1/* -*- mode: C++; c-basic-offset: 4; indent-tabs-mode: nil -*- */
2#ident "$Id$"
3/*======
4This file is part of PerconaFT.
5
6
7Copyright (c) 2006, 2015, Percona and/or its affiliates. All rights reserved.
8
9 PerconaFT is free software: you can redistribute it and/or modify
10 it under the terms of the GNU General Public License, version 2,
11 as published by the Free Software Foundation.
12
13 PerconaFT is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with PerconaFT. If not, see <http://www.gnu.org/licenses/>.
20
21----------------------------------------
22
23 PerconaFT is free software: you can redistribute it and/or modify
24 it under the terms of the GNU Affero General Public License, version 3,
25 as published by the Free Software Foundation.
26
27 PerconaFT is distributed in the hope that it will be useful,
28 but WITHOUT ANY WARRANTY; without even the implied warranty of
29 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
30 GNU Affero General Public License for more details.
31
32 You should have received a copy of the GNU Affero General Public License
33 along with PerconaFT. If not, see <http://www.gnu.org/licenses/>.
34======= */
35
36#ident "Copyright (c) 2006, 2015, Percona and/or its affiliates. All rights reserved."
37
38#pragma once
39
40#include <db.h>
41
42#include "db_env.hpp"
43#include "exceptions.hpp"
44
45namespace ftcxx {
46
47 class DBTxn {
48 public:
49 DBTxn()
50 : _flags(0),
51 _txn(nullptr)
52 {}
53
54 explicit DBTxn(const DBEnv &env, int flags=0)
55 : _flags(flags),
56 _txn(nullptr)
57 {
58 DB_TXN *t;
59 int r = env.env()->txn_begin(env.env(), nullptr, &t, _flags);
60 handle_ft_retval(r);
61 _txn = t;
62 }
63
64 DBTxn(const DBEnv &env, const DBTxn &parent, int flags=0)
65 : _flags(flags),
66 _txn(nullptr)
67 {
68 DB_TXN *t;
69 int r = env.env()->txn_begin(env.env(), parent.txn(), &t, _flags);
70 handle_ft_retval(r);
71 _txn = t;
72 }
73
74 ~DBTxn() {
75 if (_txn) {
76 abort();
77 }
78 }
79
80 DBTxn(const DBTxn &) = delete;
81 DBTxn& operator=(const DBTxn &) = delete;
82
83 DBTxn(DBTxn &&o)
84 : _flags(0),
85 _txn(nullptr)
86 {
87 std::swap(_flags, o._flags);
88 std::swap(_txn, o._txn);
89 }
90
91 DBTxn& operator=(DBTxn &&o) {
92 std::swap(_flags, o._flags);
93 std::swap(_txn, o._txn);
94 return *this;
95 }
96
97 DB_TXN *txn() const { return _txn; }
98
99 void commit(int flags=0) {
100 int r = _txn->commit(_txn, flags);
101 handle_ft_retval(r);
102 _txn = nullptr;
103 }
104
105 void abort() {
106 int r = _txn->abort(_txn);
107 handle_ft_retval(r);
108 _txn = nullptr;
109 }
110
111 bool is_read_only() const {
112 return _flags & DB_TXN_READ_ONLY;
113 }
114
115 uint64_t id() const {
116 if (!_txn) {
117 return 0;
118 }
119 return _txn->id64(_txn);
120 }
121
122 private:
123 int _flags;
124 DB_TXN *_txn;
125 };
126
127} // namespace ftcxx
128