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: 41832 $
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    }