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 */
017package org.apache.activemq.broker.region;
018
019import java.io.IOException;
020import java.util.List;
021
022import javax.jms.JMSException;
023
024import org.apache.activemq.broker.region.group.MessageGroupMap;
025import org.apache.activemq.broker.region.policy.SimpleDispatchSelector;
026import org.apache.activemq.command.ActiveMQDestination;
027import org.apache.activemq.command.ActiveMQMessage;
028import org.apache.activemq.command.ConsumerId;
029import org.apache.activemq.command.Message;
030import org.slf4j.Logger;
031import org.slf4j.LoggerFactory;
032
033/**
034 * Queue dispatch policy that determines if a message can be sent to a subscription
035 * 
036 * @org.apache.xbean.XBean
037 * 
038 */
039public class QueueDispatchSelector extends SimpleDispatchSelector {
040    private static final Logger LOG = LoggerFactory.getLogger(QueueDispatchSelector.class);
041    private Subscription exclusiveConsumer;
042   
043   
044    /**
045     * @param destination
046     */
047    public QueueDispatchSelector(ActiveMQDestination destination) {
048        super(destination);
049    }
050    
051    public Subscription getExclusiveConsumer() {
052        return exclusiveConsumer;
053    }
054    public void setExclusiveConsumer(Subscription exclusiveConsumer) {
055        this.exclusiveConsumer = exclusiveConsumer;
056    }
057    
058    public boolean isExclusiveConsumer(Subscription s) {
059        return s == this.exclusiveConsumer;
060    }
061    
062       
063    public boolean canSelect(Subscription subscription,
064            MessageReference m) throws Exception {
065       
066        boolean result =  super.canDispatch(subscription, m);
067        if (result && !subscription.isBrowser()) {
068            result = exclusiveConsumer == null || exclusiveConsumer == subscription;
069        }
070        return result;
071    }
072    
073}