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 }