public function banAll($domains = null, $contentType = null)
    {
        $this->cacheInvalidator->invalidateRegex('.*', $contentType, $domains);
        $this->logger->log(sprintf('Cleared all Varnish cache%s%s', $domains ? ' for domains "' . (is_array($domains) ? implode(', ', $domains) : $domains) . '"' : '', $contentType ? ' with content type "' . $contentType . '"' : ''));
        $this->execute();
    }