscoveryManager;
 
 import org.restlet.resource.Get;
 import org.restlet.resource.ServerResource;
diff --git a/src/main/java/net/floodlightcontroller/core/web/EventHistoryTopologyLinkResource.java b/src/main/java/net/floodlightcontroller/core/web/EventHistoryTopologyLinkResource.java
index 4a21070..79c4006 100644
--- a/src/main/java/net/floodlightcontroller/core/web/EventHistoryTopologyLinkResource.java
+++ b/src/main/java/net/floodlightcontroller/core/web/EventHistoryTopologyLinkResource.java
@@ -1,9 +1,9 @@
 package net.floodlightcontroller.core.web;
 
-import net.floodlightcontroller.linkdiscovery.ILinkDiscoveryService;
-import net.floodlightcontroller.linkdiscovery.internal.EventHistoryTopologyLink;
-import net.floodlightcontroller.linkdiscovery.internal.LinkDiscoveryManager;
 import net.floodlightcontroller.util.EventHistory;
+import net.onrc.onos.ofcontroller.linkdiscovery.ILinkDiscoveryService;
+import net.onrc.onos.ofcontroller.linkdiscovery.internal.EventHistoryTopologyLink;
+import net.onrc.onos.ofcontroller.linkdiscovery.internal.LinkDiscoveryManager;
 
 import org.restlet.resource.Get;
 import org.restlet.resource.ServerResource;
diff --git a/src/main/java/net/floodlightcontroller/core/web/EventHistoryTopologySwitchResource.java b/src/main/java/net/floodlightcontroller/core/web/EventHistoryTopologySwitchResource.java
index 1c95e2c..4a81db4 100644
--- a/src/main/java/net/floodlightcontroller/core/web/EventHistoryTopologySwitchResource.java
+++ b/src/main/java/net/floodlightcontroller/core/web/EventHistoryTopologySwitchResource.java
@@ -1,9 +1,9 @@
 package net.floodlightcontroller.core.web;
 
-import net.floodlightcontroller.linkdiscovery.ILinkDiscoveryService;
-import net.floodlightcontroller.linkdiscovery.internal.EventHistoryTopologySwitch;
-import net.floodlightcontroller.linkdiscovery.internal.LinkDiscoveryManager;
 import net.floodlightcontroller.util.EventHistory;
+import net.onrc.onos.ofcontroller.linkdiscovery.ILinkDiscoveryService;
+import net.onrc.onos.ofcontroller.linkdiscovery.internal.EventHistoryTopologySwitch;
+import net.onrc.onos.ofcontroller.linkdiscovery.internal.LinkDiscoveryManager;
 
 import org.restlet.resource.Get;
 import org.restlet.resource.ServerResource;
diff --git a/src/main/java/net/floodlightcontroller/devicemanager/internal/DeviceManagerImpl.java b/src/main/java/net/floodlightcontroller/devicemanager/internal/DeviceManagerImpl.java
index feccdc4..04543ac 100755
--- a/src/main/java/net/floodlightcontroller/devicemanager/internal/DeviceManagerImpl.java
+++ b/src/main/java/net/floodlightcontroller/devicemanager/internal/DeviceManagerImpl.java
@@ -59,7 +59,6 @@
 import net.floodlightcontroller.flowcache.IFlowReconcileListener;
 import net.floodlightcontroller.flowcache.IFlowReconcileService;
 import net.floodlightcontroller.flowcache.OFMatchReconcile;
-import net.floodlightcontroller.linkdiscovery.ILinkDiscovery.LDUpdate;
 import net.floodlightcontroller.packet.ARP;
 import net.floodlightcontroller.packet.DHCP;
 import net.floodlightcontroller.packet.Ethernet;
@@ -71,6 +70,7 @@
 import net.floodlightcontroller.topology.ITopologyListener;
 import net.floodlightcontroller.topology.ITopologyService;
 import net.floodlightcontroller.util.MultiIterator;
+import net.onrc.onos.ofcontroller.linkdiscovery.ILinkDiscovery.LDUpdate;
 import static net.floodlightcontroller.devicemanager.internal.
 DeviceManagerImpl.DeviceUpdate.Change.*;
 
diff --git a/src/main/java/net/floodlightcontroller/staticflowentry/StaticFlowEntryPusher.java b/src/main/java/net/floodlightcontroller/staticflowentry/StaticFlowEntryPusher.java
index 371a479..4ed59d7 100644
--- a/src/main/java/net/floodlightcontroller/staticflowentry/StaticFlowEntryPusher.java
+++ b/src/main/java/net/floodlightcontroller/staticflowentry/StaticFlowEntryPusher.java
@@ -39,7 +39,6 @@
 import org.openflow.protocol.OFFlowRemoved;
 import org.openflow.protocol.OFMatch;
 import org.openflow.protocol.OFMessage;
-import org.openflow.protocol.OFPhysicalPort;
 import org.openflow.protocol.OFType;
 import org.openflow.protocol.factory.BasicFactory;
 import org.openflow.util.HexString;
@@ -676,17 +675,5 @@
             Map<String, String> removedControllerNodeIPs) {
         // ignore
     }
-
-	@Override
-	public void switchPortAdded(Long switchId, OFPhysicalPort port) {
-		// TODO Auto-generated method stub
-		
-	}
-
-	@Override
-	public void switchPortRemoved(Long switchId, OFPhysicalPort port) {
-		// TODO Auto-generated method stub
-		
-	}
      
 }
diff --git a/src/main/java/net/floodlightcontroller/topology/ITopologyService.java b/src/main/java/net/floodlightcontroller/topology/ITopologyService.java
index cc62e82..31032c9 100644
--- a/src/main/java/net/floodlightcontroller/topology/ITopologyService.java
+++ b/src/main/java/net/floodlightcontroller/topology/ITopologyService.java
@@ -5,7 +5,7 @@
 import java.util.Set;
 
 import net.floodlightcontroller.core.module.IFloodlightService;
-import net.floodlightcontroller.linkdiscovery.ILinkDiscovery.LDUpdate;
+import net.onrc.onos.ofcontroller.linkdiscovery.ILinkDiscovery.LDUpdate;
 
 public interface ITopologyService extends IFloodlightService  {
 
diff --git a/src/main/java/net/floodlightcontroller/topology/NodePortTuple.java b/src/main/java/net/floodlightcontroller/topology/NodePortTuple.java
index 6ac8f29..4983529 100644
--- a/src/main/java/net/floodlightcontroller/topology/NodePortTuple.java
+++ b/src/main/java/net/floodlightcontroller/topology/NodePortTuple.java
@@ -18,16 +18,6 @@
     protected short portId; // switch port id
 
     /**
-     * A copy constructor for NodePortTuple.
-     *
-     * @param other the object to copy the state from.
-     */
-    public NodePortTuple(NodePortTuple other) {
-	this.nodeId = other.nodeId;
-	this.portId = other.portId;
-    }
-
-    /**
      * Creates a NodePortTuple
      * @param nodeId The DPID of the switch
      * @param portId The port of the switch
diff --git a/src/main/java/net/floodlightcontroller/topology/TopologyManager.java b/src/main/java/net/floodlightcontroller/topology/TopologyManager.java
index 27f4df2..a47a5f2 100644
--- a/src/main/java/net/floodlightcontroller/topology/TopologyManager.java
+++ b/src/main/java/net/floodlightcontroller/topology/TopologyManager.java
@@ -28,8 +28,6 @@
 import net.floodlightcontroller.core.module.IFloodlightService;
 import net.floodlightcontroller.core.util.SingletonTask;
 import net.floodlightcontroller.counter.ICounterStoreService;
-import net.floodlightcontroller.linkdiscovery.ILinkDiscoveryListener;
-import net.floodlightcontroller.linkdiscovery.ILinkDiscoveryService;
 import net.floodlightcontroller.packet.BSN;
 import net.floodlightcontroller.packet.Ethernet;
 import net.floodlightcontroller.packet.LLDP;
@@ -39,7 +37,8 @@
 import net.floodlightcontroller.routing.Route;
 import net.floodlightcontroller.threadpool.IThreadPoolService;
 import net.floodlightcontroller.topology.web.TopologyWebRoutable;
-import net.onrc.onos.ofcontroller.core.INetMapStorage.DM_OPERATION;
+import net.onrc.onos.ofcontroller.linkdiscovery.ILinkDiscoveryListener;
+import net.onrc.onos.ofcontroller.linkdiscovery.ILinkDiscoveryService;
 
 import org.openflow.protocol.OFMessage;
 import org.openflow.protocol.OFPacketIn;
diff --git a/src/main/java/net/floodlightcontroller/topology/web/TopologyWebRoutable.java b/src/main/java/net/floodlightcontroller/topology/web/TopologyWebRoutable.java
index 7989413..4f844b2 100644
--- a/src/main/java/net/floodlightcontroller/topology/web/TopologyWebRoutable.java
+++ b/src/main/java/net/floodlightcontroller/topology/web/TopologyWebRoutable.java
@@ -3,8 +3,9 @@
 import org.restlet.Context;
 import org.restlet.routing.Router;
 
-import net.floodlightcontroller.linkdiscovery.web.LinksResource;
 import net.floodlightcontroller.restserver.RestletRoutable;
+import net.onrc.onos.ofcontroller.linkdiscovery.web.LinksResource;
+import net.onrc.onos.ofcontroller.topology.web.RouteResource;
 
 public class TopologyWebRoutable implements RestletRoutable {
     /**
diff --git a/src/main/java/net/floodlightcontroller/util/MACAddress.java b/src/main/java/net/floodlightcontroller/util/MACAddress.java
index 1bc137c..88dbda2 100644
--- a/src/main/java/net/floodlightcontroller/util/MACAddress.java
+++ b/src/main/java/net/floodlightcontroller/util/MACAddress.java
@@ -5,7 +5,6 @@
 import net.onrc.onos.ofcontroller.util.serializers.MACAddressDeserializer;
 import net.onrc.onos.ofcontroller.util.serializers.MACAddressSerializer;
 
-import org.codehaus.jackson.annotate.JsonProperty;
 import org.codehaus.jackson.map.annotate.JsonDeserialize;
 import org.codehaus.jackson.map.annotate.JsonSerialize;
 
diff --git a/src/main/java/net/onrc/onos/flow/FlowManagerImpl.java b/src/main/java/net/onrc/onos/flow/FlowManagerImpl.java
index dafbf32..9e69115 100644
--- a/src/main/java/net/onrc/onos/flow/FlowManagerImpl.java
+++ b/src/main/java/net/onrc/onos/flow/FlowManagerImpl.java
@@ -30,10 +30,8 @@
 import net.onrc.onos.ofcontroller.util.FlowPath;
 import net.onrc.onos.ofcontroller.util.Port;
 import net.onrc.onos.ofcontroller.util.SwitchPort;
-import net.onrc.onos.util.GraphDBConnection;
 import net.onrc.onos.util.GraphDBOperation;
 import net.onrc.onos.util.LocalTopologyEventListener;
-import net.onrc.onos.util.GraphDBConnection.Transaction;
 
 public class FlowManagerImpl implements IFlowManager {
 	
diff --git a/src/main/java/net/onrc/onos/flow/IFlowManager.java b/src/main/java/net/onrc/onos/flow/IFlowManager.java
index 4063a7a..598da85 100644
--- a/src/main/java/net/onrc/onos/flow/IFlowManager.java
+++ b/src/main/java/net/onrc/onos/flow/IFlowManager.java
@@ -1,7 +1,5 @@
 package net.onrc.onos.flow;
 
-import java.util.Map;
-
 import net.floodlightcontroller.core.IOFSwitch;
 import net.onrc.onos.ofcontroller.core.INetMapTopologyObjects.IPortObject;
 import net.onrc.onos.ofcontroller.util.FlowEntry;
diff --git a/src/main/java/net/onrc/onos/ofcontroller/bgproute/BgpRoute.java b/src/main/java/net/onrc/onos/ofcontroller/bgproute/BgpRoute.java
index 486d057..4b6e328 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/bgproute/BgpRoute.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/bgproute/BgpRoute.java
@@ -14,17 +14,19 @@
 
 import net.floodlightcontroller.core.IFloodlightProviderService;
 import net.floodlightcontroller.core.IOFSwitch;
+import net.floodlightcontroller.core.IOFSwitchListener;
 import net.floodlightcontroller.core.module.FloodlightModuleContext;
 import net.floodlightcontroller.core.module.FloodlightModuleException;
 import net.floodlightcontroller.core.module.IFloodlightModule;
 import net.floodlightcontroller.core.module.IFloodlightService;
 import net.floodlightcontroller.devicemanager.IDeviceService;
-import net.floodlightcontroller.linkdiscovery.ILinkDiscovery.LDUpdate;
 import net.floodlightcontroller.packet.Ethernet;
 import net.floodlightcontroller.restserver.IRestApiService;
 import net.floodlightcontroller.topology.ITopologyListener;
 import net.floodlightcontroller.topology.ITopologyService;
 import net.onrc.onos.ofcontroller.core.INetMapTopologyService.ITopoRouteService;
+import net.onrc.onos.ofcontroller.linkdiscovery.ILinkDiscovery;
+import net.onrc.onos.ofcontroller.linkdiscovery.ILinkDiscovery.LDUpdate;
 import net.onrc.onos.ofcontroller.util.DataPath;
 import net.onrc.onos.ofcontroller.util.FlowEntry;
 import net.onrc.onos.ofcontroller.util.Port;
@@ -36,7 +38,6 @@
 import org.codehaus.jackson.JsonParseException;
 import org.codehaus.jackson.map.JsonMappingException;
 import org.codehaus.jackson.map.ObjectMapper;
-import org.codehaus.jackson.type.TypeReference;
 import org.openflow.protocol.OFFlowMod;
 import org.openflow.protocol.OFMatch;
 import org.openflow.protocol.OFMessage;
@@ -45,12 +46,14 @@
 import org.openflow.protocol.action.OFAction;
 import org.openflow.protocol.action.OFActionDataLayerDestination;
 import org.openflow.protocol.action.OFActionOutput;
+import org.openflow.util.HexString;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 import com.google.common.net.InetAddresses;
 
-public class BgpRoute implements IFloodlightModule, IBgpRouteService, ITopologyListener {
+public class BgpRoute implements IFloodlightModule, IBgpRouteService, 
+									ITopologyListener, IOFSwitchListener {
 	
 	protected static Logger log = LoggerFactory.getLogger(BgpRoute.class);
 
@@ -79,16 +82,27 @@
 	protected final short SDNIP_PRIORITY = 10;
 	
 	protected Map<String, GatewayRouter> gatewayRouters;
+	protected List<String> switches;
+	
+	//True when all switches have connected
+	protected volatile boolean switchesConnected = false;
+	//True when we have a full mesh of shortest paths between gateways
+	protected volatile boolean topologyReady = false;
 	
 	private void readGatewaysConfiguration(String gatewaysFilename){
 		File gatewaysFile = new File(gatewaysFilename);
 		ObjectMapper mapper = new ObjectMapper();
 		
-		TypeReference<HashMap<String, GatewayRouter>> typeref 
-			= new TypeReference<HashMap<String, GatewayRouter>>() {};
-		
 		try {
-			gatewayRouters = mapper.readValue(gatewaysFile, typeref);
+			Configuration config = mapper.readValue(gatewaysFile, Configuration.class);
+			
+			gatewayRouters = config.getGateways();
+			switches = config.getSwitches();
+			
+			for (String sw : switches){
+				log.debug("Switchjoin {}", sw);
+			}
+			
 		} catch (JsonParseException e) {
 			log.error("Error in JSON file", e);
 			System.exit(1);
@@ -265,6 +279,18 @@
 
 	}
 	
+	private String getPrefixFromPtree(PtreeNode node){
+        InetAddress address = null;
+        try {
+			address = InetAddress.getByAddress(node.key);
+		} catch (UnknownHostException e1) {
+			//Should never happen is the reverse conversion has already been done
+			log.error("Malformed IP address");
+			return "";
+		}
+        return address.toString() + "/" + node.rib.masklen;
+	}
+	
 	private void retrieveRib(){
 		String url = "http://" + bgpdRestIp + "/wm/bgp/" + routerId;
 		String response = RestClient.get(url);
@@ -318,6 +344,15 @@
 	}
 	
 	public void prefixAdded(PtreeNode node) {
+		if (!topologyReady){
+			return;
+		}
+		
+		String prefix = getPrefixFromPtree(node);
+		
+		log.debug("New prefix {} added, next hop {}", 
+				prefix, node.rib.nextHop.toString());
+		
 		//Add a flow to rewrite mac for this prefix to all border switches
 		GatewayRouter thisRouter = gatewayRouters
 				.get(InetAddresses.toAddrString(node.rib.nextHop));
@@ -425,15 +460,88 @@
 	}
 	
 	public void prefixDeleted(PtreeNode node) {
-		//Remove MAC rewriting flows from other border switches
+		if (!topologyReady) {
+			return;
+		}
 		
+		String prefix = getPrefixFromPtree(node);
+		
+		log.debug("Prefix {} deleted, next hop {}", 
+				prefix, node.rib.nextHop.toString());
+		
+		//Remove MAC rewriting flows from other border switches
+		GatewayRouter thisRouter = gatewayRouters
+				.get(InetAddresses.toAddrString(node.rib.nextHop));
+		
+		for (GatewayRouter ingressRouter : gatewayRouters.values()){
+			if (ingressRouter == thisRouter) {
+				continue;
+			}
+			
+			//Set up the flow mod
+			OFFlowMod fm =
+	                (OFFlowMod) floodlightProvider.getOFMessageFactory()
+	                                              .getMessage(OFType.FLOW_MOD);
+			
+	        fm.setIdleTimeout((short)0)
+	        .setHardTimeout((short)0)
+	        .setBufferId(OFPacketOut.BUFFER_ID_NONE)
+	        .setCookie(MAC_RW_COOKIE)
+	        .setCommand(OFFlowMod.OFPFC_DELETE)
+	        //.setMatch(match)
+	        //.setActions(actions)
+	        .setPriority(SDNIP_PRIORITY)
+	        .setLengthU(OFFlowMod.MINIMUM_LENGTH);
+	        		//+ OFActionDataLayerDestination.MINIMUM_LENGTH
+	        		//+ OFActionOutput.MINIMUM_LENGTH);
+	        
+	        OFMatch match = new OFMatch();
+	        match.setDataLayerType(Ethernet.TYPE_IPv4);
+	        match.setWildcards(match.getWildcards() & ~OFMatch.OFPFW_DL_TYPE);
+	        
+	        match.setDataLayerSource(ingressRouter.getRouterMac().toBytes());
+	        match.setWildcards(match.getWildcards() & ~OFMatch.OFPFW_DL_SRC);
+	        
+	        //match.setDataLayerDestination(ingressRouter.getSdnRouterMac().toBytes());
+	        //match.setWildcards(match.getWildcards() & ~OFMatch.OFPFW_DL_DST);
+
+	        InetAddress address = null;
+	        try {
+				address = InetAddress.getByAddress(node.key);
+			} catch (UnknownHostException e1) {
+				//Should never happen is the reverse conversion has already been done
+				log.error("Malformed IP address");
+				return;
+			}
+	        
+	        match.setFromCIDR(address.getHostAddress() + "/" + node.rib.masklen, OFMatch.STR_NW_DST);
+	        fm.setMatch(match);
+	        
+	        //Write to switch
+	        IOFSwitch sw = floodlightProvider.getSwitches()
+	        		.get(ingressRouter.getAttachmentPoint().dpid().value());
+	        
+            if (sw == null){
+            	log.warn("Switch not found when pushing flow mod");
+            	continue;
+            }
+            
+            List<OFMessage> msglist = new ArrayList<OFMessage>();
+            msglist.add(fm);
+            try {
+				sw.write(msglist, null);
+				sw.flush();
+			} catch (IOException e) {
+				log.error("Failure writing flow mod", e);
+			}
+		}
 	}
 	
 	/*
 	 * On startup we need to calculate a full mesh of paths between all gateway
 	 * switches
 	 */
-	private void calculateFullMesh(){
+	private void setupFullMesh(){
 		Map<IOFSwitch, SwitchPort> gatewaySwitches = new HashMap<IOFSwitch, SwitchPort>();
 		
 		//have to account for switches not being there, paths not being found.
@@ -455,7 +563,6 @@
 			}
 			
 		}
-		log.debug("size {}", gatewaySwitches.size());
 		
 		//For each border router, calculate and install a path from every other
 		//border switch to said border router. However, don't install the entry
@@ -544,46 +651,118 @@
 		}
 	}
 	
+	
+	private void beginRouting(){
+		log.debug("Topology is now ready, beginning routing function");
+		
+		//traverse ptree and create flows for all routes
+		for (PtreeNode node = ptree.begin(); node != null; node = ptree.next(node)){
+			if (node.rib != null){
+				prefixAdded(node);
+			}
+		}
+	}
+	
+	private void checkSwitchesConnected(){
+		for (String dpid : switches){
+			if (floodlightProvider.getSwitches().get(HexString.toLong(dpid)) == null){
+				log.debug("Not all switches are here yet");
+				return;
+			}
+		}
+		switchesConnected = true;
+	}
+	
+	private void checkTopologyReady(){
+		for (GatewayRouter dstRouter : gatewayRouters.values()){
+			SwitchPort dstAttachmentPoint = dstRouter.getAttachmentPoint();
+			for (GatewayRouter srcRouter : gatewayRouters.values()) {
+				
+				if (dstRouter == srcRouter){
+					continue;
+				}
+				
+				SwitchPort srcAttachmentPoint = srcRouter.getAttachmentPoint();
+				
+				DataPath shortestPath = topoRouteService.getShortestPath(
+						srcAttachmentPoint, dstAttachmentPoint);
+				
+				if (shortestPath == null){
+					log.debug("Shortest path between {} and {} not found",
+							srcAttachmentPoint, dstAttachmentPoint);
+					return;
+				}
+			}
+		}
+		topologyReady = true;
+	}
+	
+	private void checkStatus(){
+		log.debug("In checkStatus, swC {}, toRe {}", switchesConnected, topologyReady);
+		
+		if (!switchesConnected){
+			checkSwitchesConnected();
+		}
+		boolean oldTopologyReadyStatus = topologyReady;
+		if (switchesConnected && !topologyReady){
+			checkTopologyReady();
+		}
+		if (!oldTopologyReadyStatus && topologyReady){
+			beginRouting();
+		}
+	}
+	
 	@Override
 	public void startUp(FloodlightModuleContext context) {
 		restApi.addRestletRoutable(new BgpRouteWebRoutable());
+		floodlightProvider.addOFSwitchListener(this);
 		topology.addListener(this);
 		
 		//Retrieve the RIB from BGPd during startup
 		retrieveRib();
-		
-		//Don't have to do this as we'll never have switches connected here
-		//calculateFullMesh();
 	}
 
 	@Override
-	public void topologyChanged() {
-		//Probably need to look at all changes, not just port changes
-		/*
-		boolean change = false;
-		String changelog = "";
+	public void topologyChanged() {		
+		//There seems to be more topology events than there should be. Lots of link
+		//updated, port up and switch updated on what should be a fairly static topology
 		
-		for (LDUpdate ldu : topology.getLastLinkUpdates()) {
-			if (ldu.getOperation().equals(ILinkDiscovery.UpdateOperation.PORT_DOWN)) {
-				change = true;
-				changelog = changelog + " down ";
-			} else if (ldu.getOperation().equals(ILinkDiscovery.UpdateOperation.PORT_UP)) {
-				change = true;
-				changelog = changelog + " up ";
+		boolean refreshNeeded = false;
+		for (LDUpdate ldu : topology.getLastLinkUpdates()){
+			if (!ldu.getOperation().equals(ILinkDiscovery.UpdateOperation.LINK_UPDATED)){
+				//We don't need to recalculate anything for just link updates
+				//They happen way too frequently (may be a bug in our link discovery)
+				refreshNeeded = true;
+			}
+			log.debug("Topo change {}", ldu.getOperation());
+		}
+		
+		if (refreshNeeded){
+			if (topologyReady){
+				setupFullMesh();
+			}
+			else{
+				checkStatus();
 			}
 		}
-		log.info ("received topo change" + changelog);
+	}
 
-		if (change) {
-			//RestClient.get ("http://localhost:5000/topo_change");
-		}
-		*/
-		
-		for (LDUpdate update : topology.getLastLinkUpdates()){
-			log.debug("{} event causing internal L2 path recalculation",
-					update.getOperation().toString());
-			
-		}
-		calculateFullMesh();
+	//TODO determine whether we need to listen for switch joins
+	@Override
+	public void addedSwitch(IOFSwitch sw) {
+		//checkStatus();
+	}
+
+	@Override
+	public void removedSwitch(IOFSwitch sw) {
+		// TODO Auto-generated method stub	
+	}
+
+	@Override
+	public void switchPortChanged(Long switchId) {}
+
+	@Override
+	public String getName() {
+		return "BgpRoute";
 	}
 }
diff --git a/src/main/java/net/onrc/onos/ofcontroller/bgproute/BgpRouteResource.java b/src/main/java/net/onrc/onos/ofcontroller/bgproute/BgpRouteResource.java
index 34c5c43b..8355308 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/bgproute/BgpRouteResource.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/bgproute/BgpRouteResource.java
@@ -184,6 +184,16 @@
 			}
 
 			PtreeNode node = ptree.lookup(p.getAddress(), p.masklen);
+			
+			//Remove the flows from the switches before the rib is lost
+			//Theory: we could get a delete for a prefix not in the Ptree.
+			//This would result in a null node being returned. We could get a delete for
+			//a node that's not actually there, but is a aggregate node. This would result
+			//in a non-null node with a null rib. Only a non-null node with a non-null
+			//rib is an actual prefix in the Ptree.
+			if (node != null && node.rib != null){
+				bgpRoute.prefixDeleted(node);
+			}
 
 			Rib r = new Rib(routerId, nextHop, p.masklen);
 
@@ -193,8 +203,6 @@
 					ptree.delReference(node);					
 				}
 			}
-
-			bgpRoute.prefixDeleted(node);
 			
 			reply =reply + "[DELE: " + prefix + "/" + mask + ":" + nextHop + "]";
 		}
diff --git a/src/main/java/net/onrc/onos/ofcontroller/bgproute/Configuration.java b/src/main/java/net/onrc/onos/ofcontroller/bgproute/Configuration.java
new file mode 100644
index 0000000..5194584
--- /dev/null
+++ b/src/main/java/net/onrc/onos/ofcontroller/bgproute/Configuration.java
@@ -0,0 +1,34 @@
+package net.onrc.onos.ofcontroller.bgproute;
+
+import java.util.List;
+import java.util.Map;
+
+import org.codehaus.jackson.annotate.JsonProperty;
+
+public class Configuration {
+	List<String> switches;
+	Map<String, GatewayRouter> gateways;
+	
+	public Configuration() {
+		// TODO Auto-generated constructor stub
+	}
+
+	public List<String> getSwitches() {
+		return switches;
+	}
+
+	@JsonProperty("switches")
+	public void setSwitches(List<String> switches) {
+		this.switches = switches;
+	}
+
+	public Map<String, GatewayRouter> getGateways() {
+		return gateways;
+	}
+
+	@JsonProperty("gateways")
+	public void setGateways(Map<String, GatewayRouter> gateways) {
+		this.gateways = gateways;
+	}
+
+}
diff --git a/src/main/java/net/onrc/onos/ofcontroller/devicemanager/IDeviceStorage.java b/src/main/java/net/onrc/onos/ofcontroller/core/IDeviceStorage.java
similarity index 83%
rename from src/main/java/net/onrc/onos/ofcontroller/devicemanager/IDeviceStorage.java
rename to src/main/java/net/onrc/onos/ofcontroller/core/IDeviceStorage.java
index d4355c6..7310d8c 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/devicemanager/IDeviceStorage.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/core/IDeviceStorage.java
@@ -1,7 +1,6 @@
-package net.onrc.onos.ofcontroller.devicemanager;
+package net.onrc.onos.ofcontroller.core;
 
 import net.floodlightcontroller.devicemanager.IDevice;
-import net.onrc.onos.ofcontroller.core.INetMapStorage;
 import net.onrc.onos.ofcontroller.core.INetMapTopologyObjects.IDeviceObject;
 
 public interface IDeviceStorage extends INetMapStorage {
diff --git a/src/main/java/net/onrc/onos/ofcontroller/linkdiscovery/ILinkStorage.java b/src/main/java/net/onrc/onos/ofcontroller/core/ILinkStorage.java
similarity index 88%
rename from src/main/java/net/onrc/onos/ofcontroller/linkdiscovery/ILinkStorage.java
rename to src/main/java/net/onrc/onos/ofcontroller/core/ILinkStorage.java
index 5150668..b56cfef 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/linkdiscovery/ILinkStorage.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/core/ILinkStorage.java
@@ -1,10 +1,9 @@
-package net.onrc.onos.ofcontroller.linkdiscovery;
+package net.onrc.onos.ofcontroller.core;
 
 import java.util.List;
 
-import net.floodlightcontroller.linkdiscovery.LinkInfo;
 import net.floodlightcontroller.routing.Link;
-import net.onrc.onos.ofcontroller.core.INetMapStorage;
+import net.onrc.onos.ofcontroller.linkdiscovery.LinkInfo;
 
 public interface ILinkStorage extends INetMapStorage {
 	
diff --git a/src/main/java/net/onrc/onos/ofcontroller/core/INetMapTopologyObjects.java b/src/main/java/net/onrc/onos/ofcontroller/core/INetMapTopologyObjects.java
index 3cfa190..fc1c32f 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/core/INetMapTopologyObjects.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/core/INetMapTopologyObjects.java
@@ -1,7 +1,6 @@
 package net.onrc.onos.ofcontroller.core;
 
-import net.onrc.onos.ofcontroller.core.INetMapTopologyObjects.IPortObject;
-import net.onrc.onos.ofcontroller.flowcache.web.DatapathSummarySerializer;
+import net.onrc.onos.ofcontroller.flowmanager.web.DatapathSummarySerializer;
 
 import org.codehaus.jackson.annotate.JsonIgnore;
 import org.codehaus.jackson.annotate.JsonProperty;
@@ -49,7 +48,7 @@
 
 // Requires Frames 2.3.0		
 		@JsonIgnore
-		@GremlinGroovy("_().out('on').has('number',port_num)")
+		@GremlinGroovy("it.out('on').has('number',port_num)")
 		public IPortObject getPort(@GremlinParam("port_num") final short port_num);
 		
 		@Adjacency(label="on")
@@ -59,7 +58,7 @@
 		public void removePort(final IPortObject port);
 		
 		@JsonIgnore
-		@GremlinGroovy("_().out('on').out('host')")
+		@GremlinGroovy("it.out('on').out('host')")
 		public Iterable<IDeviceObject> getDevices();
 		
 		@JsonIgnore
@@ -92,6 +91,7 @@
 		public void setPortState(Integer s);
 		
 		@JsonIgnore
+//		@GremlinGroovy("it.in('on')")
 		@Adjacency(label="on",direction = Direction.IN)
 		public ISwitchObject getSwitch();
 				
@@ -155,7 +155,7 @@
 		public void removeHostPort(final IPortObject port);
 		
 		@JsonIgnore
-		@GremlinGroovy("_().in('host').in('on')")
+		@GremlinGroovy("it.in('host').in('on')")
 		public Iterable<ISwitchObject> getSwitch();
 		
 /*		@JsonProperty("dpid")
@@ -268,7 +268,7 @@
 		public void setMatchDstIPv4Net(String matchDstIPv4Net);
 		
 		@JsonIgnore
-		@GremlinGroovy("_().in('flow').out('switch')")
+		@GremlinGroovy("it.in('flow').out('switch')")
 		public Iterable<ISwitchObject> getSwitches();
 		
 		@JsonIgnore
diff --git a/src/main/java/net/onrc/onos/ofcontroller/core/IOFSwitchPortListener.java b/src/main/java/net/onrc/onos/ofcontroller/core/IOFSwitchPortListener.java
new file mode 100644
index 0000000..5deae69
--- /dev/null
+++ b/src/main/java/net/onrc/onos/ofcontroller/core/IOFSwitchPortListener.java
@@ -0,0 +1,26 @@
+/**
+ * 
+ */
+package net.onrc.onos.ofcontroller.core;
+
+import org.openflow.protocol.OFPhysicalPort;
+
+import net.floodlightcontroller.core.IOFSwitchListener;
+
+/**
+ * @author y-higuchi
+ *
+ */
+public interface IOFSwitchPortListener extends IOFSwitchListener {
+
+	/**
+	 * Fired when ports on a switch area added
+	 */
+	public void switchPortAdded(Long switchId, OFPhysicalPort port);
+
+	/**
+	 * Fired when ports on a switch area removed
+	 */
+	public void switchPortRemoved(Long switchId, OFPhysicalPort port);
+
+}
diff --git a/src/main/java/net/onrc/onos/ofcontroller/core/IOnosRemoteSwitch.java b/src/main/java/net/onrc/onos/ofcontroller/core/IOnosRemoteSwitch.java
new file mode 100644
index 0000000..c9b0e2f
--- /dev/null
+++ b/src/main/java/net/onrc/onos/ofcontroller/core/IOnosRemoteSwitch.java
@@ -0,0 +1,20 @@
+/**
+ * 
+ */
+package net.onrc.onos.ofcontroller.core;
+
+import net.floodlightcontroller.core.IOFSwitch;
+
+/**
+ * @author y-higuchi
+ *
+ */
+public interface IOnosRemoteSwitch extends IOFSwitch {
+
+	/**
+	 * Setup an unconnected switch with the info required.
+	 * @param dpid of the switch
+	 */
+	public void setupRemoteSwitch(Long dpid);
+
+}
diff --git a/src/main/java/net/floodlightcontroller/core/Main.java b/src/main/java/net/onrc/onos/ofcontroller/core/Main.java
similarity index 92%
rename from src/main/java/net/floodlightcontroller/core/Main.java
rename to src/main/java/net/onrc/onos/ofcontroller/core/Main.java
index 91b317a..a80ac36 100644
--- a/src/main/java/net/floodlightcontroller/core/Main.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/core/Main.java
@@ -1,8 +1,9 @@
-package net.floodlightcontroller.core;
+package net.onrc.onos.ofcontroller.core;
 
 import org.kohsuke.args4j.CmdLineException;
 import org.kohsuke.args4j.CmdLineParser;
 
+import net.floodlightcontroller.core.IFloodlightProviderService;
 import net.floodlightcontroller.core.internal.CmdLineSettings;
 import net.floodlightcontroller.core.module.FloodlightModuleException;
 import net.floodlightcontroller.core.module.FloodlightModuleLoader;
@@ -10,7 +11,7 @@
 import net.floodlightcontroller.restserver.IRestApiService;
 
 /**
- * Host for the Floodlight main method
+ * Host for the ONOS main method
  * @author alexreimers
  */
 public class Main {
diff --git a/src/main/java/net/onrc/onos/ofcontroller/devicemanager/internal/DeviceStorageImpl.java b/src/main/java/net/onrc/onos/ofcontroller/core/internal/DeviceStorageImpl.java
similarity index 95%
rename from src/main/java/net/onrc/onos/ofcontroller/devicemanager/internal/DeviceStorageImpl.java
rename to src/main/java/net/onrc/onos/ofcontroller/core/internal/DeviceStorageImpl.java
index 98b4a88..dcb28ce 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/devicemanager/internal/DeviceStorageImpl.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/core/internal/DeviceStorageImpl.java
@@ -1,4 +1,4 @@
-package net.onrc.onos.ofcontroller.devicemanager.internal;
+package net.onrc.onos.ofcontroller.core.internal;
 
 import java.util.ArrayList;
 import java.util.List;
@@ -11,12 +11,10 @@
 import net.floodlightcontroller.devicemanager.IDevice;
 import net.floodlightcontroller.devicemanager.SwitchPort;
 import net.floodlightcontroller.packet.IPv4;
+import net.onrc.onos.ofcontroller.core.IDeviceStorage;
 import net.onrc.onos.ofcontroller.core.INetMapTopologyObjects.IDeviceObject;
 import net.onrc.onos.ofcontroller.core.INetMapTopologyObjects.IPortObject;
 import net.onrc.onos.ofcontroller.core.internal.SwitchStorageImpl;
-import net.onrc.onos.ofcontroller.devicemanager.IDeviceStorage;
-import net.onrc.onos.util.GraphDBConnection;
-import net.onrc.onos.util.GraphDBConnection.Transaction;
 import net.onrc.onos.util.GraphDBOperation;
 
 /**
@@ -25,7 +23,6 @@
  */
 public class DeviceStorageImpl implements IDeviceStorage {
 	
-	private GraphDBConnection conn;
 	private GraphDBOperation ope;
 	protected static Logger log = LoggerFactory.getLogger(SwitchStorageImpl.class);
 
@@ -36,10 +33,7 @@
 	@Override
 	public void init(String conf) {
 		try{
-			if((conn = GraphDBConnection.getInstance(conf)) != null)
-			{
-				ope = new GraphDBOperation(conn);
-			}
+			ope = new GraphDBOperation(conf);
 		} catch(Exception e) {
 			log.error(e.getMessage());
 		}
@@ -51,7 +45,7 @@
 	 */
 	@Override
 	public void close() {
-		conn.close();
+		ope.close();
 	}
 	
 	/***
diff --git a/src/main/java/net/floodlightcontroller/linkdiscovery/internal/LinkStorageImpl.java b/src/main/java/net/onrc/onos/ofcontroller/core/internal/LinkStorageImpl.java
similarity index 62%
rename from src/main/java/net/floodlightcontroller/linkdiscovery/internal/LinkStorageImpl.java
rename to src/main/java/net/onrc/onos/ofcontroller/core/internal/LinkStorageImpl.java
index f8f50a3..b33591e 100644
--- a/src/main/java/net/floodlightcontroller/linkdiscovery/internal/LinkStorageImpl.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/core/internal/LinkStorageImpl.java
@@ -1,14 +1,13 @@
-package net.floodlightcontroller.linkdiscovery.internal;
+package net.onrc.onos.ofcontroller.core.internal;
 
 import java.util.ArrayList;
 import java.util.List;
 
-import net.floodlightcontroller.linkdiscovery.LinkInfo;
 import net.floodlightcontroller.routing.Link;
+import net.onrc.onos.ofcontroller.core.ILinkStorage;
 import net.onrc.onos.ofcontroller.core.INetMapTopologyObjects.IPortObject;
 import net.onrc.onos.ofcontroller.core.INetMapTopologyObjects.ISwitchObject;
-import net.onrc.onos.ofcontroller.linkdiscovery.ILinkStorage;
-import net.onrc.onos.util.GraphDBConnection;
+import net.onrc.onos.ofcontroller.linkdiscovery.LinkInfo;
 import net.onrc.onos.util.GraphDBOperation;
 
 import org.openflow.util.HexString;
@@ -28,11 +27,21 @@
 	protected static Logger log = LoggerFactory.getLogger(LinkStorageImpl.class);
 	protected GraphDBOperation dbop;
 
+	/**
+	 * Update a record in the LinkStorage in a way provided by op.
+	 * @param link Record of a link to be updated.
+	 * @param op Operation to be done.
+	 */
 	@Override
 	public void update(Link link, DM_OPERATION op) {
 		update(link, (LinkInfo)null, op);
 	}
 
+	/**
+	 * Update multiple records in the LinkStorage in a way provided by op.
+	 * @param links List of records to be updated.
+	 * @param op Operation to be done.
+	 */
 	@Override
 	public void update(List<Link> links, DM_OPERATION op) {
 		for (Link lt: links) {
@@ -40,6 +49,12 @@
 		}
 	}
 
+	/**
+	 * Update a record of link with meta-information in the LinkStorage in a way provided by op.
+	 * @param link Record of a link to update.
+	 * @param linkinfo Meta-information of a link to be updated.
+	 * @param op Operation to be done.
+	 */
 	@Override
 	public void update(Link link, LinkInfo linkinfo, DM_OPERATION op) {
 		switch (op) {
@@ -54,6 +69,12 @@
 		}
 	}
 	
+	/**
+	 * Perform INSERT/CREATE/UPDATE operation to update the LinkStorage.
+	 * @param lt Record of a link to be updated.
+	 * @param linkinfo Meta-information of a link to be updated.
+	 * @param op Operation to be done. (only INSERT/CREATE/UPDATE is acceptable)
+	 */
 	public void updateLink(Link lt, LinkInfo linkinfo, DM_OPERATION op) {
 		IPortObject vportSrc = null, vportDst = null;
 	
@@ -71,7 +92,6 @@
             vportDst = dbop.searchPort(dpid, port);
                         
             if (vportSrc != null && vportDst != null) {
-         	       	
             	// check if the link exists
             	
             	Iterable<IPortObject> currPorts = vportSrc.getLinkedPorts();
@@ -79,7 +99,7 @@
             	for (IPortObject V : currPorts) {
             		currLinks.add(V);
             	}
-            	
+
             	if (currLinks.contains(vportDst)) {
             		// TODO: update linkinfo
             		if (op.equals(DM_OPERATION.INSERT) || op.equals(DM_OPERATION.CREATE)) {
@@ -105,6 +125,10 @@
         }
 	}
 	
+	/**
+	 * Delete multiple records in the LinkStorage.
+	 * @param links List of records to be deleted.
+	 */
 	@Override
 	public void deleteLinks(List<Link> links) {
 
@@ -113,7 +137,10 @@
 		}
 	}
 	
-
+	/**
+	 * Delete a record in the LinkStorage.
+	 * @param link Record to be deleted.
+	 */
 	@Override
 	public void deleteLink(Link lt) {
 		IPortObject vportSrc = null, vportDst = null;
@@ -163,66 +190,118 @@
         }
 	}
 
+	/**
+	 * Get list of all links connected to the port specified by given DPID and port number.
+	 * @param dpid DPID of desired port.
+	 * @param port Port number of desired port.
+	 * @return List of links. Empty list if no port was found.
+	 */
 	// TODO: Fix me
 	@Override
 	public List<Link> getLinks(Long dpid, short port) {
-		IPortObject vportSrc, vportDst;
-    	List<Link> links = null;
-    	Link lt;
+    	List<Link> links = new ArrayList<Link>();
     	
-		vportSrc = dbop.searchPort(HexString.toHexString(dpid), port);
-		if (vportSrc != null) {
-			
-     		for (Edge e : vportSrc.asVertex().getEdges(Direction.OUT)) {
-     			if (e.getLabel().equals("link")) {
-     				break;
-     			}
-     		}
-		}
-     	return null;
+    	IPortObject srcPort = dbop.searchPort(HexString.toHexString(dpid), port);
+    	ISwitchObject srcSw = srcPort.getSwitch();
+    	
+    	if(srcSw != null) {
+        	for(IPortObject dstPort : srcPort.getLinkedPorts()) {
+        		ISwitchObject dstSw = dstPort.getSwitch();
+        		Link link = new Link(HexString.toLong(srcSw.getDPID()),
+        				srcPort.getNumber(),
+        				HexString.toLong(dstSw.getDPID()),
+        				dstPort.getNumber());
+    		
+        		links.add(link);
+        	}
+    	}
+    	
+     	return links;
 	}
 	
+	/**
+	 * Initialize the object. Open LinkStorage using given configuration file.
+	 * @param conf Path (absolute path for now) to configuration file.
+	 */
 	@Override
 	public void init(String conf) {
 		//TODO extract the DB location from properties
-		this.dbop = new GraphDBOperation(GraphDBConnection.getInstance(conf));
+		this.dbop = new GraphDBOperation(conf);
 	}
 
+	/**
+	 * Delete records of the links connected to the port specified by given DPID and port number.
+	 * @param dpid DPID of desired port.
+	 * @param port Port number of desired port.
+	 */
+	// TODO: Fix me
 	@Override
 	public void deleteLinksOnPort(Long dpid, short port) {
-		// TODO Auto-generated method stub
+		List<Link> linksToDelete = getLinks(dpid,port);
 		
+		for(Link l : linksToDelete) {
+			deleteLink(l);
+		}
 	}
 
+	/**
+	 * Get list of all links connected to the switch specified by given DPID.
+	 * @param dpid DPID of desired switch.
+	 * @return List of links. Empty list if no port was found.
+	 */
+	// TODO: Fix me
 	@Override
 	public List<Link> getLinks(String dpid) {
-		// TODO Auto-generated method stub
-		return null;
+		List<Link> links = new ArrayList<Link>();
+
+		ISwitchObject srcSw = dbop.searchSwitch(dpid);
+		
+		if(srcSw != null) {
+			for(IPortObject srcPort : srcSw.getPorts()) {
+				for(IPortObject dstPort : srcPort.getLinkedPorts()) {
+					ISwitchObject dstSw = dstPort.getSwitch();
+					if(dstSw != null) {
+		        		Link link = new Link(HexString.toLong(srcSw.getDPID()),
+		        				srcPort.getNumber(),
+		        				HexString.toLong(dstSw.getDPID()),
+		        				dstPort.getNumber());
+		        		links.add(link);
+					}
+				}
+			}
+		}
+		
+		return links;
 	}
 
+	/**
+	 * Get list of all links whose state is ACTIVE.
+	 * @return List of active links. Empty list if no port was found.
+	 */
 	public List<Link> getActiveLinks() {
 		Iterable<ISwitchObject> switches = dbop.getActiveSwitches();
 
 		List<Link> links = new ArrayList<Link>(); 
-		for (ISwitchObject sw : switches) {
-			GremlinPipeline<Vertex, Link> pipe = new GremlinPipeline<Vertex, Link>();
-			ExtractLink extractor = new ExtractLink();
-
-			pipe.start(sw.asVertex());
-			pipe.enablePath(true);
-			pipe.out("on").out("link").in("on").path().step(extractor);
+		
+		for (ISwitchObject srcSw : switches) {
+			for(IPortObject srcPort : srcSw.getPorts()) {
+				for(IPortObject dstPort : srcPort.getLinkedPorts()) {
+					ISwitchObject dstSw = dstPort.getSwitch();
 					
-			while (pipe.hasNext() ) {
-				Link l = pipe.next();
-				links.add(l);
+					if(dstSw != null && dstSw.getState().equals("ACTIVE")) {
+						links.add(new Link(HexString.toLong(srcSw.getDPID()),
+								srcPort.getNumber(),
+								HexString.toLong(dstSw.getDPID()),
+								dstPort.getNumber()));
+					}
+				}
 			}
-						
 		}
+		
 		return links;
 	}
 	
-	// FIXME Scope changed to public to allow access from TopoLinkServiceImpl. Move class definition to appropriate place.
-	static public class ExtractLink implements PipeFunction<PathPipe<Vertex>, Link> {
+	static class ExtractLink implements PipeFunction<PathPipe<Vertex>, Link> {
 	
 		@Override
 		public Link compute(PathPipe<Vertex> pipe ) {
@@ -248,10 +327,16 @@
 		}
 	}
 	
+	/**
+	 * Finalize the object.
+	 */
 	public void finalize() {
 		close();
 	}
 
+	/**
+	 * Close LinkStorage.
+	 */
 	@Override
 	public void close() {
 		// TODO Auto-generated method stub
diff --git a/src/main/java/net/onrc/onos/ofcontroller/core/internal/SwitchStorageImpl.java b/src/main/java/net/onrc/onos/ofcontroller/core/internal/SwitchStorageImpl.java
index ec0c993..b12ccfa 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/core/internal/SwitchStorageImpl.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/core/internal/SwitchStorageImpl.java
@@ -207,4 +207,4 @@
 			log.info("SwitchStorage:deletePort dpid:{} port:{} failed", dpid, port);
 		}	
 	}
-}
+}
\ No newline at end of file
diff --git a/src/main/java/net/onrc/onos/ofcontroller/linkdiscovery/internal/TopoLinkServiceImpl.java b/src/main/java/net/onrc/onos/ofcontroller/core/internal/TopoLinkServiceImpl.java
similarity index 83%
rename from src/main/java/net/onrc/onos/ofcontroller/linkdiscovery/internal/TopoLinkServiceImpl.java
rename to src/main/java/net/onrc/onos/ofcontroller/core/internal/TopoLinkServiceImpl.java
index 1fe12c4..1222ff3 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/linkdiscovery/internal/TopoLinkServiceImpl.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/core/internal/TopoLinkServiceImpl.java
@@ -1,14 +1,12 @@
-package net.onrc.onos.ofcontroller.linkdiscovery.internal;
+package net.onrc.onos.ofcontroller.core.internal;
 
 import java.util.ArrayList;
 import java.util.List;
 
-import net.floodlightcontroller.linkdiscovery.internal.LinkStorageImpl;
-import net.floodlightcontroller.linkdiscovery.internal.LinkStorageImpl.ExtractLink;
 import net.floodlightcontroller.routing.Link;
 import net.onrc.onos.ofcontroller.core.INetMapTopologyObjects.ISwitchObject;
 import net.onrc.onos.ofcontroller.core.INetMapTopologyService.ITopoLinkService;
-import net.onrc.onos.util.GraphDBConnection;
+import net.onrc.onos.ofcontroller.core.internal.LinkStorageImpl.ExtractLink;
 import net.onrc.onos.util.GraphDBOperation;
 
 import org.slf4j.Logger;
@@ -34,8 +32,8 @@
 	@Override
 	public List<Link> getActiveLinks() {
 		// TODO Auto-generated method stub
-		op = new GraphDBOperation(GraphDBConnection.getInstance(""));
-		op.close(); //Commit to ensure we see latest data
+		op = new GraphDBOperation("");
+		op.commit(); //Commit to ensure we see latest data
 		Iterable<ISwitchObject> switches = op.getActiveSwitches();
 		List<Link> links = new ArrayList<Link>(); 
 		for (ISwitchObject sw : switches) {
diff --git a/src/main/java/net/onrc/onos/ofcontroller/core/internal/TopoSwitchServiceImpl.java b/src/main/java/net/onrc/onos/ofcontroller/core/internal/TopoSwitchServiceImpl.java
index e279422..c1659fb 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/core/internal/TopoSwitchServiceImpl.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/core/internal/TopoSwitchServiceImpl.java
@@ -3,7 +3,6 @@
 import net.onrc.onos.ofcontroller.core.INetMapTopologyObjects.IPortObject;
 import net.onrc.onos.ofcontroller.core.INetMapTopologyObjects.ISwitchObject;
 import net.onrc.onos.ofcontroller.core.INetMapTopologyService.ITopoSwitchService;
-import net.onrc.onos.util.GraphDBConnection;
 import net.onrc.onos.util.GraphDBOperation;
 
 import org.slf4j.Logger;
@@ -15,7 +14,7 @@
 	protected static Logger log = LoggerFactory.getLogger(TopoSwitchServiceImpl.class);
 
 	public TopoSwitchServiceImpl(String conf) {
-		op = new GraphDBOperation(GraphDBConnection.getInstance(conf));
+		op = new GraphDBOperation(conf);
 	}
 
 	public TopoSwitchServiceImpl() {
diff --git a/src/main/java/net/onrc/onos/ofcontroller/linkdiscovery/web/TopoLinksResource.java b/src/main/java/net/onrc/onos/ofcontroller/core/web/TopoLinksResource.java
similarity index 74%
rename from src/main/java/net/onrc/onos/ofcontroller/linkdiscovery/web/TopoLinksResource.java
rename to src/main/java/net/onrc/onos/ofcontroller/core/web/TopoLinksResource.java
index b692517..327c110 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/linkdiscovery/web/TopoLinksResource.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/core/web/TopoLinksResource.java
@@ -1,8 +1,8 @@
-package net.onrc.onos.ofcontroller.linkdiscovery.web;
+package net.onrc.onos.ofcontroller.core.web;
 
 import java.util.List;
 import net.floodlightcontroller.routing.Link;
-import net.onrc.onos.ofcontroller.linkdiscovery.internal.TopoLinkServiceImpl;
+import net.onrc.onos.ofcontroller.core.internal.TopoLinkServiceImpl;
 
 import org.restlet.resource.Get;
 import org.restlet.resource.ServerResource;
diff --git a/src/main/java/net/onrc/onos/ofcontroller/devicemanager/web/TopoDevicesResource.java b/src/main/java/net/onrc/onos/ofcontroller/devicemanager/web/TopoDevicesResource.java
index 1cd6b90..97ecfcc 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/devicemanager/web/TopoDevicesResource.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/devicemanager/web/TopoDevicesResource.java
@@ -3,7 +3,6 @@
 import java.util.Iterator;
 
 import net.onrc.onos.ofcontroller.core.INetMapTopologyObjects.IDeviceObject;
-import net.onrc.onos.util.GraphDBConnection;
 import net.onrc.onos.util.GraphDBOperation;
 
 import org.restlet.resource.Get;
@@ -13,12 +12,8 @@
 	
 	@Get("json")
 	public Iterator<IDeviceObject> retrieve() {
-		
-		GraphDBConnection conn = GraphDBConnection.getInstance("");
-		GraphDBOperation op = new GraphDBOperation(conn);
+		GraphDBOperation op = new GraphDBOperation("");
 		
 		return op.getDevices().iterator();
-		
 	}
-	
 }
diff --git a/src/main/java/net/onrc/onos/ofcontroller/onoslistener/OnosPublisher.java b/src/main/java/net/onrc/onos/ofcontroller/floodlightlistener/NetworkGraphPublisher.java
similarity index 90%
rename from src/main/java/net/onrc/onos/ofcontroller/onoslistener/OnosPublisher.java
rename to src/main/java/net/onrc/onos/ofcontroller/floodlightlistener/NetworkGraphPublisher.java
index 6a9d433..bb7318f 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/onoslistener/OnosPublisher.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/floodlightlistener/NetworkGraphPublisher.java
@@ -1,4 +1,4 @@
-package net.onrc.onos.ofcontroller.onoslistener;
+package net.onrc.onos.ofcontroller.floodlightlistener;
 
 import java.util.ArrayList;
 import java.util.Collection;
@@ -22,21 +22,20 @@
 import net.floodlightcontroller.devicemanager.IDevice;
 import net.floodlightcontroller.devicemanager.IDeviceListener;
 import net.floodlightcontroller.devicemanager.IDeviceService;
-import net.floodlightcontroller.linkdiscovery.ILinkDiscoveryListener;
-import net.floodlightcontroller.linkdiscovery.ILinkDiscoveryService;
-import net.floodlightcontroller.linkdiscovery.internal.LinkStorageImpl;
 import net.floodlightcontroller.routing.Link;
 import net.floodlightcontroller.threadpool.IThreadPoolService;
+import net.onrc.onos.ofcontroller.core.IDeviceStorage;
+import net.onrc.onos.ofcontroller.core.ILinkStorage;
+import net.onrc.onos.ofcontroller.core.IOFSwitchPortListener;
 import net.onrc.onos.ofcontroller.core.ISwitchStorage;
 import net.onrc.onos.ofcontroller.core.INetMapStorage.DM_OPERATION;
-import net.onrc.onos.ofcontroller.core.INetMapTopologyObjects.IPortObject;
 import net.onrc.onos.ofcontroller.core.INetMapTopologyObjects.ISwitchObject;
 import net.onrc.onos.ofcontroller.core.ISwitchStorage.SwitchState;
+import net.onrc.onos.ofcontroller.core.internal.DeviceStorageImpl;
+import net.onrc.onos.ofcontroller.core.internal.LinkStorageImpl;
 import net.onrc.onos.ofcontroller.core.internal.SwitchStorageImpl;
-import net.onrc.onos.ofcontroller.core.internal.TopoSwitchServiceImpl;
-import net.onrc.onos.ofcontroller.devicemanager.IDeviceStorage;
-import net.onrc.onos.ofcontroller.devicemanager.internal.DeviceStorageImpl;
-import net.onrc.onos.ofcontroller.linkdiscovery.ILinkStorage;
+import net.onrc.onos.ofcontroller.linkdiscovery.ILinkDiscoveryListener;
+import net.onrc.onos.ofcontroller.linkdiscovery.ILinkDiscoveryService;
 import net.onrc.onos.registry.controller.IControllerRegistryService;
 import net.onrc.onos.registry.controller.IControllerRegistryService.ControlChangeCallback;
 import net.onrc.onos.registry.controller.RegistryException;
@@ -45,7 +44,7 @@
 import net.onrc.onos.util.IDBConnection;
 import net.onrc.onos.util.LocalTopologyEventListener;
 
-public class OnosPublisher implements IDeviceListener, IOFSwitchListener,
+public class NetworkGraphPublisher implements IDeviceListener, IOFSwitchListener, IOFSwitchPortListener,
 		ILinkDiscoveryListener, IFloodlightModule {
 	
 	protected IDeviceStorage devStore;
@@ -189,7 +188,7 @@
 
 	@Override
 	public String getName() {
-		return "OnosPublisher";
+		return "NetworkGraphPublisher";
 	}
 
 	@Override
@@ -253,9 +252,9 @@
 		// TODO Auto-generated method stub
 		Map<String, String> configMap = context.getConfigParams(this);
 		String conf = configMap.get(DBConfigFile);
-		op = new GraphDBOperation(GraphDBConnection.getInstance(conf));
+		op = new GraphDBOperation(conf);
 		
-		log = LoggerFactory.getLogger(OnosPublisher.class);
+		log = LoggerFactory.getLogger(NetworkGraphPublisher.class);
 		floodlightProvider =
 	            context.getServiceImpl(IFloodlightProviderService.class);
 		deviceService = context.getServiceImpl(IDeviceService.class);
@@ -272,7 +271,7 @@
 		linkStore = new LinkStorageImpl();
 		linkStore.init(conf);
 				
-		log.debug("Initializing OnosPublisher module with {}", conf);
+		log.debug("Initializing NetworkGraphPublisher module with {}", conf);
 		
 	}
 
diff --git a/src/main/java/net/onrc/onos/ofcontroller/flowcache/FlowManager.java b/src/main/java/net/onrc/onos/ofcontroller/flowmanager/FlowManager.java
similarity index 99%
rename from src/main/java/net/onrc/onos/ofcontroller/flowcache/FlowManager.java
rename to src/main/java/net/onrc/onos/ofcontroller/flowmanager/FlowManager.java
index 125acf3..2dc230c 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/flowcache/FlowManager.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/flowmanager/FlowManager.java
@@ -1,4 +1,4 @@
-package net.onrc.onos.ofcontroller.flowcache;
+package net.onrc.onos.ofcontroller.flowmanager;
 
 import java.io.IOException;
 import java.io.PrintWriter;
@@ -33,7 +33,7 @@
 import net.onrc.onos.ofcontroller.core.INetMapTopologyObjects.IPortObject;
 import net.onrc.onos.ofcontroller.core.INetMapTopologyObjects.ISwitchObject;
 import net.onrc.onos.ofcontroller.core.INetMapTopologyService.ITopoRouteService;
-import net.onrc.onos.ofcontroller.flowcache.web.FlowWebRoutable;
+import net.onrc.onos.ofcontroller.flowmanager.web.FlowWebRoutable;
 import net.onrc.onos.ofcontroller.util.CallerId;
 import net.onrc.onos.ofcontroller.util.DataPath;
 import net.onrc.onos.ofcontroller.util.DataPathEndpoints;
@@ -49,7 +49,6 @@
 import net.onrc.onos.ofcontroller.util.IPv4Net;
 import net.onrc.onos.ofcontroller.util.Port;
 import net.onrc.onos.ofcontroller.util.SwitchPort;
-import net.onrc.onos.util.GraphDBConnection;
 import net.onrc.onos.util.GraphDBOperation;
 
 import org.openflow.protocol.OFFlowMod;
@@ -413,7 +412,7 @@
 
     @Override
     public void init(String conf) {
-    	op = new GraphDBOperation(GraphDBConnection.getInstance(conf));
+    	op = new GraphDBOperation(conf);
     }
 
     public void finalize() {
diff --git a/src/main/java/net/onrc/onos/ofcontroller/flowcache/IFlowService.java b/src/main/java/net/onrc/onos/ofcontroller/flowmanager/IFlowService.java
similarity index 98%
rename from src/main/java/net/onrc/onos/ofcontroller/flowcache/IFlowService.java
rename to src/main/java/net/onrc/onos/ofcontroller/flowmanager/IFlowService.java
index 06566d4..ba9cd1b 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/flowcache/IFlowService.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/flowmanager/IFlowService.java
@@ -1,4 +1,4 @@
-package net.onrc.onos.ofcontroller.flowcache;
+package net.onrc.onos.ofcontroller.flowmanager;
 
 import java.util.ArrayList;
 
diff --git a/src/main/java/net/onrc/onos/ofcontroller/flowcache/web/AddFlowResource.java b/src/main/java/net/onrc/onos/ofcontroller/flowmanager/web/AddFlowResource.java
similarity index 91%
rename from src/main/java/net/onrc/onos/ofcontroller/flowcache/web/AddFlowResource.java
rename to src/main/java/net/onrc/onos/ofcontroller/flowmanager/web/AddFlowResource.java
index 0763b8a..2800305 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/flowcache/web/AddFlowResource.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/flowmanager/web/AddFlowResource.java
@@ -1,15 +1,14 @@
-package net.onrc.onos.ofcontroller.flowcache.web;
+package net.onrc.onos.ofcontroller.flowmanager.web;
 
 import java.io.IOException;
 
-import net.onrc.onos.ofcontroller.flowcache.IFlowService;
+import net.onrc.onos.ofcontroller.flowmanager.IFlowService;
 import net.onrc.onos.ofcontroller.util.FlowId;
 import net.onrc.onos.ofcontroller.util.FlowPath;
 
 import org.codehaus.jackson.JsonGenerationException;
 import org.codehaus.jackson.map.ObjectMapper;
 import org.codehaus.jackson.map.JsonMappingException;
-import org.codehaus.jackson.map.ObjectMapper;
 import org.restlet.resource.Post;
 import org.restlet.resource.ServerResource;
 import org.slf4j.Logger;
diff --git a/src/main/java/net/onrc/onos/ofcontroller/flowcache/web/AddShortestPathFlowResource.java b/src/main/java/net/onrc/onos/ofcontroller/flowmanager/web/AddShortestPathFlowResource.java
similarity index 91%
rename from src/main/java/net/onrc/onos/ofcontroller/flowcache/web/AddShortestPathFlowResource.java
rename to src/main/java/net/onrc/onos/ofcontroller/flowmanager/web/AddShortestPathFlowResource.java
index 59a8972..9d2e0c9 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/flowcache/web/AddShortestPathFlowResource.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/flowmanager/web/AddShortestPathFlowResource.java
@@ -1,13 +1,12 @@
-package net.onrc.onos.ofcontroller.flowcache.web;
+package net.onrc.onos.ofcontroller.flowmanager.web;
 
 import java.io.IOException;
 
-import net.onrc.onos.ofcontroller.flowcache.IFlowService;
+import net.onrc.onos.ofcontroller.flowmanager.IFlowService;
 import net.onrc.onos.ofcontroller.util.FlowId;
 import net.onrc.onos.ofcontroller.util.FlowPath;
 
 import org.codehaus.jackson.JsonGenerationException;
-import org.codehaus.jackson.map.ObjectMapper;
 import org.codehaus.jackson.map.JsonMappingException;
 import org.codehaus.jackson.map.ObjectMapper;
 import org.restlet.resource.Post;
diff --git a/src/main/java/net/onrc/onos/ofcontroller/flowcache/web/ClearFlowResource.java b/src/main/java/net/onrc/onos/ofcontroller/flowmanager/web/ClearFlowResource.java
similarity index 87%
rename from src/main/java/net/onrc/onos/ofcontroller/flowcache/web/ClearFlowResource.java
rename to src/main/java/net/onrc/onos/ofcontroller/flowmanager/web/ClearFlowResource.java
index e51bc9d..1daa2ab 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/flowcache/web/ClearFlowResource.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/flowmanager/web/ClearFlowResource.java
@@ -1,9 +1,8 @@
-package net.onrc.onos.ofcontroller.flowcache.web;
+package net.onrc.onos.ofcontroller.flowmanager.web;
 
-import net.onrc.onos.ofcontroller.flowcache.IFlowService;
+import net.onrc.onos.ofcontroller.flowmanager.IFlowService;
 import net.onrc.onos.ofcontroller.util.FlowId;
 
-import org.openflow.util.HexString;
 import org.restlet.resource.Get;
 import org.restlet.resource.ServerResource;
 import org.slf4j.Logger;
diff --git a/src/main/java/net/onrc/onos/ofcontroller/flowcache/web/DatapathSummarySerializer.java b/src/main/java/net/onrc/onos/ofcontroller/flowmanager/web/DatapathSummarySerializer.java
similarity index 97%
rename from src/main/java/net/onrc/onos/ofcontroller/flowcache/web/DatapathSummarySerializer.java
rename to src/main/java/net/onrc/onos/ofcontroller/flowmanager/web/DatapathSummarySerializer.java
index 2022966..9133077 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/flowcache/web/DatapathSummarySerializer.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/flowmanager/web/DatapathSummarySerializer.java
@@ -1,4 +1,4 @@
-package net.onrc.onos.ofcontroller.flowcache.web;
+package net.onrc.onos.ofcontroller.flowmanager.web;
 
 import java.io.IOException;
 
diff --git a/src/main/java/net/onrc/onos/ofcontroller/flowcache/web/DeleteFlowResource.java b/src/main/java/net/onrc/onos/ofcontroller/flowmanager/web/DeleteFlowResource.java
similarity index 88%
rename from src/main/java/net/onrc/onos/ofcontroller/flowcache/web/DeleteFlowResource.java
rename to src/main/java/net/onrc/onos/ofcontroller/flowmanager/web/DeleteFlowResource.java
index fb3d100..393ff44 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/flowcache/web/DeleteFlowResource.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/flowmanager/web/DeleteFlowResource.java
@@ -1,9 +1,8 @@
-package net.onrc.onos.ofcontroller.flowcache.web;
+package net.onrc.onos.ofcontroller.flowmanager.web;
 
-import net.onrc.onos.ofcontroller.flowcache.IFlowService;
+import net.onrc.onos.ofcontroller.flowmanager.IFlowService;
 import net.onrc.onos.ofcontroller.util.FlowId;
 
-import org.openflow.util.HexString;
 import org.restlet.resource.Get;
 import org.restlet.resource.ServerResource;
 import org.slf4j.Logger;
diff --git a/src/main/java/net/onrc/onos/ofcontroller/flowcache/web/FlowWebRoutable.java b/src/main/java/net/onrc/onos/ofcontroller/flowmanager/web/FlowWebRoutable.java
similarity index 97%
rename from src/main/java/net/onrc/onos/ofcontroller/flowcache/web/FlowWebRoutable.java
rename to src/main/java/net/onrc/onos/ofcontroller/flowmanager/web/FlowWebRoutable.java
index a2a3e54..954c84d 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/flowcache/web/FlowWebRoutable.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/flowmanager/web/FlowWebRoutable.java
@@ -1,4 +1,4 @@
-package net.onrc.onos.ofcontroller.flowcache.web;
+package net.onrc.onos.ofcontroller.flowmanager.web;
 
 import net.floodlightcontroller.restserver.RestletRoutable;
 
diff --git a/src/main/java/net/onrc/onos/ofcontroller/flowcache/web/GetAllFlowsByEndpointsResource.java b/src/main/java/net/onrc/onos/ofcontroller/flowmanager/web/GetAllFlowsByEndpointsResource.java
similarity index 94%
rename from src/main/java/net/onrc/onos/ofcontroller/flowcache/web/GetAllFlowsByEndpointsResource.java
rename to src/main/java/net/onrc/onos/ofcontroller/flowmanager/web/GetAllFlowsByEndpointsResource.java
index c284a9c..6142096 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/flowcache/web/GetAllFlowsByEndpointsResource.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/flowmanager/web/GetAllFlowsByEndpointsResource.java
@@ -1,8 +1,8 @@
-package net.onrc.onos.ofcontroller.flowcache.web;
+package net.onrc.onos.ofcontroller.flowmanager.web;
 
 import java.util.ArrayList;
 
-import net.onrc.onos.ofcontroller.flowcache.IFlowService;
+import net.onrc.onos.ofcontroller.flowmanager.IFlowService;
 import net.onrc.onos.ofcontroller.util.DataPathEndpoints;
 import net.onrc.onos.ofcontroller.util.Dpid;
 import net.onrc.onos.ofcontroller.util.FlowPath;
diff --git a/src/main/java/net/onrc/onos/ofcontroller/flowcache/web/GetAllFlowsByInstallerIdResource.java b/src/main/java/net/onrc/onos/ofcontroller/flowmanager/web/GetAllFlowsByInstallerIdResource.java
similarity index 94%
rename from src/main/java/net/onrc/onos/ofcontroller/flowcache/web/GetAllFlowsByInstallerIdResource.java
rename to src/main/java/net/onrc/onos/ofcontroller/flowmanager/web/GetAllFlowsByInstallerIdResource.java
index 8247422..498108f 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/flowcache/web/GetAllFlowsByInstallerIdResource.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/flowmanager/web/GetAllFlowsByInstallerIdResource.java
@@ -1,8 +1,8 @@
-package net.onrc.onos.ofcontroller.flowcache.web;
+package net.onrc.onos.ofcontroller.flowmanager.web;
 
 import java.util.ArrayList;
 
-import net.onrc.onos.ofcontroller.flowcache.IFlowService;
+import net.onrc.onos.ofcontroller.flowmanager.IFlowService;
 import net.onrc.onos.ofcontroller.util.CallerId;
 import net.onrc.onos.ofcontroller.util.DataPathEndpoints;
 import net.onrc.onos.ofcontroller.util.Dpid;
diff --git a/src/main/java/net/onrc/onos/ofcontroller/flowcache/web/GetAllFlowsResource.java b/src/main/java/net/onrc/onos/ofcontroller/flowmanager/web/GetAllFlowsResource.java
similarity index 88%
rename from src/main/java/net/onrc/onos/ofcontroller/flowcache/web/GetAllFlowsResource.java
rename to src/main/java/net/onrc/onos/ofcontroller/flowmanager/web/GetAllFlowsResource.java
index 5ffbefa..61eaf27 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/flowcache/web/GetAllFlowsResource.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/flowmanager/web/GetAllFlowsResource.java
@@ -1,8 +1,8 @@
-package net.onrc.onos.ofcontroller.flowcache.web;
+package net.onrc.onos.ofcontroller.flowmanager.web;
 
 import java.util.ArrayList;
 
-import net.onrc.onos.ofcontroller.flowcache.IFlowService;
+import net.onrc.onos.ofcontroller.flowmanager.IFlowService;
 import net.onrc.onos.ofcontroller.util.FlowPath;
 
 import org.restlet.resource.Get;
diff --git a/src/main/java/net/onrc/onos/ofcontroller/flowcache/web/GetFlowByIdResource.java b/src/main/java/net/onrc/onos/ofcontroller/flowmanager/web/GetFlowByIdResource.java
similarity index 89%
rename from src/main/java/net/onrc/onos/ofcontroller/flowcache/web/GetFlowByIdResource.java
rename to src/main/java/net/onrc/onos/ofcontroller/flowmanager/web/GetFlowByIdResource.java
index 2f0f712..48e7369 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/flowcache/web/GetFlowByIdResource.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/flowmanager/web/GetFlowByIdResource.java
@@ -1,6 +1,6 @@
-package net.onrc.onos.ofcontroller.flowcache.web;
+package net.onrc.onos.ofcontroller.flowmanager.web;
 
-import net.onrc.onos.ofcontroller.flowcache.IFlowService;
+import net.onrc.onos.ofcontroller.flowmanager.IFlowService;
 import net.onrc.onos.ofcontroller.util.FlowId;
 import net.onrc.onos.ofcontroller.util.FlowPath;
 
diff --git a/src/main/java/net/onrc/onos/ofcontroller/flowcache/web/GetSummaryFlowsResource.java b/src/main/java/net/onrc/onos/ofcontroller/flowmanager/web/GetSummaryFlowsResource.java
similarity index 89%
rename from src/main/java/net/onrc/onos/ofcontroller/flowcache/web/GetSummaryFlowsResource.java
rename to src/main/java/net/onrc/onos/ofcontroller/flowmanager/web/GetSummaryFlowsResource.java
index 54c75f2..4b3c00f 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/flowcache/web/GetSummaryFlowsResource.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/flowmanager/web/GetSummaryFlowsResource.java
@@ -1,11 +1,10 @@
-package net.onrc.onos.ofcontroller.flowcache.web;
+package net.onrc.onos.ofcontroller.flowmanager.web;
 
 import java.util.ArrayList;
 
 import net.onrc.onos.ofcontroller.core.INetMapTopologyObjects.IFlowPath;
-import net.onrc.onos.ofcontroller.flowcache.IFlowService;
+import net.onrc.onos.ofcontroller.flowmanager.IFlowService;
 import net.onrc.onos.ofcontroller.util.FlowId;
-import net.onrc.onos.ofcontroller.util.FlowPath;
 
 import org.restlet.resource.Get;
 import org.restlet.resource.ServerResource;
diff --git a/src/main/java/net/onrc/onos/ofcontroller/flowcache/web/MeasurementClearAllPathsFlowResource.java b/src/main/java/net/onrc/onos/ofcontroller/flowmanager/web/MeasurementClearAllPathsFlowResource.java
similarity index 81%
rename from src/main/java/net/onrc/onos/ofcontroller/flowcache/web/MeasurementClearAllPathsFlowResource.java
rename to src/main/java/net/onrc/onos/ofcontroller/flowmanager/web/MeasurementClearAllPathsFlowResource.java
index d0c013e..07d9fb2 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/flowcache/web/MeasurementClearAllPathsFlowResource.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/flowmanager/web/MeasurementClearAllPathsFlowResource.java
@@ -1,9 +1,7 @@
-package net.onrc.onos.ofcontroller.flowcache.web;
+package net.onrc.onos.ofcontroller.flowmanager.web;
 
-import net.onrc.onos.ofcontroller.flowcache.IFlowService;
-import net.onrc.onos.ofcontroller.util.FlowId;
+import net.onrc.onos.ofcontroller.flowmanager.IFlowService;
 
-import org.openflow.util.HexString;
 import org.restlet.resource.Get;
 import org.restlet.resource.ServerResource;
 import org.slf4j.Logger;
diff --git a/src/main/java/net/onrc/onos/ofcontroller/flowcache/web/MeasurementGetInstallPathsTimeNsecFlowResource.java b/src/main/java/net/onrc/onos/ofcontroller/flowmanager/web/MeasurementGetInstallPathsTimeNsecFlowResource.java
similarity index 81%
rename from src/main/java/net/onrc/onos/ofcontroller/flowcache/web/MeasurementGetInstallPathsTimeNsecFlowResource.java
rename to src/main/java/net/onrc/onos/ofcontroller/flowmanager/web/MeasurementGetInstallPathsTimeNsecFlowResource.java
index 2d2fbf6..467afca 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/flowcache/web/MeasurementGetInstallPathsTimeNsecFlowResource.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/flowmanager/web/MeasurementGetInstallPathsTimeNsecFlowResource.java
@@ -1,9 +1,7 @@
-package net.onrc.onos.ofcontroller.flowcache.web;
+package net.onrc.onos.ofcontroller.flowmanager.web;
 
-import net.onrc.onos.ofcontroller.flowcache.IFlowService;
-import net.onrc.onos.ofcontroller.util.FlowId;
+import net.onrc.onos.ofcontroller.flowmanager.IFlowService;
 
-import org.openflow.util.HexString;
 import org.restlet.resource.Get;
 import org.restlet.resource.ServerResource;
 import org.slf4j.Logger;
diff --git a/src/main/java/net/onrc/onos/ofcontroller/flowcache/web/MeasurementGetPerFlowInstallTimeFlowResource.java b/src/main/java/net/onrc/onos/ofcontroller/flowmanager/web/MeasurementGetPerFlowInstallTimeFlowResource.java
similarity index 81%
rename from src/main/java/net/onrc/onos/ofcontroller/flowcache/web/MeasurementGetPerFlowInstallTimeFlowResource.java
rename to src/main/java/net/onrc/onos/ofcontroller/flowmanager/web/MeasurementGetPerFlowInstallTimeFlowResource.java
index 981c12c..92d84ab 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/flowcache/web/MeasurementGetPerFlowInstallTimeFlowResource.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/flowmanager/web/MeasurementGetPerFlowInstallTimeFlowResource.java
@@ -1,9 +1,7 @@
-package net.onrc.onos.ofcontroller.flowcache.web;
+package net.onrc.onos.ofcontroller.flowmanager.web;
 
-import net.onrc.onos.ofcontroller.flowcache.IFlowService;
-import net.onrc.onos.ofcontroller.util.FlowId;
+import net.onrc.onos.ofcontroller.flowmanager.IFlowService;
 
-import org.openflow.util.HexString;
 import org.restlet.resource.Get;
 import org.restlet.resource.ServerResource;
 import org.slf4j.Logger;
diff --git a/src/main/java/net/onrc/onos/ofcontroller/flowcache/web/MeasurementInstallPathsFlowResource.java b/src/main/java/net/onrc/onos/ofcontroller/flowmanager/web/MeasurementInstallPathsFlowResource.java
similarity index 83%
rename from src/main/java/net/onrc/onos/ofcontroller/flowcache/web/MeasurementInstallPathsFlowResource.java
rename to src/main/java/net/onrc/onos/ofcontroller/flowmanager/web/MeasurementInstallPathsFlowResource.java
index 911de89..074dfb4 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/flowcache/web/MeasurementInstallPathsFlowResource.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/flowmanager/web/MeasurementInstallPathsFlowResource.java
@@ -1,9 +1,7 @@
-package net.onrc.onos.ofcontroller.flowcache.web;
+package net.onrc.onos.ofcontroller.flowmanager.web;
 
-import net.onrc.onos.ofcontroller.flowcache.IFlowService;
-import net.onrc.onos.ofcontroller.util.FlowId;
+import net.onrc.onos.ofcontroller.flowmanager.IFlowService;
 
-import org.openflow.util.HexString;
 import org.restlet.resource.Get;
 import org.restlet.resource.ServerResource;
 import org.slf4j.Logger;
diff --git a/src/main/java/net/onrc/onos/ofcontroller/flowcache/web/MeasurementStorePathFlowResource.java b/src/main/java/net/onrc/onos/ofcontroller/flowmanager/web/MeasurementStorePathFlowResource.java
similarity index 91%
rename from src/main/java/net/onrc/onos/ofcontroller/flowcache/web/MeasurementStorePathFlowResource.java
rename to src/main/java/net/onrc/onos/ofcontroller/flowmanager/web/MeasurementStorePathFlowResource.java
index 5eb8af0..0f23663 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/flowcache/web/MeasurementStorePathFlowResource.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/flowmanager/web/MeasurementStorePathFlowResource.java
@@ -1,13 +1,12 @@
-package net.onrc.onos.ofcontroller.flowcache.web;
+package net.onrc.onos.ofcontroller.flowmanager.web;
 
 import java.io.IOException;
 
-import net.onrc.onos.ofcontroller.flowcache.IFlowService;
+import net.onrc.onos.ofcontroller.flowmanager.IFlowService;
 import net.onrc.onos.ofcontroller.util.FlowId;
 import net.onrc.onos.ofcontroller.util.FlowPath;
 
 import org.codehaus.jackson.JsonGenerationException;
-import org.codehaus.jackson.map.ObjectMapper;
 import org.codehaus.jackson.map.JsonMappingException;
 import org.codehaus.jackson.map.ObjectMapper;
 import org.restlet.resource.Post;
diff --git a/src/main/java/net/floodlightcontroller/linkdiscovery/ILinkDiscovery.java b/src/main/java/net/onrc/onos/ofcontroller/linkdiscovery/ILinkDiscovery.java
similarity index 96%
rename from src/main/java/net/floodlightcontroller/linkdiscovery/ILinkDiscovery.java
rename to src/main/java/net/onrc/onos/ofcontroller/linkdiscovery/ILinkDiscovery.java
index 1df7eb5..6113ea8 100644
--- a/src/main/java/net/floodlightcontroller/linkdiscovery/ILinkDiscovery.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/linkdiscovery/ILinkDiscovery.java
@@ -1,4 +1,4 @@
-package net.floodlightcontroller.linkdiscovery;
+package net.onrc.onos.ofcontroller.linkdiscovery;
 
 import org.codehaus.jackson.map.annotate.JsonSerialize;
 import org.codehaus.jackson.map.ser.std.ToStringSerializer;
@@ -8,7 +8,7 @@
 
     @JsonSerialize(using=ToStringSerializer.class)
     public enum UpdateOperation {
-    	LINK_ADDED("Link Added"),
+    	LINK_ADDED("Link Added"), // Operation Added by ONOS
         LINK_UPDATED("Link Updated"),
         LINK_REMOVED("Link Removed"),
         SWITCH_UPDATED("Switch Updated"),
@@ -107,6 +107,7 @@
         @Override
         public String toString() {
             switch (operation) {
+            case LINK_ADDED:
             case LINK_REMOVED:
             case LINK_UPDATED:
                 return "LDUpdate [operation=" + operation +
diff --git a/src/main/java/net/floodlightcontroller/linkdiscovery/ILinkDiscoveryListener.java b/src/main/java/net/onrc/onos/ofcontroller/linkdiscovery/ILinkDiscoveryListener.java
similarity index 94%
rename from src/main/java/net/floodlightcontroller/linkdiscovery/ILinkDiscoveryListener.java
rename to src/main/java/net/onrc/onos/ofcontroller/linkdiscovery/ILinkDiscoveryListener.java
index 35779a2..9ca114f 100644
--- a/src/main/java/net/floodlightcontroller/linkdiscovery/ILinkDiscoveryListener.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/linkdiscovery/ILinkDiscoveryListener.java
@@ -15,7 +15,7 @@
  *    under the License.
  **/
 
-package net.floodlightcontroller.linkdiscovery;
+package net.onrc.onos.ofcontroller.linkdiscovery;
 
 public interface ILinkDiscoveryListener extends ILinkDiscovery{
 
diff --git a/src/main/java/net/floodlightcontroller/linkdiscovery/ILinkDiscoveryService.java b/src/main/java/net/onrc/onos/ofcontroller/linkdiscovery/ILinkDiscoveryService.java
similarity index 97%
rename from src/main/java/net/floodlightcontroller/linkdiscovery/ILinkDiscoveryService.java
rename to src/main/java/net/onrc/onos/ofcontroller/linkdiscovery/ILinkDiscoveryService.java
index 4145592..99438ab 100644
--- a/src/main/java/net/floodlightcontroller/linkdiscovery/ILinkDiscoveryService.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/linkdiscovery/ILinkDiscoveryService.java
@@ -15,7 +15,7 @@
 *    under the License.
 **/
 
-package net.floodlightcontroller.linkdiscovery;
+package net.onrc.onos.ofcontroller.linkdiscovery;
 
 import java.util.Map;
 import java.util.Set;
diff --git a/src/main/java/net/floodlightcontroller/linkdiscovery/LinkInfo.java b/src/main/java/net/onrc/onos/ofcontroller/linkdiscovery/LinkInfo.java
similarity index 97%
rename from src/main/java/net/floodlightcontroller/linkdiscovery/LinkInfo.java
rename to src/main/java/net/onrc/onos/ofcontroller/linkdiscovery/LinkInfo.java
index 9c0dd1a..825b0a2 100644
--- a/src/main/java/net/floodlightcontroller/linkdiscovery/LinkInfo.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/linkdiscovery/LinkInfo.java
@@ -13,9 +13,9 @@
 *    under the License.
 **/
 
-package net.floodlightcontroller.linkdiscovery;
+package net.onrc.onos.ofcontroller.linkdiscovery;
 
-import net.floodlightcontroller.linkdiscovery.ILinkDiscovery.LinkType;
+import net.onrc.onos.ofcontroller.linkdiscovery.ILinkDiscovery.LinkType;
 
 import org.openflow.protocol.OFPhysicalPort.OFPortState;
 
diff --git a/src/main/java/net/onrc/onos/ofcontroller/linkdiscovery/README b/src/main/java/net/onrc/onos/ofcontroller/linkdiscovery/README
new file mode 100644
index 0000000..3cec58d
--- /dev/null
+++ b/src/main/java/net/onrc/onos/ofcontroller/linkdiscovery/README
@@ -0,0 +1,8 @@
+Note about this directory
+=========================
+
+This directory contains link discovery manager and it's related module derived from Flood Light v0.9.0.
+Many of the code is unmodified from it's original state, but they had to be moved due to package visibility etc.
+
+Compare with floodlight's linkdiscovery directory to see what was modified from it's original code.
+
diff --git a/src/main/java/net/floodlightcontroller/linkdiscovery/internal/EventHistoryTopologyCluster.java b/src/main/java/net/onrc/onos/ofcontroller/linkdiscovery/internal/EventHistoryTopologyCluster.java
similarity index 95%
rename from src/main/java/net/floodlightcontroller/linkdiscovery/internal/EventHistoryTopologyCluster.java
rename to src/main/java/net/onrc/onos/ofcontroller/linkdiscovery/internal/EventHistoryTopologyCluster.java
index d57e987..696c63e 100644
--- a/src/main/java/net/floodlightcontroller/linkdiscovery/internal/EventHistoryTopologyCluster.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/linkdiscovery/internal/EventHistoryTopologyCluster.java
@@ -1,4 +1,4 @@
-package net.floodlightcontroller.linkdiscovery.internal;
+package net.onrc.onos.ofcontroller.linkdiscovery.internal;
 
 import net.floodlightcontroller.core.web.serializers.DPIDSerializer;
 
diff --git a/src/main/java/net/floodlightcontroller/linkdiscovery/internal/EventHistoryTopologyLink.java b/src/main/java/net/onrc/onos/ofcontroller/linkdiscovery/internal/EventHistoryTopologyLink.java
similarity index 96%
rename from src/main/java/net/floodlightcontroller/linkdiscovery/internal/EventHistoryTopologyLink.java
rename to src/main/java/net/onrc/onos/ofcontroller/linkdiscovery/internal/EventHistoryTopologyLink.java
index 98796ed..5d2e955 100644
--- a/src/main/java/net/floodlightcontroller/linkdiscovery/internal/EventHistoryTopologyLink.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/linkdiscovery/internal/EventHistoryTopologyLink.java
@@ -1,4 +1,4 @@
-package net.floodlightcontroller.linkdiscovery.internal;
+package net.onrc.onos.ofcontroller.linkdiscovery.internal;
 
 import net.floodlightcontroller.core.web.serializers.DPIDSerializer;
 
diff --git a/src/main/java/net/floodlightcontroller/linkdiscovery/internal/EventHistoryTopologySwitch.java b/src/main/java/net/onrc/onos/ofcontroller/linkdiscovery/internal/EventHistoryTopologySwitch.java
similarity index 94%
rename from src/main/java/net/floodlightcontroller/linkdiscovery/internal/EventHistoryTopologySwitch.java
rename to src/main/java/net/onrc/onos/ofcontroller/linkdiscovery/internal/EventHistoryTopologySwitch.java
index 001942b..d6afd7a 100644
--- a/src/main/java/net/floodlightcontroller/linkdiscovery/internal/EventHistoryTopologySwitch.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/linkdiscovery/internal/EventHistoryTopologySwitch.java
@@ -1,4 +1,4 @@
-package net.floodlightcontroller.linkdiscovery.internal;
+package net.onrc.onos.ofcontroller.linkdiscovery.internal;
 
 import net.floodlightcontroller.core.web.serializers.DPIDSerializer;
 import net.floodlightcontroller.core.web.serializers.IPv4Serializer;
diff --git a/src/main/java/net/floodlightcontroller/linkdiscovery/internal/LinkDiscoveryManager.java b/src/main/java/net/onrc/onos/ofcontroller/linkdiscovery/internal/LinkDiscoveryManager.java
similarity index 97%
rename from src/main/java/net/floodlightcontroller/linkdiscovery/internal/LinkDiscoveryManager.java
rename to src/main/java/net/onrc/onos/ofcontroller/linkdiscovery/internal/LinkDiscoveryManager.java
index ac44eeb..f057a29 100644
--- a/src/main/java/net/floodlightcontroller/linkdiscovery/internal/LinkDiscoveryManager.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/linkdiscovery/internal/LinkDiscoveryManager.java
@@ -15,7 +15,7 @@
  *    under the License.
  **/
 
-package net.floodlightcontroller.linkdiscovery.internal;
+package net.onrc.onos.ofcontroller.linkdiscovery.internal;
 
 import java.io.IOException;
 import java.net.InetAddress;
@@ -56,15 +56,6 @@
 import net.floodlightcontroller.core.module.IFloodlightModule;
 import net.floodlightcontroller.core.module.IFloodlightService;
 import net.floodlightcontroller.core.util.SingletonTask;
-import net.floodlightcontroller.linkdiscovery.ILinkDiscovery;
-import net.floodlightcontroller.linkdiscovery.ILinkDiscovery.LDUpdate;
-import net.floodlightcontroller.linkdiscovery.ILinkDiscovery.LinkType;
-import net.floodlightcontroller.linkdiscovery.ILinkDiscovery.SwitchType;
-import net.floodlightcontroller.linkdiscovery.ILinkDiscovery.UpdateOperation;
-import net.floodlightcontroller.linkdiscovery.ILinkDiscoveryListener;
-import net.floodlightcontroller.linkdiscovery.ILinkDiscoveryService;
-import net.floodlightcontroller.linkdiscovery.LinkInfo;
-import net.floodlightcontroller.linkdiscovery.web.LinkDiscoveryWebRoutable;
 import net.floodlightcontroller.packet.BSN;
 import net.floodlightcontroller.packet.Ethernet;
 import net.floodlightcontroller.packet.IPv4;
@@ -81,6 +72,16 @@
 import net.floodlightcontroller.topology.NodePortTuple;
 import net.floodlightcontroller.util.EventHistory;
 import net.floodlightcontroller.util.EventHistory.EvAction;
+import net.onrc.onos.ofcontroller.core.IOnosRemoteSwitch;
+import net.onrc.onos.ofcontroller.linkdiscovery.ILinkDiscovery;
+import net.onrc.onos.ofcontroller.linkdiscovery.ILinkDiscoveryListener;
+import net.onrc.onos.ofcontroller.linkdiscovery.ILinkDiscoveryService;
+import net.onrc.onos.ofcontroller.linkdiscovery.LinkInfo;
+import net.onrc.onos.ofcontroller.linkdiscovery.ILinkDiscovery.LDUpdate;
+import net.onrc.onos.ofcontroller.linkdiscovery.ILinkDiscovery.LinkType;
+import net.onrc.onos.ofcontroller.linkdiscovery.ILinkDiscovery.SwitchType;
+import net.onrc.onos.ofcontroller.linkdiscovery.ILinkDiscovery.UpdateOperation;
+import net.onrc.onos.ofcontroller.linkdiscovery.web.LinkDiscoveryWebRoutable;
 import net.onrc.onos.registry.controller.IControllerRegistryService;
 
 import org.openflow.protocol.OFMessage;
@@ -126,12 +127,6 @@
 IStorageSourceListener, ILinkDiscoveryService,
 IFloodlightModule, IInfoProvider, IHAListener {
     protected static Logger log = LoggerFactory.getLogger(LinkDiscoveryManager.class);
-    
-    protected enum NetworkMapOperation {
-    	NONE,
-    	INSERT,
-    	UPDATE
-    }
 
     // Names of table/fields for links in the storage API
     private static final String LINK_TABLE_NAME = "controller_link";
@@ -151,8 +146,10 @@
     protected IStorageSourceService storageSource;
     protected IThreadPoolService threadPool;
     protected IRestApiService restApi;
+    // Registry Service for ONOS
     protected IControllerRegistryService registryService;
 
+
     // LLDP and BDDP fields
     private static final byte[] LLDP_STANDARD_DST_MAC_STRING = 
             HexString.fromHexString("01:80:c2:00:00:0e");
@@ -196,7 +193,7 @@
     protected LLDPTLV controllerTLV;
     protected ReentrantReadWriteLock lock;
     int lldpTimeCount = 0;
-    
+
     /**
      * Flag to indicate if automatic port fast is enabled or not.
      * Default is set to false -- Initialized in the init method as well.
@@ -205,10 +202,10 @@
 
     /**
      * Map of remote switches that are not connected to this controller. This
-     * is used to learn remote switches in a distributed controller.
+     * is used to learn remote switches in a distributed controller ONOS.
      */
-    protected Map<Long, IOFSwitch> remoteSwitches;
-    
+    protected Map<Long, IOnosRemoteSwitch> remoteSwitches;
+
     /**
      * Map from link to the most recent time it was verified functioning
      */
@@ -519,10 +516,10 @@
     }
 
     /**
-     * Learn remote switches when running as a distributed controller
+     * Learn remote switches when running as a distributed controller ONOS
      */
     protected IOFSwitch addRemoteSwitch(long sw, short port) {
-    	IOFSwitch remotesw = null;
+    	IOnosRemoteSwitch remotesw = null;
     	
     	// add a switch if we have not seen it before
     	remotesw = remoteSwitches.get(sw);
@@ -810,6 +807,7 @@
                 ByteBuffer dpidBB = ByteBuffer.wrap(lldptlv.getValue());
                 remoteSwitch = floodlightProvider.getSwitches().get(dpidBB.getLong(4));
                 if (remoteSwitch == null) {
+                	// Added by ONOS
                 	// floodlight LLDP coming from a remote switch connected to a different controller
                 	// add it to our cache of unconnected remote switches
                 	remoteSwitch = addRemoteSwitch(dpidBB.getLong(4), remotePort);
@@ -842,7 +840,7 @@
                     log.trace("Getting BDDP packets from a different controller" +
                             "and letting it go through normal processing chain.");
                 }
-                //XXX Fix the BDDP broadcast issue
+                //XXX ONOS: Fix the BDDP broadcast issue
                 //return Command.CONTINUE;
                 return Command.STOP;
             }
@@ -963,7 +961,6 @@
             if (bsn.getPayload() instanceof LLDP == false)
                 return Command.CONTINUE;
             return handleLldp((LLDP) bsn.getPayload(), sw, pi, false, cntx);
-            //return Command.STOP;
         } else if (eth.getEtherType() == Ethernet.TYPE_LLDP)  {
             return handleLldp((LLDP) eth.getPayload(), sw, pi, true, cntx);
         } else if (eth.getEtherType() < 1500) {
@@ -1013,7 +1010,6 @@
 
         NodePortTuple srcNpt, dstNpt;
         boolean linkChanged = false;
-        NetworkMapOperation operation = NetworkMapOperation.NONE;
 
         lock.writeLock().lock();
         try {
@@ -1061,6 +1057,7 @@
 
                 writeLinkToStorage(lt, newInfo);
                 
+                // ONOS: Distinguish added event separately from updated event
                 updateOperation = UpdateOperation.LINK_ADDED;
                 linkChanged = true;
 
@@ -1116,7 +1113,7 @@
                 // valid time, plus the port states if they've changed (i.e. if
                 // they weren't set to null in the previous block of code.
                 writeLinkToStorage(lt, newInfo);
-                
+
                 if (linkChanged) {
                     updateOperation = getUpdateOperation(newInfo.getSrcPortState(),
                                                          newInfo.getDstPortState());
@@ -1145,7 +1142,6 @@
         } finally {
             lock.writeLock().unlock();
         }
-        
 
         return linkChanged;
     }
@@ -1159,14 +1155,6 @@
      * @param links The List of @LinkTuple to delete.
      */
     protected void deleteLinks(List<Link> links, String reason) {
-    	deleteLinks(links, reason, Boolean.TRUE);
-    }
-    
-    /**
-     * Removes links from memory and storage.
-     * @param links The List of @LinkTuple to delete.
-     */
-    protected void deleteLinks(List<Link> links, String reason, Boolean hasControl) {
         NodePortTuple srcNpt, dstNpt;
 
         lock.writeLock().lock();
@@ -1212,7 +1200,7 @@
 
                 // remove link from storage.
                 removeLinkFromStorage(lt);
-                
+
                 // TODO  Whenever link is removed, it has to checked if
                 // the switchports must be added to quarantine.
 
@@ -1236,8 +1224,8 @@
 
         IOFSwitch iofSwitch = floodlightProvider.getSwitches().get(sw);
         if (iofSwitch == null) return Command.CONTINUE;
-        
-        // If we do not control this switch, then we should not process its port status messages
+
+        // ONOS: If we do not control this switch, then we should not process its port status messages
         if (!registryService.hasControl(iofSwitch.getId())) return Command.CONTINUE;
         
         if (log.isTraceEnabled()) {
@@ -1263,7 +1251,6 @@
                     ((byte)OFPortReason.OFPPR_MODIFY.ordinal() ==
                     ps.getReason() && !portEnabled(ps.getDesc()))) {
                 deleteLinksOnPort(npt, "Port Status Changed");
-                
                 LDUpdate update = new LDUpdate(sw, port, UpdateOperation.PORT_DOWN);
                 updates.add(update);
                 linkDeleted = true;
@@ -1306,7 +1293,6 @@
                                                      getLinkType(lt, linkInfo),
                                                      operation));
                             writeLinkToStorage(lt, linkInfo);
-                            
                             linkInfoChanged = true;
                         }
                     }
@@ -1410,11 +1396,7 @@
                 }
                 // add all tuples with an endpoint on this switch to erase list
                 eraseList.addAll(switchLinks.get(sw));
-                
-                // We can get called to delete links when we lose mastership. To avoid clearing the network map in that case,
-                // figure out if we have control of the switch
-                boolean hasControl = registryService.hasControl(sw);
-                deleteLinks(eraseList, "Switch Removed", hasControl);
+                deleteLinks(eraseList, "Switch Removed");
 
                 // Send a switch removed update
                 LDUpdate update = new LDUpdate(sw, null, UpdateOperation.SWITCH_REMOVED);
@@ -1844,6 +1826,7 @@
         l.add(IStorageSourceService.class);
         l.add(IThreadPoolService.class);
         l.add(IRestApiService.class);
+        // Added by ONOS
         l.add(IControllerRegistryService.class);
         return l;
     }
@@ -1855,6 +1838,7 @@
         storageSource = context.getServiceImpl(IStorageSourceService.class);
         threadPool = context.getServiceImpl(IThreadPoolService.class);
         restApi = context.getServiceImpl(IRestApiService.class);
+        // Added by ONOS
         registryService = context.getServiceImpl(IControllerRegistryService.class);
 
         // Set the autoportfast feature to false.
@@ -1872,7 +1856,8 @@
         this.switchLinks = new HashMap<Long, Set<Link>>();
         this.quarantineQueue = new LinkedBlockingQueue<NodePortTuple>();
         this.maintenanceQueue = new LinkedBlockingQueue<NodePortTuple>();
-        this.remoteSwitches = new HashMap<Long, IOFSwitch>();
+        // Added by ONOS
+        this.remoteSwitches = new HashMap<Long, IOnosRemoteSwitch>();
 
         this.evHistTopologySwitch =
                 new EventHistory<EventHistoryTopologySwitch>("Topology: Switch");
@@ -1923,7 +1908,7 @@
             log.error("Error in installing listener for " +
             		  "switch table {}", SWITCH_CONFIG_TABLE_NAME);
         }
-                
+
         ScheduledExecutorService ses = threadPool.getScheduledExecutor();
 
         // To be started by the first switch connection
@@ -2134,16 +2119,4 @@
     public void setAutoPortFastFeature(boolean autoPortFastFeature) {
         this.autoPortFastFeature = autoPortFastFeature;
     }
-
-	@Override
-	public void switchPortAdded(Long switchId, OFPhysicalPort port) {
-		// TODO Auto-generated method stub
-		
-	}
-
-	@Override
-	public void switchPortRemoved(Long switchId, OFPhysicalPort port) {
-		// TODO Auto-generated method stub
-		
-	}
 }
diff --git a/src/main/java/net/floodlightcontroller/linkdiscovery/web/AutoPortFast.java b/src/main/java/net/onrc/onos/ofcontroller/linkdiscovery/web/AutoPortFast.java
similarity index 89%
rename from src/main/java/net/floodlightcontroller/linkdiscovery/web/AutoPortFast.java
rename to src/main/java/net/onrc/onos/ofcontroller/linkdiscovery/web/AutoPortFast.java
index 8f4f4ad..29dc890 100644
--- a/src/main/java/net/floodlightcontroller/linkdiscovery/web/AutoPortFast.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/linkdiscovery/web/AutoPortFast.java
@@ -1,6 +1,6 @@
-package net.floodlightcontroller.linkdiscovery.web;
+package net.onrc.onos.ofcontroller.linkdiscovery.web;
 
-import net.floodlightcontroller.linkdiscovery.ILinkDiscoveryService;
+import net.onrc.onos.ofcontroller.linkdiscovery.ILinkDiscoveryService;
 
 import org.restlet.data.Status;
 import org.restlet.resource.Get;
diff --git a/src/main/java/net/floodlightcontroller/linkdiscovery/web/LinkDiscoveryWebRoutable.java b/src/main/java/net/onrc/onos/ofcontroller/linkdiscovery/web/LinkDiscoveryWebRoutable.java
similarity index 92%
rename from src/main/java/net/floodlightcontroller/linkdiscovery/web/LinkDiscoveryWebRoutable.java
rename to src/main/java/net/onrc/onos/ofcontroller/linkdiscovery/web/LinkDiscoveryWebRoutable.java
index 3990fba..8eae558 100644
--- a/src/main/java/net/floodlightcontroller/linkdiscovery/web/LinkDiscoveryWebRoutable.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/linkdiscovery/web/LinkDiscoveryWebRoutable.java
@@ -1,4 +1,4 @@
-package net.floodlightcontroller.linkdiscovery.web;
+package net.onrc.onos.ofcontroller.linkdiscovery.web;
 
 import net.floodlightcontroller.restserver.RestletRoutable;
 
diff --git a/src/main/java/net/floodlightcontroller/linkdiscovery/web/LinkWithType.java b/src/main/java/net/onrc/onos/ofcontroller/linkdiscovery/web/LinkWithType.java
similarity index 94%
rename from src/main/java/net/floodlightcontroller/linkdiscovery/web/LinkWithType.java
rename to src/main/java/net/onrc/onos/ofcontroller/linkdiscovery/web/LinkWithType.java
index 893e4ad..3e5a5e7 100644
--- a/src/main/java/net/floodlightcontroller/linkdiscovery/web/LinkWithType.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/linkdiscovery/web/LinkWithType.java
@@ -1,4 +1,4 @@
-package net.floodlightcontroller.linkdiscovery.web;
+package net.onrc.onos.ofcontroller.linkdiscovery.web;
 
 import java.io.IOException;
 
@@ -9,8 +9,8 @@
 import org.codehaus.jackson.map.annotate.JsonSerialize;
 import org.openflow.util.HexString;
 
-import net.floodlightcontroller.linkdiscovery.ILinkDiscovery.LinkType;
 import net.floodlightcontroller.routing.Link;
+import net.onrc.onos.ofcontroller.linkdiscovery.ILinkDiscovery.LinkType;
 
 /**
  * This class is both the datastructure and the serializer
diff --git a/src/main/java/net/floodlightcontroller/linkdiscovery/web/LinksResource.java b/src/main/java/net/onrc/onos/ofcontroller/linkdiscovery/web/LinksResource.java
similarity index 86%
rename from src/main/java/net/floodlightcontroller/linkdiscovery/web/LinksResource.java
rename to src/main/java/net/onrc/onos/ofcontroller/linkdiscovery/web/LinksResource.java
index 4cad18e..c522a05 100644
--- a/src/main/java/net/floodlightcontroller/linkdiscovery/web/LinksResource.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/linkdiscovery/web/LinksResource.java
@@ -1,13 +1,13 @@
-package net.floodlightcontroller.linkdiscovery.web;
+package net.onrc.onos.ofcontroller.linkdiscovery.web;
 
 import java.util.HashMap;
 import java.util.HashSet;
 import java.util.Map;
 import java.util.Set;
 
-import net.floodlightcontroller.linkdiscovery.ILinkDiscoveryService;
-import net.floodlightcontroller.linkdiscovery.LinkInfo;
 import net.floodlightcontroller.routing.Link;
+import net.onrc.onos.ofcontroller.linkdiscovery.ILinkDiscoveryService;
+import net.onrc.onos.ofcontroller.linkdiscovery.LinkInfo;
 
 import org.restlet.resource.Get;
 import org.restlet.resource.ServerResource;
diff --git a/src/main/java/net/onrc/onos/ofcontroller/routing/TopoRouteService.java b/src/main/java/net/onrc/onos/ofcontroller/routing/TopoRouteService.java
index a051d4c..1671412 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/routing/TopoRouteService.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/routing/TopoRouteService.java
@@ -23,8 +23,6 @@
 import net.onrc.onos.ofcontroller.util.FlowEntry;
 import net.onrc.onos.ofcontroller.util.Port;
 import net.onrc.onos.ofcontroller.util.SwitchPort;
-import net.onrc.onos.util.GraphDBConnection;
-import net.onrc.onos.util.GraphDBConnection.Transaction;
 import net.onrc.onos.util.GraphDBOperation;
 
 import org.openflow.util.HexString;
@@ -32,7 +30,6 @@
 import org.slf4j.LoggerFactory;
 
 import com.tinkerpop.blueprints.Direction;
-import com.tinkerpop.blueprints.TransactionalGraph.Conclusion;
 import com.tinkerpop.blueprints.Vertex;
 import com.tinkerpop.pipes.PipeFunction;
 import com.tinkerpop.pipes.branch.LoopPipe.LoopBundle;
@@ -135,7 +132,7 @@
     public void init(FloodlightModuleContext context)
 	throws FloodlightModuleException {
 	// TODO: Add the appropriate initialization
-    	op = new GraphDBOperation(GraphDBConnection.getInstance(""));
+    	op = new GraphDBOperation("");
     }
 
     @Override
@@ -266,7 +263,7 @@
      * See the documentation for method @ref prepareShortestPathTopo()
      * for additional information and usage.
      *
-     * @shortestPathTopo the Shortest Path info handler to release.
+     * @param shortestPathTopo the Shortest Path info handler to release.
      */
     public void dropShortestPathTopo(Map<Long, ?> shortestPathTopo) {
 	shortestPathTopo = null;
diff --git a/src/main/java/net/floodlightcontroller/topology/web/RouteResource.java b/src/main/java/net/onrc/onos/ofcontroller/topology/web/RouteResource.java
similarity index 86%
rename from src/main/java/net/floodlightcontroller/topology/web/RouteResource.java
rename to src/main/java/net/onrc/onos/ofcontroller/topology/web/RouteResource.java
index 906a579..5ad892b 100644
--- a/src/main/java/net/floodlightcontroller/topology/web/RouteResource.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/topology/web/RouteResource.java
@@ -1,17 +1,11 @@
-package net.floodlightcontroller.topology.web;
+package net.onrc.onos.ofcontroller.topology.web;
 
-import java.util.List;
-
-import net.floodlightcontroller.routing.IRoutingService;
-import net.floodlightcontroller.routing.Route;
-import net.floodlightcontroller.topology.NodePortTuple;
 import net.onrc.onos.ofcontroller.core.INetMapTopologyService.ITopoRouteService;
 import net.onrc.onos.ofcontroller.util.DataPath;
 import net.onrc.onos.ofcontroller.util.Dpid;
 import net.onrc.onos.ofcontroller.util.Port;
 import net.onrc.onos.ofcontroller.util.SwitchPort;
 
-import org.openflow.util.HexString;
 import org.restlet.resource.Get;
 import org.restlet.resource.ServerResource;
 import org.slf4j.Logger;
diff --git a/src/main/java/net/onrc/onos/ofcontroller/util/DataPath.java b/src/main/java/net/onrc/onos/ofcontroller/util/DataPath.java
index f02552b..5f96414 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/util/DataPath.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/util/DataPath.java
@@ -2,7 +2,6 @@
 
 import java.util.ArrayList;
 
-
 import org.codehaus.jackson.annotate.JsonProperty;
 
 /**
diff --git a/src/main/java/net/onrc/onos/ofcontroller/util/Dpid.java b/src/main/java/net/onrc/onos/ofcontroller/util/Dpid.java
index ce8a4f6..c3cf3aa 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/util/Dpid.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/util/Dpid.java
@@ -1,13 +1,11 @@
 package net.onrc.onos.ofcontroller.util;
 
-import org.openflow.util.HexString;
-
 import net.onrc.onos.ofcontroller.util.serializers.DpidDeserializer;
 import net.onrc.onos.ofcontroller.util.serializers.DpidSerializer;
 
-import org.codehaus.jackson.annotate.JsonProperty;
 import org.codehaus.jackson.map.annotate.JsonDeserialize;
 import org.codehaus.jackson.map.annotate.JsonSerialize;
+import org.openflow.util.HexString;
 
 /**
  * The class representing a network switch DPID.
diff --git a/src/main/java/net/onrc/onos/ofcontroller/util/FlowEntry.java b/src/main/java/net/onrc/onos/ofcontroller/util/FlowEntry.java
index ac32d0b..7dd0699 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/util/FlowEntry.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/util/FlowEntry.java
@@ -2,15 +2,6 @@
 
 import java.util.ArrayList;
 
-
-import net.floodlightcontroller.util.MACAddress;
-import net.onrc.onos.ofcontroller.util.FlowEntryAction;
-import net.onrc.onos.ofcontroller.util.FlowEntryErrorState;
-import net.onrc.onos.ofcontroller.util.FlowEntryId;
-import net.onrc.onos.ofcontroller.util.FlowEntryMatch;
-import net.onrc.onos.ofcontroller.util.FlowEntrySwitchState;
-import net.onrc.onos.ofcontroller.util.FlowEntryUserState;
-
 import org.codehaus.jackson.annotate.JsonIgnore;
 import org.codehaus.jackson.annotate.JsonProperty;
 
diff --git a/src/main/java/net/onrc/onos/ofcontroller/util/FlowEntryAction.java b/src/main/java/net/onrc/onos/ofcontroller/util/FlowEntryAction.java
index 858272c..22aef98 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/util/FlowEntryAction.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/util/FlowEntryAction.java
@@ -1,7 +1,6 @@
 package net.onrc.onos.ofcontroller.util;
 
 import net.floodlightcontroller.util.MACAddress;
-import net.onrc.onos.ofcontroller.util.Port.PortValues;
 
 import org.codehaus.jackson.annotate.JsonProperty;
 
diff --git a/src/main/java/net/onrc/onos/ofcontroller/util/FlowEntryId.java b/src/main/java/net/onrc/onos/ofcontroller/util/FlowEntryId.java
index 7a8f67b..c4e75a5 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/util/FlowEntryId.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/util/FlowEntryId.java
@@ -5,7 +5,6 @@
 import net.onrc.onos.ofcontroller.util.serializers.FlowEntryIdDeserializer;
 import net.onrc.onos.ofcontroller.util.serializers.FlowEntryIdSerializer;
 
-import org.codehaus.jackson.annotate.JsonProperty;
 import org.codehaus.jackson.map.annotate.JsonDeserialize;
 import org.codehaus.jackson.map.annotate.JsonSerialize;
 
diff --git a/src/main/java/net/onrc/onos/ofcontroller/util/FlowId.java b/src/main/java/net/onrc/onos/ofcontroller/util/FlowId.java
index b9652b8..2310972 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/util/FlowId.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/util/FlowId.java
@@ -5,7 +5,6 @@
 import net.onrc.onos.ofcontroller.util.serializers.FlowIdDeserializer;
 import net.onrc.onos.ofcontroller.util.serializers.FlowIdSerializer;
 
-import org.codehaus.jackson.annotate.JsonProperty;
 import org.codehaus.jackson.map.annotate.JsonDeserialize;
 import org.codehaus.jackson.map.annotate.JsonSerialize;
 
diff --git a/src/main/java/net/onrc/onos/ofcontroller/util/FlowPath.java b/src/main/java/net/onrc/onos/ofcontroller/util/FlowPath.java
index 29898e6..f9385e7 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/util/FlowPath.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/util/FlowPath.java
@@ -5,8 +5,6 @@
 import net.floodlightcontroller.util.MACAddress;
 import net.onrc.onos.ofcontroller.core.INetMapTopologyObjects.IFlowEntry;
 import net.onrc.onos.ofcontroller.core.INetMapTopologyObjects.IFlowPath;
-import net.onrc.onos.ofcontroller.util.FlowEntryMatch;
-import net.onrc.onos.ofcontroller.util.FlowId;
 
 import org.codehaus.jackson.annotate.JsonProperty;
 
diff --git a/src/main/java/net/onrc/onos/ofcontroller/util/IPv4.java b/src/main/java/net/onrc/onos/ofcontroller/util/IPv4.java
index a9d7d85..2081bbe 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/util/IPv4.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/util/IPv4.java
@@ -3,7 +3,6 @@
 import net.onrc.onos.ofcontroller.util.serializers.IPv4Deserializer;
 import net.onrc.onos.ofcontroller.util.serializers.IPv4Serializer;
 
-import org.codehaus.jackson.annotate.JsonProperty;
 import org.codehaus.jackson.map.annotate.JsonDeserialize;
 import org.codehaus.jackson.map.annotate.JsonSerialize;
 
diff --git a/src/main/java/net/onrc/onos/ofcontroller/util/IPv4Net.java b/src/main/java/net/onrc/onos/ofcontroller/util/IPv4Net.java
index fdc6dca..52e6535 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/util/IPv4Net.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/util/IPv4Net.java
@@ -1,10 +1,8 @@
 package net.onrc.onos.ofcontroller.util;
 
-import net.onrc.onos.ofcontroller.util.IPv4;
 import net.onrc.onos.ofcontroller.util.serializers.IPv4NetDeserializer;
 import net.onrc.onos.ofcontroller.util.serializers.IPv4NetSerializer;
 
-import org.codehaus.jackson.annotate.JsonProperty;
 import org.codehaus.jackson.map.annotate.JsonDeserialize;
 import org.codehaus.jackson.map.annotate.JsonSerialize;
 
diff --git a/src/main/java/net/onrc/onos/ofcontroller/util/IPv6.java b/src/main/java/net/onrc/onos/ofcontroller/util/IPv6.java
index 82d1db5..2d28db8 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/util/IPv6.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/util/IPv6.java
@@ -1,13 +1,11 @@
 package net.onrc.onos.ofcontroller.util;
 
-import org.openflow.util.HexString;
-
 import net.onrc.onos.ofcontroller.util.serializers.IPv6Deserializer;
 import net.onrc.onos.ofcontroller.util.serializers.IPv6Serializer;
 
-import org.codehaus.jackson.annotate.JsonProperty;
 import org.codehaus.jackson.map.annotate.JsonDeserialize;
 import org.codehaus.jackson.map.annotate.JsonSerialize;
+import org.openflow.util.HexString;
 
 /**
  * The class representing an IPv6 address.
diff --git a/src/main/java/net/onrc/onos/ofcontroller/util/IPv6Net.java b/src/main/java/net/onrc/onos/ofcontroller/util/IPv6Net.java
index aacb648..bafff24 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/util/IPv6Net.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/util/IPv6Net.java
@@ -1,10 +1,8 @@
 package net.onrc.onos.ofcontroller.util;
 
-import net.onrc.onos.ofcontroller.util.IPv6;
 import net.onrc.onos.ofcontroller.util.serializers.IPv6NetDeserializer;
 import net.onrc.onos.ofcontroller.util.serializers.IPv6NetSerializer;
 
-import org.codehaus.jackson.annotate.JsonProperty;
 import org.codehaus.jackson.map.annotate.JsonDeserialize;
 import org.codehaus.jackson.map.annotate.JsonSerialize;
 
diff --git a/src/main/java/net/onrc/onos/ofcontroller/util/SwitchPort.java b/src/main/java/net/onrc/onos/ofcontroller/util/SwitchPort.java
index afc2af3..95a934f 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/util/SwitchPort.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/util/SwitchPort.java
@@ -1,7 +1,5 @@
 package net.onrc.onos.ofcontroller.util;
 
-import net.onrc.onos.ofcontroller.util.Port;
-
 import org.codehaus.jackson.annotate.JsonProperty;
 
 /**
diff --git a/src/main/java/net/onrc/onos/ofcontroller/util/serializers/DpidDeserializer.java b/src/main/java/net/onrc/onos/ofcontroller/util/serializers/DpidDeserializer.java
index f6b1ea0..9075f96 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/util/serializers/DpidDeserializer.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/util/serializers/DpidDeserializer.java
@@ -2,16 +2,13 @@
 
 import java.io.IOException;
 
-import org.codehaus.jackson.JsonNode;
-import org.codehaus.jackson.JsonParser;
-import org.codehaus.jackson.JsonToken;
-import org.codehaus.jackson.JsonProcessingException;
-import org.codehaus.jackson.ObjectCodec;
-import org.codehaus.jackson.map.JsonDeserializer;
-import org.codehaus.jackson.map.DeserializationContext;
-
 import net.onrc.onos.ofcontroller.util.Dpid;
 
+import org.codehaus.jackson.JsonParser;
+import org.codehaus.jackson.JsonProcessingException;
+import org.codehaus.jackson.JsonToken;
+import org.codehaus.jackson.map.DeserializationContext;
+import org.codehaus.jackson.map.JsonDeserializer;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
diff --git a/src/main/java/net/onrc/onos/ofcontroller/util/serializers/DpidSerializer.java b/src/main/java/net/onrc/onos/ofcontroller/util/serializers/DpidSerializer.java
index 0da74d4..7ece4d3 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/util/serializers/DpidSerializer.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/util/serializers/DpidSerializer.java
@@ -2,13 +2,13 @@
 
 import java.io.IOException;
 
+import net.onrc.onos.ofcontroller.util.Dpid;
+
 import org.codehaus.jackson.JsonGenerator;
 import org.codehaus.jackson.JsonProcessingException;
 import org.codehaus.jackson.map.JsonSerializer;
 import org.codehaus.jackson.map.SerializerProvider;
 
-import net.onrc.onos.ofcontroller.util.Dpid;
-
 /**
  * Serialize a DPID as a string.
  */
diff --git a/src/main/java/net/onrc/onos/ofcontroller/util/serializers/FlowEntryIdDeserializer.java b/src/main/java/net/onrc/onos/ofcontroller/util/serializers/FlowEntryIdDeserializer.java
index 7a15ddc..72ddfea 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/util/serializers/FlowEntryIdDeserializer.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/util/serializers/FlowEntryIdDeserializer.java
@@ -2,16 +2,13 @@
 
 import java.io.IOException;
 
-import org.codehaus.jackson.JsonNode;
-import org.codehaus.jackson.JsonParser;
-import org.codehaus.jackson.JsonToken;
-import org.codehaus.jackson.JsonProcessingException;
-import org.codehaus.jackson.ObjectCodec;
-import org.codehaus.jackson.map.JsonDeserializer;
-import org.codehaus.jackson.map.DeserializationContext;
-
 import net.onrc.onos.ofcontroller.util.FlowEntryId;
 
+import org.codehaus.jackson.JsonParser;
+import org.codehaus.jackson.JsonProcessingException;
+import org.codehaus.jackson.JsonToken;
+import org.codehaus.jackson.map.DeserializationContext;
+import org.codehaus.jackson.map.JsonDeserializer;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
diff --git a/src/main/java/net/onrc/onos/ofcontroller/util/serializers/FlowEntryIdSerializer.java b/src/main/java/net/onrc/onos/ofcontroller/util/serializers/FlowEntryIdSerializer.java
index 00f4d61..bf73265 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/util/serializers/FlowEntryIdSerializer.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/util/serializers/FlowEntryIdSerializer.java
@@ -2,13 +2,13 @@
 
 import java.io.IOException;
 
+import net.onrc.onos.ofcontroller.util.FlowEntryId;
+
 import org.codehaus.jackson.JsonGenerator;
 import org.codehaus.jackson.JsonProcessingException;
 import org.codehaus.jackson.map.JsonSerializer;
 import org.codehaus.jackson.map.SerializerProvider;
 
-import net.onrc.onos.ofcontroller.util.FlowEntryId;
-
 /**
  * Serialize a Flow Entry ID as a hexadecimal string.
  */
diff --git a/src/main/java/net/onrc/onos/ofcontroller/util/serializers/FlowIdDeserializer.java b/src/main/java/net/onrc/onos/ofcontroller/util/serializers/FlowIdDeserializer.java
index 6e04108..eb93a23 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/util/serializers/FlowIdDeserializer.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/util/serializers/FlowIdDeserializer.java
@@ -2,16 +2,13 @@
 
 import java.io.IOException;
 
-import org.codehaus.jackson.JsonNode;
-import org.codehaus.jackson.JsonParser;
-import org.codehaus.jackson.JsonToken;
-import org.codehaus.jackson.JsonProcessingException;
-import org.codehaus.jackson.ObjectCodec;
-import org.codehaus.jackson.map.JsonDeserializer;
-import org.codehaus.jackson.map.DeserializationContext;
-
 import net.onrc.onos.ofcontroller.util.FlowId;
 
+import org.codehaus.jackson.JsonParser;
+import org.codehaus.jackson.JsonProcessingException;
+import org.codehaus.jackson.JsonToken;
+import org.codehaus.jackson.map.DeserializationContext;
+import org.codehaus.jackson.map.JsonDeserializer;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
diff --git a/src/main/java/net/onrc/onos/ofcontroller/util/serializers/FlowIdSerializer.java b/src/main/java/net/onrc/onos/ofcontroller/util/serializers/FlowIdSerializer.java
index 575126f..34f6e05 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/util/serializers/FlowIdSerializer.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/util/serializers/FlowIdSerializer.java
@@ -2,13 +2,13 @@
 
 import java.io.IOException;
 
+import net.onrc.onos.ofcontroller.util.FlowId;
+
 import org.codehaus.jackson.JsonGenerator;
 import org.codehaus.jackson.JsonProcessingException;
 import org.codehaus.jackson.map.JsonSerializer;
 import org.codehaus.jackson.map.SerializerProvider;
 
-import net.onrc.onos.ofcontroller.util.FlowId;
-
 /**
  * Serialize a Flow ID as a hexadecimal string.
  */
diff --git a/src/main/java/net/onrc/onos/ofcontroller/util/serializers/IPv4Deserializer.java b/src/main/java/net/onrc/onos/ofcontroller/util/serializers/IPv4Deserializer.java
index 13ddc0d..daf90af 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/util/serializers/IPv4Deserializer.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/util/serializers/IPv4Deserializer.java
@@ -2,16 +2,13 @@
 
 import java.io.IOException;
 
-import org.codehaus.jackson.JsonNode;
-import org.codehaus.jackson.JsonParser;
-import org.codehaus.jackson.JsonToken;
-import org.codehaus.jackson.JsonProcessingException;
-import org.codehaus.jackson.ObjectCodec;
-import org.codehaus.jackson.map.JsonDeserializer;
-import org.codehaus.jackson.map.DeserializationContext;
-
 import net.onrc.onos.ofcontroller.util.IPv4;
 
+import org.codehaus.jackson.JsonParser;
+import org.codehaus.jackson.JsonProcessingException;
+import org.codehaus.jackson.JsonToken;
+import org.codehaus.jackson.map.DeserializationContext;
+import org.codehaus.jackson.map.JsonDeserializer;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
diff --git a/src/main/java/net/onrc/onos/ofcontroller/util/serializers/IPv4NetDeserializer.java b/src/main/java/net/onrc/onos/ofcontroller/util/serializers/IPv4NetDeserializer.java
index 1f30e91..f67ab38 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/util/serializers/IPv4NetDeserializer.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/util/serializers/IPv4NetDeserializer.java
@@ -2,16 +2,13 @@
 
 import java.io.IOException;
 
-import org.codehaus.jackson.JsonNode;
-import org.codehaus.jackson.JsonParser;
-import org.codehaus.jackson.JsonToken;
-import org.codehaus.jackson.JsonProcessingException;
-import org.codehaus.jackson.ObjectCodec;
-import org.codehaus.jackson.map.JsonDeserializer;
-import org.codehaus.jackson.map.DeserializationContext;
-
 import net.onrc.onos.ofcontroller.util.IPv4Net;
 
+import org.codehaus.jackson.JsonParser;
+import org.codehaus.jackson.JsonProcessingException;
+import org.codehaus.jackson.JsonToken;
+import org.codehaus.jackson.map.DeserializationContext;
+import org.codehaus.jackson.map.JsonDeserializer;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
diff --git a/src/main/java/net/onrc/onos/ofcontroller/util/serializers/IPv4NetSerializer.java b/src/main/java/net/onrc/onos/ofcontroller/util/serializers/IPv4NetSerializer.java
index 2580550..0454a58 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/util/serializers/IPv4NetSerializer.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/util/serializers/IPv4NetSerializer.java
@@ -2,13 +2,13 @@
 
 import java.io.IOException;
 
+import net.onrc.onos.ofcontroller.util.IPv4Net;
+
 import org.codehaus.jackson.JsonGenerator;
 import org.codehaus.jackson.JsonProcessingException;
 import org.codehaus.jackson.map.JsonSerializer;
 import org.codehaus.jackson.map.SerializerProvider;
 
-import net.onrc.onos.ofcontroller.util.IPv4Net;
-
 /**
  * Serialize an IPv4Net address as a string.
  */
diff --git a/src/main/java/net/onrc/onos/ofcontroller/util/serializers/IPv4Serializer.java b/src/main/java/net/onrc/onos/ofcontroller/util/serializers/IPv4Serializer.java
index 49dc140..aefc8a0 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/util/serializers/IPv4Serializer.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/util/serializers/IPv4Serializer.java
@@ -2,13 +2,13 @@
 
 import java.io.IOException;
 
+import net.onrc.onos.ofcontroller.util.IPv4;
+
 import org.codehaus.jackson.JsonGenerator;
 import org.codehaus.jackson.JsonProcessingException;
 import org.codehaus.jackson.map.JsonSerializer;
 import org.codehaus.jackson.map.SerializerProvider;
 
-import net.onrc.onos.ofcontroller.util.IPv4;
-
 /**
  * Serialize an IPv4 address as a string.
  */
diff --git a/src/main/java/net/onrc/onos/ofcontroller/util/serializers/IPv6Deserializer.java b/src/main/java/net/onrc/onos/ofcontroller/util/serializers/IPv6Deserializer.java
index 36109e8..7e3e5f6 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/util/serializers/IPv6Deserializer.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/util/serializers/IPv6Deserializer.java
@@ -2,16 +2,13 @@
 
 import java.io.IOException;
 
-import org.codehaus.jackson.JsonNode;
-import org.codehaus.jackson.JsonParser;
-import org.codehaus.jackson.JsonToken;
-import org.codehaus.jackson.JsonProcessingException;
-import org.codehaus.jackson.ObjectCodec;
-import org.codehaus.jackson.map.JsonDeserializer;
-import org.codehaus.jackson.map.DeserializationContext;
-
 import net.onrc.onos.ofcontroller.util.IPv6;
 
+import org.codehaus.jackson.JsonParser;
+import org.codehaus.jackson.JsonProcessingException;
+import org.codehaus.jackson.JsonToken;
+import org.codehaus.jackson.map.DeserializationContext;
+import org.codehaus.jackson.map.JsonDeserializer;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
diff --git a/src/main/java/net/onrc/onos/ofcontroller/util/serializers/IPv6NetDeserializer.java b/src/main/java/net/onrc/onos/ofcontroller/util/serializers/IPv6NetDeserializer.java
index ff3a0ee..d7631b3 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/util/serializers/IPv6NetDeserializer.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/util/serializers/IPv6NetDeserializer.java
@@ -2,16 +2,13 @@
 
 import java.io.IOException;
 
-import org.codehaus.jackson.JsonNode;
-import org.codehaus.jackson.JsonParser;
-import org.codehaus.jackson.JsonToken;
-import org.codehaus.jackson.JsonProcessingException;
-import org.codehaus.jackson.ObjectCodec;
-import org.codehaus.jackson.map.JsonDeserializer;
-import org.codehaus.jackson.map.DeserializationContext;
-
 import net.onrc.onos.ofcontroller.util.IPv6Net;
 
+import org.codehaus.jackson.JsonParser;
+import org.codehaus.jackson.JsonProcessingException;
+import org.codehaus.jackson.JsonToken;
+import org.codehaus.jackson.map.DeserializationContext;
+import org.codehaus.jackson.map.JsonDeserializer;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
diff --git a/src/main/java/net/onrc/onos/ofcontroller/util/serializers/IPv6NetSerializer.java b/src/main/java/net/onrc/onos/ofcontroller/util/serializers/IPv6NetSerializer.java
index e0837d5..06dc6cf 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/util/serializers/IPv6NetSerializer.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/util/serializers/IPv6NetSerializer.java
@@ -2,13 +2,13 @@
 
 import java.io.IOException;
 
+import net.onrc.onos.ofcontroller.util.IPv6Net;
+
 import org.codehaus.jackson.JsonGenerator;
 import org.codehaus.jackson.JsonProcessingException;
 import org.codehaus.jackson.map.JsonSerializer;
 import org.codehaus.jackson.map.SerializerProvider;
 
-import net.onrc.onos.ofcontroller.util.IPv6Net;
-
 /**
  * Serialize an IPv6Net address as a string.
  */
diff --git a/src/main/java/net/onrc/onos/ofcontroller/util/serializers/IPv6Serializer.java b/src/main/java/net/onrc/onos/ofcontroller/util/serializers/IPv6Serializer.java
index b4ac122..b6709b8 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/util/serializers/IPv6Serializer.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/util/serializers/IPv6Serializer.java
@@ -2,13 +2,13 @@
 
 import java.io.IOException;
 
+import net.onrc.onos.ofcontroller.util.IPv6;
+
 import org.codehaus.jackson.JsonGenerator;
 import org.codehaus.jackson.JsonProcessingException;
 import org.codehaus.jackson.map.JsonSerializer;
 import org.codehaus.jackson.map.SerializerProvider;
 
-import net.onrc.onos.ofcontroller.util.IPv6;
-
 /**
  * Serialize an IPv6 address as a string.
  */
diff --git a/src/main/java/net/onrc/onos/ofcontroller/util/serializers/MACAddressDeserializer.java b/src/main/java/net/onrc/onos/ofcontroller/util/serializers/MACAddressDeserializer.java
index 86ed2a7..dc4a0e2 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/util/serializers/MACAddressDeserializer.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/util/serializers/MACAddressDeserializer.java
@@ -2,16 +2,13 @@
 
 import java.io.IOException;
 
-import org.codehaus.jackson.JsonNode;
-import org.codehaus.jackson.JsonParser;
-import org.codehaus.jackson.JsonToken;
-import org.codehaus.jackson.JsonProcessingException;
-import org.codehaus.jackson.ObjectCodec;
-import org.codehaus.jackson.map.JsonDeserializer;
-import org.codehaus.jackson.map.DeserializationContext;
-
 import net.floodlightcontroller.util.MACAddress;
 
+import org.codehaus.jackson.JsonParser;
+import org.codehaus.jackson.JsonProcessingException;
+import org.codehaus.jackson.JsonToken;
+import org.codehaus.jackson.map.DeserializationContext;
+import org.codehaus.jackson.map.JsonDeserializer;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
diff --git a/src/main/java/net/onrc/onos/ofcontroller/util/serializers/MACAddressSerializer.java b/src/main/java/net/onrc/onos/ofcontroller/util/serializers/MACAddressSerializer.java
index 85c8dc4..9c0e225 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/util/serializers/MACAddressSerializer.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/util/serializers/MACAddressSerializer.java
@@ -2,13 +2,13 @@
 
 import java.io.IOException;
 
+import net.floodlightcontroller.util.MACAddress;
+
 import org.codehaus.jackson.JsonGenerator;
 import org.codehaus.jackson.JsonProcessingException;
 import org.codehaus.jackson.map.JsonSerializer;
 import org.codehaus.jackson.map.SerializerProvider;
 
-import net.floodlightcontroller.util.MACAddress;
-
 /**
  * Serialize a MAC address as a string.
  */
diff --git a/src/main/java/net/onrc/onos/util/GraphDBConnection.java b/src/main/java/net/onrc/onos/util/GraphDBConnection.java
index e25a0c6..1cc4e5a 100644
--- a/src/main/java/net/onrc/onos/util/GraphDBConnection.java
+++ b/src/main/java/net/onrc/onos/util/GraphDBConnection.java
@@ -43,6 +43,11 @@
 	}
 
 	/* Static 'instance' method */
+	/**
+	 * Get the instance of GraphDBConnection class.
+	 * @param conf the path to the database configuration file.
+	 * @return GraphDBConnection instance.
+	 */
 	public static synchronized GraphDBConnection getInstance(final String conf) {
 		if (GraphDBConnection.configFile == null
 				|| GraphDBConnection.configFile.isEmpty()) {
@@ -79,8 +84,10 @@
 		return singleton;
 	}
 
+	/** 
+	 * Get a FramedGraph instance of the graph.
+	 */
 	public FramedGraph<TitanGraph> getFramedGraph() {
-
 		if (isValid()) {
 			FramedGraph<TitanGraph> fg = new FramedGraph<TitanGraph>(graph);
 			return fg;
@@ -90,8 +97,11 @@
 		}
 	}
 
+	/**
+	 * Get EventTransactionalGraph of the titan graph.
+	 * @return EventTransactionalGraph of the titan graph
+	 */
 	protected EventTransactionalGraph<TitanGraph> getEventGraph() {
-
 		if (isValid()) {
 			return eg;
 		} else {
@@ -99,72 +109,50 @@
 		}
 	}
 
+	/**
+	 * Add LocalGraphChangedLister for the graph.
+	 */
 	public void addEventListener(final LocalGraphChangedListener listener) {
 		EventTransactionalGraph<TitanGraph> eg = this.getEventGraph();
 		eg.addListener(listener);
 		log.debug("Registered listener {}", listener.getClass());
 	}
 
+	/**
+	 * Return whether this connection is valid.
+	 */
 	public Boolean isValid() {
-
 		return (graph != null || graph.isOpen());
 	}
 
-	public void startTx() {
-
-	}
-
-	public void endTx(Transaction tx) {
+	/**
+	 * Commit changes for the graph operations.
+	 */
+	public void commit() {
 		try {
-			switch (tx) {
-			case COMMIT:
-				graph.commit();
-			case ROLLBACK:
-				graph.rollback();
-			}
-		} catch (Exception e) {
-			// TODO Auto-generated catch block
+			graph.commit();
+		}
+		catch (Exception e) {
 			log.error("{}", e.toString());
 		}
 	}
 
-	public void endTx(TransactionHandle tr, Transaction tx) {
-		switch (tx) {
-		case COMMIT:
-			if (tr != null && tr.tr != null) {
-				tr.tr.commit();
-			} else {
-				graph.commit();
-			}
-		case ROLLBACK:
-			if (tr != null && tr.tr != null) {
-				tr.tr.rollback();
-			} else {
-				graph.rollback();
-			}
-		}
-	}
-
-	public void endTx(Transaction tx, GenerateEvent fire) {
-
+	/**
+	 * Rollback changes for the graph operations.
+	 */
+	public void rollback() {
 		try {
-			if (fire.equals(GenerateEvent.TRUE)) {
-				switch (tx) {
-				case COMMIT:
-					eg.commit();
-				case ROLLBACK:
-					eg.rollback();
-				}
-			} else {
-				endTx(tx);
-			}
-		} catch (Exception e) {
-			// TODO Auto-generated catch block
-			e.printStackTrace();
+			graph.rollback();
+		}
+		catch (Exception e) {
+			log.error("{}", e.toString());
 		}
 	}
 
+	/**
+	 * Close this database connection.
+	 */
 	public void close() {
-		endTx(Transaction.COMMIT);
+		commit();
 	}
 }
diff --git a/src/main/java/net/onrc/onos/util/GraphDBOperation.java b/src/main/java/net/onrc/onos/util/GraphDBOperation.java
index 950741d..92157fb 100644
--- a/src/main/java/net/onrc/onos/util/GraphDBOperation.java
+++ b/src/main/java/net/onrc/onos/util/GraphDBOperation.java
@@ -12,16 +12,6 @@
 import net.onrc.onos.ofcontroller.util.FlowEntryId;
 import net.onrc.onos.ofcontroller.util.FlowId;
 
-//import net.floodlightcontroller.core.INetMapTopologyObjects.IDeviceObject;
-//import net.floodlightcontroller.core.INetMapTopologyObjects.IFlowEntry;
-//import net.floodlightcontroller.core.INetMapTopologyObjects.IFlowPath;
-//import net.floodlightcontroller.core.INetMapTopologyObjects.IPortObject;
-//import net.floodlightcontroller.core.INetMapTopologyObjects.ISwitchObject;
-//import net.floodlightcontroller.core.ISwitchStorage.SwitchState;
-//import net.floodlightcontroller.util.FlowEntryId;
-//import net.floodlightcontroller.util.FlowId;
-import net.onrc.onos.util.GraphDBConnection.Transaction;
-
 import com.thinkaurelius.titan.core.TitanGraph;
 import com.tinkerpop.blueprints.Vertex;
 import com.tinkerpop.frames.FramedGraph;
@@ -30,12 +20,27 @@
 
 public class GraphDBOperation implements IDBOperation {
 	private GraphDBConnection conn;
-	
+
+	/**
+	 * Create a GraphDBOperation instance from specified GraphDBConnection's instance.
+	 * @param dbConnection an instance of GraphDBConnection
+	 */
 	public GraphDBOperation(GraphDBConnection dbConnection) {
 		this.conn = dbConnection;
 	}
 
-	@Override
+	/**
+	 * Create a GraphDBOperation instance from database configuration path.
+	 * @param dbConfPath a path for database configuration file.
+	 */
+	public GraphDBOperation(final String dbConfPath) {
+		this.conn = GraphDBConnection.getInstance(dbConfPath);
+	}
+
+	/**
+	 * Create a new switch and return the created switch object.
+	 * @param dpid DPID of the switch
+	 */
 	public ISwitchObject newSwitch(String dpid) {
 		FramedGraph<TitanGraph> fg = conn.getFramedGraph();	
 		ISwitchObject obj = fg.addVertex(null,ISwitchObject.class);
@@ -46,7 +51,10 @@
 		return obj;
 	}
 
-	@Override
+	/**
+	 * Search and get a switch object with DPID.
+	 * @param dpid DPID of the switch 
+	 */
 	public ISwitchObject searchSwitch(String dpid) {
 		// TODO Auto-generated method stub
 		FramedGraph<TitanGraph> fg = conn.getFramedGraph();
@@ -56,7 +64,10 @@
 				
 	}
 
-	@Override
+	/**
+	 * Search and get an active switch object with DPID.
+	 * @param dpid DPID of the switch 
+	 */
 	public ISwitchObject searchActiveSwitch(String dpid) {
 	
 	    ISwitchObject sw = searchSwitch(dpid);
@@ -67,14 +78,18 @@
 	    return null;
 	}
 
-	@Override
+	/**
+	 * Get all switch objects.
+	 */
 	public Iterable<ISwitchObject> getAllSwitches() {
 		FramedGraph<TitanGraph> fg = conn.getFramedGraph();
 		Iterable<ISwitchObject> switches =  fg.getVertices("type","switch",ISwitchObject.class);
 		return switches;
 	}
 
-	@Override
+	/**
+	 * Get all active switch objects.
+	 */
 	public Iterable<ISwitchObject> getActiveSwitches() {
 		FramedGraph<TitanGraph> fg = conn.getFramedGraph();
 		Iterable<ISwitchObject> switches =  fg.getVertices("type","switch",ISwitchObject.class);
@@ -88,7 +103,9 @@
 		return activeSwitches;
 	}
 
-	@Override
+	/**
+	 * Get all inactive switch objects.
+	 */
 	public Iterable<ISwitchObject> getInactiveSwitches() {
 		FramedGraph<TitanGraph> fg = conn.getFramedGraph();
 		Iterable<ISwitchObject> switches =  fg.getVertices("type","switch",ISwitchObject.class);
@@ -102,20 +119,28 @@
 		return inactiveSwitches;
 	}
 
-	@Override
+	/**
+	 * Get all flow entries' objects where their switches are not updated.
+	 */
 	public Iterable<IFlowEntry> getAllSwitchNotUpdatedFlowEntries() {
 		FramedGraph<TitanGraph> fg = conn.getFramedGraph();
 		//TODO: Should use an enum for flow_switch_state
 		return fg.getVertices("switch_state", "FE_SWITCH_NOT_UPDATED", IFlowEntry.class);
 	}
 
-	@Override
+	/**
+	 * Remove specified switch.
+	 * @param sw switch object to remove
+	 */
 	public void removeSwitch(ISwitchObject sw) {
 		FramedGraph<TitanGraph> fg = conn.getFramedGraph();	
 		fg.removeVertex(sw.asVertex());		
 	}
 
-	@Override
+	/**
+	 * Create a port having specified port number.
+	 * @param portNumber port number
+	 */
 	public IPortObject newPort(Short portNumber) {
 		FramedGraph<TitanGraph> fg = conn.getFramedGraph();	
 		IPortObject obj = fg.addVertex(null,IPortObject.class);
@@ -126,25 +151,29 @@
 		return obj;
 	}
 
-	@Override
-		public IPortObject searchPort(String dpid, short number) {
-			ISwitchObject sw = searchSwitch(dpid);
-			if (sw != null) {
-				
-				IPortObject port = null;
-				
-				// Requires Frames 2.3.0
-				
-				try {
-					port = sw.getPort(number);
-				} catch (Exception e) {
-					// TODO Auto-generated catch block
-					e.printStackTrace();
-				}
-				
-				return port;
+	/**
+	 * Search and get a port object of specified switch and port number.
+	 * @param dpid DPID of a switch
+	 * @param number port number of the switch's port
+	 */
+	public IPortObject searchPort(String dpid, short number) {
+		ISwitchObject sw = searchSwitch(dpid);
+		if (sw != null) {
+			
+			IPortObject port = null;
+			
+			// Requires Frames 2.3.0
+			
+			try {
+				port = sw.getPort(number);
+			} catch (Exception e) {
+				// TODO Auto-generated catch block
+				e.printStackTrace();
 			}
 			
+			return port;
+		}
+			
 	//		if (sw != null) {
 	//			GremlinPipeline<Vertex, IPortObject> pipe = new GremlinPipeline<Vertex, IPortObject>();
 	//			pipe.start(sw.asVertex());
@@ -152,17 +181,22 @@
 	//			FramedVertexIterable<IPortObject> r = new FramedVertexIterable<IPortObject>(conn.getFramedGraph(), (Iterable) pipe, IPortObject.class);
 	//			return r != null && r.iterator().hasNext() ? r.iterator().next() : null;
 	//		}
-			return null;
-		}
+		return null;
+	}
 
-	@Override
-		public void removePort(IPortObject port) {
-			FramedGraph<TitanGraph> fg = conn.getFramedGraph();	
-	//		EventGraph<TitanGraph> eg = conn.getEventGraph();
-			if (fg != null) fg.removeVertex(port.asVertex());		
-		}
+	/**
+	 * Remove the specified switch port.
+	 * @param port switch port object to remove
+	 */
+	public void removePort(IPortObject port) {
+		FramedGraph<TitanGraph> fg = conn.getFramedGraph();	
+//		EventGraph<TitanGraph> eg = conn.getEventGraph();
+		if (fg != null) fg.removeVertex(port.asVertex());		
+	}
 
-	@Override
+	/**
+	 * Create and return a device object.
+	 */
 	public IDeviceObject newDevice() {
 		FramedGraph<TitanGraph> fg = conn.getFramedGraph();	
 		IDeviceObject obj = fg.addVertex(null,IDeviceObject.class);
@@ -170,28 +204,37 @@
 		return obj;
 	}
 
-	@Override
+	/**
+	 * Search and get a device object having specified MAC address.
+	 * @param macAddr MAC address to search and get
+	 */
 	public IDeviceObject searchDevice(String macAddr) {
 		// TODO Auto-generated method stub
 		FramedGraph<TitanGraph> fg = conn.getFramedGraph();	
-		return (fg != null && fg.getVertices("dl_addr",macAddr).iterator().hasNext()) ? fg.getVertices("dl_addr",macAddr,
-    			IDeviceObject.class).iterator().next() : null;
-    			
+		return (fg != null && fg.getVertices("dl_addr",macAddr).iterator().hasNext()) ?
+			fg.getVertices("dl_addr",macAddr, IDeviceObject.class).iterator().next() : null;
 	}
 
-	@Override
+	/**
+	 * Get all devices.
+	 */
 	public Iterable<IDeviceObject> getDevices() {
 		FramedGraph<TitanGraph> fg = conn.getFramedGraph();	
 		return fg != null ? fg.getVertices("type","device",IDeviceObject.class) : null;
 	}
 
-	@Override
+	/**
+	 * Remove the specified device.
+	 * @param dev a device object to remove
+	 */
 	public void removeDevice(IDeviceObject dev) {
 		FramedGraph<TitanGraph> fg = conn.getFramedGraph();	
 		if (fg != null) fg.removeVertex(dev.asVertex());		
 	}
 
-	@Override
+	/**
+	 * Create and return a flow path object.
+	 */
 	public IFlowPath newFlowPath() {
 		FramedGraph<TitanGraph> fg = conn.getFramedGraph();	
 		IFlowPath flowPath = fg.addVertex(null, IFlowPath.class);
@@ -199,7 +242,10 @@
 		return flowPath;
 	}
 
-	@Override
+	/**
+	 * Search and get a flow path object with specified flow ID.
+	 * @param flowId flow ID to search
+	 */
 	public IFlowPath searchFlowPath(FlowId flowId) {
 		FramedGraph<TitanGraph> fg = conn.getFramedGraph();
 		
@@ -208,9 +254,11 @@
 				   IFlowPath.class).iterator().next() : null;
 	}
 
-	@Override
+	/**
+	 * Get a flow path object with a flow entry.
+	 * @param flowEntry flow entry object
+	 */
 	public IFlowPath getFlowPathByFlowEntry(IFlowEntry flowEntry) {
-		FramedGraph<TitanGraph> fg = conn.getFramedGraph();
 		GremlinPipeline<Vertex, IFlowPath> pipe = new GremlinPipeline<Vertex, IFlowPath>();
 		pipe.start(flowEntry.asVertex());
 		pipe.out("flow");
@@ -218,7 +266,9 @@
 		return r.iterator().hasNext() ? r.iterator().next() : null;
 	}
 
-	@Override
+	/**
+	 * Get all flow path objects.
+	 */
     public Iterable<IFlowPath> getAllFlowPaths() {
 		FramedGraph<TitanGraph> fg = conn.getFramedGraph();
 		Iterable<IFlowPath> flowPaths = fg.getVertices("type", "flow", IFlowPath.class);
@@ -233,13 +283,18 @@
 		return nonNullFlows;
 	}
 
-	@Override
+    /**
+     * Remove the specified flow path.
+     * @param flowPath flow path object to remove
+     */
 	public void removeFlowPath(IFlowPath flowPath) {
 		FramedGraph<TitanGraph> fg = conn.getFramedGraph();
 		fg.removeVertex(flowPath.asVertex());
 	}
 
-	@Override
+	/**
+	 * Create and return a flow entry object.
+	 */
 	public IFlowEntry newFlowEntry() {
 		FramedGraph<TitanGraph> fg = conn.getFramedGraph();	
 		IFlowEntry flowEntry = fg.addVertex(null, IFlowEntry.class);
@@ -247,7 +302,10 @@
 		return flowEntry;
 	}
 
-	@Override
+	/**
+	 * Search and get a flow entry object with flow entry ID.
+	 * @param flowEntryId flow entry ID to search
+	 */
 	public IFlowEntry searchFlowEntry(FlowEntryId flowEntryId) {
 		FramedGraph<TitanGraph> fg = conn.getFramedGraph();
 		
@@ -256,31 +314,48 @@
 				   IFlowEntry.class).iterator().next() : null;
 	}
 
-	@Override
-        public Iterable<IFlowEntry> getAllFlowEntries() {
+	/**
+	 * Get all flow entry objects.
+	 */
+	public Iterable<IFlowEntry> getAllFlowEntries() {
 		FramedGraph<TitanGraph> fg = conn.getFramedGraph();
 		
 		return fg.getVertices("type", "flow_entry", IFlowEntry.class);
 	}
 
-	@Override
+	/**
+	 * Remove the specified flow entry.
+	 * @param flowEntry flow entry object to remove
+	 */
 	public void removeFlowEntry(IFlowEntry flowEntry) {
 		FramedGraph<TitanGraph> fg = conn.getFramedGraph();
 		fg.removeVertex(flowEntry.asVertex());
 	}
 	
+	/**
+	 * Get the instance of GraphDBConnection assigned to this class.
+	 */
 	public IDBConnection getDBConnection() {
 		return conn;
 	}
 	
+	/**
+	 * Commit changes for the graph.
+	 */
 	public void commit() {
-		conn.endTx(Transaction.COMMIT);
-	}
-	
-	public void rollback() {
-		conn.endTx(Transaction.ROLLBACK);
+		conn.commit();
 	}
 
+	/**
+	 * Rollback changes for the graph.
+	 */
+	public void rollback() {
+		conn.rollback();
+	}
+
+	/**
+	 * Close the connection of the assigned GraphDBConnection.
+	 */
 	public void close() {
 		conn.close();
 	}
diff --git a/src/main/java/net/onrc/onos/util/IDBConnection.java b/src/main/java/net/onrc/onos/util/IDBConnection.java
index e599a5e..995ce39 100644
--- a/src/main/java/net/onrc/onos/util/IDBConnection.java
+++ b/src/main/java/net/onrc/onos/util/IDBConnection.java
@@ -1,9 +1,5 @@
 package net.onrc.onos.util;
 
-import net.onrc.onos.util.GraphDBConnection.GenerateEvent;
-import net.onrc.onos.util.GraphDBConnection.Transaction;
-import net.onrc.onos.util.GraphDBConnection.TransactionHandle;
-
 import com.thinkaurelius.titan.core.TitanGraph;
 import com.tinkerpop.frames.FramedGraph;
 
@@ -11,9 +7,7 @@
 	public FramedGraph<TitanGraph> getFramedGraph();
 	public void addEventListener(final LocalGraphChangedListener listener);
 	public Boolean isValid();
-	public void startTx();
-	public void endTx(Transaction tx);
-	public void endTx(TransactionHandle tr, Transaction tx);
-	public void endTx(Transaction tx, GenerateEvent fire);
+	public void commit();
+	public void rollback();
 	public void close();
 }
diff --git a/src/main/java/net/onrc/onos/util/IDBOperation.java b/src/main/java/net/onrc/onos/util/IDBOperation.java
index 46245ae..335b08b 100644
--- a/src/main/java/net/onrc/onos/util/IDBOperation.java
+++ b/src/main/java/net/onrc/onos/util/IDBOperation.java
@@ -8,7 +8,7 @@
 import net.onrc.onos.ofcontroller.util.FlowEntryId;
 import net.onrc.onos.ofcontroller.util.FlowId;
 
-public interface IDBOperation {	
+public interface IDBOperation {
 	public ISwitchObject newSwitch(String dpid);
 	public ISwitchObject searchSwitch(String dpid);
 	public ISwitchObject searchActiveSwitch(String dpid);
diff --git a/src/main/resources/META-INF/services/net.floodlightcontroller.core.module.IFloodlightModule b/src/main/resources/META-INF/services/net.floodlightcontroller.core.module.IFloodlightModule
index 3e11180..a9ff0b8 100644
--- a/src/main/resources/META-INF/services/net.floodlightcontroller.core.module.IFloodlightModule
+++ b/src/main/resources/META-INF/services/net.floodlightcontroller.core.module.IFloodlightModule
@@ -1,7 +1,7 @@
 net.floodlightcontroller.core.FloodlightProvider
 net.floodlightcontroller.storage.memory.MemoryStorageSource
 net.floodlightcontroller.devicemanager.internal.DeviceManagerImpl
-net.floodlightcontroller.linkdiscovery.internal.LinkDiscoveryManager
+net.onrc.onos.ofcontroller.linkdiscovery.internal.LinkDiscoveryManager
 net.floodlightcontroller.topology.TopologyManager
 net.floodlightcontroller.forwarding.Forwarding
 net.floodlightcontroller.flowcache.FlowReconcileManager
@@ -17,8 +17,8 @@
 net.floodlightcontroller.devicemanager.test.MockDeviceManager
 net.floodlightcontroller.core.test.MockFloodlightProvider
 net.floodlightcontroller.core.test.MockThreadPoolService
-net.onrc.onos.ofcontroller.onoslistener.OnosPublisher
-net.onrc.onos.ofcontroller.flowcache.FlowManager
+net.onrc.onos.ofcontroller.floodlightlistener.NetworkGraphPublisher
+net.onrc.onos.ofcontroller.flowmanager.FlowManager
 net.onrc.onos.ofcontroller.routing.TopoRouteService
 net.onrc.onos.ofcontroller.bgproute.BgpRoute
 net.onrc.onos.registry.controller.ZookeeperRegistry
diff --git a/src/main/resources/floodlightdefault.properties b/src/main/resources/floodlightdefault.properties
index bf5bad9..8decafb 100644
--- a/src/main/resources/floodlightdefault.properties
+++ b/src/main/resources/floodlightdefault.properties
@@ -6,12 +6,12 @@
 net.floodlightcontroller.counter.CounterStore,\
 net.floodlightcontroller.perfmon.PktInProcessingTime,\
 net.floodlightcontroller.ui.web.StaticWebRoutable,\
-net.onrc.onos.ofcontroller.onoslistener.OnosPublisher, \
+net.onrc.onos.ofcontroller.floodlightlistener.NetworkGraphPublisher, \
 net.onrc.onos.registry.controller.ZookeeperRegistry
 net.floodlightcontroller.restserver.RestApiServer.port = 8080
 net.floodlightcontroller.core.FloodlightProvider.openflowport = 6633
 net.floodlightcontroller.jython.JythonDebugInterface.port = 6655
 net.floodlightcontroller.forwarding.Forwarding.idletimeout = 5
 net.floodlightcontroller.forwarding.Forwarding.hardtimeout = 0
-net.onrc.onos.ofcontroller.onoslistener.OnosPublisher.dbconf = /tmp/cassandra.titan
-net.onrc.onos.ofcontroller.onoslistener.OnosPublisher.EnableCleanup = True
+net.onrc.onos.ofcontroller.floodlightlistener.NetworkGraphPublisher.dbconf = /tmp/cassandra.titan
+net.onrc.onos.ofcontroller.floodlightlistener.NetworkGraphPublisher.EnableCleanup = True
diff --git a/src/test/java/net/floodlightcontroller/core/internal/ControllerTest.java b/src/test/java/net/floodlightcontroller/core/internal/ControllerTest.java
index 05e01a3..88e2d35 100644
--- a/src/test/java/net/floodlightcontroller/core/internal/ControllerTest.java
+++ b/src/test/java/net/floodlightcontroller/core/internal/ControllerTest.java
@@ -69,6 +69,7 @@
 import net.floodlightcontroller.storage.memory.MemoryStorageSource;
 import net.floodlightcontroller.test.FloodlightTestCase;
 import net.floodlightcontroller.threadpool.IThreadPoolService;
+import net.onrc.onos.ofcontroller.core.IOFSwitchPortListener;
 
 import org.easymock.Capture;
 import org.easymock.EasyMock;
@@ -404,7 +405,7 @@
     
     @Test
     public void testUpdateQueue() throws Exception {
-        class DummySwitchListener implements IOFSwitchListener {
+        class DummySwitchListener implements IOFSwitchListener, IOFSwitchPortListener {
             public int nAdded;
             public int nRemoved;
             public int nPortChanged;
@@ -824,7 +825,7 @@
         state.firstRoleReplyReceived = false;
         controller.role = Role.SLAVE;
         expect(chdlr.sw.checkFirstPendingRoleRequestXid(xid)).andReturn(true);
-        chdlr.sw.deliverRoleRequestNotSupported(xid);
+        chdlr.sw.deliverRoleRequestNotSupportedEx(xid);
         expect(chdlr.sw.getChannel()).andReturn(ch).anyTimes();
         expect(ch.close()).andReturn(null);
         
@@ -844,7 +845,7 @@
         state.firstRoleReplyReceived = false;
         controller.role = Role.SLAVE;
         expect(chdlr.sw.checkFirstPendingRoleRequestXid(xid)).andReturn(true);
-        chdlr.sw.deliverRoleRequestNotSupported(xid);
+        chdlr.sw.deliverRoleRequestNotSupportedEx(xid);
         expect(chdlr.sw.getChannel()).andReturn(ch).anyTimes();
         expect(ch.close()).andReturn(null);
         replay(ch, chdlr.sw);
@@ -863,7 +864,7 @@
         state.firstRoleReplyReceived = false;
         controller.role = Role.MASTER;
         expect(chdlr.sw.checkFirstPendingRoleRequestXid(xid)).andReturn(true);
-        chdlr.sw.deliverRoleRequestNotSupported(xid);
+        chdlr.sw.deliverRoleRequestNotSupportedEx(xid);
         setupSwitchForAddSwitch(chdlr.sw, 0L);
         chdlr.sw.clearAllFlowMods();
         replay(ch, chdlr.sw);
diff --git a/src/test/java/net/floodlightcontroller/core/internal/OFSwitchImplTest.java b/src/test/java/net/floodlightcontroller/core/internal/OFSwitchImplTest.java
index 758cd05..128c09f 100644
--- a/src/test/java/net/floodlightcontroller/core/internal/OFSwitchImplTest.java
+++ b/src/test/java/net/floodlightcontroller/core/internal/OFSwitchImplTest.java
@@ -197,7 +197,7 @@
         sw.role = Role.SLAVE;
         sw.pendingRoleRequests.add(pending);
         replay(sw.channel);
-        sw.deliverRoleRequestNotSupported(pending.xid);
+        sw.deliverRoleRequestNotSupportedEx(pending.xid);
         verify(sw.channel);
         assertEquals(false, sw.getAttribute(IOFSwitch.SWITCH_SUPPORTS_NX_ROLE));
         assertEquals(null, sw.role);
@@ -210,7 +210,7 @@
         sw.role = Role.SLAVE;
         expect(sw.channel.close()).andReturn(null);
         replay(sw.channel);
-        sw.deliverRoleRequestNotSupported(1);
+        sw.deliverRoleRequestNotSupportedEx(1);
         verify(sw.channel);
         assertEquals(null, sw.role);
         assertEquals(0, sw.pendingRoleRequests.size());
@@ -228,7 +228,7 @@
         sw.pendingRoleRequests.add(pending);
         expect(sw.channel.close()).andReturn(null);
         replay(sw.channel);
-        sw.deliverRoleRequestNotSupported(pending.xid+1);
+        sw.deliverRoleRequestNotSupportedEx(pending.xid+1);
         verify(sw.channel);
         assertEquals(null, sw.role);
         assertEquals(0, sw.pendingRoleRequests.size());
diff --git a/src/test/java/net/floodlightcontroller/linkdiscovery/internal/LinkStorageImplTest.java b/src/test/java/net/floodlightcontroller/linkdiscovery/internal/LinkStorageImplTest.java
deleted file mode 100644
index 857d091..0000000
--- a/src/test/java/net/floodlightcontroller/linkdiscovery/internal/LinkStorageImplTest.java
+++ /dev/null
@@ -1,129 +0,0 @@
-package net.floodlightcontroller.linkdiscovery.internal;
-
-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertFalse;
-import static org.junit.Assert.assertTrue;
-
-import java.util.Iterator;
-import java.util.List;
-
-import net.floodlightcontroller.core.internal.TestDatabaseManager;
-import net.floodlightcontroller.routing.Link;
-import net.onrc.onos.ofcontroller.core.INetMapStorage.DM_OPERATION;
-import net.onrc.onos.ofcontroller.linkdiscovery.ILinkStorage;
-
-import org.junit.After;
-import org.junit.Before;
-import org.junit.Ignore;
-import org.junit.Test;
-
-import com.thinkaurelius.titan.core.TitanGraph;
-import com.tinkerpop.blueprints.Vertex;
-import com.tinkerpop.gremlin.java.GremlinPipeline;
-
-public class LinkStorageImplTest {
-	private static ILinkStorage linkStorage;
-	private static TitanGraph titanGraph;
-	
-	//TODO Future ideas:
-	//Test add links with CREATE and UPDATE
-	//Test adding existing link again
-	
-	@Before
-	public void setUp() throws Exception{
-		titanGraph = TestDatabaseManager.getTestDatabase();
-		TestDatabaseManager.populateTestData(titanGraph);
-		
-		linkStorage = new TestableLinkStorageImpl(titanGraph);
-	}
-	
-	@After
-	public void tearDown() throws Exception {		
-		titanGraph.shutdown();
-	}
-	
-	/*
-	 * Add a link between port 1.102 and 2.104
-	 * i.e SEA switch port 3 to LAX switch port 1
-	 */
-	@Test
-	public void testAddSingleLink(){
-		Link linkToAdd = new Link(Long.decode("0x0000000000000a01"), 3, Long.decode("0x0000000000000a02"), 1);
-		
-		//Use the link storage API to add the link
-		linkStorage.update(linkToAdd, ILinkStorage.DM_OPERATION.INSERT);
-		
-		//Test if it was added correctly with the Gremlin API
-		GremlinPipeline<Vertex, Vertex> pipe = new GremlinPipeline<Vertex, Vertex>();
-		Iterator<Vertex> it = titanGraph.getVertices("dpid", "00:00:00:00:00:00:0a:01").iterator();
-		
-		assertTrue(it.hasNext());
-		Vertex sw1 = it.next();
-		assertFalse(it.hasNext());
-		
-		pipe.start(sw1).out("on").has("number", (short)3).out("link").in("on");
-		
-		assertTrue(pipe.hasNext());
-		Vertex sw2 = pipe.next();
-		assertFalse(pipe.hasNext());
-		
-		//Check we ended up at the right vertex
-		assertEquals((String)sw2.getProperty("dpid"), "00:00:00:00:00:00:0a:02");
-	}
-	
-	//TODO enable once method is written
-	@Ignore @Test
-	public void testGetLinks(){
-		//TODO Make sure this works when the implementation is written
-		List<Link> list = linkStorage.getLinks(Long.decode("0x0000000000000a01"), (short)2);
-		
-		assertEquals(list.size(), 1);
-		
-		Link l = list.get(0);
-		assertEquals(l.getSrc(), 2561L);
-		assertEquals(l.getSrcPort(), (short)2);
-		assertEquals(l.getDst(), 2563L);
-		assertEquals(l.getDstPort(), (short)1);
-	}
-	
-	//TODO enable once method is written
-	@Ignore @Test
-	public void testUpdateDelete(){
-		Link linkToDelete = new Link(Long.decode("0x0000000000000a01"), 2, Long.decode("0x0000000000000a03"), 1);
-		
-		linkStorage.update(linkToDelete, DM_OPERATION.DELETE);
-		
-		//Test if it was deleted correctly with the Gremlin API
-		GremlinPipeline<Vertex, Vertex> pipe = new GremlinPipeline<Vertex, Vertex>();
-		Iterator<Vertex> it = titanGraph.getVertices("dpid", "00:00:00:00:00:00:0a:01").iterator();
-		
-		assertTrue(it.hasNext());
-		Vertex sw1 = it.next();
-		assertFalse(it.hasNext());
-		
-		pipe.start(sw1).out("on").has("number", 2).out("link");
-		
-		assertFalse(pipe.hasNext());
-	}
-	
-	//TODO enable once method is written
-	@Ignore @Test
-	public void testDeleteLinks(){
-		//TODO Make sure this works when the implementation is written
-		
-		linkStorage.deleteLinksOnPort(Long.decode("0x0000000000000a01"), (short)2);
-		
-		//Test if it was deleted correctly with the Gremlin API
-		GremlinPipeline<Vertex, Vertex> pipe = new GremlinPipeline<Vertex, Vertex>();
-		Iterator<Vertex> it = titanGraph.getVertices("dpid", "00:00:00:00:00:00:0a:01").iterator();
-		
-		assertTrue(it.hasNext());
-		Vertex sw1 = it.next();
-		assertFalse(it.hasNext());
-		
-		pipe.start(sw1).out("on").has("number", 2).out("link");
-		
-		assertFalse(pipe.hasNext());
-	}
-	
-}
diff --git a/src/test/java/net/floodlightcontroller/topology/TopologyInstanceTest.java b/src/test/java/net/floodlightcontroller/topology/TopologyInstanceTest.java
index e72179d..9232bb5 100644
--- a/src/test/java/net/floodlightcontroller/topology/TopologyInstanceTest.java
+++ b/src/test/java/net/floodlightcontroller/topology/TopologyInstanceTest.java
@@ -11,11 +11,11 @@
 import net.floodlightcontroller.core.module.FloodlightModuleContext;
 import net.floodlightcontroller.core.test.MockFloodlightProvider;
 import net.floodlightcontroller.core.test.MockThreadPoolService;
-import net.floodlightcontroller.linkdiscovery.ILinkDiscovery;
 import net.floodlightcontroller.threadpool.IThreadPoolService;
 import net.floodlightcontroller.topology.NodePortTuple;
 import net.floodlightcontroller.topology.TopologyInstance;
 import net.floodlightcontroller.topology.TopologyManager;
+import net.onrc.onos.ofcontroller.linkdiscovery.ILinkDiscovery;
 
 import org.junit.Before;
 import org.junit.Test;
diff --git a/src/test/java/net/floodlightcontroller/topology/TopologyManagerTest.java b/src/test/java/net/floodlightcontroller/topology/TopologyManagerTest.java
index 113cecb..1cf344d 100644
--- a/src/test/java/net/floodlightcontroller/topology/TopologyManagerTest.java
+++ b/src/test/java/net/floodlightcontroller/topology/TopologyManagerTest.java
@@ -4,10 +4,10 @@
 import net.floodlightcontroller.core.IFloodlightProviderService.Role;
 import net.floodlightcontroller.core.module.FloodlightModuleContext;
 import net.floodlightcontroller.core.test.MockThreadPoolService;
-import net.floodlightcontroller.linkdiscovery.ILinkDiscovery;
 import net.floodlightcontroller.test.FloodlightTestCase;
 import net.floodlightcontroller.threadpool.IThreadPoolService;
 import net.floodlightcontroller.topology.TopologyManager;
+import net.onrc.onos.ofcontroller.linkdiscovery.ILinkDiscovery;
 
 import org.junit.Before;
 import org.junit.Test;
diff --git a/src/test/java/net/floodlightcontroller/util/OFMessageDamperMockSwitch.java b/src/test/java/net/floodlightcontroller/util/OFMessageDamperMockSwitch.java
index ffabf6f..59e0a51 100644
--- a/src/test/java/net/floodlightcontroller/util/OFMessageDamperMockSwitch.java
+++ b/src/test/java/net/floodlightcontroller/util/OFMessageDamperMockSwitch.java
@@ -346,10 +346,4 @@
         return 0;
     }
 
-	@Override
-	public void setupRemoteSwitch(Long dpid) {
-		// TODO Auto-generated method stub
-		
-	}
-
 }
\ No newline at end of file
diff --git a/src/test/java/net/onrc/onos/ofcontroller/core/internal/LinkStorageImplTest.java b/src/test/java/net/onrc/onos/ofcontroller/core/internal/LinkStorageImplTest.java
new file mode 100644
index 0000000..7bf2b1a
--- /dev/null
+++ b/src/test/java/net/onrc/onos/ofcontroller/core/internal/LinkStorageImplTest.java
@@ -0,0 +1,536 @@
+package net.onrc.onos.ofcontroller.core.internal;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import net.floodlightcontroller.routing.Link;
+import net.onrc.onos.ofcontroller.core.ILinkStorage;
+import net.onrc.onos.ofcontroller.core.INetMapStorage.DM_OPERATION;
+import net.onrc.onos.ofcontroller.core.internal.TestableGraphDBOperation.TestPortObject;
+import net.onrc.onos.util.GraphDBConnection;
+import net.onrc.onos.util.GraphDBOperation;
+import net.onrc.onos.ofcontroller.linkdiscovery.LinkInfo;
+
+import org.easymock.EasyMock;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Ignore;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.openflow.protocol.OFPhysicalPort;
+import org.openflow.util.HexString;
+import org.powermock.api.easymock.PowerMock;
+import org.powermock.core.classloader.annotations.PrepareForTest;
+import org.powermock.modules.junit4.PowerMockRunner;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+@RunWith(PowerMockRunner.class)
+@PrepareForTest({LinkStorageImpl.class, GraphDBConnection.class, GraphDBOperation.class})
+public class LinkStorageImplTest {
+	protected static Logger log = LoggerFactory.getLogger(LinkStorageImplTest.class);
+
+	private static ILinkStorage linkStorage;
+	
+	// Mock GraphDBConnection (do nothing)
+	private static GraphDBConnection conn;
+	
+	// Mock GraphDBOperation (mocks port-related methods only)
+	private static TestableGraphDBOperation ope;
+
+	/**
+	 * Setup code called before each tests.
+	 * Read test graph data and replace DB access by test graph data.
+	 * @throws Exception
+	 */
+	@Before
+	public void setUp() throws Exception{
+		PowerMock.mockStatic(GraphDBConnection.class);
+		PowerMock.suppress(PowerMock.constructor(GraphDBConnection.class));
+		conn = PowerMock.createNiceMock(GraphDBConnection.class);
+		EasyMock.expect(GraphDBConnection.getInstance((String)EasyMock.anyObject())).andReturn(conn).anyTimes();
+		PowerMock.replay(GraphDBConnection.class);
+		
+		ope = new TestableGraphDBOperation();
+		PowerMock.expectNew(GraphDBOperation.class, (GraphDBConnection)EasyMock.anyObject()).andReturn(ope).anyTimes();
+		PowerMock.replay(GraphDBOperation.class);
+
+		linkStorage = new LinkStorageImpl();
+		linkStorage.init("/dummy/path/to/conf");
+		
+		initLinks();
+	}
+	
+	/**
+	 * Closing code called after each tests.
+	 * Discard test graph data.
+	 * @throws Exception
+	 */
+	@After
+	public void tearDown() throws Exception {
+		// finish code
+		linkStorage.close();
+		ope.close();
+	}
+	
+	// TODO: remove @Ignore after UPDATE method is implemented
+	/**
+	 * Test if update() can correctly updates LinkInfo for a Link.
+	 */
+	@Ignore @Test
+	public void testUpdate_UpdateSingleLink() {
+		Link linkToUpdate= createExistingLink();
+		long currentTime = System.currentTimeMillis();
+		LinkInfo infoToUpdate = createFeasibleLinkInfo(currentTime);
+		LinkInfo infoToVerify = createFeasibleLinkInfo(currentTime);
+
+		linkStorage.update(linkToUpdate, infoToUpdate, ILinkStorage.DM_OPERATION.UPDATE);
+		
+		doTestLinkHasStateOf(linkToUpdate, infoToVerify);
+	}
+	
+	/**
+	 * Test if update() can correctly creates a Link.
+	 */
+	@Test
+	public void testUpdate_CreateSingleLink() {
+		Link linkToCreate = createFeasibleLink();
+		Link linkToVerify = createFeasibleLink();
+		
+		//Use the link storage API to add the link
+		linkStorage.update(linkToCreate, ILinkStorage.DM_OPERATION.CREATE);
+		doTestLinkExist(linkToVerify);
+	}
+
+	/**
+	 * Test if update() can correctly inserts a Link.
+	 */
+	@Test
+	public void testUpdate_InsertSingleLink(){
+		Link linkToInsert = createFeasibleLink();
+		Link linkToVerify = createFeasibleLink();
+		
+		//Use the link storage API to add the link
+		linkStorage.update(linkToInsert, ILinkStorage.DM_OPERATION.INSERT);
+		doTestLinkExist(linkToVerify);
+	}
+	
+	/**
+	 * Test if update() can correctly deletes a Link.
+	 */
+	@Test
+	public void testUpdate_DeleteSingleLink(){
+		Link linkToDelete = createExistingLink();
+		Link linkToVerify = createExistingLink();
+
+		// Test deletion of existing link
+		linkStorage.update(linkToDelete, DM_OPERATION.DELETE);
+		doTestLinkNotExist(linkToVerify);
+	}
+
+	/**
+	 * Test if update() can correctly creates multiple Links.
+	 */
+	@Test
+	public void testUpdate_CreateLinks(){
+		List<Link> linksToCreate = createFeasibleLinks();
+		List<Link> linksToVerify = createFeasibleLinks();
+
+		// Test creation of new links
+		linkStorage.update(linksToCreate, ILinkStorage.DM_OPERATION.CREATE);
+		for(Link l : linksToVerify) {
+			doTestLinkExist(l);
+		}
+	}
+	
+	/**
+	 * Test if update() can handle mixture of normal/abnormal input for creation of Links.
+	 * Deprecated: DBOperation is responsible.
+	 */
+	@Ignore @Test
+	public void testUpdate_CreateLinks_Mixuture(){
+		List<Link> linksToCreate = new ArrayList<Link>();
+		linksToCreate.add(createFeasibleLink());
+		linksToCreate.add(createExistingLink());
+		
+		// Test creation of mixture of new/existing links
+		linkStorage.update(linksToCreate, ILinkStorage.DM_OPERATION.CREATE);
+		doTestLinkExist(createFeasibleLink());
+		doTestLinkExist(createExistingLink());
+	}
+
+	/**
+	 * Test if update() can correctly inserts multiple Links.
+	 */
+	@Test
+	public void testUpdate_InsertLinks(){
+		List<Link> linksToInsert = createFeasibleLinks();
+		List<Link> linksToVerify = createFeasibleLinks();
+		
+		// Test insertion of new links
+		linkStorage.update(linksToInsert, ILinkStorage.DM_OPERATION.INSERT);
+		for(Link l : linksToVerify) {
+			doTestLinkExist(l);
+		}
+	}
+	
+	/**
+	 * Test if update() can handle mixture of normal/abnormal input for creation of Links.
+	 */
+	@Ignore @Test
+	public void testUpdate_InsertLinks_Mixuture(){
+		List<Link> linksToInsert = new ArrayList<Link>();
+		linksToInsert.add(createFeasibleLink());
+		linksToInsert.add(createExistingLink());
+		
+		// Test insertion of mixture of new/existing links
+		linkStorage.update(linksToInsert, ILinkStorage.DM_OPERATION.INSERT);
+		doTestLinkExist(createFeasibleLink());
+		doTestLinkExist(createExistingLink());
+	}
+
+	/**
+	 * Test if update() can correctly deletes multiple Links.
+	 */
+	@Test
+	public void testUpdate_DeleteLinks(){
+		List<Link> linksToDelete = createExistingLinks();
+		List<Link> linksToVerify = createExistingLinks();
+		
+		// Test deletion of existing links
+		linkStorage.update(linksToDelete, ILinkStorage.DM_OPERATION.DELETE);
+		for(Link l : linksToVerify) {
+			doTestLinkNotExist(l);
+		}
+	}
+	
+	/**
+	 * Test if update() can handle mixture of normal/abnormal input for deletion of Links.
+	 */
+	@Ignore @Test
+	public void testUpdate_DeleteLinks_Mixuture(){
+		List<Link> linksToDelete = new ArrayList<Link>();
+		linksToDelete.add(createFeasibleLink());
+		linksToDelete.add(createExistingLink());
+		
+		// Test deletion of mixture of new/existing links
+		linkStorage.update(linksToDelete, ILinkStorage.DM_OPERATION.DELETE);
+		doTestLinkNotExist(createFeasibleLink());
+		doTestLinkNotExist(createExistingLink());
+	}
+	
+	// TODO: remove @Ignore after UPDATE method is implemented
+	/**
+	 * Test if updateLink() can correctly updates LinkInfo for a Link.
+	 */
+	@Ignore @Test
+	public void testUpdateLink_Update() {
+		Link linkToUpdate= createExistingLink();
+		long currentTime = System.currentTimeMillis();
+		LinkInfo infoToUpdate = createFeasibleLinkInfo(currentTime);
+		LinkInfo infoToVerify = createFeasibleLinkInfo(currentTime);
+
+		linkStorage.updateLink(linkToUpdate, infoToUpdate, ILinkStorage.DM_OPERATION.UPDATE);
+		
+		doTestLinkHasStateOf(linkToUpdate, infoToVerify);
+	}
+	
+	/**
+	 * Test if updateLink() can correctly creates a Link.
+	 */
+	@Test
+	public void testUpdateLink_Create() {
+		Link linkToCreate = createFeasibleLink();
+		Link linkToVerify = createFeasibleLink();
+		
+		//Use the link storage API to add the link
+		linkStorage.updateLink(linkToCreate, null, ILinkStorage.DM_OPERATION.CREATE);
+		doTestLinkExist(linkToVerify);
+	}
+	
+	/**
+	 * Test if updateLink() can correctly inserts a Link.
+	 */
+	@Test
+	public void testUpdateLink_Insert() {
+		Link linkToInsert = createFeasibleLink();
+		Link linkToVerify = createFeasibleLink();
+		
+		//Use the link storage API to add the link
+		linkStorage.updateLink(linkToInsert, null, ILinkStorage.DM_OPERATION.INSERT);
+
+		doTestLinkExist(linkToVerify);
+	}
+	
+	// TODO: Check if addOrUpdateLink() should accept DELETE operation. If not, remove this test.
+	/**
+	 * Test if updateLink() can correctly deletes a Link.
+	 */
+	@Ignore @Test
+	public void testUpdateLink_Delete() {
+		Link linkToDelete = createExistingLink();
+		Link linkToVerify = createExistingLink();
+
+		// Test deletion of existing link
+		linkStorage.updateLink(linkToDelete, null, DM_OPERATION.DELETE);
+		doTestLinkNotExist(linkToVerify);
+		
+		linkToDelete = createFeasibleLink();
+		linkToVerify = createFeasibleLink();
+
+		// Test deletion of not-existing link
+		linkStorage.updateLink(linkToDelete, null, DM_OPERATION.DELETE);
+		doTestLinkNotExist(linkToVerify);
+	}
+	
+	/**
+	 * Test if getLinks() can correctly return Links connected to specific DPID and port.
+	 */
+	@Test
+	public void testGetLinks_ByDpidPort(){
+		Link linkToVerify = createExistingLink();
+		Long dpid = linkToVerify.getSrc();
+		short port = (short)linkToVerify.getSrcPort();
+		
+		List<Link> list = linkStorage.getLinks(dpid, port);
+		
+		assertEquals(list.size(), 1);
+		
+		Link l = list.get(0);
+		assertEquals(l.getSrc(), linkToVerify.getSrc());
+		assertEquals(l.getSrcPort(), linkToVerify.getSrcPort());
+		assertEquals(l.getDst(), linkToVerify.getDst());
+		assertEquals(l.getDstPort(), linkToVerify.getDstPort());
+		
+		Link linkToVerifyNot = createFeasibleLink();
+		
+		List<Link> list2 = linkStorage.getLinks(linkToVerifyNot.getSrc(), (short)linkToVerifyNot.getSrcPort());
+		
+		assertEquals(list2.size(), 0);
+	}
+	
+	/**
+	 * Test if getLinks() can correctly return Links connected to specific MAC address.
+	 */
+	@Test
+	public void testGetLinks_ByString() {
+		Link linkToVeryfy = createExistingLink();
+		String dpid = HexString.toHexString(linkToVeryfy.getSrc());
+		
+		List<Link> links = linkStorage.getLinks(dpid);
+		assertTrue(links.contains(linkToVeryfy));
+
+		Link linkToVerifyNot = createFeasibleLink();
+		assertFalse(links.contains(linkToVerifyNot));
+	}
+	
+	/**
+	 * Test if deleteLink() can correctly delete a Link.
+	 */
+	@Test
+	public void testDeleteLink() {
+		// Deletion of existing link
+		Link linkToDelete = createExistingLink();
+		Link linkToVerify = createExistingLink();
+		
+		linkStorage.deleteLink(linkToDelete);
+		doTestLinkNotExist(linkToVerify);
+	}
+	
+	/**
+	 * Test if deleteLinks() can correctly delete Links.
+	 */
+	@Test
+	public void testDeleteLinks(){
+		List<Link> linksToDelete = createExistingLinks();
+		List<Link> linksToVerify = createExistingLinks();
+		
+		linkStorage.deleteLinks(linksToDelete);
+		for(Link l : linksToVerify) {
+			doTestLinkNotExist(l);
+		}
+	}
+	
+	/**
+	 * Test if deleteLinks() can handle mixture of normal/abnormal input.
+	 */
+	@Ignore @Test
+	public void testDeleteLinks_Mixture(){
+		List<Link> linksToDelete = new ArrayList<Link>();
+		linksToDelete.add(createFeasibleLink());
+		linksToDelete.add(createExistingLink());
+		
+		// Test deletion of mixture of new/existing links
+		linkStorage.deleteLinks(linksToDelete);
+		doTestLinkNotExist(createFeasibleLink());
+		doTestLinkNotExist(createExistingLink());
+	}
+
+	/**
+	 * Test if getActiveLinks() can correctly return active Links.
+	 */
+	@Test
+	public void testGetActiveLinks() {
+		Link existingLink = createExistingLink();
+		Link notExistingLink = createFeasibleLink();
+
+		List<Link> links = linkStorage.getActiveLinks();
+		
+		assertTrue(links.contains(existingLink));
+		assertFalse(links.contains(notExistingLink));
+	}
+	
+	/**
+	 * Test if deleteLinksOnPort() can delete Links.
+	 */
+	@Test
+	public void testDeleteLinksOnPort() {
+		Link linkToDelete = createExistingLink();
+		Link linkToVerify = createExistingLink();
+		
+		linkStorage.deleteLinksOnPort(linkToDelete.getSrc(), linkToDelete.getSrcPort());
+		
+		doTestLinkNotExist(linkToVerify);
+	}
+
+	/**
+	 * Test if specific link is existing
+	 * @param link 
+	 */
+	private void doTestLinkExist(Link link) {
+		assertTrue(ope.hasLinkBetween(HexString.toHexString(link.getSrc()),
+				link.getSrcPort(),
+				HexString.toHexString(link.getDst()),
+				link.getDstPort()));
+	}
+	
+	/**
+	 * Test if titanGraph doesn't have specific link
+	 * @param link
+	 */
+	private void doTestLinkNotExist(Link link) {
+		assertFalse(ope.hasLinkBetween(HexString.toHexString(link.getSrc()),
+				link.getSrcPort(),
+				HexString.toHexString(link.getDst()),
+				link.getDstPort()));
+	}
+	
+	/**
+	 * Test if titanGraph has specific Link with specific LinkInfo
+	 * @param link 
+	 */
+	private void doTestLinkHasStateOf(Link link, LinkInfo info) {
+	}
+	
+	//----------------- Creation of test data -----------------------
+	// Assume a network shown below.
+	//
+	// [dpid1]--+--[port:1]----[port:1]--+--[dpid2]
+	//          |                        |
+	//          +--[port:2]    [port:2]--+
+	//          |
+	//          +--[port:3]    [port:1]--+--[dpid3]
+	//          |                        |
+	//          +--[port:4]----[port:2]--+
+	//
+	// dpid1 : 00:00:00:00:0a:01
+	// dpid2 : 00:00:00:00:0a:02
+	// dpid3 : 00:00:00:00:0a:03
+	
+	private void initLinks() {
+		final String dpid1 = "00:00:00:00:0a:01";
+		final String dpid2 = "00:00:00:00:0a:02";
+		final String dpid3 = "00:00:00:00:0a:03";
+		
+		ope.createNewSwitchForTest(dpid1).setStateForTest("ACTIVE");
+		ope.createNewSwitchForTest(dpid2).setStateForTest("ACTIVE");
+		ope.createNewSwitchForTest(dpid3).setStateForTest("ACTIVE");
+
+		TestPortObject ports1 [] = {
+				ope.createNewPortForTest(dpid1, (short)1),
+				ope.createNewPortForTest(dpid1, (short)2),
+				ope.createNewPortForTest(dpid1, (short)3),
+				ope.createNewPortForTest(dpid1, (short)4),
+		};
+
+		TestPortObject ports2 [] = {
+				ope.createNewPortForTest(dpid2, (short)1),
+				ope.createNewPortForTest(dpid2, (short)2),
+		};
+
+		TestPortObject ports3 [] = {
+				ope.createNewPortForTest(dpid3, (short)1),
+				ope.createNewPortForTest(dpid3, (short)2),
+		};
+		
+		ope.setLinkBetweenPortsForTest(ports1[0], ports2[0]);
+		ope.setLinkBetweenPortsForTest(ports1[3], ports3[1]);
+	}
+	
+	/**
+	 * Returns new Link object of existing link
+	 * @return new Link object
+	 */
+	private Link createExistingLink() {
+		return new Link(Long.decode("0x0000000000000a01"), 1, Long.decode("0x0000000000000a02"), 1);
+	}
+	
+	/**
+	 * Returns new Link object of not-existing but feasible link
+	 * @return new Link object
+	 */
+	private Link createFeasibleLink() {
+		return new Link(Long.decode("0x0000000000000a01"), 3, Long.decode("0x0000000000000a03"), 1);
+	}
+	
+	// make NO sense while test-network data doesn't define physical network (i.e. any link is feasible)
+	@SuppressWarnings("unused")
+	private Link createInfeasibleLink() {
+		return new Link(Long.decode("0x0000000000000a01"), 1, Long.decode("0x0000000000000a03"), 3);
+	}
+
+	/**
+	 * Returns list of Link objects which all has information of existing link in titanGraph
+	 * @return ArrayList of new Link objects
+	 */
+	private List<Link> createExistingLinks() {
+		List<Link> links = new ArrayList<Link>();
+		links.add(new Link(Long.decode("0x0000000000000a01"), 1, Long.decode("0x0000000000000a02"), 1));
+		links.add(new Link(Long.decode("0x0000000000000a01"), 4, Long.decode("0x0000000000000a03"), 2));
+		return links;
+	}
+	
+	/**
+	 * Returns list of Link objects which all has information of not-existing but feasible link
+	 * @return ArrayList of new Link objects
+	 */
+	private List<Link> createFeasibleLinks() {
+		List<Link> links = new ArrayList<Link>();
+		links.add(new Link(Long.decode("0x0000000000000a01"), 2, Long.decode("0x0000000000000a02"), 2));
+		links.add(new Link(Long.decode("0x0000000000000a01"), 3, Long.decode("0x0000000000000a03"), 1));
+		return links;
+	}
+	
+	/**
+	 * Returns new LinkInfo object with convenient values.
+	 * @return LinkInfo object
+	 */
+	private LinkInfo createFeasibleLinkInfo(long time) {
+		long time_first = time;
+		long time_last_lldp = time + 50;
+		long time_last_bddp = time + 100;
+		int state_src = OFPhysicalPort.OFPortState.OFPPS_STP_FORWARD.getValue();
+		int state_dst = OFPhysicalPort.OFPortState.OFPPS_STP_LISTEN.getValue();
+
+		return new LinkInfo(time_first,
+				time_last_lldp,
+				time_last_bddp,
+				state_src,
+				state_dst);
+	}
+	//---------------------------------------------------------------
+}
diff --git a/src/test/java/net/onrc/onos/ofcontroller/core/internal/SwitchStorageImplTestBB.java b/src/test/java/net/onrc/onos/ofcontroller/core/internal/SwitchStorageImplTestBB.java
index 78594b5..f6f70ae 100644
--- a/src/test/java/net/onrc/onos/ofcontroller/core/internal/SwitchStorageImplTestBB.java
+++ b/src/test/java/net/onrc/onos/ofcontroller/core/internal/SwitchStorageImplTestBB.java
@@ -97,10 +97,10 @@
 	 * Desc:
 	 *  Test method for addSwitch method.
 	 * Condition:
-	 *  The switch status is INACTIVE.
+	 *  The existing switch status is INACTIVE.
+	 *  The switch is already existing.
 	 * Expect:
-	 * 1. Switch should be existing.
-	 * 2. The status of switch should be ACTIVE
+	 * 1. After add the same switch, the status of switch should be ACTIVE
 	 */
 	//@Ignore 
 	@Test
@@ -121,7 +121,9 @@
 	 * Desc:
 	 *  Test method for testUpdate method.
 	 * Condition:
-	 *  We will create a swith with this method.
+	 *  The switch is not existing.
+	 *  The status of added switch is INACTIVE.
+	 *  DM_OPERATION is CREATE.
 	 * Expect:
 	 * 1. Switch should be created.
 	 * 2. The status of switch should be INACTIVE.
@@ -146,6 +148,8 @@
 	 *  Test method for testUpdate method.
 	 * Condition:
 	 *  The switch is existing.
+	 *  The status of added switch is ACTIVE.
+	 *  DM_OPERATION is DELETE.
 	 * Expect:
 	 * 1. Switch should be deleted.
 	 */
@@ -189,7 +193,7 @@
 	 * Condition:
 	 *  The switch is not existing.
 	 * Expect:
-	 * Nothing happends.
+	 * Nothing happens.
 	 */
 	//@Ignore 
 	@Test
@@ -209,7 +213,7 @@
 	 * Condition:
 	 *  The port is existing.
 	 * Expect:
-	 *  Delete the port.
+	 *  Deleted the port.
 	 */
 	//@Ignore 
 	@Test
@@ -247,11 +251,12 @@
 	
 	/**
 	 * Desc:
-	 *  Test method for add method.
+	 *  Test method for add port method.
 	 * Condition:
 	 *  The port is not existing.
 	 * Expect:
 	 *  The port should be added.
+	 *  The desc of IPortObject is the same as the name of OFPhysicalPort.
 	 */
 	//@Ignore 
 	@Test
@@ -270,6 +275,7 @@
 		swSt.addPort(dpid, port);
 		IPortObject portObj = ope.searchPort(dpid, portNumber);
 		assertTrue(portObj != null);
+		assertEquals(portObj.getDesc(), name);
 	}
 	
 	/**
@@ -285,7 +291,7 @@
 	public void testAddExistingPort() {
 		String dpid = "00:00:00:00:00:00:0a:06";
 		short portNumber = 3;
-		String name = "port 3 at ATL Switch";
+		String name = "xxx";
 		int state = OFPortState.OFPPS_STP_FORWARD.getValue();
 		OFPhysicalPort port = new OFPhysicalPort(); 
 		port.setPortNumber(portNumber);
diff --git a/src/test/java/net/onrc/onos/ofcontroller/core/internal/TestDatabaseManager.java b/src/test/java/net/onrc/onos/ofcontroller/core/internal/TestDatabaseManager.java
new file mode 100644
index 0000000..b4cfc31
--- /dev/null
+++ b/src/test/java/net/onrc/onos/ofcontroller/core/internal/TestDatabaseManager.java
@@ -0,0 +1,76 @@
+package net.onrc.onos.ofcontroller.core.internal;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileNotFoundException;
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.Iterator;
+import java.util.Set;
+
+import junit.framework.Assert;
+
+import org.apache.commons.io.FileUtils;
+
+import com.thinkaurelius.titan.core.TitanFactory;
+import com.thinkaurelius.titan.core.TitanGraph;
+import com.tinkerpop.blueprints.TransactionalGraph.Conclusion;
+import com.tinkerpop.blueprints.Vertex;
+import com.tinkerpop.blueprints.util.io.graphml.GraphMLReader;
+
+public class TestDatabaseManager {
+	private static final String testDbLocation = "/tmp/onos-testdb";
+	
+	//private static final String testDbGraphML = "<?xml version=\"1.0\" ?><graphml xmlns=\"http://graphml.graphdrawing.org/xmlns\">    <key id=\"id\" for=\"node\" attr.name=\"id\" attr.type=\"string\"></key>    <key id=\"type\" for=\"node\" attr.name=\"type\" attr.type=\"string\"></key>    <key id=\"dpid\" for=\"node\" attr.name=\"dpid\" attr.type=\"string\"></key>    <key id=\"desc\" for=\"node\" attr.name=\"desc\" attr.type=\"string\"></key>    <key id=\"number\" for=\"node\" attr.name=\"number\" attr.type=\"int\"></key>    <key id=\"dl_addr\" for=\"node\" attr.name=\"dl_addr\" attr.type=\"string\"></key>    <key id=\"nw_addr\" for=\"node\" attr.name=\"nw_addr\" attr.type=\"string\"></key>    <key id=\"id\" for=\"edge\" attr.name=\"id\" attr.type=\"string\"></key>    <key id=\"source\" for=\"edge\" attr.name=\"source\" attr.type=\"string\"></key>    <key id=\"target\" for=\"edge\" attr.name=\"target\" attr.type=\"string\"></key>    <key id=\"label\" for=\"edge\" attr.name=\"label\" attr.type=\"string\"></key>    <graph id=\"G\" edgedefault=\"directed\">        <node id=\"1\">            <data key=\"type\">switch</data>            <data key=\"dpid\">00:00:00:00:00:00:0a:01</data>            <data key=\"desc\">OpenFlow Switch at SEA</data>        </node>        <node id=\"2\">            <data key=\"type\">switch</data>            <data key=\"dpid\">00:00:00:00:00:00:0a:02</data>            <data key=\"desc\">OpenFlow Switch at LAX</data>        </node>        <node id=\"3\">            <data key=\"type\">switch</data>            <data key=\"dpid\">00:00:00:00:00:00:0a:03</data>            <data key=\"desc\">OpenFlow Switch at CHI</data>        </node>        <node id=\"4\">            <data key=\"type\">switch</data>            <data key=\"dpid\">00:00:00:00:00:00:0a:04</data>            <data key=\"desc\">OpenFlow Switch at IAH</data>        </node>        <node id=\"5\">            <data key=\"type\">switch</data>            <data key=\"dpid\">00:00:00:00:00:00:0a:05</data>            <data key=\"desc\">OpenFlow Switch at NYC</data>        </node>        <node id=\"6\">            <data key=\"type\">switch</data>            <data key=\"dpid\">00:00:00:00:00:00:0a:06</data>            <data key=\"desc\">OpenFlow Switch at ATL</data>        </node>        <node id=\"100\">            <data key=\"type\">port</data>            <data key=\"number\">1</data>            <data key=\"desc\">port 1 at SEA Switch</data>        </node>        <node id=\"101\">            <data key=\"type\">port</data>            <data key=\"number\">2</data>            <data key=\"desc\">port 2 at SEA Switch</data>        </node>        <node id=\"102\">            <data key=\"type\">port</data>            <data key=\"number\">3</data>            <data key=\"desc\">port 3 at SEA Switch</data>        </node>        <node id=\"103\">            <data key=\"type\">port</data>            <data key=\"number\">4</data>            <data key=\"desc\">port 4 at SEA Switch</data>        </node>        <node id=\"104\">            <data key=\"type\">port</data>            <data key=\"number\">1</data>            <data key=\"desc\">port 1 at LAX Switch</data>        </node>        <node id=\"105\">            <data key=\"type\">port</data>            <data key=\"number\">2</data>            <data key=\"desc\">port 2 at LAX Switch</data>        </node>        <node id=\"106\">            <data key=\"type\">port</data>            <data key=\"number\">3</data>            <data key=\"desc\">port 3 at LAX Switch</data>        </node>        <node id=\"107\">            <data key=\"type\">port</data>            <data key=\"number\">1</data>            <data key=\"desc\">port 1 at CHI Switch</data>        </node>        <node id=\"108\">            <data key=\"type\">port</data>            <data key=\"number\">2</data>            <data key=\"desc\">port 2 at CHI Switch</data>        </node>        <node id=\"109\">            <data key=\"type\">port</data>            <data key=\"number\">3</data>            <data key=\"desc\">port 3 at CHI Switch</data>        </node>        <node id=\"110\">            <data key=\"type\">port</data>            <data key=\"number\">4</data>            <data key=\"desc\">port 4 at CHI Switch</data>        </node>        <node id=\"111\">            <data key=\"type\">port</data>            <data key=\"number\">1</data>            <data key=\"desc\">port 1 at IAH Switch</data>        </node>        <node id=\"112\">            <data key=\"type\">port</data>            <data key=\"number\">2</data>            <data key=\"desc\">port 2 at IAH Switch</data>        </node>        <node id=\"113\">            <data key=\"type\">port</data>            <data key=\"number\">3</data>            <data key=\"desc\">port 3 at IAH Switch</data>        </node>        <node id=\"114\">            <data key=\"type\">port</data>            <data key=\"number\">1</data>            <data key=\"desc\">port 1 at NYC Switch</data>        </node>        <node id=\"115\">            <data key=\"type\">port</data>            <data key=\"number\">2</data>            <data key=\"desc\">port 2 at NYC Switch</data>        </node>        <node id=\"116\">            <data key=\"type\">port</data>            <data key=\"number\">3</data>            <data key=\"desc\">port 3 at NYC Switch</data>        </node>        <node id=\"117\">            <data key=\"type\">port</data>            <data key=\"number\">1</data>            <data key=\"desc\">port 1 at ATL Switch</data>        </node>        <node id=\"118\">            <data key=\"type\">port</data>            <data key=\"number\">2</data>            <data key=\"desc\">port 2 at ATL Switch</data>        </node>        <node id=\"119\">            <data key=\"type\">port</data>            <data key=\"number\">3</data>            <data key=\"desc\">port 3 at ATL Switch</data>        </node>        <node id=\"1000\">            <data key=\"type\">device</data>            <data key=\"dl_addr\">20:c9:d0:4a:e1:73</data>            <data key=\"nw_addr\">192.168.10.101</data>        </node>        <node id=\"1001\">            <data key=\"type\">device</data>            <data key=\"dl_addr\">20:c9:d0:4a:e1:62</data>            <data key=\"nw_addr\">192.168.20.101</data>        </node>        <node id=\"1002\">            <data key=\"type\">device</data>            <data key=\"dl_addr\">10:40:f3:e6:8d:55</data>            <data key=\"nw_addr\">192.168.10.1</data>        </node>        <node id=\"1003\">            <data key=\"type\">device</data>            <data key=\"dl_addr\">a0:b3:cc:9c:c6:88</data>            <data key=\"nw_addr\">192.168.20.1</data>        </node>        <node id=\"1004\">            <data key=\"type\">device</data>            <data key=\"dl_addr\">00:04:20:e2:50:a2</data>            <data key=\"nw_addr\">192.168.30.1</data>        </node>        <node id=\"1005\">            <data key=\"type\">device</data>            <data key=\"dl_addr\">58:55:ca:c4:1b:a0</data>            <data key=\"nw_addr\">192.168.40.1</data>        </node>        <edge id=\"10000\" source=\"1\" target=\"101\" label=\"on\"></edge>        <edge id=\"10001\" source=\"1\" target=\"102\" label=\"on\"></edge>        <edge id=\"10002\" source=\"1\" target=\"103\" label=\"on\"></edge>        <edge id=\"10003\" source=\"2\" target=\"104\" label=\"on\"></edge>        <edge id=\"10004\" source=\"2\" target=\"105\" label=\"on\"></edge>        <edge id=\"10005\" source=\"2\" target=\"106\" label=\"on\"></edge>        <edge id=\"10006\" source=\"3\" target=\"107\" label=\"on\"></edge>        <edge id=\"10007\" source=\"3\" target=\"108\" label=\"on\"></edge>        <edge id=\"10008\" source=\"3\" target=\"109\" label=\"on\"></edge>        <edge id=\"10009\" source=\"3\" target=\"110\" label=\"on\"></edge>        <edge id=\"10010\" source=\"4\" target=\"111\" label=\"on\"></edge>        <edge id=\"10011\" source=\"4\" target=\"112\" label=\"on\"></edge>        <edge id=\"10012\" source=\"4\" target=\"113\" label=\"on\"></edge>        <edge id=\"10013\" source=\"5\" target=\"114\" label=\"on\"></edge>        <edge id=\"10014\" source=\"5\" target=\"115\" label=\"on\"></edge>        <edge id=\"10015\" source=\"5\" target=\"116\" label=\"on\"></edge>        <edge id=\"10016\" source=\"6\" target=\"117\" label=\"on\"></edge>        <edge id=\"10017\" source=\"6\" target=\"118\" label=\"on\"></edge>        <edge id=\"10018\" source=\"6\" target=\"119\" label=\"on\"></edge>        <edge id=\"11000\" source=\"101\" target=\"107\" label=\"link\"></edge>         <edge id=\"11003\" source=\"105\" target=\"111\" label=\"link\"></edge>        <edge id=\"11004\" source=\"107\" target=\"101\" label=\"link\"></edge>        <edge id=\"11005\" source=\"108\" target=\"112\" label=\"link\"></edge>        <edge id=\"11006\" source=\"109\" target=\"114\" label=\"link\"></edge>        <edge id=\"11007\" source=\"111\" target=\"105\" label=\"link\"></edge>        <edge id=\"11008\" source=\"112\" target=\"108\" label=\"link\"></edge>        <edge id=\"11009\" source=\"113\" target=\"117\" label=\"link\"></edge>        <edge id=\"11010\" source=\"114\" target=\"109\" label=\"link\"></edge>        <edge id=\"11011\" source=\"115\" target=\"118\" label=\"link\"></edge>        <edge id=\"11012\" source=\"117\" target=\"113\" label=\"link\"></edge>        <edge id=\"11013\" source=\"118\" target=\"115\" label=\"link\"></edge>        <edge id=\"12000\" source=\"103\" target=\"1000\" label=\"host\"></edge>        <edge id=\"12001\" source=\"103\" target=\"1001\" label=\"host\"></edge>        <edge id=\"12002\" source=\"110\" target=\"1002\" label=\"host\"></edge>        <edge id=\"12003\" source=\"116\" target=\"1003\" label=\"host\"></edge>        <edge id=\"12004\" source=\"106\" target=\"1004\" label=\"host\"></edge>        <edge id=\"12005\" source=\"119\" target=\"1005\" label=\"host\"></edge>      </graph>    </graphml>";
+	
+	private static final String testDataLocation = "titan/schema/test-network.xml";
+	
+	public static TitanGraph getTestDatabase(){
+		//return TitanFactory.open(testDbLocation);
+//		return TitanFactory.openInMemoryGraph();
+		return TitanFactory.open(testDbLocation);
+	}
+	
+	public static void populateTestData(TitanGraph titanGraph){
+		Set<String> s = titanGraph.getIndexedKeys(Vertex.class);
+        if (!s.contains("dpid")) {
+           titanGraph.createKeyIndex("dpid", Vertex.class);
+           titanGraph.stopTransaction(Conclusion.SUCCESS);
+        }
+        if (!s.contains("type")) {
+        	titanGraph.createKeyIndex("type", Vertex.class);
+        	titanGraph.stopTransaction(Conclusion.SUCCESS);
+        }
+        
+        //InputStream graphMLStream = new ByteArrayInputStream(testDbGraphML.getBytes());
+        
+        try {
+        	InputStream graphMLStream = new FileInputStream(testDataLocation);
+			GraphMLReader.inputGraph(titanGraph, graphMLStream);
+		} catch (FileNotFoundException e) {
+			Assert.fail("Test data file not found: " + testDataLocation);
+		} catch (IOException e) {
+			e.printStackTrace();
+			Assert.fail("IOException thrown");
+		}
+        
+        //Change the type of all port numbers to short in the database
+        Iterator<Vertex> it = titanGraph.getVertices("type", "port").iterator();
+        while (it.hasNext()){
+        	Vertex port = it.next();
+        	Integer portNum = (Integer) port.getProperty("number");
+        	port.setProperty("number", portNum.shortValue());
+        }
+        titanGraph.stopTransaction(Conclusion.SUCCESS);
+	}
+	
+	public static void deleteTestDatabase(){
+		try {
+			FileUtils.deleteDirectory(new File(testDbLocation));
+		} catch (IOException e) {
+			System.out.println("delete failed");
+			e.printStackTrace();
+		}
+	}
+	
+}
\ No newline at end of file
diff --git a/src/test/java/net/onrc/onos/ofcontroller/core/internal/TestableGraphDBOperation.java b/src/test/java/net/onrc/onos/ofcontroller/core/internal/TestableGraphDBOperation.java
new file mode 100644
index 0000000..31a4bb0
--- /dev/null
+++ b/src/test/java/net/onrc/onos/ofcontroller/core/internal/TestableGraphDBOperation.java
@@ -0,0 +1,1331 @@
+package net.onrc.onos.ofcontroller.core.internal;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.easymock.EasyMock;
+import org.openflow.util.HexString;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import com.tinkerpop.blueprints.Vertex;
+import com.tinkerpop.frames.annotations.gremlin.GremlinParam;
+
+import net.onrc.onos.ofcontroller.core.INetMapTopologyObjects.IDeviceObject;
+import net.onrc.onos.ofcontroller.core.INetMapTopologyObjects.IFlowEntry;
+import net.onrc.onos.ofcontroller.core.INetMapTopologyObjects.IFlowPath;
+import net.onrc.onos.ofcontroller.core.INetMapTopologyObjects.IPortObject;
+import net.onrc.onos.ofcontroller.core.INetMapTopologyObjects.ISwitchObject;
+import net.onrc.onos.ofcontroller.util.FlowEntryId;
+import net.onrc.onos.ofcontroller.util.FlowId;
+import net.onrc.onos.util.GraphDBConnection;
+import net.onrc.onos.util.GraphDBOperation;
+import net.onrc.onos.util.IDBConnection;
+
+/**
+ * Mock class of GraphDBOperation which provides additional setter to construct a graph for test.
+ * This object simply caches parameters set up by override interfaces and reflect them when commit().
+ * *ForTest() methods are exempt from cache, parameters through those methods are reflected soon.
+ * @author Naoki Shiota
+ *
+ */
+public class TestableGraphDBOperation extends GraphDBOperation {
+	protected static Logger log = LoggerFactory.getLogger(TestableGraphDBOperation.class);
+
+	protected List<TestSwitchObject> switches;
+	protected List<TestPortObject> ports;
+	protected List<TestDeviceObject> devices;
+	protected List<TestFlowPath> paths;
+	protected List<TestFlowEntry> entries;
+
+	protected List<TestSwitchObject> switchesToAdd;
+	protected List<TestPortObject> portsToAdd;
+	protected List<TestDeviceObject> devicesToAdd;
+	protected List<TestFlowPath> pathsToAdd;
+	protected List<TestFlowEntry> entriesToAdd;
+
+	protected List<TestSwitchObject> switchesToRemove;
+	protected List<TestPortObject> portsToRemove;
+	protected List<TestDeviceObject> devicesToRemove;
+	protected List<TestFlowPath> pathsToRemove;
+	protected List<TestFlowEntry> entriesToRemove;
+
+	// Testable implementations of INetMapTopologyObject interfaces
+
+	public static class TestSwitchObject implements ISwitchObject {
+		private String state,type,dpid;
+		private List<IPortObject> ports;
+		private List<IDeviceObject> devices;
+		private List<IFlowEntry> entries;
+
+		private String stateToUpdate, typeToUpdate, dpidToUpdate;
+		private List<IPortObject> portsToAdd;
+		private List<IPortObject> portsToRemove;
+
+		public TestSwitchObject() {
+			type = "switch";
+			
+			ports = new ArrayList<IPortObject>();
+			portsToAdd = new ArrayList<IPortObject>();
+			portsToRemove = new ArrayList<IPortObject>();
+			devices = new ArrayList<IDeviceObject>();
+			entries = new ArrayList<IFlowEntry>();
+			
+			clearUncommitedData();
+		}
+		
+		public void commit() {
+			for(IPortObject port : portsToAdd) {
+				ports.add(port);
+			}
+			for(IPortObject port : portsToRemove) {
+				ports.remove(port);
+			}
+			if(stateToUpdate != null) { state = stateToUpdate; }
+			if(typeToUpdate != null) { type = typeToUpdate; }
+			if(dpidToUpdate != null) { dpid = dpidToUpdate; }
+
+			clearUncommitedData();
+		}
+		
+		public void rollback() {
+			clearUncommitedData();
+		}
+		
+		public void clearUncommitedData() {
+			portsToAdd.clear();
+			portsToRemove.clear();
+			stateToUpdate = typeToUpdate = dpidToUpdate = null;
+		}
+		
+		public void setStateForTest(String state) { this.state = state; }
+		public void setTypeForTest(String type) { this.type = type; }
+		public void setDpidForTest(String dpid) { this.dpid = dpid; }
+		public void addPortForTest(TestPortObject port) { ports.add(port);  }
+		public void addDeviceForTest(TestDeviceObject dev) { devices.add(dev); }
+		public void addEntryForTest(TestFlowEntry entry) { entries.add(entry); }
+		
+		@Override
+		public String getState() { return state; }
+	
+		@Override
+		public void setState(String state) { this.stateToUpdate = state; }
+	
+		@Override
+		public String getType() { return type ; }
+	
+		@Override
+		public void setType(String type) { this.typeToUpdate = type; }
+	
+		// Not support for test
+		@Override
+		public Vertex asVertex() { return null; }
+	
+		@Override
+		public String getDPID() { return dpid; }
+	
+		@Override
+		public void setDPID(String dpid) { this.dpidToUpdate = dpid; }
+	
+		@Override
+		public Iterable<IPortObject> getPorts() { return ports; }
+	
+		@Override
+		public IPortObject getPort(@GremlinParam("port_num") short port_num) {
+			for(IPortObject port : ports) {
+				if(port.getNumber() == port_num) {
+					return port;
+				}
+			}
+			return null;
+		}
+	
+		@Override
+		public void addPort(IPortObject port) { portsToAdd.add(port); }
+	
+		@Override
+		public void removePort(IPortObject port) { portsToRemove.add(port); }
+	
+		@Override
+		public Iterable<IDeviceObject> getDevices() { return devices; }
+	
+		@Override
+		public Iterable<IFlowEntry> getFlowEntries() { return entries; }
+	}
+	
+	public static class TestPortObject implements IPortObject {
+		private String state,type,desc;
+		private Short number;
+		private Integer port_state;
+		private ISwitchObject sw;
+		
+		private List<IPortObject> linkedPorts;
+		private List<IDeviceObject> devices;
+		private List<IFlowEntry> inflows,outflows;
+		
+		private String stateToUpdate,typeToUpdate,descToUpdate;
+		private Short numberToUpdate;
+		private Integer port_stateToUpdate;
+		
+		private List<IPortObject> linkedPortsToAdd;
+		private List<IPortObject> linkedPortsToRemove;
+		private List<IDeviceObject> devicesToAdd;
+		private List<IDeviceObject> devicesToRemove;
+		
+
+		public TestPortObject() {
+			type = "port";
+
+			linkedPorts = new ArrayList<IPortObject>();
+			linkedPortsToAdd = new ArrayList<IPortObject>();
+			linkedPortsToRemove = new ArrayList<IPortObject>();
+			devices = new ArrayList<IDeviceObject>();
+			devicesToAdd = new ArrayList<IDeviceObject>();
+			devicesToRemove = new ArrayList<IDeviceObject>();
+			inflows = new ArrayList<IFlowEntry>();
+			outflows = new ArrayList<IFlowEntry>();
+			
+			clearUncommitedData();
+		}
+		
+		public void commit() {
+			for(IPortObject port : linkedPortsToAdd) { linkedPorts.add(port); }
+			for(IPortObject port : linkedPortsToRemove) { linkedPorts.remove(port); }
+			for(IDeviceObject dev : devicesToAdd) { devices.add(dev); }
+			for(IDeviceObject dev : devicesToRemove) { devices.remove(dev); }
+			
+			if(stateToUpdate != null) { state = stateToUpdate; }
+			if(typeToUpdate != null) { type = typeToUpdate; }
+			if(descToUpdate != null) { desc = descToUpdate; }
+			if(numberToUpdate != null) { number = numberToUpdate; }
+			if(port_stateToUpdate != null) { port_state = port_stateToUpdate; }
+			
+			clearUncommitedData();
+		}
+		
+		public void rollback() {
+			clearUncommitedData();
+		}
+		
+		public void clearUncommitedData() {
+			linkedPortsToAdd.clear();
+			linkedPortsToRemove.clear();
+			devicesToAdd.clear();
+			devicesToRemove.clear();
+			stateToUpdate = typeToUpdate = descToUpdate = null;
+			port_stateToUpdate = null;
+			numberToUpdate = null;
+		}
+		
+		// Setter methods for test
+		public void setStateForTest(String state) { this.state = state; }
+		public void setTypeForTest(String type) { this.type = type; }
+		public void setDescForTest(String desc) { this.desc = desc; }
+		public void setNumberForTest(Short number) { this.number = number; }
+		public void setPortStateForTest(Integer state) { this.port_state = state; }
+		public void setSwitchForTest(ISwitchObject sw) { this.sw = sw; }
+		public void addLinkedPortForTest(TestPortObject port) { this.linkedPorts.add(port); }
+		public void addInflowForTest(TestFlowEntry entry) { inflows.add(entry); }
+		public void addOutflowForTest(TestFlowEntry entry) { outflows.add(entry); }
+		
+		// Override methods for mock IPortObject
+		@Override
+		public String getState() { return state; }
+
+		@Override
+		public void setState(String state) { this.stateToUpdate = state; }
+
+		@Override
+		public String getType() { return type; }
+
+		@Override
+		public void setType(String type) { this.typeToUpdate = type; }
+
+		// not support for test
+		@Override
+		public Vertex asVertex() {
+			return null;
+		}
+
+		@Override
+		public Short getNumber() { return number; }
+
+		@Override
+		public void setNumber(Short n) { this.numberToUpdate = n; }
+
+		@Override
+		public String getDesc() { return desc; }
+
+		@Override
+		public void setDesc(String s) { this.descToUpdate = s; }
+
+		@Override
+		public Integer getPortState() { return port_state; }
+
+		@Override
+		public void setPortState(Integer s) { this.port_stateToUpdate = s; }
+
+		@Override
+		public ISwitchObject getSwitch() { return sw; }
+
+		@Override
+		public Iterable<IDeviceObject> getDevices() { return devices; }
+
+		@Override
+		public void setDevice(IDeviceObject device) { devicesToAdd.add(device); }
+
+		@Override
+		public void removeDevice(IDeviceObject device) { devicesToRemove.add(device); }
+
+		@Override
+		public Iterable<IFlowEntry> getInFlowEntries() { return inflows; }
+
+		@Override
+		public Iterable<IFlowEntry> getOutFlowEntries() { return outflows; }
+
+		@Override
+		public Iterable<IPortObject> getLinkedPorts() { return linkedPorts; }
+
+		@Override
+		public void removeLink(IPortObject dest_port) { linkedPortsToRemove.add(dest_port); }
+
+		@Override
+		public void setLinkPort(IPortObject dest_port) { linkedPortsToAdd.add(dest_port); }
+	}
+		
+	public static class TestDeviceObject implements IDeviceObject {
+		private String state,type,mac,ipaddr;
+		private List<IPortObject> ports;
+		private List<ISwitchObject> switches;
+		
+		private String stateToUpdate,typeToUpdate,macToUpdate,ipaddrToUpdate;
+		private List<IPortObject> portsToAdd;
+		private List<IPortObject> portsToRemove;
+	
+		public TestDeviceObject() {
+			type = "device";
+			
+			ports = new ArrayList<IPortObject>();
+			portsToAdd = new ArrayList<IPortObject>();
+			portsToRemove = new ArrayList<IPortObject>();
+			switches = new ArrayList<ISwitchObject>();
+			
+			clearUncommitedData();
+		}
+		
+		public void commit() {
+			for(IPortObject port : portsToAdd) {
+				ports.add(port);
+			}
+			for(IPortObject port : portsToRemove) {
+				ports.remove(port);
+			}
+			
+			if(stateToUpdate != null) { state = stateToUpdate; }
+			if(typeToUpdate != null) { type = typeToUpdate; }
+			if(macToUpdate != null) { mac = macToUpdate; }
+			if(ipaddrToUpdate != null) { ipaddr = ipaddrToUpdate; }
+			
+			clearUncommitedData();
+		}
+		
+		public void rollback() {
+			clearUncommitedData();
+		}
+		
+		public void clearUncommitedData() {
+			ports.clear();
+			portsToAdd.clear();
+			portsToRemove.clear();
+			
+			stateToUpdate = typeToUpdate = macToUpdate = ipaddrToUpdate = null;
+		}
+		
+		// Setter methods for test
+		public void setStateForTest(String state) { this.state = state; }
+		public void setTypeForTest(String type) { this.type = type; }
+		public void setMacForTest(String mac) { this.mac = mac; }
+		public void setIpaddrForTest(String ipaddr) { this.ipaddr = ipaddr; }
+		public void addSwitchForTest(ISwitchObject sw) { switches.add(sw); }
+		public void addPortForTest(IPortObject port) { ports.add(port); }
+		
+		
+		// Override methods
+		@Override
+		public String getState() { return state; }
+	
+		@Override
+		public void setState(String state) { stateToUpdate = state; }
+	
+		@Override
+		public String getType() { return type; }
+	
+		@Override
+		public void setType(String type) { typeToUpdate = type; }
+	
+		@Override
+		public Vertex asVertex() {
+			// TODO Auto-generated method stub
+			return null;
+		}
+	
+		@Override
+		public String getMACAddress() { return mac; }
+	
+		@Override
+		public void setMACAddress(String macaddr) { macToUpdate = macaddr; }
+	
+		@Override
+		public String getIPAddress() { return ipaddr; }
+	
+		@Override
+		public void setIPAddress(String ipaddr) { ipaddrToUpdate = ipaddr; }
+	
+		@Override
+		public Iterable<IPortObject> getAttachedPorts() {
+			return ports; }
+	
+		@Override
+		public void setHostPort(IPortObject port) { portsToAdd.add(port); }
+	
+		@Override
+		public void removeHostPort(IPortObject port) { portsToRemove.add(port); }
+	
+		@Override
+		public Iterable<ISwitchObject> getSwitch() { return switches; }
+	}
+	
+	public static class TestFlowPath implements IFlowPath {
+		private String state,type,flowId,installerId,srcSw,dstSw;
+		private String dataPathSummary,userState;
+		private String matchSrcMac,matchDstMac,matchSrcIpaddr,matchDstIpaddr;
+		private Short srcPort,dstPort,matchEthernetFrameType;
+		
+		private List<IFlowEntry> entries;
+		private List<ISwitchObject> switches;
+
+		private String stateToUpdate,typeToUpdate,flowIdToUpdate,installerIdToUpdate,srcSwToUpdate,dstSwToUpdate;
+		private String dataPathSummaryToUpdate,userStateToUpdate;
+		private String matchSrcMacToUpdate,matchDstMacToUpdate,matchSrcIpaddrToUpdate,matchDstIpaddrToUpdate;
+		private Short srcPortToUpdate,dstPortToUpdate,matchEthernetFrameTypeToUpdate;
+
+		private List<IFlowEntry> flowsToAdd;
+		private List<IFlowEntry> flowsToRemove;
+
+		public TestFlowPath() {
+			type = "flow";
+			
+			entries = new ArrayList<IFlowEntry>();
+			flowsToAdd = new ArrayList<IFlowEntry>();
+			flowsToRemove = new ArrayList<IFlowEntry>();
+			
+			switches = new ArrayList<ISwitchObject>();
+			
+			clear();
+		}
+		
+		public void commit() {
+			for(IFlowEntry flow : flowsToAdd) {
+				entries.add(flow);
+			}
+			for(IFlowEntry flow : flowsToRemove) {
+				entries.remove(flow);
+			}
+			if(stateToUpdate != null) { state = stateToUpdate; }
+			if(typeToUpdate != null) { type = typeToUpdate; }
+			if(flowIdToUpdate != null) { flowId = flowIdToUpdate; }
+			if(installerIdToUpdate != null) { installerId = installerIdToUpdate; }
+			if(srcSwToUpdate != null) { srcSw = srcSwToUpdate; }
+			if(dstSwToUpdate != null) { dstSw = dstSwToUpdate; }
+			if(dataPathSummaryToUpdate != null) { dataPathSummary = dataPathSummaryToUpdate; }
+			if(userStateToUpdate != null) { userState = userStateToUpdate; }
+			if(matchSrcMacToUpdate != null) { matchSrcMac = matchSrcMacToUpdate; }
+			if(matchDstMacToUpdate != null) { matchDstMac = matchDstMacToUpdate; }
+			if(matchSrcIpaddrToUpdate != null) { matchSrcIpaddr = matchSrcIpaddrToUpdate; }
+			if(matchDstIpaddrToUpdate != null) { matchDstIpaddr = matchDstIpaddrToUpdate; }
+			if(srcPortToUpdate != null) { srcPort = srcPortToUpdate; }
+			if(dstPortToUpdate != null) { dstPort = dstPortToUpdate; }
+			if(matchEthernetFrameTypeToUpdate != null) { matchEthernetFrameType = matchEthernetFrameTypeToUpdate; }
+		}
+		
+		public void rollback() {
+			clear();
+		}
+		
+		public void clear() {
+			flowsToAdd.clear();
+			flowsToRemove.clear();
+			
+			stateToUpdate = typeToUpdate = flowIdToUpdate = installerIdToUpdate = null;
+			srcSwToUpdate = dstSwToUpdate = dataPathSummaryToUpdate = userStateToUpdate = null;
+			matchSrcMacToUpdate = matchDstMacToUpdate = matchSrcIpaddrToUpdate = matchDstIpaddrToUpdate = null;
+			srcPortToUpdate = dstPortToUpdate = matchEthernetFrameTypeToUpdate = null;
+		}
+		
+		// Setter methods for test
+		public void setStateForTest(String state) { this.state = state; }
+		public void setTypeForTest(String type) { this.type = type; }
+		public void setFlowIdForTest(String flowId) { this.flowId = flowId; }
+		public void setInstallerIdForTest(String installerId) { this.installerId = installerId; }
+		public void setSrcSwForTest(String srcSw) { this.srcSw = srcSw; }
+		public void setDstSwForTest(String dstSw) { this.dstSw = dstSw; }
+		public void setDataPathSummaryForTest(String dataPathSummary) { this.dataPathSummary = dataPathSummary; }
+		public void setUserStateForTest(String userState) { this.userState = userState; }
+		public void setMatchSrcMacForTest(String matchSrcMac) { this.matchSrcMac = matchSrcMac; }
+		public void setMatchDstMacForTest(String matchDstMac) { this.matchDstMac = matchDstMac; }
+		public void setMatchSrcIpaddrForTest(String matchSrcIpaddr) { this.matchSrcIpaddr = matchSrcIpaddr; }
+		public void setMatchDstIpaddrForTest(String matchDstIpaddr) { this.matchDstIpaddr = matchDstIpaddr; }
+		public void setSrcPortForTest(Short srcPort) { this.srcPort = srcPort; }
+		public void setDstPortForTest(Short dstPort) { this.dstPort = dstPort; }
+		public void setMatchEthernetFrameTypeForTest(Short matchEthernetFrameType) { this.matchEthernetFrameType = matchEthernetFrameType; }
+		public void addFlowEntryForTest(IFlowEntry entry) { entries.add(entry); }
+		public void addSwitchForTest(ISwitchObject sw) { switches.add(sw); }
+
+		@Override
+		public String getState() { return state; }
+
+		@Override
+		public void setState(String state) { stateToUpdate = state; }
+
+		@Override
+		public String getType() { return type; }
+
+		@Override
+		public void setType(String type) { typeToUpdate = type; }
+
+		@Override
+		public Vertex asVertex() {
+			// TODO Auto-generated method stub
+			return null;
+		}
+
+		@Override
+		public String getFlowId() { return flowId; }
+
+		@Override
+		public void setFlowId(String flowId) { flowIdToUpdate = flowId; }
+
+		@Override
+		public String getInstallerId() { return installerId; }
+
+		@Override
+		public void setInstallerId(String installerId) { installerIdToUpdate = installerId; }
+
+		@Override
+		public String getSrcSwitch() { return srcSw; }
+
+		@Override
+		public void setSrcSwitch(String srcSwitch) { srcSwToUpdate = srcSwitch; }
+
+		@Override
+		public Short getSrcPort() { return srcPort; }
+
+		@Override
+		public void setSrcPort(Short srcPort) { srcPortToUpdate = srcPort; }
+
+		@Override
+		public String getDstSwitch() { return dstSw; }
+
+		@Override
+		public void setDstSwitch(String dstSwitch) { dstSwToUpdate = dstSwitch; }
+
+		@Override
+		public Short getDstPort() { return dstPort; }
+
+		@Override
+		public void setDstPort(Short dstPort) { dstPortToUpdate = dstPort; }
+
+		@Override
+		public String getDataPathSummary() { return dataPathSummary; }
+
+		@Override
+		public void setDataPathSummary(String dataPathSummary) { dataPathSummaryToUpdate = dataPathSummary; }
+
+		@Override
+		public Iterable<IFlowEntry> getFlowEntries() { return entries; }
+
+		@Override
+		public void addFlowEntry(IFlowEntry flowEntry) {
+			if(! entries.contains(flowEntry)) {
+				flowsToAdd.add(flowEntry);
+			}
+		}
+
+		@Override
+		public void removeFlowEntry(IFlowEntry flowEntry) {
+			if(entries.contains(flowEntry)) {
+				flowsToAdd.add(flowEntry);
+			}
+		}
+
+		@Override
+		public Short getMatchEthernetFrameType() { return matchEthernetFrameType; }
+
+		@Override
+		public void setMatchEthernetFrameType(Short matchEthernetFrameType) {
+			matchEthernetFrameTypeToUpdate = matchEthernetFrameType; }
+
+		@Override
+		public String getMatchSrcMac() { return matchSrcMac; }
+
+		@Override
+		public void setMatchSrcMac(String matchSrcMac) { matchSrcMacToUpdate = matchSrcMac; }
+
+		@Override
+		public String getMatchDstMac() { return matchDstMac; }
+
+		@Override
+		public void setMatchDstMac(String matchDstMac) { matchDstMacToUpdate = matchDstMac; }
+
+		@Override
+		public String getMatchSrcIPv4Net() { return matchSrcIpaddr; }
+
+		@Override
+		public void setMatchSrcIPv4Net(String matchSrcIPv4Net) {
+			matchSrcIpaddrToUpdate = matchSrcIPv4Net; }
+
+		@Override
+		public String getMatchDstIPv4Net() { return matchDstIpaddr; }
+
+		@Override
+		public void setMatchDstIPv4Net(String matchDstIPv4Net) {
+			matchDstIpaddrToUpdate = matchDstIPv4Net; }
+
+		@Override
+		public Iterable<ISwitchObject> getSwitches() { return switches; }
+
+		@Override
+		public String getUserState() { return userState; }
+
+		@Override
+		public void setUserState(String userState) { userStateToUpdate = userState; }
+	}
+
+	public static class TestFlowEntry implements IFlowEntry {
+		private String state,type,entryId,dpid,userState,switchState,errorStateType,errorStateCode;
+		private String matchSrcMac,matchDstMac,matchSrcIpaddr,matchDstIpaddr;
+		private Short matchInPort,matchEtherFrameType,actionOutput;
+		
+		private IFlowPath flowPath;
+		private ISwitchObject sw;
+		private IPortObject inport,outport;
+	
+		private String stateToUpdate,typeToUpdate,entryIdToUpdate,dpidToUpdate,
+			userStateToUpdate,switchStateToUpdate,errorStateTypeToUpdate,errorStateCodeToUpdate;
+		private String matchSrcMacToUpdate,matchDstMacToUpdate,matchSrcIpaddrToUpdate,matchDstIpaddrToUpdate;
+	
+		private Short matchInPortToUpdate,matchEtherFrameTypeToUpdate,actionOutputToUpdate;
+	
+		private IFlowPath flowPathToUpdate;
+		private ISwitchObject swToUpdate;
+		private IPortObject inportToUpdate,outportToUpdate;
+	
+		public TestFlowEntry() {
+			type = "flow_entry";
+			
+			clearUncommitedData();
+		}
+		
+		public void commit() {
+			if(stateToUpdate != null) { state = stateToUpdate; }
+			if(typeToUpdate != null) { type = typeToUpdate; }
+			if(entryIdToUpdate != null) { entryId = entryIdToUpdate; }
+			if(dpidToUpdate != null) { dpid = dpidToUpdate; }
+			if(userStateToUpdate != null) { userState = userStateToUpdate; }
+			if(switchStateToUpdate != null) { switchState = switchStateToUpdate; }
+			if(errorStateTypeToUpdate != null) { errorStateType = errorStateTypeToUpdate; }
+			if(errorStateCodeToUpdate != null) { errorStateCode = errorStateCodeToUpdate; }
+			if(matchSrcMacToUpdate != null) { matchSrcMac = matchSrcMacToUpdate; }
+			if(matchDstMacToUpdate != null) { matchDstMac = matchDstMacToUpdate; }
+			if(matchSrcIpaddrToUpdate != null) { matchSrcIpaddr = matchSrcIpaddrToUpdate; }
+			if(matchDstIpaddrToUpdate != null) { matchDstIpaddr = matchDstIpaddrToUpdate; }
+			if(matchInPortToUpdate != null) { matchInPort = matchInPortToUpdate; }
+			if(matchEtherFrameTypeToUpdate != null) { matchEtherFrameType = matchEtherFrameTypeToUpdate; }
+			if(actionOutputToUpdate != null) { actionOutput = actionOutputToUpdate; }
+			
+			if(flowPathToUpdate != null) { flowPath = flowPathToUpdate; }
+			if(swToUpdate != null) { sw = swToUpdate; }
+			if(inportToUpdate != null) { inport = inportToUpdate; }
+			if(outportToUpdate != null) { outport = outportToUpdate; }
+	
+			clearUncommitedData();
+		}
+		
+		public void rollback() {
+			clearUncommitedData();
+		}
+		
+		public void clearUncommitedData() {
+			stateToUpdate = typeToUpdate = entryIdToUpdate = dpidToUpdate = null;
+			userStateToUpdate = switchStateToUpdate = errorStateTypeToUpdate = errorStateCodeToUpdate = null;
+			matchSrcMacToUpdate = matchDstMacToUpdate = matchSrcIpaddrToUpdate = matchDstIpaddrToUpdate = null;
+			matchInPortToUpdate = matchEtherFrameTypeToUpdate = actionOutputToUpdate = null;
+			flowPathToUpdate = null;
+			swToUpdate = null;
+			inportToUpdate = outportToUpdate = null;
+		}
+		
+		// Setter methods for test
+		public void setStateForTest(String state) { this.state = state; }
+		public void setTypeForTest(String type) { this.type = type; }
+		public void setEntryIdForTest(String entryId) { this.entryId = entryId; }
+		public void setDpidForTest(String dpid) { this.dpid = dpid; }
+		public void setUserStateForTest(String userState) { this.userState = userState; }
+		public void setSwitchStateForTest(String switchState) { this.switchState = switchState; }
+		public void setErrorStateTypeForTest(String errorStateType) { this.errorStateType = errorStateType; }
+		public void setErrorStateCodeForTest(String errorStateCode) { this.errorStateCode = errorStateCode; }
+		public void setMatchSrcMacForTest(String matchSrcMac) { this.matchSrcMac = matchSrcMac; }
+		public void setMatchDstMacForTest(String matchDstMac) { this.matchDstMac = matchDstMac; }
+		public void setMatchSrcIpaddrForTest(String matchSrcIpaddr) { this.matchSrcIpaddr = matchSrcIpaddr; }
+		public void setMatchDstIpaddrForTest(String matchDstIpaddr) { this.matchDstIpaddr = matchDstIpaddr; }
+		public void setMatchInPortForTest(Short matchInPort) { this.matchInPort = matchInPort; }
+		public void setMatchEtherFrameTypeForTest(Short matchEtherFrameType) { this.matchEtherFrameType = matchEtherFrameType; }
+		public void setActionOutputForTest(Short actionOutput) { this.actionOutput = actionOutput; }
+		public void setFlowPathForTest(IFlowPath flowPath) { this.flowPath = flowPath; }
+		public void setSwitchForTest(ISwitchObject sw) { this.sw = sw; }
+		public void setInportForTest(IPortObject inport) { this.inport = inport; }
+		public void setOutportForTest(IPortObject outport) { this.outport = outport; }
+		
+		@Override
+		public String getState() { return state; }
+	
+		@Override
+		public void setState(String state) { stateToUpdate = state; }
+	
+		@Override
+		public String getType() { return type; }
+	
+		@Override
+		public void setType(String type) { typeToUpdate = type; }
+	
+		@Override
+		public Vertex asVertex() {
+			// TODO Auto-generated method stub
+			return null;
+		}
+	
+		@Override
+		public String getFlowEntryId() { return entryId; }
+	
+		@Override
+		public void setFlowEntryId(String flowEntryId) { entryIdToUpdate = flowEntryId; }
+	
+		@Override
+		public String getSwitchDpid() { return dpid; }
+	
+		@Override
+		public void setSwitchDpid(String switchDpid) { dpidToUpdate = switchDpid; }
+	
+		@Override
+		public String getUserState() { return userState; }
+	
+		@Override
+		public void setUserState(String userState) { userStateToUpdate = userState; }
+	
+		@Override
+		public String getSwitchState() { return switchState; }
+	
+		@Override
+		public void setSwitchState(String switchState) { switchStateToUpdate = switchState; }
+	
+		@Override
+		public String getErrorStateType() { return errorStateType; }
+	
+		@Override
+		public void setErrorStateType(String errorStateType) { errorStateTypeToUpdate = errorStateType; }
+	
+		@Override
+		public String getErrorStateCode() { return errorStateCode; }
+	
+		@Override
+		public void setErrorStateCode(String errorStateCode) { errorStateCodeToUpdate = errorStateCode; }
+	
+		@Override
+		public Short getMatchInPort() { return matchInPort; }
+	
+		@Override
+		public void setMatchInPort(Short matchInPort) { matchInPortToUpdate = matchInPort; }
+	
+		@Override
+		public Short getMatchEthernetFrameType() {return matchEtherFrameType; }
+	
+		@Override
+		public void setMatchEthernetFrameType(Short matchEthernetFrameType) { matchEtherFrameTypeToUpdate = matchEthernetFrameType; }
+		
+		@Override
+		public String getMatchSrcMac() { return matchSrcMac; }
+	
+		@Override
+		public void setMatchSrcMac(String matchSrcMac) { matchSrcMacToUpdate = matchSrcMac; }
+	
+		@Override
+		public String getMatchDstMac() { return matchDstMac; }
+	
+		@Override
+		public void setMatchDstMac(String matchDstMac) { matchDstMacToUpdate = matchDstMac; }
+	
+		@Override
+		public String getMatchSrcIPv4Net() { return matchSrcIpaddr; }
+	
+		@Override
+		public void setMatchSrcIPv4Net(String matchSrcIPv4Net) { matchSrcIpaddrToUpdate = matchSrcIPv4Net; }
+	
+		@Override
+		public String getMatchDstIPv4Net() { return matchDstIpaddr; }
+	
+		@Override
+		public void setMatchDstIPv4Net(String matchDstIPv4Net) { matchDstIpaddrToUpdate = matchDstIPv4Net; }
+	
+		@Override
+		public Short getActionOutput() { return actionOutput; }
+	
+		@Override
+		public void setActionOutput(Short actionOutput) { actionOutputToUpdate = actionOutput; }
+	
+		@Override
+		public IFlowPath getFlow() { return flowPath; }
+	
+		@Override
+		public void setFlow(IFlowPath flow) { flowPathToUpdate = flow; }
+	
+		@Override
+		public ISwitchObject getSwitch() { return sw; }
+	
+		@Override
+		public void setSwitch(ISwitchObject sw) { swToUpdate = sw; }
+	
+		@Override
+		public IPortObject getInPort() { return inport; }
+	
+		@Override
+		public void setInPort(IPortObject port) { inportToUpdate = port; }
+	
+		@Override
+		public IPortObject getOutPort() { return outport; }
+	
+		@Override
+		public void setOutPort(IPortObject port) { outportToUpdate = port; }
+	}
+
+
+	public TestableGraphDBOperation() {
+		super(EasyMock.createNiceMock(GraphDBConnection.class));
+		
+		switches = new ArrayList<TestSwitchObject>();
+		ports = new ArrayList<TestPortObject>();
+		devices = new ArrayList<TestDeviceObject>();
+		paths = new ArrayList<TestFlowPath>();
+		entries = new ArrayList<TestFlowEntry>();
+		
+		switchesToAdd = new ArrayList<TestSwitchObject>();
+		portsToAdd = new ArrayList<TestPortObject>();
+		devicesToAdd = new ArrayList<TestDeviceObject>();
+		pathsToAdd = new ArrayList<TestFlowPath>();
+		entriesToAdd = new ArrayList<TestFlowEntry>();
+
+		switchesToRemove = new ArrayList<TestSwitchObject>();
+		portsToRemove = new ArrayList<TestPortObject>();
+		devicesToRemove = new ArrayList<TestDeviceObject>();
+		pathsToRemove = new ArrayList<TestFlowPath>();
+		entriesToRemove = new ArrayList<TestFlowEntry>();
+		
+		clearUncommitedData();
+	}
+	
+	private void clearUncommitedData() {
+		for(TestFlowEntry flow : entries) {
+			flow.clearUncommitedData();
+		}
+		for(TestFlowEntry flow : entriesToAdd) {
+			flow.clearUncommitedData();
+		}
+		
+		for(TestDeviceObject dev : devices) {
+			dev.clearUncommitedData();
+		}
+		for(TestDeviceObject dev : devicesToAdd) {
+			dev.clearUncommitedData();
+		}
+		
+		for(TestSwitchObject sw : switches) {
+			sw.clearUncommitedData();
+		}
+		for(TestSwitchObject sw : switchesToAdd) {
+			sw.clearUncommitedData();
+		}
+		
+		for(TestPortObject port : ports) {
+			port.clearUncommitedData();
+		}
+		for(TestPortObject port : portsToAdd) {
+			port.clearUncommitedData();
+		}
+		
+		entriesToAdd.clear();
+		entriesToRemove.clear();
+		devicesToAdd.clear();
+		devicesToRemove.clear();
+		switchesToAdd.clear();
+		switchesToRemove.clear();
+		portsToAdd.clear();
+		portsToRemove.clear();
+	}
+	
+	
+	// this.*ForTest() methods below are supposed to be used for creation of test topology.
+	/**
+	 * Create new empty TestSwitchObject.
+	 * @return New TestSwitchObject
+	 */
+	public TestSwitchObject createNewSwitchForTest() {
+		TestSwitchObject sw = new TestSwitchObject();
+		switches.add(sw);
+		return sw;
+	}
+	
+	/**
+	 * Create new TestSwitchObject with specific DPID.
+	 * @param dpid DPID to be set
+	 * @return New TestSwitchObject
+	 */
+	public TestSwitchObject createNewSwitchForTest(String dpid) {
+		for(TestSwitchObject sw_loop : switches) {
+			if(sw_loop.getDPID().equals(dpid)) {
+				// Already created
+				log.error("switch already exists : " + dpid);
+				return sw_loop;
+			}
+		}
+
+		TestSwitchObject sw = new TestSwitchObject();
+		
+		sw.setDpidForTest(dpid);
+		switches.add(sw);
+		
+		return sw;
+	}
+	
+	/**
+	 * Create new empty TestPortObject.
+	 * @return New TestPortObject
+	 */
+	public TestPortObject createNewPortForTest() {
+		TestPortObject port = new TestPortObject();
+		ports.add(port);
+		return port;
+	}
+	
+	/**
+	 * Create new TestPortObject with specific DPID and port number.
+	 * @param dpid DPID to be set
+	 * @param number Port number to be set
+	 * @return New TestPortObject
+	 */
+	public TestPortObject createNewPortForTest(String dpid, Short number) {
+		TestSwitchObject sw = null;
+		
+		for(TestSwitchObject sw_loop : switches) {
+			if(sw_loop.getDPID().equals(dpid)) {
+				sw = sw_loop;
+			}
+		}
+		
+		if(sw != null) {
+			TestPortObject port = new TestPortObject();
+			port.setNumberForTest(number);
+			port.setSwitchForTest(sw);
+			sw.addPortForTest(port);
+			
+			ports.add(port);
+
+			return port;
+		} else {
+			return  null;
+		}
+	}
+	
+	/**
+	 * Link a TestPortObject to other TestPortObject.
+	 * @param src TestPortObjecgt of source port.
+	 * @param dst TestPortObjecgt of destination port.
+	 */
+	public void setLinkBetweenPortsForTest(TestPortObject src, TestPortObject dst) {
+		src.addLinkedPortForTest(dst);
+	}
+	
+	/**
+	 * Create new empty TestDeviceObject.
+	 * @return New TestDeviceObject
+	 */
+	public TestDeviceObject createNewDeviceForTest() {
+		TestDeviceObject dev = new TestDeviceObject();
+		
+		return dev;
+	}
+	
+	/**
+	 * Create new empty TestFlowPathObject.
+	 * @return New TestFlowPathObject
+	 */
+	public TestFlowPath createNewFlowPathForTest() {
+		TestFlowPath path = new TestFlowPath();
+		paths.add(path);
+		return path;
+	}
+
+	/**
+	 * Create new empty TestFlowEntryObject.
+	 * @return New TestFlowEntryObject
+	 */
+	public TestFlowEntry createNewFlowEntryForTest() {
+		TestFlowEntry entry = new TestFlowEntry();
+		entries.add(entry);
+		return entry;
+	}
+
+	
+	public boolean hasLinkBetween(String srcSw_str, Short srcNumber, String dstSw_str, Short dstNumber) {
+		IPortObject srcPort = null, dstPort = null;
+		long srcSw = HexString.toLong(srcSw_str);
+		long dstSw = HexString.toLong(dstSw_str);
+		
+		for(TestSwitchObject sw : switches) {
+			long swLong = HexString.toLong(sw.getDPID());
+			if(swLong == srcSw) {
+				for(IPortObject port : sw.getPorts()) {
+					if(port.getNumber().equals(srcNumber)) {
+						srcPort = port;
+					}
+				}
+			} else if(swLong == dstSw) {
+				for(IPortObject port : sw.getPorts()) {
+					if(port.getNumber().equals(dstNumber)) {
+						dstPort = port;
+					}
+				}
+			}
+		}
+		
+		if(srcPort != null && dstPort != null) {
+			for(IPortObject port : srcPort.getLinkedPorts()) {
+				if(port.equals(dstPort)) {
+					return true;
+				}
+			}
+		}
+		
+		return false;
+	}
+
+	// Overriding methods below are to mock GraphDBOperation class.
+	@Override
+	public ISwitchObject newSwitch(String dpid) {
+		TestSwitchObject sw = new TestSwitchObject();
+		sw.setDPID(dpid);
+		switchesToAdd.add(sw);
+		
+		return sw;
+	}
+
+	@Override
+	public ISwitchObject searchSwitch(String dpid_str) {
+		Long dpid = HexString.toLong(dpid_str);
+		
+		for(ISwitchObject sw : switches) {
+			if(HexString.toLong(sw.getDPID()) == dpid) {
+				return sw;
+			}
+		}
+		return null;
+	}
+
+	@Override
+	public ISwitchObject searchActiveSwitch(String dpid_str) {
+		Long dpid = HexString.toLong(dpid_str);
+
+		for(ISwitchObject sw : switches) {
+			if(HexString.toLong(sw.getDPID()) == dpid && sw.getState().equals("ACTIVE")) {
+				return sw;
+			}
+		}
+		return null;
+	}
+
+	@Override
+	public Iterable<ISwitchObject> getActiveSwitches() {
+		List<ISwitchObject> list = new ArrayList<ISwitchObject>();
+		
+		for(ISwitchObject sw : switches) {
+			if(sw.getState() != null && sw.getState().equals("ACTIVE")) {
+				list.add(sw);
+			}
+		}
+		return list.isEmpty() ? null : list;
+	}
+
+	@Override
+	public Iterable<ISwitchObject> getAllSwitches() {
+		List<ISwitchObject> list = new ArrayList<ISwitchObject>();
+		
+		for(ISwitchObject sw : switches) {
+			list.add(sw);
+		}
+		
+		return list.isEmpty() ? null : list;
+	}
+
+	@Override
+	public Iterable<ISwitchObject> getInactiveSwitches() {
+		List<ISwitchObject> list = new ArrayList<ISwitchObject>();
+		
+		for(ISwitchObject sw : switches) {
+			if(! sw.getState().equals("ACTIVE")) {
+				list.add(sw);
+			}
+		}
+		return list.isEmpty() ? null : list;
+	}
+
+	@Override
+	public Iterable<IFlowEntry> getAllSwitchNotUpdatedFlowEntries() {
+		List<IFlowEntry> list = new ArrayList<IFlowEntry>();
+		
+		for(TestFlowEntry entry : entries) {
+			if(entry.getSwitchState().equals("FE_SWITCH_NOT_UPDATED")) {
+				list.add(entry);
+			}
+		}
+		return list;
+	}
+
+	@Override
+	public void removeSwitch(ISwitchObject sw) {
+		if(switches.contains(sw)) {
+			switchesToRemove.add((TestSwitchObject)sw);
+		}
+	}
+
+	@Override
+	public IPortObject newPort(Short portNumber) {
+		TestPortObject port = new TestPortObject();
+		port.setNumber(portNumber);
+		
+		return port;
+	}
+
+	public IPortObject newPort(Long dpid, Short portNumber) {
+		TestPortObject port = null;
+		TestSwitchObject sw = (TestSwitchObject)searchSwitch(HexString.toHexString(dpid));
+		
+		if(sw != null) {
+			port = (TestPortObject)newPort(portNumber);
+			portsToAdd.add(port);
+			sw.addPort(port);
+		}
+		
+		return port;
+	}
+	
+	@Override
+	public IPortObject searchPort(String dpid_str, short number) {
+		long dpid = HexString.toLong(dpid_str);
+		
+		for(TestSwitchObject sw : switches) {
+			if(HexString.toLong(sw.getDPID()) == dpid) {
+				for(IPortObject port : sw.getPorts()) {
+					if(port.getNumber().equals(number)) {
+						return port;
+					}
+				}
+			}
+		}
+		return null;
+	}
+
+	@Override
+	public void removePort(IPortObject port) {
+		for(TestSwitchObject sw : switches) {
+			for(IPortObject pt : sw.getPorts()) {
+				if(pt.equals(port)) {
+					sw.removePort(port);
+				}
+			}
+		}
+		portsToRemove.add((TestPortObject)port);
+	}
+
+	@Override
+	public IDeviceObject newDevice() {
+		TestDeviceObject dev = new TestDeviceObject();
+		devicesToAdd.add(dev);
+		
+		return dev;
+	}
+
+	@Override
+	public IDeviceObject searchDevice(String macAddr) {
+		for(IDeviceObject dev : devices) {
+			if(dev.getMACAddress().equals(macAddr)) {
+				return dev;
+			}
+		}
+		return null;
+	}
+
+	@Override
+	public Iterable<IDeviceObject> getDevices() {
+		List<IDeviceObject> list = new ArrayList<IDeviceObject>();
+		
+		for(TestDeviceObject dev : devices) {
+			list.add(dev);
+		}
+		
+		return list;
+	}
+
+	@Override
+	public void removeDevice(IDeviceObject dev) {
+		if(devices.contains((TestDeviceObject)dev)) {
+			devicesToRemove.add((TestDeviceObject)dev);
+		}
+	}
+
+	@Override
+	public IFlowPath newFlowPath() {
+		TestFlowPath path = new TestFlowPath();
+		pathsToAdd.add(path);
+		
+		return path;
+	}
+
+	@Override
+	public IFlowPath searchFlowPath(FlowId flowId) {
+		for(IFlowPath path : paths) {
+			if(path.getFlowId().equals(flowId)) {
+				return path;
+			}
+		}
+		return null;
+	}
+
+	@Override
+	public IFlowPath getFlowPathByFlowEntry(IFlowEntry flowEntry) {
+		for(IFlowPath path : paths) {
+			for(IFlowEntry entry : path.getFlowEntries()) {
+				if(entry.equals(flowEntry)) {
+					return path;
+				}
+			}
+
+		}
+		return null;
+	}
+
+	@Override
+	public Iterable<IFlowPath> getAllFlowPaths() {
+		List<IFlowPath> list = new ArrayList<IFlowPath>();
+		
+		for(IFlowPath path : paths) {
+			list.add(path);
+		}
+		
+		return list;
+	}
+
+	@Override
+	public void removeFlowPath(IFlowPath flowPath) {
+		if(paths.contains((TestFlowPath)flowPath)) {
+			pathsToRemove.add((TestFlowPath)flowPath);
+		}
+	}
+
+	@Override
+	public IFlowEntry newFlowEntry() {
+		TestFlowEntry entry = new TestFlowEntry();
+		entriesToAdd.add(entry);
+		return entry;
+	}
+
+	@Override
+	public IFlowEntry searchFlowEntry(FlowEntryId flowEntryId) {
+		for(TestFlowEntry entry : entries) {
+			// TODO check if this matching works
+			if(entry.getFlowEntryId().equals(flowEntryId)) {
+				return entry;
+			}
+		}
+		return null;
+	}
+
+	@Override
+	public Iterable<IFlowEntry> getAllFlowEntries() {
+		List<IFlowEntry> list = new ArrayList<IFlowEntry>();
+		
+		for(TestFlowEntry entry : entries) {
+			list.add(entry);
+		}
+		
+		return list;
+	}
+
+	@Override
+	public void removeFlowEntry(IFlowEntry flowEntry) {
+		if(entries.contains((TestFlowEntry)flowEntry)) {
+			entriesToRemove.add((TestFlowEntry)flowEntry);
+		}
+	}
+
+	@Override
+	public IDBConnection getDBConnection() {
+		return super.getDBConnection();
+	}
+
+	@Override
+	public void commit() {
+		for(TestSwitchObject sw : switchesToAdd) {
+			switches.add(sw);
+		}
+		for(TestSwitchObject sw : switchesToRemove) {
+			sw.commit();
+			switches.remove(sw);
+		}
+		for(TestSwitchObject sw : switches) {
+			sw.commit();
+		}
+		
+		for(TestPortObject port : portsToAdd) {
+			ports.add(port);
+		}
+		for(TestPortObject port : portsToRemove) {
+			port.commit();
+			ports.remove(port);
+		}
+		for(TestPortObject port : ports) {
+			port.commit();
+		}
+		
+		for(TestDeviceObject dev : devicesToAdd) {
+			devices.add(dev);
+		}
+		for(TestDeviceObject dev : devicesToRemove) {
+			dev.commit();
+			devices.remove(dev);
+		}
+		for(TestDeviceObject dev : devices) {
+			dev.commit();
+		}
+		
+		clearUncommitedData();
+	}
+
+	@Override
+	public void rollback() {
+		clearUncommitedData();
+	}
+
+	@Override
+	public void close() {
+		// TODO Auto-generated method stub
+
+	}
+}
diff --git a/src/test/java/net/floodlightcontroller/linkdiscovery/internal/TestableLinkStorageImpl.java b/src/test/java/net/onrc/onos/ofcontroller/core/internal/TestableLinkStorageImpl.java
similarity index 89%
rename from src/test/java/net/floodlightcontroller/linkdiscovery/internal/TestableLinkStorageImpl.java
rename to src/test/java/net/onrc/onos/ofcontroller/core/internal/TestableLinkStorageImpl.java
index 5709f03..2f90d48 100644
--- a/src/test/java/net/floodlightcontroller/linkdiscovery/internal/TestableLinkStorageImpl.java
+++ b/src/test/java/net/onrc/onos/ofcontroller/core/internal/TestableLinkStorageImpl.java
@@ -1,7 +1,9 @@
-package net.floodlightcontroller.linkdiscovery.internal;
+package net.onrc.onos.ofcontroller.core.internal;
 
 import java.util.Set;
 
+import net.onrc.onos.ofcontroller.core.internal.LinkStorageImpl;
+
 import com.thinkaurelius.titan.core.TitanGraph;
 import com.tinkerpop.blueprints.TransactionalGraph.Conclusion;
 import com.tinkerpop.blueprints.Vertex;
diff --git a/src/test/java/net/floodlightcontroller/core/internal/TestableSwitchStorageImpl.java b/src/test/java/net/onrc/onos/ofcontroller/core/internal/TestableSwitchStorageImpl.java
similarity index 93%
rename from src/test/java/net/floodlightcontroller/core/internal/TestableSwitchStorageImpl.java
rename to src/test/java/net/onrc/onos/ofcontroller/core/internal/TestableSwitchStorageImpl.java
index a73b90f..e78a1b6 100644
--- a/src/test/java/net/floodlightcontroller/core/internal/TestableSwitchStorageImpl.java
+++ b/src/test/java/net/onrc/onos/ofcontroller/core/internal/TestableSwitchStorageImpl.java
@@ -1,4 +1,4 @@
-package net.floodlightcontroller.core.internal;
+package net.onrc.onos.ofcontroller.core.internal;
 
 import java.util.Set;
 
diff --git a/src/test/java/net/onrc/onos/ofcontroller/devicemanager/internal/DeviceStorageImplTest.java b/src/test/java/net/onrc/onos/ofcontroller/devicemanager/internal/DeviceStorageImplTest.java
index 5309667..5cdcbb5 100644
--- a/src/test/java/net/onrc/onos/ofcontroller/devicemanager/internal/DeviceStorageImplTest.java
+++ b/src/test/java/net/onrc/onos/ofcontroller/devicemanager/internal/DeviceStorageImplTest.java
@@ -1,24 +1,30 @@
 package net.onrc.onos.ofcontroller.devicemanager.internal;
 
-import static org.junit.Assert.*;
-import static org.easymock.EasyMock.*;
+import static org.easymock.EasyMock.createMock;
+import static org.easymock.EasyMock.expect;
+import static org.easymock.EasyMock.replay;
+import static org.easymock.EasyMock.verify;
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertNull;
+import static org.junit.Assert.fail;
 
 import java.util.ArrayList;
 import java.util.List;
 
-import net.onrc.onos.ofcontroller.core.INetMapTopologyObjects.IDeviceObject;
-import net.onrc.onos.ofcontroller.core.INetMapTopologyObjects.IPortObject;
-import net.onrc.onos.ofcontroller.core.internal.SwitchStorageImpl;
-import net.onrc.onos.ofcontroller.devicemanager.internal.DeviceStorageImpl;
-import net.onrc.onos.util.GraphDBConnection;
-import net.onrc.onos.util.GraphDBOperation;
 import net.floodlightcontroller.devicemanager.IDevice;
 import net.floodlightcontroller.devicemanager.SwitchPort;
-import net.floodlightcontroller.devicemanager.internal.Device;
 import net.floodlightcontroller.packet.IPv4;
+import net.onrc.onos.ofcontroller.core.INetMapTopologyObjects.IDeviceObject;
+import net.onrc.onos.ofcontroller.core.INetMapTopologyObjects.IPortObject;
+import net.onrc.onos.ofcontroller.core.internal.DeviceStorageImpl;
+import net.onrc.onos.ofcontroller.core.internal.SwitchStorageImpl;
+import net.onrc.onos.util.GraphDBConnection;
+import net.onrc.onos.util.GraphDBOperation;
+import net.floodlightcontroller.devicemanager.internal.Device;
 import org.easymock.EasyMock;
 import org.junit.After;
 import org.junit.Before;
+import org.junit.Ignore;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.openflow.util.HexString;
@@ -43,7 +49,9 @@
     
 	@Before
 	public void setUp() throws Exception {
-		
+	    deviceImpl = new DeviceStorageImpl();	
+		conf = "/dummy/path/to/db";
+				
 		PowerMock.mockStatic(GraphDBConnection.class);
 		mockConn = createMock(GraphDBConnection.class);
 		PowerMock.suppress(PowerMock.constructor(GraphDBConnection.class));
@@ -52,19 +60,22 @@
 			
 		//PowerMock.mockStatic(GraphDBOperation.class);
 		mockOpe = PowerMock.createMock(GraphDBOperation.class);
-		PowerMock.expectNew(GraphDBOperation.class, mockConn).andReturn(mockOpe);
+		PowerMock.expectNew(GraphDBOperation.class, new Class<?>[]{String.class}, conf).andReturn(mockOpe);
+		mockOpe.close();
 		PowerMock.replay(GraphDBOperation.class);
         // Replace the conf to dummy conf
 		// String conf = "/tmp/cassandra.titan";
-		conf = "/dummy/path/to/db";
+
 		
-        deviceImpl = new DeviceStorageImpl();
+
 	}
 
 	@After
 	public void tearDown() throws Exception {	
 		deviceImpl.close();
 		deviceImpl = null;
+		
+		verify(mockOpe);
 	}
 	
 	private String makeIPStringFromArray(Integer[] ipaddresses){
@@ -142,7 +153,6 @@
 			expect(mockOpe.newDevice()).andReturn(mockIDev);
 			expect(mockOpe.searchPort(switchMacAddr, portNum)).andReturn(mockIPort);
 			mockOpe.commit();
-
 			replay(mockOpe);				
 			
 			deviceImpl.init(conf);
@@ -152,7 +162,6 @@
 			assertNotNull(obj);
 			
 			verify(mockIDev);
-			verify(mockOpe);
 			
 		} catch(Exception e) {
 			fail(e.getMessage());
@@ -233,10 +242,7 @@
 			//Add the same device
 	        IDeviceObject obj2 = deviceImpl.addDevice(mockDev);
 			assertNotNull(obj2);
-			
-			verify(mockIDev);
-			verify(mockOpe);
-			
+
 		} catch(Exception e) {
 			fail(e.getMessage());
 		}
@@ -329,7 +335,6 @@
 			assertNotNull(obj2);
 			
 			verify(mockIDev);
-			verify(mockOpe);
 			
 		} catch(Exception e) {
 			fail(e.getMessage());
@@ -423,7 +428,7 @@
 		    assertNull(dev2);
 		    
 			verify(mockIDev);
-			verify(mockOpe);
+
 		} catch(Exception e) {
 			fail(e.getMessage());
 		}
@@ -505,7 +510,7 @@
 		    assertNotNull(dev);
 		    
 			verify(mockIDev);
-			verify(mockOpe);   
+
 		} catch(Exception e) {
 			fail(e.getMessage());
 		}
@@ -594,7 +599,7 @@
 		    assertNotNull(dev);
 		    
 			verify(mockIDev);
-			verify(mockOpe);
+
 			
 		} catch(Exception e) {
 			fail(e.getMessage());
@@ -729,18 +734,17 @@
 		    deviceImpl.changeDeviceAttachments(mockDev3);
 		    
 			verify(mockIDev);
-			verify(mockOpe);
+
 			
 		} catch(Exception e) {
 			fail(e.getMessage());
 		}
 	}
 
-	//@Ignore
+	@Ignore
 	@Test
 	public void testChangeDeviceAttachmentsIDeviceIDeviceObject() {
 		//It is tested by the testChangeDeviceAttachmentsIDevice
-		deviceImpl.init(conf);
 	}
 
 	/**
@@ -822,7 +826,7 @@
 	        deviceImpl.changeDeviceIPv4Address(mockDev2);	
 	        
 			verify(mockIDev);
-			verify(mockOpe);
+
 					
 		} 
 		catch(Exception e) {
diff --git a/src/test/java/net/onrc/onos/ofcontroller/devicemanager/internal/DeviceStorageImplTestBB.java b/src/test/java/net/onrc/onos/ofcontroller/devicemanager/internal/DeviceStorageImplTestBB.java
index 8ec42be..cea70f0 100644
--- a/src/test/java/net/onrc/onos/ofcontroller/devicemanager/internal/DeviceStorageImplTestBB.java
+++ b/src/test/java/net/onrc/onos/ofcontroller/devicemanager/internal/DeviceStorageImplTestBB.java
@@ -10,11 +10,12 @@
 import net.floodlightcontroller.devicemanager.SwitchPort;
 import net.floodlightcontroller.devicemanager.internal.Device;
 import net.floodlightcontroller.packet.IPv4;
+import net.onrc.onos.ofcontroller.core.IDeviceStorage;
 import net.onrc.onos.ofcontroller.core.INetMapTopologyObjects.IDeviceObject;
 import net.onrc.onos.ofcontroller.core.INetMapTopologyObjects.IPortObject;
 import net.onrc.onos.ofcontroller.core.INetMapTopologyObjects.ISwitchObject;
+import net.onrc.onos.ofcontroller.core.internal.DeviceStorageImpl;
 import net.onrc.onos.ofcontroller.core.internal.SwitchStorageImpl;
-import net.onrc.onos.ofcontroller.devicemanager.IDeviceStorage;
 import net.onrc.onos.util.GraphDBConnection;
 import net.onrc.onos.util.GraphDBOperation;
 
diff --git a/src/test/java/net/floodlightcontroller/linkdiscovery/internal/LinkDiscoveryManagerTest.java b/src/test/java/net/onrc/onos/ofcontroller/linkdiscovery/internal/LinkDiscoveryManagerTest.java
similarity index 97%
rename from src/test/java/net/floodlightcontroller/linkdiscovery/internal/LinkDiscoveryManagerTest.java
rename to src/test/java/net/onrc/onos/ofcontroller/linkdiscovery/internal/LinkDiscoveryManagerTest.java
index 6e99acd..87b48b2 100644
--- a/src/test/java/net/floodlightcontroller/linkdiscovery/internal/LinkDiscoveryManagerTest.java
+++ b/src/test/java/net/onrc/onos/ofcontroller/linkdiscovery/internal/LinkDiscoveryManagerTest.java
@@ -15,7 +15,7 @@
 *    under the License.
 **/
 
-package net.floodlightcontroller.linkdiscovery.internal;
+package net.onrc.onos.ofcontroller.linkdiscovery.internal;
 
 import static org.easymock.EasyMock.*;
 
@@ -35,10 +35,6 @@
 import net.floodlightcontroller.core.IOFSwitch;
 import net.floodlightcontroller.core.module.FloodlightModuleContext;
 import net.floodlightcontroller.core.test.MockThreadPoolService;
-import net.floodlightcontroller.linkdiscovery.ILinkDiscoveryListener;
-import net.floodlightcontroller.linkdiscovery.ILinkDiscoveryService;
-import net.floodlightcontroller.linkdiscovery.LinkInfo;
-import net.floodlightcontroller.linkdiscovery.internal.LinkDiscoveryManager;
 import net.floodlightcontroller.restserver.IRestApiService;
 import net.floodlightcontroller.restserver.RestApiServer;
 import net.floodlightcontroller.routing.IRoutingService;
@@ -50,6 +46,10 @@
 import net.floodlightcontroller.topology.ITopologyService;
 import net.floodlightcontroller.topology.NodePortTuple;
 import net.floodlightcontroller.topology.TopologyManager;
+import net.onrc.onos.ofcontroller.linkdiscovery.ILinkDiscoveryListener;
+import net.onrc.onos.ofcontroller.linkdiscovery.ILinkDiscoveryService;
+import net.onrc.onos.ofcontroller.linkdiscovery.LinkInfo;
+import net.onrc.onos.ofcontroller.linkdiscovery.internal.LinkDiscoveryManager;
 
 /**
  *
diff --git a/src/test/java/net/onrc/onos/util/GraphDBOperationTest.java b/src/test/java/net/onrc/onos/util/GraphDBOperationTest.java
index d1e1c39..223ac67 100644
--- a/src/test/java/net/onrc/onos/util/GraphDBOperationTest.java
+++ b/src/test/java/net/onrc/onos/util/GraphDBOperationTest.java
@@ -5,11 +5,19 @@
 
 import static org.junit.Assert.*;
 
-import java.util.Iterator;
+import java.util.*;
 
+import junit.framework.TestCase;
+
+import net.onrc.onos.ofcontroller.core.INetMapTopologyObjects.IDeviceObject;
+import net.onrc.onos.ofcontroller.core.INetMapTopologyObjects.IFlowEntry;
+import net.onrc.onos.ofcontroller.core.INetMapTopologyObjects.IFlowPath;
+import net.onrc.onos.ofcontroller.core.INetMapTopologyObjects.IPortObject;
 import net.onrc.onos.ofcontroller.core.INetMapTopologyObjects.ISwitchObject;
 import net.onrc.onos.ofcontroller.core.ISwitchStorage.SwitchState;
-import net.floodlightcontroller.core.internal.TestDatabaseManager;
+import net.onrc.onos.ofcontroller.core.internal.TestDatabaseManager;
+import net.onrc.onos.ofcontroller.util.FlowEntryId;
+import net.onrc.onos.ofcontroller.util.FlowId;
 
 import org.easymock.EasyMock;
 import org.junit.After;
@@ -30,11 +38,11 @@
  * @author Toshio Koide
  *
  */
+
 @RunWith(PowerMockRunner.class)
 @PrepareForTest({TitanFactory.class})
-public class GraphDBOperationTest {
+public class GraphDBOperationTest extends TestCase {
 	private static TitanGraph testdb;
-	private static GraphDBConnection conn;
 	private static GraphDBOperation op;
 
 	/**
@@ -59,14 +67,14 @@
 		TestDatabaseManager.deleteTestDatabase();
 		testdb = TestDatabaseManager.getTestDatabase();
 //		TestDatabaseManager.populateTestData(titanGraph);
-		
+
+		String dummyPath = "/dummy/to/conf";
 		// replace return value of TitanFactory.open() to dummy DB created above
 		PowerMock.mockStatic(TitanFactory.class);
-		EasyMock.expect(TitanFactory.open((String)EasyMock.anyObject())).andReturn(testdb);
+		EasyMock.expect(TitanFactory.open(dummyPath)).andReturn(testdb);
 		PowerMock.replay(TitanFactory.class);
 		
-		conn = GraphDBConnection.getInstance("/dummy/to/conf");
-		op = new GraphDBOperation(conn);
+		op = new GraphDBOperation(dummyPath);
 	}
 
 	/**
@@ -74,30 +82,24 @@
 	 */
 	@After
 	public void tearDown() throws Exception {
-		conn.close();
+		op.close();
 		testdb.shutdown();
+		PowerMock.verifyAll();
 	}
 
-	private Iterator<Vertex> enumerateVertices(String vertexType) {
-		return testdb.getVertices("type", vertexType).iterator();
-	}
-	
 	/**
 	 * Test method for {@link net.onrc.onos.util.GraphDBOperation#newSwitch(net.onrc.onos.util.GraphDBConnection)}.
 	 */
 	@Test
 	public final void testNewSwitch() {
-		Iterator<Vertex> vertices;
-		assertFalse(enumerateVertices("switch").hasNext());
+		assertNull(op.searchSwitch("123"));
 
-		ISwitchObject sw = op.newSwitch("123");
-		
-		assertEquals("123", sw.getDPID());
+		op.newSwitch("123");		
 		op.commit();
 
-		vertices = enumerateVertices("switch");
-		assertTrue(vertices.hasNext());
-		assertEquals(vertices.next().getProperty("dpid").toString(), "123");		
+		ISwitchObject sw = op.searchSwitch("123");
+		assertNotNull(op);
+		assertEquals("123", sw.getDPID());
 	}
 
 	/**
@@ -105,13 +107,16 @@
 	 */
 	@Test
 	public final void testSearchSwitch() {
-		ISwitchObject sw = op.newSwitch("123");
+		op.newSwitch("123");
+		op.newSwitch("456");
 		op.commit();
-		
-		sw = op.searchSwitch("123");
-		
+
+		ISwitchObject sw = op.searchSwitch("123");
 		assertNotNull(sw);
 		assertEquals("123", sw.getDPID());
+
+		sw = op.searchSwitch("789");
+		assertNull(sw);
 	}
 
 	/**
@@ -119,13 +124,11 @@
 	 */
 	@Test
 	public final void testSearchActiveSwitch() {
-		ISwitchObject sw = op.newSwitch("111");
-		sw.setState(SwitchState.ACTIVE.toString());
-		sw = op.newSwitch("222");
-		sw.setState(SwitchState.INACTIVE.toString());
+		op.newSwitch("111").setState(SwitchState.ACTIVE.toString());
+		op.newSwitch("222").setState(SwitchState.INACTIVE.toString());
 		op.commit();
 		
-		sw = op.searchActiveSwitch("111");
+		ISwitchObject sw = op.searchActiveSwitch("111");
 		assertNotNull(sw);
 		assertEquals("111", sw.getDPID());
 		
@@ -138,16 +141,71 @@
 	 */
 	@Test
 	public final void testGetActiveSwitches() {
-		ISwitchObject sw = op.newSwitch("111");
-		sw.setState(SwitchState.ACTIVE.toString());
-		sw = op.newSwitch("222");
-		sw.setState(SwitchState.INACTIVE.toString());
+		op.newSwitch("111").setState(SwitchState.ACTIVE.toString());
+		op.newSwitch("222").setState(SwitchState.INACTIVE.toString());
 		op.commit();
 		
 		Iterator<ISwitchObject> i = op.getActiveSwitches().iterator();
+		
 		assertTrue(i.hasNext());
 		assertEquals("111", i.next().getDPID());
-		assertFalse(i.hasNext());		
+		assertFalse(i.hasNext());
+	}
+
+	/**
+	 * Test method for {@link net.onrc.onos.util.GraphDBOperation#getAllSwitches(net.onrc.onos.util.GraphDBConnection)}.
+	 */
+	@Test
+	public final void testGetAllSwitches() {
+		List<String> dpids = Arrays.asList("111", "222", "333");
+		Collections.sort(dpids);
+		
+		for (String dpid: dpids) op.newSwitch(dpid);
+		op.commit();
+
+		List<String> actual_ids = new ArrayList<String>();
+		for (ISwitchObject switchObj: op.getAllSwitches()) actual_ids.add(switchObj.getDPID());
+		Collections.sort(actual_ids);
+
+		assertArrayEquals(dpids.toArray(), actual_ids.toArray());
+	}
+
+	/**
+	 * Test method for {@link net.onrc.onos.util.GraphDBOperation#getInactiveSwitches(net.onrc.onos.util.GraphDBConnection)}.
+	 */
+	@Test
+	public final void testGetInactiveSwitches() {
+		op.newSwitch("111").setState(SwitchState.ACTIVE.toString());
+		op.newSwitch("222").setState(SwitchState.INACTIVE.toString());
+		op.commit();
+		
+		Iterator<ISwitchObject> i = op.getInactiveSwitches().iterator();
+		
+		assertTrue(i.hasNext());
+		assertEquals("222", i.next().getDPID());
+		assertFalse(i.hasNext());
+	}
+
+	/**
+	 * Test method for {@link net.onrc.onos.util.GraphDBOperation#getAllSwitchNotUpdatedFlowEntries(net.onrc.onos.util.GraphDBConnection)}.
+	 */
+	@Test
+	public final void testGetAllSwitchNotUpdatedFlowEntries() {
+		FlowEntryId flowEntryId10 = new FlowEntryId(10);
+		FlowEntryId flowEntryId20 = new FlowEntryId(20);
+		IFlowEntry flowEntry10 = op.newFlowEntry();
+		IFlowEntry flowEntry20 = op.newFlowEntry();
+		flowEntry10.setFlowEntryId(flowEntryId10.toString());
+		flowEntry20.setFlowEntryId(flowEntryId20.toString());
+		flowEntry10.setSwitchState("FE_SWITCH_NOT_UPDATED");
+		flowEntry20.setSwitchState("FE_SWITCH_UPDATED");
+ 		op.commit();
+		
+		Iterator<IFlowEntry> flowEntries = op.getAllSwitchNotUpdatedFlowEntries().iterator();
+		assertNotNull(flowEntries);
+		assertTrue(flowEntries.hasNext());
+		assertEquals(flowEntryId10.toString(), flowEntries.next().getFlowEntryId());
+		assertFalse(flowEntries.hasNext());
 	}
 
 	/**
@@ -158,26 +216,12 @@
 		ISwitchObject sw = op.newSwitch("123");
 		op.commit();	
 		sw = op.searchSwitch("123");
-		
+		assertNotNull(sw);
+
 		op.removeSwitch(sw);
-
-		assertFalse(enumerateVertices("switch").hasNext());
-	}
-
-	/**
-	 * Test method for {@link net.onrc.onos.util.GraphDBOperation#searchDevice(net.onrc.onos.util.GraphDBConnection, java.lang.String)}.
-	 */
-	@Test
-	public final void testSearchDevice() {
-		fail("Not yet implemented");
-	}
-
-	/**
-	 * Test method for {@link net.onrc.onos.util.GraphDBOperation#searchPort(net.onrc.onos.util.GraphDBConnection, java.lang.String, short)}.
-	 */
-	@Test
-	public final void testSearchPort() {
-		fail("Not yet implemented");
+		op.commit();
+		
+		assertNull(op.searchSwitch("123"));
 	}
 
 	/**
@@ -185,15 +229,65 @@
 	 */
 	@Test
 	public final void testNewPort() {
-		fail("Not yet implemented");
+		assertFalse(testdb.getVertices("type", "port").iterator().hasNext());
+		
+		IPortObject port = op.newPort((short) 10);
+		assertTrue(port.getNumber() == 10);
+		op.commit();
+		
+		Iterator<Vertex> vertices = testdb.getVertices("type", "port").iterator();
+		assertTrue(vertices.hasNext());
+		assertEquals(vertices.next().getProperty("number").toString(), "10");		
 	}
 
 	/**
-	 * Test method for {@link net.onrc.onos.util.GraphDBOperation#newDevice(net.onrc.onos.util.GraphDBConnection)}.
+	 * Test method for {@link net.onrc.onos.util.GraphDBOperation#searchPort(net.onrc.onos.util.GraphDBConnection, java.lang.String, short)}.
 	 */
 	@Test
-	public final void testNewDevice() {
-		fail("Not yet implemented");
+	public final void testSearchPort() {
+		ISwitchObject sw;
+		IPortObject port;
+		
+		sw = op.newSwitch("1");
+		sw.addPort(op.newPort((short) 1));
+		sw.addPort(op.newPort((short) 2));
+		
+		sw = op.newSwitch("2");
+		sw.addPort(op.newPort((short) 1));
+		sw.addPort(op.newPort((short) 2));
+
+		op.commit();
+
+		assertNull(op.searchPort("3", (short) 1));
+		assertNull(op.searchPort("1", (short) 3));
+
+		port = op.searchPort("1", (short) 1);
+		assertNotNull(port);
+		assertTrue(port.getNumber() == 1);
+		sw = port.getSwitch();
+		assertNotNull(sw);
+		assertEquals("1", sw.getDPID());
+
+		port = op.searchPort("1", (short) 2);
+		assertNotNull(port);
+		assertTrue(port.getNumber() == 2);
+		sw = port.getSwitch();
+		assertNotNull(sw);
+		assertEquals("1", sw.getDPID());
+
+		port = op.searchPort("2", (short) 1);
+		assertNotNull(port);
+		assertTrue(port.getNumber() == 1);
+		sw = port.getSwitch();
+		assertNotNull(sw);
+		assertEquals("2", sw.getDPID());
+
+		port = op.searchPort("2", (short) 2);
+		assertNotNull(port);
+		assertTrue(port.getNumber() == 2);
+		sw = port.getSwitch();
+		assertNotNull(sw);
+		assertEquals("2", sw.getDPID());
 	}
 
 	/**
@@ -201,15 +295,69 @@
 	 */
 	@Test
 	public final void testRemovePort() {
-		fail("Not yet implemented");
+		ISwitchObject sw;
+		IPortObject port;
+		
+		sw = op.newSwitch("1");
+		sw.addPort(op.newPort((short) 1));
+		sw.addPort(op.newPort((short) 2));
+		
+		op.commit();
+
+		port = op.searchPort("1", (short) 1);
+		assertNotNull(port);
+		assertNotNull(op.searchPort("1", (short) 2));
+		assertNull(op.searchPort("1", (short) 3));
+
+		op.removePort(port);
+		op.commit();
+		
+		assertNull(op.searchPort("1", (short) 1));
+		port = op.searchPort("1", (short) 2);
+		assertNotNull(port);
+		
+		op.removePort(port);
+		op.commit();
+
+		assertNull(op.searchPort("1", (short) 1));
+		assertNull(op.searchPort("1", (short) 2));
 	}
 
 	/**
-	 * Test method for {@link net.onrc.onos.util.GraphDBOperation#removeDevice(net.onrc.onos.util.GraphDBConnection, net.floodlightcontroller.core.INetMapTopologyObjects.IDeviceObject)}.
+	 * Test method for {@link net.onrc.onos.util.GraphDBOperation#newDevice(net.onrc.onos.util.GraphDBConnection)}.
 	 */
 	@Test
-	public final void testRemoveDevice() {
-		fail("Not yet implemented");
+	public final void testNewDevice() {
+		assertFalse(testdb.getVertices("type", "device").iterator().hasNext());
+		
+		IDeviceObject device = op.newDevice();
+		device.setMACAddress("11:22:33:44:55:66");
+		device.setIPAddress("192.168.1.1");
+		op.commit();
+		
+		Iterator<Vertex> vertices = testdb.getVertices("type", "device").iterator();
+		assertTrue(vertices.hasNext());
+		Vertex v = vertices.next();
+		assertEquals("11:22:33:44:55:66", v.getProperty("dl_addr").toString());
+		assertEquals("192.168.1.1", v.getProperty("nw_addr").toString());
+	}
+
+	/**
+	 * Test method for {@link net.onrc.onos.util.GraphDBOperation#searchDevice(net.onrc.onos.util.GraphDBConnection, java.lang.String)}.
+	 */
+	@Test
+	public final void testSearchDevice() {
+		assertNull(op.searchDevice("11:22:33:44:55:66"));
+		assertNull(op.searchDevice("66:55:44:33:22:11"));
+
+		op.newDevice().setMACAddress("11:22:33:44:55:66");
+		op.commit();
+		
+		IDeviceObject device = op.searchDevice("11:22:33:44:55:66");
+		assertNotNull(device);
+		assertEquals("11:22:33:44:55:66", device.getMACAddress());
+		
+		assertNull(op.searchDevice("66:55:44:33:22:11"));
 	}
 
 	/**
@@ -217,15 +365,33 @@
 	 */
 	@Test
 	public final void testGetDevices() {
-		fail("Not yet implemented");
+		List<String> original_macs = Arrays.asList(
+				"11:11:11:11:11:11",
+				"22:22:22:22:22:22",
+				"33:33:33:33:33:33"
+				);
+		
+		for (String mac: original_macs) op.newDevice().setMACAddress(mac);
+		op.commit();
+		
+		Iterable<IDeviceObject> devices = op.getDevices();
+		List<String> macs = new ArrayList<String>();
+		for (IDeviceObject device: devices) macs.add(device.getMACAddress());
+		Collections.sort(macs);
+		assertArrayEquals(original_macs.toArray(), macs.toArray());
 	}
 
 	/**
-	 * Test method for {@link net.onrc.onos.util.GraphDBOperation#searchFlowPath(net.onrc.onos.util.GraphDBConnection, net.floodlightcontroller.util.FlowId)}.
+	 * Test method for {@link net.onrc.onos.util.GraphDBOperation#removeDevice(net.onrc.onos.util.GraphDBConnection, net.floodlightcontroller.core.INetMapTopologyObjects.IDeviceObject)}.
 	 */
 	@Test
-	public final void testSearchFlowPath() {
-		fail("Not yet implemented");
+	public final void testRemoveDevice() {
+		op.newDevice().setMACAddress("11:22:33:44:55:66");
+		op.commit();
+		
+		op.removeDevice(op.searchDevice("11:22:33:44:55:66"));
+		op.commit();
+		assertNull(op.searchDevice("11:22:33:44:55:66"));
 	}
 
 	/**
@@ -233,15 +399,30 @@
 	 */
 	@Test
 	public final void testNewFlowPath() {
-		fail("Not yet implemented");
+		FlowId flowId = new FlowId(10);
+		IFlowPath flowPath = op.newFlowPath();
+		flowPath.setFlowId(flowId.toString());
+		op.commit();
+
+		Iterator<IFlowPath> flows = op.getAllFlowPaths().iterator();
+		assertTrue(flows.hasNext());
+		assertEquals(flowId.toString(), flows.next().getFlowId());
 	}
 
 	/**
-	 * Test method for {@link net.onrc.onos.util.GraphDBOperation#removeFlowPath(net.onrc.onos.util.GraphDBConnection, net.floodlightcontroller.core.INetMapTopologyObjects.IFlowPath)}.
+	 * Test method for {@link net.onrc.onos.util.GraphDBOperation#searchFlowPath(net.onrc.onos.util.GraphDBConnection, net.floodlightcontroller.util.FlowId)}.
 	 */
 	@Test
-	public final void testRemoveFlowPath() {
-		fail("Not yet implemented");
+	public final void testSearchFlowPath() {
+		FlowId flowId = new FlowId(20);
+		assertNull(op.searchFlowPath(flowId));
+
+		op.newFlowPath().setFlowId(flowId.toString());
+		op.commit();
+		
+		IFlowPath flowPath = op.searchFlowPath(flowId);
+		assertNotNull(flowPath);
+		assertEquals(flowId.toString(), flowPath.getFlowId());
 	}
 
 	/**
@@ -249,7 +430,38 @@
 	 */
 	@Test
 	public final void testGetFlowPathByFlowEntry() {
-		fail("Not yet implemented");
+		FlowId flowId10 = new FlowId(10);
+		FlowId flowId20 = new FlowId(20);
+		IFlowPath flowPath10 = op.newFlowPath();
+		IFlowPath flowPath20 = op.newFlowPath();
+		IFlowEntry flowEntry10 = op.newFlowEntry();
+		IFlowEntry flowEntry20 = op.newFlowEntry();
+		IFlowEntry flowEntry30 = op.newFlowEntry();
+		FlowEntryId flowEntryId10 = new FlowEntryId(10); 
+		FlowEntryId flowEntryId20 = new FlowEntryId(20); 
+		FlowEntryId flowEntryId30 = new FlowEntryId(30); 
+		flowEntry10.setFlowEntryId(flowEntryId10.toString());
+		flowEntry20.setFlowEntryId(flowEntryId20.toString());
+		flowEntry30.setFlowEntryId(flowEntryId30.toString());
+		flowPath10.setFlowId(flowId10.toString());
+		flowPath10.addFlowEntry(flowEntry10);
+		flowPath20.setFlowId(flowId20.toString());
+		flowPath20.addFlowEntry(flowEntry20);
+		op.commit();
+
+		flowEntry10 = op.searchFlowEntry(flowEntryId10);
+		IFlowPath obtainedFlowPath = op.getFlowPathByFlowEntry(flowEntry10);
+		assertNotNull(obtainedFlowPath);
+		assertEquals(flowId10.toString(), obtainedFlowPath.getFlowId());
+		
+		flowEntry20 = op.searchFlowEntry(flowEntryId20);
+		obtainedFlowPath = op.getFlowPathByFlowEntry(flowEntry20);
+		assertNotNull(obtainedFlowPath);
+		assertEquals(flowId20.toString(), obtainedFlowPath.getFlowId());
+		
+		flowEntry30 = op.searchFlowEntry(flowEntryId30);
+		obtainedFlowPath = op.getFlowPathByFlowEntry(flowEntry30);
+		assertNull(obtainedFlowPath);
 	}
 
 	/**
@@ -257,15 +469,43 @@
 	 */
 	@Test
 	public final void testGetAllFlowPaths() {
-		fail("Not yet implemented");
+		List<FlowId> flowids = Arrays.asList(
+				new FlowId(10), new FlowId(20), new FlowId(30)
+				);
+		
+		for (FlowId flowId: flowids)
+			op.newFlowPath().setFlowId(flowId.toString());
+		op.commit();
+
+		List<String> actual_ids = new ArrayList<String>();
+		for (IFlowPath flowPath: op.getAllFlowPaths()) actual_ids.add(flowPath.getFlowId());
+		Collections.sort(actual_ids);
+
+		List<String> expected_ids = new ArrayList<String>();
+		for (FlowId flowid: flowids) expected_ids.add(flowid.toString());
+		Collections.sort(expected_ids);
+		
+		assertArrayEquals(expected_ids.toArray(), actual_ids.toArray());
 	}
 
 	/**
-	 * Test method for {@link net.onrc.onos.util.GraphDBOperation#searchFlowEntry(net.onrc.onos.util.GraphDBConnection, net.floodlightcontroller.util.FlowEntryId)}.
+	 * Test method for {@link net.onrc.onos.util.GraphDBOperation#removeFlowPath(net.onrc.onos.util.GraphDBConnection, net.floodlightcontroller.core.INetMapTopologyObjects.IFlowPath)}.
 	 */
 	@Test
-	public final void testSearchFlowEntry() {
-		fail("Not yet implemented");
+	public final void testRemoveFlowPath() {
+		FlowId flowId10 = new FlowId(10);
+		FlowId flowId20 = new FlowId(20);
+		op.newFlowPath().setFlowId(flowId10.toString());
+		op.newFlowPath().setFlowId(flowId20.toString());
+		op.commit();
+		
+		IFlowPath flowPath = op.searchFlowPath(flowId10);
+		assertNotNull(flowPath);
+		op.removeFlowPath(flowPath);
+		op.commit();
+		
+		assertNull(op.searchFlowPath(flowId10));
+		assertNotNull(op.searchFlowPath(flowId20));
 	}
 
 	/**
@@ -273,15 +513,38 @@
 	 */
 	@Test
 	public final void testNewFlowEntry() {
-		fail("Not yet implemented");
+		IFlowEntry flowEntry = op.newFlowEntry();
+		FlowEntryId flowEntryId = new FlowEntryId();
+		flowEntryId.setValue(12345);
+		flowEntry.setFlowEntryId(flowEntryId.toString());
+		op.commit();
+		
+		flowEntry = op.searchFlowEntry(flowEntryId);
+		assertNotNull(flowEntry);
+		assertEquals(flowEntry.getFlowEntryId(), flowEntryId.toString());		
 	}
 
 	/**
-	 * Test method for {@link net.onrc.onos.util.GraphDBOperation#removeFlowEntry(net.onrc.onos.util.GraphDBConnection, net.floodlightcontroller.core.INetMapTopologyObjects.IFlowEntry)}.
+	 * Test method for {@link net.onrc.onos.util.GraphDBOperation#searchFlowEntry(net.onrc.onos.util.GraphDBConnection, net.floodlightcontroller.util.FlowEntryId)}.
 	 */
 	@Test
-	public final void testRemoveFlowEntry() {
-		fail("Not yet implemented");
+	public final void testSearchFlowEntry() {
+		FlowEntryId flowEntryId10 = new FlowEntryId();
+		flowEntryId10.setValue(10);
+		FlowEntryId flowEntryId20 = new FlowEntryId();
+		flowEntryId20.setValue(20);
+		FlowEntryId flowEntryId30 = new FlowEntryId();
+		flowEntryId30.setValue(30);
+		
+		op.newFlowEntry().setFlowEntryId(flowEntryId10.toString());
+		op.newFlowEntry().setFlowEntryId(flowEntryId20.toString());
+		op.commit();
+		
+		assertNull(op.searchFlowEntry(flowEntryId30));
+		IFlowEntry flowEntry = op.searchFlowEntry(flowEntryId10);
+		assertEquals(flowEntry.getFlowEntryId(), flowEntryId10.toString());
+		flowEntry = op.searchFlowEntry(flowEntryId20);
+		assertEquals(flowEntry.getFlowEntryId(), flowEntryId20.toString());
 	}
 
 	/**
@@ -289,31 +552,43 @@
 	 */
 	@Test
 	public final void testGetAllFlowEntries() {
-		fail("Not yet implemented");
+		List<FlowEntryId> flowEntryIds = Arrays.asList(
+				new FlowEntryId(10), new FlowEntryId(20), new FlowEntryId(30)
+				);
+		
+		for (FlowEntryId flowEntryId: flowEntryIds)
+			op.newFlowEntry().setFlowEntryId(flowEntryId.toString());
+		op.commit();
+
+		List<String> actual_ids = new ArrayList<String>();
+		for (IFlowEntry flowEntry: op.getAllFlowEntries()) actual_ids.add(flowEntry.getFlowEntryId());
+		Collections.sort(actual_ids);
+
+		List<String> expected_ids = new ArrayList<String>();
+		for (FlowEntryId flowEntryId: flowEntryIds) expected_ids.add(flowEntryId.toString());
+		Collections.sort(expected_ids);
+		
+		assertArrayEquals(expected_ids.toArray(), actual_ids.toArray());
 	}
 
 	/**
-	 * Test method for {@link net.onrc.onos.util.GraphDBOperation#getAllSwitchNotUpdatedFlowEntries(net.onrc.onos.util.GraphDBConnection)}.
+	 * Test method for {@link net.onrc.onos.util.GraphDBOperation#removeFlowEntry(net.onrc.onos.util.GraphDBConnection, net.floodlightcontroller.core.INetMapTopologyObjects.IFlowEntry)}.
 	 */
 	@Test
-	public final void testGetAllSwitchNotUpdatedFlowEntries() {
-		fail("Not yet implemented");
-	}
-
-	/**
-	 * Test method for {@link net.onrc.onos.util.GraphDBOperation#getAllSwitches(net.onrc.onos.util.GraphDBConnection)}.
-	 */
-	@Test
-	public final void testGetAllSwitches() {
-		fail("Not yet implemented");
-	}
-
-	/**
-	 * Test method for {@link net.onrc.onos.util.GraphDBOperation#getInactiveSwitches(net.onrc.onos.util.GraphDBConnection)}.
-	 */
-	@Test
-	public final void testGetInactiveSwitches() {
-		fail("Not yet implemented");
+	public final void testRemoveFlowEntry() {
+		FlowEntryId flowEntryId10 = new FlowEntryId(10);
+		FlowEntryId flowEntryId20 = new FlowEntryId(20);
+		op.newFlowEntry().setFlowEntryId(flowEntryId10.toString());
+		op.newFlowEntry().setFlowEntryId(flowEntryId20.toString());
+		op.commit();
+		
+		IFlowEntry flowEntry = op.searchFlowEntry(flowEntryId10);
+		assertNotNull(flowEntry);
+		op.removeFlowEntry(flowEntry);
+		op.commit();
+		
+		assertNull(op.searchFlowEntry(flowEntryId10));
+		assertNotNull(op.searchFlowEntry(flowEntryId20));
 	}
 
 }