001/*
002 *
003 * Licensed to the Apache Software Foundation (ASF) under one
004 * or more contributor license agreements.  See the NOTICE file
005 * distributed with this work for additional information
006 * regarding copyright ownership.  The ASF licenses this file
007 * to you under the Apache License, Version 2.0 (the
008 * "License"); you may not use this file except in compliance
009 * with the License.  You may obtain a copy of the License at
010 *
011 *     http://www.apache.org/licenses/LICENSE-2.0
012 *
013 * Unless required by applicable law or agreed to in writing, software
014 * distributed under the License is distributed on an "AS IS" BASIS,
015 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
016 * See the License for the specific language governing permissions and
017 * limitations under the License.
018 */
019package org.apache.hadoop.hbase.replication;
020
021import java.util.List;
022
023import org.apache.yetus.audience.InterfaceAudience;
024
025/**
026 * The replication listener interface can be implemented if a class needs to subscribe to events
027 * generated by the ReplicationTracker. These events include things like addition/deletion of peer
028 * clusters or failure of a local region server. To receive events, the class also needs to register
029 * itself with a Replication Tracker.
030 */
031@InterfaceAudience.Private
032public interface ReplicationListener {
033
034  /**
035   * A region server has been removed from the local cluster
036   * @param regionServer the removed region server
037   */
038  public void regionServerRemoved(String regionServer);
039
040  /**
041   * A peer cluster has been removed (i.e. unregistered) from replication.
042   * @param peerId The peer id of the cluster that has been removed
043   */
044  public void peerRemoved(String peerId);
045
046  /**
047   * The list of registered peer clusters has changed.
048   * @param peerIds A list of all currently registered peer clusters
049   */
050  public void peerListChanged(List<String> peerIds);
051}