|
1
|
|
|
<?php |
|
2
|
|
|
|
|
3
|
|
|
namespace itertools; |
|
4
|
|
|
|
|
5
|
|
|
use Exception; |
|
6
|
|
|
use IteratorIterator; |
|
7
|
|
|
use itertools\IterUtil; |
|
8
|
|
|
use PDO; |
|
9
|
|
|
|
|
10
|
|
|
/** |
|
11
|
|
|
* When adding this itertator to a for loop you can automatically |
|
12
|
|
|
* batch updates in a transaction to speed up inserts or updates. |
|
13
|
|
|
* |
|
14
|
|
|
* Example: |
|
15
|
|
|
* foreach (new TimedAutoTransactionBatchIterator($entities, $pdo) as $entity) { |
|
16
|
|
|
* $this->pdo->exec('UPDATE entity SET counter = counter + 1 WHERE id = ' . (int) $entity->getId()); |
|
17
|
|
|
* // Batching updates in a transaction can be have a huge performance improvement |
|
18
|
|
|
* // By default the commit happens every second. Be aware, long transactions can cause dead locks |
|
19
|
|
|
* } |
|
20
|
|
|
*/ |
|
21
|
|
|
class TimedAutoTransactionBatchIterator extends IteratorIterator |
|
22
|
|
|
{ |
|
23
|
|
|
const START_TRANSACTION = -1; |
|
24
|
|
|
|
|
25
|
|
|
protected $timeout; |
|
26
|
|
|
protected $pdo; |
|
27
|
|
|
protected $nextCommitTime = self::START_TRANSACTION; |
|
28
|
|
|
protected $inTransaction = false; |
|
29
|
|
|
|
|
30
|
|
|
public function __construct($iterator, PDO $pdo, $timeout = 1.0 /** s */) |
|
31
|
|
|
{ |
|
32
|
|
|
parent::__construct(IterUtil::asTraversable($iterator)); |
|
33
|
|
|
$this->timeout = $timeout; |
|
34
|
|
|
$this->pdo = $pdo; |
|
35
|
|
|
} |
|
36
|
|
|
|
|
37
|
|
|
public function valid() |
|
38
|
|
|
{ |
|
39
|
|
|
$valid = parent::valid(); |
|
40
|
|
|
if (! $valid) { |
|
41
|
|
|
$this->commitIfInTransaction(); |
|
42
|
|
|
return false; |
|
43
|
|
|
} |
|
44
|
|
|
if (microtime(true) >= $this->nextCommitTime) { |
|
45
|
|
|
$this->nextCommitTime = self::START_TRANSACTION; |
|
46
|
|
|
$this->commitIfInTransaction(); |
|
47
|
|
|
} |
|
48
|
|
|
if (self::START_TRANSACTION == $this->nextCommitTime) { |
|
49
|
|
|
$this->pdo->beginTransaction(); |
|
50
|
|
|
$this->inTransaction = true; |
|
51
|
|
|
$this->nextCommitTime = microtime(true) + $this->timeout; |
|
52
|
|
|
} |
|
53
|
|
|
return true; |
|
54
|
|
|
} |
|
55
|
|
|
|
|
56
|
|
|
public function commitIfInTransaction() |
|
57
|
|
|
{ |
|
58
|
|
|
if(! $this->inTransaction) { |
|
59
|
|
|
return; |
|
60
|
|
|
} |
|
61
|
|
|
try { |
|
62
|
|
|
$this->pdo->commit(); |
|
63
|
|
|
$this->inTransaction = false; |
|
64
|
|
|
} catch(Exception $e) { |
|
65
|
|
|
$this->pdo->rollBack(); |
|
66
|
|
|
$this->inTransaction = false; |
|
67
|
|
|
throw $e; |
|
68
|
|
|
} |
|
69
|
|
|
} |
|
70
|
|
|
|
|
71
|
|
|
public function __destruct() |
|
72
|
|
|
{ |
|
73
|
|
|
if (! $this->inTransaction) { |
|
74
|
|
|
return; |
|
75
|
|
|
} |
|
76
|
|
|
// this can only be destructed in transaction if exception occured |
|
77
|
|
|
$this->pdo->rollBack(); |
|
78
|
|
|
} |
|
79
|
|
|
} |
|
80
|
|
|
|
|
81
|
|
|
|
SuRaMoN /
itertools
