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.seda;
018    
019    import java.util.concurrent.TimeUnit;
020    
021    import org.apache.camel.AlreadyStoppedException;
022    import org.apache.camel.Consumer;
023    import org.apache.camel.Exchange;
024    import org.apache.camel.Processor;
025    import org.apache.camel.impl.ServiceSupport;
026    import org.apache.commons.logging.Log;
027    import org.apache.commons.logging.LogFactory;
028    
029    /**
030     * @version $Revision: 563607 $
031     */
032    public class SedaConsumer<E extends Exchange> extends ServiceSupport implements Consumer<E>, Runnable {
033        private static final Log LOG = LogFactory.getLog(SedaConsumer.class);
034    
035        private SedaEndpoint<E> endpoint;
036        private Processor processor;
037        private Thread thread;
038    
039        public SedaConsumer(SedaEndpoint<E> endpoint, Processor processor) {
040            this.endpoint = endpoint;
041            this.processor = processor;
042        }
043    
044        @Override
045        public String toString() {
046            return "QueueConsumer: " + endpoint.getEndpointUri();
047        }
048    
049        public void run() {
050            while (!isStopping()) {
051                E exchange;
052                try {
053                    exchange = endpoint.getQueue().poll(1000, TimeUnit.MILLISECONDS);
054                } catch (InterruptedException e) {
055                    break;
056                }
057                if (exchange != null && !isStopping()) {
058                    try {
059                        processor.process(exchange);
060                    } catch (AlreadyStoppedException e) {
061                        LOG.debug("Ignoring failed message due to shutdown: " + e, e);
062                        break;
063                    } catch (Throwable e) {
064                        LOG.error(e);
065                    }
066                }
067            }
068        }
069    
070        protected void doStart() throws Exception {
071            thread = new Thread(this, getThreadName(endpoint.getEndpointUri()));
072            thread.setDaemon(true);
073            thread.start();
074        }
075    
076        protected void doStop() throws Exception {
077            thread.join();
078        }
079    
080    }