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The Core Camel Java DSL based router
/**
* 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.impl;
import java.util.Map;
import org.apache.camel.AsyncCallback;
import org.apache.camel.AsyncProcessor;
import org.apache.camel.CamelContext;
import org.apache.camel.Consumer;
import org.apache.camel.Endpoint;
import org.apache.camel.EndpointConfiguration;
import org.apache.camel.Exchange;
import org.apache.camel.ExchangePattern;
import org.apache.camel.PollingConsumer;
import org.apache.camel.Processor;
import org.apache.camel.Producer;
import org.apache.camel.ShutdownableService;
import org.apache.camel.util.ServiceHelper;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import static org.apache.camel.processor.PipelineHelper.continueProcessing;
/**
* This is an endpoint when sending to it, is intercepted and is routed in a detour
*
* @version
*/
public class InterceptSendToEndpoint implements Endpoint, ShutdownableService {
private static final Logger LOG = LoggerFactory.getLogger(InterceptSendToEndpoint.class);
private final Endpoint delegate;
private Producer producer;
private Processor detour;
private boolean skip;
/**
* Intercepts sending to the given endpoint
*
* @param destination the original endpoint
* @param skip true to skip sending after the detour to the original endpoint
*/
public InterceptSendToEndpoint(final Endpoint destination, boolean skip) {
this.delegate = destination;
this.skip = skip;
}
public void setDetour(Processor detour) {
this.detour = detour;
}
public Endpoint getDelegate() {
return delegate;
}
public String getEndpointUri() {
return delegate.getEndpointUri();
}
public EndpointConfiguration getEndpointConfiguration() {
return delegate.getEndpointConfiguration();
}
public String getEndpointKey() {
return delegate.getEndpointKey();
}
public Exchange createExchange() {
return delegate.createExchange();
}
public Exchange createExchange(ExchangePattern pattern) {
return delegate.createExchange(pattern);
}
@Deprecated
public Exchange createExchange(Exchange exchange) {
return delegate.createExchange(exchange);
}
public CamelContext getCamelContext() {
return delegate.getCamelContext();
}
public Producer createProducer() throws Exception {
producer = delegate.createProducer();
return new DefaultAsyncProducer(delegate) {
public Endpoint getEndpoint() {
return producer.getEndpoint();
}
public Exchange createExchange() {
return producer.createExchange();
}
public Exchange createExchange(ExchangePattern pattern) {
return producer.createExchange(pattern);
}
@Deprecated
public Exchange createExchange(Exchange exchange) {
return producer.createExchange(exchange);
}
@Override
public boolean process(Exchange exchange, AsyncCallback callback) {
// process the detour so we do the detour routing
if (LOG.isDebugEnabled()) {
LOG.debug("Sending to endpoint: {} is intercepted and detoured to: {} for exchange: {}", new Object[]{getEndpoint(), detour, exchange});
}
// add header with the real endpoint uri
exchange.getIn().setHeader(Exchange.INTERCEPTED_ENDPOINT, delegate.getEndpointUri());
// detour the exchange using synchronous processing
try {
detour.process(exchange);
} catch (Exception e) {
exchange.setException(e);
}
// Decide whether to continue or not; similar logic to the Pipeline
// check for error if so we should break out
if (!continueProcessing(exchange, "skip sending to original intended destination: " + getEndpoint(), LOG)) {
callback.done(true);
return true;
}
// determine if we should skip or not
boolean shouldSkip = skip;
// if then interceptor had a when predicate, then we should only skip if it matched
Boolean whenMatches = (Boolean) exchange.removeProperty(Exchange.INTERCEPT_SEND_TO_ENDPOINT_WHEN_MATCHED);
if (whenMatches != null) {
shouldSkip = skip && whenMatches;
}
if (!shouldSkip) {
if (exchange.hasOut()) {
// replace OUT with IN as detour changed something
exchange.setIn(exchange.getOut());
exchange.setOut(null);
}
// route to original destination leveraging the asynchronous routing engine if possible
if (producer instanceof AsyncProcessor) {
AsyncProcessor async = (AsyncProcessor) producer;
return async.process(exchange, callback);
} else {
try {
producer.process(exchange);
} catch (Exception e) {
exchange.setException(e);
}
callback.done(true);
return true;
}
} else {
if (LOG.isDebugEnabled()) {
LOG.debug("Stop() means skip sending exchange to original intended destination: {} for exchange: {}", getEndpoint(), exchange);
}
callback.done(true);
return true;
}
}
public boolean isSingleton() {
return producer.isSingleton();
}
public void start() throws Exception {
ServiceHelper.startService(detour);
// here we also need to start the producer
ServiceHelper.startService(producer);
}
public void stop() throws Exception {
// do not stop detour as it should only be stopped when the interceptor stops
// we should stop the producer here
ServiceHelper.stopService(producer);
}
};
}
public Consumer createConsumer(Processor processor) throws Exception {
return delegate.createConsumer(processor);
}
public PollingConsumer createPollingConsumer() throws Exception {
return delegate.createPollingConsumer();
}
public void configureProperties(Map options) {
delegate.configureProperties(options);
}
public void setCamelContext(CamelContext context) {
delegate.setCamelContext(context);
}
public boolean isLenientProperties() {
return delegate.isLenientProperties();
}
public boolean isSingleton() {
return delegate.isSingleton();
}
public void start() throws Exception {
ServiceHelper.startServices(detour, delegate);
}
public void stop() throws Exception {
ServiceHelper.stopServices(delegate, detour);
}
@Override
public void shutdown() throws Exception {
ServiceHelper.stopAndShutdownServices(delegate, detour);
}
@Override
public String toString() {
return delegate.toString();
}
}