Source code: org/activemq/service/impl/DurableTopicSubscription.java
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.activemq.service.impl;
19
20 import java.util.HashMap;
21 import java.util.Iterator;
22 import java.util.Map;
23
24 import javax.jms.JMSException;
25
26 import org.apache.commons.logging.Log;
27 import org.apache.commons.logging.LogFactory;
28 import org.activemq.broker.BrokerClient;
29 import org.activemq.filter.Filter;
30 import org.activemq.message.ConsumerInfo;
31 import org.activemq.message.MessageAck;
32 import org.activemq.service.DeadLetterPolicy;
33 import org.activemq.service.Dispatcher;
34 import org.activemq.service.QueueListEntry;
35 import org.activemq.service.RedeliveryPolicy;
36 import org.activemq.service.TopicMessageContainer;
37 import org.activemq.service.TransactionManager;
38 import org.activemq.service.TransactionTask;
39
40 /**
41 * Represents a durable topic subscription where the consumer has a unique
42 * clientID used to persist the messages across both Broker restarts and
43 * JMS client restarts
44 *
45 * @version $Revision: 1.1.1.1 $
46 */
47 public class DurableTopicSubscription extends SubscriptionImpl {
48
49 private static final Log log = LogFactory.getLog(DurableTopicSubscription.class);
50
51 private String persistentKey;
52
53 public DurableTopicSubscription(Dispatcher dispatcher, BrokerClient client, ConsumerInfo info, Filter filter, RedeliveryPolicy redeliveryPolicy,DeadLetterPolicy deadLetterPolicy) {
54 super(dispatcher, client, info, filter, redeliveryPolicy,deadLetterPolicy);
55 }
56
57 public synchronized void messageConsumed(MessageAck ack) throws JMSException {
58 if (ack.isExpired() || (!ack.isMessageRead() && !isBrowser())) {
59 super.messageConsumed(ack);
60 }
61 else {
62 final Map lastMessagePointersPerContainer = new HashMap();
63
64 //remove up to this message
65 boolean found = false;
66 QueueListEntry queueEntry = messagePtrs.getFirstEntry();
67 while (queueEntry != null) {
68 final MessagePointer pointer = (MessagePointer) queueEntry.getElement();
69
70 messagePtrs.remove(queueEntry);
71 lastMessagePointersPerContainer.put(pointer.getContainer(), pointer);
72 unconsumedMessagesDispatched.decrement();
73
74 TransactionManager.getContexTransaction().addPostRollbackTask(new TransactionTask(){
75 public void execute() throws Throwable {
76 unconsumedMessagesDispatched.increment();
77 MessagePointer p = new MessagePointer(pointer);
78 p.setRedelivered(true);
79 messagePtrs.add(p);
80 dispatch.wakeup(DurableTopicSubscription.this);
81 lastMessageIdentity = pointer.getMessageIdentity();
82 }
83 });
84
85 TransactionManager.getContexTransaction().addPostCommitTask(new TransactionTask(){
86 public void execute() throws Throwable {
87 // now lets tell each container to update its lastAcknowlegedMessageID
88 for (Iterator iter = lastMessagePointersPerContainer.entrySet().iterator(); iter.hasNext();) {
89 Map.Entry entry = (Map.Entry) iter.next();
90 TopicMessageContainer container = (TopicMessageContainer) entry.getKey();
91 MessagePointer pointer = (MessagePointer) entry.getValue();
92 container.setLastAcknowledgedMessageID(DurableTopicSubscription.this, pointer.getMessageIdentity());
93 }
94 }
95 });
96
97 if (pointer.getMessageIdentity().equals(ack.getMessageIdentity())) {
98 found = true;
99 break;
100 }
101 queueEntry = messagePtrs.getNextEntry(queueEntry);
102 }
103 if (!found) {
104 log.warn("Did not find a matching message for identity: " + ack.getMessageIdentity());
105 }
106 //System.out.println("Message consumed. Remaining: " + messagePtrs.size() + " unconsumedMessagesDispatched: " + unconsumedMessagesDispatched.get());
107 dispatch.wakeup(this);
108 }
109 }
110
111 public String getPersistentKey() {
112 if (persistentKey == null) {
113 persistentKey = "[" + getClientId() + ":" + getSubscriberName() + "]";
114 }
115 return persistentKey;
116 }
117 }