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