DDD in PHP, on example of Symfony

Introduction to DDD on example of Symfony

Transcript

1. DDD in PHP on example of Symfony
2. cystbear Symfony expert MongoDB adept Erlang fun OSS doer KNPer https://twitter.com/1cdecoder https://github.com/cystbear http://knplabs.com/
3. Learning Pyramid
4. PHP? ORLY?
5. What this talk about?
6. About useful tool/lib?
7. About success story?
8. No! It’s about idea Motivation!
9. MVC
10. Where to store business logic? Model View Controller
11. Where to store business logic? Model View Controller
12. Where to store business logic? Model View Controller
13. Where to store business logic? Model View Controller -- YEAH!
14. Welcome to Fat Stupid Ugly Controllers FSUC/FUC http://blog.astrumfutura.com/2008/12/the-m-in-mvc-why-models-are-misunderstood-and-unappreciated/ http://zendframework.ru/anonses/model-with-mvc http://habrahabr.ru/post/175465/
15. Anemic (Domain) Model http://www.martinfowler.com/bliki/AnemicDomainModel.html http://habrahabr.ru/post/224879/ “In essence the problem with anemic domain models is that they incur all of the costs of a domain model, without yielding any of the benefits.” Martin Fowler
16. Persistence Layer Model
18. What is Not MVC (phew!) Request / Response Framework HTTP Framework http://fabien.potencier.org/article/49/what-is-symfony2
19. What about model, persistence layer?
20. Meet Doctrine http://www.doctrine-project.org/ SQL -- DBAL + ORM MongoDB CouchDB OrientDB PHPCR ODM OXM
21. What is Inversion of control Service Locator Dependency Injection Container http://www.martinfowler.com/articles/injection.html http://fabien.potencier.org/article/11/what-is-dependency-injection
22. Services http://groovy.codehaus.org/ https://grails.org/ Single Class With its Deps (min) set Easy to Replace Easy to Test MVC(S)!
23. Controller’s pray https://twitter.com/ornicar Get Request Submit form if any Call one Service method Return Response Rendering HTML far away
24. Managers Managers Managers http://blog.codinghorror.com/i-shall-call-it-somethingmanager/ http://stackoverflow.com/questions/1866794/naming-classes-how-to- avoid-calling-everything-a-whatevermanager <SmtManager> <WhatEverManager> <MyManager> <EtcManager>
25. Real Pain class BackendUserProgramsPossessionFormHandler { protected $dep1; // deps holder props public function __construct(DepsClass $dep1 /*, ...*/) { $this->dep1 = $dep1; } public function process(Form $form) { $this->dep1->makeHappy($form); // ... }
26. How Kris writes Symfony apps#44 https://twitter.com/kriswallsmith http://www.slideshare.net/kriswallsmith/how-kris-writessymfonyapps
27. https://twitter.com/kriswallsmith http://www.slideshare.net/kriswallsmith/how-kris-writessymfonyapps How Kris writes Symfony apps#44
28. Domain Logic Patterns http://martinfowler.com/books/eaa.html
29. Domain Logic Patterns http://martinfowler.com/books/eaa.html Transaction Script Domain Model Table Module Service Layer
30. Transaction Script
31. Domain Model
32. Table Module
33. Domain Logic & Application logic
34. Service Layer
36. What is next? RAD DDD Patterns Examples Layers Goodies
37. DDD != RAD Code First Do not Care about persistence (yet)
38. Domain Model Repository Value Object DTO Strategy State Patterns & Code
39. Domain Model
40. Domain Model <?php namespace MegaCorp\Core\Product; class Product { private $id; private $name; private $recognitionStrategy; public function __construct( ProductId $id, $name, $recognitionStrategy ) { $this->id = $id; $this->name = $name; $this->recognitionStrategy = $recognitionStrategy; }
41. Repository <?php namespace MegaCorp\Core\Product; interface ProductRepository { public function find(ProductId $productId); public function findAll(); public function add(Product $product); public function remove(Product $product); }
42. Value Object <?php namespace MegaCorp\Core; class ProductId { private $value; public function __construct($value) { $this->value = (string) $value; } public function getValue() { return $this->value; } }
43. Value Object DateRange
44. Value Object DateRange <?php public function findByDateRange( \DateTime $from, \DateTime $to ) class DateRange { private $from; private $to; public function __construct(\DateTime $from, \DateTime $to) { $this->from = $from; $this->to = $to; } } public function findByDateRange(\DateRange $range)
45. Value Object Money
46. <?php class Money { private $amount; private $currency; public function __construct($amount, Currency $currency) { // ... } } Value Object Money
47. <?php class ProfileData { public $firstName; public $lastName; public $birthday; } DTO
48. Strategy
49. ______ ______ _______ _______ / | / __ \ | \ | ____| | ,----'| | | | | .--. || |__ | | | | | | | | | || __| | `----.| `--' | | '--' || |____ \______| \______/ |_______/ |_______|
50. src └── MegaCorp ├── ApiBundle │ ├── Controller │ │ └── ... │ └── MegaCorpApiBundle.php ├── Core │ └── Product │ ├── Product.php │ ├── ProductId.php │ └── ProductRepository.php └── CoreBundle ├── Controller │ └── ... ├── Repository │ ├── InMemoryProductRepository.php │ └── MongoDbProductRepository.php └── MegaCorpCoreBundle.php Directory structure
51. Layers
52. Layers Domain Layer -- heart of your application, Entities and Repositories Application Layer -- Controllers Presentation Layer -- Templates / DTOs for serializer Infrastructure Layer -- framework, persistence, concrete implementations of Domain Layer
53. Useful goodies
54. BBB DDD by Eric Evans http://amzn.com/0321125215/
55. DDD Quickly by InfoQ http://www.infoq.com/minibooks/domain-driven-design-quickly
56. PoEAA by Martin Fowler http://amzn.com/B008OHVDFM/
57. DDD and Patterns by Jimmy Nilsson http://amzn.com/B0054KOKQQ/
58. Links http://dddcommunity.org/ http://williamdurand.fr/ http://welcometothebundle.com/ http://verraes.net/ http://jimmynilsson.com/blog/ http://www.martinfowler.com/ http://elephantintheroom.io/ -- podcast http://msdn.microsoft.com/en-us/magazine/dd419654.aspx http://www.martinfowler.com/bliki/AnemicDomainModel.html http://martinfowler.com/bliki/CQRS.html
60. https://joind.in/11576 Thanks!