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; 018 019import java.util.concurrent.CountDownLatch; 020 021import org.apache.camel.AsyncCallback; 022import org.apache.camel.AsyncProcessor; 023import org.apache.camel.Endpoint; 024import org.apache.camel.Exchange; 025import org.apache.camel.ExchangePattern; 026import org.apache.camel.Producer; 027import org.apache.camel.util.ServiceHelper; 028import org.slf4j.Logger; 029import org.slf4j.LoggerFactory; 030 031/** 032 * Ensures a {@link Producer} is executed within an {@link org.apache.camel.spi.UnitOfWork}. 033 * 034 * @version 035 */ 036public final class UnitOfWorkProducer implements Producer { 037 038 private static final Logger LOG = LoggerFactory.getLogger(UnitOfWorkProducer.class); 039 private final Producer producer; 040 private final AsyncProcessor processor; 041 042 /** 043 * The producer which should be executed within an {@link org.apache.camel.spi.UnitOfWork}. 044 * 045 * @param producer the producer 046 */ 047 public UnitOfWorkProducer(Producer producer) { 048 this.producer = producer; 049 // wrap in unit of work 050 CamelInternalProcessor internal = new CamelInternalProcessor(producer); 051 internal.addAdvice(new CamelInternalProcessor.UnitOfWorkProcessorAdvice(null)); 052 this.processor = internal; 053 } 054 055 public Endpoint getEndpoint() { 056 return producer.getEndpoint(); 057 } 058 059 public Exchange createExchange() { 060 return producer.createExchange(); 061 } 062 063 public Exchange createExchange(ExchangePattern pattern) { 064 return producer.createExchange(pattern); 065 } 066 067 @Deprecated 068 public Exchange createExchange(Exchange exchange) { 069 return producer.createExchange(exchange); 070 } 071 072 public void process(final Exchange exchange) throws Exception { 073 final CountDownLatch latch = new CountDownLatch(1); 074 boolean sync = processor.process(exchange, new AsyncCallback() { 075 public void done(boolean doneSync) { 076 if (!doneSync) { 077 LOG.trace("Asynchronous callback received for exchangeId: {}", exchange.getExchangeId()); 078 latch.countDown(); 079 } 080 } 081 082 @Override 083 public String toString() { 084 return "Done " + processor; 085 } 086 }); 087 if (!sync) { 088 LOG.trace("Waiting for asynchronous callback before continuing for exchangeId: {} -> {}", 089 exchange.getExchangeId(), exchange); 090 latch.await(); 091 LOG.trace("Asynchronous callback received, will continue routing exchangeId: {} -> {}", 092 exchange.getExchangeId(), exchange); 093 } 094 } 095 096 public void start() throws Exception { 097 ServiceHelper.startService(processor); 098 } 099 100 public void stop() throws Exception { 101 ServiceHelper.stopService(processor); 102 } 103 104 public boolean isSingleton() { 105 return producer.isSingleton(); 106 } 107 108 @Override 109 public String toString() { 110 return "UnitOfWork(" + producer + ")"; 111 } 112}