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.xbean; 018 019import java.util.HashMap; 020 021import org.apache.activemq.broker.BrokerService; 022import org.springframework.beans.factory.DisposableBean; 023import org.springframework.beans.factory.FactoryBean; 024import org.springframework.beans.factory.InitializingBean; 025import org.springframework.core.io.Resource; 026 027/** 028 * Used to share a single broker even if you have multiple broker bean 029 * definitions. A use case is where you have multiple web applications that want 030 * to start an embedded broker but only the first one to deploy should actually 031 * start it. 032 * 033 * 034 */ 035public class PooledBrokerFactoryBean implements FactoryBean, InitializingBean, DisposableBean { 036 037 static final HashMap<String, SharedBroker> SHARED_BROKER_MAP = new HashMap<String, SharedBroker>(); 038 039 private boolean start; 040 private Resource config; 041 042 static class SharedBroker { 043 BrokerFactoryBean factory; 044 int refCount; 045 } 046 047 public void afterPropertiesSet() throws Exception { 048 synchronized (SHARED_BROKER_MAP) { 049 SharedBroker sharedBroker = SHARED_BROKER_MAP.get(config.getFilename()); 050 if (sharedBroker == null) { 051 sharedBroker = new SharedBroker(); 052 sharedBroker.factory = new BrokerFactoryBean(); 053 sharedBroker.factory.setConfig(config); 054 sharedBroker.factory.setStart(start); 055 sharedBroker.factory.afterPropertiesSet(); 056 SHARED_BROKER_MAP.put(config.getFilename(), sharedBroker); 057 } 058 sharedBroker.refCount++; 059 } 060 } 061 062 public void destroy() throws Exception { 063 synchronized (SHARED_BROKER_MAP) { 064 SharedBroker sharedBroker = SHARED_BROKER_MAP.get(config.getFilename()); 065 if (sharedBroker != null) { 066 sharedBroker.refCount--; 067 if (sharedBroker.refCount == 0) { 068 sharedBroker.factory.destroy(); 069 SHARED_BROKER_MAP.remove(config.getFilename()); 070 } 071 } 072 } 073 } 074 075 public Resource getConfig() { 076 return config; 077 } 078 079 public Object getObject() throws Exception { 080 synchronized (SHARED_BROKER_MAP) { 081 SharedBroker sharedBroker = SHARED_BROKER_MAP.get(config.getFilename()); 082 if (sharedBroker != null) { 083 return sharedBroker.factory.getObject(); 084 } 085 } 086 return null; 087 } 088 089 public Class getObjectType() { 090 return BrokerService.class; 091 } 092 093 public boolean isSingleton() { 094 return true; 095 } 096 097 public boolean isStart() { 098 return start; 099 } 100 101 public void setConfig(Resource config) { 102 this.config = config; 103 } 104 105 public void setStart(boolean start) { 106 this.start = start; 107 } 108 109}