StableArquitecturasolid

SOLID Principles

Operationalizes the five SOLID class/module design principles — Single Responsibility, Open/Closed, Liskov Substitution, Interface Segregation, Dependency Inversion — as concrete checks, with explicit guidance on when applying them adds value vs. adds ceremony.

solidoopcouplingcohesiondependency-inversionclass-design

Principios

· Aplica los principios documentados en el pack solid.

Patrones

· The "and" test (SRP): describe the class in one sentence; if it needs "and" ("handles order validation *and* sends emails"), split it.
· The edit-existing test (OCP): adding a new case requires editing an existing tested switch/if chain → candidate for polymorphism, but only after the second or third case appears, not preemptively for the first.
· The "throws NotSupported" smell (LSP): a subclass overriding a method to throw or no-op signals the hierarchy models the wrong relationship.
· The unused-methods test (ISP): if a class implementing an interface stubs out half its methods, the interface is fat — split by actual client need.
· The "new" grep (DIP): business logic instantiating concrete infra classes directly (new SqlClient() inside a use case) is an inversion violation; check whether an interface already exists nearby before adding one.

Riesgos

· Ver anti-patrones específicos del dominio en el pack.

Checklist

[ ] No class edited by unrelated stakeholders for unrelated reasons without cause to split. (SD1)
[ ] Adding a variant to existing multi-case behavior doesn't require editing tested existing cases. (SD2)
[ ] No subclass overrides throw/no-op to narrow a contract. (SD3)
[ ] Business logic depends on interfaces, not concrete infra classes, wherever a second implementation exists or tests need isolation. (SD5)
[ ] Interfaces sized to actual client usage — no stub implementations. (SD4)
[ ] No interface/strategy pattern introduced for a single stable case. (SD6)

Fuentes

Agile Software Development, Principles, Patterns, and Practices

En la bibliografía AKOS

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