Oop design magma rails 2011

Isn’t this a design patterns talk?sofftek developer

Skill traciende lenguajes

Las bases que TODOS debemos tener.

Friday, October 14, 2011

Object Oriented Design - Basics

aqui me pararia y me largaba


ME

• Emmanuel Delgado

• Ingeniero de Software para Crowd Interactive

• UAA, INEGI, Softtek

• PHP, Perl, Javascript, Java, Ruby

• Apasionadazo

• @chischaschos

Como me siento?

Con quienes he colaborado?

En que cosas te apasionas?


What makes a system complicated?code smell, you feel it

mario c nice code, shit happens eveywhere

same old problems


Rigidity

un cambio implica tocar muchos lugares


Fragility

cambio rompe lugares inesperados


Viscosity

dificil hacer la cosa correcta

de diseño

de ambiente


Immobility

duplicidad

no puedes reutilizar componentes

componentes utiles, pero separar es muy complicado


Unnecessary complexity

mas de lo que ocupas

anticipas a requerimientos

hard to understand


Unnecessary duplicity

resultado de reutilizar codigo copy paste


Opacity

la imagen es la misma

tendencia dificil de entender

codigo puede ser claro y legible

requieres esfuerzo constante para seguir siendo leguible


• Rigidity

• Fragility

• Viscosity

• Immobility

• Unnecessary duplicity and complexity

• Opacity

Rotten system usual smells

ocurren poco a poco un commit a la vez


Small components design principles

small building blocks

small shapes

Pequeñas formas -> grandes diseños

Bellos?


Single Responsibility (SR)


SR- How do I achieve it?


SR - Analyze your object

• Delegate

• Encapsulate what changes


SR - Delegate?


SR - Delegate! in ruby


SR - Delegate! with rails


SR - Encapsulate what changes

+------------------------------------+---------------+| file_path | times_changed |+------------------------------------+---------------+| lib/churn/churn_calculator.rb | 14 || README.rdoc | 7 || lib/tasks/churn_tasks.rb | 6 || Rakefile | 6 || lib/churn/git_analyzer.rb | 4 || VERSION | 4 || test/test_helper.rb | 4 || test/unit/churn_calculator_test.rb | 3 || test/churn_test.rb | 3 |+------------------------------------+---------------+

interview question

Que es encapsular, ejemplo ftp uploader

como ayuda churn, idealmente los No picos


OC - Open for extensionclosed for modification


OC - Don not reopen an object


OP - Encapsulate and extend it


OC - Composition over inheritance


OC - Composition implemented


Dependency Inversion (DI)


DI - What is a dependency?dependencia agrega responsabilidades

responsabilidad da razones para cambiar

vas a tener que hacer cambios

entre menos mejor, asi gastas mas tiempo creando codigo obra d arte


DI - Depend upon abstractions

Si tu clase emplea servicios externos, o tiene muchas librerias requeridas, o ves demasiadas constantes, utilizalas tan tarde como puedas.


Basic suggestions

• Only one responsibility per object

• Encapsulate what changes

• Depend upon abstractions

• Delegate responsibilities

• Composition over inheritance

• Extend components, do not reopen them


Afterwards common shapes will arise

patrones de diseño

alguien identifico problemas comunes

formas se repiten

evita crear patrones hasta el ultimo momento


Observer

• THINK: monitoring behavior


Observer - An observer


Observer - The observed


Strategy

• THINK: Interchangeable algorithms


Strategycomo llegas aqui? cuando un metodo ya tiene varios branchings


Strategy - Interchangeable algorithms

como llegas aqui? cuando un metodo ya tiene varios branchings


Proxy

• THINK: Wrapping object behavior, forward calls


Proxy


Template

• THINK: Predefined steps


Template- Required?


Template- Implemented


Decorator

• THINK: Present new content based on original content


Decorator - required?


Decorator - implemented


THE END


Conclusion

• Follow damn simple principles

• Do not program upon design patterns, let them arise by themselves

• Refactor to design patterns


References - 1


References - 2• CHURN: https://github.com/danmayer/churn

• http://vimeo.com/12350535

• http://vimeo.com/26330100

• http://confreaks.net/videos/257-larubyconf2009-the-building-blocks-of-modularity

• https://www.destroyallsoftware.com/screencasts


https://github.com/danmayer/churn

https://github.com/danmayer/churn

http://vimeo.com/12350535




http://confreaks.net/videos/257-larubyconf2009-the-building-blocks-of-modularity




https://www.destroyallsoftware.com/screencasts

https://www.destroyallsoftware.com/screencasts

References - 3


References - 4

pregunta para ustedes como mantienes el diseño dia tras dia?

boy scout ruletddrefactor all the fucking time


Oop design magma rails 2011

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