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old/wp-includes/class-wp-metadata-lazyloader.php
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old/wp-includes/class-wp-metadata-lazyloader.php
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<?php
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/**
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* Meta API: WP_Metadata_Lazyloader class
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*
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* @package WordPress
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* @subpackage Meta
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* @since 4.5.0
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*/
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/**
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* Core class used for lazy-loading object metadata.
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*
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* When loading many objects of a given type, such as posts in a WP_Query loop, it often makes
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* sense to prime various metadata caches at the beginning of the loop. This means fetching all
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* relevant metadata with a single database query, a technique that has the potential to improve
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* performance dramatically in some cases.
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*
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* In cases where the given metadata may not even be used in the loop, we can improve performance
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* even more by only priming the metadata cache for affected items the first time a piece of metadata
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* is requested - ie, by lazy-loading it. So, for example, comment meta may not be loaded into the
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* cache in the comments section of a post until the first time get_comment_meta() is called in the
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* context of the comment loop.
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*
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* WP uses the WP_Metadata_Lazyloader class to queue objects for metadata cache priming. The class
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* then detects the relevant get_*_meta() function call, and queries the metadata of all queued objects.
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*
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* Do not access this class directly. Use the wp_metadata_lazyloader() function.
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*
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* @since 4.5.0
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*/
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#[AllowDynamicProperties]
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class WP_Metadata_Lazyloader {
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/**
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* Pending objects queue.
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*
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* @since 4.5.0
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* @var array
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*/
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protected $pending_objects;
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/**
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* Settings for supported object types.
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*
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* @since 4.5.0
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* @var array
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*/
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protected $settings = array();
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/**
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* Constructor.
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*
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* @since 4.5.0
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*/
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public function __construct() {
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$this->settings = array(
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'term' => array(
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'filter' => 'get_term_metadata',
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'callback' => array( $this, 'lazyload_meta_callback' ),
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),
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'comment' => array(
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'filter' => 'get_comment_metadata',
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'callback' => array( $this, 'lazyload_meta_callback' ),
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),
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'blog' => array(
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'filter' => 'get_blog_metadata',
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'callback' => array( $this, 'lazyload_meta_callback' ),
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),
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);
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}
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/**
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* Adds objects to the metadata lazy-load queue.
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*
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* @since 4.5.0
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*
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* @param string $object_type Type of object whose meta is to be lazy-loaded. Accepts 'term' or 'comment'.
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* @param array $object_ids Array of object IDs.
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* @return void|WP_Error WP_Error on failure.
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*/
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public function queue_objects( $object_type, $object_ids ) {
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if ( ! isset( $this->settings[ $object_type ] ) ) {
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return new WP_Error( 'invalid_object_type', __( 'Invalid object type.' ) );
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}
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$type_settings = $this->settings[ $object_type ];
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if ( ! isset( $this->pending_objects[ $object_type ] ) ) {
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$this->pending_objects[ $object_type ] = array();
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}
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foreach ( $object_ids as $object_id ) {
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// Keyed by ID for faster lookup.
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if ( ! isset( $this->pending_objects[ $object_type ][ $object_id ] ) ) {
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$this->pending_objects[ $object_type ][ $object_id ] = 1;
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}
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}
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add_filter( $type_settings['filter'], $type_settings['callback'], 10, 5 );
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/**
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* Fires after objects are added to the metadata lazy-load queue.
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*
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* @since 4.5.0
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*
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* @param array $object_ids Array of object IDs.
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* @param string $object_type Type of object being queued.
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* @param WP_Metadata_Lazyloader $lazyloader The lazy-loader object.
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*/
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do_action( 'metadata_lazyloader_queued_objects', $object_ids, $object_type, $this );
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}
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/**
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* Resets lazy-load queue for a given object type.
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*
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* @since 4.5.0
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*
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* @param string $object_type Object type. Accepts 'comment' or 'term'.
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* @return void|WP_Error WP_Error on failure.
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*/
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public function reset_queue( $object_type ) {
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if ( ! isset( $this->settings[ $object_type ] ) ) {
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return new WP_Error( 'invalid_object_type', __( 'Invalid object type.' ) );
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}
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$type_settings = $this->settings[ $object_type ];
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$this->pending_objects[ $object_type ] = array();
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remove_filter( $type_settings['filter'], $type_settings['callback'] );
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}
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/**
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* Lazy-loads term meta for queued terms.
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*
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* This method is public so that it can be used as a filter callback. As a rule, there
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* is no need to invoke it directly.
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*
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* @since 4.5.0
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* @deprecated 6.3.0 Use WP_Metadata_Lazyloader::lazyload_meta_callback() instead.
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*
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* @param mixed $check The `$check` param passed from the 'get_term_metadata' hook.
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* @return mixed In order not to short-circuit `get_metadata()`. Generally, this is `null`, but it could be
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* another value if filtered by a plugin.
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*/
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public function lazyload_term_meta( $check ) {
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_deprecated_function( __METHOD__, '6.3.0', 'WP_Metadata_Lazyloader::lazyload_meta_callback' );
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return $this->lazyload_meta_callback( $check, 0, '', false, 'term' );
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}
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/**
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* Lazy-loads comment meta for queued comments.
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*
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* This method is public so that it can be used as a filter callback. As a rule, there is no need to invoke it
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* directly, from either inside or outside the `WP_Query` object.
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*
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* @since 4.5.0
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* @deprecated 6.3.0 Use WP_Metadata_Lazyloader::lazyload_meta_callback() instead.
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*
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* @param mixed $check The `$check` param passed from the {@see 'get_comment_metadata'} hook.
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* @return mixed The original value of `$check`, so as not to short-circuit `get_comment_metadata()`.
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*/
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public function lazyload_comment_meta( $check ) {
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_deprecated_function( __METHOD__, '6.3.0', 'WP_Metadata_Lazyloader::lazyload_meta_callback' );
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return $this->lazyload_meta_callback( $check, 0, '', false, 'comment' );
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}
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/**
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* Lazy-loads meta for queued objects.
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*
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* This method is public so that it can be used as a filter callback. As a rule, there
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* is no need to invoke it directly.
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*
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* @since 6.3.0
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*
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* @param mixed $check The `$check` param passed from the 'get_*_metadata' hook.
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* @param int $object_id ID of the object metadata is for.
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* @param string $meta_key Unused.
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* @param bool $single Unused.
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* @param string $meta_type Type of object metadata is for. Accepts 'post', 'comment', 'term', 'user',
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* or any other object type with an associated meta table.
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* @return mixed In order not to short-circuit `get_metadata()`. Generally, this is `null`, but it could be
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* another value if filtered by a plugin.
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*/
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public function lazyload_meta_callback( $check, $object_id, $meta_key, $single, $meta_type ) {
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if ( empty( $this->pending_objects[ $meta_type ] ) ) {
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return $check;
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}
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$object_ids = array_keys( $this->pending_objects[ $meta_type ] );
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if ( $object_id && ! in_array( $object_id, $object_ids, true ) ) {
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$object_ids[] = $object_id;
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}
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update_meta_cache( $meta_type, $object_ids );
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// No need to run again for this set of objects.
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$this->reset_queue( $meta_type );
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return $check;
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}
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}
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