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.PollingConsumer;
024 import org.apache.camel.Processor;
025
026 /**
027 * A default implementation of an event driven {@link org.apache.camel.Consumer} which uses the
028 * {@link PollingConsumer}
029 *
030 * @version $Revision: 789087 $
031 */
032 public class DefaultScheduledPollConsumer extends ScheduledPollConsumer {
033 private PollingConsumer pollingConsumer;
034
035 public DefaultScheduledPollConsumer(DefaultEndpoint defaultEndpoint, Processor processor) {
036 super(defaultEndpoint, processor);
037 }
038
039 public DefaultScheduledPollConsumer(Endpoint endpoint, Processor processor, ScheduledExecutorService executor) {
040 super(endpoint, processor, executor);
041 }
042
043 protected void poll() throws Exception {
044 while (true) {
045 Exchange exchange = pollingConsumer.receiveNoWait();
046 if (exchange == null) {
047 break;
048 }
049
050 // if the result of the polled exchange has output we should create a new exchange and
051 // use the output as input to the next processor
052 if (exchange.hasOut()) {
053 // lets create a new exchange
054 Exchange newExchange = getEndpoint().createExchange();
055 newExchange.getIn().copyFrom(exchange.getOut());
056 exchange = newExchange;
057 }
058 getProcessor().process(exchange);
059 }
060 }
061
062 @Override
063 protected void doStart() throws Exception {
064 pollingConsumer = getEndpoint().createPollingConsumer();
065 super.doStart();
066 }
067
068 @Override
069 protected void doStop() throws Exception {
070 super.doStop();
071 if (pollingConsumer != null) {
072 pollingConsumer.stop();
073 }
074 }
075 }