domain library

Stable functional domain modeling primitives.

Exports the core Decider, Saga, and View types and their composition helpers.

Classes

Decider<C, S, E>

Decides which events should happen for a command and state.

DeciderContract<C, S, E>

Contract for computing events from commands and evolving state from events.

Saga<AR, A>

Reacts to action results by emitting follow-up actions.

SagaContract<AR, A>

Contract for reacting to action results with follow-up actions.

View<S, E>

Projects events into denormalized or query-ready state.

ViewCombineExt<S, E, SSuper, ESuper>

Combines two Views into one tuple-state View.

ViewContract<S, E>

Contract for folding events into query-side state.

Extensions

DeciderCombineExt on Decider<C, S, E>

Combine operations for Decider.

DeciderMapExt on Decider<C, S, E>

Mapping operations for Decider.

SagaCombineExt on Saga<AR?, A>

Combination operations for Saga.

SagaMapExt on Saga<AR, A>

Mapping operations for Saga.

ViewDimapOnStateExt on View<S, E>

Di-map over state for View.

ViewMapLeftOnEventExt on View<S, E>

Mapping operations for View.

Functions

saga<AR, A>(React<AR, A> react) → Saga<AR, A>

Creates a Saga from a reaction function.

Typedefs

Decide<C, S, E> = Stream<E> Function(C command, S state)

A decision function from a command and current state to emitted events.

Evolve<S, E> = S Function(S state, E event)

A state transition function from a current state and event to a new state.

React<AR, A> = Stream<A> Function(AR actionResult)

A reaction function from an action result to emitted follow-up actions.