Charla conjunta con Daniel Vaqueiro sobre los principios SOLID y live coding dónde partimos de una feature real y funcional que no sigue los principios SOLID que vamos refactorizando con SOLID en mente.

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Daniel Vaqueiro. boardfy CTO
“Programming is a social activity.”
― Robert C. Martin
https://github.com/dvaqueiro
http://boardfy.com
@chimidea

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Altia Senior Developer
Disfrutando del desarrollo web
desde 1998.
https://rolandocaldas.com
@rolando_caldas

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PHPVigo #28: Principios SOLID en la vida Real
What’s going wrong
with software?

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PHPVigo #28: Principios SOLID en la vida Real
Symptoms of Rotting Design

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PHPVigo #28: Principios SOLID en la vida Real
Solid Principles

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PHPVigo #28: Principios SOLID en la vida Real

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PHPVigo #28: Principios SOLID en la vida Real
Symptoms of Rotting Design
● Rigidity

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PHPVigo #28: Principios SOLID en la vida Real
Symptoms of Rotting Design
● Rigidity
Tendency for software to be difficult to change, even in
simple ways.

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PHPVigo #28: Principios SOLID en la vida Real
Symptoms of Rotting Design
● Rigidity
● Fragility

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PHPVigo #28: Principios SOLID en la vida Real
Symptoms of Rotting Design
● Rigidity
● Fragility
Tendency of the software to break in many places every
time it is changed.

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PHPVigo #28: Principios SOLID en la vida Real
Symptoms of Rotting Design
● Rigidity
● Fragility
● Immobility

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PHPVigo #28: Principios SOLID en la vida Real
Symptoms of Rotting Design
● Rigidity
● Fragility
● Immobility
Inability to reuse software from other projects or from parts
of the same project.

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PHPVigo #28: Principios SOLID en la vida Real
Symptoms of Rotting Design
● Rigidity
● Fragility
● Immobility
● Viscosity

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PHPVigo #28: Principios SOLID en la vida Real
Symptoms of Rotting Design
● Rigidity
● Fragility
● Immobility
● Viscosity
Viscosity of the design is high when the design preserving
methods are harder to employ than the hacks.

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PHPVigo #28: Principios SOLID en la vida Real
What
causes that rot to take
place?

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PHPVigo #28: Principios SOLID en la vida Real
What causes that rot to take place?
● Changing Requirements

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PHPVigo #28: Principios SOLID en la vida Real
What causes that rot to take place?
● Changing Requirements
● Dependency Management

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PHPVigo #28: Principios SOLID en la vida Real
SOLID Principles

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PHPVigo #28: Principios SOLID en la vida Real
SOLID Principles
● Single Responsibility Principle.
● Open Close Principle.
● Liskov Substitution Principle.
● Interface Segregation Principle.
● Dependency Inversion Principle.

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PHPVigo #28: Principios SOLID en la vida Real
Single Responsibility Principle.
A class should have only one reason to
change.

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PHPVigo #28: Principios SOLID en la vida Real
Open Close Principle.
Software entities (classes, modules, functions, etc.)
should be open for extension, but closed for
modification.

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PHPVigo #28: Principios SOLID en la vida Real
Open Close Principle.
Software entities (classes, modules, functions, etc.)
should be open for extension, but closed for
modification.
You should be able to extend a classes behavior,
without modifying it.

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PHPVigo #28: Principios SOLID en la vida Real
Liskov Substitution Principle.
Subclasses should be substitutable for
their base classes.

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PHPVigo #28: Principios SOLID en la vida Real
Interface Segregation Principle
Clients should not be forced to depend upon
interfaces that they do not use.

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PHPVigo #28: Principios SOLID en la vida Real
Interface Segregation Principle
Clients should not be forced to depend upon
interfaces that they do not use.
Many client specific interfaces are better than one
general purpose interface.

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PHPVigo #28: Principios SOLID en la vida Real
Dependency Inversion Principle
High level modules should not depend upon low
level modules. both should depend upon
abstractions.

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PHPVigo #28: Principios SOLID en la vida Real
Dependency Inversion Principle
High level modules should not depend upon low
level modules. both should depend upon
abstractions.
Abstractions should not depend upon details.
details should depend upon abstractions.

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References:
● http://staff.cs.utu.fi/staff/jouni.smed/doos_06/material/Design
PrinciplesAndPatterns.pdf
● http://butunclebob.com/ArticleS.UncleBob.PrinciplesOfOod
PHPVigo #28: Principios SOLID en la vida Real

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PHPVigo #28: Principios SOLID en la vida Real