public function get($userId, $callId)
    {
        $key = $this->getCacheKey($userId, $callId);
        if (!isset($this->cache[$key])) {
            $data = $this->getStorage()->get($userId, $callId);
            $state = is_null($data) ? self::STATE_NOT_FOUND : self::STATE_ALIGNED;
            $this->putInCache($key, $userId, $callId, $data, $state);
        }

        return $this->getFromCache($key);
    }