Flarum\Core\Post\Floodgate::assertNotFlooding PHP Method

    public function assertNotFlooding(User $actor)
    {
        if ($this->isFlooding($actor)) {
            throw new FloodingException();
        }
    }

 /**
  * {@inheritdoc}
  */
 protected function data(ServerRequestInterface $request, Document $document)
 {
     $actor = $request->getAttribute('actor');
     if (!$request->getAttribute('bypassFloodgate')) {
         $this->floodgate->assertNotFlooding($actor);
     }
     $discussion = $this->bus->dispatch(new StartDiscussion($actor, array_get($request->getParsedBody(), 'data', [])));
     // After creating the discussion, we assume that the user has seen all
     // of the posts in the discussion; thus, we will mark the discussion
     // as read if they are logged in.
     if ($actor->exists) {
         $this->bus->dispatch(new ReadDiscussion($discussion->id, $actor, 1));
     }
     return $discussion;
 }