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 */ 017package org.apache.camel.builder; 018 019import org.apache.camel.Endpoint; 020import org.apache.camel.ExchangePattern; 021import org.apache.camel.LoggingLevel; 022import org.apache.camel.NoSuchEndpointException; 023import org.apache.camel.Processor; 024import org.apache.camel.processor.DeadLetterChannel; 025import org.apache.camel.processor.FatalFallbackErrorHandler; 026import org.apache.camel.processor.SendProcessor; 027import org.apache.camel.spi.RouteContext; 028import org.apache.camel.util.CamelLogger; 029import org.apache.camel.util.ObjectHelper; 030import org.slf4j.LoggerFactory; 031 032/** 033 * A builder of a <a 034 * href="http://camel.apache.org/dead-letter-channel.html">Dead Letter 035 * Channel</a> 036 * 037 * @version 038 */ 039public class DeadLetterChannelBuilder extends DefaultErrorHandlerBuilder { 040 041 public DeadLetterChannelBuilder() { 042 // no-arg constructor used by Spring DSL 043 } 044 045 public DeadLetterChannelBuilder(Endpoint deadLetter) { 046 setDeadLetter(deadLetter); 047 // DLC do not log exhausted by default 048 getRedeliveryPolicy().setLogExhausted(false); 049 } 050 051 public DeadLetterChannelBuilder(String uri) { 052 setDeadLetterUri(uri); 053 } 054 055 public Processor createErrorHandler(RouteContext routeContext, Processor processor) throws Exception { 056 validateDeadLetterUri(routeContext); 057 058 DeadLetterChannel answer = new DeadLetterChannel(routeContext.getCamelContext(), processor, getLogger(), getOnRedelivery(), 059 getRedeliveryPolicy(), getExceptionPolicyStrategy(), getFailureProcessor(), getDeadLetterUri(), isDeadLetterHandleNewException(), 060 isUseOriginalMessage(), getRetryWhilePolicy(routeContext.getCamelContext()), getExecutorService(routeContext.getCamelContext()), 061 getOnPrepareFailure(), getOnExceptionOccurred()); 062 // configure error handler before we can use it 063 configure(routeContext, answer); 064 return answer; 065 } 066 067 public boolean supportTransacted() { 068 return false; 069 } 070 071 @Override 072 public ErrorHandlerBuilder cloneBuilder() { 073 DeadLetterChannelBuilder answer = new DeadLetterChannelBuilder(); 074 super.cloneBuilder(answer); 075 return answer; 076 } 077 078 // Properties 079 // ------------------------------------------------------------------------- 080 081 public Processor getFailureProcessor() { 082 if (failureProcessor == null) { 083 // wrap in our special safe fallback error handler if sending to dead letter channel fails 084 Processor child = new SendProcessor(deadLetter, ExchangePattern.InOnly); 085 // force MEP to be InOnly so when sending to DLQ we would not expect a reply if the MEP was InOut 086 failureProcessor = new FatalFallbackErrorHandler(child, true); 087 } 088 return failureProcessor; 089 } 090 091 protected void validateDeadLetterUri(RouteContext routeContext) { 092 if (deadLetter == null) { 093 ObjectHelper.notEmpty(deadLetterUri, "deadLetterUri", this); 094 deadLetter = routeContext.getCamelContext().getEndpoint(deadLetterUri); 095 if (deadLetter == null) { 096 throw new NoSuchEndpointException(deadLetterUri); 097 } 098 } 099 } 100 101 protected CamelLogger createLogger() { 102 return new CamelLogger(LoggerFactory.getLogger(DeadLetterChannel.class), LoggingLevel.ERROR); 103 } 104 105 @Override 106 public String toString() { 107 return "DeadLetterChannelBuilder(" + deadLetterUri + ")"; 108 } 109}