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Java > Open Source Codes > org > objectweb > dream > message > MessageReferenceCounter


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): Matthieu Leclercq
22  * Contributor(s):
23  */
24
25 package org.objectweb.dream.message;
26
27 /**
28  * Interface implemented by message and used by some message manager to know the
29  * number of shared reference to a message. When a message instance is created,
30  * its reference counter must be initialized to <code>1</code>.
31  */
32 public interface MessageReferenceCounter
33 {
34
35   /**
36    * Increments the reference counter of the message.
37    */
38   void incrementReferenceCounter();
39
40   /**
41    * Decrements the reference counter of this message.
42    *
43    * @return <code>true</code> if the reference counter is null.
44    */
45   boolean decrementReferenceCounter();
46 }
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