1 /*
2 * $Source$
3 * $Revision$
4 *
5 * Copyright (C) 2000 William Chesters
6 *
7 * Part of Melati (http://melati.org), a framework for the rapid
8 * development of clean, maintainable web applications.
9 *
10 * Melati is free software; Permission is granted to copy, distribute
11 * and/or modify this software under the terms either:
12 *
13 * a) the GNU General Public License as published by the Free Software
14 * Foundation; either version 2 of the License, or (at your option)
15 * any later version,
16 *
17 * or
18 *
19 * b) any version of the Melati Software License, as published
20 * at http://melati.org
21 *
22 * You should have received a copy of the GNU General Public License and
23 * the Melati Software License along with this program;
24 * if not, write to the Free Software Foundation, Inc.,
25 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA to obtain the
26 * GNU General Public License and visit http://melati.org to obtain the
27 * Melati Software License.
28 *
29 * Feel free to contact the Developers of Melati (http://melati.org),
30 * if you would like to work out a different arrangement than the options
31 * outlined here. It is our intention to allow Melati to be used by as
32 * wide an audience as possible.
33 *
34 * This program is distributed in the hope that it will be useful,
35 * but WITHOUT ANY WARRANTY; without even the implied warranty of
36 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
37 * GNU General Public License for more details.
38 *
39 * Contact details for copyright holder:
40 *
41 * William Chesters <williamc At paneris.org>
42 * http://paneris.org/~williamc
43 * Obrechtstraat 114, 2517VX Den Haag, The Netherlands
44 */
45
46 package org.melati.poem;
47
48 import java.sql.Connection;
49 import java.sql.SQLException;
50
51 import org.melati.poem.transaction.Transaction;
52
53 /**
54 * A set of dbms actions, which can be rolled back if necessary.
55 */
56 public class PoemTransaction extends Transaction {
57 private Database database;
58 private Connection connection;
59
60 /**
61 * Constructor.
62 */
63 public PoemTransaction(Database database, Connection connection, int index) {
64 super(database, index);
65 this.database = database;
66 this.connection = connection;
67 try {
68 connection.setAutoCommit(false);
69 }
70 catch (SQLException e) {
71 throw new SQLSeriousPoemException(e);
72 }
73 }
74
75 /**
76 * @return the Database this PoemTransaction relates to
77 */
78 public final Database getDatabase() {
79 return database;
80 }
81
82 final Connection getConnection() {
83 return connection;
84 }
85
86 protected void backingCommit() {
87 try {
88 connection.commit();
89 if (database.logCommits()) database.log(new CommitLogEvent(this));
90 }
91 catch (SQLException e) {
92 throw new CommitFailedPoemException(e);
93 }
94 }
95
96 protected void backingRollback() {
97 try {
98 // MySQL closes idle connections by default
99 if(connection.isClosed()){
100 if (database.logCommits()) database.log(
101 "No rollback on closed connection for "
102 + new RollbackLogEvent(this));
103 } else {
104 connection.rollback();
105 if (database.logCommits()) database.log(new RollbackLogEvent(this));
106 }
107 }
108 catch (SQLException e) {
109 throw new RollbackFailedPoemException(e);
110 }
111 }
112
113 /**
114 * Close the transaction, committing or rolling back,
115 * notifying the database that we are closed.
116 * @param commit whether to commit before closing
117 */
118 public void close(boolean commit) {
119 try {
120 if (commit)
121 commit();
122 else
123 rollback();
124 }
125 finally {
126 database.notifyClosed(this);
127 }
128 }
129
130 /**
131 * {@inheritDoc}
132 * @see org.melati.poem.transaction.Transaction#toString()
133 */
134 public String toString() {
135 return database.getName() + "/" + super.toString();
136 }
137 }
138
139