diff --git a/conf/onos.properties b/conf/onos.properties
index e77e6e0..f1244df 100644
--- a/conf/onos.properties
+++ b/conf/onos.properties
@@ -12,5 +12,7 @@
 net.floodlightcontroller.core.FloodlightProvider.workerthreads = 16
 net.floodlightcontroller.forwarding.Forwarding.idletimeout = 5
 net.floodlightcontroller.forwarding.Forwarding.hardtimeout = 0
-net.onrc.onos.ofcontroller.floodlightlistener.NetworkGraphPublisher.dbconf = /tmp/cassandra.titan
+#net.onrc.onos.ofcontroller.floodlightlistener.NetworkGraphPublisher.dbconf = /tmp/cassandra.titan
 net.onrc.onos.datagrid.HazelcastDatagrid.datagridConfig = conf/hazelcast.xml
+net.onrc.onos.ofcontroller.floodlightlistener.NetworkGraphPublisher.dbconf = /tmp/ramcloud.conf
+net.onrc.onos.ofcontroller.floodlightlistener.NetworkGraphPublisher.graph_db_store = ramcloud
diff --git a/conf/ramcloud.conf b/conf/ramcloud.conf
new file mode 100644
index 0000000..84b4ff2
--- /dev/null
+++ b/conf/ramcloud.conf
@@ -0,0 +1 @@
+ramcloud.coordinator=fast+udp:host=10.128.100.36,port=12246
diff --git a/lib/blueprints-ramcloud-graph-2.4.0.jar b/lib/blueprints-ramcloud-graph-2.4.0.jar
new file mode 100644
index 0000000..f796c94
--- /dev/null
+++ b/lib/blueprints-ramcloud-graph-2.4.0.jar
Binary files differ
diff --git a/lib/blueprints-ramcloud-graph-2.5.0.jar b/lib/blueprints-ramcloud-graph-2.5.0.jar
new file mode 100644
index 0000000..7d0080c
--- /dev/null
+++ b/lib/blueprints-ramcloud-graph-2.5.0.jar
Binary files differ
diff --git a/pom.xml b/pom.xml
index 0963968..55e6378 100644
--- a/pom.xml
+++ b/pom.xml
@@ -8,7 +8,7 @@
   <artifactId>onos</artifactId>
   <version>0.1.0</version>
   <packaging>jar</packaging>
-  <name>ONOS</name>
+  <name>ONOS-RAMLCloud</name>
   <url>http://onlab.us/</url>
   <repositories>
     <repository>
@@ -286,7 +286,12 @@
     <dependency>
       <groupId>com.tinkerpop.blueprints</groupId>
       <artifactId>blueprints-core</artifactId>
-      <version>2.3.0</version>
+      <version>2.4.0</version>
+    </dependency>
+    <dependency>
+      <groupId>com.hazelcast</groupId>
+      <artifactId>hazelcast</artifactId>
+      <version>3.0.2</version>
     </dependency>
     <dependency>
       <groupId>com.hazelcast</groupId>
@@ -454,5 +459,10 @@
       <version>0.1.0</version>
     </dependency>
     -->
+    <dependency>
+      <groupId>com.tinkerpop.blueprints.impls.ramcloud</groupId>
+      <artifactId>blueprints-ramcloud-graph</artifactId>
+      <version>2.5.0</version>
+    </dependency>
   </dependencies>
 </project>
diff --git a/src/main/java/net/onrc/onos/graph/DBConnection.java b/src/main/java/net/onrc/onos/graph/DBConnection.java
new file mode 100644
index 0000000..dee458a
--- /dev/null
+++ b/src/main/java/net/onrc/onos/graph/DBConnection.java
@@ -0,0 +1,19 @@
+/*
+ * To change this template, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package net.onrc.onos.graph;
+
+/**
+ *
+ * @author nickkaranatsios
+ */
+public abstract class DBConnection implements IDBConnection {
+    public enum Transaction {
+        COMMIT, ROLLBACK
+    }
+
+    public enum GenerateEvent {
+        TRUE, FALSE
+    }
+}
diff --git a/src/main/java/net/onrc/onos/graph/DBOperation.java b/src/main/java/net/onrc/onos/graph/DBOperation.java
new file mode 100644
index 0000000..4512b48
--- /dev/null
+++ b/src/main/java/net/onrc/onos/graph/DBOperation.java
@@ -0,0 +1,416 @@
+/*
+ * To change this template, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package net.onrc.onos.graph;
+
+import com.tinkerpop.blueprints.Vertex;
+import com.tinkerpop.frames.FramedGraph;
+import com.tinkerpop.frames.structures.FramedVertexIterable;
+import com.tinkerpop.gremlin.java.GremlinPipeline;
+import java.util.ArrayList;
+import java.util.Iterator;
+import java.util.List;
+import net.onrc.onos.ofcontroller.core.INetMapTopologyObjects;
+import net.onrc.onos.ofcontroller.core.INetMapTopologyObjects.IBaseObject;
+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.IIpv4Address;
+import net.onrc.onos.ofcontroller.core.INetMapTopologyObjects.IPortObject;
+import net.onrc.onos.ofcontroller.core.INetMapTopologyObjects.ISwitchObject;
+import net.onrc.onos.ofcontroller.core.ISwitchStorage;
+import net.onrc.onos.ofcontroller.util.FlowEntryId;
+import net.onrc.onos.ofcontroller.util.FlowId;
+
+/**
+ *
+ * @author nickkaranatsios
+ */
+public abstract class DBOperation implements IDBOperation {
+
+	protected DBConnection conn;
+
+	/**
+	 * Search and get an active switch object with DPID.
+	 * @param dpid DPID of the switch 
+	 */
+	@Override
+	public ISwitchObject searchActiveSwitch(String dpid) {
+	    ISwitchObject sw = searchSwitch(dpid);
+	    if ((sw != null)
+		    && sw.getState().equals(ISwitchStorage.SwitchState.ACTIVE.toString())) {
+		return sw;
+	    }
+	    return null;
+	}
+	
+	/**
+	 * Create a new switch and return the created switch object.
+	 * @param dpid DPID of the switch
+	 */
+	@Override
+	public ISwitchObject newSwitch(final String dpid) {
+	    //System.out.println("newSwitch");
+	    ISwitchObject obj = (ISwitchObject) conn.getFramedGraph().addVertex(null, ISwitchObject.class);
+	    if (obj != null) {
+		obj.setType("switch");
+		obj.setDPID(dpid);
+	    }
+	    return obj;
+	}
+	
+	/**
+	 * Get all switch objects.
+	 */
+	@Override
+	public Iterable<ISwitchObject> getAllSwitches() {
+	    //System.out.println("getAllSwitches");
+	    Iterable<ISwitchObject> switches = conn.getFramedGraph().getVertices("type", "switch", ISwitchObject.class);
+	    return switches;
+	}
+
+	/**
+	 * Get all inactive switch objects.
+	 */
+	@Override
+	public Iterable<ISwitchObject> getInactiveSwitches() {
+	    //System.out.println("getInactiveSwitches");
+	    Iterable<ISwitchObject> switches = conn.getFramedGraph().getVertices("type", "switch", ISwitchObject.class);
+	    List<ISwitchObject> inactiveSwitches = new ArrayList<ISwitchObject>();
+
+	    for (ISwitchObject sw : switches) {
+		if (sw.getState().equals(ISwitchStorage.SwitchState.INACTIVE.toString())) {
+		    inactiveSwitches.add(sw);
+		}
+	    }
+	    return inactiveSwitches;
+	}
+	
+	/**
+	 * Get all flow entries objects where their switches are not updated.
+	 */
+	@Override
+	public Iterable<INetMapTopologyObjects.IFlowEntry> getAllSwitchNotUpdatedFlowEntries() {
+	    //TODO: Should use an enum for flow_switch_state
+	    return conn.getFramedGraph().getVertices("switch_state", "FE_SWITCH_NOT_UPDATED", INetMapTopologyObjects.IFlowEntry.class);
+
+	}
+
+	/**
+	 * Remove specified switch.
+	 * @param sw switch object to remove
+	 */
+	@Override
+	public void removeSwitch(ISwitchObject sw) {
+	    //System.out.println("removeSwitch");
+	    conn.getFramedGraph().removeVertex(sw.asVertex());
+	}
+
+	@Override
+	public IPortObject newPort(String dpid, Short portNum) {
+	    //System.out.println("newPort");
+	    IPortObject obj = (IPortObject) conn.getFramedGraph().addVertex(null, IPortObject.class);
+	    if (obj != null) {
+		obj.setType("port");
+		String id = dpid + portNum.toString();
+		obj.setPortId(id);
+		obj.setNumber(portNum);
+	    }
+	    return obj;
+	}
+
+	/**
+	* Create a port having specified port number.
+	*
+	* @param portNumber port number
+	*/
+	@Deprecated
+	public IPortObject newPort(Short portNumber) {
+	    IPortObject obj = (IPortObject) conn.getFramedGraph().addVertex(null, IPortObject.class);
+	    if (obj != null) {
+		obj.setType("port");
+		obj.setNumber(portNumber);
+	    }
+	    return obj;
+	}
+
+	/**
+	 * 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
+	 */
+	@Override
+	public IPortObject searchPort(String dpid, Short number) {
+	    FramedGraph fg = conn.getFramedGraph();
+	    if ( fg == null ) return null;
+	    String id = dpid + number.toString();
+	    Iterator<IPortObject> it = conn.getFramedGraph().getVertices("port_id", id, IPortObject.class).iterator();
+	    return (it.hasNext()) ? it.next() : null;
+
+	}
+
+	/**
+	 * Remove the specified switch port.
+	 * @param port switch port object to remove
+	 */
+	@Override
+	public void removePort(IPortObject port) {
+	    //System.out.println("removeProt");
+	    if (conn.getFramedGraph() != null) {
+		conn.getFramedGraph().removeVertex(port.asVertex());
+	    }
+	}
+
+	/**
+	 * Create and return a device object.
+	 */
+	@Override
+	public IDeviceObject newDevice() {
+	    //System.out.println("newDevice");
+	    IDeviceObject obj = (IDeviceObject) conn.getFramedGraph().addVertex(null, IDeviceObject.class);
+	    if (obj != null) {
+		obj.setType("device");
+	    }
+	    return obj;
+	}
+
+	/**
+	 * Get all devices.
+	 */
+	@Override
+	public Iterable<IDeviceObject> getDevices() {
+	    //System.out.println("getDeiveces");
+	    return conn.getFramedGraph() != null ? conn.getFramedGraph().getVertices("type", "device", IDeviceObject.class) : null;
+	}
+
+	/**
+	 * Remove the specified device.
+	 * @param dev a device object to remove
+	 */
+	@Override
+	public void removeDevice(IDeviceObject dev) {
+	    //System.out.println("removeDevice");
+	    if (conn.getFramedGraph() != null) {
+		conn.getFramedGraph().removeVertex(dev.asVertex());
+	    }
+	}
+	
+	/**
+	* Create and return a flow path object.
+	*/
+	@Override
+	public IFlowPath newFlowPath() {
+	    //System.out.println("newFlowPath");
+	    IFlowPath flowPath = (IFlowPath)conn.getFramedGraph().addVertex(null, IFlowPath.class);
+	    //System.out.println("flowPath : " + flowPath);
+	    if (flowPath != null) {
+		flowPath.setType("flow");
+	    }
+	    return flowPath;
+	}
+
+	/**
+	 * Get a flow path object with a flow entry.
+	 * @param flowEntry flow entry object
+	 */
+	@Override
+	public IFlowPath getFlowPathByFlowEntry(INetMapTopologyObjects.IFlowEntry flowEntry) {
+	    GremlinPipeline<Vertex, IFlowPath> pipe = new GremlinPipeline<Vertex, IFlowPath>();
+	    pipe.start(flowEntry.asVertex());
+	    pipe.out("flow");
+	    FramedVertexIterable<IFlowPath> r = new FramedVertexIterable(conn.getFramedGraph(), (Iterable) pipe, IFlowPath.class);
+	    return r.iterator().hasNext() ? r.iterator().next() : null;
+	}
+
+
+	/**
+	* Search and get a switch object with DPID.
+	*
+	* @param dpid DPID of the switch
+	*/
+	@Override
+	public ISwitchObject searchSwitch(final String dpid) {
+	    FramedGraph fg = conn.getFramedGraph();
+	    if ( fg == null ) return null;
+	    Iterator<ISwitchObject> it = conn.getFramedGraph().getVertices("dpid", dpid, ISwitchObject.class).iterator();
+	    return (it.hasNext()) ? it.next() : null;
+	}
+
+	/**
+	 * Get all active switch objects.
+	 */
+	@Override
+	public Iterable<ISwitchObject> getActiveSwitches() {
+	    Iterable<ISwitchObject> switches = conn.getFramedGraph().getVertices("type", "switch", ISwitchObject.class);
+	    List<ISwitchObject> activeSwitches = new ArrayList<ISwitchObject>();
+
+	    for (ISwitchObject sw : switches) {
+		if (sw.getState().equals(ISwitchStorage.SwitchState.ACTIVE.toString())) {
+		    activeSwitches.add(sw);
+		}
+	    }
+	    return activeSwitches;
+	}
+
+	/**
+	 * Search and get a device object having specified MAC address.
+	 * @param macAddr MAC address to search and get
+	 */
+	@Override
+	public IDeviceObject searchDevice(String macAddr) {
+	    FramedGraph fg = conn.getFramedGraph();
+	    if ( fg == null ) return null;
+	    Iterator<IDeviceObject> it = conn.getFramedGraph().getVertices("dl_addr", macAddr, IDeviceObject.class).iterator();
+	    return (it.hasNext()) ? it.next() : null;
+	}
+
+	/**
+	 * Search and get a flow path object with specified flow ID.
+	 * @param flowId flow ID to search
+	 */
+	@Override
+	public IFlowPath searchFlowPath(final FlowId flowId) {
+	    FramedGraph fg = conn.getFramedGraph();
+	    if ( fg == null ) return null;
+	    Iterator<IFlowPath> it = conn.getFramedGraph().getVertices("flow_id", flowId.toString(), IFlowPath.class).iterator();
+	    return (it.hasNext()) ? it.next() : null;
+	}
+
+	/**
+	 * Get all flow path objects.
+	 */
+	@Override
+	public Iterable<IFlowPath> getAllFlowPaths() {
+	    //System.out.println("getAllFlowPaths");
+	    Iterable<IFlowPath> flowPaths = conn.getFramedGraph().getVertices("type", "flow", IFlowPath.class);
+
+	    List<IFlowPath> nonNullFlows = new ArrayList<IFlowPath>();
+
+	    for (IFlowPath fp : flowPaths) {
+		if (fp.getFlowId() != null) {
+		    nonNullFlows.add(fp);
+		}
+	    }
+	    return nonNullFlows;
+	}
+	
+	/**
+	 * Remove the specified flow path.
+	 * @param flowPath flow path object to remove
+	 */
+	@Override
+	public void removeFlowPath(IFlowPath flowPath) {
+	    //System.out.println("removeFlowPath");
+	    conn.getFramedGraph().removeVertex(flowPath.asVertex());
+	}
+	
+	/**
+	 * Search and get a flow entry object with flow entry ID.
+	 * @param flowEntryId flow entry ID to search
+	 */
+	@Override
+	public IFlowEntry searchFlowEntry(FlowEntryId flowEntryId) {
+	    FramedGraph fg = conn.getFramedGraph();
+	    if ( fg == null ) return null;
+	    Iterator<IFlowEntry> it = conn.getFramedGraph().getVertices("flow_entry_id", flowEntryId.toString(), IFlowEntry.class).iterator();
+	    return (it.hasNext()) ? it.next() : null;
+	}
+
+	/**
+	 * Get all flow entry objects.
+	 */
+	@Override
+	public Iterable<IFlowEntry> getAllFlowEntries() {
+	    return conn.getFramedGraph().getVertices("type", "flow_entry", IFlowEntry.class);
+	}
+
+	/**
+	 * Remove the specified flow entry.
+	 * @param flowEntry flow entry object to remove
+	 */
+	@Override
+	public void removeFlowEntry(IFlowEntry flowEntry) {
+	    //System.out.println("removeFlowEntry");
+	    conn.getFramedGraph().removeVertex(flowEntry.asVertex());
+	}
+	
+	/**
+	 * Create and return a flow entry object.
+	 */
+	@Override
+	public IFlowEntry newFlowEntry() {
+	    //System.out.println("newFlowEntry");
+	    IFlowEntry flowEntry = (IFlowEntry) conn.getFramedGraph().addVertex(null, IFlowEntry.class);
+	    if (flowEntry != null) {
+		flowEntry.setType("flow_entry");
+	    }
+	    return flowEntry;
+	}
+
+
+	public IIpv4Address newIpv4Address() {
+		return newVertex("ipv4Address", IIpv4Address.class);
+	}
+	
+	private <T extends IBaseObject> T newVertex(String type, Class<T> vertexType) {
+		T newVertex = (T) conn.getFramedGraph().addVertex(null, vertexType);
+		if (newVertex != null) {
+			newVertex.setType(type);
+		}
+		return newVertex;
+	}
+
+	public IIpv4Address searchIpv4Address(int intIpv4Address) {
+		return searchForVertex("ipv4_address", intIpv4Address, IIpv4Address.class);
+	}
+	
+	
+	public IIpv4Address ensureIpv4Address(int intIpv4Address) {
+		IIpv4Address ipv4Vertex = searchIpv4Address(intIpv4Address);
+		if (ipv4Vertex == null) {
+			ipv4Vertex = newIpv4Address();
+			ipv4Vertex.setIpv4Address(intIpv4Address);
+		}
+		return ipv4Vertex;
+	}	
+
+	
+	private <T> T searchForVertex(String propertyName, Object propertyValue, Class<T> vertexType) {
+		if (conn.getFramedGraph() != null) {
+			Iterator<T> it = conn.getFramedGraph().getVertices(propertyName, propertyValue, vertexType).iterator();
+			if (it.hasNext()) {
+				return it.next();
+			}
+		}
+		return null;
+	}
+
+	public void removeIpv4Address(IIpv4Address ipv4Address) {
+		//System.out.println("removeIpv4Address");
+		conn.getFramedGraph().removeVertex(ipv4Address.asVertex());
+	}
+
+	/**
+	 * Get the instance of GraphDBConnection assigned to this class.
+	 */
+	@Override
+	public IDBConnection getDBConnection() {
+	    return conn;
+	}	
+	
+	@Override
+	public void commit() {
+	    conn.commit();
+	}
+
+	@Override
+	public void rollback() {
+	    conn.rollback();
+	}
+
+	@Override
+	public void close() {
+	    conn.close();
+	}
+}
diff --git a/src/main/java/net/onrc/onos/graph/GraphDBManager.java b/src/main/java/net/onrc/onos/graph/GraphDBManager.java
new file mode 100644
index 0000000..ec7eb7f
--- /dev/null
+++ b/src/main/java/net/onrc/onos/graph/GraphDBManager.java
@@ -0,0 +1,58 @@
+/*
+ * To change this template, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package net.onrc.onos.graph;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+/**
+ *
+ * @author nickkaranatsios
+ */
+public class GraphDBManager {
+    private static ThreadLocal<HashMap<String, DBConnection>> connections = new ThreadLocal<HashMap<String, DBConnection>>();
+    private static DBOperation operation = null;
+    
+    static Map<String, DBConnection> getConnectionMap() {
+        if (connections.get() == null) {
+            connections.set(new HashMap<String, DBConnection>());
+        }
+        return connections.get();
+    }
+
+    public static DBOperation getDBOperation(final String dbStore, final String dbConfigFile) {
+	if (dbStore.equals("ramcloud")) {
+	    operation = new RamCloudDBOperation();
+	} else if (dbStore.equals("titan")) {
+	    operation = new TitanDBOperation();
+	}
+	if (operation != null) {
+	    operation.conn = GraphDBManager.getConnection(dbStore, dbConfigFile);
+	}
+        return operation;
+    }
+
+    public static DBConnection getConnection(final String dbStore, final String dbConfigFile) {
+        DBConnection conn = getConnectionMap().get(dbStore);
+        if (conn == null) {
+            if (dbStore.equals("ramcloud")) {
+                conn = new RamCloudDBConnection(dbConfigFile);
+            } else if (dbStore.equals("titan")) {
+                conn = new TitanDBConnection(dbConfigFile);
+            }
+
+            GraphDBManager.getConnectionMap().put(dbStore, conn);
+        } else {
+            GraphDBManager.getConnectionMap().get(dbStore);
+        }
+        return conn;
+    }
+
+    static List<DBConnection> getConnections() {
+        return new ArrayList<DBConnection>(getConnectionMap().values());
+    }
+}
diff --git a/src/main/java/net/onrc/onos/graph/IDBConnection.java b/src/main/java/net/onrc/onos/graph/IDBConnection.java
index 82ebba2..cd65ec0 100644
--- a/src/main/java/net/onrc/onos/graph/IDBConnection.java
+++ b/src/main/java/net/onrc/onos/graph/IDBConnection.java
@@ -1,13 +1,12 @@
 package net.onrc.onos.graph;
 
-import com.thinkaurelius.titan.core.TitanGraph;
 import com.tinkerpop.frames.FramedGraph;
 
 public interface IDBConnection {
-	public FramedGraph<TitanGraph> getFramedGraph();
-	public void addEventListener(final LocalGraphChangedListener listener);
-	public Boolean isValid();
-	public void commit();
-	public void rollback();
-	public void close();
+    public FramedGraph getFramedGraph();
+    public void addEventListener(final LocalGraphChangedListener listener);
+    public Boolean isValid();
+    public void commit();
+    public void rollback();
+    public void close();
 }
diff --git a/src/main/java/net/onrc/onos/graph/LocalTopologyEventListener.java b/src/main/java/net/onrc/onos/graph/LocalTopologyEventListener.java
index 40f5044..2778b55 100644
--- a/src/main/java/net/onrc/onos/graph/LocalTopologyEventListener.java
+++ b/src/main/java/net/onrc/onos/graph/LocalTopologyEventListener.java
@@ -9,13 +9,15 @@
 import com.tinkerpop.blueprints.Direction;
 import com.tinkerpop.blueprints.Edge;
 import com.tinkerpop.blueprints.Vertex;
+import com.tinkerpop.blueprints.impls.ramcloud.*;
+import java.util.Map;
 
 public class LocalTopologyEventListener implements LocalGraphChangedListener {
 	
 	protected final static Logger log = LoggerFactory.getLogger(LocalTopologyEventListener.class);
-	protected static GraphDBConnection conn;
+	protected static DBConnection conn;
 	
-	public LocalTopologyEventListener(GraphDBConnection conn) {
+	public LocalTopologyEventListener(DBConnection conn) {
 		LocalTopologyEventListener.conn = conn;		
 	}
 
@@ -33,7 +35,6 @@
 
 	}
 
-	@Override
 	public void edgeRemoved(Edge e) {
 		// TODO Auto-generated method stub
 		// Fire NetMapEvents (LinkRemoved, FlowEntryRemoved, HostRemoved, PortRemoved)
@@ -42,9 +43,9 @@
 		String label = edge.getLabel();
 		if (label.equals("link")) {
 			Vertex v = edge.getVertex(Direction.IN);
-			IPortObject src_port = conn.getFramedGraph().frame(v, IPortObject.class);
+			IPortObject src_port = (IPortObject) conn.getFramedGraph().frame(v, IPortObject.class);
 			v = edge.getVertex(Direction.OUT);
-			IPortObject dest_port = conn.getFramedGraph().frame(v, IPortObject.class);
+			IPortObject dest_port = (IPortObject) conn.getFramedGraph().frame(v, IPortObject.class);
 
 			log.debug("TopologyEvents: link broken {}", new Object []{src_port.getSwitch().getDPID(),
 																src_port.getNumber(),
@@ -71,7 +72,6 @@
 
 	}
 
-	@Override
 	public void vertexRemoved(Vertex vertex) {
 		// TODO Auto-generated method stub
 		// Generate NetMapEvents 
@@ -80,7 +80,7 @@
 		if (type.equals("port")) {
 			// port is removed...lets fire reconcile here directly for now
 			
-			IPortObject src_port = conn.getFramedGraph().frame(vertex, IPortObject.class);
+			IPortObject src_port = (IPortObject) conn.getFramedGraph().frame(vertex, IPortObject.class);
 			log.debug("TopologyEvents: Port removed: {}:{}",src_port.getSwitch().getDPID(),src_port.getNumber());
 
 			// NOTE: Old code/logic.
@@ -105,4 +105,11 @@
 		
 	}
 
+	public void vertexRemoved(Vertex vertex, Map<String, Object> props) {
+		throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
+	}
+
+	public void edgeRemoved(Edge edge, Map<String, Object> props) {
+		throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
+	}
 }
diff --git a/src/main/java/net/onrc/onos/graph/RamCloudDBConnection.java b/src/main/java/net/onrc/onos/graph/RamCloudDBConnection.java
new file mode 100644
index 0000000..4728e61
--- /dev/null
+++ b/src/main/java/net/onrc/onos/graph/RamCloudDBConnection.java
@@ -0,0 +1,126 @@
+/*
+ * To change this template, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package net.onrc.onos.graph;
+
+import com.tinkerpop.blueprints.Vertex;
+import com.tinkerpop.blueprints.impls.ramcloud.RamCloudGraph;
+import com.tinkerpop.frames.FramedGraph;
+import java.io.File;
+import java.util.Set;
+import org.apache.commons.configuration.Configuration;
+import org.apache.commons.configuration.ConfigurationException;
+import org.apache.commons.configuration.PropertiesConfiguration;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ *
+ * @author nickkaranatsios
+ */
+public class RamCloudDBConnection extends DBConnection {
+    private RamCloudGraph graph;
+    private static Logger log = LoggerFactory.getLogger(RamCloudDBConnection.class);
+    
+    //private static final ThreadLocal<RamCloudGraph> RamCloudThreadLocal = new ThreadLocal<RamCloudGraph>();
+
+    public RamCloudDBConnection(final String dbConfigFile) {
+        //final String coordinatorURL = open(getConfiguration(new File(dbConfigFile)));
+	//System.out.println("coordinatorURL "+ coordinatorURL);
+        //graph = new RamCloudGraph(coordinatorURL);
+	//graph = RamCloudThreadLocal.get();
+	//System.out.println("ThreadId = " + Thread.currentThread().getId() + " graph = " + graph);
+	graph = new RamCloudGraph("fast+udp:host=10.128.4.104,port=12246");
+	Set<String> s = graph.getIndexedKeys(Vertex.class);
+        if (!s.contains("dpid")) {
+            graph.createKeyIndex("dpid", Vertex.class);
+        }
+        if (!s.contains("port_id")) {
+            graph.createKeyIndex("port_id", Vertex.class);
+        }
+        if (!s.contains("type")) {
+            graph.createKeyIndex("type", Vertex.class);
+        }
+        if (!s.contains("dl_addr")) {
+            graph.createKeyIndex("dl_addr", Vertex.class);
+        }
+        if (!s.contains("flow_id")) {
+            graph.createKeyIndex("flow_id", Vertex.class);
+        }
+        if (!s.contains("flow_entry_id")) {
+            graph.createKeyIndex("flow_entry_id", Vertex.class);
+        }
+        if (!s.contains("switch_state")) {
+            graph.createKeyIndex("switch_state", Vertex.class);
+        }
+    }
+    
+    @Override
+    public FramedGraph getFramedGraph() {
+        if (isValid()) {
+            FramedGraph<RamCloudGraph> fg = new FramedGraph<RamCloudGraph>(graph);
+            return fg;
+        } else {
+            log.error("new FramedGraph failed");
+            return null;
+        }
+    }
+
+    @Override
+    public void addEventListener(LocalGraphChangedListener listener) {
+        //TO-DO
+    }
+
+    @Override
+    public Boolean isValid() {
+        return (graph != null);
+    }
+
+    @Override
+    public void commit() {
+        try {
+            graph.commit();
+        } catch (Exception e) {
+            log.error("{}", e.toString());
+        }
+    }
+
+    @Override
+    public void rollback() {
+        try {
+            graph.rollback();
+        } catch (Exception e) {
+            log.error("{}", e.toString());
+        }
+    }
+
+    @Override
+    public void close() {
+        commit();
+    }
+    
+     private static final Configuration getConfiguration(final File dirOrFile) {
+        if (dirOrFile == null) {
+            throw new IllegalArgumentException("Need to specify a configuration file or storage directory");
+        }
+
+        if (!dirOrFile.isFile()) {
+            throw new IllegalArgumentException("Location of configuration must be a file");
+        }
+
+        try {
+            return new PropertiesConfiguration(dirOrFile);
+        } catch (ConfigurationException e) {
+            throw new IllegalArgumentException("Could not load configuration at: " + dirOrFile, e);
+        }
+    }
+     
+     private String open(final Configuration configuration) {
+         final String coordinatorURL = configuration.getString("ramcloud.coordinator", null);
+         if (coordinatorURL == null) {
+             throw new RuntimeException("Configuration must contain a valid 'coordinatorURL' setting");
+         }
+         return coordinatorURL;
+     }
+}
diff --git a/src/main/java/net/onrc/onos/graph/RamCloudDBOperation.java b/src/main/java/net/onrc/onos/graph/RamCloudDBOperation.java
new file mode 100644
index 0000000..1487be7
--- /dev/null
+++ b/src/main/java/net/onrc/onos/graph/RamCloudDBOperation.java
@@ -0,0 +1,27 @@
+/*
+ * To change this template, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package net.onrc.onos.graph;
+
+import com.tinkerpop.blueprints.impls.ramcloud.RamCloudGraph;
+import com.tinkerpop.frames.FramedGraph;
+import net.onrc.onos.ofcontroller.core.INetMapTopologyObjects;
+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 org.apache.commons.configuration.Configuration;
+
+/**
+ *
+ * @author nickkaranatsios
+ */
+public class RamCloudDBOperation extends DBOperation {
+
+    public RamCloudDBOperation() {
+    }
+}
diff --git a/src/main/java/net/onrc/onos/graph/TitanDBConnection.java b/src/main/java/net/onrc/onos/graph/TitanDBConnection.java
new file mode 100644
index 0000000..f46e417
--- /dev/null
+++ b/src/main/java/net/onrc/onos/graph/TitanDBConnection.java
@@ -0,0 +1,122 @@
+/*
+ * To change this template, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package net.onrc.onos.graph;
+
+import com.thinkaurelius.titan.core.TitanFactory;
+import com.thinkaurelius.titan.core.TitanGraph;
+import com.tinkerpop.blueprints.TransactionalGraph;
+import com.tinkerpop.blueprints.Vertex;
+import com.tinkerpop.blueprints.util.wrappers.event.EventTransactionalGraph;
+import com.tinkerpop.frames.FramedGraph;
+import java.util.Set;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ *
+ * @author nickkaranatsios
+ */
+public class TitanDBConnection extends DBConnection {
+
+    private TitanGraph graph;
+    private static Logger log = LoggerFactory.getLogger(TitanDBConnection.class);
+    private EventTransactionalGraph<TitanGraph> eg;
+
+    public TitanDBConnection(final String dbConfigFile) {
+        graph = TitanFactory.open(dbConfigFile);
+        Set<String> s = graph.getIndexedKeys(Vertex.class);
+        if (!s.contains("dpid")) {
+            graph.createKeyIndex("dpid", Vertex.class);
+        }
+        if (!s.contains("port_id")) {
+            graph.createKeyIndex("port_id", Vertex.class);
+        }
+        if (!s.contains("type")) {
+            graph.createKeyIndex("type", Vertex.class);
+        }
+        if (!s.contains("dl_addr")) {
+            graph.createKeyIndex("dl_addr", Vertex.class);
+        }
+        if (!s.contains("flow_id")) {
+            graph.createKeyIndex("flow_id", Vertex.class);
+        }
+        if (!s.contains("flow_entry_id")) {
+            graph.createKeyIndex("flow_entry_id", Vertex.class);
+        }
+        if (!s.contains("switch_state")) {
+            graph.createKeyIndex("switch_state", Vertex.class);
+        }
+        graph.commit();
+        eg = new EventTransactionalGraph<TitanGraph>(graph);
+    }
+
+    class TransactionHandle {
+
+        protected TransactionalGraph tr;
+
+        public void create() {
+            tr = graph.newTransaction();
+        }
+    }
+
+    @Override
+    public FramedGraph getFramedGraph() {
+        if (isValid()) {
+            FramedGraph<TitanGraph> fg = new FramedGraph<TitanGraph>(graph);
+            return fg;
+        } else {
+            log.error("new FramedGraph failed");
+            return null;
+        }
+    }
+
+    @Override
+    public void addEventListener(LocalGraphChangedListener listener) {
+        EventTransactionalGraph<TitanGraph> eg = this.getEventGraph();
+        eg.addListener(listener);
+        log.debug("Registered listener {}", listener.getClass());
+    }
+
+    @Override
+    public Boolean isValid() {
+        return (graph != null || graph.isOpen());
+    }
+
+    @Override
+    public void commit() {
+        try {
+            graph.commit();
+        } catch (Exception e) {
+            log.error("{}", e.toString());
+        }
+    }
+
+    @Override
+    public void rollback() {
+        try {
+            graph.rollback();
+        } catch (Exception e) {
+            log.error("{}", e.toString());
+        }
+    }
+
+    @Override
+    public void close() {
+        commit();
+    }
+
+    /**
+     * Get EventTransactionalGraph of the titan graph.
+     *
+     * @return EventTransactionalGraph of the titan graph
+     */
+    private EventTransactionalGraph<TitanGraph> getEventGraph() {
+        if (isValid()) {
+            return eg;
+        } else {
+            return null;
+        }
+    }
+}
diff --git a/src/main/java/net/onrc/onos/graph/TitanDBOperation.java b/src/main/java/net/onrc/onos/graph/TitanDBOperation.java
new file mode 100644
index 0000000..1b211d6
--- /dev/null
+++ b/src/main/java/net/onrc/onos/graph/TitanDBOperation.java
@@ -0,0 +1,26 @@
+/*
+ * To change this template, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package net.onrc.onos.graph;
+
+import com.thinkaurelius.titan.core.TitanGraph;
+import com.tinkerpop.blueprints.Vertex;
+import com.tinkerpop.frames.FramedGraph;
+import com.tinkerpop.frames.structures.FramedVertexIterable;
+import com.tinkerpop.gremlin.java.GremlinPipeline;
+import java.util.ArrayList;
+import java.util.Iterator;
+import java.util.List;
+import net.onrc.onos.ofcontroller.core.INetMapTopologyObjects.*;
+import net.onrc.onos.ofcontroller.core.ISwitchStorage;
+import net.onrc.onos.ofcontroller.util.FlowEntryId;
+import net.onrc.onos.ofcontroller.util.FlowId;
+
+/**
+ *
+ * @author nickkaranatsios
+ */
+public class TitanDBOperation extends DBOperation {
+
+}
\ No newline at end of file
diff --git a/src/main/java/net/onrc/onos/graph/web/TopoDevicesResource.java b/src/main/java/net/onrc/onos/graph/web/TopoDevicesResource.java
index 18c1069..10e250e 100644
--- a/src/main/java/net/onrc/onos/graph/web/TopoDevicesResource.java
+++ b/src/main/java/net/onrc/onos/graph/web/TopoDevicesResource.java
@@ -2,7 +2,8 @@
 
 import java.util.Iterator;
 
-import net.onrc.onos.graph.GraphDBOperation;
+import net.onrc.onos.graph.DBOperation;
+import net.onrc.onos.graph.GraphDBManager;
 import net.onrc.onos.ofcontroller.core.INetMapTopologyObjects.IDeviceObject;
 
 import org.restlet.resource.Get;
@@ -12,7 +13,7 @@
 	
 	@Get("json")
 	public Iterator<IDeviceObject> retrieve() {
-		GraphDBOperation op = new GraphDBOperation("");
+		DBOperation op = GraphDBManager.getDBOperation("ramcloud", "/tmp/ramcloudconf");
 		
 		return op.getDevices().iterator();
 	}
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 33280a6..3ff6058 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/bgproute/BgpRoute.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/bgproute/BgpRoute.java
@@ -280,7 +280,7 @@
 		ScheduledExecutorService executor = Executors.newScheduledThreadPool(1);
 		topologyChangeDetectorTask = new SingletonTask(executor, new TopologyChangeDetector());
 
-		topologyNetService = new TopologyManager("");
+		topologyNetService = new TopologyManager(context);
 		
 		pathsWaitingOnArp = new HashMap<InetAddress, Path>();
 		prefixesWaitingOnArp = Multimaps.synchronizedSetMultimap(
diff --git a/src/main/java/net/onrc/onos/ofcontroller/core/ILinkStorage.java b/src/main/java/net/onrc/onos/ofcontroller/core/ILinkStorage.java
index 8889092..6b285f4 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/core/ILinkStorage.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/core/ILinkStorage.java
@@ -10,7 +10,7 @@
     /*
 	 * Init with Storage conf
 	 */
-	public void init(String conf);
+	public void init(final String dbStore, final String conf);
 	
 	/*
 	 * Generic operation method
@@ -60,7 +60,8 @@
 	 * @param dpid DPID of desired switch.
 	 * @return List of reverse links. Empty list if no port was found.
 	 */
-	public List<Link> getReverseLinks(String dpid);
+
+        public List<Link> getReverseLinks(String dpid);
 
 	public List<Link> getActiveLinks();
 
diff --git a/src/main/java/net/onrc/onos/ofcontroller/core/INetMapStorage.java b/src/main/java/net/onrc/onos/ofcontroller/core/INetMapStorage.java
index b052540..2cf0e18 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/core/INetMapStorage.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/core/INetMapStorage.java
@@ -14,6 +14,6 @@
 		DELETE, // Delete the object
 		UPDATE  // Update the object if exists or CREATE/INSERT if does not exist
 	}
-	public void init(String conf);
+	public void init(final String dbStore, final String conf);
 	public void close();
 }
diff --git a/src/main/java/net/onrc/onos/ofcontroller/core/ISwitchStorage.java b/src/main/java/net/onrc/onos/ofcontroller/core/ISwitchStorage.java
index 2cfab3f..8dd2f16 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/core/ISwitchStorage.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/core/ISwitchStorage.java
@@ -16,7 +16,8 @@
 	/*
 	 * Initialize
 	 */
-	public void init(String conf);
+	public void init(final String dbStore, final String conf);
+
 	/*
 	 * Update the switch details
 	 */
@@ -39,7 +40,7 @@
 	public boolean deactivateSwitch(String dpid);
 	/*
 	 * Update the port details
-	 */
+	 */	
 	public boolean updatePort(String dpid, short port, int state, String desc);
 	/*
 	 * Associate a port on switch
@@ -49,7 +50,6 @@
 	 * Delete a port on a switch by num
 	 */
 	public boolean deletePort(String dpid, short port);
-
 	/**
 	 * Get list of all ports on the switch specified by given DPID.
 	 *
diff --git a/src/main/java/net/onrc/onos/ofcontroller/core/internal/DeviceStorageImpl.java b/src/main/java/net/onrc/onos/ofcontroller/core/internal/DeviceStorageImpl.java
index dedf607..e915614 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/core/internal/DeviceStorageImpl.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/core/internal/DeviceStorageImpl.java
@@ -7,7 +7,9 @@
 
 import net.floodlightcontroller.devicemanager.IDevice;
 import net.floodlightcontroller.devicemanager.SwitchPort;
-import net.onrc.onos.graph.GraphDBOperation;
+import net.floodlightcontroller.packet.IPv4;
+import net.onrc.onos.graph.DBOperation;
+import net.onrc.onos.graph.GraphDBManager;
 import net.onrc.onos.ofcontroller.core.IDeviceStorage;
 import net.onrc.onos.ofcontroller.core.INetMapTopologyObjects.IDeviceObject;
 import net.onrc.onos.ofcontroller.core.INetMapTopologyObjects.IIpv4Address;
@@ -22,52 +24,59 @@
 import com.google.common.collect.Lists;
 import com.google.common.net.InetAddresses;
 import com.thinkaurelius.titan.core.TitanException;
-
 /**
  * This is the class for storing the information of devices into CassandraDB
+ *
  * @author Pankaj
  */
 public class DeviceStorageImpl implements IDeviceStorage {
-	protected final static Logger log = LoggerFactory.getLogger(DeviceStorageImpl.class);
-	
-	private GraphDBOperation ope;
 
-	/***
-	 * Initialize function. Before you use this class, please call this method
-	 * @param conf configuration file for Cassandra DB
-	 */
+	private DBOperation ope;
+	protected final static Logger log = LoggerFactory.getLogger(SwitchStorageImpl.class);
+	/**
+	* *
+	* Initialize function. Before you use this class, please call this method
+	*
+	* @param conf configuration file for Cassandra DB
+	*/
 	@Override
-	public void init(String conf) {
+	public void init(final String dbStore, final String conf) {
 		try {
-			ope = new GraphDBOperation(conf);
-		} catch (TitanException e) {
-			log.error("Couldn't open graph operation", e);
+			ope = GraphDBManager.getDBOperation("ramcloud", "/tmp/ramcloudconf");
+			//ope = GraphDBManager.getDBOperation(dbStore, conf);
+		} catch (Exception e) {
+			log.error(e.getMessage());
 		}
-	}	
-	
-	/***
-	 * Finalize/close function. After you use this class, please call this method.
-	 * It will close the DB connection.
-	 */
+	}
+
+	/**
+	* *
+	* Finalize/close function. After you use this class, please call this
+	* method. It will close the DB connection.
+	*/
 	@Override
 	public void close() {
 		ope.close();
 	}
-	
-	/***
-	 * Finalize/close function. After you use this class, please call this method.
-	 * It will close the DB connection. This is for Java garbage collection.
-	 */
+
+	/**
+	* *
+	* Finalize/close function. After you use this class, please call this
+	* method. It will close the DB connection. This is for Java garbage
+	* collection.
+	*/
 	@Override
 	public void finalize() {
 		close();
 	}
 
-	/***
-	 * This function is for adding the device into the DB.
-	 * @param device The device you want to add into the DB.
-	 * @return IDeviceObject which was added in the DB. 
-	 */
+	/**
+	* *
+	* This function is for adding the device into the DB.
+	*
+	* @param device The device you want to add into the DB.
+	* @return IDeviceObject which was added in the DB.
+	*/
 	@Override
 	public IDeviceObject addDevice(IDevice device) {
 		IDeviceObject obj = null;
@@ -107,12 +116,13 @@
  		
 		return obj;		
 	}
-
-	/***
-	 * This function is for updating the Device properties.
-	 * @param device The device you want to add into the DB.
-	 * @return IDeviceObject which was added in the DB. 
-	 */
+	/**
+	* *
+	* This function is for updating the Device properties.
+	*
+	* @param device The device you want to add into the DB.
+	* @return IDeviceObject which was added in the DB.
+	*/
 	@Override
 	public IDeviceObject updateDevice(IDevice device) {
 		return addDevice(device);
@@ -152,16 +162,18 @@
 		
 		ope.removeDevice(deviceObject);
 	}
-
-	/***
-	 * This function is for getting the Device from the DB by Mac address of the device.
-	 * @param mac The device mac address you want to get from the DB.
-	 * @return IDeviceObject you want to get.
-	 */
-	@Override
-	public IDeviceObject getDeviceByMac(String mac) {
-		return ope.searchDevice(mac);
-	}
+    /**
+     * *
+     * This function is for getting the Device from the DB by Mac address of the
+     * device.
+     *
+     * @param mac The device mac address you want to get from the DB.
+     * @return IDeviceObject you want to get.
+     */
+    @Override
+    public IDeviceObject getDeviceByMac(String mac) {
+        return ope.searchDevice(mac);
+    }
 
 	/***
 	 * This function is for getting the Device from the DB by IP address of the device.
@@ -183,26 +195,28 @@
 		}
 	}
 
-	/***
-	 * This function is for changing the Device attachment point.
-	 * @param device The device you want change the attachment point
-	 */
+	/**
+	* *
+	* This function is for changing the Device attachment point.
+	*
+	* @param device The device you want change the attachment point
+	*/
 	@Override
 	public void changeDeviceAttachments(IDevice device) {
 		IDeviceObject obj = null;
- 		try {
-            if ((obj = ope.searchDevice(device.getMACAddressString())) != null) {
-                log.debug("Changing device ports {}: found existing device", device.getMACAddressString());
-                changeDeviceAttachments(device, obj);
-                ope.commit();
-            } else {
-   				log.debug("failed to search device...now adding {}", device.getMACAddressString());
-   				addDevice(device);
-            }
+		try {
+			if ((obj = ope.searchDevice(device.getMACAddressString())) != null) {
+				log.debug("Changing device ports {}: found existing device", device.getMACAddressString());
+				changeDeviceAttachments(device, obj);
+				ope.commit();
+			} else {
+				log.debug("failed to search device...now adding {}", device.getMACAddressString());
+				addDevice(device);
+			}
 		} catch (TitanException e) {
 			ope.rollback();
 			log.error(":addDevice mac:{} failed", device.getMACAddressString());
-		}	
+		}
 	}
 	
 	/***
@@ -259,16 +273,15 @@
 		log.debug("Changing IP address for {} to {}", device.getMACAddressString(),
 				device.getIPv4Addresses());
 		IDeviceObject obj;
-  		try {
-  			if ((obj = ope.searchDevice(device.getMACAddressString())) != null) {
-  				changeDeviceIpv4Addresses(device, obj);
-  	            
-              	ope.commit();
-  			} else {
-            	log.error(":changeDeviceIPv4Address mac:{} failed", device.getMACAddressString());
-            }		
-  		} catch (TitanException e) {
-  			ope.rollback();
+		try {
+			if ((obj = ope.searchDevice(device.getMACAddressString())) != null) {
+				changeDeviceIpv4Addresses(device, obj);
+				ope.commit();
+			} else {
+				log.error(":changeDeviceIPv4Address mac:{} failed", device.getMACAddressString());
+			}
+		} catch (TitanException e) {
+			ope.rollback();
 			log.error(":changeDeviceIPv4Address mac:{} failed due to exception {}", device.getMACAddressString(), e);
 		}
 	}
diff --git a/src/main/java/net/onrc/onos/ofcontroller/core/internal/LinkStorageImpl.java b/src/main/java/net/onrc/onos/ofcontroller/core/internal/LinkStorageImpl.java
index 7c8541d..bf6e2e9 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/core/internal/LinkStorageImpl.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/core/internal/LinkStorageImpl.java
@@ -4,7 +4,7 @@
 import java.util.List;
 
 import net.floodlightcontroller.routing.Link;
-import net.onrc.onos.graph.GraphDBOperation;
+import net.onrc.onos.graph.DBOperation;
 import net.onrc.onos.ofcontroller.core.ILinkStorage;
 import net.onrc.onos.ofcontroller.core.INetMapTopologyObjects.IDeviceObject;
 import net.onrc.onos.ofcontroller.core.INetMapTopologyObjects.IPortObject;
@@ -15,22 +15,28 @@
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
+import com.tinkerpop.blueprints.Vertex;
+import com.tinkerpop.pipes.PipeFunction;
+import com.tinkerpop.pipes.transform.PathPipe;
+import net.onrc.onos.graph.GraphDBManager;
+
 /**
  * This is the class for storing the information of links into GraphDB
  */
 public class LinkStorageImpl implements ILinkStorage {
-	
-	protected final static Logger log = LoggerFactory.getLogger(LinkStorageImpl.class);
-	protected GraphDBOperation op;
 
-	
+	protected final static Logger log = LoggerFactory.getLogger(LinkStorageImpl.class);
+	protected DBOperation dbop;
+
 	/**
 	 * 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) {
-		this.op = new GraphDBOperation(conf);
+	public void init(final String dbStore, final String conf) {
+		//this.dbop = GraphDBManager.getDBOperation(dbStore, conf);
+		this.dbop = GraphDBManager.getDBOperation("ramcloud", "/tmp/ramcloudconf");
+
 	}
 
 	// Method designing policy:
@@ -56,11 +62,11 @@
 			if (link != null) {
 				try {
 					if (addLinkImpl(link)) {
-						op.commit();
+						dbop.commit();
 						success = true;
 					}
 				} catch (Exception e) {
-					op.rollback();
+					dbop.rollback();
 					e.printStackTrace();
 		        	log.error("LinkStorageImpl:update {} link:{} failed", dmop, link);
 				}
@@ -70,11 +76,11 @@
 			if (link != null && linkinfo != null) {
 				try {
 					if (setLinkInfoImpl(link, linkinfo)) {
-						op.commit();
+						dbop.commit();
 						success = true;
 					}
 				} catch (Exception e) {
-					op.rollback();
+					dbop.rollback();
 					e.printStackTrace();
 		        	log.error("LinkStorageImpl:update {} link:{} failed", dmop, link);
 				}
@@ -84,15 +90,15 @@
 			if (link != null) {
 				try {
 					if (deleteLinkImpl(link)) {
-						op.commit();
+						dbop.commit();
 						success = true;
 		            	log.debug("LinkStorageImpl:update {} link:{} succeeded", dmop, link);
 		            } else {
-						op.rollback();
+						dbop.rollback();
 		            	log.debug("LinkStorageImpl:update {} link:{} failed", dmop, link);
 					}
 				} catch (Exception e) {
-					op.rollback();
+					dbop.rollback();
 					e.printStackTrace();
 					log.error("LinkStorageImpl:update {} link:{} failed", dmop, link);
 				}
@@ -134,18 +140,18 @@
 				// Set LinkInfo only if linfo is non-null.
 				if (linfo != null && (! setLinkInfoImpl(link, linfo))) {
 					log.debug("Adding linkinfo failed: {}", link);
-					op.rollback();
+					dbop.rollback();
 				}
-				op.commit();
+				dbop.commit();
 				success = true;
 			} else {
 				// If we fail here that's because the ports aren't added
 				// before we try to add the link
 				log.debug("Adding link failed: {}", link);
-				op.rollback();
+				dbop.rollback();
 			}
 		} catch (Exception e) {
-			op.rollback();
+			dbop.rollback();
 			e.printStackTrace();
 			log.error("LinkStorageImpl:addLink link:{} linfo:{} failed", link, linfo);
 		}
@@ -169,10 +175,10 @@
 		}
 		
 		try {
-			op.commit();
+			dbop.commit();
 			success = true;
 		} catch (Exception e) {
-			op.rollback();
+			dbop.rollback();
 			e.printStackTrace();
 			log.error("LinkStorageImpl:addLinks link:s{} failed", links);
 		}
@@ -192,15 +198,15 @@
 		
         try {
          	if (deleteLinkImpl(lt)) {
-        		op.commit();
+        		dbop.commit();
         		success = true;
             	log.debug("LinkStorageImpl:deleteLink(): deleted edges {}", lt);
             } else {
-            	op.rollback();
+            	dbop.rollback();
             	log.error("LinkStorageImpl:deleteLink(): failed invalid vertices {}", lt);
             }
         } catch (Exception e) {
-        	op.rollback();
+        	dbop.rollback();
         	log.error("LinkStorageImpl:deleteLink(): failed {} {}",
         			new Object[]{lt, e.toString()});
         	e.printStackTrace();
@@ -220,14 +226,14 @@
 		try {
 			for (Link lt : links) {
 				if (! deleteLinkImpl(lt)) {
-					op.rollback();
+					dbop.rollback();
 					return false;
 				}
 			}
-			op.commit();
+			dbop.commit();
 			success = true;
 		} catch (Exception e) {
-        	op.rollback();
+        	dbop.rollback();
 			e.printStackTrace();
         	log.error("LinkStorageImpl:deleteLinks failed invalid vertices {}", links);
 		}
@@ -244,8 +250,7 @@
 	@Override
 	public List<Link> getLinks(Long dpid, short port) {
 	    List<Link> links = new ArrayList<Link>();
-
-	    IPortObject srcPort = op.searchPort(HexString.toHexString(dpid), port);
+	    IPortObject srcPort = dbop.searchPort(HexString.toHexString(dpid), port);
 	    if (srcPort == null)
 		return links;
 	    ISwitchObject srcSw = srcPort.getSwitch();
@@ -274,7 +279,7 @@
 	public List<Link> getReverseLinks(Long dpid, short port) {
 	    List<Link> links = new ArrayList<Link>();
     	
-	    IPortObject srcPort = op.searchPort(HexString.toHexString(dpid), port);
+	    IPortObject srcPort = dbop.searchPort(HexString.toHexString(dpid), port);
 	    if (srcPort == null)
 		return links;
 	    ISwitchObject srcSw = srcPort.getSwitch();
@@ -306,15 +311,15 @@
 		try {
 			for(Link l : linksToDelete) {
 				if (! deleteLinkImpl(l)) {
-					op.rollback();
+					dbop.rollback();
 					log.error("LinkStorageImpl:deleteLinksOnPort dpid:{} port:{} failed", dpid, port);
 					return false;
 				}
 			}
-			op.commit();
+			dbop.commit();
 			success = true;
 		} catch (Exception e) {
-        	op.rollback();
+        	dbop.rollback();
 			e.printStackTrace();
         	log.error("LinkStorageImpl:deleteLinksOnPort dpid:{} port:{} failed", dpid, port);
 		}
@@ -330,8 +335,7 @@
 	@Override
 	public List<Link> getLinks(String dpid) {
 		List<Link> links = new ArrayList<Link>();
-
-		ISwitchObject srcSw = op.searchSwitch(dpid);
+		ISwitchObject srcSw = dbop.searchSwitch(dpid);
 		
 		if(srcSw != null) {
 			for(IPortObject srcPort : srcSw.getPorts()) {
@@ -361,7 +365,7 @@
 	public List<Link> getReverseLinks(String dpid) {
 		List<Link> links = new ArrayList<Link>();
 
-		ISwitchObject srcSw = op.searchSwitch(dpid);
+		ISwitchObject srcSw = dbop.searchSwitch(dpid);
 		
 		if(srcSw != null) {
 			for(IPortObject srcPort : srcSw.getPorts()) {
@@ -388,7 +392,7 @@
 	 * @return List of active links. Empty list if no port was found.
 	 */
 	public List<Link> getActiveLinks() {
-		Iterable<ISwitchObject> switches = op.getActiveSwitches();
+		Iterable<ISwitchObject> switches = dbop.getActiveSwitches();
 
 		List<Link> links = new ArrayList<Link>(); 
 		
@@ -451,17 +455,22 @@
 		// get source port vertex
 		String dpid = HexString.toHexString(lt.getSrc());
 		short port = lt.getSrcPort();
-		vportSrc = op.searchPort(dpid, port);
+		log.debug("addLinkImpl Src dpid : " + dpid + " port :" + port);
+		vportSrc = dbop.searchPort(dpid, port);
 		
 		// get dest port vertex
 		dpid = HexString.toHexString(lt.getDst());
 		port = lt.getDstPort();
-		vportDst = op.searchPort(dpid, port);
-		            
+		log.debug("addLinkImpl Dst dpid : " + dpid + " port :" + port);
+		vportDst = dbop.searchPort(dpid, port);
+		
+		log.debug("addLinkImpl vportSrc : " + vportSrc + " vportDst : " + vportDst);
+		
 		if (vportSrc != null && vportDst != null) {
 			IPortObject portExist = null;
 			// check if the link exists
 			for (IPortObject V : vportSrc.getLinkedPorts()) {
+			        log.debug("vportSrc.getLinkedPorts() :" + V);
 				if (V.equals(vportDst)) {
 					portExist = V;
 					break;
@@ -473,7 +482,7 @@
 				success = true;
 			} else {
 				log.debug("LinkStorageImpl:addLinkImpl failed link exists {} {} src {} dst {}", 
-						new Object[]{op, lt, vportSrc, vportDst});
+						new Object[]{dbop, lt, vportSrc, vportDst});
 			}
 		}
 		
@@ -487,12 +496,12 @@
 	    // get source port vertex
 	 	String dpid = HexString.toHexString(lt.getSrc());
 	 	short port = lt.getSrcPort();
-	 	vportSrc = op.searchPort(dpid, port);
+	 	vportSrc = dbop.searchPort(dpid, port);
 	    
 	    // get dst port vertex
 	 	dpid = HexString.toHexString(lt.getDst());
 	 	port = lt.getDstPort();
-	 	vportDst = op.searchPort(dpid, port);
+	 	vportDst = dbop.searchPort(dpid, port);
 	 	
 		// FIXME: This needs to remove all edges
 	 	if (vportSrc != null && vportDst != null) {
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 a92ab72..cb535b2 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
@@ -4,8 +4,9 @@
 import java.util.List;
 
 import net.floodlightcontroller.core.IOFSwitch;
-import net.onrc.onos.graph.GraphDBConnection;
-import net.onrc.onos.graph.GraphDBOperation;
+import net.onrc.onos.graph.DBOperation;
+import net.onrc.onos.graph.GraphDBManager;
+import net.onrc.onos.ofcontroller.core.ISwitchStorage;
 import net.onrc.onos.ofcontroller.core.INetMapTopologyObjects.IDeviceObject;
 import net.onrc.onos.ofcontroller.core.INetMapTopologyObjects.IPortObject;
 import net.onrc.onos.ofcontroller.core.INetMapTopologyObjects.ISwitchObject;
@@ -21,7 +22,8 @@
  * This is the class for storing the information of switches into GraphDB
  */
 public class SwitchStorageImpl implements ISwitchStorage {
-	protected GraphDBOperation op;
+
+	protected DBOperation op;
 	protected final static Logger log = LoggerFactory.getLogger(SwitchStorageImpl.class);
 
 	/***
@@ -29,11 +31,12 @@
 	 * @param conf configuration file for Cassandra DB
 	 */
 	@Override
-	public void init(String conf) {
-		GraphDBConnection conn = GraphDBConnection.getInstance(conf);
-		op = new GraphDBOperation(conn);
+	public void init(final String dbStore, final String conf) {
+		op = GraphDBManager.getDBOperation("ramcloud", "/tmp/ramcloudconf");
+		//op = GraphDBManager.getDBOperation(dbStore, conf);
 	}
 
+
 	/***
 	 * Finalize/close function. After you use this class, please call this method.
 	 * It will close the DB connection.
@@ -156,7 +159,7 @@
 			// XXX for now delete devices when we change a port to prevent
 			// having stale devices.
 			DeviceStorageImpl deviceStorage = new DeviceStorageImpl();
-			deviceStorage.init("");
+			deviceStorage.init("","");
 			for (IPortObject portObject : curr.getPorts()) {
 				for (IDeviceObject deviceObject : portObject.getDevices()) {
 					// The deviceStorage has to remove on the object gained by its own
@@ -312,7 +315,7 @@
 	        	// XXX for now delete devices when we change a port to prevent
 	    		// having stale devices.
 	    		DeviceStorageImpl deviceStorage = new DeviceStorageImpl();
-	    		deviceStorage.init("");
+	    		deviceStorage.init("","");
 
 	    		for (IDeviceObject deviceObject : portObject.getDevices()) {
 	    			deviceStorage.removeDevice(deviceObject);
@@ -342,7 +345,7 @@
 		boolean success = false;
 
 		DeviceStorageImpl deviceStorage = new DeviceStorageImpl();
-		deviceStorage.init("");
+		deviceStorage.init("","");
 
 		try {
 			ISwitchObject sw = op.searchSwitch(dpid);
@@ -494,4 +497,4 @@
 	    			new Object[] {port.getPortId(), state, desc});
 		}
 	}
-}
\ No newline at end of file
+}
diff --git a/src/main/java/net/onrc/onos/ofcontroller/core/internal/TopoLinkServiceImpl.java b/src/main/java/net/onrc/onos/ofcontroller/core/internal/TopoLinkServiceImpl.java
index 71fecd0..cf73c9c 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/core/internal/TopoLinkServiceImpl.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/core/internal/TopoLinkServiceImpl.java
@@ -4,7 +4,7 @@
 import java.util.List;
 
 import net.floodlightcontroller.routing.Link;
-import net.onrc.onos.graph.GraphDBOperation;
+import net.onrc.onos.graph.DBOperation;
 import net.onrc.onos.ofcontroller.core.INetMapTopologyObjects.ISwitchObject;
 import net.onrc.onos.ofcontroller.core.INetMapTopologyService.ITopoLinkService;
 
@@ -14,12 +14,13 @@
 
 import com.tinkerpop.blueprints.Vertex;
 import com.tinkerpop.gremlin.java.GremlinPipeline;
+import net.onrc.onos.graph.GraphDBManager;
 import com.tinkerpop.pipes.PipeFunction;
 import com.tinkerpop.pipes.transform.PathPipe;
 
 public class TopoLinkServiceImpl implements ITopoLinkService {
 	
-	protected GraphDBOperation op;
+	protected DBOperation dbop;
 	protected final static Logger log = LoggerFactory.getLogger(TopoLinkServiceImpl.class);
 
 	public void finalize() {
@@ -28,14 +29,16 @@
 	
 	@Override
 	public void close() {
-		op.close();
+		dbop.close();
 	}
  
 	@Override
 	public List<Link> getActiveLinks() {
-		op = new GraphDBOperation("");
-		op.commit(); //Commit to ensure we see latest data
-		Iterable<ISwitchObject> switches = op.getActiveSwitches();
+		// TODO Auto-generated method stub
+		dbop = GraphDBManager.getDBOperation("ramcloud", "/tmp/ramcloudconf");
+		//dbop = GraphDBManager.getDBOperation("", "");
+		//dbop.commit(); //Commit to ensure we see latest data
+		Iterable<ISwitchObject> switches = dbop.getActiveSwitches();
 		List<Link> links = new ArrayList<Link>(); 
 		for (ISwitchObject sw : switches) {
 			GremlinPipeline<Vertex, Link> pipe = new GremlinPipeline<Vertex, Link>();
@@ -51,14 +54,14 @@
 			}
 						
 		}
-		op.commit();
+		dbop.commit();
 		return links;
 	}
 
 	@Override
 	public List<Link> getLinksOnSwitch(String dpid) {
 		List<Link> links = new ArrayList<Link>(); 
-		ISwitchObject sw = op.searchSwitch(dpid);
+		ISwitchObject sw = dbop.searchSwitch(dpid);
 		GremlinPipeline<Vertex, Link> pipe = new GremlinPipeline<Vertex, Link>();
 		ExtractLink extractor = new ExtractLink();
 
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 3a324b1..3f7090b 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
@@ -1,6 +1,7 @@
 package net.onrc.onos.ofcontroller.core.internal;
 
-import net.onrc.onos.graph.GraphDBOperation;
+import net.onrc.onos.graph.DBOperation;
+import net.onrc.onos.graph.GraphDBManager;
 import net.onrc.onos.ofcontroller.core.INetMapTopologyObjects.IPortObject;
 import net.onrc.onos.ofcontroller.core.INetMapTopologyObjects.ISwitchObject;
 import net.onrc.onos.ofcontroller.core.INetMapTopologyService.ITopoSwitchService;
@@ -10,15 +11,16 @@
 
 public class TopoSwitchServiceImpl implements ITopoSwitchService {
 	
-	private GraphDBOperation op;
+	private DBOperation op;
 	protected final static Logger log = LoggerFactory.getLogger(TopoSwitchServiceImpl.class);
 
-	public TopoSwitchServiceImpl(String conf) {
-		op = new GraphDBOperation(conf);
+	public TopoSwitchServiceImpl(final String dbStore, String conf) {
+		op = GraphDBManager.getDBOperation("ramcloud", "/tmp/ramcloudconf");
+		//op = GraphDBManager.getDBOperation(dbStore, conf);;
 	}
 
 	public TopoSwitchServiceImpl() {
-		this("");
+		this("","");
 	}
 	
 	public void finalize() {
@@ -33,27 +35,27 @@
 	@Override
 	public Iterable<ISwitchObject> getActiveSwitches() {
 		// TODO Auto-generated method stub
-		op.close(); //Commit to ensure we see latest data
+		//op.close(); //Commit to ensure we see latest data
 		return op.getActiveSwitches();
 	}
 
 	@Override
 	public Iterable<ISwitchObject> getAllSwitches() {
 		// TODO Auto-generated method stub
-		op.close(); //Commit to ensure we see latest data
+		//op.close(); //Commit to ensure we see latest data
 		return op.getAllSwitches();
 	}
 
 	@Override
 	public Iterable<ISwitchObject> getInactiveSwitches() {
 		// TODO Auto-generated method stub
-		op.close(); //Commit to ensure we see latest data
+		//op.close(); //Commit to ensure we see latest data
 		return op.getInactiveSwitches();
 	}
 
 	@Override
 	public Iterable<IPortObject> getPortsOnSwitch(String dpid) {
-		op.close(); //Commit to ensure we see latest data
+		//op.close(); //Commit to ensure we see latest data
 		ISwitchObject switchObject = op.searchSwitch(dpid);
 		if (switchObject != null) {
 			return switchObject.getPorts();
diff --git a/src/main/java/net/onrc/onos/ofcontroller/floodlightlistener/NetworkGraphPublisher.java b/src/main/java/net/onrc/onos/ofcontroller/floodlightlistener/NetworkGraphPublisher.java
index d777202..3337cf8 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/floodlightlistener/NetworkGraphPublisher.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/floodlightlistener/NetworkGraphPublisher.java
@@ -20,9 +20,10 @@
 import net.floodlightcontroller.devicemanager.IDeviceListener;
 import net.floodlightcontroller.routing.Link;
 import net.floodlightcontroller.threadpool.IThreadPoolService;
+import net.onrc.onos.graph.DBOperation;
+import net.onrc.onos.graph.DBConnection;
+import net.onrc.onos.graph.GraphDBManager;
 import net.onrc.onos.datagrid.IDatagridService;
-import net.onrc.onos.graph.GraphDBConnection;
-import net.onrc.onos.graph.GraphDBOperation;
 import net.onrc.onos.graph.IDBConnection;
 import net.onrc.onos.graph.LocalTopologyEventListener;
 import net.onrc.onos.ofcontroller.core.IDeviceStorage;
@@ -63,9 +64,10 @@
 	protected final static Logger log = LoggerFactory.getLogger(NetworkGraphPublisher.class);
 	//protected IDeviceService deviceService;
 	protected IControllerRegistryService registryService;
-	protected GraphDBOperation op;
+	protected DBOperation op;
 	
 	protected static final String DBConfigFile = "dbconf";
+        protected static final String GraphDBStore = "graph_db_store";
 	protected static final String CleanupEnabled = "EnableCleanup";
 	protected IThreadPoolService threadPool;
 	protected IFloodlightProviderService floodlightProvider;
@@ -84,6 +86,7 @@
         public void run() {
             try {
             	log.debug("Running cleanup thread");
+		op = GraphDBManager.getDBOperation("ramcloud", "/tmp/ramcloudconf");
                 switchCleanup();
             }
             catch (Exception e) {
@@ -146,7 +149,7 @@
     }
 
     protected void switchCleanup() {
-    	op.close();
+    	//op.close();
     	Iterable<ISwitchObject> switches = op.getActiveSwitches();
     	
     	log.debug("Checking for inactive switches");
@@ -442,7 +445,13 @@
 			throws FloodlightModuleException {
 		Map<String, String> configMap = context.getConfigParams(this);
 		String conf = configMap.get(DBConfigFile);
-		op = new GraphDBOperation(conf);
+                String dbStore = configMap.get(GraphDBStore);
+		System.out.println("conf" + conf + "dbStore" + dbStore);
+		op = GraphDBManager.getDBOperation("ramcloud", "/tmp/ramcloudconf");
+		//op = GraphDBManager.getDBOperation(dbStore, conf);
+		if (op == null) {
+		    System.out.println("publisher op is null");
+		}
 		
 		floodlightProvider =
 	            context.getServiceImpl(IFloodlightProviderService.class);
@@ -453,13 +462,13 @@
 		datagridService = context.getServiceImpl(IDatagridService.class);
 		
 		devStore = new DeviceStorageImpl();
-		devStore.init(conf);
+		devStore.init(dbStore, conf);
 		
 		swStore = new SwitchStorageImpl();
-		swStore.init(conf);
+		swStore.init(dbStore, conf);
 		
 		linkStore = new LinkStorageImpl();
-		linkStore.init(conf);
+		linkStore.init(dbStore, conf);
 				
 		log.debug("Initializing NetworkGraphPublisher module with {}", conf);
 		
@@ -475,8 +484,9 @@
 		linkDiscovery.addListener(this);
 		
 		log.debug("Adding EventListener");
+		System.out.println("start Up op " + op);
 		IDBConnection conn = op.getDBConnection();
-		conn.addEventListener(new LocalTopologyEventListener((GraphDBConnection) conn));
+		conn.addEventListener(new LocalTopologyEventListener((DBConnection) conn));
 	       // Setup the Cleanup task. 
 		if (cleanupNeeded == null || !cleanupNeeded.equals("False")) {
 				ScheduledExecutorService ses = threadPool.getScheduledExecutor();
diff --git a/src/main/java/net/onrc/onos/ofcontroller/flowmanager/FlowDatabaseOperation.java b/src/main/java/net/onrc/onos/ofcontroller/flowmanager/FlowDatabaseOperation.java
index 9969cfc..194922b 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/flowmanager/FlowDatabaseOperation.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/flowmanager/FlowDatabaseOperation.java
@@ -7,8 +7,7 @@
 import java.util.List;
 
 import net.floodlightcontroller.util.MACAddress;
-
-import net.onrc.onos.graph.GraphDBOperation;
+import net.onrc.onos.graph.DBOperation;
 
 import net.onrc.onos.ofcontroller.core.INetMapTopologyObjects.IFlowEntry;
 import net.onrc.onos.ofcontroller.core.INetMapTopologyObjects.IFlowPath;
@@ -32,11 +31,12 @@
      * @param flowPath the Flow Path to install.
      * @return true on success, otherwise false.
      */
-    static boolean addFlow(GraphDBOperation dbHandler, FlowPath flowPath) {
+    static boolean addFlow(DBOperation dbHandler, FlowPath flowPath) {
 	IFlowPath flowObj = null;
 	boolean found = false;
 	try {
-	    if ((flowObj = dbHandler.searchFlowPath(flowPath.flowId())) != null) {
+	    flowObj = dbHandler.searchFlowPath(flowPath.flowId());
+	    if (flowObj != null) {
 		found = true;
 	    } else {
 		flowObj = dbHandler.newFlowPath();
@@ -188,7 +188,7 @@
      * @param flowEntry the Flow Entry to install.
      * @return the added Flow Entry object on success, otherwise null.
      */
-    static IFlowEntry addFlowEntry(GraphDBOperation dbHandler,
+    static IFlowEntry addFlowEntry(DBOperation dbHandler,
 				   IFlowPath flowObj,
 				   FlowEntry flowEntry) {
 	// Flow edges
@@ -336,7 +336,7 @@
      * @param flowEntry the Flow Entry to delete.
      * @return true on success, otherwise false.
      */
-    static boolean deleteFlowEntry(GraphDBOperation dbHandler,
+    static boolean deleteFlowEntry(DBOperation dbHandler,
 				   IFlowPath flowObj,
 				   FlowEntry flowEntry) {
 	IFlowEntry flowEntryObj = null;
@@ -372,7 +372,7 @@
      * @param dbHandler the Graph Database handler to use.
      * @return true on success, otherwise false.
      */
-    static boolean deleteAllFlows(GraphDBOperation dbHandler) {
+    static boolean deleteAllFlows(DBOperation dbHandler) {
 	List<FlowId> allFlowIds = new LinkedList<FlowId>();
 
 	// Get all Flow IDs
@@ -402,7 +402,7 @@
      * @param flowId the Flow ID of the flow to delete.
      * @return true on success, otherwise false.
      */
-    static boolean deleteFlow(GraphDBOperation dbHandler, FlowId flowId) {
+    static boolean deleteFlow(DBOperation dbHandler, FlowId flowId) {
 	IFlowPath flowObj = null;
 	try {
 	    flowObj = dbHandler.searchFlowPath(flowId);
@@ -439,7 +439,7 @@
      * @param flowId the Flow ID of the flow to get.
      * @return the Flow Path if found, otherwise null.
      */
-    static FlowPath getFlow(GraphDBOperation dbHandler, FlowId flowId) {
+    static FlowPath getFlow(DBOperation dbHandler, FlowId flowId) {
 	IFlowPath flowObj = null;
 	try {
 	    flowObj = dbHandler.searchFlowPath(flowId);
@@ -469,7 +469,7 @@
      * @param dbHandler the Graph Database handler to use.
      * @return the Flow Paths if found, otherwise null.
      */
-    static ArrayList<FlowPath> getAllFlows(GraphDBOperation dbHandler) {
+    static ArrayList<FlowPath> getAllFlows(DBOperation dbHandler) {
 	Iterable<IFlowPath> flowPathsObj = null;
 	ArrayList<FlowPath> flowPaths = new ArrayList<FlowPath>();
 
diff --git a/src/main/java/net/onrc/onos/ofcontroller/flowmanager/FlowManager.java b/src/main/java/net/onrc/onos/ofcontroller/flowmanager/FlowManager.java
index bacfd5d..aa227a1 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/flowmanager/FlowManager.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/flowmanager/FlowManager.java
@@ -18,8 +18,10 @@
 import net.floodlightcontroller.core.module.IFloodlightModule;
 import net.floodlightcontroller.core.module.IFloodlightService;
 import net.floodlightcontroller.restserver.IRestApiService;
+import net.floodlightcontroller.util.OFMessageDamper;
+import net.onrc.onos.graph.DBOperation;
+import net.onrc.onos.graph.GraphDBManager;
 import net.onrc.onos.datagrid.IDatagridService;
-import net.onrc.onos.graph.GraphDBOperation;
 import net.onrc.onos.ofcontroller.core.INetMapStorage;
 import net.onrc.onos.ofcontroller.floodlightlistener.INetworkGraphService;
 import net.onrc.onos.ofcontroller.flowmanager.web.FlowWebRoutable;
@@ -48,8 +50,10 @@
  * Flow Manager class for handling the network flows.
  */
 public class FlowManager implements IFloodlightModule, IFlowService, INetMapStorage {
-    protected GraphDBOperation dbHandlerApi;
-    protected GraphDBOperation dbHandlerInner;
+    // flag to use FlowPusher instead of FlowSwitchOperation/MessageDamper
+    private final static boolean enableFlowPusher = false;
+    protected DBOperation dbHandlerApi;
+    protected DBOperation dbHandlerInner;
 
     protected volatile IFloodlightProviderService floodlightProvider;
     protected volatile IDatagridService datagridService;
@@ -81,9 +85,13 @@
      * @param conf the Graph Database configuration string.
      */
     @Override
-    public void init(String conf) {
-    	dbHandlerApi = new GraphDBOperation(conf);
-    	dbHandlerInner = new GraphDBOperation(conf);
+    public void init(final String dbStore, final String conf) {
+	dbHandlerApi = GraphDBManager.getDBOperation("ramcloud", "/tmp/ramcloudconf");
+	dbHandlerInner = GraphDBManager.getDBOperation("ramcloud", "/tmp/ramcloudconf");
+
+	//dbHandlerApi = GraphDBManager.getDBOperation(dbStore, conf);
+	//dbHandlerInner = GraphDBManager.getDBOperation(dbStore, conf);
+	
     }
 
     /**
@@ -171,7 +179,7 @@
 	pusher = context.getServiceImpl(IFlowPusherService.class);
 	forwardingService = context.getServiceImpl(IForwardingService.class);
 
-	this.init("");
+	this.init("","");
     }
 
     /**
diff --git a/src/main/java/net/onrc/onos/ofcontroller/flowprogrammer/FlowSynchronizer.java b/src/main/java/net/onrc/onos/ofcontroller/flowprogrammer/FlowSynchronizer.java
index 6ef44be..04d3bbc 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/flowprogrammer/FlowSynchronizer.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/flowprogrammer/FlowSynchronizer.java
@@ -24,7 +24,8 @@
 import org.slf4j.LoggerFactory;
 
 import net.floodlightcontroller.core.IOFSwitch;
-import net.onrc.onos.graph.GraphDBOperation;
+import net.onrc.onos.graph.DBOperation;
+import net.onrc.onos.graph.GraphDBManager;
 import net.onrc.onos.ofcontroller.core.INetMapTopologyObjects.IFlowEntry;
 import net.onrc.onos.ofcontroller.core.INetMapTopologyObjects.ISwitchObject;
 import net.onrc.onos.ofcontroller.flowmanager.FlowDatabaseOperation;
@@ -44,14 +45,13 @@
 
     private static Logger log = LoggerFactory.getLogger(FlowSynchronizer.class);
 
-    private GraphDBOperation dbHandler;
+    private DBOperation dbHandler;
     protected IFlowPusherService pusher;
     private Map<IOFSwitch, FutureTask<SyncResult>> switchThreads; 
 
     public FlowSynchronizer() {
-	dbHandler = new GraphDBOperation("");
-	switchThreads = new HashMap<IOFSwitch, FutureTask<SyncResult>>();
-    }
+	dbHandler = GraphDBManager.getDBOperation("ramcloud", "/tmp/ramcloudconf");
+	switchThreads = new HashMap<IOFSwitch, FutureTask<SyncResult>>();    }
 
     @Override
     public Future<SyncResult> synchronize(IOFSwitch sw) {
diff --git a/src/main/java/net/onrc/onos/ofcontroller/forwarding/Forwarding.java b/src/main/java/net/onrc/onos/ofcontroller/forwarding/Forwarding.java
index 4415120..65bc40b 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/forwarding/Forwarding.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/forwarding/Forwarding.java
@@ -196,9 +196,9 @@
 		waitingPackets = LinkedListMultimap.create();
 		
 		deviceStorage = new DeviceStorageImpl();
-		deviceStorage.init("");
+		deviceStorage.init("","");
 		topologyService = new TopologyManager();
-		topologyService.init("");
+		topologyService.init("","");
 	}
 	
 	@Override
diff --git a/src/main/java/net/onrc/onos/ofcontroller/proxyarp/BgpProxyArpManager.java b/src/main/java/net/onrc/onos/ofcontroller/proxyarp/BgpProxyArpManager.java
index 801e414..3dba4f8 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/proxyarp/BgpProxyArpManager.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/proxyarp/BgpProxyArpManager.java
@@ -143,7 +143,7 @@
 		floodlightProvider.addOFMessageListener(OFType.PACKET_IN, this);
 		
 		deviceStorage = new DeviceStorageImpl();
-		deviceStorage.init("");
+		deviceStorage.init("","");
 		
 		Timer arpTimer = new Timer("arp-processing");
 		arpTimer.scheduleAtFixedRate(new TimerTask() {
diff --git a/src/main/java/net/onrc/onos/ofcontroller/proxyarp/ProxyArpManager.java b/src/main/java/net/onrc/onos/ofcontroller/proxyarp/ProxyArpManager.java
index 32b2e9c..9d9e36d 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/proxyarp/ProxyArpManager.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/proxyarp/ProxyArpManager.java
@@ -184,7 +184,7 @@
 		datagrid.registerArpEventHandler(this);
 		
 		deviceStorage = new DeviceStorageImpl();
-		deviceStorage.init("");
+		deviceStorage.init("","");
 		
 		Timer arpTimer = new Timer("arp-processing");
 		arpTimer.scheduleAtFixedRate(new TimerTask() {
diff --git a/src/main/java/net/onrc/onos/ofcontroller/topology/ShortestPath.java b/src/main/java/net/onrc/onos/ofcontroller/topology/ShortestPath.java
index 9a8345c..d9e1314 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/topology/ShortestPath.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/topology/ShortestPath.java
@@ -9,7 +9,7 @@
 import java.util.Queue;
 import java.util.Set;
 
-import net.onrc.onos.graph.GraphDBOperation;
+import net.onrc.onos.graph.DBOperation;
 import net.onrc.onos.ofcontroller.core.INetMapTopologyObjects.ISwitchObject;
 import net.onrc.onos.ofcontroller.core.ISwitchStorage.SwitchState;
 import net.onrc.onos.ofcontroller.util.DataPath;
@@ -163,7 +163,7 @@
      * @return the data path with the computed shortest path if
      * found, otherwise null.
      */
-    public static DataPath getDatabaseShortestPath(GraphDBOperation dbHandler,
+    public static DataPath getDatabaseShortestPath(DBOperation dbHandler,
 					     SwitchPort src, SwitchPort dest) {
 	DataPath result_data_path = new DataPath();
 
@@ -326,4 +326,4 @@
 
 	return null;
     }
-}
\ No newline at end of file
+}
diff --git a/src/main/java/net/onrc/onos/ofcontroller/topology/Topology.java b/src/main/java/net/onrc/onos/ofcontroller/topology/Topology.java
index fc75591..761189c 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/topology/Topology.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/topology/Topology.java
@@ -13,6 +13,7 @@
 
 import com.tinkerpop.blueprints.Direction;
 import com.tinkerpop.blueprints.Vertex;
+import net.onrc.onos.graph.DBOperation;
 
 /**
  * A class for storing Node and Link information for fast computation
@@ -382,7 +383,7 @@
      *
      * @param dbHandler the Graph Database handler to use.
      */
-    public void readFromDatabase(GraphDBOperation dbHandler) {
+    public void readFromDatabase(DBOperation dbHandler) {
 	//
 	// Fetch the relevant info from the Switch and Port vertices
 	// from the Titan Graph.
diff --git a/src/main/java/net/onrc/onos/ofcontroller/topology/TopologyManager.java b/src/main/java/net/onrc/onos/ofcontroller/topology/TopologyManager.java
index be207c6..570e94f 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/topology/TopologyManager.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/topology/TopologyManager.java
@@ -12,6 +12,8 @@
 import net.floodlightcontroller.core.module.IFloodlightService;
 import net.floodlightcontroller.restserver.IRestApiService;
 import net.onrc.onos.datagrid.IDatagridService;
+import net.onrc.onos.graph.DBOperation;
+import net.onrc.onos.graph.GraphDBManager;
 import net.onrc.onos.graph.GraphDBOperation;
 import net.onrc.onos.ofcontroller.floodlightlistener.INetworkGraphService;
 import net.onrc.onos.ofcontroller.topology.web.OnosTopologyWebRoutable;
@@ -35,7 +37,10 @@
     private final static Logger log = LoggerFactory.getLogger(TopologyManager.class);
     protected IFloodlightProviderService floodlightProvider;
 
-    protected GraphDBOperation dbHandler;
+    protected static final String DBConfigFile = "dbconf";
+    protected static final String GraphDBStore = "graph_db_store";
+
+    protected DBOperation dbHandler;
     protected IRestApiService restApi;
 
 
@@ -51,8 +56,11 @@
      * @param config the database configuration file to use for
      * the initialization.
      */
-    public TopologyManager(String config) {
-	this.init(config);
+    public TopologyManager(FloodlightModuleContext context) {
+	Map<String, String> configMap = context.getConfigParams(this);
+	String conf = configMap.get(DBConfigFile);
+        String dbStore = configMap.get(GraphDBStore);
+	this.init(dbStore,conf);
     }
 
     /**
@@ -61,19 +69,20 @@
      * @param dbHandler the database operation handler to use for the
      * initialization.
      */
-    public TopologyManager(GraphDBOperation dbHandler) {
+    public TopologyManager(DBOperation dbHandler) {
 	this.dbHandler = dbHandler;
     }
 
     /**
      * Init the module.
-     *
+     * @param 
      * @param config the database configuration file to use for
      * the initialization.
      */
-    public void init(String config) {
+    public void init(final String dbStore, String config) {
 	try {
-	    dbHandler = new GraphDBOperation(config);
+	    dbHandler = GraphDBManager.getDBOperation("ramcloud", "/tmp/ramcloudconf");
+	    //dbHandler = GraphDBManager.getDBOperation(dbStore, config);
 	} catch (Exception e) {
 	    log.error(e.getMessage());
 	}
@@ -148,9 +157,10 @@
 	throws FloodlightModuleException {
 	floodlightProvider = context.getServiceImpl(IFloodlightProviderService.class);
 	restApi = context.getServiceImpl(IRestApiService.class);
-
-	String conf = "";
-	this.init(conf);
+	Map<String, String> configMap = context.getConfigParams(this);
+	String conf = configMap.get(DBConfigFile);
+        String dbStore = configMap.get(GraphDBStore);
+	this.init(dbStore, conf);
     }
 
     /**
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
index 8034d44..69c3c8a 100644
--- a/src/test/java/net/onrc/onos/ofcontroller/core/internal/LinkStorageImplTest.java
+++ b/src/test/java/net/onrc/onos/ofcontroller/core/internal/LinkStorageImplTest.java
@@ -119,7 +119,7 @@
 		mockToPortInfoMap = new HashMap<IPortObject,PortInfo>();
 		
 		linkStorage = new LinkStorageImpl();
-		linkStorage.init("/dummy/path/to/conf");
+		linkStorage.init("dummyStore", "/dummy/path/to/conf");
 		
 		initLinks();
 	}
diff --git a/src/test/java/net/onrc/onos/ofcontroller/core/internal/SwitchStorageImplTest.java b/src/test/java/net/onrc/onos/ofcontroller/core/internal/SwitchStorageImplTest.java
index 6f4f850..fdc13db 100644
--- a/src/test/java/net/onrc/onos/ofcontroller/core/internal/SwitchStorageImplTest.java
+++ b/src/test/java/net/onrc/onos/ofcontroller/core/internal/SwitchStorageImplTest.java
@@ -34,6 +34,7 @@
 	protected static org.slf4j.Logger log = LoggerFactory.getLogger(SwitchStorageImpl.class);
 
 	String conf;
+        String dbStore;
     private GraphDBConnection mockConn = null;
     private GraphDBOperation mockOpe = null;
     ISwitchStorage swSt = null;
@@ -42,6 +43,7 @@
 	public void setUp() throws Exception {
 		
 		swSt = new SwitchStorageImpl();
+                dbStore = "dummyStore";
 		conf = "/dummy/path/to/db";
 		
         // Make mock cassandra DB
@@ -95,7 +97,7 @@
 		mockOpe.close();
 		replay(mockOpe);
 		
-		swSt.init(conf);
+		swSt.init(dbStore, conf);
 		swSt.addSwitch(dpid);
 	}
 	
@@ -129,7 +131,7 @@
 		mockOpe.close();
 		replay(mockOpe);
 		
-		swSt.init(conf);
+		swSt.init(dbStore, conf);
 		swSt.addSwitch(dpid);
 		swSt.addSwitch(dpid);
 	}
@@ -153,7 +155,7 @@
 		mockOpe.close();
 		replay(mockOpe);
 		
-		swSt.init(conf);
+		swSt.init(dbStore, conf);
 		swSt.addSwitch(dpid);
 	}
 	
@@ -185,7 +187,7 @@
 		mockOpe.close();
 		replay(mockOpe);
 		
-		swSt.init(conf);
+		swSt.init(dbStore, conf);
 		swSt.addSwitch(dpid);
 	}
 	
@@ -217,7 +219,7 @@
 		mockOpe.close();
 		replay(mockOpe);
 		
-		swSt.init(conf);
+		swSt.init(dbStore, conf);
 		swSt.updateSwitch(dpid, stateINACTIVE, opUPDATE);
 	}
 	
@@ -250,7 +252,7 @@
 		mockOpe.close();
 		replay(mockOpe);
 		
-		swSt.init(conf);
+		swSt.init(dbStore, conf);
 		swSt.updateSwitch(dpid, stateINACTIVE, opCREATE);
 	}
 	
@@ -283,7 +285,7 @@
 		mockOpe.close();
 		replay(mockOpe);
 		
-		swSt.init(conf);
+		swSt.init(dbStore, conf);
 		swSt.updateSwitch(dpid, stateINACTIVE, opINSERT);
 	}
 	
@@ -319,7 +321,7 @@
 		mockOpe.close();
 		replay(mockOpe);
 		
-		swSt.init(conf);
+		swSt.init(dbStore, conf);
 		swSt.addSwitch(dpid);
 		swSt.updateSwitch(dpid, stateACTIVE, opDELETE);
 	}
@@ -354,7 +356,7 @@
 		mockOpe.close();
 		replay(mockOpe);
 		
-		swSt.init(conf);
+		swSt.init(dbStore, conf);
 		swSt.addSwitch(dpid);
 		swSt.deleteSwitch(dpid);
 		
@@ -393,7 +395,7 @@
 		mockOpe.close();
 		replay(mockOpe);
 		
-		swSt.init(conf);
+		swSt.init(dbStore, conf);
 		swSt.addSwitch(dpid);
 		swSt.deleteSwitch(dpid);
 	}
@@ -446,7 +448,7 @@
 		mockOpe.close();
 		replay(mockOpe);
 
-		swSt.init(conf);
+		swSt.init(dbStore, conf);
 		swSt.addSwitch(dpid);
 		swSt.addPort(dpid, portToAdd);
 	}
@@ -502,7 +504,7 @@
 		mockOpe.close();
 		replay(mockOpe);
 
-		swSt.init(conf);
+		swSt.init(dbStore, conf);
 		swSt.addSwitch(dpid);
 		swSt.addPort(dpid, portToAdd);
 	}
@@ -541,7 +543,7 @@
 		mockOpe.close();
 		replay(mockOpe);
 
-		swSt.init(conf);
+		swSt.init(dbStore, conf);
 		swSt.addPort(dpid, portToAdd);
 	}
 	
@@ -593,7 +595,7 @@
 		mockOpe.close();
 		replay(mockOpe);
 
-		swSt.init(conf);
+		swSt.init(dbStore, conf);
 		swSt.addSwitch(dpid);
 		swSt.addPort(dpid, portToAdd);
 	}
@@ -648,7 +650,7 @@
 		mockOpe.close();
 		replay(mockOpe);
 
-		swSt.init(conf);
+		swSt.init(dbStore, conf);
 		swSt.addSwitch(dpid);
 		swSt.addPort(dpid, portToAdd);
 	}
@@ -711,7 +713,7 @@
 		mockOpe.close();
 		replay(mockOpe);
 
-		swSt.init(conf);
+		swSt.init(dbStore, conf);
 		swSt.addSwitch(dpid);
 		swSt.addPort(dpid, portToAdd);
 		swSt.deletePort(dpid, portNumber);
@@ -778,7 +780,7 @@
 		mockOpe.close();
 		replay(mockOpe);
 	
-		swSt.init(conf);
+		swSt.init(dbStore, conf);
 		swSt.addSwitch(dpid);
 		swSt.addPort(dpid, portToAdd);
 		swSt.deletePort(dpid, portNumber);
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 7edc1c5..fe51f95 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
@@ -49,6 +49,7 @@
 	protected static org.slf4j.Logger log = LoggerFactory.getLogger(SwitchStorageImpl.class);
 
 	String conf;
+        String dbStore;
     private GraphDBConnection conn = null;
     private GraphDBOperation ope = null;
     private TitanGraph titanGraph = null;
@@ -59,6 +60,7 @@
 		
 		swSt = new SwitchStorageImpl();
 		conf = "/dummy/path/to/db";
+                dbStore ="dummyStore";
 		
 		// Make mock cassandra DB
 		// Replace TitanFactory.open() to return mock DB
@@ -71,7 +73,7 @@
 		conn = GraphDBConnection.getInstance(conf);
 		ope = new GraphDBOperation(conn);
 		
-		swSt.init(conf);
+		swSt.init(dbStore, conf);
 	}
 
 	@After
diff --git a/src/test/java/net/onrc/onos/ofcontroller/core/internal/TestableLinkStorageImpl.java b/src/test/java/net/onrc/onos/ofcontroller/core/internal/TestableLinkStorageImpl.java
index ecba546..8411b22 100644
--- a/src/test/java/net/onrc/onos/ofcontroller/core/internal/TestableLinkStorageImpl.java
+++ b/src/test/java/net/onrc/onos/ofcontroller/core/internal/TestableLinkStorageImpl.java
@@ -2,7 +2,6 @@
 
 import java.util.Set;
 
-import net.onrc.onos.ofcontroller.core.internal.LinkStorageImpl;
 
 import com.thinkaurelius.titan.core.TitanGraph;
 import com.tinkerpop.blueprints.TransactionalGraph.Conclusion;
@@ -27,7 +26,7 @@
 	}
 	
 	@Override
-	public void init(String conf){
+	public void init(final String dbStore, final String conf){
         Set<String> s = graph.getIndexedKeys(Vertex.class);
         if (!s.contains("dpid")) {
            graph.createKeyIndex("dpid", Vertex.class);
diff --git a/src/test/java/net/onrc/onos/ofcontroller/core/internal/TestableSwitchStorageImpl.java b/src/test/java/net/onrc/onos/ofcontroller/core/internal/TestableSwitchStorageImpl.java
index e0b34e1..82d1faf 100644
--- a/src/test/java/net/onrc/onos/ofcontroller/core/internal/TestableSwitchStorageImpl.java
+++ b/src/test/java/net/onrc/onos/ofcontroller/core/internal/TestableSwitchStorageImpl.java
@@ -18,9 +18,9 @@
 	}
 	
 	@Override
-	public void init(String conf){
+	public void init(final String dbStore, final String conf){
         
-		super.init(conf);
+		super.init(dbStore, conf);
 		
 	}
 }
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 44573bc..d017546 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
@@ -46,6 +46,7 @@
 	protected final static Logger log = LoggerFactory.getLogger(SwitchStorageImpl.class);
 	
 	String conf;
+        String dbStore;
 	DeviceStorageImpl deviceImpl;
     private GraphDBConnection mockConn;
     private GraphDBOperation mockOpe;
@@ -54,6 +55,7 @@
 	public void setUp() throws Exception {
 	    deviceImpl = new DeviceStorageImpl();	
 		conf = "/dummy/path/to/db";
+                dbStore = "dummyStore";
 				
 		PowerMock.mockStatic(GraphDBConnection.class);
 		mockConn = createMock(GraphDBConnection.class);
@@ -69,7 +71,7 @@
         // Replace the conf to dummy conf
 		// String conf = "/tmp/cassandra.titan";
 
-		deviceImpl.init(conf);
+		deviceImpl.init(dbStore, conf);
 
 	}
 
@@ -241,6 +243,7 @@
 		assertNotNull(addedObject);
 		
 		verify(mockDeviceObject);
+
 	}
 
 	/**
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 9964ec3..c80b52a 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
@@ -56,6 +56,7 @@
 	protected static org.slf4j.Logger log = LoggerFactory.getLogger(SwitchStorageImpl.class);
 
 	String conf;
+        String dbStore;
     private GraphDBConnection conn = null;
     private GraphDBOperation ope = null;
     private TitanGraph titanGraph = null;
@@ -66,6 +67,7 @@
 		
 		deviceImpl = new DeviceStorageImpl();
 		conf = "/dummy/path/to/db";
+                dbStore = "dummyStore";
 		
 		// Make mock cassandra DB
 		// Replace TitanFactory.open() to return mock DB
@@ -78,7 +80,7 @@
 		conn = GraphDBConnection.getInstance(conf);
 		ope = new GraphDBOperation(conn);
 		
-		deviceImpl.init(conf);
+		deviceImpl.init(dbStore, conf);
 	}
 
 	@After
diff --git a/src/test/java/net/onrc/onos/ofcontroller/flowmanager/FlowManagerTest.java b/src/test/java/net/onrc/onos/ofcontroller/flowmanager/FlowManagerTest.java
index b43ce1c..73577c1 100644
--- a/src/test/java/net/onrc/onos/ofcontroller/flowmanager/FlowManagerTest.java
+++ b/src/test/java/net/onrc/onos/ofcontroller/flowmanager/FlowManagerTest.java
@@ -485,7 +485,7 @@
 		// start the test
 		replayAll();
 		
-		fm.init("/dummy/path");
+		fm.init("dummy_store", "/dummy/path");
 		
 		// verify the test
 		verifyAll();
diff --git a/src/test/java/net/onrc/onos/ofcontroller/topology/TopologyManagerTest.java b/src/test/java/net/onrc/onos/ofcontroller/topology/TopologyManagerTest.java
index e054e05..8d4ccc0 100644
--- a/src/test/java/net/onrc/onos/ofcontroller/topology/TopologyManagerTest.java
+++ b/src/test/java/net/onrc/onos/ofcontroller/topology/TopologyManagerTest.java
@@ -16,7 +16,10 @@
 
 import com.thinkaurelius.titan.core.TitanGraph;
 import com.thinkaurelius.titan.core.TitanFactory;
+import net.onrc.onos.graph.DBConnection;
+import net.onrc.onos.graph.DBOperation;
 import net.onrc.onos.graph.GraphDBConnection;
+import net.onrc.onos.graph.GraphDBManager;
 import net.onrc.onos.graph.GraphDBOperation;
 import net.onrc.onos.ofcontroller.core.internal.TestDatabaseManager;
 import net.onrc.onos.ofcontroller.topology.TopologyManager;
@@ -34,8 +37,9 @@
 @PrepareForTest({TitanFactory.class, GraphDBConnection.class, GraphDBOperation.class, TopologyManager.class})
 public class TopologyManagerTest {
     String conf;
-    private GraphDBConnection conn = null;
-    private GraphDBOperation oper = null;
+    String dbStore;
+    private DBConnection conn = null;
+    private DBOperation oper = null;
     private TitanGraph titanGraph = null;
     private TopologyManager topologyManager = null;
 
@@ -44,6 +48,7 @@
      */
     @Before
     public void setUp() throws Exception {
+        dbStore = "dummyStore";
 	conf = "/dummy/path/to/db";
 
 	//
@@ -55,9 +60,9 @@
 	EasyMock.expect(TitanFactory.open((String)EasyMock.anyObject())).andReturn(titanGraph);
 	PowerMock.replay(TitanFactory.class);
 
+        oper = GraphDBManager.getDBOperation(dbStore, conf);
 	// Create the connection to the database
-	conn = GraphDBConnection.getInstance(conf);
-	oper = new GraphDBOperation(conn);
+	conn = GraphDBManager.getConnection(dbStore, conf);
 
 	// Populate the database
 	TestDatabaseManager.populateTestData(titanGraph);
diff --git a/start-ramcloud.sh b/start-ramcloud.sh
new file mode 100755
index 0000000..161dc62
--- /dev/null
+++ b/start-ramcloud.sh
@@ -0,0 +1,79 @@
+#!/bin/bash
+
+# Set paths
+ONOS_HOME=`dirname $0`
+RAMCLOUD_DIR=${HOME}/ramcloud
+LOGDIR=${ONOS_HOME}/ONOS/onos-logs
+RAMCLOUD_LOG=${LOGDIR}/ramcloud.`hostname`.log
+RAMCLOUD_COORDINATOR="fast+udp:host=10.128.4.104,port=12246"
+RAMCLOUD_SERVER="fast+udp:host=10.128.100.35,port=12242"
+
+function lotate {
+    logfile=$1
+    nr_max=${2:-10}
+    if [ -f $logfile ]; then
+	for i in `seq $(expr $nr_max - 1) -1 1`; do
+	    if [ -f ${logfile}.${i} ]; then
+		mv -f ${logfile}.${i} ${logfile}.`expr $i + 1`
+	    fi
+	done
+	mv $logfile $logfile.1
+    fi
+}
+
+function start {
+  if [ ! -d ${LOGDIR} ]; then
+    mkdir -p ${LOGDIR}
+  fi
+  echo "rotate log: $log"
+  if [ -f $RAMCLOUD_LOG ]; then
+    lotate $RAMCLOUD_LOG
+  fi
+
+  # Run ramcloud 
+  echo "Starting ramcloud"
+  export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:${HOME}/ramcloud/bindings/java/edu/stanford/ramcloud:${HOME}/ramcloud/obj.blueprint-java
+  $RAMCLOUD_DIR/obj/server -M -r 0 -L $RAMCLOUD_SERVER  -C $RAMCLOUD_COORDINATOR > $RAMCLOUD_LOG 2>&1 &
+}
+
+function stop {
+  # Kill the existing processes
+  capid=`ps -edalf |grep ramcloud |grep obj/server | awk '{print $4}'`
+  pids="$capid"
+  for p in ${pids}; do
+    if [ x$p != "x" ]; then
+      kill -KILL $p
+      echo "Killed existing prosess (pid: $p)"
+    fi
+  done
+}
+
+function deldb {
+#   # Delete the berkeley db database
+   if [ -d "/tmp/ramcloud.conf" ]; then
+      echo "deleting berkeley db dir"
+      sudo rm -rf /tmp/ramcloud.conf
+   fi
+}
+
+case "$1" in
+  start)
+    deldb
+    cp $ONOS_HOME/conf/ramcloud.conf /tmp
+    stop
+    start 
+    ;;
+  stop)
+    stop
+    ;;
+#  deldb)
+#    deldb
+#    ;;
+  status)
+    n=`ps -edalf |grep ramcloud |grep obj/server | wc -l`
+    echo "$n ramcloud server running"
+    ;;
+  *)
+    echo "Usage: $0 {start|stop|restart|status}"
+    exit 1
+esac