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<?php
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 as well as every HTTP response.
Cache::invalidateTags(['4xx-response', 'route_match', 'http_response']);
}
/**
* {@inheritdoc}
*/
public static function getSubscribedEvents(): array {
$events = [];
// Act only when the router rebuild is finished.
$events[RoutingEvents::FINISHED][] = ['onRouterFinished', 200];
return $events;
}
}
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