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3daf349083
Brings the changes in [47637] to the 5.4 branch. Props: nickdaugherty, batmoo, whyisjake, westi. Built from https://develop.svn.wordpress.org/branches/5.4@47642 git-svn-id: http://core.svn.wordpress.org/branches/5.4@47417 1a063a9b-81f0-0310-95a4-ce76da25c4cd
476 lines
12 KiB
PHP
476 lines
12 KiB
PHP
<?php
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/**
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* Object Cache API: WP_Object_Cache class
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*
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* @package WordPress
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* @subpackage Cache
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* @since 5.4.0
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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 WordPress 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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* The Object Cache can be replaced by other caching mechanisms by placing files
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* in the wp-content folder which is looked at in wp-settings. If that file
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* exists, then this file will not be included.
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*
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* @since 2.0.0
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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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* @since 2.0.0
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* @var array
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*/
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private $cache = array();
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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 2.5.0
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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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* Amount of times the cache did not have the request in cache.
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*
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* @since 2.0.0
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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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* List of global cache groups.
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*
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* @since 3.0.0
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* @var array
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*/
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protected $global_groups = array();
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/**
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* The blog prefix to prepend to keys in non-global groups.
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*
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* @since 3.5.0
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* @var string
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*/
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private $blog_prefix;
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/**
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* Holds the value of is_multisite().
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*
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* @since 3.5.0
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* @var bool
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*/
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private $multisite;
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/**
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* Sets up object properties; PHP 5 style constructor.
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*
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* @since 2.0.8
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*/
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public function __construct() {
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$this->multisite = is_multisite();
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$this->blog_prefix = $this->multisite ? get_current_blog_id() . ':' : '';
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}
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/**
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* Makes private properties readable for backward compatibility.
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*
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* @since 4.0.0
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*
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* @param string $name Property to get.
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* @return mixed Property.
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*/
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public function __get( $name ) {
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return $this->$name;
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}
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/**
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* Makes private properties settable for backward compatibility.
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*
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* @since 4.0.0
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*
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* @param string $name Property to set.
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* @param mixed $value Property value.
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* @return mixed Newly-set property.
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*/
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public function __set( $name, $value ) {
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return $this->$name = $value;
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}
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/**
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* Makes private properties checkable for backward compatibility.
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*
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* @since 4.0.0
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*
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* @param string $name Property to check if set.
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* @return bool Whether the property is set.
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*/
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public function __isset( $name ) {
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return isset( $this->$name );
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}
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/**
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* Makes private properties un-settable for backward compatibility.
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*
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* @since 4.0.0
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*
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* @param string $name Property to unset.
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*/
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public function __unset( $name ) {
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unset( $this->$name );
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}
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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 2.0.0
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*
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* @uses WP_Object_Cache::_exists() 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
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* contents existence.
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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 Optional. When to expire the cache contents. Default 0 (no expiration).
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* @return bool True on success, false if cache key and group already exist.
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*/
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public function add( $key, $data, $group = 'default', $expire = 0 ) {
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if ( wp_suspend_cache_addition() ) {
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return false;
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}
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if ( empty( $group ) ) {
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$group = 'default';
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}
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$id = $key;
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if ( $this->multisite && ! isset( $this->global_groups[ $group ] ) ) {
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$id = $this->blog_prefix . $key;
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}
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if ( $this->_exists( $id, $group ) ) {
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return false;
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}
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return $this->set( $key, $data, $group, (int) $expire );
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}
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/**
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* Sets the list of global cache groups.
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*
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* @since 3.0.0
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*
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* @param array $groups List of groups that are global.
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*/
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public function add_global_groups( $groups ) {
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$groups = (array) $groups;
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$groups = array_fill_keys( $groups, true );
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$this->global_groups = array_merge( $this->global_groups, $groups );
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}
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/**
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* Decrements numeric cache item's value.
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*
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* @since 3.3.0
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*
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* @param int|string $key The cache key to decrement.
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* @param int $offset Optional. The amount by which to decrement the item's value. Default 1.
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* @param string $group Optional. The group the key is in. Default 'default'.
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* @return int|false The item's new value on success, false on failure.
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*/
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public function decr( $key, $offset = 1, $group = 'default' ) {
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if ( empty( $group ) ) {
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$group = 'default';
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}
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if ( $this->multisite && ! isset( $this->global_groups[ $group ] ) ) {
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$key = $this->blog_prefix . $key;
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}
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if ( ! $this->_exists( $key, $group ) ) {
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return false;
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}
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if ( ! is_numeric( $this->cache[ $group ][ $key ] ) ) {
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$this->cache[ $group ][ $key ] = 0;
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}
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$offset = (int) $offset;
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$this->cache[ $group ][ $key ] -= $offset;
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if ( $this->cache[ $group ][ $key ] < 0 ) {
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$this->cache[ $group ][ $key ] = 0;
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}
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return $this->cache[ $group ][ $key ];
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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 2.0.0
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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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* @param bool $deprecated Optional. Unused. Default false.
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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 function delete( $key, $group = 'default', $deprecated = false ) {
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if ( empty( $group ) ) {
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$group = 'default';
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}
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if ( $this->multisite && ! isset( $this->global_groups[ $group ] ) ) {
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$key = $this->blog_prefix . $key;
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}
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if ( ! $this->_exists( $key, $group ) ) {
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return false;
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}
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unset( $this->cache[ $group ][ $key ] );
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return true;
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}
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/**
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* Clears the object cache of all data.
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*
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* @since 2.0.0
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*
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* @return true Always returns true.
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*/
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public function flush() {
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$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 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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* On failure, the number of cache misses will be incremented.
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*
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* @since 2.0.0
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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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* @param bool $force Optional. Unused. Whether to force a refetch rather than relying on the local
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* cache. Default false.
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* @param bool $found Optional. Whether the key was found in the cache (passed by reference).
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* Disambiguates a return of false, a storable value. Default null.
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* @return mixed|false The cache contents on success, false on failure to retrieve contents.
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*/
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public function get( $key, $group = 'default', $force = false, &$found = null ) {
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if ( empty( $group ) ) {
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$group = 'default';
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}
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if ( $this->multisite && ! isset( $this->global_groups[ $group ] ) ) {
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$key = $this->blog_prefix . $key;
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}
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if ( $this->_exists( $key, $group ) ) {
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$found = true;
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$this->cache_hits += 1;
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if ( is_object( $this->cache[ $group ][ $key ] ) ) {
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return clone $this->cache[ $group ][ $key ];
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} else {
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return $this->cache[ $group ][ $key ];
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}
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}
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$found = false;
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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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* Increments numeric cache item's value.
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*
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* @since 3.3.0
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*
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* @param int|string $key The cache key to increment
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* @param int $offset Optional. The amount by which to increment the item's value. Default 1.
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* @param string $group Optional. The group the key is in. Default 'default'.
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* @return int|false The item's new value on success, false on failure.
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*/
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public function incr( $key, $offset = 1, $group = 'default' ) {
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if ( empty( $group ) ) {
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$group = 'default';
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}
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if ( $this->multisite && ! isset( $this->global_groups[ $group ] ) ) {
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$key = $this->blog_prefix . $key;
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}
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if ( ! $this->_exists( $key, $group ) ) {
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return false;
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}
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if ( ! is_numeric( $this->cache[ $group ][ $key ] ) ) {
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$this->cache[ $group ][ $key ] = 0;
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}
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$offset = (int) $offset;
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$this->cache[ $group ][ $key ] += $offset;
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if ( $this->cache[ $group ][ $key ] < 0 ) {
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$this->cache[ $group ][ $key ] = 0;
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}
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return $this->cache[ $group ][ $key ];
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}
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/**
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* Replaces the contents in the cache, if contents already exist.
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*
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* @since 2.0.0
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*
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* @see WP_Object_Cache::set()
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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 Optional. When to expire the cache contents. Default 0 (no expiration).
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* @return bool False if not exists, true if contents were replaced.
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*/
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public function replace( $key, $data, $group = 'default', $expire = 0 ) {
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if ( empty( $group ) ) {
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$group = 'default';
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}
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$id = $key;
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if ( $this->multisite && ! isset( $this->global_groups[ $group ] ) ) {
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$id = $this->blog_prefix . $key;
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}
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if ( ! $this->_exists( $id, $group ) ) {
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return false;
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}
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return $this->set( $key, $data, $group, (int) $expire );
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}
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/**
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* Resets cache keys.
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*
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* @since 3.0.0
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*
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* @deprecated 3.5.0 Use switch_to_blog()
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* @see switch_to_blog()
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*/
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public function reset() {
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_deprecated_function( __FUNCTION__, '3.5.0', 'switch_to_blog()' );
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// Clear out non-global caches since the blog ID has changed.
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foreach ( array_keys( $this->cache ) as $group ) {
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if ( ! isset( $this->global_groups[ $group ] ) ) {
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unset( $this->cache[ $group ] );
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}
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}
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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 are grouped by the $group parameter followed by the
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* $key. This allows for duplicate ids in unique groups. Therefore, naming of
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* the group should be used with care and should follow normal function
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* naming guidelines outside of core WordPress usage.
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*
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* The $expire parameter is not used, because the cache will automatically
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* expire for each time a page is accessed and PHP finishes. The method is
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* more for cache plugins which use files.
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*
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* @since 2.0.0
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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 function set( $key, $data, $group = 'default', $expire = 0 ) {
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if ( empty( $group ) ) {
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$group = 'default';
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}
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if ( $this->multisite && ! isset( $this->global_groups[ $group ] ) ) {
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$key = $this->blog_prefix . $key;
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}
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if ( is_object( $data ) ) {
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$data = clone $data;
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}
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$this->cache[ $group ][ $key ] = $data;
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return true;
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}
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/**
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* Echoes the stats of the caching.
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*
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* Gives the cache hits, and cache misses. Also prints every cached group,
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* key and the data.
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*
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* @since 2.0.0
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*/
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public function stats() {
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echo '<p>';
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echo "<strong>Cache Hits:</strong> {$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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echo '<ul>';
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foreach ( $this->cache as $group => $cache ) {
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echo '<li><strong>Group:</strong> ' . esc_html( $group ) . ' - ( ' . number_format( strlen( serialize( $cache ) ) / KB_IN_BYTES, 2 ) . 'k )</li>';
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}
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echo '</ul>';
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}
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/**
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* Switches the internal blog ID.
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*
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* This changes the blog ID used to create keys in blog specific groups.
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*
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* @since 3.5.0
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*
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* @param int $blog_id Blog ID.
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*/
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public function switch_to_blog( $blog_id ) {
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$blog_id = (int) $blog_id;
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$this->blog_prefix = $this->multisite ? $blog_id . ':' : '';
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}
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/**
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* Serves as a utility function to determine whether a key exists in the cache.
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*
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* @since 3.4.0
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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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protected function _exists( $key, $group ) {
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return isset( $this->cache[ $group ] ) && ( isset( $this->cache[ $group ][ $key ] ) || array_key_exists( $key, $this->cache[ $group ] ) );
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}
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}
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