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Low-Level Design

Designing the objects inside a service: responsibilities, relationships, and the patterns worth knowing by name.

Low-Level Design

Decide what each class is the only thing that knows

0/21 chapters8 sections~10h

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What’s inside

01
Foundations
What low-level design actually decides, and the two ideas — responsibility and coupling — that every later section is about.
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Object-Oriented Foundations

Encapsulation, abstraction, polymorphism and composition — as tools with costs, not as a vocabulary test.

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SOLID

Five principles, each with the specific pain it removes and the specific over-application that makes it harmful.

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Design Principles

The heuristics that come up in review more often than the named patterns do.

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Patterns Worth Knowing

Creational, structural and behavioural patterns — each with the problem it solves and the situation where it is overkill.

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Design Workflow

A repeatable procedure for getting from a brief to a defensible design, and what to consider once it has to run for real.

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Concurrency in Object Design

Where shared mutable state comes from, how to remove it or guard it, and how to stop two requests from booking the same thing.

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Modelling Case Studies

Five classic briefs worked from requirements to entities, responsibilities, relationships and patterns — with the trade-offs and the extensions that would change the model.

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