| /** |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.camel.processor; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| import java.util.concurrent.Callable; |
| import java.util.concurrent.ExecutorService; |
| |
| import org.apache.camel.AsyncCallback; |
| import org.apache.camel.Endpoint; |
| import org.apache.camel.Exchange; |
| import org.apache.camel.ExchangePattern; |
| import org.apache.camel.Expression; |
| import org.apache.camel.Processor; |
| import org.apache.camel.Producer; |
| import org.apache.camel.ProducerCallback; |
| import org.apache.camel.impl.DefaultExchange; |
| import org.apache.camel.util.ExchangeHelper; |
| import org.apache.camel.util.ObjectHelper; |
| |
| /** |
| * Processor for wire tapping exchanges to an endpoint destination. |
| * |
| * @version |
| */ |
| public class WireTapProcessor extends SendProcessor { |
| private final ExecutorService executorService; |
| |
| // expression or processor used for populating a new exchange to send |
| // as opposed to traditional wiretap that sends a copy of the original exchange |
| private Expression newExchangeExpression; |
| private List<Processor> newExchangeProcessors; |
| private boolean copy; |
| private Processor onPrepare; |
| |
| public WireTapProcessor(Endpoint destination, ExecutorService executorService) { |
| super(destination); |
| ObjectHelper.notNull(executorService, "executorService"); |
| this.executorService = executorService; |
| } |
| |
| public WireTapProcessor(Endpoint destination, ExchangePattern pattern, ExecutorService executorService) { |
| super(destination, pattern); |
| ObjectHelper.notNull(executorService, "executorService"); |
| this.executorService = executorService; |
| } |
| |
| @Override |
| public String toString() { |
| return "WireTap[" + destination.getEndpointUri() + "]"; |
| } |
| |
| @Override |
| public String getTraceLabel() { |
| return "wireTap(" + destination.getEndpointUri() + ")"; |
| } |
| |
| public void process(Exchange exchange) throws Exception { |
| if (!isStarted()) { |
| throw new IllegalStateException("WireTapProcessor has not been started: " + this); |
| } |
| |
| // must configure the wire tap beforehand |
| final Exchange wireTapExchange = configureExchange(exchange, pattern); |
| |
| // send the exchange to the destination using an executor service |
| executorService.submit(new Callable<Exchange>() { |
| public Exchange call() throws Exception { |
| return producerCache.doInProducer(destination, wireTapExchange, pattern, new ProducerCallback<Exchange>() { |
| public Exchange doInProducer(Producer producer, Exchange exchange, ExchangePattern pattern) throws Exception { |
| log.debug(">>>> (wiretap) {} {}", destination, exchange); |
| producer.process(exchange); |
| return exchange; |
| } |
| }); |
| }; |
| }); |
| } |
| |
| public boolean process(Exchange exchange, final AsyncCallback callback) { |
| if (!isStarted()) { |
| throw new IllegalStateException("WireTapProcessor has not been started: " + this); |
| } |
| |
| // must configure the wire tap beforehand |
| final Exchange wireTapExchange = configureExchange(exchange, pattern); |
| |
| // send the exchange to the destination using an executor service |
| executorService.submit(new Callable<Exchange>() { |
| public Exchange call() throws Exception { |
| return producerCache.doInProducer(destination, wireTapExchange, pattern, new ProducerCallback<Exchange>() { |
| public Exchange doInProducer(Producer producer, Exchange exchange, ExchangePattern pattern) throws Exception { |
| log.debug(">>>> (wiretap) {} {}", destination, exchange); |
| producer.process(exchange); |
| return exchange; |
| } |
| }); |
| }; |
| }); |
| |
| // continue routing this synchronously |
| callback.done(true); |
| return true; |
| } |
| |
| |
| @Override |
| protected Exchange configureExchange(Exchange exchange, ExchangePattern pattern) { |
| Exchange answer; |
| if (copy) { |
| // use a copy of the original exchange |
| answer = configureCopyExchange(exchange); |
| } else { |
| // use a new exchange |
| answer = configureNewExchange(exchange); |
| } |
| |
| // set property which endpoint we send to |
| answer.setProperty(Exchange.TO_ENDPOINT, destination.getEndpointUri()); |
| |
| // prepare the exchange |
| if (newExchangeExpression != null) { |
| Object body = newExchangeExpression.evaluate(answer, Object.class); |
| if (body != null) { |
| answer.getIn().setBody(body); |
| } |
| } |
| |
| if (newExchangeProcessors != null) { |
| for (Processor processor : newExchangeProcessors) { |
| try { |
| processor.process(answer); |
| } catch (Exception e) { |
| throw ObjectHelper.wrapRuntimeCamelException(e); |
| } |
| } |
| } |
| |
| // invoke on prepare on the exchange if specified |
| if (onPrepare != null) { |
| try { |
| onPrepare.process(exchange); |
| } catch (Exception e) { |
| throw ObjectHelper.wrapRuntimeCamelException(e); |
| } |
| } |
| |
| return answer; |
| } |
| |
| private Exchange configureCopyExchange(Exchange exchange) { |
| // must use a copy as we dont want it to cause side effects of the original exchange |
| Exchange copy = ExchangeHelper.createCorrelatedCopy(exchange, false); |
| // set MEP to InOnly as this wire tap is a fire and forget |
| copy.setPattern(ExchangePattern.InOnly); |
| return copy; |
| } |
| |
| private Exchange configureNewExchange(Exchange exchange) { |
| return new DefaultExchange(exchange.getFromEndpoint(), ExchangePattern.InOnly); |
| } |
| |
| public List<Processor> getNewExchangeProcessors() { |
| return newExchangeProcessors; |
| } |
| |
| public void setNewExchangeProcessors(List<Processor> newExchangeProcessors) { |
| this.newExchangeProcessors = newExchangeProcessors; |
| } |
| |
| public Expression getNewExchangeExpression() { |
| return newExchangeExpression; |
| } |
| |
| public void setNewExchangeExpression(Expression newExchangeExpression) { |
| this.newExchangeExpression = newExchangeExpression; |
| } |
| |
| public void addNewExchangeProcessor(Processor processor) { |
| if (newExchangeProcessors == null) { |
| newExchangeProcessors = new ArrayList<Processor>(); |
| } |
| newExchangeProcessors.add(processor); |
| } |
| |
| public boolean isCopy() { |
| return copy; |
| } |
| |
| public void setCopy(boolean copy) { |
| this.copy = copy; |
| } |
| |
| public Processor getOnPrepare() { |
| return onPrepare; |
| } |
| |
| public void setOnPrepare(Processor onPrepare) { |
| this.onPrepare = onPrepare; |
| } |
| |
| } |