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.processor.aggregate; 018 019import org.apache.camel.Exchange; 020 021import static org.apache.camel.util.ExchangeHelper.hasExceptionBeenHandledByErrorHandler; 022 023/** 024 * An {@link AggregationStrategy} which are used when the option <tt>shareUnitOfWork</tt> is enabled 025 * on EIPs such as multicast, splitter or recipientList. 026 * <p/> 027 * This strategy wraps the actual in use strategy to provide the logic needed for making shareUnitOfWork work. 028 * <p/> 029 * This strategy is <b>not</b> intended for end users to use. 030 */ 031public final class ShareUnitOfWorkAggregationStrategy implements AggregationStrategy, DelegateAggregationStrategy { 032 033 private final AggregationStrategy strategy; 034 035 public ShareUnitOfWorkAggregationStrategy(AggregationStrategy strategy) { 036 this.strategy = strategy; 037 } 038 039 public AggregationStrategy getDelegate() { 040 return strategy; 041 } 042 043 public Exchange aggregate(Exchange oldExchange, Exchange newExchange) { 044 // aggreagate using the actual strategy first 045 Exchange answer = strategy.aggregate(oldExchange, newExchange); 046 // ensure any errors is propagated from the new exchange to the answer 047 propagateFailure(answer, newExchange); 048 049 return answer; 050 } 051 052 protected void propagateFailure(Exchange answer, Exchange newExchange) { 053 // if new exchange failed then propagate all the error related properties to the answer 054 boolean exceptionHandled = hasExceptionBeenHandledByErrorHandler(newExchange); 055 if (newExchange.isFailed() || newExchange.isRollbackOnly() || exceptionHandled) { 056 if (newExchange.getException() != null) { 057 answer.setException(newExchange.getException()); 058 } 059 if (newExchange.getProperty(Exchange.EXCEPTION_CAUGHT) != null) { 060 answer.setProperty(Exchange.EXCEPTION_CAUGHT, newExchange.getProperty(Exchange.EXCEPTION_CAUGHT)); 061 } 062 if (newExchange.getProperty(Exchange.FAILURE_ENDPOINT) != null) { 063 answer.setProperty(Exchange.FAILURE_ENDPOINT, newExchange.getProperty(Exchange.FAILURE_ENDPOINT)); 064 } 065 if (newExchange.getProperty(Exchange.FAILURE_ROUTE_ID) != null) { 066 answer.setProperty(Exchange.FAILURE_ROUTE_ID, newExchange.getProperty(Exchange.FAILURE_ROUTE_ID)); 067 } 068 if (newExchange.getProperty(Exchange.ERRORHANDLER_HANDLED) != null) { 069 answer.setProperty(Exchange.ERRORHANDLER_HANDLED, newExchange.getProperty(Exchange.ERRORHANDLER_HANDLED)); 070 } 071 if (newExchange.getProperty(Exchange.FAILURE_HANDLED) != null) { 072 answer.setProperty(Exchange.FAILURE_HANDLED, newExchange.getProperty(Exchange.FAILURE_HANDLED)); 073 } 074 } 075 } 076 077 @Override 078 public String toString() { 079 return "ShareUnitOfWorkAggregationStrategy"; 080 } 081}