content: /**
   * Copyright The Apache Software Foundation
   *
   * 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 com.alibaba.wasp.zookeeper;
  
  import com.alibaba.wasp.conf.WaspConfiguration;
  import org.apache.hadoop.conf.Configuration;
  
  import java.util.Map.Entry;
  import java.util.Properties;
  
  /**
   * Tool for reading ZooKeeper servers from Wasp XML configuration and producing
   * a line-by-line list for use by bash scripts.
   */
  public class ZKServerTool {
    /**
     * Run the tool.
     * @param args Command line arguments.
     */
    public static void main(String args[]) {
      Configuration conf = WaspConfiguration.create();
      // Note that we do not simply grab the property
      // FConstants.ZOOKEEPER_QUORUM from the WaspConfiguration because the
      // user may be using a zoo.cfg file.
      Properties zkProps = ZKConfig.makeZKProps(conf);
      for (Entry<Object, Object> entry : zkProps.entrySet()) {
        String key = entry.getKey().toString().trim();
        String value = entry.getValue().toString().trim();
        if (key.startsWith("server.")) {
          String[] parts = value.split(":");
          String host = parts[0];
          System.out.println("ZK host:" + host);
        }
      }
    }
  }
  