Product Factory

Status

Normative Business Domain Specification

Purpose

Defines creation rules for Product aggregates.

Core Principle

Factory MUST NEVER create invalid Product state.

Invariants Reference

• INV-001 Product has exactly one Canonical Product Identity
• INV-002 Identifier is evidence, not identity
• INV-003 Observation must not mutate identity
• INV-004 Variant belongs to exactly one Product

Factory Rules

Factory SHALL:

• create Product in valid initial state
• enforce invariants at creation time
• reject ambiguous identity inputs
• initialize consistency state explicitly

Factory MUST NOT:

• infer identity silently
• bypass validation rules
• depend on persistence layer
• depend on feed parsing logic
• depend on merchant logic

Output Guarantee

Factory MUST always return:

• valid Product OR
• explicit failure

Never a partially valid Product.

Decision

Factory is the only valid entry point for Product creation.