# Domain Service

Record: `arch:domain-service`
Kind: pattern
Layer: [Domain Modeling](https://banes-lab.com/records/layer/domain-modeling.md)
Severity: contextual
Scope: domain, behavior, coordination
Canonical: https://banes-lab.com/ontology#arch-domain-service

## Repair

- Refactored by: Extract Domain Service
- Detected by: domain logic in application/transport layers
- Violated by: multi-entity domain rules living in controllers
- Measured by: misplaced domain-rule count
- Enforced by: domain model review

## requires

- [Domain Model](https://banes-lab.com/records/arch/domain-model.md)

## reinforces

- [Single Responsibility Principle (SRP)](https://banes-lab.com/records/arch/single-responsibility.md)
- [Ubiquitous Language](https://banes-lab.com/records/arch/ubiquitous-language.md)

## enables

- [Cross-Entity Domain Logic](https://banes-lab.com/records/lex/cross-entity-domain-logic.md)

## conflicts-with

- [Fat Controller](https://banes-lab.com/records/arch/fat-controller.md)
- [Transaction Script Sprawl](https://banes-lab.com/records/arch/transaction-script-sprawl.md)

## tensions-with

- [Aggregate](https://banes-lab.com/records/arch/aggregate.md)

## tensions

- [Domain Service Aggregate](https://banes-lab.com/records/tension/aggregate-domain-service.md)