savepoint.h
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1 /*
2  * Copyright (C) 2003-2005 Tommi Maekitalo
3  *
4  * This library is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU Lesser General Public
6  * License as published by the Free Software Foundation; either
7  * version 2.1 of the License, or (at your option) any later version.
8  *
9  * As a special exception, you may use this file as part of a free
10  * software library without restriction. Specifically, if other files
11  * instantiate templates or use macros or inline functions from this
12  * file, or you compile this file and link it with other files to
13  * produce an executable, this file does not by itself cause the
14  * resulting executable to be covered by the GNU General Public
15  * License. This exception does not however invalidate any other
16  * reasons why the executable file might be covered by the GNU Library
17  * General Public License.
18  *
19  * This library is distributed in the hope that it will be useful,
20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
22  * Lesser General Public License for more details.
23  *
24  * You should have received a copy of the GNU Lesser General Public
25  * License along with this library; if not, write to the Free Software
26  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
27  */
28 
29 
30 #ifndef TNT_SAVEPOINT_H
31 #define TNT_SAVEPOINT_H
32 
33 #include <tnt/httpreply.h>
34 
35 namespace tnt
36 {
37  class Savepoint
38  {
39  bool active;
40  HttpReply& reply;
41  std::string::size_type pos;
42 
43  public:
44  Savepoint(HttpReply& reply_, bool active_ = true)
45  : active(false),
46  reply(reply_)
47  {
48  if (active_)
49  save();
50  }
52  {
53  if (active)
54  rollback();
55  }
56 
57  void save();
58  void commit();
59  void rollback();
60  };
61 }
62 
63 #endif // TNT_SAVEPOINT_H