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OnionArchitecture
Ben Christel edited this page Apr 17, 2022
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The "onion architecture" is similar to what Gary Bernhardt calls a "functional core, imperative shell" architecture.
In an onion architecture, side-effecting glue code calls pure business logic and domain code.
Layers:
- Glue Procedures (e.g.
main, HTTP handlers, event handlers) - UI glue Functions (React/JSX, presenters, animations)
- Business rules
- Domain types
- Language extensions (i.e. app-agnostic utilities)
In my estimation, based on code that I've seen, app-agnostic utilities typically make up less than 5% of the codebase. Domain types and business rules, perhaps 20% each. Over half of a typical codebase might be glue code.