Sulu\Component\Websocket\MessageDispatcher\MessageHandlerContext::get PHP Method

    public function get($name)
    {
        return $this->parameters->get($name);
    }

 /**
  * {@inheritdoc}
  */
 public function onClose(ConnectionInterface $conn, MessageHandlerContext $context)
 {
     $this->preview->stop($context->get('previewToken'));
     $context->clear();
 }