content: /**
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements.  See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF licenses this file to You under the Apache License, Version 2.0
   * (the "License"); you may not use this file except in compliance with
   * the License.  You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package org.apache.activemq.xbean;
  
  import java.util.HashMap;
  
  import org.apache.activemq.broker.BrokerService;
  import org.springframework.beans.factory.DisposableBean;
  import org.springframework.beans.factory.FactoryBean;
  import org.springframework.beans.factory.InitializingBean;
  import org.springframework.core.io.Resource;
  
  /**
   * Used to share a single broker even if you have multiple broker bean
   * definitions. A use case is where you have multiple web applications that want
   * to start an embedded broker but only the first one to deploy should actually
   * start it.
   * 
   * 
   */
  public class PooledBrokerFactoryBean implements FactoryBean, InitializingBean, DisposableBean {
  
      static final HashMap<String, SharedBroker> SHARED_BROKER_MAP = new HashMap<String, SharedBroker>();
  
      private boolean start;
      private Resource config;
  
      static class SharedBroker {
          BrokerFactoryBean factory;
          int refCount;
      }
  
      public void afterPropertiesSet() throws Exception {
          synchronized (SHARED_BROKER_MAP) {
              SharedBroker sharedBroker = SHARED_BROKER_MAP.get(config.getFilename());
              if (sharedBroker == null) {
                  sharedBroker = new SharedBroker();
                  sharedBroker.factory = new BrokerFactoryBean();
                  sharedBroker.factory.setConfig(config);
                  sharedBroker.factory.setStart(start);
                  sharedBroker.factory.afterPropertiesSet();
                  SHARED_BROKER_MAP.put(config.getFilename(), sharedBroker);
              }
              sharedBroker.refCount++;
          }
      }
  
      public void destroy() throws Exception {
          synchronized (SHARED_BROKER_MAP) {
              SharedBroker sharedBroker = SHARED_BROKER_MAP.get(config.getFilename());
              if (sharedBroker != null) {
                  sharedBroker.refCount--;
                  if (sharedBroker.refCount == 0) {
                      sharedBroker.factory.destroy();
                      SHARED_BROKER_MAP.remove(config.getFilename());
                  }
              }
          }
      }
  
      public Resource getConfig() {
          return config;
      }
  
      public Object getObject() throws Exception {
          synchronized (SHARED_BROKER_MAP) {
              SharedBroker sharedBroker = SHARED_BROKER_MAP.get(config.getFilename());
              if (sharedBroker != null) {
                  return sharedBroker.factory.getObject();
              }
          }
          return null;
      }
  
      public Class getObjectType() {
          return BrokerService.class;
      }
  
      public boolean isSingleton() {
          return true;
      }
  
      public boolean isStart() {
          return start;
      }
  
      public void setConfig(Resource config) {
          this.config = config;
      }
  
      public void setStart(boolean start) {
          this.start = start;
      }
  
  }
  