001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *     http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018package org.apache.hadoop.hbase.master.zksyncer;
019
020import java.util.Collections;
021import java.util.Set;
022import org.apache.hadoop.hbase.Server;
023import org.apache.hadoop.hbase.zookeeper.ZKWatcher;
024import org.apache.yetus.audience.InterfaceAudience;
025
026/**
027 * Tracks the active master address on server ZK cluster and synchronize them to client ZK cluster
028 * if changed
029 */
030@InterfaceAudience.Private
031public class MasterAddressSyncer extends ClientZKSyncer {
032  private final String masterAddressZNode;
033
034  public MasterAddressSyncer(ZKWatcher watcher, ZKWatcher clientZkWatcher, Server server) {
035    super(watcher, clientZkWatcher, server);
036    masterAddressZNode = watcher.getZNodePaths().masterAddressZNode;
037  }
038
039  @Override
040  protected boolean validate(String path) {
041    return path.equals(masterAddressZNode);
042  }
043
044  @Override
045  protected Set<String> getPathsToWatch() {
046    return Collections.singleton(masterAddressZNode);
047  }
048}