Spring 状态机：可能的事件

Question

是否可以从当前状态获取可能事件的列表？

StateMachine<State, Event> stateMachine = stateMachineService.acquireStateMachine(machineId);
stateMachine.sendEvent(event);

stateMachine.getState()  // get possible events from State

Answer 1

我找到的唯一解决方案是：

stateMachine.getTransitions().stream()
            .filter(transition -> transition.getSource().getId().equals(stateMachine.getState().getId()))
            .map(transition -> transition.getTrigger().getEvent())
            .collect(Collectors.toList());