private function databaseCache($cache_engine, $cache_engine_host, $cache_engine_port)
{
$preferencesService = $this->container->get('system_preferences_service');
$preferencesService->set('DBCacheEngine', $cache_engine);
$preferencesService->set('DBCacheEngineHost', $cache_engine_host);
$preferencesService->set('DBCacheEnginePort', $cache_engine_port);
}