domain driven design com functional programing(f#)
TRANSCRIPT
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De onde veio e porque voltou?
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Menos código
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Higher order function
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Pure function
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Currying
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Recursion
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Map
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List comprehension or for comprehension
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Filter
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Pattern Matching
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Fold
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Herança/Polimorfismo
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Herança
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Polimosfismo
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Principais pontos do DDD
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Alinhamento de código com Negócio
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Favorece a reutilização
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Diminui o Acoplamento
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Independência de Tecnologia
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In DDD, we don’t consider any databases.
DDD is all about the domain , not about the database, and Persistence
The domain layer is the heart of the software and this is where the interesting stuff happens
DDD não é uma bala de prata para todo o desenvolvimento do aplicativo, ele apenas ajuda a gerenciar a complexidade, quando a complexidade vem do domínio.
Eric Evans
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Tudo se resume à complexidade do comportamento em seu sistema. Se você complicada e a cada mudança de regras de negócios que envolvem a validação, cálculos, e derivações ... você vai querer um modelo de objeto.
Martin Fowler
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Layers
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User interface
Responsável por apresentar informações ao usuário e interpretar os comandos do usuário.
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Coordena a atividade de aplicativos.
Aplication layer
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Domain layer
Contém informações sobre o domínio do negócio.
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Infrastructure layer
Esta camada atua como uma biblioteca de suporte para todas as outras camadas. Ele fornece comunicação entre as camadas, implementa persistência para objetos de negócios
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Value Object != EntityVocê compra um livro para formar a biblioteca. Se você perder esse livro e comprar outro e você não se importa qual é qual, em seguida, o livro é um Value Object.
Mas se o livro que você compra é assinada pelo autor, e é muito difícil substituí-lo. Você se preocupa com esse livro específico, outra cópia simples não irá substituí-lo. Esse livro é uma Entity.
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F# / DDD
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http://www.tryfsharp.orghttp://fsharpforfunandprofit.com
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