Added debug log
diff --git a/src/main/java/net/onrc/onos/graph/DBOperation.java b/src/main/java/net/onrc/onos/graph/DBOperation.java
index f92260d..bc8d404 100644
--- a/src/main/java/net/onrc/onos/graph/DBOperation.java
+++ b/src/main/java/net/onrc/onos/graph/DBOperation.java
@@ -51,6 +51,7 @@
 	 */
 	@Override
 	public ISwitchObject newSwitch(final String dpid) {
+	    System.out.println("newSwitch");
 	    ISwitchObject obj = (ISwitchObject) conn.getFramedGraph().addVertex(null, ISwitchObject.class);
 	    if (obj != null) {
 		obj.setType("switch");
@@ -64,6 +65,7 @@
 	 */
 	@Override
 	public Iterable<ISwitchObject> getAllSwitches() {
+	    System.out.println("getAllSwitches");
 	    Iterable<ISwitchObject> switches = conn.getFramedGraph().getVertices("type", "switch", ISwitchObject.class);
 	    return switches;
 	}
@@ -73,6 +75,7 @@
 	 */
 	@Override
 	public Iterable<ISwitchObject> getInactiveSwitches() {
+	    System.out.println("getInactiveSwitches");
 	    Iterable<ISwitchObject> switches = conn.getFramedGraph().getVertices("type", "switch", ISwitchObject.class);
 	    List<ISwitchObject> inactiveSwitches = new ArrayList<ISwitchObject>();
 
@@ -100,11 +103,13 @@
 	 */
 	@Override
 	public void removeSwitch(ISwitchObject sw) {
+	    System.out.println("removeSwitch");
 	    conn.getFramedGraph().removeVertex(sw.asVertex());
 	}
 
 	@Override
 	public IPortObject newPort(String dpid, Short portNum) {
+	    System.out.println("newPort");
 	    IPortObject obj = (IPortObject) conn.getFramedGraph().addVertex(null, IPortObject.class);
 	    if (obj != null) {
 		obj.setType("port");
@@ -137,6 +142,7 @@
 	 */
 	@Override
 	public IPortObject searchPort(String dpid, Short number) {
+	    System.out.println("searchPort");
 	    String id = dpid + number.toString();
 	    return (conn.getFramedGraph() != null && conn.getFramedGraph().getVertices("port_id", id).iterator().hasNext())
 		    ? (IPortObject) conn.getFramedGraph().getVertices("port_id", id, IPortObject.class).iterator().next() : null;
@@ -149,6 +155,7 @@
 	 */
 	@Override
 	public void removePort(IPortObject port) {
+	    System.out.println("removeProt");
 	    if (conn.getFramedGraph() != null) {
 		conn.getFramedGraph().removeVertex(port.asVertex());
 	    }
@@ -159,6 +166,7 @@
 	 */
 	@Override
 	public IDeviceObject newDevice() {
+	    System.out.println("newDevice");
 	    IDeviceObject obj = (IDeviceObject) conn.getFramedGraph().addVertex(null, IDeviceObject.class);
 	    if (obj != null) {
 		obj.setType("device");
@@ -171,6 +179,7 @@
 	 */
 	@Override
 	public Iterable<IDeviceObject> getDevices() {
+	    System.out.println("getDeiveces");
 	    return conn.getFramedGraph() != null ? conn.getFramedGraph().getVertices("type", "device", IDeviceObject.class) : null;
 	}
 
@@ -180,6 +189,7 @@
 	 */
 	@Override
 	public void removeDevice(IDeviceObject dev) {
+	    System.out.println("removeDevice");
 	    if (conn.getFramedGraph() != null) {
 		conn.getFramedGraph().removeVertex(dev.asVertex());
 	    }
@@ -219,6 +229,7 @@
 	*/
 	@Override
 	public ISwitchObject searchSwitch(final String dpid) {
+	    System.out.println("searchSwitch");
 	    return (conn.getFramedGraph() != null && conn.getFramedGraph().getVertices("dpid", dpid).iterator().hasNext())
 		    ? (ISwitchObject) (conn.getFramedGraph().getVertices("dpid", dpid, ISwitchObject.class).iterator().next()) : null;
 	}
@@ -286,6 +297,7 @@
 	 */
 	@Override
 	public void removeFlowPath(IFlowPath flowPath) {
+	    System.out.println("removeFlowPath");
 	    conn.getFramedGraph().removeVertex(flowPath.asVertex());
 	}
 	
@@ -315,6 +327,7 @@
 	 */
 	@Override
 	public void removeFlowEntry(IFlowEntry flowEntry) {
+	    System.out.println("removeFlowEntry");
 	    conn.getFramedGraph().removeVertex(flowEntry.asVertex());
 	}
 	
@@ -370,6 +383,7 @@
 	}
 
 	public void removeIpv4Address(IIpv4Address ipv4Address) {
+		System.out.println("removeIpv4Address");
 		conn.getFramedGraph().removeVertex(ipv4Address.asVertex());
 	}