如何在演員範圍之外實現接收功能並將其傳遞給演員

Question

我有一個演員，可以處於多個狀態。初始狀態應該從外部傳遞：

class MyActor(openId: String, initialState: Receive) extends Actor { 

    val connected: (String) => Receive = (openId: String) => { 
    case AuthorizedOk(user) => context.become(authorized(user)) 
    ... 
    case message => unhandled(message) 
    } 

    val authorized: (IUserInfo) => Receive = (user: IUserInfo) => { 
    case SomeLogic => context.become(...) 
    case message => unhandled(message) 
    } 

    def receive: Actor.Receive = initialState 
} 

我需要設置初始狀態connected或構造authorized。當然它也可能是其他功能。但我不知道如何來實現這一目標：

new MyActor("id", ???) 

Answer 1

我看到兩種可能性

1. 有狀態傳遞給演員的開始前的生命週期方法

或

1. 有一個對象夥伴，可用於在初始化actor實例時傳遞狀態。東西的線：

   對象MyActor {

   DEF道具（初始化狀態：YourState）= Props.actorOf（新MyActor（初始化狀態））

   }

另外，初始在你的例子中的狀態不需要是部分函數。您可以將它建模爲一個案例類，然後使用context.become在各個狀態演變時移動。

編輯：添加一個例子來更清楚一點！

sealed trait State 
case object Authorized extends State 
case object UnAuthorized extends State 

class MyActor(state: State) extends Actor { 
    def receive: Receive = { 
    case state: State => 
    // do some logic 
    val newState = someLogic(state) 
    // evolve with the new state 
    context.become(active(newState)) 
    } 

    def active(newState: State): Receive = { 
    // do the pattern matching on the state and evolve 
    } 

    override def preStart(): Unit = { 
    super.preStart() 
    // send the initial state to this actor 
    self ! state 
    } 
}