|
1
|
|
|
<?php |
|
2
|
|
|
|
|
3
|
|
|
namespace SilverStripe\ORM\Connect; |
|
4
|
|
|
|
|
5
|
|
|
/** |
|
6
|
|
|
* TransactionManager decorator that adds virtual nesting support. |
|
7
|
|
|
* Because this is managed in PHP and not the database, it has the following limitations: |
|
8
|
|
|
* - Committing a nested transaction won't change anything until the parent transaction is committed |
|
9
|
|
|
* - Rolling back a nested transaction means that the parent transaction must be rolled backed |
|
10
|
|
|
* |
|
11
|
|
|
* DBAL describes this behaviour nicely in their docs: https://www.doctrine-project.org/projects/doctrine-dbal/en/2.8/reference/transactions.html#transaction-nesting |
|
12
|
|
|
*/ |
|
13
|
|
|
|
|
14
|
|
|
class NestedTransactionManager implements TransactionManager |
|
15
|
|
|
{ |
|
16
|
|
|
|
|
17
|
|
|
/** |
|
18
|
|
|
* @var int |
|
19
|
|
|
*/ |
|
20
|
|
|
protected $transactionNesting = 0; |
|
21
|
|
|
|
|
22
|
|
|
/** |
|
23
|
|
|
* @var TransactionManager |
|
24
|
|
|
*/ |
|
25
|
|
|
protected $child; |
|
26
|
|
|
|
|
27
|
|
|
/** |
|
28
|
|
|
* Set to true if all transactions must roll back to the parent |
|
29
|
|
|
* @var boolean |
|
30
|
|
|
*/ |
|
31
|
|
|
protected $mustRollback = false; |
|
32
|
|
|
|
|
33
|
|
|
/** |
|
34
|
|
|
* Create a NestedTransactionManager |
|
35
|
|
|
* @param TransactionManager $child The transaction manager that will handle the topmost transaction |
|
36
|
|
|
*/ |
|
37
|
|
|
public function __construct(TransactionManager $child) |
|
38
|
|
|
{ |
|
39
|
|
|
$this->child = $child; |
|
40
|
|
|
} |
|
41
|
|
|
|
|
42
|
|
|
/** |
|
43
|
|
|
* Start a transaction |
|
44
|
|
|
* @throws DatabaseException on failure |
|
45
|
|
|
* @return bool True on success |
|
46
|
|
|
*/ |
|
47
|
|
|
public function transactionStart($transactionMode = false, $sessionCharacteristics = false) |
|
48
|
|
|
{ |
|
49
|
|
|
if ($this->transactionNesting <= 0) { |
|
50
|
|
|
$this->transactionNesting = 1; |
|
51
|
|
|
$this->child->transactionStart($transactionMode, $sessionCharacteristics); |
|
52
|
|
|
} else { |
|
53
|
|
|
if ($this->child->supportsSavepoints()) { |
|
54
|
|
|
$this->child->transactionSavepoint("nesting" . $this->transactionNesting); |
|
55
|
|
|
} |
|
56
|
|
|
$this->transactionNesting++; |
|
57
|
|
|
} |
|
58
|
|
|
} |
|
59
|
|
|
|
|
60
|
|
|
public function transactionEnd($chain = false) |
|
61
|
|
|
{ |
|
62
|
|
|
if ($this->mustRollback) { |
|
63
|
|
|
throw new DatabaseException("Child transaction was rolled back, so parent can't be committed"); |
|
64
|
|
|
} |
|
65
|
|
|
|
|
66
|
|
|
if ($this->transactionNesting < 1) { |
|
67
|
|
|
throw new DatabaseException("Not within a transaction, so can't commit"); |
|
68
|
|
|
} |
|
69
|
|
|
|
|
70
|
|
|
$this->transactionNesting--; |
|
71
|
|
|
|
|
72
|
|
|
if ($this->transactionNesting === 0) { |
|
73
|
|
|
$this->child->transactionEnd(); |
|
74
|
|
|
} |
|
75
|
|
|
|
|
76
|
|
|
if ($chain) { |
|
77
|
|
|
return $this->transactionStart(); |
|
78
|
|
|
} |
|
79
|
|
|
} |
|
80
|
|
|
|
|
81
|
|
|
public function transactionRollback($savepoint = null) |
|
82
|
|
|
{ |
|
83
|
|
|
if ($this->transactionNesting < 1) { |
|
84
|
|
|
throw new DatabaseException("Not within a transaction, so can't roll back"); |
|
85
|
|
|
} |
|
86
|
|
|
|
|
87
|
|
|
if ($savepoint) { |
|
88
|
|
|
return $this->child->transactionRollback($savepoint); |
|
89
|
|
|
} |
|
90
|
|
|
|
|
91
|
|
|
$this->transactionNesting--; |
|
92
|
|
|
|
|
93
|
|
|
if ($this->transactionNesting === 0) { |
|
94
|
|
|
$this->child->transactionRollback(); |
|
95
|
|
|
$this->mustRollback = false; |
|
96
|
|
|
} else { |
|
97
|
|
|
if ($this->child->supportsSavepoints()) { |
|
98
|
|
|
$this->child->transactionRollback("nesting" . $this->transactionNesting); |
|
99
|
|
|
$this->mustRollback = false; |
|
100
|
|
|
|
|
101
|
|
|
// Without savepoints, parent transactions must roll back if a child one has |
|
102
|
|
|
} else { |
|
103
|
|
|
$this->mustRollback = true; |
|
104
|
|
|
} |
|
105
|
|
|
} |
|
106
|
|
|
} |
|
107
|
|
|
|
|
108
|
|
|
/** |
|
109
|
|
|
* Return the depth of the transaction. |
|
110
|
|
|
* |
|
111
|
|
|
* @return int |
|
112
|
|
|
*/ |
|
113
|
|
|
public function transactionDepth() |
|
114
|
|
|
{ |
|
115
|
|
|
return $this->transactionNesting; |
|
116
|
|
|
} |
|
117
|
|
|
|
|
118
|
|
|
public function transactionSavepoint($savepoint) |
|
119
|
|
|
{ |
|
120
|
|
|
return $this->child->transactionSavepoint($savepoint); |
|
121
|
|
|
} |
|
122
|
|
|
|
|
123
|
|
|
public function supportsSavepoints() |
|
124
|
|
|
{ |
|
125
|
|
|
return $this->child->supportsSavepoints(); |
|
126
|
|
|
} |
|
127
|
|
|
} |
|
128
|
|
|
|
sminnee /
silverstripe-framework
