001 /**
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements. See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License. You may obtain a copy of the License at
008 *
009 * http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017 package org.apache.camel.processor;
018
019 import java.util.Iterator;
020
021 import org.apache.camel.Endpoint;
022 import org.apache.camel.Exchange;
023 import org.apache.camel.Expression;
024 import org.apache.camel.Processor;
025 import org.apache.camel.converter.ObjectConverter;
026 import org.apache.camel.impl.ServiceSupport;
027 import org.apache.camel.util.ExchangeHelper;
028 import org.apache.camel.util.ProducerCache;
029
030 import static org.apache.camel.util.ObjectHelper.notNull;
031
032 /**
033 * Implements a dynamic <a
034 * href="http://activemq.apache.org/camel/recipient-list.html">Recipient List</a>
035 * pattern where the list of actual endpoints to send a message exchange to are
036 * dependent on some dynamic expression.
037 *
038 * @version $Revision: 563607 $
039 */
040 public class RecipientList extends ServiceSupport implements Processor {
041 private final Expression<Exchange> expression;
042 private ProducerCache<Exchange> producerCache = new ProducerCache<Exchange>();
043
044 public RecipientList(Expression<Exchange> expression) {
045 notNull(expression, "expression");
046 this.expression = expression;
047 }
048
049 @Override
050 public String toString() {
051 return "RecipientList[" + expression + "]";
052 }
053
054 public void process(Exchange exchange) throws Exception {
055 Object receipientList = expression.evaluate(exchange);
056 Iterator iter = ObjectConverter.iterator(receipientList);
057 while (iter.hasNext()) {
058 Object recipient = iter.next();
059 Endpoint<Exchange> endpoint = resolveEndpoint(exchange, recipient);
060 producerCache.getProducer(endpoint).process(exchange);
061 }
062 }
063
064 protected Endpoint<Exchange> resolveEndpoint(Exchange exchange, Object recipient) {
065 return ExchangeHelper.resolveEndpoint(exchange, recipient);
066 }
067
068 protected void doStop() throws Exception {
069 producerCache.stop();
070 }
071
072 protected void doStart() throws Exception {
073 }
074 }