if (links == null) {
            log.trace("Loadings roots");
            final String refServerName = domain;
            dr = fetchRootReferral(tf, domain, root, refServerName);
            links = cacheRootReferral(tf, domain, root, roots, dr, links);
        } else if (links instanceof NegativeCacheEntry) {
            links = null;
        } else {
            dr = links.map.get("\\");
        }