ActiveMQ example source code file (VirtualDestinationInterceptor.java)

This example ActiveMQ source code file (VirtualDestinationInterceptor.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, destination, destination, destinationinterceptor, destinationmap, destinationmap, exception, exception, iterator, list, message, util, virtualdestination, virtualdestination, virtualdestinationinterceptor

The ActiveMQ VirtualDestinationInterceptor.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 java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Set;

import org.apache.activemq.broker.Broker;
import org.apache.activemq.broker.ConnectionContext;
import org.apache.activemq.broker.ProducerBrokerExchange;
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.Message;
import org.apache.activemq.filter.DestinationMap;

/**
 * Implements <a
 * href="http://activemq.apache.org/virtual-destinations.html">Virtual Topics</a>.
 * 
 * @org.apache.xbean.XBean
 * 
 */
public class VirtualDestinationInterceptor implements DestinationInterceptor {

    private DestinationMap destinationMap = new DestinationMap();
    private VirtualDestination[] virtualDestinations;

    public synchronized Destination intercept(Destination destination) {
        Set virtualDestinations = destinationMap.get(destination.getActiveMQDestination());
        List<Destination> destinations = new ArrayList();
        for (Iterator iter = virtualDestinations.iterator(); iter.hasNext();) {
            VirtualDestination virtualDestination = (VirtualDestination)iter.next();
            Destination newDestination = virtualDestination.intercept(destination);
            destinations.add(newDestination);
        }
        if (!destinations.isEmpty()) {
            if (destinations.size() == 1) {
                return destinations.get(0);
            } else {
                // should rarely be used but here just in case
                return createCompositeDestination(destination, destinations);
            }
        }
        return destination;
    }
    

    public synchronized void create(Broker broker, ConnectionContext context, ActiveMQDestination destination) throws Exception {
        for (VirtualDestination virt: virtualDestinations) {
            virt.create(broker, context, destination);
        }
    }

    public synchronized void remove(Destination destination) {     
    }

    public VirtualDestination[] getVirtualDestinations() {
        return virtualDestinations;
    }

    public void setVirtualDestinations(VirtualDestination[] virtualDestinations) {
        destinationMap = new DestinationMap();
        this.virtualDestinations = virtualDestinations;
        for (int i = 0; i < virtualDestinations.length; i++) {
            VirtualDestination virtualDestination = virtualDestinations[i];
            destinationMap.put(virtualDestination.getVirtualDestination(), virtualDestination);
        }
    }

    protected Destination createCompositeDestination(Destination destination, final List<Destination> destinations) {
        return new DestinationFilter(destination) {
            public void send(ProducerBrokerExchange context, Message messageSend) throws Exception {
                for (Iterator<Destination> iter = destinations.iterator(); iter.hasNext();) {
                    Destination destination = iter.next();
                    destination.send(context, messageSend);
                }
            }
        };
    }

}