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DDD on example of Symfony (Webcamp Odessa 2014)
This document discusses Domain-Driven Design (DDD) patterns and principles using PHP and the Symfony framework as examples. It introduces key DDD concepts like the domain model, repositories, value objects, and strategies. It also outlines common layer structures and provides references to additional DDD resources.
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DDD on example of Symfony (Webcamp Odessa 2014)
- 1. DDD in PHP onexample of Symfony
- 2. cystbear Symfony expert MongoDB adept Erlangfun OSS doer KNPer https://twitter.com/1cdecoder https://github.com/cystbear http://knplabs.com/
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- 5. What this talkabout?
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- 8. No! It’s aboutidea Motivation!
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- 10. Where to storebusiness logic? Model View Controller
- 11. Where to storebusiness logic? Model View Controller
- 12. Where to storebusiness logic? Model View Controller
- 13. Where to storebusiness logic? Model View Controller -- YEAH!
- 14. Welcome to Fat StupidUgly 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/ “Inessence 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
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- 18. What is Not MVC(phew!) Request / Response Framework HTTP Framework http://fabien.potencier.org/article/49/what-is-symfony2
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- 20. Meet Doctrine http://www.doctrine-project.org/ SQL --DBAL + ORM MongoDB CouchDB OrientDB PHPCR ODM OXM
- 21. What is Inversion ofcontrol 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 itsDeps (min) set Easy to Replace Easy to Test MVC(S)!
- 23. Controller’s pray https://twitter.com/ornicar Get Request Submitform if any Call one Service method Return Response Rendering HTML far away
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- 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 writesSymfony apps#44 https://twitter.com/kriswallsmith http://www.slideshare.net/kriswallsmith/how-kris-writessymfonyapps
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- 29. Domain Logic Patterns http://martinfowler.com/books/eaa.html TransactionScript Domain Model Table Module Service Layer
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- 36. What is next? RAD DDDPatterns Examples Layers Goodies
- 37. DDD != RAD CodeFirst Do not Care about persistence (yet)
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- 40. Domain Model <?php namespace MegaCorpCoreProduct; classProduct { 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 MegaCorpCoreProduct; interface ProductRepository { publicfunction find(ProductId $productId); public function findAll(); public function add(Product $product); public function remove(Product $product); }
- 42. Value Object <?php namespace MegaCorpCore; classProductId { private $value; public function __construct($value) { $this->value = (string) $value; } public function getValue() { return $this->value; } }
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- 44. Value Object DateRange <?php publicfunction 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)
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- 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
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- 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
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- 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
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- 54. BBB DDD byEric Evans http://amzn.com/0321125215/
- 55. DDD Quickly byInfoQ http://www.infoq.com/minibooks/domain-driven-design-quickly
- 56. PoEAA by MartinFowler http://amzn.com/B008OHVDFM/
- 57. DDD and PatternsbyJimmy Nilsson http://amzn.com/B0054KOKQQ/
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