1 /*
   2  * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 import java.io.IOException;
  25 import java.net.InetAddress;
  26 import java.net.MulticastSocket;
  27 import java.net.UnknownHostException;
  28 
  29 public class ClientConnection {
  30 
  31     public final String IANA_JDP_ADDRESS = "224.0.23.178";
  32     public final String IANA_JDP_PORT = "7095";
  33     public final String UNDEFINED_NAME = "TheVMwithNoName";
  34 
  35     public final int port;
  36     public final InetAddress address;
  37     public final int pauseInSeconds;
  38     public final String instanceName;
  39 
  40     public ClientConnection()
  41             throws UnknownHostException {
  42 
  43         String discoveryAddress = System.getProperty("com.sun.management.jdp.address", IANA_JDP_ADDRESS);
  44         address = InetAddress.getByName(discoveryAddress);
  45 
  46         String discoveryPort = System.getProperty("com.sun.management.jdp.port", IANA_JDP_PORT);
  47         port = Integer.parseInt(discoveryPort);
  48 
  49         String pause = System.getProperty("com.sun.management.jdp.pause", "1");
  50         pauseInSeconds = Integer.parseUnsignedInt(pause);
  51 
  52         instanceName = System.getProperty("com.sun.management.jdp.name", UNDEFINED_NAME);
  53 
  54     }
  55 
  56     public MulticastSocket connectWithTimeout(int msTimeOut) throws IOException {
  57         MulticastSocket socket = new MulticastSocket(port);
  58         socket.joinGroup(address);
  59         socket.setSoTimeout(msTimeOut);
  60         return socket;
  61     }
  62 }