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<?php
/**
 * @file
 * Contains \Drupal\Core\EventSubscriber\CacheRouterRebuildSubscriber.
 */
namespace Drupal\Core\EventSubscriber;
use Drupal\Core\Cache\Cache;
use Drupal\Core\Routing\RoutingEvents;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;
/**
 * Clear cache tags when the router is rebuilt.
 */
class CacheRouterRebuildSubscriber implements EventSubscriberInterface {
  /**
   * {@inheritdoc}
   */
  public function onRouterFinished() {
    // Requested URLs that formerly gave a 403/404 may now be valid.
    // Also invalidate all cached routing.
    Cache::invalidateTags(['4xx-response', 'route_match']);
  }
  /**
   * {@inheritdoc}
   */
  public static function getSubscribedEvents() {
    $events = [];
    // Act only when the router rebuild is finished.
    $events[RoutingEvents::FINISHED][] = ['onRouterFinished', 200];
    return $events;
  }
}