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 */ 017 package org.apache.camel.processor; 018 019 import org.apache.camel.Exchange; 020 import org.apache.camel.Processor; 021 import org.apache.camel.impl.DefaultUnitOfWork; 022 import static org.apache.camel.util.ObjectHelper.wrapRuntimeCamelException; 023 024 /** 025 * Handles calling the UnitOfWork.done() method when processing of an exchange 026 * is complete. 027 */ 028 public final class UnitOfWorkProcessor extends DelegateProcessor { 029 030 public UnitOfWorkProcessor(Processor processor) { 031 super(processor); 032 } 033 034 @Override 035 public String toString() { 036 return "UnitOfWork(" + processor + ")"; 037 } 038 039 @Override 040 protected void processNext(Exchange exchange) throws Exception { 041 if (exchange.getUnitOfWork() == null) { 042 // If there is no existing UoW, then we should start one and 043 // terminate it once processing is completed for the exchange. 044 final DefaultUnitOfWork uow = new DefaultUnitOfWork(exchange); 045 exchange.setUnitOfWork(uow); 046 try { 047 uow.start(); 048 } catch (Exception e) { 049 throw wrapRuntimeCamelException(e); 050 } 051 052 // process the exchange 053 try { 054 processor.process(exchange); 055 } catch (Exception e) { 056 exchange.setException(e); 057 } 058 059 // unit of work is done 060 exchange.getUnitOfWork().done(exchange); 061 try { 062 uow.stop(); 063 } catch (Exception e) { 064 throw wrapRuntimeCamelException(e); 065 } 066 exchange.setUnitOfWork(null); 067 } else { 068 // There was an existing UoW, so we should just pass through.. 069 // so that the guy the initiated the UoW can terminate it. 070 processor.process(exchange); 071 } 072 } 073 074 }