Software Domain Components and Contract Boundaries
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/02 About
Model domain-owned logical components, replaceable ports and adapters, application interfaces, business invariants, state custody and negative paths.
Purpose: separate business capability, domain authority and logical application design. Reference boundaries include command acceptance, use-case coordination, core domain rules, replaceable foreign adapters, accepted events and derived query projections. Each component retains one clear set of responsibilities and an accountable data steward. Invariants: command acceptance requires attributed authorization and schema validation, and authoritative state changes remain within the owning domain. Another component cannot bypass invariants through direct shared writes. Accepted changes must have recoverable publication intent; invalid operations and ambiguous external effects require explicit rejection, reconciliation or intervention. Alternatives: these logical boundaries may be realized in one deployable application, modular monolith, several processes or distributed services. No technology stack, protocol, framework, service count or consensus mechanism is mandated. Limitations: an adopting organization must declare real domain aggregates, transaction atomicity, contract schemas, temporal ownership guarantees, recovery bounds, tests and risk evidence. An architecture diagram does not prove message atomicity or deployed correctness.
Curated · enterprise · CC-BY-4.0 · Published by Lattix · 39 elements · 66 relationships · validated on publish
/03 Contents
- Business Actor
- Business service beneficiary
- Role
- Architectural boundary owner
- Capability
- Provide governed business functionality
- Business Service
- Stakeholder business functionality
- Application
- Logical enterprise application
- Application Component
- Request acceptance adapter, Use-case coordinator, Core domain behavior boundary, External dependency adapter, External event consumer adapter, Read projection component
- Interface/Endpoint
- Inbound domain operation port, Outbound dependency port
- Application Service
- Application capability service, Replaceable external service
- Message/Event Schema
- Business command contract, Accepted domain fact contract, Derived query contract
- Logical Entity
- Authoritative domain entity, Derived query representation
- Data Domain
- Owned authoritative information domain, Externally owned information domain
- Data Store
- Logical authoritative repository, Logical read repository
- Process
- Deliver verified business functionality
- Behaviour
- Validate and authorize command, Enforce business transition invariants, Record accepted change and publication intent, Reconcile incomplete downstream effect
- State
- Accepted invariant-satisfying state, Rejected or indeterminate command outcome
- Policy
- Business command authorization policy
- Rule
- Domain state transition rules
- Requirement
- Integrity and contract quality requirement
- Constraint
- Single-owner state mutation boundary
- Control
- Contract and information integrity safeguard
- Risk
- Cross-domain coupling and integrity risk
- Measure
- Correctness and contract adherence indicators
- Outcome
- Verified beneficiary business result