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.component.seda; 018 019 import java.util.concurrent.BlockingQueue; 020 import java.util.concurrent.ExecutorService; 021 import java.util.concurrent.TimeUnit; 022 023 import org.apache.camel.Consumer; 024 import org.apache.camel.Exchange; 025 import org.apache.camel.Processor; 026 import org.apache.camel.impl.ServiceSupport; 027 import org.apache.camel.util.concurrent.ExecutorServiceHelper; 028 import org.apache.commons.logging.Log; 029 import org.apache.commons.logging.LogFactory; 030 031 /** 032 * A Consumer for the SEDA component. 033 * 034 * @version $Revision: 772598 $ 035 */ 036 public class SedaConsumer extends ServiceSupport implements Consumer, Runnable { 037 private static final transient Log LOG = LogFactory.getLog(SedaConsumer.class); 038 039 private SedaEndpoint endpoint; 040 private Processor processor; 041 private ExecutorService executor; 042 043 public SedaConsumer(SedaEndpoint endpoint, Processor processor) { 044 this.endpoint = endpoint; 045 this.processor = processor; 046 } 047 048 @Override 049 public String toString() { 050 return "SedaConsumer[" + endpoint.getEndpointUri() + "]"; 051 } 052 053 public void run() { 054 BlockingQueue<Exchange> queue = endpoint.getQueue(); 055 while (queue != null && isRunAllowed()) { 056 final Exchange exchange; 057 try { 058 exchange = queue.poll(1000, TimeUnit.MILLISECONDS); 059 } catch (InterruptedException e) { 060 LOG.debug("Sleep interrupted, are we stopping? " + (isStopping() || isStopped())); 061 continue; 062 } 063 if (exchange != null) { 064 if (isRunAllowed()) { 065 try { 066 processor.process(exchange); 067 } catch (Exception e) { 068 LOG.error("Seda queue caught: " + e, e); 069 } 070 } else { 071 LOG.warn("This consumer is stopped during polling an exchange, so putting it back on the seda queue: " + exchange); 072 try { 073 queue.put(exchange); 074 } catch (InterruptedException e) { 075 LOG.debug("Sleep interrupted, are we stopping? " + (isStopping() || isStopped())); 076 } 077 } 078 } 079 } 080 } 081 082 protected void doStart() throws Exception { 083 int poolSize = endpoint.getConcurrentConsumers(); 084 executor = ExecutorServiceHelper.newFixedThreadPool(poolSize, endpoint.getEndpointUri(), true); 085 for (int i = 0; i < poolSize; i++) { 086 executor.execute(this); 087 } 088 endpoint.onStarted(this); 089 } 090 091 protected void doStop() throws Exception { 092 endpoint.onStopped(this); 093 094 executor.shutdownNow(); 095 executor = null; 096 } 097 098 }