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