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1   /*
2    * Copyright 2006-2007 the original author or authors.
3    *
4    * Licensed under the Apache License, Version 2.0 (the "License");
5    * you may not use this file except in compliance with the License.
6    * You may obtain a copy of the License at
7    *
8    *      http://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   * See the License for the specific language governing permissions and
14   * limitations under the License.
15   */
16  
17  package org.springframework.batch.support.transaction;
18  
19  import java.util.Stack;
20  
21  import org.springframework.transaction.TransactionDefinition;
22  import org.springframework.transaction.TransactionException;
23  import org.springframework.transaction.support.AbstractPlatformTransactionManager;
24  import org.springframework.transaction.support.DefaultTransactionStatus;
25  import org.springframework.transaction.support.TransactionSynchronizationManager;
26  
27  public class ResourcelessTransactionManager extends AbstractPlatformTransactionManager {
28  
29      @Override
30  	protected void doBegin(Object transaction, TransactionDefinition definition) throws TransactionException {
31  		((ResourcelessTransaction) transaction).begin();
32  	}
33  
34      @Override
35  	protected void doCommit(DefaultTransactionStatus status) throws TransactionException {
36  		logger.debug("Committing resourceless transaction on [" + status.getTransaction() + "]");
37  	}
38  
39      @Override
40  	protected Object doGetTransaction() throws TransactionException {
41  		Object transaction = new ResourcelessTransaction();
42  		Stack<Object> resources;
43  		if (!TransactionSynchronizationManager.hasResource(this)) {
44  			resources = new Stack<Object>();
45  			TransactionSynchronizationManager.bindResource(this, resources);
46  		}
47  		else {
48  			@SuppressWarnings("unchecked")
49  			Stack<Object> stack = (Stack<Object>) TransactionSynchronizationManager.getResource(this);
50  			resources = stack;
51  		}
52  		resources.push(transaction);
53  		return transaction;
54  	}
55  
56      @Override
57  	protected void doRollback(DefaultTransactionStatus status) throws TransactionException {
58  		logger.debug("Rolling back resourceless transaction on [" + status.getTransaction() + "]");
59  	}
60  
61      @Override
62  	protected boolean isExistingTransaction(Object transaction) throws TransactionException {
63  		if (TransactionSynchronizationManager.hasResource(this)) {
64  			@SuppressWarnings("unchecked")
65  			Stack<Object> stack = (Stack<Object>) TransactionSynchronizationManager.getResource(this);
66  			return stack.size() > 1;
67  		}
68  		return ((ResourcelessTransaction) transaction).isActive();
69  	}
70  
71      @Override
72  	protected void doSetRollbackOnly(DefaultTransactionStatus status) throws TransactionException {
73  	}
74  
75      @Override
76  	protected void doCleanupAfterCompletion(Object transaction) {
77  		@SuppressWarnings("unchecked")
78  		Stack<Object> list = (Stack<Object>) TransactionSynchronizationManager.getResource(this);
79  		Stack<Object> resources = list;
80  		resources.clear();
81  		TransactionSynchronizationManager.unbindResource(this);
82  		((ResourcelessTransaction) transaction).clear();
83  	}
84  
85  	private static class ResourcelessTransaction {
86  
87  		private boolean active = false;
88  
89  		public boolean isActive() {
90  			return active;
91  		}
92  
93  		public void begin() {
94  			active = true;
95  		}
96  
97  		public void clear() {
98  			active = false;
99  		}
100 
101 	}
102 
103 }