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

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

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1	<?php
2	/**
3	* Class Minify_Cache_Memcache
4	* @package Minify
5	*/
6
7	/**
8	* Memcache-based cache class for Minify
9	*
10	* <code>
11	* // fall back to disk caching if memcache can't connect
12	* $memcache = new Memcache;
13	* if ($memcache->connect('localhost', 11211)) {
14	* Minify::setCache(new Minify_Cache_Memcache($memcache));
15	* } else {
16	* Minify::setCache();
17	* }
18	* </code>
19	**/
20	class Minify_Cache_Memcache implements Minify_CacheInterface
21	{
22
23	/**
24	* Create a Minify_Cache_Memcache object, to be passed to
25	* Minify::setCache().
26	*
27	* @param Memcache $memcache already-connected instance
28	*
29	* @param int $expire seconds until expiration (default = 0
30	* meaning the item will not get an expiration date)
31	*/
32	public function __construct($memcache, $expire = 0)
33	{
34	$this->_mc = $memcache;
35	$this->_exp = $expire;
36	}
37
38	/**
39	* Write data to cache.
40	*
41	* @param string $id cache id
42	*
43	* @param string $data
44	*
45	* @return bool success
46	*/
47	public function store($id, $data)
48	{
49	return $this->_mc->set($id, "{$_SERVER['REQUEST_TIME']}\|{$data}", 0, $this->_exp);
50	}
51
52	/**
53	* Get the size of a cache entry
54	*
55	* @param string $id cache id
56	*
57	* @return int size in bytes
58	*/
59	public function getSize($id)
60	{
61	if (! $this->_fetch($id)) {
62	return false;
63	}
64
65	if (function_exists('mb_strlen') && ((int)ini_get('mbstring.func_overload') & 2)) {
66	return mb_strlen($this->_data, '8bit');
67	} else {
68	return strlen($this->_data);
69	}
70	}
71
72	/**
73	* Does a valid cache entry exist?
74	*
75	* @param string $id cache id
76	*
77	* @param int $srcMtime mtime of the original source file(s)
78	*
79	* @return bool exists
80	*/
81	public function isValid($id, $srcMtime)
82	{
83	return ($this->_fetch($id) && ($this->_lm >= $srcMtime));
84	}
85
86	/**
87	* Send the cached content to output
88	*
89	* @param string $id cache id
90	*/
91	public function display($id)
92	{
93	echo $this->_fetch($id) ? $this->_data : '';
94	}
95
96	/**
97	* Fetch the cached content
98	*
99	* @param string $id cache id
100	*
101	* @return string
102	*/
103	public function fetch($id)
104	{
105	return $this->_fetch($id) ? $this->_data : '';
106	}
107
108	private $_mc = null;
109	private $_exp = null;
110
111	// cache of most recently fetched id
112	private $_lm = null;
113	private $_data = null;
114	private $_id = null;
115
116	/**
117	* Fetch data and timestamp from memcache, store in instance
118	*
119	* @param string $id
120	*
121	* @return bool success
122	*/
123	private function _fetch($id)
124	{
125	if ($this->_id === $id) {
126	return true;
127	}
128
129	$ret = $this->_mc->get($id);
130	if (false === $ret) {
131	$this->_id = null;
132
133	return false;
134	}
135
136	list($this->_lm, $this->_data) = explode('\|', $ret, 2);
137	$this->_id = $id;
138
139	return true;
140	}
141	}
142