1   /**
2    * Copyright (c) 2000-2009 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 java.net.DatagramPacket;
26  import java.net.InetAddress;
27  
28  /**
29   * <a href="MulticastServerTool.java.html"><b><i>View Source</i></b></a>
30   *
31   * <p>
32   * A server that will send out heart beat messages until you kill it. This
33   * enables you to try and debug multicast issues.
34   * </p>
35   *
36   * @author Michael C. Han
37   */
38  public class MulticastServerTool {
39  
40      public static void main(String[] args) {
41          try {
42              int port = Integer.parseInt(args[1]);
43              long interval = Long.parseLong(args[2]);
44  
45              DatagramHandler handler = new DatagramHandler() {
46  
47                  public void process(DatagramPacket packet) {
48                      String s = new String(
49                          packet.getData(), 0, packet.getLength());
50  
51                      System.out.println(s);
52                  }
53  
54                  public void errorReceived(Throwable t) {
55                      t.printStackTrace();
56                  }
57  
58              };
59  
60              MulticastTransport transport = new MulticastTransport(
61                  handler, args[0], port);
62  
63              transport.connect();
64  
65              String msg =
66                  InetAddress.getLocalHost().getHostName() + ":" + port +
67                      " heartbeat " ;
68  
69              int i = 0;
70  
71              while (true) {
72                  transport.sendMessage(msg + i);
73  
74                  i++;
75  
76                  Thread.sleep(interval);
77              }
78          }
79          catch (Exception e) {
80              e.printStackTrace();
81  
82              System.err.println(
83                  "Usage: java MulticastServerTool multicastAddress port " +
84                      "interval");
85  
86              System.exit(1);
87          }
88      }
89  
90  }