public function renderJSON(MvcEvent $event)
    {
        if (!$this->hasRunned) {
            $valueToPlainStati = array(1 => 'error', 2 => 'error', 3 => 'error', 4 => 'error', 5 => 'success', 6 => 'info', 7 => 'info');
            $viewModel = $event->getViewModel();
            if ($viewModel instanceof JsonModel) {
                if (!empty($this->notifications)) {
                    $jsonNotifications = $viewModel->getVariable('notifications', array());
                    foreach ($this->notifications as $notification) {
                        $status = 'info';
                        if (array_key_exists($notification->getPriority(), $valueToPlainStati)) {
                            $status = $valueToPlainStati[$notification->getPriority()];
                        }
                        $jsonNotifications[] = array(
                            'text' => $notification->getNotification(),
                            'status' => $status
                        );
                    }
                    $viewModel->setVariable('notifications', $jsonNotifications);
                }
                $this->hasRunned = true;
            }
        }
        return;
    }