Layered Architecture

Kind: style

Layer: Structural Core

Aliases: N-Tier Architecture

Record: architecture:layered-architecture

Severity: contextual

Scope: application, system

Canonical: Ontology

A convention of stacking presentation, application and persistence layers, each calling only the layer below it.

Listed in Architecture principles, after Clean Architecture and before Component-Based Architecture.

Requires

• Layer Separation

Reinforces

• Separation of Concerns

Enables

• Structured Code Organization

Conflicts with

• Layer Skipping

In tension with

• Anemic Layers

Tensions

• Layered Architecture / Anemic Layers

Violated by

• Layer Skipping

Refactored by

• Move Behavior to Its Owner
• Introduce Port

Severity

• contextual

Category

• Codebase / System Architecture Styles

Enforced by

• rules/eslint/closure-no-cross-subsystem-import.eslint.rule.ts
• rules/eslint/closure-no-type-layer-drift.eslint.rule.ts
• rules/eslint/closure-no-undeclared-type-layer.eslint.rule.ts

Linked from

• The layer spine
• The direction axis
• Core Modular Design
• Codebase / System Architecture Styles
• Core Modular Design
• Severity levels
• The resolutions