Facade Pattern

Kind: pattern

Layer: Design Patterns Core

Record: architecture:facade-pattern

Severity: recommended

Scope: module, subsystem, API

Canonical: Ontology

A design pattern that gives a subsystem one simple entry point, so callers do not depend on its parts.

Listed in Architecture principles, after Adapter Pattern and before Proxy Pattern.

Requires

• Subsystem Complexity

Reinforces

• Encapsulation
• Information Hiding

Enables

• Simplified Access

Conflicts with

• Leaky Subsystem API

In tension with

• Over-Centralization

Tensions

• Facade Pattern / Over-Centralization

Violated by

• Leaky Subsystem API

Severity

• recommended

Category

• Structural Patterns

Refactors

• God Object
• Boundary Leakage
• Inappropriate Intimacy
• Middle Man

Linked from

• Anti-patterns
• Core Modular Design
• Structural Patterns
• Severity levels
• The resolutions