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.ArrayList;
022import java.util.Collection;
023
024import org.apache.hadoop.hbase.Server;
025import org.apache.hadoop.hbase.zookeeper.ZKWatcher;
026import org.apache.yetus.audience.InterfaceAudience;
027
028/**
029 * Tracks the active master address on server ZK cluster and synchronize them to client ZK cluster
030 * if changed
031 */
032@InterfaceAudience.Private
033public class MasterAddressSyncer extends ClientZKSyncer {
034  private final String masterAddressZNode;
035
036  public MasterAddressSyncer(ZKWatcher watcher, ZKWatcher clientZkWatcher, Server server) {
037    super(watcher, clientZkWatcher, server);
038    masterAddressZNode = watcher.getZNodePaths().masterAddressZNode;
039  }
040
041  @Override
042  boolean validate(String path) {
043    return path.equals(masterAddressZNode);
044  }
045
046  @Override
047  Collection<String> getNodesToWatch() {
048    ArrayList<String> toReturn = new ArrayList<>();
049    toReturn.add(masterAddressZNode);
050    return toReturn;
051  }
052}