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1   /*** 
2    * 
3    * Copyright 2004 Hiram Chirino
4    * 
5    * Licensed under the Apache License, Version 2.0 (the "License"); 
6    * you may not use this file except in compliance with the License. 
7    * You may obtain a copy of the License at 
8    * 
9    * http://www.apache.org/licenses/LICENSE-2.0
10   * 
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS, 
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
14   * See the License for the specific language governing permissions and 
15   * limitations under the License. 
16   * 
17   **/
18  package org.codehaus.activemq.store.cache;
19  
20  import java.io.IOException;
21  import java.util.Map;
22  
23  import javax.jms.JMSException;
24  
25  import org.apache.commons.logging.Log;
26  import org.apache.commons.logging.LogFactory;
27  import org.codehaus.activemq.service.impl.PersistenceAdapterSupport;
28  import org.codehaus.activemq.store.MessageStore;
29  import org.codehaus.activemq.store.PersistenceAdapter;
30  import org.codehaus.activemq.store.PreparedTransactionStore;
31  import org.codehaus.activemq.store.TopicMessageStore;
32  
33  /***
34   * Implements a {@link PersistenceAdapter} designed to
35   * to speed up access to recently added messages by using
36   * a MessageCache .
37   *
38   * @version $Revision: 1.2 $
39   */
40  public abstract class CachePersistenceAdapter extends PersistenceAdapterSupport {
41  
42      private static final Log log = LogFactory.getLog(CachePersistenceAdapter.class);
43      private PersistenceAdapter longTermPersistence;    
44  
45      public CachePersistenceAdapter() {
46      }
47      
48      public CachePersistenceAdapter(PersistenceAdapter longTermPersistence) throws IOException {
49  		this.longTermPersistence = longTermPersistence;
50      }
51  
52      public Map getInitialDestinations() {
53          return longTermPersistence.getInitialDestinations();
54      }
55  
56      public MessageStore createQueueMessageStore(String destinationName) throws JMSException {
57          MessageStore longtermStore = longTermPersistence.createQueueMessageStore(destinationName);
58          CacheMessageStore store = new CacheMessageStore(this, longtermStore, createMessageCache(destinationName));
59          return store;
60      }
61  
62  	public TopicMessageStore createTopicMessageStore(String destinationName) throws JMSException {
63      	TopicMessageStore longtermStore = longTermPersistence.createTopicMessageStore(destinationName);
64          CacheTopicMessageStore store = new CacheTopicMessageStore(this, longtermStore, new SimpleMessageCache());
65          return store;
66      }
67  
68      public PreparedTransactionStore createPreparedTransactionStore() throws JMSException {
69          return longTermPersistence.createPreparedTransactionStore();
70      }
71  
72      public void beginTransaction() throws JMSException {
73      	longTermPersistence.beginTransaction();
74      }
75  
76      public void commitTransaction() throws JMSException {
77      	longTermPersistence.commitTransaction();
78      }
79  
80      public void rollbackTransaction() {
81      	longTermPersistence.rollbackTransaction();
82      }
83  
84      public void start() throws JMSException {
85          longTermPersistence.start();
86      }
87  
88  	public void stop() throws JMSException {
89          longTermPersistence.stop();
90      }
91  	
92      // Properties
93      //-------------------------------------------------------------------------
94      public PersistenceAdapter getLongTermPersistence() {
95          return longTermPersistence;
96      }
97      
98      public void setLongTermPersistence(PersistenceAdapter longTermPersistence) {
99          this.longTermPersistence = longTermPersistence;
100     }
101 
102     /***
103      * Subclasses should override this method to change the type 
104      * of MessageCache that is used to cache messages.
105      *  
106      * @param destinationName
107      * @return
108      */
109 	abstract protected MessageCache createMessageCache(String destinationName);
110 
111 }