janis91 / ocr

     * @return \Redis

     */

    private function setupRedisInstance() {

        if (!extension_loaded('redis')) {

            $this->logger->debug(

                    'It seems that the message queueing capabilities are not available in your local php installation. Please install php-redis.');

            throw new NotFoundException($this->l10n->t('Message queueing capabilities are missing on the server.'));

        }

        $redis = new \Redis();

        if (!$redis->connect($this->redisHost, $this->redisPort, 2.5, NULL, 100)) {

            $this->logger->debug('Cannot connect to Redis.');

            throw new NotFoundException($this->l10n->t('Cannot connect to Redis.'));

        }

        if (!$redis->select($this->redisDb)) {

            $this->logger->debug('Cannot connect to the right Redis database.');

            throw new NotFoundException($this->l10n->t('Cannot connect to the right Redis database.'));

        }

        $redis->setOption(\Redis::OPT_PREFIX, OcrConstants::REDIS_KEY_PREFIX);

        return $redis;

    }