如何使用akka fsm制作基于大小的油门？

import akka.actor.{Actor, FSM}

// 定义油门状态
sealed trait ThrottleState
case object Closed extends ThrottleState
case object Opened extends ThrottleState
case object Accelerating extends ThrottleState
case object Decelerating extends ThrottleState

// 定义外部事件
sealed trait ThrottleEvent
case object PressAccelerator extends ThrottleEvent
case object PressBrake extends ThrottleEvent

class ThrottleActor extends Actor with FSM[ThrottleState, Int] {
  startWith(Closed, 0) // 初始状态为关闭，初始速度为0

  when(Closed) {
    case Event(PressAccelerator, _) =>
      goto(Accelerating) using 1 // 切换到加速状态，设置加速度为1
  }

  when(Opened) {
    case Event(PressBrake, _) =>
      goto(Decelerating) using -1 // 切换到减速状态，设置减速度为-1
  }

  when(Accelerating) {
    case Event(PressBrake, _) =>
      goto(Decelerating) using -1 // 切换到减速状态，设置减速度为-1
  }

  when(Decelerating) {
    case Event(PressAccelerator, _) =>
      goto(Accelerating) using 1 // 切换到加速状态，设置加速度为1
  }

  onTransition {
    case Closed -> Accelerating =>
      println("Throttle is accelerating")
    case Opened -> Decelerating =>
      println("Throttle is decelerating")
  }

  initialize()

  override def receive: Receive = {
    case _ =>
  }
}

// 创建ThrottleActor并发送外部事件消息
val throttleActor = system.actorOf(Props[ThrottleActor])
throttleActor ! PressAccelerator