wp-super-minify / includes / min / lib / Minify / Cache / WinCache.php

WinCache.php in WP Super Minify • Minify, Compress and Cache HTML, CSS & JavaScript trunk, at includes/min/lib/Minify/Cache/WinCache.php

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1	<?php
2	/**
3	* Class Minify_Cache_Wincache
4	* @package Minify
5	*/
6
7	/**
8	* WinCache-based cache class for Minify
9	*
10	* <code>
11	* Minify::setCache(new Minify_Cache_WinCache());
12	* </code>
13	*
14	* @package Minify
15	* @author Matthias Fax
16	**/
17	class Minify_Cache_WinCache implements Minify_CacheInterface
18	{
19	/**
20	* Create a Minify_Cache_Wincache object, to be passed to
21	* Minify::setCache().
22	*
23	* @param int $expire seconds until expiration (default = 0
24	* meaning the item will not get an expiration date)
25	*
26	* @throws Exception
27	*/
28	public function __construct($expire = 0)
29	{
30	if (!function_exists('wincache_ucache_info')) {
31	throw new Exception("WinCache for PHP is not installed to be able to use Minify_Cache_WinCache!");
32	}
33	$this->_exp = $expire;
34	}
35
36	/**
37	* Write data to cache.
38	*
39	* @param string $id cache id
40	*
41	* @param string $data
42	*
43	* @return bool success
44	*/
45	public function store($id, $data)
46	{
47	return wincache_ucache_set($id, "{$_SERVER['REQUEST_TIME']}\|{$data}", $this->_exp);
48	}
49
50	/**
51	* Get the size of a cache entry
52	*
53	* @param string $id cache id
54	*
55	* @return int size in bytes
56	*/
57	public function getSize($id)
58	{
59	if (!$this->_fetch($id)) {
60	return false;
61	}
62
63	if (function_exists('mb_strlen') && ((int) ini_get('mbstring.func_overload') & 2)) {
64	return mb_strlen($this->_data, '8bit');
65	} else {
66	return strlen($this->_data);
67	}
68	}
69
70	/**
71	* Does a valid cache entry exist?
72	*
73	* @param string $id cache id
74	*
75	* @param int $srcMtime mtime of the original source file(s)
76	*
77	* @return bool exists
78	*/
79	public function isValid($id, $srcMtime)
80	{
81	return ($this->_fetch($id) && ($this->_lm >= $srcMtime));
82	}
83
84	/**
85	* Send the cached content to output
86	*
87	* @param string $id cache id
88	*/
89	public function display($id)
90	{
91	echo $this->_fetch($id) ? $this->_data : '';
92	}
93
94	/**
95	* Fetch the cached content
96	*
97	* @param string $id cache id
98	*
99	* @return string
100	*/
101	public function fetch($id)
102	{
103	return $this->_fetch($id) ? $this->_data : '';
104	}
105
106	private $_exp = null;
107
108	// cache of most recently fetched id
109	private $_lm = null;
110	private $_data = null;
111	private $_id = null;
112
113	/**
114	* Fetch data and timestamp from WinCache, store in instance
115	*
116	* @param string $id
117	*
118	* @return bool success
119	*/
120	private function _fetch($id)
121	{
122	if ($this->_id === $id) {
123	return true;
124	}
125
126	$suc = false;
127	$ret = wincache_ucache_get($id, $suc);
128	if (!$suc) {
129	$this->_id = null;
130
131	return false;
132	}
133
134	list($this->_lm, $this->_data) = explode('\|', $ret, 2);
135	$this->_id = $id;
136
137	return true;
138	}
139	}
140