View Javadoc

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.ConsumerInfo;
24  import org.codehaus.activemq.message.MessageAck;
25  import org.codehaus.activemq.service.MessageIdentity;
26  import org.codehaus.activemq.service.Subscription;
27  import org.codehaus.activemq.service.TopicMessageContainer;
28  import org.codehaus.activemq.store.TopicMessageStore;
29  
30  import javax.jms.JMSException;
31  
32  /***
33   * A default implemenation of a Durable Topic based
34   * {@link org.codehaus.activemq.service.MessageContainer}
35   * which acts as an adapter between the {@link org.codehaus.activemq.service.MessageContainerManager}
36   * requirements and those of the persistent {@link TopicMessageStore} implementations.
37   *
38   * @version $Revision: 1.14 $
39   */
40  public class DurableTopicMessageContainer implements TopicMessageContainer {
41      private static final Log log = LogFactory.getLog(DurableTopicMessageContainer.class);
42  
43      private TopicMessageStore messageStore;
44      private String destinationName;
45      private MessageIdentity lastMessageIdentity;
46  
47      public DurableTopicMessageContainer(TopicMessageStore messageStore, String destinationName) {
48          this.messageStore = messageStore;
49          this.destinationName = destinationName;
50      }
51  
52      public String getDestinationName() {
53          return destinationName;
54      }
55  
56      public MessageIdentity addMessage(ActiveMQMessage message) throws JMSException {
57          MessageIdentity answer = messageStore.addMessage(message);
58          lastMessageIdentity = answer;
59          return answer;
60      }
61  
62      public void delete(MessageIdentity messageID, MessageAck ack) throws JMSException {
63          // only called in MessagePointer and so shouldn't really delete
64          //messageStore.removeMessage(new MessageIdentity(messageID));
65      }
66  
67      public boolean containsMessage(MessageIdentity messageIdentity) throws JMSException {
68          /*** TODO: make more optimal implementation */
69          return getMessage(messageIdentity) != null;
70      }
71  
72      public ActiveMQMessage getMessage(MessageIdentity messageID) throws JMSException {
73          return messageStore.getMessage(messageID);
74      }
75  
76      public void registerMessageInterest(MessageIdentity messageIdentity) throws JMSException {
77          messageStore.incrementMessageCount(messageIdentity);
78      }
79  
80      public void unregisterMessageInterest(MessageIdentity messageIdentity, MessageAck ack) throws JMSException {
81          messageStore.decrementMessageCountAndMaybeDelete(messageIdentity, ack);
82      }
83  
84  
85      public void setLastAcknowledgedMessageID(Subscription subscription, MessageIdentity messageIdentity) throws JMSException {
86          messageStore.setLastAcknowledgedMessageIdentity(subscription, messageIdentity);
87      }
88  
89      public void recoverSubscription(Subscription subscription) throws JMSException {
90          messageStore.recoverSubscription(subscription, lastMessageIdentity);
91      }
92  
93      public void storeSubscription(ConsumerInfo info, Subscription subscription) throws JMSException {
94          messageStore.setSubscriberEntry(info, subscription.getSubscriptionEntry());
95      }
96  
97      public void start() throws JMSException {
98          messageStore.setMessageContainer(this);
99          lastMessageIdentity = messageStore.getLastestMessageIdentity();
100         messageStore.start();
101     }
102 
103     public void stop() throws JMSException {
104         messageStore.stop();
105     }
106 }