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.master.zksyncer;
020
021import java.util.Collections;
022import java.util.Set;
023import org.apache.hadoop.hbase.Server;
024import org.apache.hadoop.hbase.zookeeper.ZKWatcher;
025import org.apache.yetus.audience.InterfaceAudience;
026
027/**
028 * Tracks the active master address on server ZK cluster and synchronize them to client ZK cluster
029 * if changed
030 */
031@InterfaceAudience.Private
032public class MasterAddressSyncer extends ClientZKSyncer {
033  private final String masterAddressZNode;
034
035  public MasterAddressSyncer(ZKWatcher watcher, ZKWatcher clientZkWatcher, Server server) {
036    super(watcher, clientZkWatcher, server);
037    masterAddressZNode = watcher.getZNodePaths().masterAddressZNode;
038  }
039
040  @Override
041  protected boolean validate(String path) {
042    return path.equals(masterAddressZNode);
043  }
044
045  @Override
046  protected Set<String> getPathsToWatch() {
047    return Collections.singleton(masterAddressZNode);
048  }
049}