Message


1   /**
2    * EasyBeans
3    * Copyright (C) 2006 Bull S.A.S.
4    * Contact: easybeans@objectweb.org
5    *
6    * This library is free software; you can redistribute it and/or
7    * modify it under the terms of the GNU Lesser General Public
8    * License as published by the Free Software Foundation; either
9    * version 2.1 of the License, or any later version.
10   *
11   * This library is distributed in the hope that it will be useful,
12   * but WITHOUT ANY WARRANTY; without even the implied warranty of
13   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14   * Lesser General Public License for more details.
15   *
16   * You should have received a copy of the GNU Lesser General Public
17   * License along with this library; if not, write to the Free Software
18   * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
19   * USA
20   *
21   * --------------------------------------------------------------------------
22   * $Id:$
23   * --------------------------------------------------------------------------
24   */
25  
26  package org.objectweb.easybeans.component.smartclient.api;
27  
28  import java.nio.ByteBuffer  ;
29  
30  /**
31   * All messages needs to implement this interface.
32   * @author Florent Benoit
33   */
34  public interface Message {
35  
36      /**
37       * Size to store an int in bytes.
38       */
39      int INT_BYTE_SIZE = 4;
40  
41      /**
42       * Header.
43       * <ul>
44       * <li> byte = version</li>
45       * <li> byte = opcode</li>
46       * <li> int = length</li>
47       * </ul>
48       */
49      int HEADER_SIZE = 1 + 1 + INT_BYTE_SIZE;
50  
51  
52      /**
53       * Gets the OpCode of this message.
54       * @return the operation code.
55       */
56      byte getOpCode();
57  
58      /**
59       * Gets a message to send.
60       * @return the bytebuffer to send
61       */
62      ByteBuffer   getMessage();
63  }
64

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