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 */
017 package org.apache.activemq.broker.region.virtual;
018
019 import java.util.ArrayList;
020 import java.util.Iterator;
021 import java.util.List;
022 import java.util.Set;
023
024 import org.apache.activemq.broker.Broker;
025 import org.apache.activemq.broker.ConnectionContext;
026 import org.apache.activemq.broker.ProducerBrokerExchange;
027 import org.apache.activemq.broker.region.Destination;
028 import org.apache.activemq.broker.region.DestinationFilter;
029 import org.apache.activemq.broker.region.DestinationInterceptor;
030 import org.apache.activemq.command.ActiveMQDestination;
031 import org.apache.activemq.command.Message;
032 import org.apache.activemq.filter.DestinationMap;
033
034 /**
035 * Implements <a
036 * href="http://activemq.apache.org/virtual-destinations.html">Virtual Topics</a>.
037 *
038 * @org.apache.xbean.XBean
039 *
040 */
041 public class VirtualDestinationInterceptor implements DestinationInterceptor {
042
043 private DestinationMap destinationMap = new DestinationMap();
044 private VirtualDestination[] virtualDestinations;
045
046 public Destination intercept(Destination destination) {
047 Set matchingDestinations = destinationMap.get(destination.getActiveMQDestination());
048 List<Destination> destinations = new ArrayList<Destination>();
049 for (Iterator iter = matchingDestinations.iterator(); iter.hasNext();) {
050 VirtualDestination virtualDestination = (VirtualDestination)iter.next();
051 Destination newDestination = virtualDestination.intercept(destination);
052 destinations.add(newDestination);
053 }
054 if (!destinations.isEmpty()) {
055 if (destinations.size() == 1) {
056 return destinations.get(0);
057 } else {
058 // should rarely be used but here just in case
059 return createCompositeDestination(destination, destinations);
060 }
061 }
062 return destination;
063 }
064
065
066 public synchronized void create(Broker broker, ConnectionContext context, ActiveMQDestination destination) throws Exception {
067 for (VirtualDestination virt: virtualDestinations) {
068 virt.create(broker, context, destination);
069 }
070 }
071
072 public synchronized void remove(Destination destination) {
073 }
074
075 public VirtualDestination[] getVirtualDestinations() {
076 return virtualDestinations;
077 }
078
079 public void setVirtualDestinations(VirtualDestination[] virtualDestinations) {
080 destinationMap = new DestinationMap();
081 this.virtualDestinations = virtualDestinations;
082 for (int i = 0; i < virtualDestinations.length; i++) {
083 VirtualDestination virtualDestination = virtualDestinations[i];
084 destinationMap.put(virtualDestination.getVirtualDestination(), virtualDestination);
085 }
086 }
087
088 protected Destination createCompositeDestination(Destination destination, final List<Destination> destinations) {
089 return new DestinationFilter(destination) {
090 public void send(ProducerBrokerExchange context, Message messageSend) throws Exception {
091 for (Iterator<Destination> iter = destinations.iterator(); iter.hasNext();) {
092 Destination destination = iter.next();
093 destination.send(context, messageSend);
094 }
095 }
096 };
097 }
098
099 }