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.AlreadyStoppedException;
021 import org.apache.camel.Consumer;
022 import org.apache.camel.Exchange;
023 import org.apache.camel.Processor;
024 import org.apache.camel.impl.ServiceSupport;
025 import org.apache.commons.logging.Log;
026 import org.apache.commons.logging.LogFactory;
027
028 import java.util.concurrent.TimeUnit;
029
030 /**
031 * @version $Revision: 553312 $
032 */
033 public class QueueEndpointConsumer<E extends Exchange> extends ServiceSupport implements Consumer<E>, Runnable {
034 private static final Log log = LogFactory.getLog(QueueEndpointConsumer.class);
035 private static int counter;
036
037 private QueueEndpoint<E> endpoint;
038 private Processor processor;
039 private Thread thread;
040
041 public QueueEndpointConsumer(QueueEndpoint<E> endpoint, Processor processor) {
042 this.endpoint = endpoint;
043 this.processor = processor;
044 }
045
046 @Override
047 public String toString() {
048 return "QueueEndpointConsumer: " + endpoint.getEndpointUri();
049 }
050
051 public void run() {
052 while (!isStopping()) {
053 E exchange;
054 try {
055 exchange = endpoint.getQueue().poll(1000, TimeUnit.MILLISECONDS);
056 }
057 catch (InterruptedException e) {
058 break;
059 }
060 if (exchange != null && !isStopping()) {
061 try {
062 processor.process(exchange);
063 }
064 catch (AlreadyStoppedException e) {
065 log.debug("Ignoring failed message due to shutdown: " + e, e);
066 break;
067 }
068 catch (Throwable e) {
069 log.error(e);
070 }
071 }
072 }
073 }
074
075 protected void doStart() throws Exception {
076 thread = new Thread(this, endpoint.getEndpointUri() + " thread:" + nextCounter());
077 thread.setDaemon(true);
078 thread.start();
079 }
080
081 protected void doStop() throws Exception {
082 thread.join();
083 }
084
085 protected static synchronized int nextCounter() {
086 return ++counter;
087 }
088 }