What architecture is for
On This Lesson 4 topics
This lesson is planned. The outline below lists the topics it will cover. The full lesson has not been published yet.
In this lesson
explain architecture as the set of decisions that are expensive to change.
Planned topics
- Architecture is structure plus the rules about who may depend on whom.
- Its job is to keep change cheap: swap a database, a payment provider, or a framework without a rewrite.
- Drivers: team size, domain complexity, change rate, and quality needs (latency, availability).
- No style is best; each protects something and costs something.
- Shop's pain today: business rules call JPA directly, so every change touches everything.
Draft outline details
Demonstration
a dependency arrow diagram of Shop: controller → service → repository → entity, with JPA annotations everywhere.
Check your understanding
What is architecture mostly about?
Show answer
Decisions that are costly to change, and the dependency rules that keep change cheap.
Practice
Apply this lesson with the module's lab, exercises and quiz.
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