| /** |
| * 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.loadbalancer; |
| |
| import java.util.List; |
| |
| import org.apache.camel.AsyncCallback; |
| import org.apache.camel.Exchange; |
| import org.apache.camel.Processor; |
| |
| /** |
| * A {@link LoadBalancer} implementations which sends to all destinations |
| * (rather like JMS Topics). |
| * <p/> |
| * The {@link org.apache.camel.processor.MulticastProcessor} is more powerful as it offers |
| * option to run in parallel and decide whether or not to stop on failure etc. |
| * |
| * @version |
| */ |
| public class TopicLoadBalancer extends LoadBalancerSupport { |
| |
| public boolean process(final Exchange exchange, final AsyncCallback callback) { |
| List<Processor> list = getProcessors(); |
| // too hard to do multiple async, so we do it sync |
| for (Processor processor : list) { |
| try { |
| Exchange copy = copyExchangeStrategy(processor, exchange); |
| processor.process(copy); |
| } catch (Throwable e) { |
| exchange.setException(e); |
| // stop on failure |
| break; |
| } |
| } |
| callback.done(true); |
| return true; |
| } |
| |
| /** |
| * Strategy method to copy the exchange before sending to another endpoint. |
| * Derived classes such as the {@link org.apache.camel.processor.Pipeline Pipeline} |
| * will not clone the exchange |
| * |
| * @param processor the processor that will send the exchange |
| * @param exchange the exchange |
| * @return the current exchange if no copying is required such as for a |
| * pipeline otherwise a new copy of the exchange is returned. |
| */ |
| protected Exchange copyExchangeStrategy(Processor processor, Exchange exchange) { |
| return exchange.copy(); |
| } |
| |
| public String toString() { |
| return "TopicLoadBalancer"; |
| } |
| } |