001    /**
002     *
003     * Licensed to the Apache Software Foundation (ASF) under one or more
004     * contributor license agreements.  See the NOTICE file distributed with
005     * this work for additional information regarding copyright ownership.
006     * The ASF licenses this file to You under the Apache License, Version 2.0
007     * (the "License"); you may not use this file except in compliance with
008     * the License.  You may obtain a copy of the License at
009     *
010     * http://www.apache.org/licenses/LICENSE-2.0
011     *
012     * Unless required by applicable law or agreed to in writing, software
013     * distributed under the License is distributed on an "AS IS" BASIS,
014     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015     * See the License for the specific language governing permissions and
016     * limitations under the License.
017     */
018    package org.apache.camel.processor.loadbalancer;
019    
020    import org.apache.camel.Exchange;
021    import org.apache.camel.Processor;
022    import org.apache.camel.processor.Pipeline;
023    
024    import java.util.List;
025    
026    /**
027     * A {@link LoadBalancer} implementations which sends to all destinations (rather like JMS Topics)
028     *
029     * @version $Revision: 1.1 $
030     */
031    public class TopicLoadBalancer extends LoadBalancerSupport {
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. Derived classes such as the
042         * {@link Pipeline} will not clone the exchange
043         *
044         * @param processor the processor that will send the exchange
045         * @param exchange @return the current exchange if no copying is required such as for a pipeline otherwise a new copy of the exchange is returned.
046         */
047        protected Exchange copyExchangeStrategy(Processor processor, Exchange exchange) {
048            return exchange.copy();
049        }
050    }