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.broker.region;
  
  import java.io.IOException;
  import org.apache.activemq.broker.BrokerService;
  import org.apache.activemq.broker.ConnectionContext;
  import org.apache.activemq.broker.region.cursors.VMPendingMessageCursor;
  import org.apache.activemq.command.ActiveMQDestination;
  import org.apache.activemq.command.ActiveMQTempDestination;
  import org.apache.activemq.store.MessageStore;
  import org.apache.activemq.thread.TaskRunnerFactory;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * The Queue is a List of MessageEntry objects that are dispatched to matching
   * subscriptions.
   * 
   * 
   */
  public class TempQueue extends Queue{
      private static final Logger LOG = LoggerFactory.getLogger(TempQueue.class);
      private final ActiveMQTempDestination tempDest;
     
      
      /**
       * @param brokerService
       * @param destination
       * @param store
       * @param parentStats
       * @param taskFactory
       * @throws Exception
       */
      public TempQueue(BrokerService brokerService,
              ActiveMQDestination destination, MessageStore store,
              DestinationStatistics parentStats, TaskRunnerFactory taskFactory)
              throws Exception {
          super(brokerService, destination, store, parentStats, taskFactory);
          this.tempDest = (ActiveMQTempDestination) destination;
      }
      
      @Override
      public void initialize() throws Exception {
          this.messages=new VMPendingMessageCursor(false);
          this.messages.setMemoryUsageHighWaterMark(getCursorMemoryHighWaterMark());
          this.systemUsage = brokerService.getSystemUsage();
          memoryUsage.setParent(systemUsage.getMemoryUsage());           
          this.taskRunner = taskFactory.createTaskRunner(this, "TempQueue:  " + destination.getPhysicalName());
      }
      
      @Override
      public void addSubscription(ConnectionContext context, Subscription sub) throws Exception {
          // Only consumers on the same connection can consume from
          // the temporary destination
          // However, we could have failed over - and we do this
          // check client side anyways ....
          if (!context.isFaultTolerant()
                  && (!context.isNetworkConnection() && !tempDest
                          .getConnectionId().equals(
                                  sub.getConsumerInfo().getConsumerId()
                                          .getConnectionId()))) {
  
              tempDest.setConnectionId(sub.getConsumerInfo().getConsumerId().getConnectionId());
              LOG.debug("changed ownership of {} to {}", this, tempDest.getConnectionId());
          }
          super.addSubscription(context, sub);
      }
      
      @Override
      public void dispose(ConnectionContext context) throws IOException {
          if (this.destinationStatistics.getMessages().getCount() > 0) {
              LOG.info("{} on dispose, purge of {} pending messages: {}",
                      getActiveMQDestination().getQualifiedName(),
                      this.destinationStatistics.getMessages().getCount(),
                      messages);
              // we may want to capture these message ids in an advisory
          }
          try {
              purge();
          } catch (Exception e) {
              LOG.warn("Caught an exception purging Queue: {}", destination, e);
          }
          super.dispose(context);
      }
  }
  