001    /**
002     *
003     * Licensed to the Apache Software Foundation (ASF) under one or more
004     * contributor license agreements.  See the NOTICE file distributed with
005     * this work for additional information regarding copyright ownership.
006     * The ASF licenses this file to You under the Apache License, Version 2.0
007     * (the "License"); you may not use this file except in compliance with
008     * the License.  You may obtain a copy of the License at
009     *
010     * http://www.apache.org/licenses/LICENSE-2.0
011     *
012     * Unless required by applicable law or agreed to in writing, software
013     * distributed under the License is distributed on an "AS IS" BASIS,
014     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015     * See the License for the specific language governing permissions and
016     * limitations under the License.
017     */
018    package org.apache.camel.component.queue;
019    
020    import org.apache.camel.Consumer;
021    import org.apache.camel.Exchange;
022    import org.apache.camel.Processor;
023    import org.apache.camel.impl.ServiceSupport;
024    
025    import java.util.concurrent.TimeUnit;
026    
027    /**
028     * @version $Revision: 534145 $
029     */
030    public class QueueEndpointConsumer<E extends Exchange> extends ServiceSupport implements Consumer<E>, Runnable {
031        private QueueEndpoint<E> endpoint;
032        private Processor processor;
033        private Thread thread;
034    
035        public QueueEndpointConsumer(QueueEndpoint<E> endpoint, Processor processor) {
036            this.endpoint = endpoint;
037            this.processor = processor;
038        }
039    
040        @Override
041        public String toString() {
042            return "QueueEndpointConsumer: " + endpoint.getEndpointUri();
043        }
044    
045        public void run() {
046            while (!isStopping()) {
047                E exchange;
048                try {
049                    exchange = endpoint.getQueue().poll(1000, TimeUnit.MILLISECONDS);
050                }
051                catch (InterruptedException e) {
052                    break;
053                }
054                if (exchange != null && !isStopping()) {
055                    try {
056                        processor.process(exchange);
057                    }
058                    catch (Throwable e) {
059                        e.printStackTrace();
060                    }
061                }
062            }
063        }
064    
065        protected void doStart() throws Exception {
066            thread = new Thread(this, endpoint.getEndpointUri());
067            thread.setDaemon(true);
068            thread.start();
069        }
070    
071        protected void doStop() throws Exception {
072            thread.join();
073        }
074    }