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.loadbalancer;
018
019 import java.util.List;
020
021 import org.apache.camel.Exchange;
022 import org.apache.camel.Processor;
023
024 /**
025 * A {@link LoadBalancer} implementations which sends to all destinations
026 * (rather like JMS Topics).
027 *
028 * @version $Revision: 788621 $
029 */
030 public class TopicLoadBalancer extends LoadBalancerSupport {
031
032 public void process(Exchange exchange) throws Exception {
033 List<Processor> list = getProcessors();
034 for (Processor processor : list) {
035 Exchange copy = copyExchangeStrategy(processor, exchange);
036 processor.process(copy);
037 }
038 }
039
040 /**
041 * Strategy method to copy the exchange before sending to another endpoint.
042 * Derived classes such as the {@link org.apache.camel.processor.Pipeline Pipeline}
043 * will not clone the exchange
044 *
045 * @param processor the processor that will send the exchange
046 * @param exchange the exchange
047 * @return the current exchange if no copying is required such as for a
048 * pipeline otherwise a new copy of the exchange is returned.
049 */
050 protected Exchange copyExchangeStrategy(Processor processor, Exchange exchange) {
051 return exchange.copy();
052 }
053
054 public String toString() {
055 return "TopicLoadBalancer";
056 }
057
058 }