private function TraceableEventDispatcher::preDispatch

File

drupal/core/vendor/symfony/http-kernel/Symfony/Component/HttpKernel/Debug/TraceableEventDispatcher.php, line 367

Class

TraceableEventDispatcher

Collects some data about event listeners.

Namespace

Code

private function preDispatch($eventName, Event $event) {

  // wrap all listeners before they are called
  $this->wrappedListeners[$this->id] = new \SplObjectStorage();
  $listeners = $this->dispatcher
    ->getListeners($eventName);
  foreach ($listeners as $listener) {
    $this->dispatcher
      ->removeListener($eventName, $listener);
    $wrapped = $this
      ->wrapListener($eventName, $listener);
    $this->wrappedListeners[$this->id][$wrapped] = $listener;
    $this->dispatcher
      ->addListener($eventName, $wrapped);
  }
  switch ($eventName) {
    case KernelEvents::REQUEST:
      $this->stopwatch
        ->openSection();
      break;
    case KernelEvents::VIEW:
    case KernelEvents::RESPONSE:

      // stop only if a controller has been executed
      if ($this->stopwatch
        ->isStarted('controller')) {
        $this->stopwatch
          ->stop('controller');
      }
      break;
    case KernelEvents::TERMINATE:
      $token = $event
        ->getResponse()->headers
        ->get('X-Debug-Token');

      // There is a very special case when using builtin AppCache class as kernel wrapper, in the case
      // of an ESI request leading to a `stale` response [B]  inside a `fresh` cached response [A].
      // In this case, `$token` contains the [B] debug token, but the  open `stopwatch` section ID
      // is equal to the [A] debug token. Trying to reopen section with the [B] token throws an exception
      // which must be caught.
      try {
        $this->stopwatch
          ->openSection($token);
      } catch (\LogicException $e) {
      }
      break;
  }
}