diff --git a/src/main/java/net/onrc/onos/ofcontroller/flowmanager/IFlowPusherService.java b/src/main/java/net/onrc/onos/ofcontroller/flowmanager/IFlowPusherService.java
new file mode 100644
index 0000000..830d47f
--- /dev/null
+++ b/src/main/java/net/onrc/onos/ofcontroller/flowmanager/IFlowPusherService.java
@@ -0,0 +1,37 @@
+package net.onrc.onos.ofcontroller.flowmanager;
+
+import net.floodlightcontroller.core.IOFSwitch;
+import net.floodlightcontroller.core.module.IFloodlightService;
+
+import org.openflow.protocol.OFMessage;
+
+public interface IFlowPusherService extends IFloodlightService {
+	/**
+	 * Add a message to the queue of a switch.
+	 * @param sw
+	 * @param msg
+	 * @return
+	 */
+	void addMessage(long dpid, OFMessage msg);
+	
+	/**
+	 * Suspend pushing message to a switch.
+	 * @param sw
+	 * @return true if success
+	 */
+	boolean suspend(long dpid);
+	
+	/**
+	 * Resume pushing message to a switch.
+	 * @param sw
+	 * @return true if success
+	 */
+	boolean resume(long dpid);
+	
+	/**
+	 * Get whether pushing of message is suspended or not.
+	 * @param sw
+	 * @return true if suspended
+	 */
+	boolean isSuspended(long dpid);
+}