1 /*
2  * Copyright (c) 2012, 2013, 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 
ClientConnection()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 
connectWithTimeout(int msTimeOut)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 }
63