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93a50078 S |
1 | <?php |
2 | /** | |
3 | * @author Jan Altensen (Stricted) | |
4 | * @copyright 2013-2014 Jan Altensen (Stricted) | |
5 | * @license GNU Lesser General Public License <http://opensource.org/licenses/lgpl-license.php> | |
6 | */ | |
7 | class APC { | |
8 | /** | |
9 | * php extension | |
10 | * @var string | |
11 | */ | |
12 | protected $apcu = false; | |
13 | ||
14 | /** | |
15 | * APC(u) version | |
16 | * @var integer | |
17 | */ | |
18 | public $version = 0; | |
19 | ||
20 | /** | |
701c06d4 | 21 | * Constructs a new instance of APC class. |
93a50078 S |
22 | */ |
23 | public function __construct () { | |
24 | if (extension_loaded("apcu")) { | |
25 | $this->apcu = true; | |
26 | $this->version = phpversion('apcu'); | |
5f6347bf S |
27 | } |
28 | else if (extension_loaded("apc")) { | |
93a50078 | 29 | $this->version = phpversion('apc'); |
5f6347bf S |
30 | } |
31 | else { | |
93a50078 S |
32 | throw new Exception('APC/APCu support is not enabled.'); |
33 | } | |
34 | } | |
35 | ||
36 | /** | |
37 | * deletes a cache item | |
38 | * | |
39 | * @param string $key | |
40 | * @return boolean | |
41 | */ | |
42 | public function delete ($key) { | |
43 | if ($this->exists($key)) { | |
44 | if ($this->apcu) { | |
45 | return apcu_delete($key); | |
46 | } | |
47 | else { | |
48 | return apc_delete($key); | |
49 | } | |
50 | } | |
51 | } | |
52 | ||
53 | /** | |
54 | * fetch a cache item | |
55 | * | |
56 | * @param string $key | |
57 | * @return string | |
58 | */ | |
59 | public function fetch ($key) { | |
60 | if ($this->exists($key)) { | |
61 | $cacheTime = $this->getCacheTime($key); | |
be1fac5b | 62 | if ($cacheTime['ttl'] > 0 && (time() - $cacheTime['mtime']) > $cacheTime['ttl']) { |
93a50078 S |
63 | $this->delete($key); |
64 | return null; | |
65 | } | |
66 | ||
67 | if ($this->apcu) { | |
68 | return apcu_fetch($key); | |
69 | } | |
70 | else { | |
71 | return apc_fetch($key); | |
72 | } | |
73 | } | |
74 | ||
75 | return null; | |
76 | } | |
77 | ||
78 | /** | |
79 | * store a cache item | |
80 | * | |
81 | * @param string $key | |
82 | * @param string $var | |
83 | * @param integer $ttl <optional> | |
84 | * @return boolean | |
85 | */ | |
86 | public function store ($key, $var, $ttl = 0) { | |
87 | $this->delete($key); // remove cache entry if allready exists | |
88 | ||
89 | if ($this->apcu) { | |
90 | apcu_store($key, $var, $ttl); | |
91 | } | |
92 | else { | |
93 | apc_store($key, $var, $ttl); | |
94 | } | |
95 | } | |
96 | ||
97 | /** | |
98 | * Checks if APC/APCu key exists | |
99 | * | |
100 | * @param string $key | |
101 | * @return boolean | |
102 | */ | |
103 | protected function exists ($key) { | |
104 | $cacheItems = array(); | |
105 | foreach ($this->cache_info() as $item) { | |
106 | $cacheItems[] = $item['info']; | |
107 | } | |
108 | return in_array($key, $cacheItems); | |
109 | } | |
110 | ||
111 | /** | |
112 | * get cache lifetime | |
113 | * | |
114 | * @param string $key | |
115 | * @return array | |
116 | */ | |
117 | protected function getCacheTime ($key) { | |
118 | $cacheItems = array(); | |
119 | foreach ($this->cache_info() as $item) { | |
120 | if ($item['info'] == $key) { | |
121 | return array( | |
122 | "ttl" => $item['ttl'], | |
123 | "mtime" => $item['mtime'] | |
124 | ); | |
125 | } | |
126 | } | |
127 | } | |
128 | ||
129 | /** | |
130 | * get cache items | |
131 | * | |
132 | * @param string $cache_type <optional> | |
133 | * @return array | |
134 | */ | |
135 | public function cache_info ($cache_type = "") { | |
136 | $info = array(); | |
137 | ||
138 | if ($this->apcu) { | |
139 | $apcinfo = apcu_cache_info($cache_type); | |
140 | } | |
141 | else { | |
142 | // APC need cache_type = 'user' | |
143 | if ($cache_type == "") $cache_type = "user"; | |
144 | ||
145 | $apcinfo = apc_cache_info($cache_type); | |
146 | } | |
147 | ||
148 | if (isset($apcinfo['cache_list'])) { | |
149 | $cacheList = $apcinfo['cache_list']; | |
150 | ||
151 | usort($cacheList, array($this, "usort")); | |
152 | ||
153 | foreach ($cacheList as $cache) { | |
154 | // make APCu output compatible with APC | |
155 | ||
156 | if (isset($cache['key'])) { | |
157 | $cache['info'] = $cache['key']; | |
158 | unset($cache['key']); | |
159 | } | |
160 | ||
161 | if (!isset($cache['type'])) { | |
162 | $cache['type'] = 'user'; | |
163 | } | |
164 | ||
165 | if (isset($cache['nhits'])) { | |
166 | $cache['num_hits'] = $cache['nhits']; | |
167 | unset($cache['nhits']); | |
168 | } | |
169 | ||
170 | if (isset($cache['ctime'])) { | |
171 | $cache['creation_time'] = $cache['ctime']; | |
172 | unset($cache['ctime']); | |
173 | } | |
174 | ||
175 | if (isset($cache['dtime'])) { | |
176 | $cache['deletion_time'] = $cache['dtime']; | |
177 | unset($cache['dtime']); | |
178 | } | |
179 | ||
180 | if (isset($cache['atime'])) { | |
181 | $cache['access_time'] = $cache['atime']; | |
182 | unset($cache['atime']); | |
183 | } | |
184 | ||
a37c89e6 S |
185 | if (isset($cache['modification_time'])) { |
186 | $cache['mtime'] = $cache['modification_time']; | |
187 | unset($cache['modification_time']); | |
188 | } | |
189 | ||
93a50078 S |
190 | $info[] = $cache; |
191 | } | |
192 | } | |
193 | ||
194 | return $info; | |
195 | } | |
196 | ||
197 | /** | |
198 | * sort the given data | |
199 | * | |
200 | * @param array $a | |
201 | * @param array $b | |
202 | * @return array | |
203 | */ | |
204 | protected function usort ($a, $b) { | |
205 | if (isset($a['key']) && isset($b['key'])) { | |
206 | return $a['key'] > $b['key']; | |
207 | } | |
208 | else if (isset($a['info']) && isset($b['info'])) { | |
209 | return $a['info'] > $b['info']; | |
210 | } | |
211 | } | |
212 | } |