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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.processor;
import org.apache.camel.AsyncCallback;
import org.apache.camel.Exchange;
import org.apache.camel.Processor;
import org.apache.camel.Traceable;
import org.apache.camel.spi.IdAware;
import org.apache.camel.util.ExchangeHelper;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Processor to handle do finally supporting asynchronous routing engine
*
* @version
*/
public class FinallyProcessor extends DelegateAsyncProcessor implements Traceable, IdAware {
private static final Logger LOG = LoggerFactory.getLogger(FinallyProcessor.class);
private String id;
public FinallyProcessor(Processor processor) {
super(processor);
}
@Override
public boolean process(final Exchange exchange, final AsyncCallback callback) {
// clear exception and fault so finally block can be executed
final boolean fault;
if (exchange.hasOut()) {
fault = exchange.getOut().isFault();
exchange.getOut().setFault(false);
} else {
fault = exchange.getIn().isFault();
exchange.getIn().setFault(false);
}
final Exception exception = exchange.getException();
exchange.setException(null);
// but store the caught exception as a property
if (exception != null) {
exchange.setProperty(Exchange.EXCEPTION_CAUGHT, exception);
}
// store the last to endpoint as the failure endpoint
if (exchange.getProperty(Exchange.FAILURE_ENDPOINT) == null) {
exchange.setProperty(Exchange.FAILURE_ENDPOINT, exchange.getProperty(Exchange.TO_ENDPOINT));
}
// continue processing
return processor.process(exchange, new FinallyAsyncCallback(exchange, callback, exception, fault));
}
@Override
public String toString() {
return "Finally{" + getProcessor() + "}";
}
public String getTraceLabel() {
return "finally";
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
private static final class FinallyAsyncCallback implements AsyncCallback {
private final Exchange exchange;
private final AsyncCallback callback;
private final Exception exception;
private final boolean fault;
public FinallyAsyncCallback(Exchange exchange, AsyncCallback callback, Exception exception, boolean fault) {
this.exchange = exchange;
this.callback = callback;
this.exception = exception;
this.fault = fault;
}
@Override
public void done(boolean doneSync) {
try {
if (exception == null) {
exchange.removeProperty(Exchange.FAILURE_ENDPOINT);
} else {
// set exception back on exchange
exchange.setException(exception);
exchange.setProperty(Exchange.EXCEPTION_CAUGHT, exception);
}
// set fault flag back
if (fault) {
if (exchange.hasOut()) {
exchange.getOut().setFault(true);
} else {
exchange.getIn().setFault(true);
}
}
if (!doneSync) {
// signal callback to continue routing async
ExchangeHelper.prepareOutToIn(exchange);
LOG.trace("Processing complete for exchangeId: {} >>> {}", exchange.getExchangeId(), exchange);
}
} finally {
// callback must always be called
callback.done(doneSync);
}
}
@Override
public String toString() {
return "FinallyAsyncCallback";
}
}
}