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Princípios de design de so ware orientado-a-objetos
DESIGNDESIGN
O que é um bom design?
Abstração
Encapsulamento
Reuso
ACEITAR MUDANÇASACEITAR MUDANÇAS
DESIGN DE LONDRESDESIGN DE LONDRES
Christopher Wren
DESIGN DE LONDRESDESIGN DE LONDRES
John Evelyn
DESIGN DE LONDRESDESIGN DE LONDRES
Robert Hooke
QUAL FOI OQUAL FOI O
DESIGNDESIGN
ESCOLHIDO?ESCOLHIDO?
NENHUM!NENHUM!
RECONSTRUÍDARECONSTRUÍDA
INCREMENTALMENTEINCREMENTALMENTE
PRIMEIRO PROJETO ÁGILPRIMEIRO PROJETO ÁGIL
Evolução incremental do design
Design feito para o código atual
Design não é uma etapa, é um processo contínuo
Poor dependency managment leads to
code that is hard to change, fragile, and
non-reusable.
Carro pode chamar métodos em objetos de Motor
Carro herda de Veiculo
Carro depende da implementação de
Veiculo
Design smells
Rigidez — Difícil de alterar
Fragilidade — Fácil de quebrar
Imobilidade — Difícil reuso
Viscosidade — Difícil de fazer certo
Complexidade desnecessária — Overdesign
Repetição desnecessária — Non-DRY
Opacidade — Expressividade desorganizada
Uma classe deveria ter apenas um motivo para ser alterada
Entidades de so ware (classes, módulos, funções, etc)
deveriam ser abertos para extensão porém fechado para
modificação
Subtipos devem ser substitutos para os seus tipos base
Design by Contract
Clientes não deveriam ser forçados a depender de métodos
que eles não usam
Abstrações não deveriam depender de detalhes.
Detalhes deveriam depender apenas de abstrações
S ingle-Responsibility Principle
O pen/Closed Principle
L iskov Substitution Principle
I nterface Segregation Principle
D ependency inversion Principle
Daniel Teixeira — Caiena So ware
OBRIGADO!OBRIGADO!

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OO design principles