protected function getReflectionMethod($class, $method)
    {
        if (!isset($this->methodReflectors[$class])) {
            $this->methodReflectors[$class] = [];
        }
        if (!isset($this->methodReflectors[$class][$method])) {
            $this->methodReflectors[$class][$method] = new \ReflectionMethod($class, $method);
        }

        return $this->methodReflectors[$class][$method];
    }