@startuml

abstract class StateMachineManager<E extends StateMachineEvent, S extends StateMachineState> {
  + states: async* S
  - machines: [StateMachine<E, S>]
  - queue: Queue<E>
  --
  + accept(E event): void => queue.add(event);
  - dispatch(E event): void => machines[E].accept(event);
  --
  + {method} << public API methods >>
}

@enduml