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De CRUD à DDD Comment Meetic a sauvé son legacy Icons made by Icongeek26, Freepik from www.flaticon.com Jean-Marie Lamodière - Backend tech lead @jmlamodiere

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Legacy Architecture n-tiers DDD + Hexagonal 2002-2012 2013 2015

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WHY ? Legacy, une fatalité ? Fait tourner la boîte Difficile à comprendre Maintenance coûteuse Icons made by Freepik from www.flaticon.com + - -

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Legacy Architecture n-tiers DDD + Hexagonal 2002-2012 2013 2015

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WHY ? Architecture n-tiers Presentation (Apps) Presentation Logique métier Données Icons made by Smashicon from www.flaticon.com

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Appli Symfony toute neuve = Legacy v2 Icons made by Freepik from www.flaticon.com

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WHY ? Framework MVC = CRUD* Icons made by Smashicon, Freepik from www.flaticon.com 3. Resource REST = entité *Create Read Update Delete *https://github.com/symfony/symfony-docs/issues/8893 Presentation Logique métier Données 2. ??? 1. Entité (getters/setters) + BDD auto-générés*

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Legacy Architecture n-tiers DDD + Hexagonal 2002-2012 2013 2015

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WHY ? Icons made by Freepik, Roundicon from www.flaticon.com Différence DDD / Hexagonal ? /Application /Command /Query /Domain /Read /Infrastructure /Symfony /Persistence

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Domain Driven Design Eric Evans - 2004

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WHY ? Domain Driven Design “Rendre le domaine explicite dans le code pour favoriser le dialogue tech/produit” Icons made by Icongeek26, Freepik from www.flaticon.com

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WHY ? Domain Driven Design Patterns stratégiques Sous domaines : ● Core ● Supporting ● Generic Bounded context Patterns Tactiques Organisation du code : ● Entity ● Value Objects ● Domain events ● ...

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WHY ? Bounded context ● “Dans le contexte culinaire : ● Dans le contexte botanique : ● Dans le contexte du : est un légume est un fruit est un feedback”

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WHY ? Ubiquitous language “Language commun tech/produit au sein d’un bounded context” Défi : le placer dans le code :) Icons made by Icongeek26 from www.flaticon.com

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Temporal coupling $member ->setStatus(‘active’) ->setActivationDate($now) ->setCanTalk(true); Icons made by Roundicons from www.flaticon.com Feature envy Anemic domain model Entité CRUD

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WHY ?Notion métier implicite $member ->setFoo()->setBar() //... // Activate the member ->setStatus(‘active’) ->setActivationDate($now) ->setCanTalk(true);

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$member ->setStatus(‘active’) ->setActivationDate($now) ->setCanTalk(true); Icons made by Roundicons from www.flaticon.com Class MyService1 Class Member $member ->setStatus(‘active’) ->setActivationDate($now) ->setCanTalk(true); Class MyService2 Feature envy

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WHY ? $member = new Member(); //... $member->getActivationDate()->format(‘Y-m-d’); Fatal error: Uncaught Error: Call to a member function format() on null Icons made by Roundicons from www.flaticon.com Temporal coupling

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WHY ? Entité DDD Rich domain model Icons made by Roundicons from www.flaticon.com $member = Member::register(/*...*/); ● Etat toujours valide ● Mutators explicites ● Emet des évènements $member->activate($now);

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Icons made by Roundicons from www.flaticon.com Primitive obsession $product ->setPriceAmount(20.50) ->setCurrenty(“EUR”); (vont ensemble)

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WHY ? Value Object DDD $price = new Price(20.50, “EUR”); $product ->setPrice($price); ● Explicite ● Immutable ● Valide

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WHY ? Value Object DDD @ Meetic $age = new Age(23); … = $age ->toSearchBirthdayMax(); ● Factorise la validation ● Factorise des fonctionnalités >= 18

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$repo->persist($member)->flush; $repo->add($member); $member = $repo->get($memberId); $repo->increaseVueCounter($memberId); Repository DDD = “collection” Intention revealing interface Icons made by Roundicons, Freepik from www.flaticon.com

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WHY ? Command Query Separation /Application /Command RegisterMember /Query GetNewMembers /Domain MemberRepositoryInterface Member Age

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Hexagonal Architecture Ports & Adapters Clean architecture ... Dr. Alistair Cockburn - 2005

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WHY ? Le découplage ? Low coupling High cohesion “Mettre ensemble ce qui a la même raison de changer.” Icons made by Roundicons from www.flaticon.com

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WHY ? Architecture Hexagonale “Découpler les décisions métier et techniques” Icons made by Roundicons from www.flaticon.com Low coupling High cohesion

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WHY ? Ex. de refactos techniques @Meetic Symfony 2 Icons made by Freepik from www.flaticon.com Symfony 4 Database Oracle Database External REST API Config files PostgreSQL

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Port & Icons made by Freepik from www.flaticon.com Pas de framework Command Query MysqlRepository HttpRepository Framework ok TestRepository RestController Test CliController Repository Framework ok Adapter

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WHY ? Infrastructure : test d’intégration Icons made by Freepik, Smashicons, Roundicons from www.flaticon.com Ex. de refactoring : QueryBuilder -> SQL pure MysqlRepository Docker mysql HttpRepository Wiremock Don’t mock what you don’t own

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WHY ? Infra complexe en n-tiers Service métier MysqlDao* HttpDao* *Data Access Object “Entity” Connait les 2 DAO Icons made by Roundicon from www.flaticon.com “Entity”

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WHY ? Infra complexe en hexagonal UseCase RepositoryInterface Entity AggregatorRepository MysqlDao* HttpDao* *Data Access Object Pas d’impact Icons made by Freepik, Roundicon from www.flaticon.com

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Icons made by Smashicon from www.flaticon.com 3. Presentation N-Tiers Hexagonal 2. Logique métier 1. Données 2. Presentation 1. Logique métier 2. Données

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WHY ? Icons made by Freepik from www.flaticon.com Arborescence Meetic /Application /Command RegisterMember /Query GetNewMembers /Domain MemberRepositoryInterface Member Age /Infrastructure /Symfony MemberController MemberSerializer /Persistence MysqlMemberRepository

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WHY ? Ou mettre mon code ? Infrastructure ● Framework (+ version) ● Libraries (Doctrine, Guzzle) ● Base De Donnée ● REST, SOAP, Ligne de cmd ? Domaine Logique métier Icons made by Icongeek26, Freepik from www.flaticon.com Product Owner Expert métier Architecte Dev, Ops

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Chemin de migration Icons made by Freepik from www.flaticon.com

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WHY ? Ne pas empiler des couches Lava flow Refacto tranche métier “verticale” Icons made by Freepik, Pixel Perfect, Roundicons from www.flaticon.com New layer Old layer 1 Old layer 2

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WHY ? Montrer l’exemple là ou c’est complexe Pas de DDD / Hexagonal si un CRUD suffit Rendre explicite une règle métier Animer des débats Pourquoi ? Fait comme ça !

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Domain Driven Design “Rendre le domaine explicite” Hexagonal Découpler les décisions métier et techniques Product Owner Expert métier Architecte Dev, Ops @jmlamodiere Icons made by Icongeek26, Freepik from www.flaticon.com Merci https://joind.in/talk/1c557