@startuml

abstract class StateMachine<E extends StateMachineEvent, S extends StateMachineState> {
  + states: async* S
  - manager: StateMachineManager<E, S>
  - queue: Queue<E>
  + accept(E event): void => queue.add(event);
  - dispatch(E event): void => manager.dispatch(event);
  - emit(S state): void => states.add(state);
}

@enduml