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comparison cake/libs/cache/xcache.php @ 0:261e66bd5a0c
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author | Shoshi TAMAKI <shoshi@cr.ie.u-ryukyu.ac.jp> |
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date | Sun, 24 Jul 2011 21:08:31 +0900 |
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1 <?php | |
2 /** | |
3 * Xcache storage engine for cache. | |
4 * | |
5 * PHP versions 4 and 5 | |
6 * | |
7 * CakePHP(tm) : Rapid Development Framework (http://cakephp.org) | |
8 * Copyright 2005-2010, Cake Software Foundation, Inc. (http://cakefoundation.org) | |
9 * | |
10 * Licensed under The MIT License | |
11 * Redistributions of files must retain the above copyright notice. | |
12 * | |
13 * @copyright Copyright 2005-2010, Cake Software Foundation, Inc. (http://cakefoundation.org) | |
14 * @link http://cakephp.org CakePHP(tm) Project | |
15 * @package cake | |
16 * @subpackage cake.cake.libs.cache | |
17 * @since CakePHP(tm) v 1.2.0.4947 | |
18 * @license MIT License (http://www.opensource.org/licenses/mit-license.php) | |
19 */ | |
20 | |
21 /** | |
22 * Xcache storage engine for cache | |
23 * | |
24 * @link http://trac.lighttpd.net/xcache/ Xcache | |
25 * @package cake | |
26 * @subpackage cake.cake.libs.cache | |
27 */ | |
28 class XcacheEngine extends CacheEngine { | |
29 | |
30 /** | |
31 * Settings | |
32 * | |
33 * - PHP_AUTH_USER = xcache.admin.user, default cake | |
34 * - PHP_AUTH_PW = xcache.admin.password, default cake | |
35 * | |
36 * @var array | |
37 * @access public | |
38 */ | |
39 var $settings = array(); | |
40 | |
41 /** | |
42 * Initialize the Cache Engine | |
43 * | |
44 * Called automatically by the cache frontend | |
45 * To reinitialize the settings call Cache::engine('EngineName', [optional] settings = array()); | |
46 * | |
47 * @param array $setting array of setting for the engine | |
48 * @return boolean True if the engine has been successfully initialized, false if not | |
49 * @access public | |
50 */ | |
51 function init($settings) { | |
52 parent::init(array_merge(array( | |
53 'engine' => 'Xcache', 'prefix' => Inflector::slug(APP_DIR) . '_', 'PHP_AUTH_USER' => 'user', 'PHP_AUTH_PW' => 'password' | |
54 ), $settings) | |
55 ); | |
56 return function_exists('xcache_info'); | |
57 } | |
58 | |
59 /** | |
60 * Write data for key into cache | |
61 * | |
62 * @param string $key Identifier for the data | |
63 * @param mixed $value Data to be cached | |
64 * @param integer $duration How long to cache the data, in seconds | |
65 * @return boolean True if the data was succesfully cached, false on failure | |
66 * @access public | |
67 */ | |
68 function write($key, &$value, $duration) { | |
69 $expires = time() + $duration; | |
70 xcache_set($key . '_expires', $expires, $duration); | |
71 return xcache_set($key, $value, $duration); | |
72 } | |
73 | |
74 /** | |
75 * Read a key from the cache | |
76 * | |
77 * @param string $key Identifier for the data | |
78 * @return mixed The cached data, or false if the data doesn't exist, has expired, or if there was an error fetching it | |
79 * @access public | |
80 */ | |
81 function read($key) { | |
82 if (xcache_isset($key)) { | |
83 $time = time(); | |
84 $cachetime = intval(xcache_get($key . '_expires')); | |
85 if ($cachetime < $time || ($time + $this->settings['duration']) < $cachetime) { | |
86 return false; | |
87 } | |
88 return xcache_get($key); | |
89 } | |
90 return false; | |
91 } | |
92 | |
93 /** | |
94 * Increments the value of an integer cached key | |
95 * If the cache key is not an integer it will be treated as 0 | |
96 * | |
97 * @param string $key Identifier for the data | |
98 * @param integer $offset How much to increment | |
99 * @param integer $duration How long to cache the data, in seconds | |
100 * @return New incremented value, false otherwise | |
101 * @access public | |
102 */ | |
103 function increment($key, $offset = 1) { | |
104 return xcache_inc($key, $offset); | |
105 } | |
106 | |
107 /** | |
108 * Decrements the value of an integer cached key. | |
109 * If the cache key is not an integer it will be treated as 0 | |
110 * | |
111 * @param string $key Identifier for the data | |
112 * @param integer $offset How much to substract | |
113 * @param integer $duration How long to cache the data, in seconds | |
114 * @return New decremented value, false otherwise | |
115 * @access public | |
116 */ | |
117 function decrement($key, $offset = 1) { | |
118 return xcache_dec($key, $offset); | |
119 } | |
120 /** | |
121 * Delete a key from the cache | |
122 * | |
123 * @param string $key Identifier for the data | |
124 * @return boolean True if the value was succesfully deleted, false if it didn't exist or couldn't be removed | |
125 * @access public | |
126 */ | |
127 function delete($key) { | |
128 return xcache_unset($key); | |
129 } | |
130 | |
131 /** | |
132 * Delete all keys from the cache | |
133 * | |
134 * @return boolean True if the cache was succesfully cleared, false otherwise | |
135 * @access public | |
136 */ | |
137 function clear() { | |
138 $this->__auth(); | |
139 $max = xcache_count(XC_TYPE_VAR); | |
140 for ($i = 0; $i < $max; $i++) { | |
141 xcache_clear_cache(XC_TYPE_VAR, $i); | |
142 } | |
143 $this->__auth(true); | |
144 return true; | |
145 } | |
146 | |
147 /** | |
148 * Populates and reverses $_SERVER authentication values | |
149 * Makes necessary changes (and reverting them back) in $_SERVER | |
150 * | |
151 * This has to be done because xcache_clear_cache() needs to pass Basic Http Auth | |
152 * (see xcache.admin configuration settings) | |
153 * | |
154 * @param boolean Revert changes | |
155 * @access private | |
156 */ | |
157 function __auth($reverse = false) { | |
158 static $backup = array(); | |
159 $keys = array('PHP_AUTH_USER' => 'user', 'PHP_AUTH_PW' => 'password'); | |
160 foreach ($keys as $key => $setting) { | |
161 if ($reverse) { | |
162 if (isset($backup[$key])) { | |
163 $_SERVER[$key] = $backup[$key]; | |
164 unset($backup[$key]); | |
165 } else { | |
166 unset($_SERVER[$key]); | |
167 } | |
168 } else { | |
169 $value = env($key); | |
170 if (!empty($value)) { | |
171 $backup[$key] = $value; | |
172 } | |
173 if (!empty($this->settings[$setting])) { | |
174 $_SERVER[$key] = $this->settings[$setting]; | |
175 } else if (!empty($this->settings[$key])) { | |
176 $_SERVER[$key] = $this->settings[$key]; | |
177 } else { | |
178 $_SERVER[$key] = $value; | |
179 } | |
180 } | |
181 } | |
182 } | |
183 } |