public function getPluginStorage($pluginName, $userLogin)
    {
        $id = $pluginName . '#' . $userLogin;

        if (!isset($this->cache[$id])) {
            $backend = new Backend\PluginSettingsTable($pluginName, $userLogin);
            $this->cache[$id] = $this->makeStorage($backend);
        }

        return $this->cache[$id];
    }