DDD

Talk given by Jefersson Nathan (@malukenho) at PHP Experience 2017

Transcript

1. DDD
2. @malukenho
4. DDD É PRA MIM?
6. Quantos livros é preciso ler para entender um livro?
8. FILOSOFIA
9. Tackling Complexity
10. Heart of Software
11. Core Domain
12. Auth Core Domain
13. Domain
15. Modelo
16. Domain Model
18. Você tem que estar mortalmente interessado, no problema que está envolvido.
19. “Yo soy yo y mi circunstancia.” Ortega y Gasset
20. Problemas de comunicação
22. Ubiquitous Language
23. Literate Programming
24. When Given Then
25. Scenario: Buying a single product under £10 Given there is a "Sith Lord Lightsaber", which costs £5 When I add the "Sith Lord Lightsaber" to the basket Then I should have 1 product in the basket And the overall basket price should be £9
26. STATUS QUAESTIONIS
27. Ninguém pode dar o que não tem.
28. BBoM
29. is_array($object); 22,748,480
30. Event Storming
31. VALUE OBJECT
32. ATOMIC STEP
33. SELF VALIDATED
34. <?php
 
 declare(strict_types=1);
 
 final class Email
 {
 private $email;
 
 private function __construct(string $email)
 { Assert::isValidEmail($email); 
 $this->email = $email;
 }
 
 public static function fromString(string $email) : self
 {
 return new self($email);
 }
 }
35. new User('malukenho', 5);
36. NAMED CONSTRUCTOR
37. User::fromNameAndFingersByHand( 'malukenho', 5 );
38. <?php
 
 declare(strict_types=1);
 
 final class RegisterUser
 {
 private $username;
 
 private function __construct(string $username)
 {
 $this->username = $username;
 }
 
 public static function fromString(string $username) : self
 {
 return new self($username);
 } public static function fromUser(User $user) : self
 {
 return new self($user->getUsername());
 }
 }
39. ANEMIC DOMAIN
40. IMMUTABLE
41. Potentially mutable operation
42. Money Pattern
43. <?php
 
 declare(strict_types=1); final class Money { public function __construct(int $amount, Currency $currency) { $this->amount = $amount; $this->currency = $currency; } }
44. <?php
 
 declare(strict_types=1); final class Money { public function increaseAmountBy(int $amount) : self { return new self( $this->amount() + $amount, $this->currency() ); } }
45. Entidades
46. *Identidade
47. UUID
48. 
 Uuid::uuid4(); // 7b733ff1-42d2-4638-b7bd-411997c32b11 Value Object
49. EVITAR INVALID STATE DA ENTIDADE
50. INDEPENDE DE STORAGE
51. #TIPS
52. PERSISTÊNCIA ORM
53. NÃO USE ANNOTATIONS
54. Delivery Mechanism
55. DDD É PRA MIM?
56. Sylius
57. PERGUNTAS?
58. THANKS! @malukenho