[ONOS-2591] Interface to manage BGP peer connections

Change-Id: Iae063c6dbbde4af15c2313395af0d00bfb49a120

+/*
+ * Copyright 2015 Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
+ * an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations under the License.
+ */
+package org.onosproject.bgp.controller;
+
+/**
+ * Responsible for keeping track of the current set BGPLS peers connected to the system.
+ *
+ */
+public interface BgpPeerManager {
+
+    /**
+     * Add connected peer.
+     *
+     * @param bgpId BGP ID to add
+     * @param bgpPeer BGp peer instance
+     *
+     * @return false if peer already exist, otherwise true
+     */
+    public boolean addConnectedPeer(BGPId bgpId, BGPPeer bgpPeer);
+
+    /**
+     * Validate wheather peer is connected.
+     *
+     * @param bgpId BGP ID to validate
+     *
+     * @return true if peer exist, otherwise false
+     */
+    public boolean isPeerConnected(BGPId bgpId);
+
+    /**
+     * Remove connected peer.
+     *
+     * @param bgpId BGP ID
+     */
+    public void removeConnectedPeer(BGPId bgpId);
+
+    /**
+     * Gets connected peer.
+     *
+     * @param bgpId BGP ID
+     * @return BGPPeer the connected peer, otherwise null
+     */
+    public BGPPeer getPeer(BGPId bgpId);
+}