private function readFromCache()
    {
        if (($config = $this->cacheConfig->getCacheManager()->get($this->cacheConfig->getKey())) !== null) {
            return $config;
        }
        $config = $this->read();
        $this->cacheConfig->getCacheManager()->set(
            $this->cacheConfig->getKey(),
            $config,
            $this->cacheConfig->getTtl()
        );

        return $config;
    }