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 037import javax.jms.ResourceAllocationException; 038 039/** 040 * A Destination which implements <a href="http://activemq.org/site/virtual-destinations.html">Virtual Topic</a> 041 */ 042public class VirtualTopicInterceptor extends DestinationFilter { 043 044 private final String prefix; 045 private final String postfix; 046 private final boolean local; 047 private final boolean concurrentSend; 048 private final boolean transactedSend; 049 private final boolean dropMessageOnResourceLimit; 050 051 private final LRUCache<ActiveMQDestination, ActiveMQQueue> cache = new LRUCache<ActiveMQDestination, ActiveMQQueue>(); 052 053 public VirtualTopicInterceptor(Destination next, VirtualTopic virtualTopic) { 054 super(next); 055 this.prefix = virtualTopic.getPrefix(); 056 this.postfix = virtualTopic.getPostfix(); 057 this.local = virtualTopic.isLocal(); 058 this.concurrentSend = virtualTopic.isConcurrentSend(); 059 this.transactedSend = virtualTopic.isTransactedSend(); 060 this.dropMessageOnResourceLimit = virtualTopic.isDropOnResourceLimit(); 061 } 062 063 public Topic getTopic() { 064 return (Topic) this.next; 065 } 066 067 @Override 068 public void send(ProducerBrokerExchange context, Message message) throws Exception { 069 if (!message.isAdvisory() && !(local && message.getBrokerPath() != null)) { 070 ActiveMQDestination queueConsumers = getQueueConsumersWildcard(message.getDestination()); 071 send(context, message, queueConsumers); 072 } 073 super.send(context, message); 074 } 075 076 @Override 077 protected void send(final ProducerBrokerExchange context, final Message message, ActiveMQDestination destination) throws Exception { 078 final Broker broker = context.getConnectionContext().getBroker(); 079 final Set<Destination> destinations = broker.getDestinations(destination); 080 final int numDestinations = destinations.size(); 081 082 final LocalTransactionId localBrokerTransactionToCoalesceJournalSync = 083 beginLocalTransaction(numDestinations, context.getConnectionContext(), message); 084 try { 085 if (concurrentSend && numDestinations > 1) { 086 087 final CountDownLatch concurrent = new CountDownLatch(destinations.size()); 088 final AtomicReference<Exception> exceptionAtomicReference = new AtomicReference<Exception>(); 089 final BrokerService brokerService = broker.getBrokerService(); 090 091 for (final Destination dest : destinations) { 092 if (shouldDispatch(broker, message, dest)) { 093 brokerService.getTaskRunnerFactory().execute(new Runnable() { 094 @Override 095 public void run() { 096 try { 097 if (exceptionAtomicReference.get() == null) { 098 dest.send(context, copy(message, dest.getActiveMQDestination())); 099 } 100 } catch (ResourceAllocationException e) { 101 if (!dropMessageOnResourceLimit) { 102 exceptionAtomicReference.set(e); 103 } 104 } catch (Exception e) { 105 exceptionAtomicReference.set(e); 106 } finally { 107 concurrent.countDown(); 108 } 109 } 110 }); 111 } else { 112 concurrent.countDown(); 113 } 114 } 115 concurrent.await(); 116 if (exceptionAtomicReference.get() != null) { 117 throw exceptionAtomicReference.get(); 118 } 119 120 } else { 121 for (final Destination dest : destinations) { 122 if (shouldDispatch(broker, message, dest)) { 123 try { 124 dest.send(context, copy(message, dest.getActiveMQDestination())); 125 } catch (ResourceAllocationException e) { 126 if (!dropMessageOnResourceLimit) { 127 throw e; 128 } 129 } 130 } 131 } 132 } 133 } finally { 134 commit(localBrokerTransactionToCoalesceJournalSync, context.getConnectionContext(), message); 135 } 136 } 137 138 private Message copy(Message original, ActiveMQDestination target) { 139 Message msg = original.copy(); 140 msg.setDestination(target); 141 msg.setOriginalDestination(original.getDestination()); 142 return msg; 143 } 144 145 private LocalTransactionId beginLocalTransaction(int numDestinations, ConnectionContext connectionContext, Message message) throws Exception { 146 LocalTransactionId result = null; 147 if (transactedSend && numDestinations > 1 && message.isPersistent() && message.getTransactionId() == null) { 148 result = new LocalTransactionId(new ConnectionId(message.getMessageId().getProducerId().toString()), message.getMessageId().getProducerSequenceId()); 149 connectionContext.getBroker().beginTransaction(connectionContext, result); 150 connectionContext.setTransaction(connectionContext.getTransactions().get(result)); 151 message.setTransactionId(result); 152 } 153 return result; 154 } 155 156 private void commit(LocalTransactionId tx, ConnectionContext connectionContext, Message message) throws Exception { 157 if (tx != null) { 158 connectionContext.getBroker().commitTransaction(connectionContext, tx, true); 159 connectionContext.getTransactions().remove(tx); 160 connectionContext.setTransaction(null); 161 message.setTransactionId(null); 162 } 163 } 164 165 protected boolean shouldDispatch(Broker broker, Message message, Destination dest) throws IOException { 166 return true; 167 } 168 169 protected ActiveMQDestination getQueueConsumersWildcard(ActiveMQDestination original) { 170 ActiveMQQueue queue; 171 synchronized (cache) { 172 queue = cache.get(original); 173 if (queue == null) { 174 queue = new ActiveMQQueue(prefix + original.getPhysicalName() + postfix); 175 cache.put(original, queue); 176 } 177 } 178 return queue; 179 } 180}