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ActiveMQ example source code file (TempQueueRegion.java)

This example ActiveMQ source code file (TempQueueRegion.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - ActiveMQ tags/keywords

activemqdestination, activemqdestination, brokerservice, brokerservice, destinationfactory, destinationstatistics, exception, exception, logger, systemusage, taskrunnerfactory, tempqueue, tempqueueregion, tempqueueregion

The ActiveMQ TempQueueRegion.java source code

/**
 * 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 javax.jms.JMSException;

import org.apache.activemq.broker.BrokerService;
import org.apache.activemq.broker.ConnectionContext;
import org.apache.activemq.broker.region.policy.PolicyEntry;
import org.apache.activemq.command.ActiveMQDestination;
import org.apache.activemq.command.ConsumerInfo;
import org.apache.activemq.command.MessageDispatchNotification;
import org.apache.activemq.thread.TaskRunnerFactory;
import org.apache.activemq.usage.SystemUsage;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * 
 */
public class TempQueueRegion extends AbstractTempRegion {
    private static final Logger LOG = LoggerFactory.getLogger(TempQueueRegion.class);
    private final BrokerService brokerService;
    
    public TempQueueRegion(RegionBroker broker, BrokerService brokerService, DestinationStatistics destinationStatistics, SystemUsage memoryManager, TaskRunnerFactory taskRunnerFactory,
                           DestinationFactory destinationFactory) {
        super(broker, destinationStatistics, memoryManager, taskRunnerFactory, destinationFactory);
        // We should allow the following to be configurable via a Destination
        // Policy
        // setAutoCreateDestinations(false);
        this.brokerService = brokerService;
    }

    protected Destination doCreateDestination(ConnectionContext context, ActiveMQDestination destination) throws Exception {  
        TempQueue result = new TempQueue(brokerService, destination, null, destinationStatistics, taskRunnerFactory);
        brokerService.getDestinationPolicy();
        configureQueue(result, destination);
        result.initialize();
        return result;
    }

    protected Subscription createSubscription(ConnectionContext context, ConsumerInfo info) throws JMSException {
        if (info.isBrowser()) {
            return new QueueBrowserSubscription(broker,usageManager,context, info);
        } else {
            return new QueueSubscription(broker,usageManager,context, info);
        }
    }

    public String toString() {
        return "TempQueueRegion: destinations=" + destinations.size() + ", subscriptions=" + subscriptions.size() + ", memory=" + usageManager.getMemoryUsage().getPercentUsage() + "%";
    }

    public void removeDestination(ConnectionContext context, ActiveMQDestination destination, long timeout) throws Exception {

        // Force a timeout value so that we don't get an error that
        // there is still an active sub. Temp destination may be removed
        // while a network sub is still active which is valid.
        if (timeout == 0) {
            timeout = 1;
        }

        super.removeDestination(context, destination, timeout);
    }
    
    /*
     * For a Queue, dispatch order is imperative to match acks, so the dispatch is deferred till 
     * the notification to ensure that the subscription chosen by the master is used.
     * 
     * (non-Javadoc)
     * @see org.apache.activemq.broker.region.AbstractRegion#processDispatchNotification(org.apache.activemq.command.MessageDispatchNotification)
     */
    public void processDispatchNotification(MessageDispatchNotification messageDispatchNotification) throws Exception {
        processDispatchNotificationViaDestination(messageDispatchNotification);
    }

    protected void configureQueue(Queue queue, ActiveMQDestination destination) {
        if (broker == null) {
            throw new IllegalStateException("broker property is not set");
        }
        if (broker.getDestinationPolicy() != null) {
            PolicyEntry entry = broker.getDestinationPolicy().getEntryFor(destination);
            if (entry != null) {
                entry.configure(broker,queue);
            }
        }
    }

}

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