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 */
017 package org.apache.activemq.broker.region;
018
019 import java.io.IOException;
020 import org.apache.activemq.broker.BrokerService;
021 import org.apache.activemq.broker.ConnectionContext;
022 import org.apache.activemq.broker.region.cursors.VMPendingMessageCursor;
023 import org.apache.activemq.command.ActiveMQDestination;
024 import org.apache.activemq.command.ActiveMQTempDestination;
025 import org.apache.activemq.store.MessageStore;
026 import org.apache.activemq.thread.TaskRunnerFactory;
027 import org.slf4j.Logger;
028 import org.slf4j.LoggerFactory;
029
030 /**
031 * The Queue is a List of MessageEntry objects that are dispatched to matching
032 * subscriptions.
033 *
034 *
035 */
036 public class TempQueue extends Queue{
037 private static final Logger LOG = LoggerFactory.getLogger(TempQueue.class);
038 private final ActiveMQTempDestination tempDest;
039
040
041 /**
042 * @param brokerService
043 * @param destination
044 * @param store
045 * @param parentStats
046 * @param taskFactory
047 * @throws Exception
048 */
049 public TempQueue(BrokerService brokerService,
050 ActiveMQDestination destination, MessageStore store,
051 DestinationStatistics parentStats, TaskRunnerFactory taskFactory)
052 throws Exception {
053 super(brokerService, destination, store, parentStats, taskFactory);
054 this.tempDest = (ActiveMQTempDestination) destination;
055 }
056
057 @Override
058 public void initialize() throws Exception {
059 this.messages=new VMPendingMessageCursor(false);
060 this.messages.setMemoryUsageHighWaterMark(getCursorMemoryHighWaterMark());
061 this.systemUsage = brokerService.getSystemUsage();
062 memoryUsage.setParent(systemUsage.getMemoryUsage());
063 this.taskRunner = taskFactory.createTaskRunner(this, "TempQueue: " + destination.getPhysicalName());
064 }
065
066 @Override
067 public void addSubscription(ConnectionContext context, Subscription sub) throws Exception {
068 // Only consumers on the same connection can consume from
069 // the temporary destination
070 // However, we could have failed over - and we do this
071 // check client side anyways ....
072 if (!context.isFaultTolerant()
073 && (!context.isNetworkConnection() && !tempDest
074 .getConnectionId().equals(
075 sub.getConsumerInfo().getConsumerId()
076 .getConnectionId()))) {
077
078 tempDest.setConnectionId(sub.getConsumerInfo().getConsumerId().getConnectionId());
079 if (LOG.isDebugEnabled()) {
080 LOG.debug(" changed ownership of " + this + " to "+ tempDest.getConnectionId());
081 }
082 }
083 super.addSubscription(context, sub);
084 }
085
086 @Override
087 public void dispose(ConnectionContext context) throws IOException {
088 try {
089 purge();
090 } catch (Exception e) {
091 LOG.warn("Caught an exception purging Queue: " + destination);
092 }
093 super.dispose(context);
094 }
095 }