public function exec_cached($class_name = '', $method_name = '', $method_params = '', $tpl_name = '', $silent = false, $use_cache = true, $cache_ttl = -1, $cache_key_override = '')
    {
        return $this->_execute($class_name, $method_name, $method_params, $tpl_name, $silent, $use_cache, $cache_ttl, $cache_key_override);
    }