*
   * <p><b>Note:</b> this method is now unnecessary and should be treated as deprecated. Instead,
   * use the {@code HashSet} constructor directly, taking advantage of <a
   * href="http://goo.gl/iz2Wi">"diamond" syntax</a>.
   */
  public static <E extends @Nullable Object> HashSet<E> newHashSet() {
    return new HashSet<>();
  }

  /**
   * Creates a <i>mutable</i> {@code HashSet} instance initially containing the given elements.

    public int selectCount(CBCall<WebConfigCB> cbLambda) {
        return facadeSelectCount(createCB(cbLambda));
    }

    public OptionalEntity<WebConfig> selectEntity(CBCall<WebConfigCB> cbLambda) {
        return facadeSelectEntity(createCB(cbLambda));
    }

    protected OptionalEntity<WebConfig> facadeSelectEntity(WebConfigCB cb) {

    public int selectCount(CBCall<LabelTypeCB> cbLambda) {
        return facadeSelectCount(createCB(cbLambda));
    }

    public OptionalEntity<LabelType> selectEntity(CBCall<LabelTypeCB> cbLambda) {
        return facadeSelectEntity(createCB(cbLambda));
    }

    protected OptionalEntity<LabelType> facadeSelectEntity(LabelTypeCB cb) {

		Example: `  # Create a secret to access cluster c0's apiserver and install it in cluster c1.
  istioctl --kubeconfig=c0.yaml create-remote-secret --name c0 \
    | kubectl --kubeconfig=c1.yaml apply -f -

  # Delete a secret that was previously installed in c1
  istioctl --kubeconfig=c0.yaml create-remote-secret --name c0 \
    | kubectl --kubeconfig=c1.yaml delete -f -

  public static RateLimiter create(double permitsPerSecond, long warmupPeriod, TimeUnit unit) {
    checkArgument(warmupPeriod >= 0, "warmupPeriod must not be negative: %s", warmupPeriod);
    return create(
        permitsPerSecond, warmupPeriod, unit, 3.0, SleepingStopwatch.createFromSystemTimer());
  }

  @VisibleForTesting
  static RateLimiter create(
      double permitsPerSecond,
      long warmupPeriod,

    public int selectCount(CBCall<UserInfoCB> cbLambda) {
        return facadeSelectCount(createCB(cbLambda));
    }

    public OptionalEntity<UserInfo> selectEntity(CBCall<UserInfoCB> cbLambda) {
        return facadeSelectEntity(createCB(cbLambda));
    }

    protected OptionalEntity<UserInfo> facadeSelectEntity(UserInfoCB cb) {

    public int selectCount(CBCall<FileConfigCB> cbLambda) {
        return facadeSelectCount(createCB(cbLambda));
    }

    public OptionalEntity<FileConfig> selectEntity(CBCall<FileConfigCB> cbLambda) {
        return facadeSelectEntity(createCB(cbLambda));
    }

    protected OptionalEntity<FileConfig> facadeSelectEntity(FileConfigCB cb) {

    public int selectCount(CBCall<RelatedContentCB> cbLambda) {
        return facadeSelectCount(createCB(cbLambda));
    }

    public OptionalEntity<RelatedContent> selectEntity(CBCall<RelatedContentCB> cbLambda) {
        return facadeSelectEntity(createCB(cbLambda));
    }

    protected OptionalEntity<RelatedContent> facadeSelectEntity(RelatedContentCB cb) {

    public int selectCount(CBCall<RelatedQueryCB> cbLambda) {
        return facadeSelectCount(createCB(cbLambda));
    }

    public OptionalEntity<RelatedQuery> selectEntity(CBCall<RelatedQueryCB> cbLambda) {
        return facadeSelectEntity(createCB(cbLambda));
    }

    protected OptionalEntity<RelatedQuery> facadeSelectEntity(RelatedQueryCB cb) {

    public int selectCount(CBCall<RoleTypeCB> cbLambda) {
        return facadeSelectCount(createCB(cbLambda));
    }

    public OptionalEntity<RoleType> selectEntity(CBCall<RoleTypeCB> cbLambda) {
        return facadeSelectEntity(createCB(cbLambda));
    }

    protected OptionalEntity<RoleType> facadeSelectEntity(RoleTypeCB cb) {