001    /**
002     * Licensed to the Apache Software Foundation (ASF) under one or more
003     * contributor license agreements.  See the NOTICE file distributed with
004     * this work for additional information regarding copyright ownership.
005     * The ASF licenses this file to You under the Apache License, Version 2.0
006     * (the "License"); you may not use this file except in compliance with
007     * the License.  You may obtain a copy of the License at
008     *
009     *      http://www.apache.org/licenses/LICENSE-2.0
010     *
011     * Unless required by applicable law or agreed to in writing, software
012     * distributed under the License is distributed on an "AS IS" BASIS,
013     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014     * See the License for the specific language governing permissions and
015     * limitations under the License.
016     */
017    package org.apache.activemq.broker.region;
018    
019    import java.util.Iterator;
020    import java.util.Set;
021    
022    import javax.jms.JMSException;
023    
024    import org.apache.activemq.broker.ConnectionContext;
025    import org.apache.activemq.broker.region.policy.PolicyEntry;
026    import org.apache.activemq.command.ActiveMQDestination;
027    import org.apache.activemq.command.ConsumerInfo;
028    import org.apache.activemq.command.MessageDispatchNotification;
029    import org.apache.activemq.thread.TaskRunnerFactory;
030    import org.apache.activemq.usage.SystemUsage;
031    
032    /**
033     * 
034     * 
035     */
036    public class QueueRegion extends AbstractRegion {
037    
038        public QueueRegion(RegionBroker broker, DestinationStatistics destinationStatistics,
039                           SystemUsage memoryManager, TaskRunnerFactory taskRunnerFactory,
040                           DestinationFactory destinationFactory) {
041            super(broker, destinationStatistics, memoryManager, taskRunnerFactory, destinationFactory);
042        }
043    
044        public String toString() {
045            return "QueueRegion: destinations=" + destinations.size() + ", subscriptions=" + subscriptions.size()
046                   + ", memory=" + usageManager.getMemoryUsage().getPercentUsage() + "%";
047        }
048    
049        protected Subscription createSubscription(ConnectionContext context, ConsumerInfo info)
050            throws JMSException {
051            ActiveMQDestination destination = info.getDestination();
052            PolicyEntry entry = null;
053            if (destination != null && broker.getDestinationPolicy() != null) {
054                entry = broker.getDestinationPolicy().getEntryFor(destination);
055                
056            }
057            if (info.isBrowser()) {
058                QueueBrowserSubscription sub = new QueueBrowserSubscription(broker,usageManager, context, info);
059                if (entry != null) {
060                    entry.configure(broker, usageManager, sub);
061                }
062                return sub;
063            } else {
064                QueueSubscription sub =   new QueueSubscription(broker, usageManager,context, info);
065                if (entry != null) {
066                    entry.configure(broker, usageManager, sub);
067                }
068                return sub;
069            }
070        }
071    
072        protected Set<ActiveMQDestination> getInactiveDestinations() {
073            Set<ActiveMQDestination> inactiveDestinations = super.getInactiveDestinations();
074            for (Iterator<ActiveMQDestination> iter = inactiveDestinations.iterator(); iter.hasNext();) {
075                ActiveMQDestination dest = iter.next();
076                if (!dest.isQueue()) {
077                    iter.remove();
078                }
079            }
080            return inactiveDestinations;
081        }
082        
083        /*
084         * For a Queue, dispatch order is imperative to match acks, so the dispatch is deferred till 
085         * the notification to ensure that the subscription chosen by the master is used.
086         * 
087         * (non-Javadoc)
088         * @see org.apache.activemq.broker.region.AbstractRegion#processDispatchNotification(org.apache.activemq.command.MessageDispatchNotification)
089         */
090        public void processDispatchNotification(MessageDispatchNotification messageDispatchNotification) throws Exception {
091            processDispatchNotificationViaDestination(messageDispatchNotification);
092        }
093    }