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.component.directvm;
018    
019    import org.apache.camel.Exchange;
020    import org.apache.camel.Processor;
021    import org.apache.camel.processor.DelegateProcessor;
022    import org.apache.camel.util.ExchangeHelper;
023    
024    /**
025    *
026    */
027    public final class DirectVmProcessor extends DelegateProcessor {
028    
029        private final DirectVmEndpoint endpoint;
030    
031        public DirectVmProcessor(Processor processor, DirectVmEndpoint endpoint) {
032            super(processor);
033            this.endpoint = endpoint;
034        }
035    
036        @Override
037        public void process(Exchange exchange) throws Exception {
038            // need to use a copy of the incoming exchange, so we route using this camel context
039            Exchange copy = prepareExchange(exchange);
040            try {
041                getProcessor().process(copy);
042            } finally {
043                // make sure to copy results back
044                ExchangeHelper.copyResults(exchange, copy);
045            }
046        }
047    
048        /**
049         * Strategy to prepare exchange for being processed by this consumer
050         *
051         * @param exchange the exchange
052         * @return the exchange to process by this consumer.
053         */
054        protected Exchange prepareExchange(Exchange exchange) {
055            // send a new copied exchange with new camel context (do not handover completions)
056            Exchange newExchange = ExchangeHelper.copyExchangeAndSetCamelContext(exchange, endpoint.getCamelContext(), false);
057            // set the from endpoint
058            newExchange.setFromEndpoint(endpoint);
059            return newExchange;
060        }
061    
062        @Override
063        public String toString() {
064            return "DirectVm[" + processor + "]";
065        }
066    }