wp-optimize / includes / class-wp-optimize-transients-cache.php

class-wp-optimize-transients-cache.php in WP-Optimize – Cache, Compress images, Minify & Clean database to boost page speed & performance 3.2.21, at includes/class-wp-optimize-transients-cache.php

163 lines 3.4 KB

Raw Download Zip

1	<?php
2
3	if (!defined('WPO_VERSION')) die('No direct access allowed');
4
5	/**
6	* Class WP_Optimize_Transients_Cache
7	*/
8	class WP_Optimize_Transients_Cache {
9
10	private $_cache = array();
11
12	private $_expiration = array();
13
14	private $_keep_free_mem = false;
15
16	/**
17	* WP_Optimize_Transients_Cache constructor.
18	*/
19	public function __construct() {
20	}
21
22	/**
23	* Return instance of WP_Optimize_Transients_Cache.
24	*
25	* @return WP_Optimize_Transients_Cache
26	*/
27	public static function get_instance() {
28	static $instance;
29	if (null === $instance) {
30	$instance = new self();
31	}
32	return $instance;
33
34	}
35
36	/**
37	* Save $value to memory or to database depends on free memory.
38	*
39	* @param string $key
40	* @param mixed $value
41	* @param int $expiration
42	*/
43	public function set($key, &$value, $expiration = 0) {
44	$keep_free_mem = $this->_keep_free_mem ? $this->_keep_free_mem : 16 * 1048576;
45
46	$used_memory = memory_get_usage();
47	$free_memory = WP_Optimize()->get_free_memory();
48	$released_memory = 0;
49
50	$cache_keys = array_keys($this->_cache);
51
52	// release memory while we need.
53	while ($keep_free_mem > $free_memory + $released_memory && !empty($cache_keys)) {
54	$this->flush_value(array_shift($cache_keys));
55	$released_memory = $used_memory - memory_get_usage();
56	}
57
58	// if we have enough of free memory then save to memory.
59	if (WP_Optimize()->get_free_memory() > $keep_free_mem) {
60	$this->_cache[$key] = $value;
61	$this->_expiration[$key] = $expiration;
62	} else {
63	if (isset($this->_cache[$key])) {
64	unset($this->_cache[$key]);
65	}
66
67	if (isset($this->_expiration[$key])) {
68	unset($this->_expiration[$key]);
69	}
70
71	$this->set_transient($key, $value, $expiration);
72	}
73	}
74
75	/**
76	* Return value from cache by $key.
77	*
78	* @param string $key
79	* @return mixed
80	*/
81	public function get($key) {
82	if (array_key_exists($key, $this->_cache)) return $this->_cache[$key];
83
84	return $this->get_transient($key);
85	}
86
87	/**
88	* Delete value from cache.
89	*
90	* @param string $key
91	*/
92	public function delete($key) {
93	if (array_key_exists($key, $this->_cache)) {
94	unset($this->_cache[$key], $this->_expiration[$key]);
95	}
96
97	$this->delete_transient($key);
98	}
99
100	/**
101	* Set transient.
102	*
103	* @param int $key
104	* @param mixed $value
105	* @param int $expiration
106	*/
107	public function set_transient($key, $value, $expiration = 0) {
108	if (WP_Optimize()->is_multisite_mode()) {
109	set_site_transient($key, $value, $expiration);
110	} else {
111	set_transient($key, $value, $expiration);
112	}
113	}
114
115	/**
116	* Get transient.
117	*
118	* @param string $key
119	* @return mixed
120	*/
121	public function get_transient($key) {
122	if (WP_Optimize()->is_multisite_mode()) {
123	$value = get_site_transient($key);
124	} else {
125	$value = get_transient($key);
126	}
127
128	return $value;
129	}
130
131	/**
132	* Delete transient.
133	*
134	* @param string $key
135	*/
136	public function delete_transient($key) {
137	if (WP_Optimize()->is_multisite_mode()) {
138	delete_site_transient($key);
139	} else {
140	delete_transient($key);
141	}
142	}
143
144	/**
145	* Save value to database and remove from $_cache array.
146	*
147	* @param string $key
148	*/
149	public function flush_value($key) {
150	$this->set_transient($key, $this->_cache[$key], $this->_expiration[$key]);
151	unset($this->_cache[$key], $this->_expiration[$key]);
152	}
153
154	/**
155	* Save all _cache values to database.
156	*/
157	public function flush() {
158	foreach (array_keys($this->_cache) as $key) {
159	$this->flush_value($key);
160	}
161	}
162	}
163