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1   /*
2    * $Id: MemoryPersistenceStrategy.java 7976 2007-08-21 14:26:13Z dirk.olmes $
3    * --------------------------------------------------------------------------------------
4    * Copyright (c) MuleSource, Inc.  All rights reserved.  http://www.mulesource.com
5    *
6    * The software in this package is published under the terms of the CPAL v1.0
7    * license, a copy of which has been included with this distribution in the
8    * LICENSE.txt file.
9    */
10  
11  package org.mule.util.queue;
12  
13  import java.io.IOException;
14  import java.util.ArrayList;
15  import java.util.Collections;
16  import java.util.HashMap;
17  import java.util.List;
18  import java.util.Map;
19  
20  import org.safehaus.uuid.UUIDGenerator;
21  
22  /**
23   * @author <a href="mailto:gnt@codehaus.org">Guillaume Nodet</a>
24   * @version $Revision: 7976 $
25   */
26  public class MemoryPersistenceStrategy implements QueuePersistenceStrategy
27  {
28  
29      private UUIDGenerator gen = UUIDGenerator.getInstance();
30  
31      private Map map = Collections.synchronizedMap(new HashMap());
32  
33      protected Object getId(Object obj)
34      {
35          return gen.generateRandomBasedUUID();
36      }
37  
38      /*
39       * (non-Javadoc)
40       * 
41       * @see org.mule.transaction.xa.queue.QueuePersistenceStrategy#store(java.lang.Object)
42       */
43      public Object store(String queue, Object obj) throws IOException
44      {
45          if (obj == null)
46          {
47              throw new IllegalArgumentException("Cannot store null object.");
48          }
49          Object id = getId(obj);
50          map.put(id, obj);
51          return id;
52      }
53  
54      /*
55       * (non-Javadoc)
56       * 
57       * @see org.mule.transaction.xa.queue.QueuePersistenceStrategy#load(java.lang.Object)
58       */
59      public Object load(String queue, Object id) throws IOException
60      {
61          return map.get(id);
62      }
63  
64      /*
65       * (non-Javadoc)
66       * 
67       * @see org.mule.transaction.xa.queue.QueuePersistenceStrategy#remove(java.lang.Object)
68       */
69      public void remove(String queue, Object id) throws IOException
70      {
71          map.remove(id);
72      }
73  
74      /*
75       * (non-Javadoc)
76       * 
77       * @see org.mule.transaction.xa.queue.QueuePersistenceStrategy#restore()
78       */
79      public List restore() throws IOException
80      {
81          return new ArrayList();
82      }
83  
84      /*
85       * (non-Javadoc)
86       * 
87       * @see org.mule.transaction.xa.queue.QueuePersistenceStrategy#open()
88       */
89      public void open() throws IOException
90      {
91          // nothing to do
92      }
93  
94      /*
95       * (non-Javadoc)
96       * 
97       * @see org.mule.transaction.xa.queue.QueuePersistenceStrategy#close()
98       */
99      public void close() throws IOException
100     {
101         // nothing to do
102     }
103 
104     public boolean isTransient()
105     {
106         return true;
107     }
108 }