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.processor; 018 019 import org.apache.camel.Exchange; 020 import org.apache.camel.Predicate; 021 import org.apache.camel.Processor; 022 import org.apache.camel.processor.exceptionpolicy.ExceptionPolicyStrategy; 023 024 /** 025 * Implements a <a 026 * href="http://camel.apache.org/dead-letter-channel.html">Dead Letter 027 * Channel</a> after attempting to redeliver the message using the 028 * {@link RedeliveryPolicy} 029 * 030 * @version $Revision: 784803 $ 031 */ 032 public class DeadLetterChannel extends RedeliveryErrorHandler { 033 034 /** 035 * Creates the dead letter channel. 036 * 037 * @param output outer processor that should use this dead letter channel 038 * @param logger logger to use for logging failures and redelivery attempts 039 * @param redeliveryProcessor an optional processor to run before redelivery attempt 040 * @param redeliveryPolicy policy for redelivery 041 * @param handledPolicy policy for handling failed exception that are moved to the dead letter queue 042 * @param exceptionPolicyStrategy strategy for onException handling 043 * @param deadLetter the failure processor to send failed exchanges to 044 * @param deadLetterUri an optional uri for logging purpose 045 * @param useOriginalBodyPolicy should the original IN body be moved to the dead letter queue or the current exchange IN body? 046 */ 047 public DeadLetterChannel(Processor output, Logger logger, Processor redeliveryProcessor, RedeliveryPolicy redeliveryPolicy, 048 Predicate handledPolicy, ExceptionPolicyStrategy exceptionPolicyStrategy, 049 Processor deadLetter, String deadLetterUri, boolean useOriginalBodyPolicy) { 050 super(output, logger, redeliveryProcessor, redeliveryPolicy, handledPolicy, deadLetter, deadLetterUri, useOriginalBodyPolicy); 051 setExceptionPolicy(exceptionPolicyStrategy); 052 } 053 054 public void process(Exchange exchange) throws Exception { 055 // just to let the stacktrace reveal that this is a dead letter channel 056 super.process(exchange); 057 } 058 059 @Override 060 public String toString() { 061 if (output == null) { 062 // if no output then dont do any description 063 return ""; 064 } 065 return "DeadLetterChannel[" + output + ", " + (deadLetterUri != null ? deadLetterUri : deadLetter) + "]"; 066 } 067 068 }