Implementing DDD in your project

This presentation shows a simple approach of a DDD implementation in your project.
Was exposed in PHP Barcelona first Monthly Talk (Barcelona)

Transcript

1. Sergio Moya @soyelsergillo IN
2. @SOYELSERGILLO GITHUB.COM/SMOYA Backend Engineer at Social Point ! DDD Fan ! Hip Hop Culture lover ! Badaloní (from Badalona) SERGIO
3. WHAT
4. MODEL 3 2 4 1 DOMAIN CONTEXT UBIQUITOUS
5. UBIQUITOUS
6. KNOW YOUR UBIQUITOUS LANGUAGE
7. The Lead of the Backend engineers team has decided to split the team into smaller two-member teams. ! Each team will develop a different component. ! Our team will develop the Payment Component
9. THE
10. OUR
12. GENERATING
13. THE
14. THE
15. AND
16. THE
17. SERVICE ORM CONTRO LLER REPOSIT ORY DB MANAGER YOUR
18. THIS IS WAR!
19. BUT YOU WANT THIS
20. BUT WE WANT THIS TODAY YOU WILL GET THIS
21. LET’S
22. …⋯ SRC …⋯ …⋯ PAYMENTBUNDLE …⋯ COMPONENT PAYMENT BUNDLE FILE
23. OUR
24. OUR
25. OUR
26. We are recording Events!
27. BUT WHAT IS A DOMAIN EVENT?
28. “CAPTURES
29. DOMAIN
30. DOMAIN
31. DOMAIN
32. DOMAIN
33. REMEMBER A CUSTOMER CAN ORDER A PRODUCT ! A CUSTOMER CAN PAY AN ORDER
34. OUR
35. OUR
36. public function pay(Money $money)! {! try {! if (!$this->product->getPrice()->isEqualTo($money)) {! throw new OrderException('The Order amount is not satisfied');! }! $this->product->deliver($this->customer);! $this->status = OrderStatus::create(OrderStatus::ORDER_PAID);! } catch (\Exception $e) {! $this->status = OrderStatus::create(OrderStatus::ORDER_FAILED);! }! return $this->status;! } OUR
37. WHAT
38. WHAT
39. interface OrderRepository! {! public function exists($id);! ! public function find($id, $customerId);! ! public function findByCustomerId($customerId);! ! public function save($id, $productId, $customerId, $status = 1);! ! public function remove($id);! ! public function removeByCustomerId($customerId);! ! public function clearAll();! }! OUR
40. OK,
41. OK,
43. public function buyProductAction(Request $request)! {! $customer = new Customer($request->request->get('customerId'));! ! $productRepository = $this->get('tato.payment.product_respository');! $product = $productRepository->find($request->request->get('productId'));! ! $order = $customer->order($product);! ! $paid = new Money(! $request->request->get('paid'), ! $request->request->get(‘currency')! );! $status = $order->pay($paid);! ! $this->get(‘tato.payment.order_repository')->save(! ! ! $order->getId(), ! $product, ! $customer->getId(), ! $status->getStatus()! );! ! return new JsonResponse(array('status' => $status->getStatus()));! }! } A
44. public function buyProductAction(Request $request)! {! $customer = new Customer($request->request->get('customerId'));! ! $productRepository = $this->get('tato.payment.product_respository');! $product = $productRepository->find($request->request->get('productId'));! ! $order = $customer->order($product);! ! $paid = new Money(! $request->request->get('paid'), ! $request->request->get(‘currency')! );! $status = $order->pay($paid);! ! $this->get(‘tato.payment.order_repository')->save(! ! ! $order->getId(), ! $product, ! $customer->getId(), ! $status->getStatus()! );! ! return new JsonResponse(array('status' => $status->getStatus()));! }! } A
45. LET’S
46. TAKE A PIECE OF CQRS COMMAND QUERY RESPONSIBILITY SEGREGATION
47. Any method that mutates state. Any method that returns a value. COMMAND QUERY COMMAND
48. class BuyProductCommand! {! public $customerId;! ! public $productId;! ! public $paid;! ! public $currency;! ! public function __construct($customerId, $productId, $paid, $currency)! {! $this->customerId = $customerId;! $this->productId = $productId;! $this->paid = $paid;! $this->currency = $currency;! } ! } THE
49. public function handle(BuyProductCommand $command)! {! $customer = new Customer($command->customerId);! $product = $this->productRepository->find($command->productId);! ! $order = $customer->order($product);! $status = $order->pay(new Money($command->paid, $command->currency));! ! $events = $customer->getRecordedEvents();! ! // @todo do something with this events! ! $this->orderRepository->setOrder(! $command->gatewayName,! $order->getId(),! $command->customerId,! $status->getStatus()! );! ! return $order;! } A
50. COMPONENT
51. WE
52. IMAGINE
53. FILE
54. WE
55. OUR
56. CONSTRUCT
57. INFRASTRUCTURE
58. SERVICES services:! tato.payment.order_repository:! class: Tato\Component\Game\CustomOrderRepository! arguments:! - @doctrine.orm.entity_manager! ! tato.payment.product_repository:! class: Tato\Component\Game\Product\CustomProductRepository! arguments:! - @doctrine.orm.entity_manager! ! tato.payment.command.handler.buy_product:! class: Tato\Component\Payment\Command\BuyProductCommandHandler! arguments:! order_repository: @tato.payment.order_repository! product_repository: @tato.payment.product_repository!
59. AND
60. AND
61. PAYMENT
62. public function buyProductAction(Request $request)! {! $customer = new Customer($request->request->get('customerId'));! ! $productRepository = $this->get('tato.payment.product_respository');! $product = $productRepository->find($request->request->get('productId'));! ! $order = $customer->order($product);! ! $paid = new Money(! $request->request->get('paid'), ! $request->request->get(‘currency')! );! $status = $order->pay($paid);! ! $this->get(‘tato.payment.order_repository')->save(! ! ! $order->getId(), ! $product, ! $customer->getId(), ! $status->getStatus()! );! ! return new JsonResponse(array('status' => $status->getStatus()));! }! } THE
63. OUR
64. BE HEXAGONAL!
65. ENJOY DDD
66. LINKS
67. QUESTIONS?
68. Sergio Moya @soyelsergillo THANKS I’M