mirror of
https://github.com/WordPress/WordPress.git
synced 2024-11-04 09:49:37 +01:00
8263948a96
git-svn-id: http://svn.automattic.com/wordpress/trunk@6711 1a063a9b-81f0-0310-95a4-ce76da25c4cd
422 lines
11 KiB
PHP
422 lines
11 KiB
PHP
<?php
|
|
/**
|
|
* Object Cache API
|
|
*
|
|
* @package WordPress
|
|
* @subpackage Cache
|
|
*/
|
|
|
|
/**
|
|
* wp_cache_add() - Adds data to the cache, if the cache key doesn't aleady exist
|
|
*
|
|
* @since 2.0
|
|
* @uses $wp_object_cache Object Cache Class
|
|
* @see WP_Object_Cache::add()
|
|
*
|
|
* @param int|string $key The cache ID to use for retrieval later
|
|
* @param mixed $data The data to add to the cache store
|
|
* @param string $flag The group to add the cache to
|
|
* @param int $expire When the cache data should be expired
|
|
* @return unknown
|
|
*/
|
|
function wp_cache_add($key, $data, $flag = '', $expire = 0) {
|
|
global $wp_object_cache;
|
|
|
|
return $wp_object_cache->add($key, $data, $flag, $expire);
|
|
}
|
|
|
|
/**
|
|
* wp_cache_close() - Closes the cache
|
|
*
|
|
* This function has ceased to do anything since WordPress 2.5.
|
|
* The functionality was removed along with the rest of the
|
|
* persistant cache.
|
|
*
|
|
* @since 2.0
|
|
*
|
|
* @return bool Always returns True
|
|
*/
|
|
function wp_cache_close() {
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* wp_cache_delete() - Removes the cache contents matching ID and flag
|
|
*
|
|
* @since 2.0
|
|
* @uses $wp_object_cache Object Cache Class
|
|
* @see WP_Object_Cache::delete()
|
|
*
|
|
* @param int|string $id What the contents in the cache are called
|
|
* @param string $flag Where the cache contents are grouped
|
|
* @return bool True on successful removal, false on failure
|
|
*/
|
|
function wp_cache_delete($id, $flag = '') {
|
|
global $wp_object_cache;
|
|
|
|
return $wp_object_cache->delete($id, $flag);
|
|
}
|
|
|
|
/**
|
|
* wp_cache_flush() - Removes all cache items
|
|
*
|
|
* @since 2.0
|
|
* @uses $wp_object_cache Object Cache Class
|
|
* @see WP_Object_Cache::flush()
|
|
*
|
|
* @return bool Always returns true
|
|
*/
|
|
function wp_cache_flush() {
|
|
global $wp_object_cache;
|
|
|
|
return $wp_object_cache->flush();
|
|
}
|
|
|
|
/**
|
|
* wp_cache_get() - Retrieves the cache contents from the cache by ID and flag
|
|
*
|
|
* @since 2.0
|
|
* @uses $wp_object_cache Object Cache Class
|
|
* @see WP_Object_Cache::get()
|
|
*
|
|
* @param int|string $id What the contents in the cache are called
|
|
* @param string $flag Where the cache contents are grouped
|
|
* @return bool|mixed False on failure to retrieve contents or the cache contents on success
|
|
*/
|
|
function wp_cache_get($id, $flag = '') {
|
|
global $wp_object_cache;
|
|
|
|
return $wp_object_cache->get($id, $flag);
|
|
}
|
|
|
|
/**
|
|
* wp_cache_init() - Sets up Object Cache Global and assigns it
|
|
*
|
|
* @since 2.0
|
|
* @global WP_Object_Cache $wp_object_cache WordPress Object Cache
|
|
*/
|
|
function wp_cache_init() {
|
|
$GLOBALS['wp_object_cache'] =& new WP_Object_Cache();
|
|
}
|
|
|
|
/**
|
|
* wp_cache_replace() - Replaces the contents of the cache with new data
|
|
*
|
|
* @since 2.0
|
|
* @uses $wp_object_cache Object Cache Class
|
|
* @see WP_Object_Cache::replace()
|
|
*
|
|
* @param int|string $id What to call the contents in the cache
|
|
* @param mixed $data The contents to store in the cache
|
|
* @param string $flag Where to group the cache contents
|
|
* @param int $expire When to expire the cache contents
|
|
* @return bool False if cache ID and group already exists, true on success
|
|
*/
|
|
function wp_cache_replace($key, $data, $flag = '', $expire = 0) {
|
|
global $wp_object_cache;
|
|
|
|
return $wp_object_cache->replace($key, $data, $flag, $expire);
|
|
}
|
|
|
|
/**
|
|
* wp_cache_set() - Saves the data to the cache
|
|
*
|
|
* @since 2.0
|
|
* @uses $wp_object_cache Object Cache Class
|
|
* @see WP_Object_Cache::set()
|
|
*
|
|
* @param int|string $id What to call the contents in the cache
|
|
* @param mixed $data The contents to store in the cache
|
|
* @param string $flag Where to group the cache contents
|
|
* @param int $expire When to expire the cache contents
|
|
* @return bool False if cache ID and group already exists, true on success
|
|
*/
|
|
function wp_cache_set($key, $data, $flag = '', $expire = 0) {
|
|
global $wp_object_cache;
|
|
|
|
return $wp_object_cache->set($key, $data, $flag, $expire);
|
|
}
|
|
|
|
/**
|
|
* WordPress Object Cache
|
|
*
|
|
* The WordPress Object Cache is used to save on trips to the database.
|
|
* The Object Cache stores all of the cache data to memory and makes the
|
|
* cache contents available by using a key, which is used to name and
|
|
* later retrieve the cache contents.
|
|
*
|
|
* The Object Cache can be replaced by other caching mechanisms by placing
|
|
* files in the wp-content folder which is looked at in wp-settings. If
|
|
* that file exists, then this file will not be included.
|
|
*
|
|
* @package WordPress
|
|
* @subpackage Cache
|
|
* @since 2.0
|
|
*/
|
|
class WP_Object_Cache {
|
|
|
|
/**
|
|
* Holds the cached objects
|
|
*
|
|
* @var array
|
|
* @access private
|
|
* @since 2.0
|
|
*/
|
|
var $cache = array ();
|
|
|
|
/**
|
|
* Cache objects that do not exist in the cache
|
|
*
|
|
* @var array
|
|
* @access private
|
|
* @since 2.0
|
|
*/
|
|
var $non_existant_objects = array ();
|
|
|
|
/**
|
|
* Object caches that are global
|
|
*
|
|
* @var array
|
|
* @access private
|
|
* @since 2.0
|
|
*/
|
|
var $global_groups = array ('users', 'userlogins', 'usermeta');
|
|
|
|
/**
|
|
* The amount of times the cache data was already stored in the cache.
|
|
*
|
|
* @since 2.5
|
|
* @access private
|
|
* @var int
|
|
*/
|
|
var $cache_hits = 0;
|
|
|
|
/**
|
|
* Amount of times the cache did not have the request in cache
|
|
*
|
|
* @var int
|
|
* @access public
|
|
* @since 2.0
|
|
*/
|
|
var $cache_misses = 0;
|
|
|
|
/**
|
|
* Adds data to the cache if it doesn't already exist.
|
|
*
|
|
* @uses WP_Object_Cache::get Checks to see if the cache already has data.
|
|
* @uses WP_Object_Cache::set Sets the data after the checking the cache contents existance.
|
|
*
|
|
* @since 2.0
|
|
*
|
|
* @param int|string $id What to call the contents in the cache
|
|
* @param mixed $data The contents to store in the cache
|
|
* @param string $group Where to group the cache contents
|
|
* @param int $expire When to expire the cache contents
|
|
* @return bool False if cache ID and group already exists, true on success
|
|
*/
|
|
function add($id, $data, $group = 'default', $expire = '') {
|
|
if (empty ($group))
|
|
$group = 'default';
|
|
|
|
if (false !== $this->get($id, $group, false))
|
|
return false;
|
|
|
|
return $this->set($id, $data, $group, $expire);
|
|
}
|
|
|
|
/**
|
|
* Remove the contents of the cache ID in the group
|
|
*
|
|
* If the cache ID does not exist in the group and $force parameter
|
|
* is set to false, then nothing will happen. The $force parameter
|
|
* is set to false by default.
|
|
*
|
|
* On success the group and the id will be added to the
|
|
* $non_existant_objects property in the class.
|
|
*
|
|
* @since 2.0
|
|
*
|
|
* @param int|string $id What the contents in the cache are called
|
|
* @param string $group Where the cache contents are grouped
|
|
* @param bool $force Optional. Whether to force the unsetting of the cache ID in the group
|
|
* @return bool False if the contents weren't deleted and true on success
|
|
*/
|
|
function delete($id, $group = 'default', $force = false) {
|
|
if (empty ($group))
|
|
$group = 'default';
|
|
|
|
if (!$force && false === $this->get($id, $group, false))
|
|
return false;
|
|
|
|
unset ($this->cache[$group][$id]);
|
|
$this->non_existant_objects[$group][$id] = true;
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Clears the object cache of all data
|
|
*
|
|
* @since 2.0
|
|
*
|
|
* @return bool Always returns true
|
|
*/
|
|
function flush() {
|
|
$this->cache = array ();
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Retrieves the cache contents, if it exists
|
|
*
|
|
* The contents will be first attempted to be retrieved by searching
|
|
* by the ID in the cache group. If the cache is hit (success) then
|
|
* the contents are returned.
|
|
*
|
|
* On failure, the $non_existant_objects property is checked and if
|
|
* the cache group and ID exist in there the cache misses will not be
|
|
* incremented. If not in the nonexistant objects property, then the
|
|
* cache misses will be incremented and the cache group and ID will
|
|
* be added to the nonexistant objects.
|
|
*
|
|
* @since 2.0
|
|
*
|
|
* @param int|string $id What the contents in the cache are called
|
|
* @param string $group Where the cache contents are grouped
|
|
* @return bool|mixed False on failure to retrieve contents or the cache contents on success
|
|
*/
|
|
function get($id, $group = 'default') {
|
|
if (empty ($group))
|
|
$group = 'default';
|
|
|
|
if (isset ($this->cache[$group][$id])) {
|
|
$this->cache_hits += 1;
|
|
return $this->cache[$group][$id];
|
|
}
|
|
|
|
if ( isset ($this->non_existant_objects[$group][$id]) )
|
|
return false;
|
|
|
|
$this->non_existant_objects[$group][$id] = true;
|
|
$this->cache_misses += 1;
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Replace the contents in the cache, if contents already exist
|
|
*
|
|
* @since 2.0
|
|
* @see WP_Object_Cache::set()
|
|
*
|
|
* @param int|string $id What to call the contents in the cache
|
|
* @param mixed $data The contents to store in the cache
|
|
* @param string $group Where to group the cache contents
|
|
* @param int $expire When to expire the cache contents
|
|
* @return bool False if not exists, true if contents were replaced
|
|
*/
|
|
function replace($id, $data, $group = 'default', $expire = '') {
|
|
if (empty ($group))
|
|
$group = 'default';
|
|
|
|
if (false === $this->get($id, $group, false))
|
|
return false;
|
|
|
|
return $this->set($id, $data, $group, $expire);
|
|
}
|
|
|
|
/**
|
|
* Sets the data contents into the cache
|
|
*
|
|
* The cache contents is grouped by the $group parameter followed
|
|
* by the $id. This allows for duplicate ids in unique groups.
|
|
* Therefore, naming of the group should be used with care and
|
|
* should follow normal function naming guidelines outside of
|
|
* core WordPress usage.
|
|
*
|
|
* The $expire parameter is not used, because the cache will
|
|
* automatically expire for each time a page is accessed and PHP
|
|
* finishes. The method is more for cache plugins which use files.
|
|
*
|
|
* @since 2.0
|
|
*
|
|
* @param int|string $id What to call the contents in the cache
|
|
* @param mixed $data The contents to store in the cache
|
|
* @param string $group Where to group the cache contents
|
|
* @param int $expire Not Used
|
|
* @return bool Always returns true
|
|
*/
|
|
function set($id, $data, $group = 'default', $expire = '') {
|
|
if (empty ($group))
|
|
$group = 'default';
|
|
|
|
if (NULL === $data)
|
|
$data = '';
|
|
|
|
$this->cache[$group][$id] = $data;
|
|
|
|
if(isset($this->non_existant_objects[$group][$id]))
|
|
unset ($this->non_existant_objects[$group][$id]);
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Echos the stats of the caching.
|
|
*
|
|
* Gives the cache hits, and cache misses. Also prints every cached
|
|
* group, key and the data.
|
|
*
|
|
* @since 2.0
|
|
*/
|
|
function stats() {
|
|
echo "<p>";
|
|
echo "<strong>Cache Hits:</strong> {$this->cache_hits}<br />";
|
|
echo "<strong>Cache Misses:</strong> {$this->cache_misses}<br />";
|
|
echo "</p>";
|
|
|
|
foreach ($this->cache as $group => $cache) {
|
|
echo "<p>";
|
|
echo "<strong>Group:</strong> $group<br />";
|
|
echo "<strong>Cache:</strong>";
|
|
echo "<pre>";
|
|
print_r($cache);
|
|
echo "</pre>";
|
|
}
|
|
}
|
|
|
|
/**
|
|
* PHP4 constructor; Calls PHP 5 style constructor
|
|
*
|
|
* @since 2.0
|
|
*
|
|
* @return WP_Object_Cache
|
|
*/
|
|
function WP_Object_Cache() {
|
|
return $this->__construct();
|
|
}
|
|
|
|
/**
|
|
* Sets up object properties; PHP 5 style constructor
|
|
*
|
|
* @since 2.0.8
|
|
* @return null|WP_Object_Cache If cache is disabled, returns null.
|
|
*/
|
|
function __construct() {
|
|
register_shutdown_function(array(&$this, "__destruct")); /** @todo This should be moved to the PHP4 style constructor, PHP5 already calls __destruct() */
|
|
}
|
|
|
|
/**
|
|
* Will save the object cache before object is completely destroyed.
|
|
*
|
|
* Called upon object destruction, which should be when PHP ends.
|
|
*
|
|
* @since 2.0.8
|
|
*
|
|
* @return bool True value. Won't be used by PHP
|
|
*/
|
|
function __destruct() {
|
|
return true;
|
|
}
|
|
}
|
|
?>
|