package org.apache.helix.examples;
   
   /*
    * 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.
   */
  
  import java.io.File;
  import java.io.IOException;
  
  import org.I0Itec.zkclient.IDefaultNameSpace;
  import org.I0Itec.zkclient.ZkServer;
  import org.apache.commons.io.FileUtils;
  
  public class ExampleHelper
  {
    
    
    public static ZkServer startZkServer(String zkAddr)
    {
      System.out.println("Start zookeeper at " + zkAddr + " in thread "
          + Thread.currentThread().getName());
  
      String zkDir = zkAddr.replace(':', '_');
      final String logDir = "/tmp/" + zkDir + "/logs";
      final String dataDir = "/tmp/" + zkDir + "/dataDir";
      try
      {
        FileUtils.deleteDirectory(new File(dataDir));
        FileUtils.deleteDirectory(new File(logDir));
      } catch (IOException e)
      {
        // TODO Auto-generated catch block
        e.printStackTrace();
      }
  
      IDefaultNameSpace defaultNameSpace = new IDefaultNameSpace() {
        @Override
        public void createDefaultNameSpace(org.I0Itec.zkclient.ZkClient zkClient)
        {
          // do nothing
        }
      };
  
      int port = Integer.parseInt(zkAddr.substring(zkAddr.lastIndexOf(':') + 1));
      ZkServer zkServer = new ZkServer(dataDir, logDir, defaultNameSpace, port);
      zkServer.start();
  
      return zkServer;
    }
    
    public static void stopZkServer(ZkServer zkServer)
    {
      if (zkServer != null)
      {
        zkServer.shutdown();
        System.out.println("Shut down zookeeper at port " + zkServer.getPort()
            + " in thread " + Thread.currentThread().getName());
      }
    }
  }