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; 018 019import java.io.IOException; 020import org.apache.activemq.broker.BrokerService; 021import org.apache.activemq.broker.ConnectionContext; 022import org.apache.activemq.broker.region.cursors.VMPendingMessageCursor; 023import org.apache.activemq.command.ActiveMQDestination; 024import org.apache.activemq.command.ActiveMQTempDestination; 025import org.apache.activemq.store.MessageStore; 026import org.apache.activemq.thread.TaskRunnerFactory; 027import org.slf4j.Logger; 028import org.slf4j.LoggerFactory; 029 030/** 031 * The Queue is a List of MessageEntry objects that are dispatched to matching 032 * subscriptions. 033 * 034 * 035 */ 036public 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 LOG.debug(" changed ownership of " + this + " to "+ tempDest.getConnectionId()); 080 } 081 super.addSubscription(context, sub); 082 } 083 084 @Override 085 public void dispose(ConnectionContext context) throws IOException { 086 try { 087 purge(); 088 } catch (Exception e) { 089 LOG.warn("Caught an exception purging Queue: " + destination); 090 } 091 super.dispose(context); 092 } 093}