#441 Code Review of Order Creation Service

Perform a refactoring:

@RestController
@RequestMapping("/orders")
public class OrderController {

    @Autowired
    private OrderService orderService;

    @PostMapping
    public ResponseEntity<String> createOrder(@RequestBody OrderRequest request) {
        orderService.processOrder(request);
        return ResponseEntity.ok("ok");
    }
}

@Service
public class OrderService {

    @Autowired
    private OrderRepository orderRepository;

    @Autowired
    private KafkaTemplate<String, String> kafkaTemplate;

    public void processOrder(OrderRequest request) {
        Order order = new Order();
        order.setUserId(request.getUserId());
        order.setTotal(request.getTotal());
        order.setStatus("NEW");
        orderRepository.save(order);

        kafkaTemplate.send("orders", String.valueOf(order.getId()), "order_created");
    }
}

@Entity
@Data
public class Order {
    @Id
    @GeneratedValue
    private long id;

    private String userId;
    private String status;
    private BigDecimal total;
}

@Data
public class OrderRequest {
    private String userId;
    private BigDecimal total;
}