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}