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;