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 java.io.IOException; 020import java.util.Set; 021import java.util.concurrent.CountDownLatch; 022import java.util.concurrent.atomic.AtomicReference; 023import org.apache.activemq.broker.Broker; 024import org.apache.activemq.broker.BrokerService; 025import org.apache.activemq.broker.ConnectionContext; 026import org.apache.activemq.broker.ProducerBrokerExchange; 027import org.apache.activemq.broker.region.Destination; 028import org.apache.activemq.broker.region.DestinationFilter; 029import org.apache.activemq.broker.region.Topic; 030import org.apache.activemq.command.ActiveMQDestination; 031import org.apache.activemq.command.ActiveMQQueue; 032import org.apache.activemq.command.ConnectionId; 033import org.apache.activemq.command.LocalTransactionId; 034import org.apache.activemq.command.Message; 035import org.apache.activemq.util.LRUCache; 036 037/** 038 * A Destination which implements <a href="http://activemq.org/site/virtual-destinations.html">Virtual Topic</a> 039 */ 040public class VirtualTopicInterceptor extends DestinationFilter { 041 042 private final String prefix; 043 private final String postfix; 044 private final boolean local; 045 private final boolean concurrentSend; 046 private final boolean transactedSend; 047 048 private final LRUCache<ActiveMQDestination, ActiveMQQueue> cache = new LRUCache<ActiveMQDestination, ActiveMQQueue>(); 049 050 public VirtualTopicInterceptor(Destination next, VirtualTopic virtualTopic) { 051 super(next); 052 this.prefix = virtualTopic.getPrefix(); 053 this.postfix = virtualTopic.getPostfix(); 054 this.local = virtualTopic.isLocal(); 055 this.concurrentSend = virtualTopic.isConcurrentSend(); 056 this.transactedSend = virtualTopic.isTransactedSend(); 057 } 058 059 public Topic getTopic() { 060 return (Topic) this.next; 061 } 062 063 @Override 064 public void send(ProducerBrokerExchange context, Message message) throws Exception { 065 if (!message.isAdvisory() && !(local && message.getBrokerPath() != null)) { 066 ActiveMQDestination queueConsumers = getQueueConsumersWildcard(message.getDestination()); 067 send(context, message, queueConsumers); 068 } 069 super.send(context, message); 070 } 071 072 @Override 073 protected void send(final ProducerBrokerExchange context, final Message message, ActiveMQDestination destination) throws Exception { 074 final Broker broker = context.getConnectionContext().getBroker(); 075 final Set<Destination> destinations = broker.getDestinations(destination); 076 final int numDestinations = destinations.size(); 077 078 final LocalTransactionId localBrokerTransactionToCoalesceJournalSync = 079 beginLocalTransaction(numDestinations, context.getConnectionContext(), message); 080 try { 081 if (concurrentSend && numDestinations > 1) { 082 083 final CountDownLatch concurrent = new CountDownLatch(destinations.size()); 084 final AtomicReference<Exception> exceptionAtomicReference = new AtomicReference<Exception>(); 085 final BrokerService brokerService = broker.getBrokerService(); 086 087 for (final Destination dest : destinations) { 088 if (shouldDispatch(broker, message, dest)) { 089 brokerService.getTaskRunnerFactory().execute(new Runnable() { 090 @Override 091 public void run() { 092 try { 093 if (exceptionAtomicReference.get() == null) { 094 dest.send(context, copy(message, dest.getActiveMQDestination())); 095 } 096 } catch (Exception e) { 097 exceptionAtomicReference.set(e); 098 } finally { 099 concurrent.countDown(); 100 } 101 } 102 }); 103 } else { 104 concurrent.countDown(); 105 } 106 } 107 concurrent.await(); 108 if (exceptionAtomicReference.get() != null) { 109 throw exceptionAtomicReference.get(); 110 } 111 112 } else { 113 for (final Destination dest : destinations) { 114 if (shouldDispatch(broker, message, dest)) { 115 dest.send(context, copy(message, dest.getActiveMQDestination())); 116 } 117 } 118 } 119 } finally { 120 commit(localBrokerTransactionToCoalesceJournalSync, context.getConnectionContext(), message); 121 } 122 } 123 124 private Message copy(Message original, ActiveMQDestination target) { 125 Message msg = original.copy(); 126 msg.setDestination(target); 127 msg.setOriginalDestination(original.getDestination()); 128 return msg; 129 } 130 131 private LocalTransactionId beginLocalTransaction(int numDestinations, ConnectionContext connectionContext, Message message) throws Exception { 132 LocalTransactionId result = null; 133 if (transactedSend && numDestinations > 1 && message.isPersistent() && message.getTransactionId() == null) { 134 result = new LocalTransactionId(new ConnectionId(message.getMessageId().getProducerId().toString()), message.getMessageId().getProducerSequenceId()); 135 connectionContext.getBroker().beginTransaction(connectionContext, result); 136 connectionContext.setTransaction(connectionContext.getTransactions().get(result)); 137 message.setTransactionId(result); 138 } 139 return result; 140 } 141 142 private void commit(LocalTransactionId tx, ConnectionContext connectionContext, Message message) throws Exception { 143 if (tx != null) { 144 connectionContext.getBroker().commitTransaction(connectionContext, tx, true); 145 connectionContext.getTransactions().remove(tx); 146 connectionContext.setTransaction(null); 147 message.setTransactionId(null); 148 } 149 } 150 151 protected boolean shouldDispatch(Broker broker, Message message, Destination dest) throws IOException { 152 //if can't find .* in the prefix, default back to old logic and return true 153 return prefix.contains(".*") && !prefix.startsWith("*") ? dest.getName().startsWith(prefix.substring(0, prefix.indexOf(".*"))) : true; 154 } 155 156 protected ActiveMQDestination getQueueConsumersWildcard(ActiveMQDestination original) { 157 ActiveMQQueue queue; 158 synchronized (cache) { 159 queue = cache.get(original); 160 if (queue == null) { 161 queue = new ActiveMQQueue(prefix + original.getPhysicalName() + postfix); 162 cache.put(original, queue); 163 } 164 } 165 return queue; 166 } 167}