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

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

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