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.impl;
018    
019    import org.apache.camel.Endpoint;
020    import org.apache.camel.Exchange;
021    import org.apache.camel.Processor;
022    import org.apache.camel.RuntimeExchangeException;
023    import org.apache.camel.util.ServiceHelper;
024    
025    /**
026     * A simple implementation of {@link org.apache.camel.PollingConsumer} which just uses
027     * a {@link Processor}. This implementation does not support timeout based
028     * receive methods such as {@link #receive(long)}
029     *
030     * @version $Revision: 751655 $
031     */
032    public class ProcessorPollingConsumer extends PollingConsumerSupport {
033        private Processor processor;
034    
035        public ProcessorPollingConsumer(Endpoint endpoint, Processor processor) {
036            super(endpoint);
037            this.processor = processor;
038        }
039    
040        protected void doStart() throws Exception {
041            ServiceHelper.startService(processor);
042        }
043    
044        protected void doStop() throws Exception {
045            ServiceHelper.stopService(processor);
046        }
047    
048        public Exchange receive() {
049            Exchange exchange = getEndpoint().createExchange();
050            try {
051                processor.process(exchange);
052            } catch (Exception e) {
053                throw new RuntimeExchangeException(e, exchange);
054            }
055            return exchange;
056        }
057    
058        public Exchange receiveNoWait() {
059            return receive();
060        }
061    
062        public Exchange receive(long timeout) {
063            return receive();
064        }
065    }