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 java.util.concurrent.ScheduledExecutorService;
020
021 import org.apache.camel.Endpoint;
022 import org.apache.camel.Exchange;
023 import org.apache.camel.Message;
024 import org.apache.camel.PollingConsumer;
025 import org.apache.camel.Processor;
026
027 /**
028 * A default implementation of an event driven {@link org.apache.camel.Consumer} which uses the
029 * {@link PollingConsumer}
030 *
031 * @version $Revision: 751221 $
032 */
033 public class DefaultScheduledPollConsumer extends ScheduledPollConsumer {
034 private PollingConsumer pollingConsumer;
035
036 public DefaultScheduledPollConsumer(DefaultEndpoint defaultEndpoint, Processor processor) {
037 super(defaultEndpoint, processor);
038 }
039
040 public DefaultScheduledPollConsumer(Endpoint endpoint, Processor processor, ScheduledExecutorService executor) {
041 super(endpoint, processor, executor);
042 }
043
044 protected void poll() throws Exception {
045 while (true) {
046 Exchange exchange = pollingConsumer.receiveNoWait();
047 if (exchange == null) {
048 break;
049 }
050
051 // if the result of the polled exchange has output we should create a new exchange and
052 // use the output as input to the next processor
053 Message out = exchange.getOut(false);
054 if (out != null) {
055 // lets create a new exchange
056 Exchange newExchange = getEndpoint().createExchange();
057 newExchange.getIn().copyFrom(out);
058 exchange = newExchange;
059 }
060 getProcessor().process(exchange);
061 }
062 }
063
064 @Override
065 protected void doStart() throws Exception {
066 pollingConsumer = getEndpoint().createPollingConsumer();
067 super.doStart();
068 }
069
070 @Override
071 protected void doStop() throws Exception {
072 super.doStop();
073 if (pollingConsumer != null) {
074 pollingConsumer.stop();
075 }
076 }
077 }