+ * Send Barrier message synchronously. The caller will be blocked until the
+ * Barrier reply arrives.
+ */
+ public Object syncSendBarrierMessage();
+
+ /**
+ * Send Barrier message asynchronously. The caller is not blocked. The
+ * Barrier message will be sent in a transmit thread which will be blocked
+ * until the Barrier reply arrives.
+ */
+ public Object asyncSendBarrierMessage();
+
+ /**
+ * Send a FLOW_MOD message with a wildcard match and action=DELETE.