01: /**
02: * com.mckoi.database.TransactionModificationListener 07 Mar 2003
03: *
04: * Mckoi SQL Database ( http://www.mckoi.com/database )
05: * Copyright (C) 2000, 2001, 2002 Diehl and Associates, Inc.
06: *
07: * This program is free software; you can redistribute it and/or
08: * modify it under the terms of the GNU General Public License
09: * Version 2 as published by the Free Software Foundation.
10: *
11: * This program is distributed in the hope that it will be useful,
12: * but WITHOUT ANY WARRANTY; without even the implied warranty of
13: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14: * GNU General Public License Version 2 for more details.
15: *
16: * You should have received a copy of the GNU General Public License
17: * Version 2 along with this program; if not, write to the Free Software
18: * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
19: *
20: * Change Log:
21: *
22: *
23: */package com.mckoi.database;
24:
25: /**
26: * A listener that is notified of table modification events made by a
27: * transaction, both immediately inside a transaction and when a transaction
28: * commits. These events can occur either immediately before or immediately
29: * after the data is modified or during a commit.
30: *
31: * @author Tobias Downer
32: */
33:
34: public interface TransactionModificationListener {
35:
36: /**
37: * An action for when changes to a table are committed. This event occurs
38: * after constraint checks, and before the change is actually committed to
39: * the database. If this method generates an exception then the change
40: * is rolled back and any changes made by the transaction are lost. This
41: * action is generated inside a 'commit lock' of the conglomerate, and
42: * therefore care should be taken with the performance of this method.
43: * <p>
44: * The event object provides access to a SimpleTransaction object that is a
45: * read-only view of the database in its committed state (if this operation
46: * is successful). The transaction can be used to perform any last minute
47: * deferred constraint checks.
48: * <p>
49: * This action is useful for last minute abortion of a transaction, or for
50: * updating cache information. It can not be used as a triggering mechanism
51: * and should never call back to user code.
52: */
53: void tableCommitChange(TableCommitModificationEvent event);
54:
55: }
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