1   /**
2    * Copyright (c) 2000-2008 Liferay, Inc. All rights reserved.
3    *
4    * Permission is hereby granted, free of charge, to any person obtaining a copy
5    * of this software and associated documentation files (the "Software"), to deal
6    * in the Software without restriction, including without limitation the rights
7    * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
8    * copies of the Software, and to permit persons to whom the Software is
9    * furnished to do so, subject to the following conditions:
10   *
11   * The above copyright notice and this permission notice shall be included in
12   * all copies or substantial portions of the Software.
13   *
14   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
17   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
19   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
20   * SOFTWARE.
21   */
22  
23  package com.liferay.util.transport;
24  
25  import com.liferay.portal.kernel.util.GetterUtil;
26  
27  import java.net.DatagramPacket;
28  
29  /**
30   * <a href="MulticastClientTool.java.html"><b><i>View Source</i></b></a>
31   *
32   * <p>
33   * A client that listens for multicast messages at a designated port. You may
34   * use this to for potential multicast issues when tuning distributed caches.
35   * </p>
36   *
37   * @author Michael C. Han
38   *
39   */
40  public class MulticastClientTool {
41  
42      public static void main(String[] args) {
43          try {
44              int port = GetterUtil.getInteger(args[1]);
45  
46              DatagramHandler handler = new DatagramHandler() {
47  
48                  public void process(DatagramPacket packet) {
49                      String s = new String(
50                          packet.getData(), 0, packet.getLength());
51  
52                      System.out.println(s);
53                  }
54  
55                  public void errorReceived(Throwable t) {
56                      t.printStackTrace();
57                  }
58  
59              };
60  
61              MulticastTransport transport = new MulticastTransport(
62                  handler, args[0], port);
63  
64              transport.connect();
65  
66              synchronized (transport) {
67                  transport.wait();
68              }
69          }
70          catch (Exception e) {
71              e.printStackTrace();
72  
73              System.err.println(
74                  "Usage: java MulticastClientTool multicastAddress port");
75  
76              System.exit(1);
77          }
78      }
79  
80  }