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Java > Open Source Codes > org > objectweb > dream > router > RouterRandomImpl


1 /**
2  * Dream
3  * Copyright (C) 2003-2004 INRIA Rhone-Alpes
4  *
5  * This library is free software; you can redistribute it and/or
6  * modify it under the terms of the GNU Lesser General Public
7  * License as published by the Free Software Foundation; either
8  * version 2 of the License, or (at your option) any later version.
9  *
10  * This library is distributed in the hope that it will be useful,
11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13  * Lesser General Public License for more details.
14  *
15  * You should have received a copy of the GNU Lesser General Public
16  * License along with this library; if not, write to the Free Software
17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18  *
19  * Contact: dream@objectweb.org
20  *
21  * Initial developer(s): Vivien Quema
22  * Contributor(s):
23  */
24
25 package org.objectweb.dream.router;
26
27 import java.util.Collection JavaDoc;
28 import java.util.Iterator JavaDoc;
29 import java.util.Map JavaDoc;
30 import java.util.Random JavaDoc;
31
32 import org.objectweb.dream.Push;
33 import org.objectweb.dream.message.Message;
34
35 /**
36  * This router randomly chooses one of its outputs. Note that
37  * <code>defaultOutPushItf</code> is only chosen if no route is bound to the
38  * router.
39  */
40 public class RouterRandomImpl extends AbstractRouterImpl
41 {
42
43   Random JavaDoc random = new Random JavaDoc();
44   Push[] itfs;
45
46   /**
47    * @see org.objectweb.dream.router.AbstractRouterImpl#getOutput(org.objectweb.dream.message.Message,
48    * java.util.Map)
49    */
50   protected Push getOutput(Message message, Map JavaDoc context)
51   {
52     if (!initialized)
53     {
54       Collection JavaDoc values = outPushMap.values();
55       Iterator JavaDoc iter = values.iterator();
56       itfs = new Push[values.size()];
57       int i = 0;
58       while (iter.hasNext())
59       {
60         itfs[i] = (Push) iter.next();
61         i++;
62       }
63       initialized = true;
64     }
65     if (itfs.length > 0)
66     {
67       return itfs[random.nextInt(itfs.length)];
68     }
69     return null;
70   }
71
72 }
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