helix-core/src/main/java/org/apache/helix/examples/ExampleHelper.java

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());
    }
  }
}