DDD in PHP, on example of Symfony

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DDD in PHP on example of Symfony

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cystbear Symfony expert MongoDB adept Erlang fun OSS doer KNPer https://twitter.com/1cdecoder https://github.com/cystbear http://knplabs.com/

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Learning Pyramid

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PHP? ORLY?

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What this talk about?

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About useful tool/lib?

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About success story?

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No! It’s about idea Motivation!

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MVC

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Where to store business logic? Model View Controller

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Where to store business logic? Model View Controller

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Where to store business logic? Model View Controller

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Where to store business logic? Model View Controller -- YEAH!

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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/

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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

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Persistence Layer Model

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What is Not MVC (phew!) Request / Response Framework HTTP Framework http://fabien.potencier.org/article/49/what-is-symfony2

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What about model, persistence layer?

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Meet Doctrine http://www.doctrine-project.org/ SQL -- DBAL + ORM MongoDB CouchDB OrientDB PHPCR ODM OXM

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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

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Services http://groovy.codehaus.org/ https://grails.org/ Single Class With its Deps (min) set Easy to Replace Easy to Test MVC(S)!

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Controller’s pray https://twitter.com/ornicar Get Request Submit form if any Call one Service method Return Response Rendering HTML far away

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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

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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); // ... }

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How Kris writes Symfony apps#44 https://twitter.com/kriswallsmith http://www.slideshare.net/kriswallsmith/how-kris-writessymfonyapps

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https://twitter.com/kriswallsmith http://www.slideshare.net/kriswallsmith/how-kris-writessymfonyapps How Kris writes Symfony apps#44

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Domain Logic Patterns http://martinfowler.com/books/eaa.html

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Domain Logic Patterns http://martinfowler.com/books/eaa.html Transaction Script Domain Model Table Module Service Layer

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Transaction Script

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Domain Model

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Table Module

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Domain Logic & Application logic

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Service Layer

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What is next? RAD DDD Patterns Examples Layers Goodies

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DDD != RAD Code First Do not Care about persistence (yet)

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Domain Model Repository Value Object DTO Strategy State Patterns & Code

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Domain Model

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Domain Model id = $id; $this->name = $name; $this->recognitionStrategy = $recognitionStrategy; }

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Repository

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Value Object value = (string) $value; } public function getValue() { return $this->value; } }

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Value Object DateRange

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Value Object DateRange from = $from; $this->to = $to; } } public function findByDateRange(\DateRange $range)

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Value Object Money

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Strategy

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______ ______ _______ _______ / | / __ \ | \ | ____| | ,----'| | | | | .--. || |__ | | | | | | | | | || __| | `----.| `--' | | '--' || |____ \______| \______/ |_______/ |_______|

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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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Layers

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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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Useful goodies

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BBB DDD by Eric Evans http://amzn.com/0321125215/

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DDD Quickly by InfoQ http://www.infoq.com/minibooks/domain-driven-design-quickly

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PoEAA by Martin Fowler http://amzn.com/B008OHVDFM/

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DDD and Patterns by Jimmy Nilsson http://amzn.com/B0054KOKQQ/

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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