/**
* 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.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.Message;
import org.apache.activemq.filter.DestinationMap;
/**
* Implements <a
* href="http://activemq.apache.org/virtual-destinations.html">Virtual Topics</a>.
*
* @org.apache.xbean.XBean
* @version $Revision: 564679 $
*/
public class VirtualDestinationInterceptor implements DestinationInterceptor {
private DestinationMap destinationMap = new DestinationMap();
private VirtualDestination[] virtualDestinations;
public Destination intercept(Destination destination) {
Set virtualDestinations = destinationMap.get(destination.getActiveMQDestination());
List<Destination> destinations = new ArrayList<Destination>();
for (Iterator iter = virtualDestinations.iterator(); iter.hasNext();) {
VirtualDestination virtualDestination = (VirtualDestination)iter.next();
Destination newNestination = virtualDestination.intercept(destination);
destinations.add(newNestination);
}
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 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);
}
}
};
}
}