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.camel.util.ObjectHelper;
029    import org.apache.commons.logging.Log;
030    import org.apache.commons.logging.LogFactory;
031    
032    /**
033     * Processor for forwarding exchanges to an endpoint destination.
034     *
035     * @version $Revision: 751648 $
036     */
037    public class SendProcessor extends ServiceSupport implements AsyncProcessor, Service {
038        protected static final transient Log LOG = LogFactory.getLog(SendProcessor.class);
039        protected Endpoint destination;
040        protected Producer producer;
041        protected AsyncProcessor processor;
042        protected ExchangePattern pattern;
043    
044        public SendProcessor(Endpoint destination) {
045            ObjectHelper.notNull(destination, "destination");
046            this.destination = destination;
047        }
048    
049        public SendProcessor(Endpoint destination, ExchangePattern pattern) {
050            this(destination);
051            this.pattern = pattern;
052        }
053    
054        @Override
055        public String toString() {
056            return "sendTo(" + destination + (pattern != null ? " " + pattern : "") + ")";
057        }
058    
059        public void process(Exchange exchange) throws Exception {
060            if (producer == null) {
061                if (isStopped()) {
062                    LOG.warn("Ignoring exchange sent after processor is stopped: " + exchange);
063                } else {
064                    throw new IllegalStateException("No producer, this processor has not been started!");
065                }
066            } else {
067                exchange = configureExchange(exchange);
068                producer.process(exchange);
069            }
070        }
071    
072        public boolean process(Exchange exchange, AsyncCallback callback) {
073            if (producer == null) {
074                if (isStopped()) {
075                    LOG.warn("Ignoring exchange sent after processor is stopped: " + exchange);
076                } else {
077                    exchange.setException(new IllegalStateException("No producer, this processor has not been started!"));
078                }
079                callback.done(true);
080                return true;
081            } else {
082                exchange = configureExchange(exchange);
083                return processor.process(exchange, callback);
084            }
085        }
086    
087        public Endpoint getDestination() {
088            return destination;
089        }
090    
091        protected void doStart() throws Exception {
092            this.producer = destination.createProducer();
093            this.producer.start();
094            this.processor = AsyncProcessorTypeConverter.convert(producer);
095        }
096    
097        protected void doStop() throws Exception {
098            if (producer != null) {
099                try {
100                    producer.stop();
101                } finally {
102                    producer = null;
103                    processor = null;
104                }
105            }
106        }
107    
108        protected Exchange configureExchange(Exchange exchange) {
109            if (pattern != null) {
110                exchange.setPattern(pattern);
111            }
112            return exchange;
113        }
114    
115    }