public function getModuleNamespace()
    {
        if (!$this->module || '\\' == $this->module || '/' == $this->module) {
            return '\app';
        }
        if (isset($this->modules[$this->module]['namespace'])) {
            return $this->modules[$this->module]['namespace'];
        }
        return '\app\modules\\' . $this->module;
    }