SequenceNumberChunkImpl


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.queue;
26  
27  import java.io.Externalizable  ;
28  import java.io.IOException  ;
29  import java.io.ObjectInput  ;
30  import java.io.ObjectOutput  ;
31  
32  import org.objectweb.dream.message.AbstractChunk;
33  import org.objectweb.dream.message.Chunk;
34  import org.objectweb.dream.message.ChunkType;
35  
36  /**
37   * Basic implementation of the {@link SequenceNumberChunk}interface.
38   */
39  public class SequenceNumberChunkImpl extends AbstractChunk
40      implements
41        SequenceNumberChunk,
42        Externalizable  
43  {
44    /** The sequence number. */
45    protected long sn;
46  
47    // ---------------------------------------------------------------------------
48    // Implementation of the SequenceNumberChunk interface.
49    // ---------------------------------------------------------------------------
50  
51    /**
52     * @see org.objectweb.dream.queue.SequenceNumberChunk#getSequenceNumber()
53     */
54    public long getSequenceNumber()
55    {
56      return sn;
57    }
58  
59    /**
60     * @see org.objectweb.dream.queue.SequenceNumberChunk#setSequenceNumber(long)
61     */
62    public void setSequenceNumber(long sn)
63    {
64      this.sn = sn;
65    }
66  
67    // ---------------------------------------------------------------------------
68    // Implementation of the Chunk interface
69    // ---------------------------------------------------------------------------
70  
71    /**
72     * @see Chunk#getType()
73     */
74    public ChunkType getType()
75    {
76      return TYPE;
77    }
78  
79    /**
80     * @see Chunk#transfertState(Chunk)
81     */
82    public void transfertState(Chunk newInstance)
83    {
84      ((SequenceNumberChunk) newInstance).setSequenceNumber(getSequenceNumber());
85    }
86  
87    /**
88     * @see Chunk#recycle()
89     */
90    public void recycle()
91    {
92      sn = -1;
93    }
94  
95    // ---------------------------------------------------------------------------
96    // Implementation of the serialization methods
97    // ---------------------------------------------------------------------------
98  
99    /**
100    * @see Externalizable#readExternal(ObjectInput)
101    */
102   public void readExternal(ObjectInput   in) throws IOException  ,
103       ClassNotFoundException  
104   {
105     sn = in.readLong();
106   }
107 
108   /**
109    * @see Externalizable#writeExternal(ObjectOutput)
110    */
111   public void writeExternal(ObjectOutput   out) throws IOException  
112   {
113     out.writeLong(sn);
114   }
115 
116 }
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