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.virtual; 018 019import org.apache.activemq.broker.ProducerBrokerExchange; 020import org.apache.activemq.broker.region.Destination; 021import org.apache.activemq.broker.region.DestinationFilter; 022import org.apache.activemq.command.ActiveMQDestination; 023import org.apache.activemq.command.ActiveMQQueue; 024import org.apache.activemq.command.Message; 025import org.apache.activemq.util.LRUCache; 026 027/** 028 * A Destination which implements <a 029 * href="http://activemq.org/site/virtual-destinations.html">Virtual Topic</a> 030 * 031 * 032 */ 033public class VirtualTopicInterceptor extends DestinationFilter { 034 035 private String prefix; 036 private String postfix; 037 private boolean local; 038 private LRUCache<ActiveMQDestination,ActiveMQQueue> cache = new LRUCache<ActiveMQDestination,ActiveMQQueue>(); 039 040 public VirtualTopicInterceptor(Destination next, String prefix, String postfix, boolean local) { 041 super(next); 042 this.prefix = prefix; 043 this.postfix = postfix; 044 this.local = local; 045 } 046 047 public void send(ProducerBrokerExchange context, Message message) throws Exception { 048 if (!message.isAdvisory() && !(local && message.getBrokerPath() != null)) { 049 ActiveMQDestination queueConsumers = getQueueConsumersWildcard(message.getDestination()); 050 send(context, message, queueConsumers); 051 } 052 super.send(context, message); 053 } 054 055 protected ActiveMQDestination getQueueConsumersWildcard(ActiveMQDestination original) { 056 ActiveMQQueue queue; 057 synchronized(cache){ 058 queue = cache.get(original); 059 if (queue==null){ 060 queue = new ActiveMQQueue(prefix + original.getPhysicalName() + postfix); 061 cache.put(original,queue); 062 } 063 } 064 return queue; 065 } 066}