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.CamelContext; 020import org.apache.camel.CamelContextAware; 021import org.apache.camel.Exchange; 022import org.apache.camel.support.ServiceSupport; 023import org.apache.camel.util.ServiceHelper; 024 025import static org.apache.camel.util.ExchangeHelper.hasExceptionBeenHandledByErrorHandler; 026 027/** 028 * An {@link AggregationStrategy} which are used when the option <tt>shareUnitOfWork</tt> is enabled 029 * on EIPs such as multicast, splitter or recipientList. 030 * <p/> 031 * This strategy wraps the actual in use strategy to provide the logic needed for making shareUnitOfWork work. 032 * <p/> 033 * This strategy is <b>not</b> intended for end users to use. 034 */ 035public final class ShareUnitOfWorkAggregationStrategy extends ServiceSupport implements AggregationStrategy, DelegateAggregationStrategy { 036 037 private final AggregationStrategy strategy; 038 039 public ShareUnitOfWorkAggregationStrategy(AggregationStrategy strategy) { 040 this.strategy = strategy; 041 } 042 043 public AggregationStrategy getDelegate() { 044 return strategy; 045 } 046 047 public Exchange aggregate(Exchange oldExchange, Exchange newExchange) { 048 // aggregate using the actual strategy first 049 Exchange answer = strategy.aggregate(oldExchange, newExchange); 050 // ensure any errors is propagated from the new exchange to the answer 051 propagateFailure(answer, newExchange); 052 053 return answer; 054 } 055 056 protected void propagateFailure(Exchange answer, Exchange newExchange) { 057 // if new exchange failed then propagate all the error related properties to the answer 058 boolean exceptionHandled = hasExceptionBeenHandledByErrorHandler(newExchange); 059 if (newExchange.isFailed() || newExchange.isRollbackOnly() || exceptionHandled) { 060 if (newExchange.getException() != null) { 061 answer.setException(newExchange.getException()); 062 } 063 if (newExchange.getProperty(Exchange.EXCEPTION_CAUGHT) != null) { 064 answer.setProperty(Exchange.EXCEPTION_CAUGHT, newExchange.getProperty(Exchange.EXCEPTION_CAUGHT)); 065 } 066 if (newExchange.getProperty(Exchange.FAILURE_ENDPOINT) != null) { 067 answer.setProperty(Exchange.FAILURE_ENDPOINT, newExchange.getProperty(Exchange.FAILURE_ENDPOINT)); 068 } 069 if (newExchange.getProperty(Exchange.FAILURE_ROUTE_ID) != null) { 070 answer.setProperty(Exchange.FAILURE_ROUTE_ID, newExchange.getProperty(Exchange.FAILURE_ROUTE_ID)); 071 } 072 if (newExchange.getProperty(Exchange.ERRORHANDLER_HANDLED) != null) { 073 answer.setProperty(Exchange.ERRORHANDLER_HANDLED, newExchange.getProperty(Exchange.ERRORHANDLER_HANDLED)); 074 } 075 if (newExchange.getProperty(Exchange.FAILURE_HANDLED) != null) { 076 answer.setProperty(Exchange.FAILURE_HANDLED, newExchange.getProperty(Exchange.FAILURE_HANDLED)); 077 } 078 } 079 } 080 081 @Override 082 public String toString() { 083 return "ShareUnitOfWorkAggregationStrategy"; 084 } 085 086 @Override 087 protected void doStart() throws Exception { 088 ServiceHelper.startService(strategy); 089 } 090 091 @Override 092 protected void doStop() throws Exception { 093 ServiceHelper.stopAndShutdownServices(strategy); 094 } 095}