CZendDataCache.php
3.38 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
<?php
/**
* CZendDataCache class file
*
* @author Steffen Dietz <steffo.dietz[at]googlemail[dot]com>
* @link http://www.yiiframework.com/
* @copyright Copyright © 2008-2011 Yii Software LLC
* @license http://www.yiiframework.com/license/
*/
/**
* CZendDataCache implements a cache application module based on the Zend Data Cache
* delivered with {@link http://www.zend.com/en/products/server/ ZendServer}.
*
* To use this application component, the Zend Data Cache PHP extension must be loaded.
*
* See {@link CCache} manual for common cache operations that are supported by CZendDataCache.
*
* @author Steffen Dietz <steffo.dietz[at]googlemail[dot]com>
* @version $Id$
* @package system.caching
*/
class CZendDataCache extends CCache
{
/**
* Initializes this application component.
* This method is required by the {@link IApplicationComponent} interface.
* It checks the availability of Zend Data Cache.
* @throws CException if Zend Data Cache extension is not loaded.
*/
public function init()
{
parent::init();
if(!function_exists('zend_shm_cache_store'))
throw new CException(Yii::t('yii','CZendDataCache requires PHP Zend Data Cache extension to be loaded.'));
}
/**
* Retrieves a value from cache with a specified key.
* This is the implementation of the method declared in the parent class.
* @param string $key a unique key identifying the cached value
* @return string the value stored in cache, false if the value is not in the cache or expired.
*/
protected function getValue($key)
{
$result = zend_shm_cache_fetch($key);
return $result !== NULL ? $result : false;
}
/**
* Stores a value identified by a key in cache.
* This is the implementation of the method declared in the parent class.
*
* @param string $key the key identifying the value to be cached
* @param string $value the value to be cached
* @param integer $expire the number of seconds in which the cached value will expire. 0 means never expire.
* @return boolean true if the value is successfully stored into cache, false otherwise
*/
protected function setValue($key,$value,$expire)
{
return zend_shm_cache_store($key,$value,$expire);
}
/**
* Stores a value identified by a key into cache if the cache does not contain this key.
* This is the implementation of the method declared in the parent class.
*
* @param string $key the key identifying the value to be cached
* @param string $value the value to be cached
* @param integer $expire the number of seconds in which the cached value will expire. 0 means never expire.
* @return boolean true if the value is successfully stored into cache, false otherwise
*/
protected function addValue($key,$value,$expire)
{
return (NULL === zend_shm_cache_fetch($key)) ? $this->setValue($key,$value,$expire) : false;
}
/**
* Deletes a value with the specified key from cache
* This is the implementation of the method declared in the parent class.
* @param string $key the key of the value to be deleted
* @return boolean if no error happens during deletion
*/
protected function deleteValue($key)
{
return zend_shm_cache_delete($key);
}
/**
* Deletes all values from cache.
* This is the implementation of the method declared in the parent class.
* @return boolean whether the flush operation was successful.
* @since 1.1.5
*/
protected function flushValues()
{
return zend_shm_cache_clear();
}
}