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 org.apache.camel.AsyncCallback; 020import org.apache.camel.AsyncProcessor; 021import org.apache.camel.Endpoint; 022import org.apache.camel.Exchange; 023import org.apache.camel.ExchangePattern; 024import org.apache.camel.Producer; 025import org.apache.camel.util.ServiceHelper; 026import org.slf4j.Logger; 027import org.slf4j.LoggerFactory; 028 029import static org.apache.camel.processor.PipelineHelper.continueProcessing; 030 031/** 032 * {@link org.apache.camel.Processor} used to interceptor and detour the routing 033 * when using the {@link InterceptSendToEndpoint} functionality. 034 */ 035public class InterceptSendToEndpointProcessor extends DefaultAsyncProducer { 036 037 private static final Logger LOG = LoggerFactory.getLogger(InterceptSendToEndpointProcessor.class); 038 private final InterceptSendToEndpoint endpoint; 039 private final Endpoint delegate; 040 private final Producer producer; 041 private final boolean skip; 042 043 public InterceptSendToEndpointProcessor(InterceptSendToEndpoint endpoint, Endpoint delegate, Producer producer, boolean skip) throws Exception { 044 super(delegate); 045 this.endpoint = endpoint; 046 this.delegate = delegate; 047 this.producer = producer; 048 this.skip = skip; 049 } 050 051 public Endpoint getEndpoint() { 052 return producer.getEndpoint(); 053 } 054 055 public Exchange createExchange() { 056 return producer.createExchange(); 057 } 058 059 public Exchange createExchange(ExchangePattern pattern) { 060 return producer.createExchange(pattern); 061 } 062 063 @Deprecated 064 public Exchange createExchange(Exchange exchange) { 065 return producer.createExchange(exchange); 066 } 067 068 @Override 069 public boolean process(Exchange exchange, AsyncCallback callback) { 070 // process the detour so we do the detour routing 071 if (LOG.isDebugEnabled()) { 072 LOG.debug("Sending to endpoint: {} is intercepted and detoured to: {} for exchange: {}", new Object[]{getEndpoint(), endpoint.getDetour(), exchange}); 073 } 074 // add header with the real endpoint uri 075 exchange.getIn().setHeader(Exchange.INTERCEPTED_ENDPOINT, delegate.getEndpointUri()); 076 077 if (endpoint.getDetour() != null) { 078 // detour the exchange using synchronous processing 079 try { 080 endpoint.getDetour().process(exchange); 081 } catch (Exception e) { 082 exchange.setException(e); 083 } 084 } 085 086 // Decide whether to continue or not; similar logic to the Pipeline 087 // check for error if so we should break out 088 if (!continueProcessing(exchange, "skip sending to original intended destination: " + getEndpoint(), LOG)) { 089 callback.done(true); 090 return true; 091 } 092 093 // determine if we should skip or not 094 boolean shouldSkip = skip; 095 096 // if then interceptor had a when predicate, then we should only skip if it matched 097 Boolean whenMatches = (Boolean) exchange.removeProperty(Exchange.INTERCEPT_SEND_TO_ENDPOINT_WHEN_MATCHED); 098 if (whenMatches != null) { 099 shouldSkip = skip && whenMatches; 100 } 101 102 if (!shouldSkip) { 103 if (exchange.hasOut()) { 104 // replace OUT with IN as detour changed something 105 exchange.setIn(exchange.getOut()); 106 exchange.setOut(null); 107 } 108 109 // route to original destination leveraging the asynchronous routing engine if possible 110 if (producer instanceof AsyncProcessor) { 111 AsyncProcessor async = (AsyncProcessor) producer; 112 return async.process(exchange, callback); 113 } else { 114 try { 115 producer.process(exchange); 116 } catch (Exception e) { 117 exchange.setException(e); 118 } 119 callback.done(true); 120 return true; 121 } 122 } else { 123 if (LOG.isDebugEnabled()) { 124 LOG.debug("Stop() means skip sending exchange to original intended destination: {} for exchange: {}", getEndpoint(), exchange); 125 } 126 callback.done(true); 127 return true; 128 } 129 } 130 131 public boolean isSingleton() { 132 return producer.isSingleton(); 133 } 134 135 public void start() throws Exception { 136 ServiceHelper.startService(endpoint.getDetour()); 137 // here we also need to start the producer 138 ServiceHelper.startService(producer); 139 } 140 141 public void stop() throws Exception { 142 // do not stop detour as it should only be stopped when the interceptor stops 143 // we should stop the producer here 144 ServiceHelper.stopService(producer); 145 } 146 147}