*
   * @param loader the cache loader used to obtain new values
   * @return a cache having the requested features
   */
  public <K1 extends K, V1 extends V> LoadingCache<K1, V1> build(
      CacheLoader<? super K1, V1> loader) {
    checkWeightWithWeigher();
    return new LocalCache.LocalLoadingCache<>(this, loader);
  }

  /**

        final FessConfig fessConfig = ComponentUtil.getFessConfig();
        final FileTemplateLoader loader = new FileTemplateLoader(ResourceUtil.getViewTemplatePath().toFile());
        final Handlebars handlebars = new Handlebars(loader);

        Locale locale = ComponentUtil.getRequestManager().getUserLocale();
        if (locale == null) {
            locale = Locale.ENGLISH;

			uerr := globalIAMSys.store.loadUsers(ctx, regUser, userAccounts)
			if uerr != nil {
				return info, errSRBackendIssue(uerr)
			}

			serr := globalIAMSys.store.loadUsers(ctx, svcUser, userAccounts)
			if serr != nil {
				return info, errSRBackendIssue(serr)
			}

			terr := globalIAMSys.store.loadUsers(ctx, stsUser, userAccounts)
			if terr != nil {

}

// load the cache content with name from minioMetaBackgroundOpsBucket.
// Only backend errors are returned as errors.
// The loader is optimistic and has no locking, but tries 5 times before giving up.
// If the object is not found, a nil error with empty data usage cache is returned.

				writeErrorResponse(ctx, w, exportError(ctx, err, iamFile, ""), r.URL)
				return
			}
		case allUsersFile:
			userIdentities := make(map[string]UserIdentity)
			err := globalIAMSys.store.loadUsers(ctx, regUser, userIdentities)
			if err != nil {
				writeErrorResponse(ctx, w, exportError(ctx, err, iamFile, ""), r.URL)
				return
			}
			userAccounts := make(map[string]madmin.AddOrUpdateUserReq)