class CacheTagPreloadSubscriber

Preloads frequently used cache tags.

Hierarchy

  • class \Drupal\Core\Cache\EventSubscriber\CacheTagPreloadSubscriber implements \Symfony\Component\EventDispatcher\EventSubscriberInterface

Expanded class hierarchy of CacheTagPreloadSubscriber

1 string reference to 'CacheTagPreloadSubscriber'
core.services.yml in core/core.services.yml
core/core.services.yml
1 service uses CacheTagPreloadSubscriber
cache_tags.preloader in core/core.services.yml
Drupal\Core\Cache\EventSubscriber\CacheTagPreloadSubscriber

File

View on git.drupalcode.org

core/lib/Drupal/Core/Cache/EventSubscriber/CacheTagPreloadSubscriber.php, line 15

Namespace

Drupal\Core\Cache\EventSubscriber
View source 
class CacheTagPreloadSubscriber implements EventSubscriberInterface {
  public function __construct(protected CacheTagsChecksumInterface $cacheTagsChecksum) {
  }
  
  /**
   * Preloads frequently used cache tags.
   *
   * @param \Symfony\Component\HttpKernel\Event\RequestEvent $event
   *   The request event.
   */
  public function onRequest(RequestEvent $event) : void {
    if ($event->isMainRequest() && $this->cacheTagsChecksum instanceof CacheTagsChecksumPreloadInterface) {
      $default_preload_cache_tags = array_merge([
        'route_match',
        'access_policies',
        'routes',
        'router',
        'entity_types',
        'entity_field_info',
        'entity_bundles',
        'local_task',
        'library_info',
      ], Settings::get('cache_preload_tags', []));
      $this->cacheTagsChecksum
        ->registerCacheTagsForPreload($default_preload_cache_tags);
    }
  }
  
  /**
   * {@inheritdoc}
   */
  public static function getSubscribedEvents() : array {
    $events[KernelEvents::REQUEST][] = [
      'onRequest',
      500,
    ];
    return $events;
  }

}

Members

Title Modifiers Object type Summary
CacheTagPreloadSubscriber::getSubscribedEvents public static function
CacheTagPreloadSubscriber::onRequest public function Preloads frequently used cache tags.
CacheTagPreloadSubscriber::__construct public function

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