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     *  It is deprecated in Camel 2.0, you need to move to use multicast, 
029     *  if you want to send the message to all destinations.
030     * 
031     * @version $Revision: 64146 $
032     * @deprecated
033     */
034    public class TopicLoadBalancer extends LoadBalancerSupport {
035    
036        public void process(Exchange exchange) throws Exception {
037            List<Processor> list = getProcessors();
038            for (Processor processor : list) {
039                Exchange copy = copyExchangeStrategy(processor, exchange);
040                processor.process(copy);
041            }
042        }
043    
044        /**
045         * Strategy method to copy the exchange before sending to another endpoint.
046         * Derived classes such as the {@link org.apache.camel.processor.Pipeline Pipeline}
047         * will not clone the exchange
048         * 
049         * @param processor the processor that will send the exchange
050         * @param exchange  the exchange
051         * @return the current exchange if no copying is required such as for a
052         *         pipeline otherwise a new copy of the exchange is returned.
053         */
054        protected Exchange copyExchangeStrategy(Processor processor, Exchange exchange) {
055            return exchange.copy();
056        }
057    
058        public boolean process(Exchange exchange, AsyncCallback callback) {
059            List<Processor> list = getProcessors();
060            for (Processor processor : list) {
061                Exchange copy = copyExchangeStrategy(processor, exchange);
062                try {
063                    processor.process(copy);
064                } catch (Exception ex) {
065                    // We don't handle the exception here
066                }
067            }
068            callback.done(false);
069            return false;
070        }
071    }