/**
* 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.camel.processor;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import org.apache.camel.Endpoint;
import org.apache.camel.Exchange;
import org.apache.camel.Expression;
import org.apache.camel.Processor;
import org.apache.camel.Producer;
import org.apache.camel.impl.ProducerCache;
import org.apache.camel.impl.ServiceSupport;
import org.apache.camel.processor.aggregate.UseLatestAggregationStrategy;
import org.apache.camel.util.ExchangeHelper;
import org.apache.camel.util.ObjectHelper;
import static org.apache.camel.util.ObjectHelper.notNull;
/**
* Implements a dynamic <a
* href="http://activemq.apache.org/camel/recipient-list.html">Recipient List</a>
* pattern where the list of actual endpoints to send a message exchange to are
* dependent on some dynamic expression.
*
* @version $Revision: 701192 $
*/
public class RecipientList extends ServiceSupport implements Processor {
private final Expression<Exchange> expression;
private ProducerCache<Exchange> producerCache = new ProducerCache<Exchange>();
public RecipientList(Expression<Exchange> expression) {
notNull(expression, "expression");
this.expression = expression;
}
@Override
public String toString() {
return "RecipientList[" + expression + "]";
}
public void process(Exchange exchange) throws Exception {
Object receipientList = expression.evaluate(exchange);
sendToRecipientList(exchange, receipientList);
}
/**
* Sends the given exchange to the recipient list
*/
public void sendToRecipientList(Exchange exchange, Object receipientList) throws Exception {
Iterator iter = ObjectHelper.createIterator(receipientList);
List<Processor> processors = new ArrayList<Processor>();
while (iter.hasNext()) {
Object recipient = iter.next();
Endpoint<Exchange> endpoint = resolveEndpoint(exchange, recipient);
Producer<Exchange> producer = producerCache.getProducer(endpoint);
processors.add(producer);
}
MulticastProcessor mp = new MulticastProcessor(processors, new UseLatestAggregationStrategy());
mp.process(exchange);
}
protected Endpoint<Exchange> resolveEndpoint(Exchange exchange, Object recipient) {
return ExchangeHelper.resolveEndpoint(exchange, recipient);
}
protected void doStop() throws Exception {
producerCache.stop();
}
protected void doStart() throws Exception {
}
}