splitting roles from IO loop and providing a abstract of switch
diff --git a/of/api/src/main/java/org/onlab/onos/of/controller/PacketListener.java b/of/api/src/main/java/org/onlab/onos/of/controller/PacketListener.java
new file mode 100644
index 0000000..5c6d73f
--- /dev/null
+++ b/of/api/src/main/java/org/onlab/onos/of/controller/PacketListener.java
@@ -0,0 +1,13 @@
+package org.onlab.onos.of.controller;
+
+/**
+ * Notifies providers about Packet in events.
+ */
+public interface PacketListener {
+
+ /**
+ * Handle the packet.
+ * @param pktCtx the packet context ({@link }
+ */
+ public void handlePacket(PacketContext pktCtx);
+}