business-logic-entry-point-vocabulary
Business Logic Entry Point Vocabulary
Goal
Recognize the many names that software developers use in practice for business-logic entry points and treat them as synonyms for the same concept.
Developers, architects, and codebases frequently call business-logic entry points by different names depending on the tradition, framework, or architectural style they follow. These names all refer to the same idea: a function, method or class that a caller invokes to trigger business logic.
Common Names
The following terms are commonly used to refer to business-logic entry points:
- use case — from Clean Architecture and hexagonal architecture traditions
- application service — from Domain-Driven Design and layered architecture traditions
- service layer — from service-oriented and layered architecture traditions
- command handler — from CQS and CQRS traditions, for entry points that change state
- query handler — from CQS and CQRS traditions, for entry points that return data
- interactor — from Clean Architecture tradition
- facade — when used as the public interface to business operations
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