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.Map;
020
021 import org.apache.camel.AsyncCallback;
022 import org.apache.camel.AsyncProcessor;
023 import org.apache.camel.CamelContext;
024 import org.apache.camel.Consumer;
025 import org.apache.camel.Endpoint;
026 import org.apache.camel.EndpointConfiguration;
027 import org.apache.camel.Exchange;
028 import org.apache.camel.ExchangePattern;
029 import org.apache.camel.PollingConsumer;
030 import org.apache.camel.Processor;
031 import org.apache.camel.Producer;
032 import org.apache.camel.util.ServiceHelper;
033 import org.slf4j.Logger;
034 import org.slf4j.LoggerFactory;
035
036 import static org.apache.camel.processor.PipelineHelper.continueProcessing;
037
038 /**
039 * This is an endpoint when sending to it, is intercepted and is routed in a detour
040 *
041 * @version
042 */
043 public class InterceptSendToEndpoint implements Endpoint {
044
045 private static final Logger LOG = LoggerFactory.getLogger(InterceptSendToEndpoint.class);
046
047 private final Endpoint delegate;
048 private Producer producer;
049 private Processor detour;
050 private boolean skip;
051
052 /**
053 * Intercepts sending to the given endpoint
054 *
055 * @param destination the original endpoint
056 * @param skip <tt>true</tt> to skip sending after the detour to the original endpoint
057 */
058 public InterceptSendToEndpoint(final Endpoint destination, boolean skip) {
059 this.delegate = destination;
060 this.skip = skip;
061 }
062
063 public void setDetour(Processor detour) {
064 this.detour = detour;
065 }
066
067 public Endpoint getDelegate() {
068 return delegate;
069 }
070
071 public String getEndpointUri() {
072 return delegate.getEndpointUri();
073 }
074
075 public EndpointConfiguration getEndpointConfiguration() {
076 return delegate.getEndpointConfiguration();
077 }
078
079 public String getEndpointKey() {
080 return delegate.getEndpointKey();
081 }
082
083 public Exchange createExchange() {
084 return delegate.createExchange();
085 }
086
087 public Exchange createExchange(ExchangePattern pattern) {
088 return delegate.createExchange(pattern);
089 }
090
091 public Exchange createExchange(Exchange exchange) {
092 return delegate.createExchange(exchange);
093 }
094
095 public CamelContext getCamelContext() {
096 return delegate.getCamelContext();
097 }
098
099 public Producer createProducer() throws Exception {
100 producer = delegate.createProducer();
101 return new DefaultAsyncProducer(delegate) {
102
103 public Endpoint getEndpoint() {
104 return producer.getEndpoint();
105 }
106
107 public Exchange createExchange() {
108 return producer.createExchange();
109 }
110
111 public Exchange createExchange(ExchangePattern pattern) {
112 return producer.createExchange(pattern);
113 }
114
115 public Exchange createExchange(Exchange exchange) {
116 return producer.createExchange(exchange);
117 }
118
119 @Override
120 public boolean process(Exchange exchange, AsyncCallback callback) {
121 // process the detour so we do the detour routing
122 if (LOG.isDebugEnabled()) {
123 LOG.debug("Sending to endpoint: {} is intercepted and detoured to: {} for exchange: {}", new Object[]{getEndpoint(), detour, exchange});
124 }
125 // add header with the real endpoint uri
126 exchange.getIn().setHeader(Exchange.INTERCEPTED_ENDPOINT, delegate.getEndpointUri());
127
128 // detour the exchange using synchronous processing
129 try {
130 detour.process(exchange);
131 } catch (Exception e) {
132 exchange.setException(e);
133 callback.done(true);
134 return true;
135 }
136
137 // Decide whether to continue or not; similar logic to the Pipeline
138 // check for error if so we should break out
139 if (!continueProcessing(exchange, "skip sending to original intended destination: " + getEndpoint(), LOG)) {
140 callback.done(true);
141 return true;
142 }
143
144 // determine if we should skip or not
145 boolean shouldSkip = skip;
146
147 // if then interceptor had a when predicate, then we should only skip if it matched
148 Boolean whenMatches = (Boolean) exchange.removeProperty(Exchange.INTERCEPT_SEND_TO_ENDPOINT_WHEN_MATCHED);
149 if (whenMatches != null) {
150 shouldSkip = skip && whenMatches;
151 }
152
153 if (!shouldSkip) {
154 if (exchange.hasOut()) {
155 // replace OUT with IN as detour changed something
156 exchange.setIn(exchange.getOut());
157 exchange.setOut(null);
158 }
159
160 // route to original destination leveraging the asynchronous routing engine if possible
161 if (producer instanceof AsyncProcessor) {
162 AsyncProcessor async = (AsyncProcessor) producer;
163 return async.process(exchange, callback);
164 } else {
165 try {
166 producer.process(exchange);
167 } catch (Exception e) {
168 exchange.setException(e);
169 }
170 callback.done(true);
171 return true;
172 }
173 } else {
174 if (LOG.isDebugEnabled()) {
175 LOG.debug("Stop() means skip sending exchange to original intended destination: {} for exchange: {}", getEndpoint(), exchange);
176 }
177 callback.done(true);
178 return true;
179 }
180 }
181
182 public boolean isSingleton() {
183 return producer.isSingleton();
184 }
185
186 public void start() throws Exception {
187 ServiceHelper.startService(detour);
188 // here we also need to start the producer
189 ServiceHelper.startService(producer);
190 }
191
192 public void stop() throws Exception {
193 // do not stop detour as it should only be stopped when the interceptor stops
194 // we should stop the producer here
195 ServiceHelper.stopService(producer);
196 }
197 };
198 }
199
200 public Consumer createConsumer(Processor processor) throws Exception {
201 return delegate.createConsumer(processor);
202 }
203
204 public PollingConsumer createPollingConsumer() throws Exception {
205 return delegate.createPollingConsumer();
206 }
207
208 public void configureProperties(Map<String, Object> options) {
209 delegate.configureProperties(options);
210 }
211
212 public void setCamelContext(CamelContext context) {
213 delegate.setCamelContext(context);
214 }
215
216 public boolean isLenientProperties() {
217 return delegate.isLenientProperties();
218 }
219
220 public boolean isSingleton() {
221 return delegate.isSingleton();
222 }
223
224 public void start() throws Exception {
225 ServiceHelper.startServices(detour, delegate);
226 }
227
228 public void stop() throws Exception {
229 ServiceHelper.stopServices(delegate, detour);
230 }
231
232 @Override
233 public String toString() {
234 return delegate.toString();
235 }
236 }