Minor cleanup in the TopologyManager API:
 * Added TopologyManager constructor for a given database operation handler.
 * Removed method TopologyManager.setDbOperationHandler()
diff --git a/src/test/java/net/onrc/onos/ofcontroller/topology/TopologyManagerTest.java b/src/test/java/net/onrc/onos/ofcontroller/topology/TopologyManagerTest.java
index fbec59e..8bdee72 100644
--- a/src/test/java/net/onrc/onos/ofcontroller/topology/TopologyManagerTest.java
+++ b/src/test/java/net/onrc/onos/ofcontroller/topology/TopologyManagerTest.java
@@ -64,8 +64,7 @@
 	TestDatabaseManager.populateTestData(titanGraph);
 
 	// Prepare the TopologyManager instance
-	topologyManager = new TopologyManager();
-	topologyManager.setDbOperationHandler(oper);
+	topologyManager = new TopologyManager(oper);
     }
 
     /**