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;
018    
019    import org.apache.camel.AsyncCallback;
020    import org.apache.camel.AsyncProcessor;
021    import org.apache.camel.Endpoint;
022    import org.apache.camel.Exchange;
023    import org.apache.camel.ExchangePattern;
024    import org.apache.camel.Producer;
025    import org.apache.camel.Service;
026    import org.apache.camel.impl.ServiceSupport;
027    import org.apache.camel.impl.converter.AsyncProcessorTypeConverter;
028    import org.apache.commons.logging.Log;
029    import org.apache.commons.logging.LogFactory;
030    
031    /**
032     * Processor for forwarding exchanges to an endpoint destination.
033     *
034     * @version $Revision: 64395 $
035     */
036    public class SendProcessor extends ServiceSupport implements AsyncProcessor, Service {
037        private static final transient Log LOG = LogFactory.getLog(SendProcessor.class);
038        private Endpoint destination;
039        private Producer producer;
040        private AsyncProcessor processor;
041        private ExchangePattern pattern;
042    
043        public SendProcessor(Endpoint destination) {
044            if (destination == null) {
045                throw new IllegalArgumentException("Endpoint cannot be null!");
046            }
047            this.destination = destination;
048        }
049    
050        public SendProcessor(Endpoint destination, ExchangePattern pattern) {
051            this(destination);
052            this.pattern = pattern;
053        }
054    
055        @Override
056        public String toString() {
057            return "sendTo(" + destination + (pattern != null ? " " + pattern : "") + ")";
058        }
059    
060        public void process(Exchange exchange) throws Exception {
061            if (producer == null) {
062                if (isStopped()) {
063                    LOG.warn("Ignoring exchange sent after processor is stopped: " + exchange);
064                } else {
065                    throw new IllegalStateException("No producer, this processor has not been started!");
066                }
067            } else {
068                configureExchange(exchange);
069                producer.process(exchange);
070            }
071        }
072    
073        public boolean process(Exchange exchange, AsyncCallback callback) {
074            if (producer == null) {
075                if (isStopped()) {
076                    LOG.warn("Ignoring exchange sent after processor is stopped: " + exchange);
077                } else {
078                    exchange.setException(new IllegalStateException("No producer, this processor has not been started!"));
079                }
080                callback.done(true);
081                return true;
082            } else {
083                configureExchange(exchange);
084                return processor.process(exchange, callback);
085            }
086        }
087    
088        public Endpoint getDestination() {
089            return destination;
090        }
091    
092        protected void doStart() throws Exception {
093            this.producer = destination.createProducer();
094            this.producer.start();
095            this.processor = AsyncProcessorTypeConverter.convert(producer);
096        }
097    
098        protected void doStop() throws Exception {
099            if (producer != null) {
100                try {
101                    producer.stop();
102                } finally {
103                    producer = null;
104                    processor = null;
105                }
106            }
107        }
108    
109        protected void configureExchange(Exchange exchange) {
110            if (pattern != null) {
111                exchange.setPattern(pattern);
112            }
113        }
114    }