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.Processor;
023import org.apache.camel.processor.FatalFallbackErrorHandler;
024import org.apache.camel.processor.SendProcessor;
025import org.apache.camel.processor.errorhandler.DeadLetterChannel;
026import org.apache.camel.spi.CamelLogger;
027import org.slf4j.LoggerFactory;
028
029/**
030 * A builder of a
031 * <a href="http://camel.apache.org/dead-letter-channel.html">Dead Letter
032 * Channel</a>
033 */
034public class DeadLetterChannelBuilder extends DefaultErrorHandlerBuilder {
035
036    public DeadLetterChannelBuilder() {
037        // no-arg constructor used by Spring DSL
038    }
039
040    public DeadLetterChannelBuilder(Endpoint deadLetter) {
041        setDeadLetter(deadLetter);
042        // DLC do not log exhausted by default
043        getRedeliveryPolicy().setLogExhausted(false);
044    }
045
046    public DeadLetterChannelBuilder(String uri) {
047        setDeadLetterUri(uri);
048    }
049
050    @Override
051    public ErrorHandlerBuilder cloneBuilder() {
052        DeadLetterChannelBuilder answer = new DeadLetterChannelBuilder();
053        super.cloneBuilder(answer);
054        return answer;
055    }
056
057    // Properties
058    // -------------------------------------------------------------------------
059
060    @Override
061    public Processor getFailureProcessor() {
062        if (failureProcessor == null) {
063            // wrap in our special safe fallback error handler if sending to
064            // dead letter channel fails
065            Processor child = new SendProcessor(deadLetter, ExchangePattern.InOnly);
066            // force MEP to be InOnly so when sending to DLQ we would not expect
067            // a reply if the MEP was InOut
068            failureProcessor = new FatalFallbackErrorHandler(child, true);
069        }
070        return failureProcessor;
071    }
072
073    @Override
074    protected CamelLogger createLogger() {
075        return new CamelLogger(LoggerFactory.getLogger(DeadLetterChannel.class), LoggingLevel.ERROR);
076    }
077
078    @Override
079    public String toString() {
080        return "DeadLetterChannelBuilder(" + deadLetterUri + ")";
081    }
082}