private Function<KsqlConfig, Kudf> getUdfFactory(
      final Method method,
      final UdfDescription udfDescriptionAnnotation,
      final String functionName,
      final FunctionInvoker invoker,
      final String sensorName
  ) {
    return ksqlConfig -> {
      final Object actualUdf = FunctionLoaderUtils.instantiateFunctionInstance(
          method.getDeclaringClass(), udfDescriptionAnnotation.name());
      if (actualUdf instanceof Configurable) {
        ExtensionSecurityManager.INSTANCE.pushInUdf();
        try {
          ((Configurable) actualUdf)
              .configure(ksqlConfig.getKsqlFunctionsConfigProps(functionName));
        } finally {
          ExtensionSecurityManager.INSTANCE.popOutUdf();
        }
      }
      final PluggableUdf theUdf = new PluggableUdf(invoker, actualUdf);
      return metrics.<Kudf>map(m -> new UdfMetricProducer(
          m.getSensor(sensorName),
          theUdf,
          Time.SYSTEM
      )).orElse(theUdf);
    };
  }
@Test
  public void shouldLoadLambdaTransformUdfs() {
    // Given:
    final SqlLambdaResolved lambda =
        SqlLambdaResolved.of(
            ImmutableList.of(SqlTypes.INTEGER),
            SqlTypes.INTEGER);

    // When:
    final KsqlScalarFunction fun = FUNC_REG.getUdfFactory(FunctionName.of("transform"))
        .getFunction(
            ImmutableList.of(
                SqlArgument.of(SqlArray.of(SqlTypes.INTEGER)),
                SqlArgument.of(lambda)));

    // Then:
    assertThat(fun.name().text(), equalToIgnoringCase("transform"));
  }