1 /*
2 * Hibernate, Relational Persistence for Idiomatic Java
3 *
4 * Copyright (c) 2008, Red Hat Middleware LLC or third-party contributors as
5 * indicated by the @author tags or express copyright attribution
6 * statements applied by the authors. All third-party contributions are
7 * distributed under license by Red Hat Middleware LLC.
8 *
9 * This copyrighted material is made available to anyone wishing to use, modify,
10 * copy, or redistribute it subject to the terms and conditions of the GNU
11 * Lesser General Public License, as published by the Free Software Foundation.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
15 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
16 * for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public License
19 * along with this distribution; if not, write to:
20 * Free Software Foundation, Inc.
21 * 51 Franklin Street, Fifth Floor
22 * Boston, MA 02110-1301 USA
23 *
24 */
25 package org.hibernate.engine;
26
27 import java.io.Serializable;
28 import java.sql.Connection;
29 import java.sql.SQLException;
30
31 import org.hibernate.HibernateException;
32 import org.hibernate.engine.transaction.IsolatedWork;
33 import org.hibernate.engine.transaction.Isolater;
34 import org.hibernate.exception.JDBCExceptionHelper;
35
36 /**
37 * Allows work to be done outside the current transaction, by suspending it,
38 * and performing work in a new transaction
39 *
40 * @author Emmanuel Bernard
41 */
42 public abstract class TransactionHelper {
43
44 // todo : remove this and just have subclasses use Isolater/IsolatedWork directly...
45
46 /**
47 * The work to be done
48 */
49 protected abstract Serializable doWorkInCurrentTransaction(Connection conn, String sql) throws SQLException;
50
51 /**
52 * Suspend the current transaction and perform work in a new transaction
53 */
54 public Serializable doWorkInNewTransaction(final SessionImplementor session)
55 throws HibernateException {
56 class Work implements IsolatedWork {
57 Serializable generatedValue;
58 public void doWork(Connection connection) throws HibernateException {
59 String sql = null;
60 try {
61 generatedValue = doWorkInCurrentTransaction( connection, sql );
62 }
63 catch( SQLException sqle ) {
64 throw JDBCExceptionHelper.convert(
65 session.getFactory().getSQLExceptionConverter(),
66 sqle,
67 "could not get or update next value",
68 sql
69 );
70 }
71 }
72 }
73 Work work = new Work();
74 Isolater.doIsolatedWork( work, session );
75 return work.generatedValue;
76 }
77 }
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