content: /*
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements.  See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF licenses this file to You 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.apache.carbondata.core.locks;
  
  import java.io.IOException;
  
  import org.apache.carbondata.common.logging.LogServiceFactory;
  
  import org.apache.log4j.Logger;
  import org.apache.zookeeper.WatchedEvent;
  import org.apache.zookeeper.Watcher;
  import org.apache.zookeeper.ZooKeeper;
  
  /**
   * This is a singleton class for initialization of zookeeper client.
   */
  public class ZookeeperInit {
  
    private static final Logger LOGGER =
        LogServiceFactory.getLogService(ZookeeperInit.class.getName());
  
    private static ZookeeperInit zooKeeperInit;
    /**
     * zk is the zookeeper client instance
     */
    private ZooKeeper zk;
  
    private ZookeeperInit(String zooKeeperUrl) {
  
      int sessionTimeOut = 100000;
      try {
        zk = new ZooKeeper(zooKeeperUrl, sessionTimeOut, new DummyWatcher());
  
      } catch (IOException e) {
        LOGGER.error(e.getMessage(), e);
      }
  
    }
  
    public static ZookeeperInit getInstance(String zooKeeperUrl) {
  
      synchronized (ZookeeperInit.class) {
        if (null == zooKeeperInit) {
          LOGGER.info("Initiating Zookeeper client.");
          zooKeeperInit = new ZookeeperInit(zooKeeperUrl);
        }
      }
      return zooKeeperInit;
  
    }
  
    public ZooKeeper getZookeeper() {
      return zk;
    }
  
    private static class DummyWatcher implements Watcher {
      public void process(WatchedEvent event) {
      }
    }
  }
  