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 */ 017package org.apache.camel.impl; 018 019import java.util.concurrent.RejectedExecutionException; 020 021import org.apache.camel.Endpoint; 022import org.apache.camel.Exchange; 023import org.apache.camel.IsSingleton; 024import org.apache.camel.Processor; 025import org.apache.camel.RuntimeExchangeException; 026import org.apache.camel.util.ServiceHelper; 027 028/** 029 * A simple implementation of {@link org.apache.camel.PollingConsumer} which just uses 030 * a {@link Processor}. This implementation does not support timeout based 031 * receive methods such as {@link #receive(long)} 032 * 033 * @version 034 */ 035public class ProcessorPollingConsumer extends PollingConsumerSupport implements IsSingleton { 036 private final Processor processor; 037 038 public ProcessorPollingConsumer(Endpoint endpoint, Processor processor) { 039 super(endpoint); 040 this.processor = processor; 041 } 042 043 protected void doStart() throws Exception { 044 ServiceHelper.startService(processor); 045 } 046 047 protected void doStop() throws Exception { 048 ServiceHelper.stopService(processor); 049 } 050 051 public Exchange receive() { 052 // must be started 053 if (!isRunAllowed() || !isStarted()) { 054 throw new RejectedExecutionException(this + " is not started, but in state: " + getStatus().name()); 055 } 056 057 Exchange exchange = getEndpoint().createExchange(); 058 try { 059 processor.process(exchange); 060 } catch (Exception e) { 061 throw new RuntimeExchangeException("Error while processing exchange", exchange, e); 062 } 063 return exchange; 064 } 065 066 public Exchange receiveNoWait() { 067 return receive(); 068 } 069 070 public Exchange receive(long timeout) { 071 return receive(); 072 } 073 074 @Override 075 public boolean isSingleton() { 076 return true; 077 } 078 079}