Merge branch 'testdev' into syncdev17
diff --git a/src/main/java/net/onrc/onos/flow/FlowManagerImpl.java b/src/main/java/net/onrc/onos/flow/FlowManagerImpl.java
deleted file mode 100644
index 9865deb..0000000
--- a/src/main/java/net/onrc/onos/flow/FlowManagerImpl.java
+++ /dev/null
@@ -1,331 +0,0 @@
-package net.onrc.onos.flow;
-
-import java.util.ArrayList;
-import java.util.Collections;
-import java.util.HashMap;
-import java.util.HashSet;
-import java.util.LinkedList;
-import java.util.List;
-import java.util.Map;
-import java.util.Queue;
-import java.util.Set;
-
-import org.openflow.util.HexString;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-
-import com.tinkerpop.blueprints.Direction;
-import com.tinkerpop.blueprints.Vertex;
-
-import net.floodlightcontroller.core.IOFSwitch;
-import net.onrc.onos.graph.GraphDBOperation;
-import net.onrc.onos.graph.LocalTopologyEventListener;
-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.ISwitchStorage.SwitchState;
-import net.onrc.onos.ofcontroller.util.DataPath;
-import net.onrc.onos.ofcontroller.util.Dpid;
-import net.onrc.onos.ofcontroller.util.FlowEntry;
-import net.onrc.onos.ofcontroller.util.FlowEntryAction;
-import net.onrc.onos.ofcontroller.util.FlowEntryActions;
-import net.onrc.onos.ofcontroller.util.FlowEntryMatch;
-import net.onrc.onos.ofcontroller.util.FlowPath;
-import net.onrc.onos.ofcontroller.util.Port;
-import net.onrc.onos.ofcontroller.util.SwitchPort;
-
-public class FlowManagerImpl implements IFlowManager {
-	
-	protected final static Logger log = LoggerFactory.getLogger(LocalTopologyEventListener.class);
-	protected GraphDBOperation op;
-
-	@Override
-	public void createFlow(IPortObject src_port, IPortObject dest_port) {
-		// TODO Auto-generated method stub
-
-	}
-
-	@Override
-	public Iterable<FlowPath> getFlows(IPortObject src_port,
-			IPortObject dest_port) {
-		// TODO Auto-generated method stub
-		return null;
-	}
-
-	@Override
-	public Iterable<FlowPath> getOutFlows(IPortObject port) {
-		// TODO Auto-generated method stub
-		List<FlowPath> flowPaths = new ArrayList<FlowPath> ();
-		Iterable<IFlowEntry> flowEntries = port.getOutFlowEntries();
-
-		for(IFlowEntry fe: flowEntries) {
-			IFlowPath flow = fe.getFlow();
-			FlowPath flowPath = new FlowPath(flow);
-			flowPaths.add(flowPath);
-		}
-		return flowPaths;
-	}
-
-	@Override
-	public void reconcileFlows(IPortObject src_port) {
-		// TODO Auto-generated method stub
-
-		log.debug("Reconcile Flows for Port removed: {}:{}",src_port.getSwitch().getDPID(),src_port.getNumber());
-		Iterable<IFlowEntry> flowEntries = src_port.getOutFlowEntries();
-
-		for(IFlowEntry fe: flowEntries) {
-			IFlowPath flow = fe.getFlow();
-			reconcileFlow(flow);
-		}
-	}
-
-	private void reconcileFlow(IFlowPath flow) {
-		// TODO Auto-generated method stub
-		String src_dpid = flow.getSrcSwitch();
-		String dst_dpid = flow.getDstSwitch();
-		Short src_port = flow.getSrcPort();
-		Short dst_port = flow.getDstPort();
-		IPortObject src = null;
-		IPortObject dst = null;
-		src = op.searchPort(src_dpid, src_port);
-		dst = op.searchPort(dst_dpid, dst_port);
-		if (src != null && dst != null) {
-			FlowPath newFlow = this.computeFlowPath(src,dst);
-			installFlow(newFlow);
-			removeFlow(flow);
-		}
-		
-	}
-
-	private void removeFlow(IFlowPath flow) {
-		// TODO Auto-generated method stub
-		
-	}
-
-	private void installFlow(FlowPath newFlow) {
-		// TODO Auto-generated method stub
-		
-	}
-
-	@Override
-	public void reconcileFlow(IPortObject src_port, IPortObject dest_port) {
-		// TODO Auto-generated method stub
-
-	}
-
-	@Override
-	public FlowPath computeFlowPath(IPortObject src_port, IPortObject dest_port) {
-		// TODO Auto-generated method stub
-		DataPath dataPath = new DataPath(); 
-		
-		// FIXME: Bad idea to use FloodLight data structures (SwitchPort)
-		
-		dataPath.setSrcPort(new SwitchPort(new Dpid(src_port.getSwitch().getDPID()),
-						new Port(src_port.getNumber())));
-		dataPath.setDstPort(new SwitchPort(new Dpid(src_port.getSwitch().getDPID()),
-				new Port(src_port.getNumber())));
-		
-		if (src_port.getSwitch().equals(dest_port.getSwitch())) {
-			// on same switch create quick path
-			FlowEntry flowEntry = new FlowEntry();
-		    flowEntry.setDpid(new Dpid(src_port.getSwitch().getDPID()));
-		    flowEntry.setInPort(new Port(src_port.getNumber()));
-		    flowEntry.setOutPort(new Port(src_port.getNumber()));
-		    flowEntry.setFlowEntryMatch(new FlowEntryMatch());
-		    flowEntry.flowEntryMatch().enableInPort(flowEntry.inPort());
-
-		    // Set the outgoing port output action
-		    FlowEntryActions flowEntryActions = flowEntry.flowEntryActions();
-		    FlowEntryAction flowEntryAction = new FlowEntryAction();
-		    flowEntryAction.setActionOutput(flowEntry.outPort());
-		    flowEntryActions.addAction(flowEntryAction);
-		    dataPath.flowEntries().add(flowEntry);
-		    
-		    FlowPath flowPath = new FlowPath();
-			flowPath.setDataPath(dataPath);
-
-			return flowPath;
-		}
-		Vertex v_src = src_port.getSwitch().asVertex();	
-		Vertex v_dest = dest_port.getSwitch().asVertex();
-
-		//
-		// Implement the Shortest Path computation by using Breath First Search
-		//
-		Set<Vertex> visitedSet = new HashSet<Vertex>();
-		Queue<Vertex> processingList = new LinkedList<Vertex>();
-		Map<Vertex, Vertex> previousVertexMap = new HashMap<Vertex, Vertex>();
-
-		processingList.add(v_src);
-		visitedSet.add(v_src);
-		Boolean path_found = false;
-		while (! processingList.isEmpty()) {
-		    Vertex nextVertex = processingList.poll();
-		    if (v_dest.equals(nextVertex)) {
-			path_found = true;
-			break;
-		    }
-		    for (Vertex parentPort : nextVertex.getVertices(Direction.OUT, "on")) {
-			for (Vertex childPort : parentPort.getVertices(Direction.OUT, "link")) {
-			    for (Vertex child : childPort.getVertices(Direction.IN, "on")) {
-				// Ignore inactive switches
-				String state = child.getProperty("state").toString();
-				if (! state.equals(SwitchState.ACTIVE.toString()))
-				    continue;
-
-				if (! visitedSet.contains(child)) {
-				    previousVertexMap.put(parentPort, nextVertex);
-				    previousVertexMap.put(childPort, parentPort);
-				    previousVertexMap.put(child, childPort);
-				    visitedSet.add(child);
-				    processingList.add(child);
-				}
-			    }
-			}
-		    }
-		}
-		if (! path_found) {
-		    return null;		// No path found
-		}
-
-		List<Vertex> resultPath = new LinkedList<Vertex>();
-		Vertex previousVertex = v_dest;
-		resultPath.add(v_dest);
-		while (! v_src.equals(previousVertex)) {
-		    Vertex currentVertex = previousVertexMap.get(previousVertex);
-		    resultPath.add(currentVertex);
-		    previousVertex = currentVertex;
-		}
-		Collections.reverse(resultPath);
-		
-		// Loop through the result and prepare the return result
-		// as a list of Flow Entries.
-		//
-		long nodeId = 0;
-		short portId = 0;
-		Port inPort = new Port(src_port.getNumber());
-		Port outPort = new Port();
-		int idx = 0;
-		for (Vertex v: resultPath) {
-		    String type = v.getProperty("type").toString();
-		    // System.out.println("type: " + type);
-		    if (type.equals("port")) {
-			//String number = v.getProperty("number").toString();
-			// System.out.println("number: " + number);
-
-			Object obj = v.getProperty("number");
-			// String class_str = obj.getClass().toString();
-			if (obj instanceof Short) {
-			    portId = (Short)obj;
-			} else if (obj instanceof Integer) {
-			    Integer int_nodeId = (Integer)obj;
-			    portId = int_nodeId.shortValue();
-			    // int int_nodeId = (Integer)obj;
-			    // portId = (short)int_nodeId.;
-			}
-		    } else if (type.equals("switch")) {
-			String dpid = v.getProperty("dpid").toString();
-			nodeId = HexString.toLong(dpid);
-
-			// System.out.println("dpid: " + dpid);
-		    }
-		    idx++;
-		    if (idx == 1) {
-			continue;
-		    }
-		    int mod = idx % 3;
-		    if (mod == 0) {
-			// Setup the incoming port
-			inPort = new Port(portId);
-			continue;
-		    }
-		    if (mod == 2) {
-			// Setup the outgoing port, and add the Flow Entry
-			outPort = new Port(portId);
-
-			FlowEntry flowEntry = new FlowEntry();
-			flowEntry.setDpid(new Dpid(nodeId));
-			flowEntry.setInPort(inPort);
-			flowEntry.setOutPort(outPort);
-			flowEntry.setFlowEntryMatch(new FlowEntryMatch());
-		    flowEntry.flowEntryMatch().enableInPort(flowEntry.inPort());
-		    
-		    // Set the outgoing port output action
-		    FlowEntryActions flowEntryActions = flowEntry.flowEntryActions();
-		    FlowEntryAction flowEntryAction = new FlowEntryAction();
-		    flowEntryAction.setActionOutput(flowEntry.outPort());
-		    flowEntryActions.addAction(flowEntryAction);
-		    dataPath.flowEntries().add(flowEntry);
-			continue;
-		    }
-		}
-		if (idx > 0) {
-		    // Add the last Flow Entry
-		    FlowEntry flowEntry = new FlowEntry();
-		    flowEntry.setDpid(new Dpid(nodeId));
-		    flowEntry.setInPort(inPort);
-		    flowEntry.setOutPort(new Port(dest_port.getNumber()));
-		    flowEntry.setFlowEntryMatch(new FlowEntryMatch());
-		    flowEntry.flowEntryMatch().enableInPort(flowEntry.inPort());
-		    
-		    // Set the outgoing port output action
-		    FlowEntryActions flowEntryActions = flowEntry.flowEntryActions();
-		    FlowEntryAction flowEntryAction = new FlowEntryAction();
-		    flowEntryAction.setActionOutput(flowEntry.outPort());
-		    flowEntryActions.addAction(flowEntryAction);
-		    dataPath.flowEntries().add(flowEntry);
-		    // TODO (BOC): why is this twice?
-		    dataPath.flowEntries().add(flowEntry);
-		}
-
-	
-		if (dataPath.flowEntries().size() > 0) {
-		    FlowPath flowPath = new FlowPath();
-			flowPath.setDataPath(dataPath);
-
-			return flowPath;
-		}
-		return null;		
-		
-	}
-
-	@Override
-	public Iterable<FlowEntry> getFlowEntries(FlowPath flow) {
-		// TODO Auto-generated method stub
-		return null;
-	}
-
-
-	@Override
-	public boolean installRemoteFlowEntry(FlowPath flowPath,
-					      FlowEntry entry) {
-		// TODO Auto-generated method stub
-		return false;
-	}
-
-	@Override
-	public boolean removeRemoteFlowEntry(FlowPath flowPath,
-					     FlowEntry entry) {
-		return false;
-		// TODO Auto-generated method stub
-
-	}
-
-	@Override
-	public boolean installFlowEntry(IOFSwitch mySwitch,
-					FlowPath flowPath,
-					FlowEntry flowEntry) {
-		// TODO Auto-generated method stub
-		return false;
-	}
-
-	@Override
-	public boolean removeFlowEntry(IOFSwitch mySwitch,
-				       FlowPath flowPath,
-				       FlowEntry flowEntry) {
-		// TODO Auto-generated method stub
-		return false;
-	}
-	
-
-}
diff --git a/src/main/java/net/onrc/onos/flow/IFlowManager.java b/src/main/java/net/onrc/onos/flow/IFlowManager.java
deleted file mode 100644
index 598da85..0000000
--- a/src/main/java/net/onrc/onos/flow/IFlowManager.java
+++ /dev/null
@@ -1,126 +0,0 @@
-package net.onrc.onos.flow;
-
-import net.floodlightcontroller.core.IOFSwitch;
-import net.onrc.onos.ofcontroller.core.INetMapTopologyObjects.IPortObject;
-import net.onrc.onos.ofcontroller.util.FlowEntry;
-import net.onrc.onos.ofcontroller.util.FlowPath;
-
-public interface IFlowManager {
-    /**
-     * Create a Flow from port to port.
-     *
-     * TODO: We don't need it for now.
-     *
-     * @param src_port the source port.
-     * @param dest_port the destination port.
-     */
-    public void createFlow(IPortObject src_port, IPortObject dest_port);
-
-    /**
-     * Get all Flows matching a source and a destination port.
-     *
-     * TODO: Pankaj might be implementing it later.
-     *
-     * @param src_port the source port to match.
-     * @param dest_port the destination port to match.
-     * @return all flows matching the source and the destination port.
-     */
-    public Iterable<FlowPath> getFlows(IPortObject src_port,
-				       IPortObject dest_port);
-
-    /**
-     * Get all Flows going out from a port.
-     *
-     * TODO: We need it now: Pankaj
-     *
-     * @param port the port to match.
-     * @return the list of flows that are going out from the port.
-     */
-    public Iterable<FlowPath> getOutFlows(IPortObject port);
-
-    /**
-     * Reconcile all flows on inactive switch port.
-     *
-     * @param portObject the port that has become inactive.
-     */
-    public void reconcileFlows(IPortObject portObject);
-
-    /**
-     * Reconcile all flows between a source and a destination port.
-     *
-     * TODO: We don't need it for now.
-     *
-     * @param src_port the source port.
-     * @param dest_port the destination port.
-     */
-    public void reconcileFlow(IPortObject src_port, IPortObject dest_port);
-
-    /**
-     * Compute the shortest path between a source and a destination ports.
-     *
-     * @param src_port the source port.
-     * @param dest_port the destination port.
-     * @return the computed shortest path between the source and the
-     * destination ports. The flow entries in the path itself would
-     * contain the incoming port matching and the outgoing port output
-     * actions set. However, the path itself will NOT have the Flow ID,
-     * Installer ID, and any additional matching conditions for the
-     * flow entries (e.g., source or destination MAC address, etc).
-     */
-    public FlowPath computeFlowPath(IPortObject src_port,
-				    IPortObject dest_port);
-
-    /**
-     * Get all Flow Entries of a Flow.
-     *
-     * @param flow the flow whose flow entries should be returned.
-     * @return the flow entries of the flow.
-     */
-    public Iterable<FlowEntry> getFlowEntries(FlowPath flow);
-
-    /**
-     * Install a Flow Entry on a switch.
-     *
-     * @param mySwitch the switch to install the Flow Entry into.
-     * @param flowPath the flow path for the flow entry to install.
-     * @param flowEntry the flow entry to install.
-     * @return true on success, otherwise false.
-     */
-    public boolean installFlowEntry(IOFSwitch mySwitch, FlowPath flowPath,
-				    FlowEntry flowEntry);
-
-    /**
-     * Remove a Flow Entry from a switch.
-     *
-     * @param mySwitch the switch to remove the Flow Entry from.
-     * @param flowPath the flow path for the flow entry to remove.
-     * @param flowEntry the flow entry to remove.
-     * @return true on success, otherwise false.
-     */
-    public boolean removeFlowEntry(IOFSwitch mySwitch, FlowPath flowPath,
-				   FlowEntry flowEntry);
-
-    /**
-     * Install a Flow Entry on a remote controller.
-     *
-     * TODO: We need it now: Jono
-     * - For now it will make a REST call to the remote controller.
-     * - Internally, it needs to know the name of the remote controller.
-     *
-     * @param flowPath the flow path for the flow entry to install.
-     * @param flowEntry the flow entry to install.
-     * @return true on success, otherwise false.
-     */
-    public boolean installRemoteFlowEntry(FlowPath flowPath,
-					  FlowEntry flowEntry);
-
-    /**
-     * Remove a flow entry on a remote controller.
-     *
-     * @param flowPath the flow path for the flow entry to remove.
-     * @param flowEntry the flow entry to remove.
-     * @return true on success, otherwise false.
-     */
-    public boolean removeRemoteFlowEntry(FlowPath flowPath,
-					 FlowEntry flowEntry);
-}
diff --git a/src/main/java/net/onrc/onos/graph/LocalTopologyEventListener.java b/src/main/java/net/onrc/onos/graph/LocalTopologyEventListener.java
index 5388233..40f5044 100644
--- a/src/main/java/net/onrc/onos/graph/LocalTopologyEventListener.java
+++ b/src/main/java/net/onrc/onos/graph/LocalTopologyEventListener.java
@@ -1,7 +1,5 @@
 package net.onrc.onos.graph;
 
-import net.onrc.onos.flow.FlowManagerImpl;
-import net.onrc.onos.flow.IFlowManager;
 import net.onrc.onos.ofcontroller.core.INetMapTopologyObjects.IPortObject;
 
 import org.slf4j.Logger;
@@ -52,9 +50,12 @@
 																src_port.getNumber(),
 																dest_port.getSwitch().getDPID(),
 																dest_port.getNumber()});
-			IFlowManager manager = new FlowManagerImpl();
 			// TODO: Find the flows and add to reconcile queue
-			manager.reconcileFlows(src_port);
+			//
+			// NOTE: Old code/logic.
+			//
+			// IFlowService flowManager = ...
+			// flowManager.reconcileFlows(src_port);
 		}
 	}
 
@@ -81,8 +82,11 @@
 			
 			IPortObject src_port = conn.getFramedGraph().frame(vertex, IPortObject.class);
 			log.debug("TopologyEvents: Port removed: {}:{}",src_port.getSwitch().getDPID(),src_port.getNumber());
-			IFlowManager manager = new FlowManagerImpl();
-			manager.reconcileFlows(src_port);			
+
+			// NOTE: Old code/logic.
+			//
+			// IFlowService flowManager = ...
+			// flowManager.reconcileFlows(src_port);
 		}
 	}
 
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 a1216f4..58a590f 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/flowmanager/FlowDatabaseOperation.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/flowmanager/FlowDatabaseOperation.java
@@ -25,7 +25,7 @@
 /**
  * Class for performing Flow-related operations on the Database.
  */
-class FlowDatabaseOperation {
+public class FlowDatabaseOperation {
     private final static Logger log = LoggerFactory.getLogger(FlowDatabaseOperation.class);
 
     /**
diff --git a/src/main/java/net/onrc/onos/ofcontroller/flowmanager/FlowEventHandler.java b/src/main/java/net/onrc/onos/ofcontroller/flowmanager/FlowEventHandler.java
index 0e9887a..eccf40b 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/flowmanager/FlowEventHandler.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/flowmanager/FlowEventHandler.java
@@ -171,18 +171,28 @@
 		//  - EventEntry<FlowEntry>
 		//
 		for (EventEntry<?> event : collection) {
+		    // Topology event
 		    if (event.eventData() instanceof TopologyElement) {
 			EventEntry<TopologyElement> topologyEventEntry =
 			    (EventEntry<TopologyElement>)event;
 			topologyEvents.add(topologyEventEntry);
-		    } else if (event.eventData() instanceof FlowPath) {
+			continue;
+		    }
+
+		    // FlowPath event
+		    if (event.eventData() instanceof FlowPath) {
 			EventEntry<FlowPath> flowPathEventEntry =
 			    (EventEntry<FlowPath>)event;
 			flowPathEvents.add(flowPathEventEntry);
-		    } else if (event.eventData() instanceof FlowEntry) {
+			continue;
+		    }
+
+		    // FlowEntry event
+		    if (event.eventData() instanceof FlowEntry) {
 			EventEntry<FlowEntry> flowEntryEventEntry =
 			    (EventEntry<FlowEntry>)event;
 			flowEntryEvents.add(flowEntryEventEntry);
+			continue;
 		    }
 		}
 		collection.clear();
@@ -710,9 +720,18 @@
 	    //
 	    newFlowEntry.setFlowId(new FlowId(flowPath.flowId().value()));
 
-	    // Set the incoming port matching
-	    FlowEntryMatch flowEntryMatch = new FlowEntryMatch();
+	    //
+	    // Allocate the FlowEntryMatch by copying the default one
+	    // from the FlowPath (if set).
+	    //
+	    FlowEntryMatch flowEntryMatch = null;
+	    if (flowPath.flowEntryMatch() != null)
+		flowEntryMatch = new FlowEntryMatch(flowPath.flowEntryMatch());
+	    else
+		flowEntryMatch = new FlowEntryMatch();
 	    newFlowEntry.setFlowEntryMatch(flowEntryMatch);
+
+	    // Set the incoming port matching
 	    flowEntryMatch.enableInPort(newFlowEntry.inPort());
 
 	    //
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 d3b5375..bdd0355 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/flowmanager/FlowManager.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/flowmanager/FlowManager.java
@@ -2,7 +2,6 @@
 
 import java.util.ArrayList;
 import java.util.Collection;
-import java.util.EnumSet;
 import java.util.HashMap;
 import java.util.LinkedList;
 import java.util.Map;
@@ -19,7 +18,6 @@
 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.datagrid.IDatagridService;
 import net.onrc.onos.graph.GraphDBOperation;
 import net.onrc.onos.ofcontroller.core.INetMapStorage;
@@ -39,9 +37,6 @@
  * Flow Manager class for handling the network flows.
  */
 public class FlowManager implements IFloodlightModule, IFlowService, INetMapStorage {
-    // flag to use FlowPusher instead of FlowSwitchOperation/MessageDamper
-    private final static boolean enableFlowPusher = true;
-
     protected GraphDBOperation dbHandlerApi;
     protected GraphDBOperation dbHandlerInner;
 
@@ -53,15 +48,6 @@
 
     protected IFlowPusherService pusher;
     
-    protected OFMessageDamper messageDamper;
-    
-    //
-    // TODO: Values copied from elsewhere (class LearningSwitch).
-    // The local copy should go away!
-    //
-    protected static final int OFMESSAGE_DAMPER_CAPACITY = 50000; // TODO: find sweet spot
-    protected static final int OFMESSAGE_DAMPER_TIMEOUT = 250;	// ms
-
     // Flow Entry ID generation state
     private static Random randomGenerator = new Random();
     private static int nextFlowEntryIdPrefix = 0;
@@ -161,14 +147,7 @@
 	floodlightProvider = context.getServiceImpl(IFloodlightProviderService.class);
 	datagridService = context.getServiceImpl(IDatagridService.class);
 	restApi = context.getServiceImpl(IRestApiService.class);
-
-	if (enableFlowPusher) {
-	    pusher = context.getServiceImpl(IFlowPusherService.class);
-	} else {
-	    messageDamper = new OFMessageDamper(OFMESSAGE_DAMPER_CAPACITY,
-	    EnumSet.of(OFType.FLOW_MOD),
-	    OFMESSAGE_DAMPER_TIMEOUT);
-	}
+	pusher = context.getServiceImpl(IFlowPusherService.class);
 
 	this.init("");
     }
@@ -413,42 +392,6 @@
     }
 
     /**
-     * Install a Flow Entry on a switch.
-     *
-     * @param mySwitch the switch to install the Flow Entry into.
-     * @param flowPath the flow path for the flow entry to install.
-     * @param flowEntry the flow entry to install.
-     * @return true on success, otherwise false.
-     */
-    private boolean installFlowEntry(IOFSwitch mySwitch, FlowPath flowPath,
-				    FlowEntry flowEntry) {
-    	if (enableFlowPusher) {
-	    return pusher.add(mySwitch, flowPath, flowEntry);
-    	} else {
-	    return FlowSwitchOperation.installFlowEntry(
-		floodlightProvider.getOFMessageFactory(),
-		messageDamper, mySwitch, flowPath, flowEntry);
-    	}
-    }
-
-    /**
-     * Remove a Flow Entry from a switch.
-     *
-     * @param mySwitch the switch to remove the Flow Entry from.
-     * @param flowPath the flow path for the flow entry to remove.
-     * @param flowEntry the flow entry to remove.
-     * @return true on success, otherwise false.
-     */
-    private boolean removeFlowEntry(IOFSwitch mySwitch, FlowPath flowPath,
-				   FlowEntry flowEntry) {
-	//
-	// The installFlowEntry() method implements both installation
-	// and removal of flow entries.
-	//
-	return (installFlowEntry(mySwitch, flowPath, flowEntry));
-    }
-
-    /**
      * Inform the Flow Manager that a Flow Entry on switch expired.
      *
      * @param sw the switch the Flow Entry expired on.
@@ -474,7 +417,6 @@
 	Map<Long, IOFSwitch> mySwitches = getMySwitches();
 
 	for (FlowPathEntryPair flowPair : modifiedFlowEntries) {
-	    FlowPath flowPath = flowPair.flowPath;
 	    FlowEntry flowEntry = flowPair.flowEntry;
 
 	    IOFSwitch mySwitch = mySwitches.get(flowEntry.dpid().value());
@@ -484,12 +426,12 @@
 	    log.debug("Pushing Flow Entry To Switch: {}", flowEntry.toString());
 
 	    //
-	    // Install the Flow Entry into the switch
+	    // Push the Flow Entry into the switch
 	    //
-	    if (! installFlowEntry(mySwitch, flowPath, flowEntry)) {
+	    if (! pusher.add(mySwitch, flowEntry)) {
 		String logMsg = "Cannot install Flow Entry " +
 		    flowEntry.flowEntryId() +
-		    " from Flow Path " + flowPath.flowId() +
+		    " from Flow Path " + flowEntry.flowId() +
 		    " on switch " + flowEntry.dpid();
 		log.error(logMsg);
 		continue;
@@ -518,6 +460,9 @@
 	for (FlowPathEntryPair flowPair : modifiedFlowEntries) {
 	    FlowEntry flowEntry = flowPair.flowEntry;
 
+	    if (! flowEntry.isValidFlowEntryId())
+		continue;
+
 	    IOFSwitch mySwitch = mySwitches.get(flowEntry.dpid().value());
 
 	    //
@@ -536,8 +481,6 @@
 		    FlowEntryUserState.FE_USER_DELETE) {
 		    continue;
 		}
-		if (! flowEntry.isValidFlowEntryId())
-		    continue;
 	    }
 
 	    log.debug("Pushing Flow Entry To Datagrid: {}", flowEntry.toString());
diff --git a/src/main/java/net/onrc/onos/ofcontroller/flowmanager/FlowSwitchOperation.java b/src/main/java/net/onrc/onos/ofcontroller/flowmanager/FlowSwitchOperation.java
deleted file mode 100644
index 8bed120..0000000
--- a/src/main/java/net/onrc/onos/ofcontroller/flowmanager/FlowSwitchOperation.java
+++ /dev/null
@@ -1,689 +0,0 @@
-package net.onrc.onos.ofcontroller.flowmanager;
-
-import java.io.IOException;
-import java.util.ArrayList;
-import java.util.List;
-
-import net.floodlightcontroller.core.IOFSwitch;
-import net.floodlightcontroller.util.MACAddress;
-import net.floodlightcontroller.util.OFMessageDamper;
-
-import net.onrc.onos.ofcontroller.core.INetMapTopologyObjects.IFlowEntry;
-import net.onrc.onos.ofcontroller.core.INetMapTopologyObjects.IFlowPath;
-import net.onrc.onos.ofcontroller.util.*;
-import net.onrc.onos.ofcontroller.util.FlowEntryAction.*;
-
-import org.openflow.protocol.OFFlowMod;
-import org.openflow.protocol.OFMatch;
-import org.openflow.protocol.OFPacketOut;
-import org.openflow.protocol.OFPort;
-import org.openflow.protocol.OFType;
-import org.openflow.protocol.action.*;
-import org.openflow.protocol.factory.BasicFactory;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-
-/**
- * Class for performing Flow-related operations on the Switch.
- */
-class FlowSwitchOperation {
-    private final static Logger log = LoggerFactory.getLogger(FlowSwitchOperation.class);
-    //
-    // TODO: Values copied from elsewhere (class LearningSwitch).
-    // The local copy should go away!
-    //
-    public static final short PRIORITY_DEFAULT = 100;
-    public static final short FLOWMOD_DEFAULT_IDLE_TIMEOUT = 0;	// infinity
-    public static final short FLOWMOD_DEFAULT_HARD_TIMEOUT = 0;	// infinite
-
-    // TODO add Pusher instance member
-    // 
-    
-    /**
-     * Install a Flow Entry on a switch.
-     *
-     * @param messageFactory the OpenFlow message factory to use.
-     * @param messageDamper the OpenFlow message damper to use.
-     * @param mySwitch the switch to install the Flow Entry into.
-     * @param flowObj the flow path object for the flow entry to install.
-     * @param flowEntryObj the flow entry object to install.
-     * @return true on success, otherwise false.
-     */
-    static boolean installFlowEntry(BasicFactory messageFactory,
-				    OFMessageDamper messageDamper,
-				    IOFSwitch mySwitch, IFlowPath flowObj,
-				    IFlowEntry flowEntryObj) {
-	String flowEntryIdStr = flowEntryObj.getFlowEntryId();
-	if (flowEntryIdStr == null)
-	    return false;
-	FlowEntryId flowEntryId = new FlowEntryId(flowEntryIdStr);
-	String userState = flowEntryObj.getUserState();
-	if (userState == null)
-	    return false;
-
-	//
-	// Create the Open Flow Flow Modification Entry to push
-	//
-	OFFlowMod fm = (OFFlowMod)messageFactory.getMessage(OFType.FLOW_MOD);
-	long cookie = flowEntryId.value();
-
-	short flowModCommand = OFFlowMod.OFPFC_ADD;
-	if (userState.equals("FE_USER_ADD")) {
-	    flowModCommand = OFFlowMod.OFPFC_ADD;
-	} else if (userState.equals("FE_USER_MODIFY")) {
-	    flowModCommand = OFFlowMod.OFPFC_MODIFY_STRICT;
-	} else if (userState.equals("FE_USER_DELETE")) {
-	    flowModCommand = OFFlowMod.OFPFC_DELETE_STRICT;
-	} else {
-	    // Unknown user state. Ignore the entry
-	    log.debug("Flow Entry ignored (FlowEntryId = {}): unknown user state {}",
-		      flowEntryId.toString(), userState);
-	    return false;
-	}
-
-	//
-	// Fetch the match conditions.
-	//
-	// NOTE: The Flow matching conditions common for all Flow Entries are
-	// used ONLY if a Flow Entry does NOT have the corresponding matching
-	// condition set.
-	//
-	OFMatch match = new OFMatch();
-	match.setWildcards(OFMatch.OFPFW_ALL);
-
-	// Match the Incoming Port
-	Short matchInPort = flowEntryObj.getMatchInPort();
-	if (matchInPort != null) {
-	    match.setInputPort(matchInPort);
-	    match.setWildcards(match.getWildcards() & ~OFMatch.OFPFW_IN_PORT);
-	}
-
-	// Match the Source MAC address
-	String matchSrcMac = flowEntryObj.getMatchSrcMac();
-	if (matchSrcMac == null)
-	    matchSrcMac = flowObj.getMatchSrcMac();
-	if (matchSrcMac != null) {
-	    match.setDataLayerSource(matchSrcMac);
-	    match.setWildcards(match.getWildcards() & ~OFMatch.OFPFW_DL_SRC);
-	}
-
-	// Match the Destination MAC address
-	String matchDstMac = flowEntryObj.getMatchDstMac();
-	if (matchDstMac == null)
-	    matchDstMac = flowObj.getMatchDstMac();
-	if (matchDstMac != null) {
-	    match.setDataLayerDestination(matchDstMac);
-	    match.setWildcards(match.getWildcards() & ~OFMatch.OFPFW_DL_DST);
-	}
-
-	// Match the Ethernet Frame Type
-	Short matchEthernetFrameType = flowEntryObj.getMatchEthernetFrameType();
-	if (matchEthernetFrameType == null)
-	    matchEthernetFrameType = flowObj.getMatchEthernetFrameType();
-	if (matchEthernetFrameType != null) {
-	    match.setDataLayerType(matchEthernetFrameType);
-	    match.setWildcards(match.getWildcards() & ~OFMatch.OFPFW_DL_TYPE);
-	}
-
-	// Match the VLAN ID
-	Short matchVlanId = flowEntryObj.getMatchVlanId();
-	if (matchVlanId == null)
-	    matchVlanId = flowObj.getMatchVlanId();
-	if (matchVlanId != null) {
-	    match.setDataLayerVirtualLan(matchVlanId);
-	    match.setWildcards(match.getWildcards() & ~OFMatch.OFPFW_DL_VLAN);
-	}
-
-	// Match the VLAN priority
-	Byte matchVlanPriority = flowEntryObj.getMatchVlanPriority();
-	if (matchVlanPriority == null)
-	    matchVlanPriority = flowObj.getMatchVlanPriority();
-	if (matchVlanPriority != null) {
-	    match.setDataLayerVirtualLanPriorityCodePoint(matchVlanPriority);
-	    match.setWildcards(match.getWildcards() & ~OFMatch.OFPFW_DL_VLAN_PCP);
-	}
-
-	// Match the Source IPv4 Network prefix
-	String matchSrcIPv4Net = flowEntryObj.getMatchSrcIPv4Net();
-	if (matchSrcIPv4Net == null)
-	    matchSrcIPv4Net = flowObj.getMatchSrcIPv4Net();
-	if (matchSrcIPv4Net != null) {
-	    match.setFromCIDR(matchSrcIPv4Net, OFMatch.STR_NW_SRC);
-	}
-
-	// Natch the Destination IPv4 Network prefix
-	String matchDstIPv4Net = flowEntryObj.getMatchDstIPv4Net();
-	if (matchDstIPv4Net == null)
-	    matchDstIPv4Net = flowObj.getMatchDstIPv4Net();
-	if (matchDstIPv4Net != null) {
-	    match.setFromCIDR(matchDstIPv4Net, OFMatch.STR_NW_DST);
-	}
-
-	// Match the IP protocol
-	Byte matchIpProto = flowEntryObj.getMatchIpProto();
-	if (matchIpProto == null)
-	    matchIpProto = flowObj.getMatchIpProto();
-	if (matchIpProto != null) {
-	    match.setNetworkProtocol(matchIpProto);
-	    match.setWildcards(match.getWildcards() & ~OFMatch.OFPFW_NW_PROTO);
-	}
-
-	// Match the IP ToS (DSCP field, 6 bits)
-	Byte matchIpToS = flowEntryObj.getMatchIpToS();
-	if (matchIpToS == null)
-	    matchIpToS = flowObj.getMatchIpToS();
-	if (matchIpToS != null) {
-	    match.setNetworkTypeOfService(matchIpToS);
-	    match.setWildcards(match.getWildcards() & ~OFMatch.OFPFW_NW_TOS);
-	}
-
-	// Match the Source TCP/UDP port
-	Short matchSrcTcpUdpPort = flowEntryObj.getMatchSrcTcpUdpPort();
-	if (matchSrcTcpUdpPort == null)
-	    matchSrcTcpUdpPort = flowObj.getMatchSrcTcpUdpPort();
-	if (matchSrcTcpUdpPort != null) {
-	    match.setTransportSource(matchSrcTcpUdpPort);
-	    match.setWildcards(match.getWildcards() & ~OFMatch.OFPFW_TP_SRC);
-	}
-
-	// Match the Destination TCP/UDP port
-	Short matchDstTcpUdpPort = flowEntryObj.getMatchDstTcpUdpPort();
-	if (matchDstTcpUdpPort == null)
-	    matchDstTcpUdpPort = flowObj.getMatchDstTcpUdpPort();
-	if (matchDstTcpUdpPort != null) {
-	    match.setTransportDestination(matchDstTcpUdpPort);
-	    match.setWildcards(match.getWildcards() & ~OFMatch.OFPFW_TP_DST);
-	}
-
-	//
-	// Fetch the actions
-	//
-	Short actionOutputPort = null;
-	List<OFAction> openFlowActions = new ArrayList<OFAction>();
-	int actionsLen = 0;
-	FlowEntryActions flowEntryActions = null;
-	String actionsStr = flowEntryObj.getActions();
-	if (actionsStr != null)
-	    flowEntryActions = new FlowEntryActions(actionsStr);
-	else
-	    flowEntryActions = new FlowEntryActions();
-	for (FlowEntryAction action : flowEntryActions.actions()) {
-	    ActionOutput actionOutput = action.actionOutput();
-	    ActionSetVlanId actionSetVlanId = action.actionSetVlanId();
-	    ActionSetVlanPriority actionSetVlanPriority = action.actionSetVlanPriority();
-	    ActionStripVlan actionStripVlan = action.actionStripVlan();
-	    ActionSetEthernetAddr actionSetEthernetSrcAddr = action.actionSetEthernetSrcAddr();
-	    ActionSetEthernetAddr actionSetEthernetDstAddr = action.actionSetEthernetDstAddr();
-	    ActionSetIPv4Addr actionSetIPv4SrcAddr = action.actionSetIPv4SrcAddr();
-	    ActionSetIPv4Addr actionSetIPv4DstAddr = action.actionSetIPv4DstAddr();
-	    ActionSetIpToS actionSetIpToS = action.actionSetIpToS();
-	    ActionSetTcpUdpPort actionSetTcpUdpSrcPort = action.actionSetTcpUdpSrcPort();
-	    ActionSetTcpUdpPort actionSetTcpUdpDstPort = action.actionSetTcpUdpDstPort();
-	    ActionEnqueue actionEnqueue = action.actionEnqueue();
-
-	    if (actionOutput != null) {
-		actionOutputPort = actionOutput.port().value();
-		// XXX: The max length is hard-coded for now
-		OFActionOutput ofa =
-		    new OFActionOutput(actionOutput.port().value(),
-				       (short)0xffff);
-		openFlowActions.add(ofa);
-		actionsLen += ofa.getLength();
-	    }
-
-	    if (actionSetVlanId != null) {
-		OFActionVirtualLanIdentifier ofa =
-		    new OFActionVirtualLanIdentifier(actionSetVlanId.vlanId());
-		openFlowActions.add(ofa);
-		actionsLen += ofa.getLength();
-	    }
-
-	    if (actionSetVlanPriority != null) {
-		OFActionVirtualLanPriorityCodePoint ofa =
-		    new OFActionVirtualLanPriorityCodePoint(actionSetVlanPriority.vlanPriority());
-		openFlowActions.add(ofa);
-		actionsLen += ofa.getLength();
-	    }
-
-	    if (actionStripVlan != null) {
-		if (actionStripVlan.stripVlan() == true) {
-		    OFActionStripVirtualLan ofa = new OFActionStripVirtualLan();
-		    openFlowActions.add(ofa);
-		    actionsLen += ofa.getLength();
-		}
-	    }
-
-	    if (actionSetEthernetSrcAddr != null) {
-		OFActionDataLayerSource ofa = 
-		    new OFActionDataLayerSource(actionSetEthernetSrcAddr.addr().toBytes());
-		openFlowActions.add(ofa);
-		actionsLen += ofa.getLength();
-	    }
-
-	    if (actionSetEthernetDstAddr != null) {
-		OFActionDataLayerDestination ofa =
-		    new OFActionDataLayerDestination(actionSetEthernetDstAddr.addr().toBytes());
-		openFlowActions.add(ofa);
-		actionsLen += ofa.getLength();
-	    }
-
-	    if (actionSetIPv4SrcAddr != null) {
-		OFActionNetworkLayerSource ofa =
-		    new OFActionNetworkLayerSource(actionSetIPv4SrcAddr.addr().value());
-		openFlowActions.add(ofa);
-		actionsLen += ofa.getLength();
-	    }
-
-	    if (actionSetIPv4DstAddr != null) {
-		OFActionNetworkLayerDestination ofa =
-		    new OFActionNetworkLayerDestination(actionSetIPv4DstAddr.addr().value());
-		openFlowActions.add(ofa);
-		actionsLen += ofa.getLength();
-	    }
-
-	    if (actionSetIpToS != null) {
-		OFActionNetworkTypeOfService ofa =
-		    new OFActionNetworkTypeOfService(actionSetIpToS.ipToS());
-		openFlowActions.add(ofa);
-		actionsLen += ofa.getLength();
-	    }
-
-	    if (actionSetTcpUdpSrcPort != null) {
-		OFActionTransportLayerSource ofa =
-		    new OFActionTransportLayerSource(actionSetTcpUdpSrcPort.port());
-		openFlowActions.add(ofa);
-		actionsLen += ofa.getLength();
-	    }
-
-	    if (actionSetTcpUdpDstPort != null) {
-		OFActionTransportLayerDestination ofa =
-		    new OFActionTransportLayerDestination(actionSetTcpUdpDstPort.port());
-		openFlowActions.add(ofa);
-		actionsLen += ofa.getLength();
-	    }
-
-	    if (actionEnqueue != null) {
-		OFActionEnqueue ofa =
-		    new OFActionEnqueue(actionEnqueue.port().value(),
-					actionEnqueue.queueId());
-		openFlowActions.add(ofa);
-		actionsLen += ofa.getLength();
-	    }
-	}
-
-	fm.setIdleTimeout(FLOWMOD_DEFAULT_IDLE_TIMEOUT)
-	    .setHardTimeout(FLOWMOD_DEFAULT_HARD_TIMEOUT)
-	    .setPriority(PRIORITY_DEFAULT)
-	    .setBufferId(OFPacketOut.BUFFER_ID_NONE)
-	    .setCookie(cookie)
-	    .setCommand(flowModCommand)
-	    .setMatch(match)
-	    .setActions(openFlowActions)
-	    .setLengthU(OFFlowMod.MINIMUM_LENGTH + actionsLen);
-	fm.setOutPort(OFPort.OFPP_NONE.getValue());
-	if ((flowModCommand == OFFlowMod.OFPFC_DELETE) ||
-	    (flowModCommand == OFFlowMod.OFPFC_DELETE_STRICT)) {
-	    if (actionOutputPort != null)
-		fm.setOutPort(actionOutputPort);
-	}
-
-	//
-	// TODO: Set the following flag
-	// fm.setFlags(OFFlowMod.OFPFF_SEND_FLOW_REM);
-	// See method ForwardingBase::pushRoute()
-	//
-
-	//
-	// Write the message to the switch
-	//
-	log.debug("MEASUREMENT: Installing flow entry " + userState +
-		  " into switch DPID: " +
-		  mySwitch.getStringId() +
-		  " flowEntryId: " + flowEntryId.toString() +
-		  " srcMac: " + matchSrcMac + " dstMac: " + matchDstMac +
-		  " inPort: " + matchInPort + " outPort: " + actionOutputPort
-		  );
-	try {
-	    messageDamper.write(mySwitch, fm, null);
-	    mySwitch.flush();
-	    //
-	    // TODO: We should use the OpenFlow Barrier mechanism
-	    // to check for errors, and update the SwitchState
-	    // for a flow entry after the Barrier message is
-	    // is received.
-	    //
-	    flowEntryObj.setSwitchState("FE_SWITCH_UPDATED");
-	} catch (IOException e) {
-	    log.error("Failure writing flow mod from network map", e);
-	    return false;
-	}
-
-	return true;
-    }
-
-    /**
-     * Install a Flow Entry on a switch.
-     *
-     * @param messageFactory the OpenFlow message factory to use.
-     * @maram messageDamper the OpenFlow message damper to use.
-     * @param mySwitch the switch to install the Flow Entry into.
-     * @param flowPath the flow path for the flow entry to install.
-     * @param flowEntry the flow entry to install.
-     * @return true on success, otherwise false.
-     */
-    static boolean installFlowEntry(BasicFactory messageFactory,
-				    OFMessageDamper messageDamper,
-				    IOFSwitch mySwitch, FlowPath flowPath,
-				    FlowEntry flowEntry) {
-	//
-	// Create the OpenFlow Flow Modification Entry to push
-	//
-	OFFlowMod fm = (OFFlowMod)messageFactory.getMessage(OFType.FLOW_MOD);
-	long cookie = flowEntry.flowEntryId().value();
-
-	short flowModCommand = OFFlowMod.OFPFC_ADD;
-	if (flowEntry.flowEntryUserState() == FlowEntryUserState.FE_USER_ADD) {
-	    flowModCommand = OFFlowMod.OFPFC_ADD;
-	} else if (flowEntry.flowEntryUserState() == FlowEntryUserState.FE_USER_MODIFY) {
-	    flowModCommand = OFFlowMod.OFPFC_MODIFY_STRICT;
-	} else if (flowEntry.flowEntryUserState() == FlowEntryUserState.FE_USER_DELETE) {
-	    flowModCommand = OFFlowMod.OFPFC_DELETE_STRICT;
-	} else {
-	    // Unknown user state. Ignore the entry
-	    log.debug("Flow Entry ignored (FlowEntryId = {}): unknown user state {}",
-		      flowEntry.flowEntryId().toString(),
-		      flowEntry.flowEntryUserState());
-	    return false;
-	}
-
-	//
-	// Fetch the match conditions.
-	//
-	// NOTE: The Flow matching conditions common for all Flow Entries are
-	// used ONLY if a Flow Entry does NOT have the corresponding matching
-	// condition set.
-	//
-	OFMatch match = new OFMatch();
-	match.setWildcards(OFMatch.OFPFW_ALL);
-	FlowEntryMatch flowPathMatch = flowPath.flowEntryMatch();
-	FlowEntryMatch flowEntryMatch = flowEntry.flowEntryMatch();
-
-	// Match the Incoming Port
-	Port matchInPort = flowEntryMatch.inPort();
-	if (matchInPort != null) {
-	    match.setInputPort(matchInPort.value());
-	    match.setWildcards(match.getWildcards() & ~OFMatch.OFPFW_IN_PORT);
-	}
-
-	// Match the Source MAC address
-	MACAddress matchSrcMac = flowEntryMatch.srcMac();
-	if ((matchSrcMac == null) && (flowPathMatch != null)) {
-	    matchSrcMac = flowPathMatch.srcMac();
-	}
-	if (matchSrcMac != null) {
-	    match.setDataLayerSource(matchSrcMac.toString());
-	    match.setWildcards(match.getWildcards() & ~OFMatch.OFPFW_DL_SRC);
-	}
-
-	// Match the Destination MAC address
-	MACAddress matchDstMac = flowEntryMatch.dstMac();
-	if ((matchDstMac == null) && (flowPathMatch != null)) {
-	    matchDstMac = flowPathMatch.dstMac();
-	}
-	if (matchDstMac != null) {
-	    match.setDataLayerDestination(matchDstMac.toString());
-	    match.setWildcards(match.getWildcards() & ~OFMatch.OFPFW_DL_DST);
-	}
-
-	// Match the Ethernet Frame Type
-	Short matchEthernetFrameType = flowEntryMatch.ethernetFrameType();
-	if ((matchEthernetFrameType == null) && (flowPathMatch != null)) {
-	    matchEthernetFrameType = flowPathMatch.ethernetFrameType();
-	}
-	if (matchEthernetFrameType != null) {
-	    match.setDataLayerType(matchEthernetFrameType);
-	    match.setWildcards(match.getWildcards() & ~OFMatch.OFPFW_DL_TYPE);
-	}
-
-	// Match the VLAN ID
-	Short matchVlanId = flowEntryMatch.vlanId();
-	if ((matchVlanId == null) && (flowPathMatch != null)) {
-	    matchVlanId = flowPathMatch.vlanId();
-	}
-	if (matchVlanId != null) {
-	    match.setDataLayerVirtualLan(matchVlanId);
-	    match.setWildcards(match.getWildcards() & ~OFMatch.OFPFW_DL_VLAN);
-	}
-
-	// Match the VLAN priority
-	Byte matchVlanPriority = flowEntryMatch.vlanPriority();
-	if ((matchVlanPriority == null) && (flowPathMatch != null)) {
-	    matchVlanPriority = flowPathMatch.vlanPriority();
-	}
-	if (matchVlanPriority != null) {
-	    match.setDataLayerVirtualLanPriorityCodePoint(matchVlanPriority);
-	    match.setWildcards(match.getWildcards() & ~OFMatch.OFPFW_DL_VLAN_PCP);
-	}
-
-	// Match the Source IPv4 Network prefix
-	IPv4Net matchSrcIPv4Net = flowEntryMatch.srcIPv4Net();
-	if ((matchSrcIPv4Net == null) && (flowPathMatch != null)) {
-	    matchSrcIPv4Net = flowPathMatch.srcIPv4Net();
-	}
-	if (matchSrcIPv4Net != null) {
-	    match.setFromCIDR(matchSrcIPv4Net.toString(), OFMatch.STR_NW_SRC);
-	}
-
-	// Natch the Destination IPv4 Network prefix
-	IPv4Net matchDstIPv4Net = flowEntryMatch.dstIPv4Net();
-	if ((matchDstIPv4Net == null) && (flowPathMatch != null)) {
-	    matchDstIPv4Net = flowPathMatch.dstIPv4Net();
-	}
-	if (matchDstIPv4Net != null) {
-	    match.setFromCIDR(matchDstIPv4Net.toString(), OFMatch.STR_NW_DST);
-	}
-
-	// Match the IP protocol
-	Byte matchIpProto = flowEntryMatch.ipProto();
-	if ((matchIpProto == null) && (flowPathMatch != null)) {
-	    matchIpProto = flowPathMatch.ipProto();
-	}
-	if (matchIpProto != null) {
-	    match.setNetworkProtocol(matchIpProto);
-	    match.setWildcards(match.getWildcards() & ~OFMatch.OFPFW_NW_PROTO);
-	}
-
-	// Match the IP ToS (DSCP field, 6 bits)
-	Byte matchIpToS = flowEntryMatch.ipToS();
-	if ((matchIpToS == null) && (flowPathMatch != null)) {
-	    matchIpToS = flowPathMatch.ipToS();
-	}
-	if (matchIpToS != null) {
-	    match.setNetworkTypeOfService(matchIpToS);
-	    match.setWildcards(match.getWildcards() & ~OFMatch.OFPFW_NW_TOS);
-	}
-
-	// Match the Source TCP/UDP port
-	Short matchSrcTcpUdpPort = flowEntryMatch.srcTcpUdpPort();
-	if ((matchSrcTcpUdpPort == null) && (flowPathMatch != null)) {
-	    matchSrcTcpUdpPort = flowPathMatch.srcTcpUdpPort();
-	}
-	if (matchSrcTcpUdpPort != null) {
-	    match.setTransportSource(matchSrcTcpUdpPort);
-	    match.setWildcards(match.getWildcards() & ~OFMatch.OFPFW_TP_SRC);
-	}
-
-	// Match the Destination TCP/UDP port
-	Short matchDstTcpUdpPort = flowEntryMatch.dstTcpUdpPort();
-	if ((matchDstTcpUdpPort == null) && (flowPathMatch != null)) {
-	    matchDstTcpUdpPort = flowPathMatch.dstTcpUdpPort();
-	}
-	if (matchDstTcpUdpPort != null) {
-	    match.setTransportDestination(matchDstTcpUdpPort);
-	    match.setWildcards(match.getWildcards() & ~OFMatch.OFPFW_TP_DST);
-	}
-
-	//
-	// Fetch the actions
-	//
-	Short actionOutputPort = null;
-	List<OFAction> openFlowActions = new ArrayList<OFAction>();
-	int actionsLen = 0;
-	FlowEntryActions flowEntryActions = flowEntry.flowEntryActions();
-	//
-	for (FlowEntryAction action : flowEntryActions.actions()) {
-	    ActionOutput actionOutput = action.actionOutput();
-	    ActionSetVlanId actionSetVlanId = action.actionSetVlanId();
-	    ActionSetVlanPriority actionSetVlanPriority = action.actionSetVlanPriority();
-	    ActionStripVlan actionStripVlan = action.actionStripVlan();
-	    ActionSetEthernetAddr actionSetEthernetSrcAddr = action.actionSetEthernetSrcAddr();
-	    ActionSetEthernetAddr actionSetEthernetDstAddr = action.actionSetEthernetDstAddr();
-	    ActionSetIPv4Addr actionSetIPv4SrcAddr = action.actionSetIPv4SrcAddr();
-	    ActionSetIPv4Addr actionSetIPv4DstAddr = action.actionSetIPv4DstAddr();
-	    ActionSetIpToS actionSetIpToS = action.actionSetIpToS();
-	    ActionSetTcpUdpPort actionSetTcpUdpSrcPort = action.actionSetTcpUdpSrcPort();
-	    ActionSetTcpUdpPort actionSetTcpUdpDstPort = action.actionSetTcpUdpDstPort();
-	    ActionEnqueue actionEnqueue = action.actionEnqueue();
-
-	    if (actionOutput != null) {
-		actionOutputPort = actionOutput.port().value();
-		// XXX: The max length is hard-coded for now
-		OFActionOutput ofa =
-		    new OFActionOutput(actionOutput.port().value(),
-				       (short)0xffff);
-		openFlowActions.add(ofa);
-		actionsLen += ofa.getLength();
-	    }
-
-	    if (actionSetVlanId != null) {
-		OFActionVirtualLanIdentifier ofa =
-		    new OFActionVirtualLanIdentifier(actionSetVlanId.vlanId());
-		openFlowActions.add(ofa);
-		actionsLen += ofa.getLength();
-	    }
-
-	    if (actionSetVlanPriority != null) {
-		OFActionVirtualLanPriorityCodePoint ofa =
-		    new OFActionVirtualLanPriorityCodePoint(actionSetVlanPriority.vlanPriority());
-		openFlowActions.add(ofa);
-		actionsLen += ofa.getLength();
-	    }
-
-	    if (actionStripVlan != null) {
-		if (actionStripVlan.stripVlan() == true) {
-		    OFActionStripVirtualLan ofa = new OFActionStripVirtualLan();
-		    openFlowActions.add(ofa);
-		    actionsLen += ofa.getLength();
-		}
-	    }
-
-	    if (actionSetEthernetSrcAddr != null) {
-		OFActionDataLayerSource ofa = 
-		    new OFActionDataLayerSource(actionSetEthernetSrcAddr.addr().toBytes());
-		openFlowActions.add(ofa);
-		actionsLen += ofa.getLength();
-	    }
-
-	    if (actionSetEthernetDstAddr != null) {
-		OFActionDataLayerDestination ofa =
-		    new OFActionDataLayerDestination(actionSetEthernetDstAddr.addr().toBytes());
-		openFlowActions.add(ofa);
-		actionsLen += ofa.getLength();
-	    }
-
-	    if (actionSetIPv4SrcAddr != null) {
-		OFActionNetworkLayerSource ofa =
-		    new OFActionNetworkLayerSource(actionSetIPv4SrcAddr.addr().value());
-		openFlowActions.add(ofa);
-		actionsLen += ofa.getLength();
-	    }
-
-	    if (actionSetIPv4DstAddr != null) {
-		OFActionNetworkLayerDestination ofa =
-		    new OFActionNetworkLayerDestination(actionSetIPv4DstAddr.addr().value());
-		openFlowActions.add(ofa);
-		actionsLen += ofa.getLength();
-	    }
-
-	    if (actionSetIpToS != null) {
-		OFActionNetworkTypeOfService ofa =
-		    new OFActionNetworkTypeOfService(actionSetIpToS.ipToS());
-		openFlowActions.add(ofa);
-		actionsLen += ofa.getLength();
-	    }
-
-	    if (actionSetTcpUdpSrcPort != null) {
-		OFActionTransportLayerSource ofa =
-		    new OFActionTransportLayerSource(actionSetTcpUdpSrcPort.port());
-		openFlowActions.add(ofa);
-		actionsLen += ofa.getLength();
-	    }
-
-	    if (actionSetTcpUdpDstPort != null) {
-		OFActionTransportLayerDestination ofa =
-		    new OFActionTransportLayerDestination(actionSetTcpUdpDstPort.port());
-		openFlowActions.add(ofa);
-		actionsLen += ofa.getLength();
-	    }
-
-	    if (actionEnqueue != null) {
-		OFActionEnqueue ofa =
-		    new OFActionEnqueue(actionEnqueue.port().value(),
-					actionEnqueue.queueId());
-		openFlowActions.add(ofa);
-		actionsLen += ofa.getLength();
-	    }
-	}
-
-	fm.setIdleTimeout(FLOWMOD_DEFAULT_IDLE_TIMEOUT)
-	    .setHardTimeout(FLOWMOD_DEFAULT_HARD_TIMEOUT)
-	    .setPriority(PRIORITY_DEFAULT)
-	    .setBufferId(OFPacketOut.BUFFER_ID_NONE)
-	    .setCookie(cookie)
-	    .setCommand(flowModCommand)
-	    .setMatch(match)
-	    .setActions(openFlowActions)
-	    .setLengthU(OFFlowMod.MINIMUM_LENGTH + actionsLen);
-	fm.setOutPort(OFPort.OFPP_NONE.getValue());
-	if ((flowModCommand == OFFlowMod.OFPFC_DELETE) ||
-	    (flowModCommand == OFFlowMod.OFPFC_DELETE_STRICT)) {
-	    if (actionOutputPort != null)
-		fm.setOutPort(actionOutputPort);
-	}
-
-	//
-	// TODO: Set the following flag
-	// fm.setFlags(OFFlowMod.OFPFF_SEND_FLOW_REM);
-	// See method ForwardingBase::pushRoute()
-	//
-
-	//
-	// Write the message to the switch
-	//
-	log.debug("MEASUREMENT: Installing flow entry " +
-		  flowEntry.flowEntryUserState() +
-		  " into switch DPID: " +
-		  mySwitch.getStringId() +
-		  " flowEntryId: " + flowEntry.flowEntryId().toString() +
-		  " srcMac: " + matchSrcMac + " dstMac: " + matchDstMac +
-		  " inPort: " + matchInPort + " outPort: " + actionOutputPort
-		  );
-	try {
-	    messageDamper.write(mySwitch, fm, null);
-	    mySwitch.flush();
-	    //
-	    // TODO: We should use the OpenFlow Barrier mechanism
-	    // to check for errors, and update the SwitchState
-	    // for a flow entry after the Barrier message is
-	    // is received.
-	    //
-	    // TODO: The FlowEntry Object in Titan should be set
-	    // to FE_SWITCH_UPDATED.
-	    //
-	} catch (IOException e) {
-	    log.error("Failure writing flow mod from network map", e);
-	    return false;
-	}
-	return true;
-    }
-}
diff --git a/src/main/java/net/onrc/onos/ofcontroller/flowprogrammer/FlowPusher.java b/src/main/java/net/onrc/onos/ofcontroller/flowprogrammer/FlowPusher.java
index 8b3d47c..438f478 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/flowprogrammer/FlowPusher.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/flowprogrammer/FlowPusher.java
@@ -27,8 +27,6 @@
 import net.floodlightcontroller.threadpool.IThreadPoolService;
 import net.floodlightcontroller.util.MACAddress;
 import net.floodlightcontroller.util.OFMessageDamper;
-import net.onrc.onos.ofcontroller.core.INetMapTopologyObjects.IFlowEntry;
-import net.onrc.onos.ofcontroller.core.INetMapTopologyObjects.IFlowPath;
 import net.onrc.onos.ofcontroller.util.FlowEntryAction;
 import net.onrc.onos.ofcontroller.util.FlowEntryAction.*;
 import net.onrc.onos.ofcontroller.util.FlowEntry;
@@ -36,7 +34,6 @@
 import net.onrc.onos.ofcontroller.util.FlowEntryId;
 import net.onrc.onos.ofcontroller.util.FlowEntryMatch;
 import net.onrc.onos.ofcontroller.util.FlowEntryUserState;
-import net.onrc.onos.ofcontroller.util.FlowPath;
 import net.onrc.onos.ofcontroller.util.IPv4Net;
 import net.onrc.onos.ofcontroller.util.Port;
 
@@ -157,7 +154,7 @@
 					// wait for message pushed to queue
 					mutex.acquire();
 				} catch (InterruptedException e) {
-					e.printStackTrace();
+					// not an error
 					log.debug("FlowPusherThread is interrupted");
 					return;
 				}
@@ -224,7 +221,7 @@
 					OFMessage msg = queue.poll();
 					try {
 						messageDamper.write(sw, msg, context);
-						log.debug("Pusher sends message : {}", msg);
+//						log.debug("Pusher sends message : {}", msg);
 						size += msg.getLength();
 					} catch (IOException e) {
 						e.printStackTrace();
@@ -437,7 +434,7 @@
 		
 		synchronized (queue) {
 			queue.add(msg);
-			log.debug("Message is pushed : {}", msg);
+//			log.debug("Message is pushed : {}", msg);
 		}
 		
 		if (proc.mutex.availablePermits() == 0) {
@@ -448,312 +445,7 @@
 	}
 	
 	@Override
-	public boolean add(IOFSwitch sw, IFlowPath flowObj, IFlowEntry flowEntryObj) {
-		log.debug("sending : {}, {}", sw, flowObj);
-		String flowEntryIdStr = flowEntryObj.getFlowEntryId();
-		if (flowEntryIdStr == null)
-		    return false;
-		FlowEntryId flowEntryId = new FlowEntryId(flowEntryIdStr);
-		String userState = flowEntryObj.getUserState();
-		if (userState == null)
-		    return false;
-
-		//
-		// Create the Open Flow Flow Modification Entry to push
-		//
-		OFFlowMod fm = (OFFlowMod)factory.getMessage(OFType.FLOW_MOD);
-		long cookie = flowEntryId.value();
-
-		short flowModCommand = OFFlowMod.OFPFC_ADD;
-		if (userState.equals("FE_USER_ADD")) {
-		    flowModCommand = OFFlowMod.OFPFC_ADD;
-		} else if (userState.equals("FE_USER_MODIFY")) {
-		    flowModCommand = OFFlowMod.OFPFC_MODIFY_STRICT;
-		} else if (userState.equals("FE_USER_DELETE")) {
-		    flowModCommand = OFFlowMod.OFPFC_DELETE_STRICT;
-		} else {
-		    // Unknown user state. Ignore the entry
-		    log.debug("Flow Entry ignored (FlowEntryId = {}): unknown user state {}",
-			      flowEntryId.toString(), userState);
-		    return false;
-		}
-
-		//
-		// Fetch the match conditions.
-		//
-		// NOTE: The Flow matching conditions common for all Flow Entries are
-		// used ONLY if a Flow Entry does NOT have the corresponding matching
-		// condition set.
-		//
-		OFMatch match = new OFMatch();
-		match.setWildcards(OFMatch.OFPFW_ALL);
-
-		// Match the Incoming Port
-		Short matchInPort = flowEntryObj.getMatchInPort();
-		if (matchInPort != null) {
-		    match.setInputPort(matchInPort);
-		    match.setWildcards(match.getWildcards() & ~OFMatch.OFPFW_IN_PORT);
-		}
-
-		// Match the Source MAC address
-		String matchSrcMac = flowEntryObj.getMatchSrcMac();
-		if (matchSrcMac == null)
-		    matchSrcMac = flowObj.getMatchSrcMac();
-		if (matchSrcMac != null) {
-		    match.setDataLayerSource(matchSrcMac);
-		    match.setWildcards(match.getWildcards() & ~OFMatch.OFPFW_DL_SRC);
-		}
-
-		// Match the Destination MAC address
-		String matchDstMac = flowEntryObj.getMatchDstMac();
-		if (matchDstMac == null)
-		    matchDstMac = flowObj.getMatchDstMac();
-		if (matchDstMac != null) {
-		    match.setDataLayerDestination(matchDstMac);
-		    match.setWildcards(match.getWildcards() & ~OFMatch.OFPFW_DL_DST);
-		}
-
-		// Match the Ethernet Frame Type
-		Short matchEthernetFrameType = flowEntryObj.getMatchEthernetFrameType();
-		if (matchEthernetFrameType == null)
-		    matchEthernetFrameType = flowObj.getMatchEthernetFrameType();
-		if (matchEthernetFrameType != null) {
-		    match.setDataLayerType(matchEthernetFrameType);
-		    match.setWildcards(match.getWildcards() & ~OFMatch.OFPFW_DL_TYPE);
-		}
-
-		// Match the VLAN ID
-		Short matchVlanId = flowEntryObj.getMatchVlanId();
-		if (matchVlanId == null)
-		    matchVlanId = flowObj.getMatchVlanId();
-		if (matchVlanId != null) {
-		    match.setDataLayerVirtualLan(matchVlanId);
-		    match.setWildcards(match.getWildcards() & ~OFMatch.OFPFW_DL_VLAN);
-		}
-
-		// Match the VLAN priority
-		Byte matchVlanPriority = flowEntryObj.getMatchVlanPriority();
-		if (matchVlanPriority == null)
-		    matchVlanPriority = flowObj.getMatchVlanPriority();
-		if (matchVlanPriority != null) {
-		    match.setDataLayerVirtualLanPriorityCodePoint(matchVlanPriority);
-		    match.setWildcards(match.getWildcards() & ~OFMatch.OFPFW_DL_VLAN_PCP);
-		}
-
-		// Match the Source IPv4 Network prefix
-		String matchSrcIPv4Net = flowEntryObj.getMatchSrcIPv4Net();
-		if (matchSrcIPv4Net == null)
-		    matchSrcIPv4Net = flowObj.getMatchSrcIPv4Net();
-		if (matchSrcIPv4Net != null) {
-		    match.setFromCIDR(matchSrcIPv4Net, OFMatch.STR_NW_SRC);
-		}
-
-		// Match the Destination IPv4 Network prefix
-		String matchDstIPv4Net = flowEntryObj.getMatchDstIPv4Net();
-		if (matchDstIPv4Net == null)
-		    matchDstIPv4Net = flowObj.getMatchDstIPv4Net();
-		if (matchDstIPv4Net != null) {
-		    match.setFromCIDR(matchDstIPv4Net, OFMatch.STR_NW_DST);
-		}
-
-		// Match the IP protocol
-		Byte matchIpProto = flowEntryObj.getMatchIpProto();
-		if (matchIpProto == null)
-		    matchIpProto = flowObj.getMatchIpProto();
-		if (matchIpProto != null) {
-		    match.setNetworkProtocol(matchIpProto);
-		    match.setWildcards(match.getWildcards() & ~OFMatch.OFPFW_NW_PROTO);
-		}
-
-		// Match the IP ToS (DSCP field, 6 bits)
-		Byte matchIpToS = flowEntryObj.getMatchIpToS();
-		if (matchIpToS == null)
-		    matchIpToS = flowObj.getMatchIpToS();
-		if (matchIpToS != null) {
-		    match.setNetworkTypeOfService(matchIpToS);
-		    match.setWildcards(match.getWildcards() & ~OFMatch.OFPFW_NW_TOS);
-		}
-
-		// Match the Source TCP/UDP port
-		Short matchSrcTcpUdpPort = flowEntryObj.getMatchSrcTcpUdpPort();
-		if (matchSrcTcpUdpPort == null)
-		    matchSrcTcpUdpPort = flowObj.getMatchSrcTcpUdpPort();
-		if (matchSrcTcpUdpPort != null) {
-		    match.setTransportSource(matchSrcTcpUdpPort);
-		    match.setWildcards(match.getWildcards() & ~OFMatch.OFPFW_TP_SRC);
-		}
-
-		// Match the Destination TCP/UDP port
-		Short matchDstTcpUdpPort = flowEntryObj.getMatchDstTcpUdpPort();
-		if (matchDstTcpUdpPort == null)
-		    matchDstTcpUdpPort = flowObj.getMatchDstTcpUdpPort();
-		if (matchDstTcpUdpPort != null) {
-		    match.setTransportDestination(matchDstTcpUdpPort);
-		    match.setWildcards(match.getWildcards() & ~OFMatch.OFPFW_TP_DST);
-		}
-
-		//
-		// Fetch the actions
-		//
-		Short actionOutputPort = null;
-		List<OFAction> openFlowActions = new ArrayList<OFAction>();
-		int actionsLen = 0;
-		FlowEntryActions flowEntryActions = null;
-		String actionsStr = flowEntryObj.getActions();
-		if (actionsStr != null)
-		    flowEntryActions = new FlowEntryActions(actionsStr);
-		else
-		    flowEntryActions = new FlowEntryActions();
-		for (FlowEntryAction action : flowEntryActions.actions()) {
-		    ActionOutput actionOutput = action.actionOutput();
-		    ActionSetVlanId actionSetVlanId = action.actionSetVlanId();
-		    ActionSetVlanPriority actionSetVlanPriority = action.actionSetVlanPriority();
-		    ActionStripVlan actionStripVlan = action.actionStripVlan();
-		    ActionSetEthernetAddr actionSetEthernetSrcAddr = action.actionSetEthernetSrcAddr();
-		    ActionSetEthernetAddr actionSetEthernetDstAddr = action.actionSetEthernetDstAddr();
-		    ActionSetIPv4Addr actionSetIPv4SrcAddr = action.actionSetIPv4SrcAddr();
-		    ActionSetIPv4Addr actionSetIPv4DstAddr = action.actionSetIPv4DstAddr();
-		    ActionSetIpToS actionSetIpToS = action.actionSetIpToS();
-		    ActionSetTcpUdpPort actionSetTcpUdpSrcPort = action.actionSetTcpUdpSrcPort();
-		    ActionSetTcpUdpPort actionSetTcpUdpDstPort = action.actionSetTcpUdpDstPort();
-		    ActionEnqueue actionEnqueue = action.actionEnqueue();
-
-		    if (actionOutput != null) {
-				actionOutputPort = actionOutput.port().value();
-				// XXX: The max length is hard-coded for now
-				OFActionOutput ofa =
-				    new OFActionOutput(actionOutput.port().value(),
-						       (short)0xffff);
-				openFlowActions.add(ofa);
-				actionsLen += ofa.getLength();
-		    }
-
-		    if (actionSetVlanId != null) {
-				OFActionVirtualLanIdentifier ofa =
-				    new OFActionVirtualLanIdentifier(actionSetVlanId.vlanId());
-				openFlowActions.add(ofa);
-				actionsLen += ofa.getLength();
-		    }
-
-		    if (actionSetVlanPriority != null) {
-				OFActionVirtualLanPriorityCodePoint ofa =
-				    new OFActionVirtualLanPriorityCodePoint(actionSetVlanPriority.vlanPriority());
-				openFlowActions.add(ofa);
-				actionsLen += ofa.getLength();
-		    }
-
-		    if (actionStripVlan != null) {
-				if (actionStripVlan.stripVlan() == true) {
-				    OFActionStripVirtualLan ofa = new OFActionStripVirtualLan();
-				    openFlowActions.add(ofa);
-				    actionsLen += ofa.getLength();
-				}
-		    }
-
-		    if (actionSetEthernetSrcAddr != null) {
-				OFActionDataLayerSource ofa = 
-				    new OFActionDataLayerSource(actionSetEthernetSrcAddr.addr().toBytes());
-				openFlowActions.add(ofa);
-				actionsLen += ofa.getLength();
-		    }
-
-		    if (actionSetEthernetDstAddr != null) {
-				OFActionDataLayerDestination ofa =
-				    new OFActionDataLayerDestination(actionSetEthernetDstAddr.addr().toBytes());
-				openFlowActions.add(ofa);
-				actionsLen += ofa.getLength();
-		    }
-
-		    if (actionSetIPv4SrcAddr != null) {
-				OFActionNetworkLayerSource ofa =
-				    new OFActionNetworkLayerSource(actionSetIPv4SrcAddr.addr().value());
-				openFlowActions.add(ofa);
-				actionsLen += ofa.getLength();
-		    }
-
-		    if (actionSetIPv4DstAddr != null) {
-				OFActionNetworkLayerDestination ofa =
-				    new OFActionNetworkLayerDestination(actionSetIPv4DstAddr.addr().value());
-				openFlowActions.add(ofa);
-				actionsLen += ofa.getLength();
-		    }
-
-		    if (actionSetIpToS != null) {
-				OFActionNetworkTypeOfService ofa =
-				    new OFActionNetworkTypeOfService(actionSetIpToS.ipToS());
-				openFlowActions.add(ofa);
-				actionsLen += ofa.getLength();
-		    }
-
-		    if (actionSetTcpUdpSrcPort != null) {
-				OFActionTransportLayerSource ofa =
-				    new OFActionTransportLayerSource(actionSetTcpUdpSrcPort.port());
-				openFlowActions.add(ofa);
-				actionsLen += ofa.getLength();
-		    }
-
-		    if (actionSetTcpUdpDstPort != null) {
-				OFActionTransportLayerDestination ofa =
-				    new OFActionTransportLayerDestination(actionSetTcpUdpDstPort.port());
-				openFlowActions.add(ofa);
-				actionsLen += ofa.getLength();
-		    }
-
-		    if (actionEnqueue != null) {
-				OFActionEnqueue ofa =
-				    new OFActionEnqueue(actionEnqueue.port().value(),
-							actionEnqueue.queueId());
-				openFlowActions.add(ofa);
-				actionsLen += ofa.getLength();
-		    }
-		}
-
-		fm.setIdleTimeout(FLOWMOD_DEFAULT_IDLE_TIMEOUT)
-		    .setHardTimeout(FLOWMOD_DEFAULT_HARD_TIMEOUT)
-		    .setPriority(PRIORITY_DEFAULT)
-		    .setBufferId(OFPacketOut.BUFFER_ID_NONE)
-		    .setCookie(cookie)
-		    .setCommand(flowModCommand)
-		    .setMatch(match)
-		    .setActions(openFlowActions)
-		    .setLengthU(OFFlowMod.MINIMUM_LENGTH + actionsLen);
-		fm.setOutPort(OFPort.OFPP_NONE.getValue());
-		if ((flowModCommand == OFFlowMod.OFPFC_DELETE) ||
-		    (flowModCommand == OFFlowMod.OFPFC_DELETE_STRICT)) {
-		    if (actionOutputPort != null)
-			fm.setOutPort(actionOutputPort);
-		}
-
-		//
-		// TODO: Set the following flag
-		// fm.setFlags(OFFlowMod.OFPFF_SEND_FLOW_REM);
-		// See method ForwardingBase::pushRoute()
-		//
-
-		//
-		// Write the message to the switch
-		//
-		log.debug("MEASUREMENT: Installing flow entry " + userState +
-			  " into switch DPID: " +
-			  sw.getStringId() +
-			  " flowEntryId: " + flowEntryId.toString() +
-			  " srcMac: " + matchSrcMac + " dstMac: " + matchDstMac +
-			  " inPort: " + matchInPort + " outPort: " + actionOutputPort
-			  );
-		add(sw,fm);
-	    //
-	    // TODO: We should use the OpenFlow Barrier mechanism
-	    // to check for errors, and update the SwitchState
-	    // for a flow entry after the Barrier message is
-	    // is received.
-	    //
-	    flowEntryObj.setSwitchState("FE_SWITCH_UPDATED");
-
-		return true;
-	}
-	
-	@Override
-	public boolean add(IOFSwitch sw, FlowPath flowPath, FlowEntry flowEntry) {
+	public boolean add(IOFSwitch sw, FlowEntry flowEntry) {
 		//
 		// Create the OpenFlow Flow Modification Entry to push
 		//
@@ -785,7 +477,6 @@
 		//
 		OFMatch match = new OFMatch();
 		match.setWildcards(OFMatch.OFPFW_ALL);
-		FlowEntryMatch flowPathMatch = flowPath.flowEntryMatch();
 		FlowEntryMatch flowEntryMatch = flowEntry.flowEntryMatch();
 
 		// Match the Incoming Port
@@ -797,9 +488,6 @@
 
 		// Match the Source MAC address
 		MACAddress matchSrcMac = flowEntryMatch.srcMac();
-		if ((matchSrcMac == null) && (flowPathMatch != null)) {
-			matchSrcMac = flowPathMatch.srcMac();
-		}
 		if (matchSrcMac != null) {
 			match.setDataLayerSource(matchSrcMac.toString());
 			match.setWildcards(match.getWildcards() & ~OFMatch.OFPFW_DL_SRC);
@@ -807,9 +495,6 @@
 
 		// Match the Destination MAC address
 		MACAddress matchDstMac = flowEntryMatch.dstMac();
-		if ((matchDstMac == null) && (flowPathMatch != null)) {
-			matchDstMac = flowPathMatch.dstMac();
-		}
 		if (matchDstMac != null) {
 			match.setDataLayerDestination(matchDstMac.toString());
 			match.setWildcards(match.getWildcards() & ~OFMatch.OFPFW_DL_DST);
@@ -817,9 +502,6 @@
 
 		// Match the Ethernet Frame Type
 		Short matchEthernetFrameType = flowEntryMatch.ethernetFrameType();
-		if ((matchEthernetFrameType == null) && (flowPathMatch != null)) {
-			matchEthernetFrameType = flowPathMatch.ethernetFrameType();
-		}
 		if (matchEthernetFrameType != null) {
 			match.setDataLayerType(matchEthernetFrameType);
 			match.setWildcards(match.getWildcards() & ~OFMatch.OFPFW_DL_TYPE);
@@ -827,9 +509,6 @@
 
 		// Match the VLAN ID
 		Short matchVlanId = flowEntryMatch.vlanId();
-		if ((matchVlanId == null) && (flowPathMatch != null)) {
-			matchVlanId = flowPathMatch.vlanId();
-		}
 		if (matchVlanId != null) {
 			match.setDataLayerVirtualLan(matchVlanId);
 			match.setWildcards(match.getWildcards() & ~OFMatch.OFPFW_DL_VLAN);
@@ -837,9 +516,6 @@
 
 		// Match the VLAN priority
 		Byte matchVlanPriority = flowEntryMatch.vlanPriority();
-		if ((matchVlanPriority == null) && (flowPathMatch != null)) {
-			matchVlanPriority = flowPathMatch.vlanPriority();
-		}
 		if (matchVlanPriority != null) {
 			match.setDataLayerVirtualLanPriorityCodePoint(matchVlanPriority);
 			match.setWildcards(match.getWildcards()
@@ -848,27 +524,18 @@
 
 		// Match the Source IPv4 Network prefix
 		IPv4Net matchSrcIPv4Net = flowEntryMatch.srcIPv4Net();
-		if ((matchSrcIPv4Net == null) && (flowPathMatch != null)) {
-			matchSrcIPv4Net = flowPathMatch.srcIPv4Net();
-		}
 		if (matchSrcIPv4Net != null) {
 			match.setFromCIDR(matchSrcIPv4Net.toString(), OFMatch.STR_NW_SRC);
 		}
 
 		// Natch the Destination IPv4 Network prefix
 		IPv4Net matchDstIPv4Net = flowEntryMatch.dstIPv4Net();
-		if ((matchDstIPv4Net == null) && (flowPathMatch != null)) {
-			matchDstIPv4Net = flowPathMatch.dstIPv4Net();
-		}
 		if (matchDstIPv4Net != null) {
 			match.setFromCIDR(matchDstIPv4Net.toString(), OFMatch.STR_NW_DST);
 		}
 
 		// Match the IP protocol
 		Byte matchIpProto = flowEntryMatch.ipProto();
-		if ((matchIpProto == null) && (flowPathMatch != null)) {
-			matchIpProto = flowPathMatch.ipProto();
-		}
 		if (matchIpProto != null) {
 			match.setNetworkProtocol(matchIpProto);
 			match.setWildcards(match.getWildcards() & ~OFMatch.OFPFW_NW_PROTO);
@@ -876,9 +543,6 @@
 
 		// Match the IP ToS (DSCP field, 6 bits)
 		Byte matchIpToS = flowEntryMatch.ipToS();
-		if ((matchIpToS == null) && (flowPathMatch != null)) {
-			matchIpToS = flowPathMatch.ipToS();
-		}
 		if (matchIpToS != null) {
 			match.setNetworkTypeOfService(matchIpToS);
 			match.setWildcards(match.getWildcards() & ~OFMatch.OFPFW_NW_TOS);
@@ -886,9 +550,6 @@
 
 		// Match the Source TCP/UDP port
 		Short matchSrcTcpUdpPort = flowEntryMatch.srcTcpUdpPort();
-		if ((matchSrcTcpUdpPort == null) && (flowPathMatch != null)) {
-			matchSrcTcpUdpPort = flowPathMatch.srcTcpUdpPort();
-		}
 		if (matchSrcTcpUdpPort != null) {
 			match.setTransportSource(matchSrcTcpUdpPort);
 			match.setWildcards(match.getWildcards() & ~OFMatch.OFPFW_TP_SRC);
@@ -896,9 +557,6 @@
 
 		// Match the Destination TCP/UDP port
 		Short matchDstTcpUdpPort = flowEntryMatch.dstTcpUdpPort();
-		if ((matchDstTcpUdpPort == null) && (flowPathMatch != null)) {
-			matchDstTcpUdpPort = flowPathMatch.dstTcpUdpPort();
-		}
 		if (matchDstTcpUdpPort != null) {
 			match.setTransportDestination(matchDstTcpUdpPort);
 			match.setWildcards(match.getWildcards() & ~OFMatch.OFPFW_TP_DST);
@@ -1044,7 +702,7 @@
 		//
 		// Write the message to the switch
 		//
-		log.debug("MEASUREMENT: Installing flow entry "
+		log.debug("Installing flow entry "
 				+ flowEntry.flowEntryUserState() + " into switch DPID: "
 				+ sw.getStringId() + " flowEntryId: "
 				+ flowEntry.flowEntryId().toString() + " srcMac: "
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 0d6b0e8..c357e7c 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/flowprogrammer/FlowSynchronizer.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/flowprogrammer/FlowSynchronizer.java
@@ -25,14 +25,16 @@
 import net.onrc.onos.graph.GraphDBOperation;
 import net.onrc.onos.ofcontroller.core.INetMapTopologyObjects.IFlowEntry;
 import net.onrc.onos.ofcontroller.core.INetMapTopologyObjects.ISwitchObject;
+import net.onrc.onos.ofcontroller.flowmanager.FlowDatabaseOperation;
 import net.onrc.onos.ofcontroller.util.Dpid;
+import net.onrc.onos.ofcontroller.util.FlowEntry;
 import net.onrc.onos.ofcontroller.util.FlowEntryId;
 
 /**
  * FlowSynchronizer is an implementation of FlowSyncService.
- * In addition to IFlowSyncService, FlowSynchronizer periodically reads flow tables from
- * switches and compare them with GraphDB to drop unnecessary flows and/or to install
- * missing flows.
+ * In addition to IFlowSyncService, FlowSynchronizer periodically reads flow
+ * tables from switches and compare them with GraphDB to drop unnecessary
+ * flows and/or to install missing flows.
  * @author Brian
  *
  */
@@ -99,7 +101,8 @@
 	}
 
 	/**
-	 * Compare flows entries in GraphDB and switch to pick up necessary messages.
+	 * Compare flows entries in GraphDB and switch to pick up necessary
+	 * messages.
 	 * After picking up, picked messages are added to FlowPusher.
 	 * @param graphEntries Flow entries in GraphDB.
 	 * @param switchEntries Flow entries in switch.
@@ -191,24 +194,22 @@
     }
 
     /**
-     * FlowEntryWrapper represents abstract FlowEntry which is embodied by IFlowEntry
-     * (from GraphDB) or OFFlowStatisticsReply (from switch).
+     * FlowEntryWrapper represents abstract FlowEntry which is embodied
+     * by FlowEntryId (from GraphDB) or OFFlowStatisticsReply (from switch).
      * @author Brian
      *
      */
     class FlowEntryWrapper {
-	FlowEntryId id;
-	IFlowEntry iflowEntry;
+	FlowEntryId flowEntryId;
 	OFFlowStatisticsReply statisticsReply;
 
 	public FlowEntryWrapper(IFlowEntry entry) {
-	    iflowEntry = entry;
-	    id = new FlowEntryId(entry.getFlowEntryId());
+	    flowEntryId = new FlowEntryId(entry.getFlowEntryId());
 	}
 
 	public FlowEntryWrapper(OFFlowStatisticsReply entry) {
+	    flowEntryId = new FlowEntryId(entry.getCookie());
 	    statisticsReply = entry;
-	    id = new FlowEntryId(entry.getCookie());
 	}
 
 	/**
@@ -216,36 +217,59 @@
 	 * @param sw Switch to which flow will be installed.
 	 */
 	public void addToSwitch(IOFSwitch sw) {
-	    if(iflowEntry != null) {
-		pusher.add(sw, iflowEntry.getFlow(), iflowEntry);
-	    }
-	    else if(statisticsReply != null) {
-		log.error("Adding existing flow entry {} to sw {}", 
+	    if (statisticsReply != null) {
+		log.error("Error adding existing flow entry {} to sw {}", 
 			  statisticsReply.getCookie(), sw.getId());
+		return;
 	    }
+
+	    // Get the Flow Entry state from the Network Graph
+	    IFlowEntry iFlowEntry = null;
+	    try {
+		iFlowEntry = dbHandler.searchFlowEntry(flowEntryId);
+	    } catch (Exception e) {
+		log.error("Error finding flow entry {} in Network Graph",
+			  flowEntryId);
+		return;
+	    }
+	    if (iFlowEntry == null) {
+		log.error("Cannot add flow entry {} to sw {} : flow entry not found",
+			  flowEntryId, sw.getId());
+		return;
+	    }
+
+	    FlowEntry flowEntry =
+		FlowDatabaseOperation.extractFlowEntry(iFlowEntry);
+	    if (flowEntry == null) {
+		log.error("Cannot add flow entry {} to sw {} : flow entry cannot be extracted",
+			  flowEntryId, sw.getId());
+		return;
+	    }
+
+	    pusher.add(sw, flowEntry);
 	}
 	
 	/**
 	 * Remove this FlowEntry from a switch via FlowPusher.
 	 * @param sw Switch from which flow will be removed.
 	 */
-	public void removeFromSwitch(IOFSwitch sw){
-	    if(iflowEntry != null) {
-		log.error("Removing non-existent flow entry {} from sw {}", 
-			  iflowEntry.getFlowEntryId(), sw.getId());
+	public void removeFromSwitch(IOFSwitch sw) {
+	    if (statisticsReply == null) {
+		log.error("Error removing non-existent flow entry {} from sw {}", 
+			  flowEntryId, sw.getId());
+		return;
+	    }
 
-	    }
-	    else if(statisticsReply != null) {
-		// Convert Statistics Reply to Flow Mod, then write it
-		OFFlowMod fm = new OFFlowMod();
-		fm.setCookie(statisticsReply.getCookie());
-		fm.setCommand(OFFlowMod.OFPFC_DELETE_STRICT);
-		fm.setLengthU(OFFlowMod.MINIMUM_LENGTH);
-		fm.setMatch(statisticsReply.getMatch());
-		fm.setPriority(statisticsReply.getPriority());
-		fm.setOutPort(OFPort.OFPP_NONE);
-		pusher.add(sw, fm);
-	    }
+	    // Convert Statistics Reply to Flow Mod, then write it
+	    OFFlowMod fm = new OFFlowMod();
+	    fm.setCookie(statisticsReply.getCookie());
+	    fm.setCommand(OFFlowMod.OFPFC_DELETE_STRICT);
+	    fm.setLengthU(OFFlowMod.MINIMUM_LENGTH);
+	    fm.setMatch(statisticsReply.getMatch());
+	    fm.setPriority(statisticsReply.getPriority());
+	    fm.setOutPort(OFPort.OFPP_NONE);
+
+	    pusher.add(sw, fm);
 	}
 
 	/**
@@ -253,7 +277,7 @@
 	 */
 	@Override
 	public int hashCode() {
-	    return id.hashCode();
+	    return flowEntryId.hashCode();
 	}
 
 	/**
@@ -268,18 +292,14 @@
 	    if(obj.getClass() == this.getClass()) {
 		FlowEntryWrapper entry = (FlowEntryWrapper) obj;
 		// TODO: we need to actually compare the match + actions
-		return this.id.equals(entry.id);
+		return this.flowEntryId.equals(entry.flowEntryId);
 	    }
 	    return false;
 	}
 
 	@Override
 	public String toString() {
-	    return id.toString();
+	    return flowEntryId.toString();
 	}
     }
-
-
 }
-
-
diff --git a/src/main/java/net/onrc/onos/ofcontroller/flowprogrammer/IFlowPusherService.java b/src/main/java/net/onrc/onos/ofcontroller/flowprogrammer/IFlowPusherService.java
index 20a6249..2f550a7 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/flowprogrammer/IFlowPusherService.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/flowprogrammer/IFlowPusherService.java
@@ -6,10 +6,7 @@
 import net.floodlightcontroller.core.IOFSwitch;
 import net.floodlightcontroller.core.internal.OFMessageFuture;
 import net.floodlightcontroller.core.module.IFloodlightService;
-import net.onrc.onos.ofcontroller.core.INetMapTopologyObjects.IFlowEntry;
-import net.onrc.onos.ofcontroller.core.INetMapTopologyObjects.IFlowPath;
 import net.onrc.onos.ofcontroller.util.FlowEntry;
-import net.onrc.onos.ofcontroller.util.FlowPath;
 
 /**
  * FlowPusherService is a service to send message to switches in proper rate.
@@ -59,20 +56,10 @@
 	/**
 	 * Create a message from FlowEntry and add it to the queue of the switch.
 	 * @param sw Switch to which message is pushed.
-	 * @param flowPath FlowPath object used for creating message.
 	 * @param flowEntry FlowEntry object used for creating message.
 	 * @return true if message is successfully added to a queue.
 	 */
-	boolean add(IOFSwitch sw, FlowPath flowPath, FlowEntry flowEntry);
-
-	/**
-	 * Create a message from IFlowEntry and add it to the queue of the switch.
-	 * @param sw Switch to which message is pushed.
-	 * @param flowObj IFlowPath object used for creating message.
-	 * @param flowEntryObj IFlowEntry object used for creating message.
-	 * @return true if message is successfully added to a queue.
-	 */
-	boolean add(IOFSwitch sw, IFlowPath flowObj, IFlowEntry flowEntryObj);
+	boolean add(IOFSwitch sw, FlowEntry flowEntry);
 
 	/**
 	 * Set sending rate to a switch.
diff --git a/src/test/java/net/onrc/onos/ofcontroller/flowprogrammer/FlowPusherTest.java b/src/test/java/net/onrc/onos/ofcontroller/flowprogrammer/FlowPusherTest.java
new file mode 100644
index 0000000..4c66367
--- /dev/null
+++ b/src/test/java/net/onrc/onos/ofcontroller/flowprogrammer/FlowPusherTest.java
@@ -0,0 +1,562 @@
+package net.onrc.onos.ofcontroller.flowprogrammer;
+
+import static org.junit.Assert.*;
+import static org.powermock.api.easymock.PowerMock.createMock;
+
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.concurrent.ScheduledExecutorService;
+import java.util.concurrent.TimeUnit;
+
+import net.floodlightcontroller.core.FloodlightContext;
+import net.floodlightcontroller.core.IFloodlightProviderService;
+import net.floodlightcontroller.core.IOFSwitch;
+import net.floodlightcontroller.core.module.FloodlightModuleContext;
+import net.floodlightcontroller.threadpool.IThreadPoolService;
+import net.floodlightcontroller.util.OFMessageDamper;
+import net.onrc.onos.ofcontroller.core.INetMapTopologyObjects.IFlowEntry;
+import net.onrc.onos.ofcontroller.core.INetMapTopologyObjects.IFlowPath;
+import net.onrc.onos.ofcontroller.util.CallerId;
+import net.onrc.onos.ofcontroller.util.DataPath;
+import net.onrc.onos.ofcontroller.util.Dpid;
+import net.onrc.onos.ofcontroller.util.FlowEntry;
+import net.onrc.onos.ofcontroller.util.FlowEntryAction;
+import net.onrc.onos.ofcontroller.util.FlowEntryActions;
+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.FlowEntryUserState;
+import net.onrc.onos.ofcontroller.util.FlowId;
+import net.onrc.onos.ofcontroller.util.FlowPath;
+import net.onrc.onos.ofcontroller.util.FlowPathFlags;
+import net.onrc.onos.ofcontroller.util.FlowPathType;
+import net.onrc.onos.ofcontroller.util.FlowPathUserState;
+import net.onrc.onos.ofcontroller.util.Port;
+import net.onrc.onos.ofcontroller.util.SwitchPort;
+
+import org.easymock.EasyMock;
+import org.easymock.IAnswer;
+import org.junit.Ignore;
+import org.junit.Test;
+import org.openflow.protocol.OFBarrierRequest;
+import org.openflow.protocol.OFFlowMod;
+import org.openflow.protocol.OFMatch;
+import org.openflow.protocol.OFMessage;
+import org.openflow.protocol.OFType;
+import org.openflow.protocol.action.OFAction;
+import org.openflow.protocol.factory.BasicFactory;
+
+public class FlowPusherTest {
+	private FlowPusher pusher;
+	private FloodlightContext context;
+	private FloodlightModuleContext modContext;
+	private BasicFactory factory;
+	private OFMessageDamper damper;
+	private IFloodlightProviderService flservice;
+	private IThreadPoolService tpservice;
+
+	/**
+	 * Test single OFMessage is correctly sent to single switch via MessageDamper.
+	 */
+	@Test
+	public void testAddMessage() {
+		beginInitMock();
+		
+		OFMessage msg = EasyMock.createMock(OFMessage.class);
+		EasyMock.expect(msg.getXid()).andReturn(1).anyTimes();
+		EasyMock.expect(msg.getLength()).andReturn((short)100).anyTimes();
+		EasyMock.replay(msg);
+		
+		IOFSwitch sw = EasyMock.createMock(IOFSwitch.class);
+		EasyMock.expect(sw.getId()).andReturn((long)1).anyTimes();
+		sw.flush();
+		EasyMock.expectLastCall().once();
+		EasyMock.replay(sw);
+		
+		try {
+			EasyMock.expect(damper.write(EasyMock.eq(sw), EasyMock.eq(msg), EasyMock.eq(context))).andReturn(true).once();
+		} catch (IOException e1) {
+			fail("Failed in OFMessageDamper#write()");
+		}
+		
+		endInitMock();
+		initPusher(1);
+		
+		boolean add_result = pusher.add(sw, msg);
+		assertTrue(add_result);
+		
+		try {
+			// wait until message is processed.
+			Thread.sleep(1000);
+		} catch (InterruptedException e) {
+			fail("Failed in Thread.sleep()");
+		}
+		
+		EasyMock.verify(msg);
+		EasyMock.verify(sw);
+		
+		pusher.stop();
+	}
+	
+	/**
+	 * Test bunch of OFMessages are correctly sent to single switch via MessageDamper.
+	 */
+	@Test
+	public void testMassiveAddMessage() {
+		final int NUM_MSG = 10000;
+		
+		beginInitMock();
+
+		IOFSwitch sw = EasyMock.createMock(IOFSwitch.class);
+		EasyMock.expect(sw.getId()).andReturn((long)1).anyTimes();
+		sw.flush();
+		EasyMock.expectLastCall().atLeastOnce();
+		EasyMock.replay(sw);
+		
+		List<OFMessage> messages = new ArrayList<OFMessage>();
+		
+		for (int i = 0; i < NUM_MSG; ++i) {
+			OFMessage msg = EasyMock.createMock(OFMessage.class);
+			EasyMock.expect(msg.getXid()).andReturn(i).anyTimes();
+			EasyMock.expect(msg.getLength()).andReturn((short)100).anyTimes();
+			EasyMock.replay(msg);
+			messages.add(msg);
+			
+			try {
+				EasyMock.expect(damper.write(EasyMock.eq(sw), EasyMock.eq(msg), EasyMock.eq(context)))
+					.andReturn(true).once();
+			} catch (IOException e1) {
+				fail("Failed in OFMessageDamper#write()");
+			}
+		}
+		
+		endInitMock();
+		initPusher(1);
+		
+		for (OFMessage msg : messages) {
+			boolean add_result = pusher.add(sw, msg);
+			assertTrue(add_result);
+		}
+		
+		try {
+			// wait until message is processed.
+			Thread.sleep(1000);
+		} catch (InterruptedException e) {
+			fail("Failed in Thread.sleep()");
+		}
+		
+		for (OFMessage msg : messages) {
+			EasyMock.verify(msg);
+		}
+		EasyMock.verify(sw);
+		
+		pusher.stop();
+	}
+	
+	/**
+	 * Test bunch of OFMessages are correctly sent to multiple switches with single threads.
+	 */
+	@Test
+	public void testMultiSwitchAddMessage() {
+		final int NUM_SWITCH = 10;
+		final int NUM_MSG = 100;	// messages per thread
+		
+		beginInitMock();
+
+		Map<IOFSwitch, List<OFMessage>> sw_map = new HashMap<IOFSwitch, List<OFMessage>>();
+		for (int i = 0; i < NUM_SWITCH; ++i) {
+			IOFSwitch sw = EasyMock.createMock(IOFSwitch.class);
+			EasyMock.expect(sw.getId()).andReturn((long)i).anyTimes();
+			sw.flush();
+			EasyMock.expectLastCall().atLeastOnce();
+			EasyMock.replay(sw);
+			
+			List<OFMessage> messages = new ArrayList<OFMessage>();
+			
+			for (int j = 0; j < NUM_MSG; ++j) {
+				OFMessage msg = EasyMock.createMock(OFMessage.class);
+				EasyMock.expect(msg.getXid()).andReturn(j).anyTimes();
+				EasyMock.expect(msg.getLength()).andReturn((short)100).anyTimes();
+				EasyMock.replay(msg);
+				messages.add(msg);
+				
+				try {
+					EasyMock.expect(damper.write(EasyMock.eq(sw), EasyMock.eq(msg), EasyMock.eq(context)))
+						.andReturn(true).once();
+				} catch (IOException e1) {
+					fail("Failed in OFMessageDamper#write()");
+				}
+			}
+			sw_map.put(sw, messages);
+		}
+		
+		endInitMock();
+		initPusher(1);
+		
+		for (IOFSwitch sw : sw_map.keySet()) {
+			for (OFMessage msg : sw_map.get(sw)) {
+				boolean add_result = pusher.add(sw, msg);
+				assertTrue(add_result);
+			}
+		}
+		
+		try {
+			// wait until message is processed.
+			Thread.sleep(1000);
+		} catch (InterruptedException e) {
+			fail("Failed in Thread.sleep()");
+		}
+		
+		for (IOFSwitch sw : sw_map.keySet()) {
+			for (OFMessage msg : sw_map.get(sw)) {
+				EasyMock.verify(msg);
+			}
+			
+			EasyMock.verify(sw);
+		}
+		
+		pusher.stop();
+	}
+	
+	/**
+	 * Test bunch of OFMessages are correctly sent to multiple switches using multiple threads.
+	 */
+	@Test
+	public void testMultiThreadedAddMessage() {
+		final int NUM_THREAD = 10;
+		final int NUM_MSG = 100;	// messages per thread
+		
+		beginInitMock();
+
+		Map<IOFSwitch, List<OFMessage>> sw_map = new HashMap<IOFSwitch, List<OFMessage>>();
+		for (int i = 0; i < NUM_THREAD; ++i) {
+			IOFSwitch sw = EasyMock.createMock(IOFSwitch.class);
+			EasyMock.expect(sw.getId()).andReturn((long)i).anyTimes();
+			sw.flush();
+			EasyMock.expectLastCall().atLeastOnce();
+			EasyMock.replay(sw);
+			
+			List<OFMessage> messages = new ArrayList<OFMessage>();
+			
+			for (int j = 0; j < NUM_MSG; ++j) {
+				OFMessage msg = EasyMock.createMock(OFMessage.class);
+				EasyMock.expect(msg.getXid()).andReturn(j).anyTimes();
+				EasyMock.expect(msg.getLength()).andReturn((short)100).anyTimes();
+				EasyMock.replay(msg);
+				messages.add(msg);
+				
+				try {
+					EasyMock.expect(damper.write(EasyMock.eq(sw), EasyMock.eq(msg), EasyMock.eq(context)))
+						.andReturn(true).once();
+				} catch (IOException e1) {
+					fail("Failed in OFMessageDamper#write()");
+				}
+			}
+			sw_map.put(sw, messages);
+		}
+		
+		endInitMock();
+		initPusher(NUM_THREAD);
+		
+		for (IOFSwitch sw : sw_map.keySet()) {
+			for (OFMessage msg : sw_map.get(sw)) {
+				boolean add_result = pusher.add(sw, msg);
+				assertTrue(add_result);
+			}
+		}
+		
+		try {
+			// wait until message is processed.
+			Thread.sleep(1000);
+		} catch (InterruptedException e) {
+			fail("Failed in Thread.sleep()");
+		}
+		
+		for (IOFSwitch sw : sw_map.keySet()) {
+			for (OFMessage msg : sw_map.get(sw)) {
+				EasyMock.verify(msg);
+			}
+			
+			EasyMock.verify(sw);
+		}
+		
+		pusher.stop();
+	}
+	
+	private long barrierTime = 0;
+	/**
+	 * Test rate limitation of messages works correctly.
+	 */
+	@Test
+	public void testRateLimitedAddMessage() {
+		final long LIMIT_RATE = 100; // [bytes/ms]
+		final int NUM_MSG = 1000;
+		
+		// Accuracy of FlowPusher's rate calculation can't be measured by unit test
+		// because switch doesn't return BARRIER_REPLY.
+		// In unit test we use approximate way to measure rate. This value is 
+		// acceptable margin of measured rate.
+		final double ACCEPTABLE_RATE = LIMIT_RATE * 1.2;
+		
+		beginInitMock();
+
+		IOFSwitch sw = EasyMock.createMock(IOFSwitch.class);
+		EasyMock.expect(sw.getId()).andReturn((long)1).anyTimes();
+		sw.flush();
+		EasyMock.expectLastCall().atLeastOnce();
+		prepareBarrier(sw);
+		EasyMock.replay(sw);
+		
+		List<OFMessage> messages = new ArrayList<OFMessage>();
+		
+		for (int i = 0; i < NUM_MSG; ++i) {
+			OFMessage msg = EasyMock.createMock(OFMessage.class);
+			EasyMock.expect(msg.getXid()).andReturn(1).anyTimes();
+			EasyMock.expect(msg.getLength()).andReturn((short)100).anyTimes();
+			EasyMock.expect(msg.getLengthU()).andReturn(100).anyTimes();
+			EasyMock.replay(msg);
+			messages.add(msg);
+			
+			try {
+				EasyMock.expect(damper.write(EasyMock.eq(sw), EasyMock.eq(msg), EasyMock.eq(context)))
+					.andReturn(true).once();
+			} catch (IOException e) {
+				fail("Failed in OFMessageDamper#write()");
+			}
+		}
+		
+		try {
+			EasyMock.expect(damper.write(EasyMock.eq(sw), (OFMessage)EasyMock.anyObject(), EasyMock.eq(context)))
+				.andAnswer(new IAnswer<Boolean>() {
+					@Override
+					public Boolean answer() throws Throwable {
+						OFMessage msg = (OFMessage)EasyMock.getCurrentArguments()[1];
+						if (msg.getType() == OFType.BARRIER_REQUEST) {
+							barrierTime = System.currentTimeMillis();
+						}
+						return true;
+					}
+				}).once();
+		} catch (IOException e1) {
+			fail("Failed in OFMessageDamper#write()");
+		}
+
+		endInitMock();
+		initPusher(1);
+		
+		pusher.createQueue(sw);
+		pusher.setRate(sw, LIMIT_RATE);
+		
+		long beginTime = System.currentTimeMillis();
+		for (OFMessage msg : messages) {
+			boolean add_result = pusher.add(sw, msg);
+			assertTrue(add_result);
+		}
+		
+		pusher.barrierAsync(sw);
+
+		try {
+			do {
+				Thread.sleep(1000);
+			} while (barrierTime == 0);
+		} catch (InterruptedException e) {
+			fail("Failed to sleep");
+		}
+		
+		double measured_rate = NUM_MSG * 100 /  (barrierTime - beginTime);
+		assertTrue(measured_rate < ACCEPTABLE_RATE);
+		
+		for (OFMessage msg : messages) {
+			EasyMock.verify(msg);
+		}
+		EasyMock.verify(sw);
+		
+		pusher.stop();
+	}
+
+	/**
+	 * Test barrier message is correctly sent to a switch.
+	 */
+	@Test
+	public void testBarrierMessage() {
+		beginInitMock();
+		
+		IOFSwitch sw = EasyMock.createMock(IOFSwitch.class);
+		EasyMock.expect(sw.getId()).andReturn((long)1).anyTimes();
+		sw.flush();
+		EasyMock.expectLastCall().atLeastOnce();
+		prepareBarrier(sw);
+		EasyMock.replay(sw);
+
+		try {
+			EasyMock.expect(damper.write(EasyMock.eq(sw), (OFMessage)EasyMock.anyObject(), EasyMock.eq(context)))
+				.andReturn(true).once();
+		} catch (IOException e1) {
+			fail("Failed in OFMessageDamper#write()");
+		}
+
+		endInitMock();
+		initPusher(1);
+
+		OFBarrierReplyFuture future = pusher.barrierAsync(sw);
+		
+		assertNotNull(future);
+		pusher.stop();
+	}
+	
+	/**
+	 * Test FlowObject is correctly converted to message and is sent to a switch.
+	 */
+	@SuppressWarnings("unchecked")
+	@Test
+	public void testAddFlow() {
+		// Code below are copied from FlowManagerTest
+		
+		// instantiate required objects
+		FlowEntry flowEntry1 = new FlowEntry();
+		flowEntry1.setDpid(new Dpid(1));
+		flowEntry1.setFlowId(new FlowId(1));
+		flowEntry1.setInPort(new Port((short) 1));
+		flowEntry1.setOutPort(new Port((short) 11));
+		flowEntry1.setFlowEntryId(new FlowEntryId(1));
+		flowEntry1.setFlowEntryMatch(new FlowEntryMatch());
+		flowEntry1.setFlowEntryActions(new FlowEntryActions());
+		flowEntry1.setFlowEntryErrorState(new FlowEntryErrorState());
+		flowEntry1.setFlowEntryUserState(FlowEntryUserState.FE_USER_ADD);
+		
+		beginInitMock();
+		
+		OFFlowMod msg = EasyMock.createMock(OFFlowMod.class);
+		EasyMock.expect(msg.setIdleTimeout(EasyMock.anyShort())).andReturn(msg);
+		EasyMock.expect(msg.setHardTimeout(EasyMock.anyShort())).andReturn(msg);
+		EasyMock.expect(msg.setPriority(EasyMock.anyShort())).andReturn(msg);
+		EasyMock.expect(msg.setBufferId(EasyMock.anyInt())).andReturn(msg);
+		EasyMock.expect(msg.setCookie(EasyMock.anyLong())).andReturn(msg);
+		EasyMock.expect(msg.setCommand(EasyMock.anyShort())).andReturn(msg);
+		EasyMock.expect(msg.setMatch(EasyMock.anyObject(OFMatch.class))).andReturn(msg);
+		EasyMock.expect(msg.setActions((List<OFAction>)EasyMock.anyObject())).andReturn(msg);
+		EasyMock.expect(msg.setLengthU(EasyMock.anyShort())).andReturn(msg);
+		EasyMock.expect(msg.setOutPort(EasyMock.anyShort())).andReturn(msg).atLeastOnce();
+		EasyMock.expect(msg.getXid()).andReturn(1).anyTimes();
+		EasyMock.expect(msg.getType()).andReturn(OFType.FLOW_MOD).anyTimes();
+		EasyMock.expect(msg.getLength()).andReturn((short)100).anyTimes();
+		EasyMock.replay(msg);
+		
+		EasyMock.expect(factory.getMessage(EasyMock.eq(OFType.FLOW_MOD))).andReturn(msg);
+		
+		ScheduledExecutorService executor = EasyMock.createMock(ScheduledExecutorService.class);
+		EasyMock.expect(executor.schedule((Runnable)EasyMock.anyObject(), EasyMock.anyLong(),
+				(TimeUnit)EasyMock.anyObject())).andReturn(null).once();
+		EasyMock.replay(executor);
+		EasyMock.expect(tpservice.getScheduledExecutor()).andReturn(executor);
+
+		IOFSwitch sw = EasyMock.createMock(IOFSwitch.class);
+		EasyMock.expect(sw.getId()).andReturn((long)1).anyTimes();
+		EasyMock.expect(sw.getStringId()).andReturn("1").anyTimes();
+		sw.flush();
+		EasyMock.expectLastCall().once();
+		EasyMock.replay(sw);
+		
+		try {
+			EasyMock.expect(damper.write(EasyMock.eq(sw), EasyMock.anyObject(OFMessage.class), EasyMock.eq(context)))
+				.andAnswer(new IAnswer<Boolean>() {
+					@Override
+					public Boolean answer() throws Throwable {
+						OFMessage msg = (OFMessage)EasyMock.getCurrentArguments()[1];
+						assertEquals(msg.getType(), OFType.FLOW_MOD);
+						return true;
+					}
+				}).once();
+		} catch (IOException e1) {
+			fail("Failed in OFMessageDamper#write()");
+		}
+		
+		endInitMock();
+		initPusher(1);
+
+		pusher.add(sw, flowEntry1);
+		
+		try {
+			Thread.sleep(1000);
+		} catch (InterruptedException e) {
+			fail("Failed to sleep");
+		}
+		
+		EasyMock.verify(sw);
+		
+		pusher.stop();
+	}
+	
+	private void beginInitMock() {
+		context = EasyMock.createMock(FloodlightContext.class);
+		modContext = EasyMock.createMock(FloodlightModuleContext.class);
+		factory = EasyMock.createMock(BasicFactory.class);
+		damper = EasyMock.createMock(OFMessageDamper.class);
+		flservice = EasyMock.createMock(IFloodlightProviderService.class);
+		tpservice = EasyMock.createMock(IThreadPoolService.class);
+		
+		EasyMock.expect(modContext.getServiceImpl(EasyMock.eq(IThreadPoolService.class)))
+			.andReturn(tpservice).once();
+		EasyMock.expect(modContext.getServiceImpl(EasyMock.eq(IFloodlightProviderService.class)))
+			.andReturn(flservice).once();
+		flservice.addOFMessageListener(EasyMock.eq(OFType.BARRIER_REPLY),
+				(FlowPusher) EasyMock.anyObject());
+		EasyMock.expectLastCall().once();
+	}
+	
+	private void endInitMock() {
+		EasyMock.replay(tpservice);
+		EasyMock.replay(flservice);
+		EasyMock.replay(damper);
+		EasyMock.replay(factory);
+		EasyMock.replay(modContext);
+		EasyMock.replay(context);
+	}
+	
+	private void initPusher(int num_thread) {
+		pusher = new FlowPusher(num_thread);
+		pusher.init(context, modContext, factory, damper);
+		pusher.start();
+	}
+	
+	private void prepareBarrier(IOFSwitch sw) {
+		OFBarrierRequest req = EasyMock.createMock(OFBarrierRequest.class);
+		req.setXid(EasyMock.anyInt());
+		EasyMock.expectLastCall().once();
+		EasyMock.expect(req.getXid()).andReturn(1).anyTimes();
+		EasyMock.expect(req.getType()).andReturn(OFType.BARRIER_REQUEST).anyTimes();
+		EasyMock.expect(req.getLength()).andReturn((short)100).anyTimes();
+		EasyMock.replay(req);
+		EasyMock.expect(factory.getMessage(EasyMock.eq(OFType.BARRIER_REQUEST))).andReturn(req);
+		
+		ScheduledExecutorService executor = EasyMock.createMock(ScheduledExecutorService.class);
+		EasyMock.expect(executor.schedule((Runnable)EasyMock.anyObject(), EasyMock.anyLong(),
+				(TimeUnit)EasyMock.anyObject())).andReturn(null).once();
+		EasyMock.replay(executor);
+		EasyMock.expect(tpservice.getScheduledExecutor()).andReturn(executor);
+
+		EasyMock.expect(sw.getNextTransactionId()).andReturn(1);
+	}
+	
+	// Copied from FlowManagerTest
+	private IFlowPath createIFlowPathMock(long flowId, String installerID,
+			String flowPathType, String flowPathUserState,
+			long flowPathFlags, long srcDpid, int srcPort,
+			long dstDpid, int dstPort) {
+		IFlowPath iFlowPath = EasyMock.createNiceMock(IFlowPath.class);
+		EasyMock.expect(iFlowPath.getFlowId()).andReturn(new FlowId(flowId).toString()).anyTimes();
+		EasyMock.expect(iFlowPath.getInstallerId()).andReturn(installerID).anyTimes();
+		EasyMock.expect(iFlowPath.getFlowPathType()).andReturn(flowPathType).anyTimes();
+		EasyMock.expect(iFlowPath.getFlowPathUserState()).andReturn(flowPathUserState).anyTimes();
+		EasyMock.expect(iFlowPath.getFlowPathFlags()).andReturn(new Long(flowPathFlags)).anyTimes();
+		EasyMock.expect(iFlowPath.getSrcSwitch()).andReturn(new Dpid(srcDpid).toString()).anyTimes();
+		EasyMock.expect(iFlowPath.getSrcPort()).andReturn(new Short((short)srcPort)).anyTimes();
+		EasyMock.expect(iFlowPath.getDstSwitch()).andReturn(new Dpid(dstDpid).toString()).anyTimes();
+		EasyMock.expect(iFlowPath.getDstPort()).andReturn(new Short((short)dstPort)).anyTimes();
+		return iFlowPath;
+	}
+	
+}