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.AsyncCallback; 022 import org.apache.camel.Exchange; 023 import org.apache.camel.Processor; 024 025 /** 026 * A {@link LoadBalancer} implementations which sends to all destinations 027 * (rather like JMS Topics). 028 * 029 * @version $Revision: 2375 $ 030 * 031 */ 032 public class TopicLoadBalancer extends LoadBalancerSupport { 033 034 public void process(Exchange exchange) throws Exception { 035 List<Processor> list = getProcessors(); 036 for (Processor processor : list) { 037 Exchange copy = copyExchangeStrategy(processor, exchange); 038 processor.process(copy); 039 } 040 } 041 042 /** 043 * Strategy method to copy the exchange before sending to another endpoint. 044 * Derived classes such as the {@link org.apache.camel.processor.Pipeline Pipeline} 045 * will not clone the exchange 046 * 047 * @param processor the processor that will send the exchange 048 * @param exchange the exchange 049 * @return the current exchange if no copying is required such as for a 050 * pipeline otherwise a new copy of the exchange is returned. 051 */ 052 protected Exchange copyExchangeStrategy(Processor processor, Exchange exchange) { 053 return exchange.copy(); 054 } 055 056 public boolean process(Exchange exchange, AsyncCallback callback) { 057 List<Processor> list = getProcessors(); 058 for (Processor processor : list) { 059 Exchange copy = copyExchangeStrategy(processor, exchange); 060 try { 061 processor.process(copy); 062 } catch (Exception ex) { 063 // We don't handle the exception here 064 } 065 } 066 callback.done(false); 067 return false; 068 } 069 }