Domain-driven Design in PHP and Symfony - Drupal Camp Wroclaw!
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Domain-driven Design in PHP and Symfony - Drupal Camp Wrocław 18/10/2014 More Domain-Driven Design related content at: https://domaincentric.net/
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Domain-driven Design in PHP and Symfony - Drupal Camp Wroclaw!
- 1. Domain-Driven Design in PHP & Symfony
- 2. Kacper Gunia @cakper Software Engineer @SensioLabsUK Symfony Certified Developer PHPers Silesia @PHPersPL
- 6. How to tackle it?
- 7. Domain-Driven Design is ! an approach to the development of complex software in which we: –Eric Evans
- 8. 1. Focus on the core domain. –Eric Evans
- 9. 2. Explore model in ! a creative collaboration of domain practitioners and software practitioners. –Eric Evans
- 10. 3. Speak an ubiquitous language within an explicitly bounded context. –Eric Evans
- 11. When to use DDD?
- 12. Complex domain
- 13. Domain Experts
- 16. Strategic DDD
- 17. Strategy! ! Stratos - army/resources! Ago - leading
- 18. Strategy! ! ! = What
- 19. Bounded Context
- 20. Bounded contexts of product ❖ Catalogue! ❖ Sales! ❖Marketing! ❖Warehouse
- 22. Core Domain
- 26. UI SERVICE UNIT
- 27. Refactoring Towards Deeper Insight
- 28. Tactical DDD
- 29. Tactics! ! Taktike - the art of organising an army, a maneuver
- 30. Tactics! ! ! = How
- 31. Building Blocks
- 33. USER INTERFACE APPLICATION DOMAIN INFRASTRUCTURE
- 34. . └── src └── Dcwroc ├── Shopping ├── Emejzon ├── EmejzonBundle └── DoctrineAdapter
- 35. Entities
- 36. class Sale { (…) private $id; ! function __construct($name, DateTimeInterface $dueDate) { $this-‐>name = $name; $this-‐>dueDate = $dueDate; } ! public function getId() { return $this-‐>id; } }
- 37. class Sale { (…) public function activate() { if (true === $this-‐>active) { throw new LogicException('Sale already activated!'); } ! $this-‐>active = true; } }
- 38. Value objects
- 39. class Email { (…) public function __construct($email) { if (!filter_var($email, FILTER_VALIDATE_EMAIL)) { throw new InvalidArgumentException(); } ! $this-‐>email = $email; } ! function asString() { return $this-‐>email; } }
- 40. Aggregates
- 41. class Order {(…) function __construct( Customer $customer, ProductList $productList ){ $this-‐>customer = $customer; $this-‐>productList = $productList; $this-‐>status = Status::open(); } ! public function getTotal(); }
- 42. Repositories
- 43. interface OrderRepository { public function save(Order $order); ! public function remove(Order $order); public function findById($orderId); ! public function findObsolete(); }
- 44. class DoctrineOrderRepository implements OrderRepository {} ! class FileOrderRepository implements OrderRepository {} ! class InMemoryOrderRepository implements OrderRepository {}
- 45. Factories
- 46. class CustomerFactory { public function register(Email $email, Password $password) { (...) ! return $customer; } }
- 47. Services
- 48. interface Notifier { public function send(Message $message); }
- 49. class EmailNotifier implements Notifier { private $mailer; ! function __construct(Swift_Mailer $mailer) { $this-‐>mailer = $mailer; } ! public function send(Message $message) { (…) } }
- 50. Domain Events
- 51. class ResetPassword { function request(Email $email) { $user = $this-‐>userRepository-‐>findOneByEmail($email); ! if (!$user instanceof User) { return $this-‐>raise(new UserDoesNotExistEvent($email)); } ! $request = Password::requestReset($user); $this-‐>passwordResetRequestRepository-‐>save($request); $this-‐>raise(new RequestIssuedEvent($request)); } }
- 52. class ResetPassword { function request(Email $email) { $user = $this-‐>userRepository-‐>findOneByEmail($email); ! if (!$user instanceof User) { return $this-‐>raise(new UserDoesNotExistEvent($email)); } ! $request = Password::requestReset($user); $this-‐>passwordResetRequestRepository-‐>save($request); $this-‐>raise(new RequestIssuedEvent($request)); } }
- 53. class ResetPassword { function request(Email $email) { $user = $this-‐>userRepository-‐>findOneByEmail($email); ! if (!$user instanceof User) { return $this-‐>raise(new UserDoesNotExistEvent($email)); } ! $request = Password::requestReset($user); $this-‐>passwordResetRequestRepository-‐>save($request); $this-‐>raise(new RequestIssuedEvent($request)); } }
- 54. class ResetPassword { function request(Email $email) { $user = $this-‐>userRepository-‐>findOneByEmail($email); ! if (!$user instanceof User) { return $this-‐>raise(new UserDoesNotExistEvent($email)); } ! $request = Password::requestReset($user); $this-‐>passwordResetRequestRepository-‐>save($request); $this-‐>raise(new RequestIssuedEvent($request)); } }
- 55. Modules
- 56. . └── Shopping └── Authentication ├── InvalidPasswordResetRequest.php ├── ResetPassword.php ├── PasswordResetRequest.php └── PasswordResetRequestRepository.php
- 57. Supple Design
- 61. Create software other developers want to work with
- 63. Domain model is always in a valid state
- 64. Command Pattern
- 65. class ChangeEmailCommand { public $email; public $customerId; }
- 66. class ChangeEmailCommandHandler { private $customerRepository; ! function __construct(CustomerRepository $customerRepository) { $this-‐>customerRepository = $customerRepository; } ! public function handle(ChangeEmailCommand $command) { $customer = $this-‐>customerRepository -‐>findById($command-‐>customerId); $customer-‐>changeEmail($command-‐>email); } }
- 68. interface Specification { public function isSatisfiedBy($object); }
- 69. class PayingCustomerSpecification implements Specification { public function isSatisfiedBy($object) { return $object instanceof Customer && $object-‐>getAmountSpent() > 0.0; } }
- 70. class FreeDeliveryCalculator { private $specification; ! function __construct(Specification $specification) { $this-‐>specification = $specification; } ! public function applyDiscount(Order $order) { $customer = $this-‐>$order-‐>getCustomer(); if ($this-‐>specification-‐>isSatisfiedBy($customer)) { $order-‐>deliverForFree(); } } }
- 71. class FreeDeliveryCalculator { private $specification; ! function __construct(Specification $specification) { $this-‐>specification = $specification; } ! public function applyDiscount(Order $order) { $customer = $this-‐>$order-‐>getCustomer(); if ($this-‐>specification-‐>isSatisfiedBy($customer)) { $order-‐>deliverForFree(); } } }
- 73. Commands
- 74. Use ORM to fetch/save aggregate roots
- 75. Queries
- 76. Use specialised queries and DTO’s to fetch presentation data
- 77. DDD Summary
- 80. By speaking Ubiquitous Language
- 81. Make use of Building Blocks
- 82. By applying Object-Oriented Design
- 84. That’s the only constant!
- 85. “In order to create good software, you have to know what that software is all about.” –Eric Evans
- 86. Kacper Gunia Software Engineer Thanks! Symfony Certified Developer PHPers Silesia