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.PollingConsumer;
022    import org.apache.camel.Processor;
023    import org.apache.camel.RuntimeExchangeException;
024    import org.apache.camel.util.ServiceHelper;
025    
026    /**
027     * A simple implementation of {@link PollingConsumer} which just uses
028     * a {@link Processor}. This implementation does not support timeout based
029     * receive methods such as {@link #receive(long)}
030     *
031     * @version $Revision: 36321 $
032     */
033    public class ProcessorPollingConsumer extends PollingConsumerSupport {
034        private Processor processor;
035    
036        public ProcessorPollingConsumer(Endpoint endpoint, Processor processor) {
037            super(endpoint);
038            this.processor = processor;
039        }
040    
041        protected void doStart() throws Exception {
042            ServiceHelper.startService(processor);
043        }
044    
045        protected void doStop() throws Exception {
046            ServiceHelper.stopService(processor);
047        }
048    
049        public Exchange receive() {
050            Exchange exchange = getEndpoint().createExchange();
051            try {
052                processor.process(exchange);
053            } catch (Exception e) {
054                throw new RuntimeExchangeException(e, exchange);
055            }
056            return exchange;
057        }
058    
059        public Exchange receiveNoWait() {
060            return receive();
061        }
062    
063        public Exchange receive(long timeout) {
064            return receive();
065        }
066    }