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ActiveMQ example source code file (MirroredQueue.java)

This example ActiveMQ source code file (MirroredQueue.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, brokerserviceaware, destination, destination, destinationinterceptor, exception, exception, failed, illegalargumentexception, no, reason, string, string

The ActiveMQ MirroredQueue.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.virtual;

import org.apache.activemq.broker.*;
import org.apache.activemq.broker.region.Destination;
import org.apache.activemq.broker.region.DestinationFilter;
import org.apache.activemq.broker.region.DestinationInterceptor;
import org.apache.activemq.command.ActiveMQDestination;
import org.apache.activemq.command.ActiveMQTopic;
import org.apache.activemq.command.Message;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Creates <a href="http://activemq.org/site/mirrored-queues.html">Mirrored
 * Queue</a> using a prefix and postfix to define the topic name on which to mirror the queue to.
 *
 * 
 * @org.apache.xbean.XBean
 */
public class MirroredQueue implements DestinationInterceptor, BrokerServiceAware {
    private static final transient Logger LOG = LoggerFactory.getLogger(MirroredQueue.class);
    private String prefix = "VirtualTopic.Mirror.";
    private String postfix = "";
    private boolean copyMessage = true;
    private BrokerService brokerService;

    public Destination intercept(final Destination destination) {
        if (destination.getActiveMQDestination().isQueue()) {
            if (!destination.getActiveMQDestination().isTemporary() || brokerService.isUseTempMirroredQueues()) {
                try {
                    final Destination mirrorDestination = getMirrorDestination(destination);
                    if (mirrorDestination != null) {
                        return new DestinationFilter(destination) {
                            public void send(ProducerBrokerExchange context, Message message) throws Exception {
                                message.setDestination(mirrorDestination.getActiveMQDestination());
                                mirrorDestination.send(context, message);
    
                                if (isCopyMessage()) {
                                    message = message.copy();
                                }
                                message.setDestination(destination.getActiveMQDestination());
                                super.send(context, message);
                            }
                        };
                    }
                }
                catch (Exception e) {
                    LOG.error("Failed to lookup the mirror destination for: " + destination + ". Reason: " + e, e);
                }
            }
        }
        return destination;
    }
    

    public void remove(Destination destination) {
        if (brokerService == null) {
            throw new IllegalArgumentException("No brokerService injected!");
        }
        ActiveMQDestination topic = getMirrorTopic(destination.getActiveMQDestination());
        if (topic != null) {
            try {
                brokerService.removeDestination(topic);
            } catch (Exception e) {
                LOG.error("Failed to remove mirror destination for " + destination + ". Reason: " + e,e);
            }
        }
        
    }

    public void create(Broker broker, ConnectionContext context, ActiveMQDestination destination) {}

    // Properties
    // -------------------------------------------------------------------------

    public String getPostfix() {
        return postfix;
    }

    /**
     * Sets any postix used to identify the queue consumers
     */
    public void setPostfix(String postfix) {
        this.postfix = postfix;
    }

    public String getPrefix() {
        return prefix;
    }

    /**
     * Sets the prefix wildcard used to identify the queue consumers for a given
     * topic
     */
    public void setPrefix(String prefix) {
        this.prefix = prefix;
    }

    public boolean isCopyMessage() {
        return copyMessage;
    }

    /**
     * Sets whether a copy of the message will be sent to each destination.
     * Defaults to true so that the forward destination is set as the
     * destination of the message
     */
    public void setCopyMessage(boolean copyMessage) {
        this.copyMessage = copyMessage;
    }

    public void setBrokerService(BrokerService brokerService) {
        this.brokerService = brokerService;
    }

    // Implementation methods
    //-------------------------------------------------------------------------
    protected Destination getMirrorDestination(Destination destination) throws Exception {
        if (brokerService == null) {
            throw new IllegalArgumentException("No brokerService injected!");
        }
        ActiveMQDestination topic = getMirrorTopic(destination.getActiveMQDestination());
        return brokerService.getDestination(topic);
    }

    protected ActiveMQDestination getMirrorTopic(ActiveMQDestination original) {
        return new ActiveMQTopic(prefix + original.getPhysicalName() + postfix);
    }

}

Other ActiveMQ examples (source code examples)

Here is a short list of links related to this ActiveMQ MirroredQueue.java source code file:

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