Interface for a query that accepts placeholders. Hierarchy interface \Drupal\Core\Database\Query\PlaceholderInterface File core/lib/Drupal/Core/Database/Query/PlaceholderInterface.php, line 8 Namespace Drupal\Core\Database\Query Members Name Modifiers Type Description PlaceholderInterface::nextPlaceholder public function Returns the next placeholder ID for the query. PlaceholderInterface::uniqueIdentifier public function Returns a unique identifier for this objec

public PlaceholderingRenderCache::__construct(RequestStack $request_stack, CacheFactoryInterface $cache_factory, CacheContextsManager $cache_contexts_manager, PlaceholderGeneratorInterface $placeholder_generator) Constructs a new PlaceholderingRenderCache object. Parameters \Symfony\Component\HttpFoundation\RequestStack $request_stack: The request stack. \Drupal\Core\Cache\CacheFactoryInterface $cache_factory: The cache factory. \Drupal\Core\Cache\Context\CacheContextsManager $cache_contexts_m

public PlaceholderingRenderCache::set(array &$elements, array $pre_bubbling_elements) Caches the rendered output of a renderable array. May be called by an implementation of \Drupal\Core\Render\RendererInterface while rendering, if the #cache property is set. Parameters array $elements: A renderable array. array $pre_bubbling_elements: A renderable array corresponding to the state (in particular, the cacheability metadata) of $elements prior to the beginning of its rendering process, and t

protected PlaceholderingRenderCache::getFromPlaceholderResultsCache(array $elements) Retrieves an auto-placeholdered renderable array from the static cache. Parameters array $elements: A renderable array. Return value array|false A renderable array, with the original element and all its children pre- rendered, or FALSE if no cached copy of the element is available. File core/lib/Drupal/Core/Render/PlaceholderingRenderCache.php, line 179 Class PlaceholderingRenderCache Adds automatic plac

public PlaceholderingRenderCache::get(array $elements) Gets the cached, pre-rendered element of a renderable element from cache. Parameters array $elements: A renderable array. Return value array|false A renderable array, with the original element and all its children pre- rendered, or FALSE if no cached copy of the element is available. Overrides RenderCache::get See also \Drupal\Core\Render\RendererInterface::render() ::set() File core/lib/Drupal/Core/Render/PlaceholderingRenderCache.php,

protected PlaceholderingRenderCache::createPlaceholderAndRemember(array $rendered_elements, array $pre_bubbling_elements) Create a placeholder for a renderable array and remember in a static cache. Parameters array $rendered_elements: A fully rendered renderable array. array $pre_bubbling_elements: A renderable array corresponding to the state (in particular, the cacheability metadata) of $rendered_elements prior to the beginning of its rendering process, and therefore before any bubbling of c

Stores rendered results for automatically placeholdered elements. This allows us to avoid talking to the cache twice per auto-placeholdered element, or in case of an uncacheable element, to render it twice. Scenario A. The double cache read would happen because: 1. when rendering, cache read, but auto-placeholdered 2. when rendering placeholders, again cache read Scenario B. The cache write plus read would happen because: 1. when rendering, cache write, but auto-placeholdered 2. when rendering

The placeholder generator. Type: \Drupal\Core\Render\PlaceholderGeneratorInterface File core/lib/Drupal/Core/Render/PlaceholderingRenderCache.php, line 47 Class PlaceholderingRenderCache Adds automatic placeholdering to the RenderCache. Namespace Drupal\Core\Render Code protected $placeholderGenerator;

Adds automatic placeholdering to the RenderCache. This automatic placeholdering is performed to ensure the containing elements and overarching response are as cacheable as possible. Elements whose subtree bubble either max-age=0 or high-cardinality cache contexts (such as 'user' and 'session') are considered poorly cacheable. Automatic placeholdering is performed only on elements whose subtree was generated using a #lazy_builder callback and whose bubbled cacheability meets the auto-placeholder

public PlaceholderGeneratorInterface::shouldAutomaticallyPlaceholder(array $element) Whether the given render array should be automatically placeholdered. The render array should be placeholdered if its cacheability either has a cache context with too high cardinality, a cache tag with a too high invalidation rate, or a max-age that is too low. Either of these would make caching ineffective, and thus we choose to placeholder instead. Parameters array $element: The render array whose cacheabili