--- /dev/null
+
+/*
+ * Copyright (c) 2013 Cisco Systems, Inc. and others. All rights reserved.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v1.0 which accompanies this distribution,
+ * and is available at http://www.eclipse.org/legal/epl-v10.html
+ */
+
+package org.opendaylight.controller.sal.topology;
+
+/**
+ * @file IPluginInTopologyService.java
+ *
+ * @brief Methods that are invoked from SAL toward the protocol
+ * plugin.
+ *
+ * For example if SAL startup late in respect to a protocol plugin, or
+ * restarts, we need away to sollicit the push of older updates from
+ * Protocol Plugins this interface serve the purpose. This a practical
+ * example of the type of service provided by this interface
+ */
+
+/**
+ * Methods that are invoked from SAL toward the protocol
+ * plugin to sollicit Topoloy updates
+ *
+ */
+public interface IPluginInTopologyService {
+ /**
+ * Tell to protocol plugin that is time to send the updates of the
+ * current topology because someone joined late the game
+ *
+ */
+ public void sollicitRefresh();
+}