class FacultyStaffRedirectSubscriber implements EventSubscriberInterface {


  public function checkForRedirection(GetResponseEvent $event) {
    $request = Drupal::request();
    $requestUrl = Drupal::service('path.current')->getPath();
    $current_user = Drupal::currentUser();
    $roles = $current_user->getRoles();

    if ($requestUrl == '/faculty-staff') {
        if (
          !in_array('faculty', $roles) ||
          !in_array('staff', $roles)
        ) {

            $path =  '/404';
        $response = new RedirectResponse($path);
        $response->send();
        return;
            }
    }
  }
 public static function getSubscribedEvents() {
    $events[KernelEvents::REQUEST][] = array('checkForRedirection');
    return $events;
  }

}