/**
*
* Copyright 2004 Protique Ltd
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
**/
package org.codehaus.activemq.store.vm;
import java.util.Collections;
import java.util.HashMap;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.Map;
import javax.jms.JMSException;
import org.codehaus.activemq.message.ActiveMQMessage;
import org.codehaus.activemq.message.ConsumerInfo;
import org.codehaus.activemq.service.MessageContainer;
import org.codehaus.activemq.service.MessageIdentity;
import org.codehaus.activemq.service.SubscriberEntry;
import org.codehaus.activemq.service.Subscription;
import org.codehaus.activemq.store.TopicMessageStore;
/**
* @version $Revision: 1.6 $
*/
public class VMTopicMessageStore extends VMMessageStore implements TopicMessageStore {
private static final Integer ONE = new Integer(1);
private Map ackDatabase;
private Map messageCounts;
private Map subscriberDatabase;
private MessageContainer container;
public VMTopicMessageStore() {
this(new LinkedHashMap(), makeMap(), makeMap(), makeMap());
}
public VMTopicMessageStore(LinkedHashMap messageTable, Map subscriberDatabase, Map ackDatabase, Map messageCounts) {
super(messageTable);
this.subscriberDatabase = subscriberDatabase;
this.ackDatabase = ackDatabase;
this.messageCounts = messageCounts;
}
public void setMessageContainer(MessageContainer container) {
this.container = container;
}
public synchronized void incrementMessageCount(MessageIdentity messageId) throws JMSException {
Integer number = (Integer) messageCounts.get(messageId.getMessageID());
if (number == null) {
number = ONE;
}
else {
number = new Integer(number.intValue() + 1);
}
messageCounts.put(messageId.getMessageID(), number);
}
public synchronized void decrementMessageCountAndMaybeDelete(MessageIdentity msgId) throws JMSException {
Integer number = (Integer) messageCounts.get(msgId.getMessageID());
if (number == null || number.intValue() <= 1) {
removeMessage(msgId);
if (number != null) {
messageCounts.remove(msgId.getMessageID());
}
}
else {
messageCounts.put(msgId.getMessageID(), new Integer(number.intValue() - 1));
number = ONE;
}
}
public void setLastAcknowledgedMessageIdentity(String subscription, MessageIdentity messageIdentity) throws JMSException {
ackDatabase.put(subscription, messageIdentity);
}
public synchronized void recoverSubscription(Subscription subscription, MessageIdentity lastDispatchedMessage) throws JMSException {
//iterate through the message table and populate the subscriber
Map map = new HashMap(messageTable);
boolean alreadyAcked = true;
MessageIdentity lastAcked = (MessageIdentity)ackDatabase.get(subscription.getPersistentKey());
for (Iterator i = map.values().iterator(); i.hasNext(); ){
ActiveMQMessage msg = (ActiveMQMessage)i.next();
if (lastAcked == null || !alreadyAcked){
subscription.addMessage(container, msg);
}
if (lastAcked != null){
if (lastAcked.getMessageID().equals(msg.getJMSMessageID())){
alreadyAcked = false;
}
}
}
}
public MessageIdentity getLastestMessageIdentity() throws JMSException {
return super.lastMessageIdentity;
}
public SubscriberEntry getSubscriberEntry(ConsumerInfo info) throws JMSException {
Object key = info.getConsumerKey();
return (SubscriberEntry) subscriberDatabase.get(key);
}
public void setSubscriberEntry(ConsumerInfo info, SubscriberEntry subscriberEntry) throws JMSException {
subscriberDatabase.put(info.getConsumerKey(), subscriberEntry);
}
public void stop() throws JMSException {
}
protected static Map makeMap() {
return Collections.synchronizedMap(new HashMap());
}
public void deleteSubscription(String sub) {
ackDatabase.remove(sub);
}
}