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
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
|
<?php
/**
* Smarty Internal Plugin
*
* @package Smarty
* @subpackage Cacher
*/
/**
* Cache Handler API
*
* @package Smarty
* @subpackage Cacher
* @author Rodney Rehm
*/
abstract class Smarty_CacheResource
{
/**
* resource types provided by the core
*
* @var array
*/
protected static $sysplugins = array('file' => 'smarty_internal_cacheresource_file.php',);
/**
* populate Cached Object with meta data from Resource
*
* @param \Smarty_Template_Cached $cached cached object
* @param Smarty_Internal_Template $_template template object
*
* @return void
*/
abstract public function populate(\Smarty_Template_Cached $cached, Smarty_Internal_Template $_template);
/**
* populate Cached Object with timestamp and exists from Resource
*
* @param Smarty_Template_Cached $cached
*
* @return void
*/
abstract public function populateTimestamp(Smarty_Template_Cached $cached);
/**
* Read the cached template and process header
*
* @param Smarty_Internal_Template $_template template object
* @param Smarty_Template_Cached|null $cached cached object
* @param boolean $update flag if called because cache update
*
* @return boolean true or false if the cached content does not exist
*/
abstract public function process(
Smarty_Internal_Template $_template,
?Smarty_Template_Cached $cached = null,
$update = false
);
/**
* Write the rendered template output to cache
*
* @param Smarty_Internal_Template $_template template object
* @param string $content content to cache
*
* @return boolean success
*/
abstract public function writeCachedContent(Smarty_Internal_Template $_template, $content);
/**
* Read cached template from cache
*
* @param Smarty_Internal_Template $_template template object
*
* @return string content
*/
abstract public function readCachedContent(Smarty_Internal_Template $_template);
/**
* Return cached content
*
* @param Smarty_Internal_Template $_template template object
*
* @return null|string
*/
public function getCachedContent(Smarty_Internal_Template $_template)
{
if ($_template->cached->handler->process($_template)) {
ob_start();
$unifunc = $_template->cached->unifunc;
$unifunc($_template);
return ob_get_clean();
}
return null;
}
/**
* Empty cache
*
* @param Smarty $smarty Smarty object
* @param integer $exp_time expiration time (number of seconds, not timestamp)
*
* @return integer number of cache files deleted
*/
abstract public function clearAll(Smarty $smarty, $exp_time = null);
/**
* Empty cache for a specific template
*
* @param Smarty $smarty Smarty object
* @param string $resource_name template name
* @param string $cache_id cache id
* @param string $compile_id compile id
* @param integer $exp_time expiration time (number of seconds, not timestamp)
*
* @return integer number of cache files deleted
*/
abstract public function clear(Smarty $smarty, $resource_name, $cache_id, $compile_id, $exp_time);
/**
* @param Smarty $smarty
* @param Smarty_Template_Cached $cached
*
* @return bool|null
*/
public function locked(Smarty $smarty, Smarty_Template_Cached $cached)
{
// theoretically locking_timeout should be checked against time_limit (max_execution_time)
$start = microtime(true);
$hadLock = null;
while ($this->hasLock($smarty, $cached)) {
$hadLock = true;
if (microtime(true) - $start > $smarty->locking_timeout) {
// abort waiting for lock release
return false;
}
sleep(1);
}
return $hadLock;
}
/**
* Check is cache is locked for this template
*
* @param Smarty $smarty
* @param Smarty_Template_Cached $cached
*
* @return bool
*/
public function hasLock(Smarty $smarty, Smarty_Template_Cached $cached)
{
// check if lock exists
return false;
}
/**
* Lock cache for this template
*
* @param Smarty $smarty
* @param Smarty_Template_Cached $cached
*
* @return bool
*/
public function acquireLock(Smarty $smarty, Smarty_Template_Cached $cached)
{
// create lock
return true;
}
/**
* Unlock cache for this template
*
* @param Smarty $smarty
* @param Smarty_Template_Cached $cached
*
* @return bool
*/
public function releaseLock(Smarty $smarty, Smarty_Template_Cached $cached)
{
// release lock
return true;
}
/**
* Load Cache Resource Handler
*
* @param Smarty $smarty Smarty object
* @param string $type name of the cache resource
*
* @throws SmartyException
* @return Smarty_CacheResource Cache Resource Handler
*/
public static function load(Smarty $smarty, $type = null)
{
if (!isset($type)) {
$type = $smarty->caching_type;
}
// try smarty's cache
if (isset($smarty->_cache[ 'cacheresource_handlers' ][ $type ])) {
return $smarty->_cache[ 'cacheresource_handlers' ][ $type ];
}
// try registered resource
if (isset($smarty->registered_cache_resources[ $type ])) {
// do not cache these instances as they may vary from instance to instance
return $smarty->_cache[ 'cacheresource_handlers' ][ $type ] = $smarty->registered_cache_resources[ $type ];
}
// try sysplugins dir
if (isset(self::$sysplugins[ $type ])) {
$cache_resource_class = 'Smarty_Internal_CacheResource_' . smarty_ucfirst_ascii($type);
return $smarty->_cache[ 'cacheresource_handlers' ][ $type ] = new $cache_resource_class();
}
// try plugins dir
$cache_resource_class = 'Smarty_CacheResource_' . smarty_ucfirst_ascii($type);
if ($smarty->loadPlugin($cache_resource_class)) {
return $smarty->_cache[ 'cacheresource_handlers' ][ $type ] = new $cache_resource_class();
}
// give up
throw new SmartyException("Unable to load cache resource '{$type}'");
}
}
|
