izzum\statemachine\persistence\Redis::getRedis PHP Method

    public function getRedis()
    {
        //lazy loaded connection
        try {
            if ($this->redis === null) {
                $this->redis = new \Redis();
                if ($this->socket) {
                    $connected = $this->redis->connect($this->socket);
                } else {
                    /* default connection with different parameters */
                    if ($this->retry !== null) {
                        $connected = $this->redis->connect($this->host, $this->port, $this->timeout, null, $this->retry);
                    } else {
                        if ($this->reserved !== null) {
                            $connected = $this->redis->connect($this->host, $this->port, $this->timeout, $this->reserved);
                        } else {
                            $connected = $this->redis->connect($this->host, $this->port, $this->timeout);
                        }
                    }
                }
                if (!$connected) {
                    $this->redis = null;
                    throw new Exception('connection not made', Exception::PERSISTENCE_FAILED_TO_CONNECT);
                }
                if ($this->password) {
                    $authenticated = $this->redis->auth($this->password);
                    if (!$authenticated) {
                        throw new Exception('authentication failed', Exception::PERSISTENCE_FAILED_TO_CONNECT);
                    }
                }
                //set the database
                $this->redis->select($this->database);
                $this->redis->setOption(\Redis::OPT_PREFIX, $this->getPrefix());
                //hook for subclass
                $this->onConnect();
            }
            return $this->redis;
        } catch (\Exception $e) {
            throw new Exception(sprintf("error creating Redis connection: [%s]", $e->getMessage()), Exception::PERSISTENCE_FAILED_TO_CONNECT);
        }
    }