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.broker.BrokerClient;
23 import org.codehaus.activemq.filter.Filter;
24 import org.codehaus.activemq.message.ConsumerInfo;
25 import org.codehaus.activemq.message.MessageAck;
26 import org.codehaus.activemq.service.Dispatcher;
27 import org.codehaus.activemq.service.MessageContainer;
28 import org.codehaus.activemq.service.QueueListEntry;
29 import org.codehaus.activemq.service.TopicMessageContainer;
30 import org.codehaus.activemq.service.RedeliveryPolicy;
31
32 import javax.jms.JMSException;
33 import java.util.HashMap;
34 import java.util.Iterator;
35 import java.util.Map;
36
37 /***
38 * Represents a durable topic subscription where the consumer has a unique
39 * clientID used to persist the messages across both Broker restarts and
40 * JMS client restarts
41 *
42 * @version $Revision: 1.12 $
43 */
44 public class DurableTopicSubscription extends SubscriptionImpl {
45
46 private static final Log log = LogFactory.getLog(DurableTopicSubscription.class);
47
48 private String persistentKey;
49
50 public DurableTopicSubscription(Dispatcher dispatcher, BrokerClient client, ConsumerInfo info, Filter filter, RedeliveryPolicy redeliveryPolicy) {
51 super(dispatcher, client, info, filter, redeliveryPolicy);
52 }
53
54 public synchronized void messageConsumed(MessageAck ack) throws JMSException {
55 if (!ack.isMessageRead() && !isBrowser()) {
56 super.messageConsumed(ack);
57 }
58 else {
59 Map lastMessagePointersPerContainer = new HashMap();
60
61
62 boolean found = false;
63 QueueListEntry queueEntry = messagePtrs.getFirstEntry();
64 while (queueEntry != null) {
65 MessagePointer pointer = (MessagePointer) queueEntry.getElement();
66
67 messagePtrs.remove(queueEntry);
68 lastMessagePointersPerContainer.put(pointer.getContainer(), pointer);
69 unconsumedMessagesDispatched.decrement();
70
71 if (pointer.getMessageIdentity().equals(ack.getMessageIdentity())) {
72 found = true;
73 break;
74 }
75 queueEntry = messagePtrs.getNextEntry(queueEntry);
76 }
77 if (!found) {
78 log.warn("Did not find a matching message for identity: " + ack.getMessageIdentity());
79 }
80
81
82 for (Iterator iter = lastMessagePointersPerContainer.entrySet().iterator(); iter.hasNext();) {
83 Map.Entry entry = (Map.Entry) iter.next();
84 TopicMessageContainer container = (TopicMessageContainer) entry.getKey();
85 MessagePointer pointer = (MessagePointer) entry.getValue();
86 container.setLastAcknowledgedMessageID(this, pointer.getMessageIdentity());
87 }
88
89
90 dispatch.wakeup(this);
91 }
92 }
93
94 public synchronized void redeliverMessage(MessageContainer container, MessageAck ack) throws JMSException {
95
96 MessagePointer pointer = new MessagePointer(container, ack.getMessageIdentity());
97 pointer.setRedelivered(true);
98 messagePtrs.add(pointer);
99 unconsumedMessagesDispatched.increment();
100 }
101
102
103 public String getPersistentKey() {
104 if (persistentKey == null) {
105 persistentKey = "[" + getClientId() + ":" + getSubscriberName() + "]";
106 }
107 return persistentKey;
108 }
109 }