LocalTransactionManagerLookup


1   /*
2    * Copyright 2002-2006 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.orm.hibernate3;
18  
19  import java.util.Properties  ;
20  
21  import javax.transaction.TransactionManager  ;
22  
23  import org.hibernate.transaction.TransactionManagerLookup;
24  
25  /**
26   * Implementation of Hibernate's TransactionManagerLookup interface that
27   * returns a Spring-managed JTA TransactionManager, determined by
28   * LocalSessionFactoryBean's "transactionManager" property.
29   *
30   * <p>The main advantage of this TransactionManagerLookup is that it avoids
31   * double configuration of JTA specifics. A single TransactionManager bean can
32   * be used for both JtaTransactionManager and LocalSessionFactoryBean, with no
33   * JTA setup in Hibernate configuration.
34   *
35   * <p>Alternatively, use Hibernate's own TransactionManagerLookup implementations:
36   * Spring's JtaTransactionManager only requires a TransactionManager for suspending
37   * and resuming transactions, so you might not need to apply such special Spring
38   * configuration at all.
39   *
40   * @author Juergen Hoeller
41   * @since 1.2
42   * @see LocalSessionFactoryBean#setJtaTransactionManager
43   * @see org.springframework.transaction.jta.JtaTransactionManager#setTransactionManager
44   */
45  public class LocalTransactionManagerLookup implements TransactionManagerLookup {
46  
47      private final TransactionManager   transactionManager;
48  
49  
50      public LocalTransactionManagerLookup() {
51          TransactionManager   tm = LocalSessionFactoryBean.getConfigTimeTransactionManager();
52          // absolutely needs thread-bound DataSource to initialize
53          if (tm == null) {
54              throw new IllegalStateException  ("No JTA TransactionManager found - " +
55                  "jtaTransactionManager property must be set on LocalSessionFactoryBean");
56          }
57          this.transactionManager = tm;
58      }
59  
60      public TransactionManager   getTransactionManager(Properties   props) {
61          return transactionManager;
62      }
63  
64      public String   getUserTransactionName() {
65          return null;
66      }
67  
68  }
69
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