public function DynamicPageCacheSubscriber::onRequest in Drupal 9

Same name and namespace in other branches

1. 8 core/modules/dynamic_page_cache/src/EventSubscriber/DynamicPageCacheSubscriber.php \Drupal\dynamic_page_cache\EventSubscriber\DynamicPageCacheSubscriber::onRequest()
2. 10 core/modules/dynamic_page_cache/src/EventSubscriber/DynamicPageCacheSubscriber.php \Drupal\dynamic_page_cache\EventSubscriber\DynamicPageCacheSubscriber::onRequest()

Sets a response in case of a Dynamic Page Cache hit.

Parameters

\Symfony\Component\HttpKernel\Event\RequestEvent $event: The event to process.

File

core/modules/dynamic_page_cache/src/EventSubscriber/DynamicPageCacheSubscriber.php, line 125

Class

DynamicPageCacheSubscriber

Returns cached responses as early and avoiding as much work as possible.

Namespace

Drupal\dynamic_page_cache\EventSubscriber

Code

public function onRequest(RequestEvent $event) {

  // Don't cache the response if the Dynamic Page Cache request policies are
  // not met. Store the result in a static keyed by current request, so that
  // onResponse() does not have to redo the request policy check.
  $request = $event
    ->getRequest();
  $request_policy_result = $this->requestPolicy
    ->check($request);
  $this->requestPolicyResults[$request] = $request_policy_result;
  if ($request_policy_result === RequestPolicyInterface::DENY) {
    return;
  }

  // Sets the response for the current route, if cached.
  $cached = $this->renderCache
    ->get($this->dynamicPageCacheRedirectRenderArray);
  if ($cached) {
    $response = $this
      ->renderArrayToResponse($cached);
    $response->headers
      ->set(self::HEADER, 'HIT');
    $event
      ->setResponse($response);
  }
}