315 lines
8.7 KiB
PHP
315 lines
8.7 KiB
PHP
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<?php
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/**
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* Core Cache implements an object cache.
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*
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* The Object Cache stores all of the cache data to memory only for the duration of the request.
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*
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* @package Core\Cache
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*/
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/**
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* Core class that implements an object cache.
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*
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* The Object Cache is used to save on trips to the database. The
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* Object Cache stores all of the cache data to memory and makes the cache
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* contents available by using a key, which is used to name and later retrieve
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* the cache contents.
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*
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* @private
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*
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* @package ET\Core\Cache
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*/
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final class ET_Core_Cache {
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/**
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* Cached data.
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*
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* @since 1.0.0
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*
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* @type array
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*/
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private static $cache = array();
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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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* @since 1.0.0
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*
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* @param int|string $key 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 Optional. Where to group the cache contents. Default 'default'.
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* @return bool False if cache key and group already exist, true on success
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*/
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public static function add( $key, $data, $group = 'default' ) {
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if ( empty( $group ) ) {
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$group = 'default';
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}
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if ( self::_exists( $key, $group ) ) {
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return false;
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}
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return self::set( $key, $data, $group );
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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 by the
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* $key. This allows for duplicate ids in unique groups.
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*
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* @since 1.0.0
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*
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* @param int|string $key 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 Optional. Where to group the cache contents. Default 'default'.
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* @param int $expire Not Used.
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* @return true Always returns true.
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*/
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public static function set( $key, $data, $group = 'default' ) {
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if ( empty( $group ) ) {
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$group = 'default';
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}
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if ( is_object( $data ) ) {
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$data = clone $data;
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}
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self::$cache[ $group ][ $key ] = $data;
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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 by the
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* key in the cache group. If the cache is hit (success) then the contents
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* are returned.
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*
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* @since 1.0.0
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*
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* @param int|string $key What the contents in the cache are called.
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* @param string $group Optional. Where the cache contents are grouped. Default 'default'.
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* @return false|mixed False on failure to retrieve contents or the cache contents on success.
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*/
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public static function get( $key, $group = 'default' ) {
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if ( empty( $group ) ) {
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$group = 'default';
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}
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if ( self::_exists( $key, $group ) ) {
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if ( is_object( self::$cache[ $group ][ $key ] ) ) {
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return clone self::$cache[ $group ][ $key ];
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} else {
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return self::$cache[ $group ][ $key ];
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}
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}
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return false;
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}
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/**
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* Retrieves the cache contents for entire group, if it exists.
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*
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* If the cache is hit (success) then the contents of the group
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* are returned.
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*
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* @since 1.0.0
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*
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* @param string $group Where the cache contents are grouped.
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* @return false|mixed False on failure to retrieve contents or the cache contents on success.
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*/
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public static function get_group( $group ) {
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if ( isset( self::$cache[ $group ] ) ) {
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return self::$cache[ $group ];
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}
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return false;
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}
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/**
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* Check the cache contents, if given key and (optional) group exists.
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*
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* @since 1.0.0
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*
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* @param int|string $key What the contents in the cache are called.
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* @param string $group Optional. Where the cache contents are grouped. Default 'default'.
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* @return bool False on failure to retrieve contents or True on success.
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*/
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public static function has( $key, $group = 'default' ) {
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if ( empty( $group ) ) {
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$group = 'default';
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}
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return self::_exists( $key, $group );
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}
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/**
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* Removes the contents of the cache key in the group.
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*
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* If the cache key does not exist in the group, then nothing will happen.
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*
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* @since 1.0.0
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*
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* @param int|string $key What the contents in the cache are called.
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* @param string $group Optional. Where the cache contents are grouped. Default 'default'.
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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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public static function delete( $key, $group = 'default' ) {
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if ( empty( $group ) ) {
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$group = 'default';
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}
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if ( ! self::_exists( $key, $group ) ) {
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return false;
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}
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unset( self::$cache[ $group ][ $key ] );
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return true;
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}
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/**
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* Clears the object cache of all data.
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*
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* @since 1.0.0
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*
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* @return true Always returns true.
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*/
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public static function flush() {
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self::$cache = array();
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return true;
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}
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/**
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* Serves as a utility function to determine whether a key exists in the cache.
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*
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* @since 1.0.0
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* @private
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*
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* @param int|string $key Cache key to check for existence.
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* @param string $group Cache group for the key existence check.
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* @return bool Whether the key exists in the cache for the given group.
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*/
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private static function _exists( $key, $group ) {
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return isset( self::$cache[ $group ] ) && isset( self::$cache[ $group ][ $key ] );
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}
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}
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if ( ! function_exists( 'et_core_cache_add' ) ) :
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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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* @since 1.0.0
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*
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* @param int|string $key 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 Optional. Where to group the cache contents. Default 'default'.
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* @return bool False if cache key and group already exist, true on success
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*/
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function et_core_cache_add( $key, $data, $group = '' ) {
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return ET_Core_Cache::add( $key, $data, $group );
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}
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endif;
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if ( ! function_exists( 'et_core_cache_set' ) ) :
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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 by the
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* $key. This allows for duplicate ids in unique groups.
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*
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* @since 1.0.0
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*
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* @param int|string $key 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 Optional. Where to group the cache contents. Default 'default'.
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* @param int $expire Not Used.
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* @return true Always returns true.
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*/
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function et_core_cache_set( $key, $data, $group = '' ) {
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return ET_Core_Cache::set( $key, $data, $group );
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}
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endif;
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if ( ! function_exists( 'et_core_cache_get' ) ) :
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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 by the
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* key in the cache group. If the cache is hit (success) then the contents
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* are returned.
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*
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* @since 1.0.0
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*
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* @param int|string $key What the contents in the cache are called.
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* @param string $group Optional. Where the cache contents are grouped. Default 'default'.
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* @return false|mixed False on failure to retrieve contents or the cache contents on success.
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*/
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function et_core_cache_get( $key, $group = '' ) {
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return ET_Core_Cache::get( $key, $group );
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}
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endif;
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if ( ! function_exists( 'et_core_cache_get_group' ) ) :
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/**
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* Retrieves the cache contents for entire group, if it exists.
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*
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* If the cache is hit (success) then the contents of the group
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* are returned.
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*
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* @since 1.0.0
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*
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* @param string $group Where the cache contents are grouped.
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* @return false|mixed False on failure to retrieve contents or the cache contents on success.
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*/
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function et_core_cache_get_group( $group ) {
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return ET_Core_Cache::get_group( $group );
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}
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endif;
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if ( ! function_exists( 'et_core_cache_has' ) ) :
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/**
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* Check the cache contents, if given key and (optional) group exists.
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*
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* @since 1.0.0
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*
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* @param int|string $key What the contents in the cache are called.
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* @param string $group Optional. Where the cache contents are grouped. Default 'default'.
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* @return bool False on failure to retrieve contents or True on success.
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*/
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function et_core_cache_has( $key, $group = '' ) {
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return ET_Core_Cache::has( $key, $group );
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}
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endif;
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if ( ! function_exists( 'et_core_cache_delete' ) ) :
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/**
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* Removes the contents of the cache key in the group.
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*
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* If the cache key does not exist in the group, then nothing will happen.
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*
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* @since 1.0.0
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*
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* @param int|string $key What the contents in the cache are called.
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* @param string $group Optional. Where the cache contents are grouped. Default 'default'.
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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 et_core_cache_delete( $key, $group = '' ) {
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return ET_Core_Cache::delete( $key, $group );
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}
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endif;
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if ( ! function_exists( 'et_core_cache_flush' ) ) :
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/**
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* Clears the object cache of all data.
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*
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* @since 1.0.0
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* @return true Always returns true.
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*/
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function et_core_cache_flush() {
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return ET_Core_Cache::flush();
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}
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endif;
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