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.Broker; 020import org.apache.activemq.broker.ConnectionContext; 021import org.apache.activemq.broker.region.Destination; 022import org.apache.activemq.command.ActiveMQDestination; 023import org.apache.activemq.command.ActiveMQQueue; 024import org.apache.activemq.command.ActiveMQTopic; 025import org.apache.activemq.filter.DestinationFilter; 026 027/** 028 * Creates <a href="http://activemq.org/site/virtual-destinations.html">Virtual 029 * Topics</a> using a prefix and postfix. The virtual destination creates a 030 * wildcard that is then used to look up all active queue subscriptions which 031 * match. 032 * 033 * @org.apache.xbean.XBean 034 * 035 * 036 */ 037public class VirtualTopic implements VirtualDestination { 038 039 private String prefix = "Consumer.*."; 040 private String postfix = ""; 041 private String name = ">"; 042 private boolean selectorAware = false; 043 044 045 public ActiveMQDestination getVirtualDestination() { 046 return new ActiveMQTopic(getName()); 047 } 048 049 public Destination intercept(Destination destination) { 050 return selectorAware ? new SelectorAwareVirtualTopicInterceptor(destination, getPrefix(), getPostfix()) : 051 new VirtualTopicInterceptor(destination, getPrefix(), getPostfix()); 052 } 053 054 055 public void create(Broker broker, ConnectionContext context, ActiveMQDestination destination) throws Exception { 056 if (destination.isQueue() && destination.isPattern() && broker.getDestinations(destination).isEmpty()) { 057 DestinationFilter filter = DestinationFilter.parseFilter(new ActiveMQQueue(prefix + DestinationFilter.ANY_DESCENDENT)); 058 if (filter.matches(destination)) { 059 broker.addDestination(context, destination, false); 060 } 061 } 062 } 063 064 public void remove(Destination destination) { 065 } 066 067 // Properties 068 // ------------------------------------------------------------------------- 069 070 public String getPostfix() { 071 return postfix; 072 } 073 074 /** 075 * Sets any postix used to identify the queue consumers 076 */ 077 public void setPostfix(String postfix) { 078 this.postfix = postfix; 079 } 080 081 public String getPrefix() { 082 return prefix; 083 } 084 085 /** 086 * Sets the prefix wildcard used to identify the queue consumers for a given 087 * topic 088 */ 089 public void setPrefix(String prefix) { 090 this.prefix = prefix; 091 } 092 093 public String getName() { 094 return name; 095 } 096 097 public void setName(String name) { 098 this.name = name; 099 } 100 101 /** 102 * Indicates whether the selectors of consumers are used to determine dispatch 103 * to a virtual destination, when true only messages matching an existing 104 * consumer will be dispatched. 105 * @param selectorAware when true take consumer selectors into consideration 106 */ 107 public void setSelectorAware(boolean selectorAware) { 108 this.selectorAware = selectorAware; 109 } 110 111 public boolean isSelectorAware() { 112 return selectorAware; 113 } 114}