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.impl; 018 019 import java.util.ArrayList; 020 import java.util.List; 021 import java.util.concurrent.CountDownLatch; 022 023 import org.apache.camel.AsyncCallback; 024 import org.apache.camel.Exchange; 025 import org.apache.camel.Service; 026 import org.apache.camel.spi.Synchronization; 027 import org.apache.camel.spi.UnitOfWork; 028 import org.apache.camel.util.UuidGenerator; 029 030 /** 031 * The default implementation of {@link UnitOfWork} 032 * 033 * @version $Revision: 52393 $ 034 */ 035 public class DefaultUnitOfWork implements UnitOfWork, Service { 036 private static final UuidGenerator DEFAULT_ID_GENERATOR = new UuidGenerator(); 037 038 private String id; 039 private List<Synchronization> synchronizations; 040 private List<AsyncCallback> asyncCallbacks; 041 private CountDownLatch latch; 042 043 public DefaultUnitOfWork() { 044 } 045 046 public void start() throws Exception { 047 } 048 049 public void stop() throws Exception { 050 // need to clean up when we are stopping to not leak memory 051 if (synchronizations != null) { 052 synchronizations.clear(); 053 } 054 if (asyncCallbacks != null) { 055 asyncCallbacks.clear(); 056 } 057 } 058 059 public synchronized void addSynchronization(Synchronization synchronization) { 060 if (synchronizations == null) { 061 synchronizations = new ArrayList<Synchronization>(); 062 } 063 synchronizations.add(synchronization); 064 } 065 066 public synchronized void removeSynchronization(Synchronization synchronization) { 067 if (synchronizations != null) { 068 synchronizations.remove(synchronization); 069 } 070 } 071 072 /** 073 * @deprecated will be removed in Camel 2.0 074 */ 075 public void reset() { 076 } 077 078 public void done(Exchange exchange) { 079 if (synchronizations != null) { 080 boolean failed = exchange.isFailed(); 081 for (Synchronization synchronization : synchronizations) { 082 if (failed) { 083 synchronization.onFailure(exchange); 084 } else { 085 synchronization.onComplete(exchange); 086 } 087 } 088 } 089 } 090 091 public boolean isSynchronous() { 092 return asyncCallbacks == null || asyncCallbacks.isEmpty(); 093 } 094 095 public String getId() { 096 if (id == null) { 097 id = DEFAULT_ID_GENERATOR.generateId(); 098 } 099 return id; 100 } 101 102 /** 103 * Register some asynchronous processing step 104 */ 105 /* 106 public synchronized AsyncCallback addAsyncStep() { 107 AsyncCallback answer = new AsyncCallback() { 108 public void done(boolean doneSynchronously) { 109 latch.countDown(); 110 } 111 }; 112 if (latch == null) { 113 latch = new CountDownLatch(1); 114 } 115 else { 116 // TODO increment latch! 117 } 118 if (asyncCallbacks == null) { 119 asyncCallbacks = new ArrayList<AsyncCallback>(); 120 } 121 asyncCallbacks.add(answer); 122 return answer; 123 } 124 */ 125 }