|
1
|
|
|
<?php |
|
2
|
|
|
/** |
|
3
|
|
|
* @link http://www.yiiframework.com/ |
|
4
|
|
|
* @copyright Copyright (c) 2008 Yii Software LLC |
|
5
|
|
|
* @license http://www.yiiframework.com/license/ |
|
6
|
|
|
*/ |
|
7
|
|
|
|
|
8
|
|
|
namespace yii\caching; |
|
9
|
|
|
|
|
10
|
|
|
/** |
|
11
|
|
|
* Dependency is the base class for cache dependency classes. |
|
12
|
|
|
* |
|
13
|
|
|
* Child classes should override its [[generateDependencyData()]] for generating |
|
14
|
|
|
* the actual dependency data. |
|
15
|
|
|
* |
|
16
|
|
|
* For more details and usage information on Cache, see the [guide article on caching](guide:caching-overview). |
|
17
|
|
|
* |
|
18
|
|
|
* @author Qiang Xue <[email protected]> |
|
19
|
|
|
* @since 2.0 |
|
20
|
|
|
*/ |
|
21
|
|
|
abstract class Dependency extends \yii\base\BaseObject |
|
22
|
|
|
{ |
|
23
|
|
|
/** |
|
24
|
|
|
* @var mixed the dependency data that is saved in cache and later is compared with the |
|
25
|
|
|
* latest dependency data. |
|
26
|
|
|
*/ |
|
27
|
|
|
public $data; |
|
28
|
|
|
/** |
|
29
|
|
|
* @var bool whether this dependency is reusable or not. True value means that dependent |
|
30
|
|
|
* data for this cache dependency will be generated only once per request. This allows you |
|
31
|
|
|
* to use the same cache dependency for multiple separate cache calls while generating the same |
|
32
|
|
|
* page without an overhead of re-evaluating dependency data each time. Defaults to false. |
|
33
|
|
|
*/ |
|
34
|
|
|
public $reusable = false; |
|
35
|
|
|
|
|
36
|
|
|
/** |
|
37
|
|
|
* @var array static storage of cached data for reusable dependencies. |
|
38
|
|
|
*/ |
|
39
|
|
|
private static $_reusableData = []; |
|
40
|
|
|
|
|
41
|
|
|
|
|
42
|
|
|
/** |
|
43
|
|
|
* Evaluates the dependency by generating and saving the data related with dependency. |
|
44
|
|
|
* This method is invoked by cache before writing data into it. |
|
45
|
|
|
* @param CacheInterface $cache the cache component that is currently evaluating this dependency |
|
46
|
|
|
*/ |
|
47
|
12 |
|
public function evaluateDependency($cache) |
|
48
|
|
|
{ |
|
49
|
12 |
|
if ($this->reusable) { |
|
50
|
|
|
$hash = $this->generateReusableHash(); |
|
51
|
|
|
if (!array_key_exists($hash, self::$_reusableData)) { |
|
52
|
|
|
self::$_reusableData[$hash] = $this->generateDependencyData($cache); |
|
53
|
|
|
} |
|
54
|
|
|
$this->data = self::$_reusableData[$hash]; |
|
55
|
|
|
} else { |
|
56
|
12 |
|
$this->data = $this->generateDependencyData($cache); |
|
57
|
|
|
} |
|
58
|
12 |
|
} |
|
59
|
|
|
|
|
60
|
|
|
/** |
|
61
|
|
|
* Checks whether the dependency is changed. |
|
62
|
|
|
* @param CacheInterface $cache the cache component that is currently evaluating this dependency |
|
63
|
|
|
* @return bool whether the dependency has changed. |
|
64
|
|
|
* @since 2.0.11 |
|
65
|
|
|
*/ |
|
66
|
6 |
|
public function isChanged($cache) |
|
67
|
|
|
{ |
|
68
|
6 |
|
if ($this->reusable) { |
|
69
|
|
|
$hash = $this->generateReusableHash(); |
|
70
|
|
|
if (!array_key_exists($hash, self::$_reusableData)) { |
|
71
|
|
|
self::$_reusableData[$hash] = $this->generateDependencyData($cache); |
|
72
|
|
|
} |
|
73
|
|
|
$data = self::$_reusableData[$hash]; |
|
74
|
|
|
} else { |
|
75
|
6 |
|
$data = $this->generateDependencyData($cache); |
|
76
|
|
|
} |
|
77
|
|
|
|
|
78
|
6 |
|
return $data !== $this->data; |
|
79
|
|
|
} |
|
80
|
|
|
|
|
81
|
|
|
/** |
|
82
|
|
|
* Resets all cached data for reusable dependencies. |
|
83
|
|
|
*/ |
|
84
|
1 |
|
public static function resetReusableData() |
|
85
|
|
|
{ |
|
86
|
1 |
|
self::$_reusableData = []; |
|
87
|
1 |
|
} |
|
88
|
|
|
|
|
89
|
|
|
/** |
|
90
|
|
|
* Generates a unique hash that can be used for retrieving reusable dependency data. |
|
91
|
|
|
* @return string a unique hash value for this cache dependency. |
|
92
|
|
|
* @see reusable |
|
93
|
|
|
*/ |
|
94
|
1 |
|
protected function generateReusableHash() |
|
95
|
|
|
{ |
|
96
|
1 |
|
$data = $this->data; |
|
97
|
1 |
|
$this->data = null; // https://github.com/yiisoft/yii2/issues/3052 |
|
98
|
1 |
|
$key = sha1(serialize($this)); |
|
99
|
1 |
|
$this->data = $data; |
|
100
|
1 |
|
return $key; |
|
101
|
|
|
} |
|
102
|
|
|
|
|
103
|
|
|
/** |
|
104
|
|
|
* Generates the data needed to determine if dependency is changed. |
|
105
|
|
|
* Derived classes should override this method to generate the actual dependency data. |
|
106
|
|
|
* @param CacheInterface $cache the cache component that is currently evaluating this dependency |
|
107
|
|
|
* @return mixed the data needed to determine if dependency has been changed. |
|
108
|
|
|
*/ |
|
109
|
|
|
abstract protected function generateDependencyData($cache); |
|
110
|
|
|
} |
|
111
|
|
|
|
yiisoft /
yii2
