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.processor; 018 019 import java.util.concurrent.Callable; 020 import java.util.concurrent.ExecutorService; 021 022 import org.apache.camel.Endpoint; 023 import org.apache.camel.Exchange; 024 import org.apache.camel.ExchangePattern; 025 import org.apache.camel.Expression; 026 import org.apache.camel.Processor; 027 import org.apache.camel.Producer; 028 import org.apache.camel.ProducerCallback; 029 import org.apache.camel.impl.DefaultExchange; 030 import org.apache.camel.util.ObjectHelper; 031 import org.apache.camel.util.concurrent.ExecutorServiceHelper; 032 033 /** 034 * Processor for wire tapping exchanges to an endpoint destination. 035 * 036 * @version $Revision: 792977 $ 037 */ 038 public class WireTapProcessor extends SendProcessor { 039 040 private ExecutorService executorService; 041 042 // expression or processor used for populating a new exchange to send 043 // as opposed to traditional wiretap that sends a copy of the original exchange 044 private Expression newExchangeExpression; 045 private Processor newExchangeProcessor; 046 047 public WireTapProcessor(Endpoint destination) { 048 super(destination); 049 } 050 051 public WireTapProcessor(Endpoint destination, ExchangePattern pattern) { 052 super(destination, pattern); 053 } 054 055 @Override 056 protected void doStart() throws Exception { 057 super.doStart(); 058 } 059 060 @Override 061 protected void doStop() throws Exception { 062 if (executorService != null) { 063 executorService.shutdown(); 064 } 065 super.doStop(); 066 } 067 068 @Override 069 public String toString() { 070 return "WireTap[" + destination.getEndpointUri() + "]"; 071 } 072 073 public void process(Exchange exchange) throws Exception { 074 getProducerCache(exchange).doInProducer(destination, exchange, pattern, new ProducerCallback<Exchange>() { 075 public Exchange doInProducer(Producer producer, Exchange exchange, ExchangePattern pattern) throws Exception { 076 Exchange wireTapExchange = configureExchange(exchange, pattern); 077 procesWireTap(producer, wireTapExchange); 078 return wireTapExchange; 079 } 080 }); 081 } 082 083 /** 084 * Wiretaps the exchange. 085 * 086 * @param exchange the exchange to wire tap 087 */ 088 protected void procesWireTap(final Producer producer, final Exchange exchange) { 089 // use submit instead of execute to force it to use a new thread, execute might 090 // decide to use current thread, so we must submit a new task 091 // as we dont care for the response we dont hold the future object and wait for the result 092 getExecutorService().submit(new Callable<Exchange>() { 093 public Exchange call() throws Exception { 094 if (LOG.isDebugEnabled()) { 095 LOG.debug("Processing wiretap: " + exchange); 096 } 097 producer.process(exchange); 098 return exchange; 099 } 100 }); 101 } 102 103 @Override 104 protected Exchange configureExchange(Exchange exchange, ExchangePattern pattern) { 105 if (newExchangeProcessor == null && newExchangeExpression == null) { 106 // use a copy of the original exchange 107 return configureCopyExchange(exchange); 108 } else { 109 // use a new exchange 110 return configureNewExchange(exchange); 111 } 112 } 113 114 private Exchange configureCopyExchange(Exchange exchange) { 115 // must use a copy as we dont want it to cause side effects of the original exchange 116 Exchange copy = exchange.copy(false); 117 // set MEP to InOnly as this wire tap is a fire and forget 118 copy.setPattern(ExchangePattern.InOnly); 119 return copy; 120 } 121 122 private Exchange configureNewExchange(Exchange exchange) { 123 Exchange answer = new DefaultExchange(exchange.getContext(), ExchangePattern.InOnly); 124 // use destination os origin of this new exchange 125 answer.setFromEndpoint(getDestination()); 126 127 // prepare the exchange 128 if (newExchangeProcessor != null) { 129 try { 130 newExchangeProcessor.process(answer); 131 } catch (Exception e) { 132 throw ObjectHelper.wrapRuntimeCamelException(e); 133 } 134 } else { 135 Object body = newExchangeExpression.evaluate(answer, Object.class); 136 if (body != null) { 137 answer.getIn().setBody(body); 138 } 139 } 140 141 return answer; 142 } 143 144 public ExecutorService getExecutorService() { 145 if (executorService == null) { 146 executorService = createExecutorService(); 147 } 148 return executorService; 149 } 150 151 private ExecutorService createExecutorService() { 152 return ExecutorServiceHelper.newScheduledThreadPool(5, this.toString(), true); 153 } 154 155 public void setExecutorService(ExecutorService executorService) { 156 this.executorService = executorService; 157 } 158 159 public Processor getNewExchangeProcessor() { 160 return newExchangeProcessor; 161 } 162 163 public void setNewExchangeProcessor(Processor newExchangeProcessor) { 164 this.newExchangeProcessor = newExchangeProcessor; 165 } 166 167 public Expression getNewExchangeExpression() { 168 return newExchangeExpression; 169 } 170 171 public void setNewExchangeExpression(Expression newExchangeExpression) { 172 this.newExchangeExpression = newExchangeExpression; 173 } 174 }