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.util.ArrayList; 020import java.util.Iterator; 021import java.util.List; 022import java.util.Set; 023 024import org.apache.activemq.broker.Broker; 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.DestinationInterceptor; 030import org.apache.activemq.command.ActiveMQDestination; 031import org.apache.activemq.command.Message; 032import 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 */ 041public class VirtualDestinationInterceptor implements DestinationInterceptor { 042 043 private DestinationMap destinationMap = new DestinationMap(); 044 private VirtualDestination[] virtualDestinations; 045 046 public synchronized Destination intercept(Destination destination) { 047 Set virtualDestinations = destinationMap.get(destination.getActiveMQDestination()); 048 List<Destination> destinations = new ArrayList<Destination>(); 049 for (Iterator iter = virtualDestinations.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}