Sonata\Component\Basket\BasketInterface::getCustomerId PHP Method

    public function getCustomerId();

 /**
  * {@inheritdoc}
  */
 public function save(BasketInterface $basket)
 {
     if ($basket->getCustomerId()) {
         $this->basketManager->save($basket);
     } else {
         $this->session->set(BasketSessionFactory::SESSION_BASE_NAME . 'new', $basket);
     }
 }