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.BlockingQueue;
020 import java.util.concurrent.TimeUnit;
021
022 import org.apache.camel.AsyncCallback;
023 import org.apache.camel.AsyncProcessor;
024 import org.apache.camel.Consumer;
025 import org.apache.camel.Exchange;
026 import org.apache.camel.Processor;
027 import org.apache.camel.impl.ServiceSupport;
028 import org.apache.camel.impl.converter.AsyncProcessorTypeConverter;
029 import org.apache.commons.logging.Log;
030 import org.apache.commons.logging.LogFactory;
031
032 /**
033 * A Consumer for the SEDA component.
034 *
035 * @version $Revision: 707305 $
036 */
037 public class SedaConsumer extends ServiceSupport implements Consumer, Runnable {
038 private static final transient Log LOG = LogFactory.getLog(SedaConsumer.class);
039
040 private SedaEndpoint endpoint;
041 private AsyncProcessor processor;
042 private Thread thread;
043
044 public SedaConsumer(SedaEndpoint endpoint, Processor processor) {
045 this.endpoint = endpoint;
046 this.processor = AsyncProcessorTypeConverter.convert(processor);
047 }
048
049 @Override
050 public String toString() {
051 return "SedaConsumer: " + endpoint.getEndpointUri();
052 }
053
054 public void run() {
055 BlockingQueue<Exchange> queue = endpoint.getQueue();
056 while (queue != null && isRunAllowed()) {
057 final Exchange exchange;
058 try {
059 exchange = queue.poll(1000, TimeUnit.MILLISECONDS);
060 } catch (InterruptedException e) {
061 if (LOG.isDebugEnabled()) {
062 LOG.debug("Interupted: " + e, e);
063 }
064 continue;
065 }
066 if (exchange != null) {
067 if (isRunAllowed()) {
068 try {
069 processor.process(exchange, new AsyncCallback() {
070 public void done(boolean sync) {
071 }
072 });
073 } catch (Exception e) {
074 LOG.error("Seda queue caught: " + e, e);
075 }
076 } else {
077 LOG.warn("This consumer is stopped during polling an exchange, so putting it back on the seda queue: " + exchange);
078 try {
079 queue.put(exchange);
080 } catch (InterruptedException e) {
081 if (LOG.isDebugEnabled()) {
082 LOG.debug("Interupted: " + e, e);
083 }
084 }
085 }
086 }
087 }
088 }
089
090 protected void doStart() throws Exception {
091 thread = new Thread(this, getThreadName(endpoint.getEndpointUri()));
092 thread.setDaemon(true);
093 thread.start();
094 }
095
096 protected void doStop() throws Exception {
097 thread.join();
098 thread = null;
099 }
100
101 }