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<?php |
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|
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/** |
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* APCu drop-in, based on https://wordpress.org/plugins/apcu/ |
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*/ |
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|
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if ( ! function_exists( 'apcu_add' ) ) { |
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return; |
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} |
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|
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if ( ! defined( 'WP_CACHE_KEY_SALT' ) ) { |
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define( 'WP_CACHE_KEY_SALT', DB_NAME ); |
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} |
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|
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|
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function wp_cache_add( $key, $data, $group = '', $expire = 0 ) { |
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global $wp_object_cache; |
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|
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return $wp_object_cache->add( $key, $data, $group, (int) $expire ); |
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} |
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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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function wp_cache_decr( $key, $offset = 1, $group = '' ) { |
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global $wp_object_cache; |
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|
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return $wp_object_cache->decr( $key, $offset, $group ); |
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} |
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|
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function wp_cache_delete( $key, $group = '' ) { |
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global $wp_object_cache; |
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|
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return $wp_object_cache->delete( $key, $group ); |
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} |
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|
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function wp_cache_flush() { |
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global $wp_object_cache; |
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|
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return $wp_object_cache->flush(); |
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} |
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|
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function wp_cache_get( $key, $group = '', $force = false, &$found = null ) { |
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global $wp_object_cache; |
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|
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return $wp_object_cache->get( $key, $group, $force, $found ); |
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} |
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|
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function wp_cache_incr( $key, $offset = 1, $group = '' ) { |
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global $wp_object_cache; |
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|
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return $wp_object_cache->incr( $key, $offset, $group ); |
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} |
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|
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function wp_cache_init() { |
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$GLOBALS['wp_object_cache'] = new APCu_Object_Cache(); |
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} |
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|
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function wp_cache_replace( $key, $data, $group = '', $expire = 0 ) { |
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global $wp_object_cache; |
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|
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return $wp_object_cache->replace( $key, $data, $group, (int) $expire ); |
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} |
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|
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function wp_cache_set( $key, $data, $group = '', $expire = 0 ) { |
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global $wp_object_cache; |
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|
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return $wp_object_cache->set( $key, $data, $group, (int) $expire ); |
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} |
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|
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function wp_cache_switch_to_blog( $blog_id ) { |
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global $wp_object_cache; |
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|
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$wp_object_cache->switch_to_blog( $blog_id ); |
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} |
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|
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function wp_cache_add_global_groups( $groups ) { |
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global $wp_object_cache; |
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|
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$wp_object_cache->add_global_groups( $groups ); |
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} |
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|
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function wp_cache_add_non_persistent_groups( $groups ) { |
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global $wp_object_cache; |
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|
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$wp_object_cache->wp_cache_add_non_persistent_groups( $groups ); |
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} |
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|
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function wp_cache_reset() { |
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global $wp_object_cache; |
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|
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$wp_object_cache->reset(); |
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} |
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|
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|
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class APCu_Object_Cache { |
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|
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private $prefix = ''; |
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private $local_cache = array(); |
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private $global_groups = array(); |
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private $non_persistent_groups = array(); |
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private $multisite = false; |
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private $blog_prefix = ''; |
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|
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|
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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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* @access public |
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* @var int |
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*/ |
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public $cache_hits = 0; |
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|
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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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* @access public |
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* @var int |
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*/ |
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public $cache_misses = 0; |
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|
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public function __construct() { |
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global $table_prefix; |
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|
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$this->multisite = is_multisite(); |
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$this->blog_prefix = $this->multisite ? get_current_blog_id() . ':' : ''; |
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$this->prefix = DB_HOST . '.' . DB_NAME . '.' . $table_prefix; |
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} |
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|
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private function get_group( $group ) { |
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return empty( $group ) ? 'default' : $group; |
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} |
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|
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private function get_key( $group, $key ) { |
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|
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if ( $this->multisite && ! isset( $this->global_groups[ $group ] ) ) { |
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$prefix = $this->prefix . '.' . $group . '.' . $this->blog_prefix . ':' . $key; |
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} else { |
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$prefix = $this->prefix . '.' . $group . '.' . $key; |
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} |
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|
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return preg_replace( '/\s+/', '', WP_CACHE_KEY_SALT . "$prefix" ); |
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} |
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|
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public function add( $key, $data, $group = 'default', $expire = 0 ) { |
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$group = $this->get_group( $group ); |
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$key = $this->get_key( $group, $key ); |
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|
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if ( function_exists( 'wp_suspend_cache_addition' ) && wp_suspend_cache_addition() ) { |
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return false; |
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} |
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if ( isset( $this->local_cache[ $group ][ $key ] ) ) { |
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return false; |
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} |
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// FIXME: Somehow apcu_add does not return false if key already exists |
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if ( ! isset( $this->non_persistent_groups[ $group ] ) && apcu_exists( $key ) ) { |
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return false; |
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} |
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|
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if ( is_object( $data ) ) { |
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$this->local_cache[ $group ][ $key ] = clone $data; |
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} else { |
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$this->local_cache[ $group ][ $key ] = $data; |
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} |
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|
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if ( ! isset( $this->non_persistent_groups[ $group ] ) ) { |
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return apcu_add( $key, $data, (int) $expire ); |
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} |
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|
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return true; |
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} |
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|
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public function add_global_groups( $groups ) { |
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if ( is_array( $groups ) ) { |
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foreach ( $groups as $group ) { |
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$this->global_groups[ $group ] = true; |
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} |
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} else { |
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$this->global_groups[ $groups ] = true; |
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} |
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} |
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|
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public function wp_cache_add_non_persistent_groups( $groups ) { |
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if ( is_array( $groups ) ) { |
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foreach ( $groups as $group ) { |
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$this->non_persistent_groups[ $group ] = true; |
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} |
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} else { |
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$this->non_persistent_groups[ $groups ] = true; |
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} |
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} |
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|
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public function decr( $key, $offset = 1, $group = 'default' ) { |
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if ( $offset < 0 ) { |
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return $this->incr( $key, abs( $offset ), $group ); |
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} |
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|
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$group = $this->get_group( $group ); |
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$key = $this->get_key( $group, $key ); |
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|
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if ( isset( $this->local_cache[ $group ][ $key ] ) && $this->local_cache[ $group ][ $key ] - $offset >= 0 ) { |
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$this->local_cache[ $group ][ $key ] -= $offset; |
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} else { |
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$this->local_cache[ $group ][ $key ] = 0; |
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} |
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|
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if ( isset( $this->non_persistent_groups[ $group ] ) ) { |
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return $this->local_cache[ $group ][ $key ]; |
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} else { |
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$value = apcu_dec( $key, $offset ); |
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if ( $value < 0 ) { |
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apcu_store( $key, 0 ); |
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|
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return 0; |
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} |
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|
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return $value; |
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} |
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} |
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|
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public function delete( $key, $group = 'default', $force = false ) { |
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$group = $this->get_group( $group ); |
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$key = $this->get_key( $group, $key ); |
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|
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unset( $this->local_cache[ $group ][ $key ] ); |
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if ( ! isset( $this->non_persistent_groups[ $group ] ) ) { |
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return apcu_delete( $key ); |
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} |
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|
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return true; |
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} |
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|
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public function flush() { |
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$this->local_cache = array(); |
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// TODO: only clear our own entries |
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apcu_clear_cache(); |
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|
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return true; |
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} |
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|
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public function get( $key, $group = 'default', $force = false, &$found = null ) { |
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$group = $this->get_group( $group ); |
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$key = $this->get_key( $group, $key ); |
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|
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if ( ! $force && isset( $this->local_cache[ $group ][ $key ] ) ) { |
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$found = true; |
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$this->cache_hits += 1; |
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if ( is_object( $this->local_cache[ $group ][ $key ] ) ) { |
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return clone $this->local_cache[ $group ][ $key ]; |
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} else { |
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return $this->local_cache[ $group ][ $key ]; |
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} |
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} elseif ( isset( $this->non_persistent_groups[ $group ] ) ) { |
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$found = false; |
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$this->cache_misses += 1; |
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|
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return false; |
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} else { |
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$value = apcu_fetch( $key, $found ); |
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if ( $found ) { |
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if ( $force ) { |
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$this->local_cache[ $group ][ $key ] = $value; |
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} |
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$this->cache_hits += 1; |
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|
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return $value; |
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} else { |
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$this->cache_misses += 1; |
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|
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return false; |
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} |
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} |
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} |
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|
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public function incr( $key, $offset = 1, $group = 'default' ) { |
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if ( $offset < 0 ) { |
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return $this->decr( $key, abs( $offset ), $group ); |
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} |
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|
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$group = $this->get_group( $group ); |
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$key = $this->get_key( $group, $key ); |
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|
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if ( isset( $this->local_cache[ $group ][ $key ] ) && $this->local_cache[ $group ][ $key ] + $offset >= 0 ) { |
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$this->local_cache[ $group ][ $key ] += $offset; |
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} else { |
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$this->local_cache[ $group ][ $key ] = 0; |
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} |
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|
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if ( isset( $this->non_persistent_groups[ $group ] ) ) { |
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return $this->local_cache[ $group ][ $key ]; |
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} else { |
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$value = apcu_inc( $key, $offset ); |
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if ( $value < 0 ) { |
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apcu_store( $key, 0 ); |
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|
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return 0; |
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} |
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|
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return $value; |
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} |
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} |
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|
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public function replace( $key, $data, $group = 'default', $expire = 0 ) { |
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$group = $this->get_group( $group ); |
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$key = $this->get_key( $group, $key ); |
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|
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if ( isset( $this->non_persistent_groups[ $group ] ) ) { |
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if ( ! isset( $this->local_cache[ $group ][ $key ] ) ) { |
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return false; |
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} |
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} else { |
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if ( ! isset( $this->local_cache[ $group ][ $key ] ) && ! apcu_exists( $key ) ) { |
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return false; |
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} |
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apcu_store( $key, $data, (int) $expire ); |
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} |
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|
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if ( is_object( $data ) ) { |
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$this->local_cache[ $group ][ $key ] = clone $data; |
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} else { |
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$this->local_cache[ $group ][ $key ] = $data; |
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} |
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|
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return true; |
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} |
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|
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public function reset() { |
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// This function is deprecated as of WordPress 3.5 |
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// Be safe and flush the cache if this function is still used |
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$this->flush(); |
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} |
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|
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public function set( $key, $data, $group = 'default', $expire = 0 ) { |
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$group = $this->get_group( $group ); |
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$key = $this->get_key( $group, $key ); |
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|
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if ( is_object( $data ) ) { |
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$this->local_cache[ $group ][ $key ] = clone $data; |
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} else { |
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$this->local_cache[ $group ][ $key ] = $data; |
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} |
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|
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if ( ! isset( $this->non_persistent_groups[ $group ] ) ) { |
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return apcu_store( $key, $data, (int) $expire ); |
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} |
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|
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return true; |
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} |
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|
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public function stats() { |
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// Only implemented because the default cache class provides this. |
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// This method is never called. |
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echo ''; |
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} |
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|
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public function switch_to_blog( $blog_id ) { |
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$this->blog_prefix = $this->multisite ? $blog_id . ':' : ''; |
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} |
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|
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} |
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|
