public function getMapper($mapperClass = null, array $options = [])
    {
        $mapperClass = $mapperClass ?? $this->mapper ?? $this->serviceAlias;

        if (!array_key_exists($mapperClass, $this->mappers)) {
            $this->setMapper($mapperClass, $options);
        }

        return $this->mappers[$mapperClass];
    }