/**
  * Set pre-created Memcache driver.
  *
  * @param DriverInterface $driver  Pre-created driver instance.
  * @param bool            $connect Force connection.
  */
 protected function setDriver(DriverInterface $driver, $connect = false)
 {
     $this->driver = $driver;
     if ($connect) {
         $this->driver->connect();
     }
 }