code: final void clear() {
          while (!resolveCache.isEmpty()) {
              for (Iterator<Entry<String, Entries>> i = resolveCache.entrySet().iterator(); i.hasNext();) {
                  Map.Entry<String, Entries> e = i.next();
                  i.remove();
  
                  e.getValue().clearAndCancel();
              }
          }
      }
docs: Remove everything from the cache.