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1   /*** 
2    * 
3    * Copyright 2004 Protique Ltd
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.service.impl;
19  
20  import org.apache.commons.logging.Log;
21  import org.apache.commons.logging.LogFactory;
22  import org.codehaus.activemq.message.ActiveMQMessage;
23  import org.codehaus.activemq.message.MessageAck;
24  import org.codehaus.activemq.service.MessageIdentity;
25  import org.codehaus.activemq.service.Subscription;
26  import org.codehaus.activemq.service.TopicMessageContainer;
27  import org.codehaus.activemq.store.TopicMessageStore;
28  
29  import javax.jms.JMSException;
30  
31  /***
32   * A default implemenation of a Durable Topic based
33   * {@link org.codehaus.activemq.service.MessageContainer}
34   * which acts as an adapter between the {@link org.codehaus.activemq.service.MessageContainerManager}
35   * requirements and those of the persistent {@link TopicMessageStore} implementations.
36   *
37   * @version $Revision: 1.13 $
38   */
39  public class DurableTopicMessageContainer implements TopicMessageContainer {
40      private static final Log log = LogFactory.getLog(DurableTopicMessageContainer.class);
41  
42      private TopicMessageStore messageStore;
43      private String destinationName;
44      private MessageIdentity lastMessageIdentity;
45  
46      public DurableTopicMessageContainer(TopicMessageStore messageStore, String destinationName) {
47          this.messageStore = messageStore;
48          this.destinationName = destinationName;
49      }
50  
51      public String getDestinationName() {
52          return destinationName;
53      }
54  
55      public MessageIdentity addMessage(ActiveMQMessage message) throws JMSException {
56          MessageIdentity answer = messageStore.addMessage(message);
57          lastMessageIdentity = answer;
58          return answer;
59      }
60  
61      public void delete(MessageIdentity messageID, MessageAck ack) throws JMSException {
62          // only called in MessagePointer and so shouldn't really delete
63          //messageStore.removeMessage(new MessageIdentity(messageID));
64      }
65  
66      public boolean containsMessage(MessageIdentity messageIdentity) throws JMSException {
67          /*** TODO: make more optimal implementation */
68          return getMessage(messageIdentity) != null;
69      }
70  
71      public ActiveMQMessage getMessage(MessageIdentity messageID) throws JMSException {
72          return messageStore.getMessage(messageID);
73      }
74  
75      public void registerMessageInterest(MessageIdentity messageIdentity) throws JMSException {
76          messageStore.incrementMessageCount(messageIdentity);
77      }
78  
79      public void unregisterMessageInterest(MessageIdentity messageIdentity, MessageAck ack) throws JMSException {
80          messageStore.decrementMessageCountAndMaybeDelete(messageIdentity, ack);
81      }
82  
83  
84      public void setLastAcknowledgedMessageID(Subscription subscription, MessageIdentity messageIdentity) throws JMSException {
85          messageStore.setLastAcknowledgedMessageIdentity(subscription, messageIdentity);
86      }
87  
88      public void recoverSubscription(Subscription subscription) throws JMSException {
89          messageStore.recoverSubscription(subscription, lastMessageIdentity);
90      }
91  
92  
93      public void start() throws JMSException {
94          messageStore.setMessageContainer(this);
95          lastMessageIdentity = messageStore.getLastestMessageIdentity();
96          messageStore.start();
97      }
98  
99      public void stop() throws JMSException {
100         messageStore.stop();
101     }
102 }