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 org.apache.camel.Consumer;
020    import org.apache.camel.Exchange;
021    import org.apache.camel.Processor;
022    import org.apache.camel.spi.ExceptionHandler;
023    
024    /**
025     * An {@link ExceptionHandler} that uses the {@link DefaultConsumer} to
026     * process the caused exception to send the message into the Camel routing engine
027     * which allows to let the routing engine handle the exception.
028     * <p/>
029     * An endpoint can be configured with <tt>consumer.bridgeErrorHandler=true</tt> in the URI
030     * to enable this {@link BridgeExceptionHandlerToErrorHandler} on the consumer.
031     * The consumer must extend the {@link DefaultConsumer}, to support this, if not an
032     * {@link IllegalArgumentException} is thrown upon startup.
033     * <p/>
034     * <b>Notice:</b> When using this bridging error handler, then interceptors, onCompletions
035     * does <b>not</b> apply. The {@link Exchange} is processed directly by the Camel
036     * error handler, and does not allow prior actions such as interceptors, onCompletion
037     * to take action.
038     */
039    public class BridgeExceptionHandlerToErrorHandler implements ExceptionHandler {
040    
041        private final LoggingExceptionHandler fallback;
042        private final Consumer consumer;
043        private final Processor bridge;
044    
045        public BridgeExceptionHandlerToErrorHandler(DefaultConsumer consumer) {
046            this.consumer = consumer;
047            this.fallback = new LoggingExceptionHandler(consumer.getEndpoint().getCamelContext(), consumer.getClass());
048            this.bridge = consumer.getProcessor();
049        }
050    
051        @Override
052        public void handleException(Throwable exception) {
053            handleException(null, exception);
054        }
055    
056        @Override
057        public void handleException(String message, Throwable exception) {
058            handleException(message, null, exception);
059        }
060    
061        @Override
062        public void handleException(String message, Exchange exchange, Throwable exception) {
063            if (exchange == null) {
064                exchange = consumer.getEndpoint().createExchange();
065            }
066    
067            // set the caused exception
068            exchange.setException(exception);
069            // and the message
070            exchange.getIn().setBody(message);
071            // and mark as redelivery exhausted as we cannot do redeliveries
072            exchange.setProperty(Exchange.REDELIVERY_EXHAUSTED, Boolean.TRUE);
073    
074            try {
075                bridge.process(exchange);
076            } catch (Exception e) {
077                fallback.handleException("Error handling exception " + exception.getMessage(), exchange, e);
078            }
079        }
080    }