| /** |
| * 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.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * An {@link org.apache.camel.processor.ErrorHandler} used as a safe fallback when |
| * processing by other error handlers such as the {@link org.apache.camel.model.OnExceptionDefinition}. |
| * |
| * @version |
| */ |
| public class FatalFallbackErrorHandler extends DelegateAsyncProcessor implements ErrorHandler { |
| |
| private static final Logger LOG = LoggerFactory.getLogger(FatalFallbackErrorHandler.class); |
| |
| public FatalFallbackErrorHandler(Processor processor) { |
| super(processor); |
| } |
| |
| @Override |
| protected boolean processNext(final Exchange exchange, final AsyncCallback callback) { |
| // support the asynchronous routing engine |
| boolean sync = super.processNext(exchange, new AsyncCallback() { |
| public void done(boolean doneSync) { |
| if (exchange.getException() != null) { |
| // an exception occurred during processing onException |
| |
| // log detailed error message with as much detail as possible |
| Throwable previous = exchange.getProperty(Exchange.EXCEPTION_CAUGHT, Throwable.class); |
| String msg = "Exception occurred while trying to handle previously thrown exception on exchangeId: " |
| + exchange.getExchangeId() + " using: [" + processor + "]."; |
| if (previous != null) { |
| msg += " The previous and the new exception will be logged in the following."; |
| LOG.error(msg); |
| LOG.error("\\--> Previous exception on exchangeId: " + exchange.getExchangeId() , previous); |
| LOG.error("\\--> New exception on exchangeId: " + exchange.getExchangeId(), exchange.getException()); |
| } else { |
| LOG.error(msg); |
| LOG.error("\\--> New exception on exchangeId: " + exchange.getExchangeId(), exchange.getException()); |
| } |
| |
| // we can propagated that exception to the caught property on the exchange |
| // which will shadow any previously caught exception and cause this new exception |
| // to be visible in the error handler |
| exchange.setProperty(Exchange.EXCEPTION_CAUGHT, exchange.getException()); |
| |
| // mark this exchange as already been error handler handled (just by having this property) |
| // the false value mean the caught exception will be kept on the exchange, causing the |
| // exception to be propagated back to the caller, and to break out routing |
| exchange.setProperty(Exchange.ERRORHANDLER_HANDLED, false); |
| } |
| callback.done(doneSync); |
| } |
| }); |
| |
| return sync; |
| } |
| |
| @Override |
| public String toString() { |
| return "FatalFallbackErrorHandler[" + processor + "]"; |
| } |
| } |