DDD et CQRS, vers un développement orienté business 

Domain Driven Development 

Ceci est la carte du monde 

Vu par la Chine au 18ème siècle. 

Les experts du domaine 

Les experts du code 

Ubiquitous Language 

Les contextes 

Un modèle pour les gouverner tous 

SOLID 

SRP 

Single Responsibility Principle 

CQRS 

Command Query Responsibility Segregation 

"Every method should EITHER be a COMMAND that PERFORMS AN ACTION or a QUERY that RETURNS DATA to the caller, NOT BOTH." Dr. Bertrand Meyer 

"Poser une question ne devrait pas changer la réponse" 

"CQRS is simply the creation of two object where there was previously one" Greg Young 

Write Model class ArticleEntity { public integer id; public string title; public string summary; public string details; public Author author; } 

Read models class ArticleSummary { public integer id; public string summary; public string authorName; } class ArticleListItem { public integer id; public string title; } class ArticleDetails { public integer id; public string summary; public string details; public string authorName; } 

Commands class PublishArticleCommand { public integer id; public function constructor(id) { id = id; } } 

Services class ArticleService { private EntityRepository er; public function constructor(EntityRepository er) { er = er; } public function publishArticle(PublishArticleCommand c) { Article article = er.findById(c.id); article.publish(); } } 

Events class Article { public integer id; public string title; public ArticleStatus status; public function publish() { status = ArticleStatus.published; raiseEvent(new PublishedArticleEvent(id, status); } } 

Event Handler class PublishedArticleEventHandler { private Logger logger; private RedisClient redis; public function onPublishedArticle(PublishedArticleEvent $event) { logger.log('Article ' + event.id + ' has been published'); redis.add('article/' + event.id', event.status); } } 

BASE 

Basically Available Soft state Eventual consistency 

Event Sourcing 

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