Memento Pattern

Kind: pattern

Layer: Design Patterns Core

Record: architecture:memento-pattern

Severity: contextual

Scope: behavior, state capture, history

Canonical: Ontology

A design pattern in which an object captures its own state in an opaque snapshot it can later restore.

Listed in Architecture principles, after Visitor Pattern and before Null Object Pattern.

Requires

• Encapsulation

Reinforces

• Information Hiding

Enables

• Undo/Redo
• Snapshot/Restore

Conflicts with

• External State Reach-In

In tension with

• Memory Footprint

Tensions

• Memento Pattern / Memory Footprint

Violated by

• External State Reach-In

Severity

• contextual

Category

• Behavioral Patterns

Enforced by

• rules/eslint/require-snapshot-coverage.eslint.rule.ts

Linked from

• Execution joins the halves
• Core Modular Design
• Behavioral Patterns
• Core Vocabulary
• Severity levels
• The resolutions