我正在尝试在 Akka 中创建两个简单的 actor,一个创建一个世界(城市案例类列表)并将消息返回给 init actor。我在 Main.scala
object ActorInit {
sealed trait Command
case object Init extends Command
def apply(): Behavior[Command] = Behaviors.setup(context => new ActorInit(context))
}
class ActorInit(context: ActorContext[ActorInit.Command])
extends AbstractBehavior[ActorInit.Command](context) {
import ActorInit._
override def onMessage(msg: Command): Behavior[Command] = msg match {
case Init => {
val world = context.spawn(World(),"world")
world ! World.Create(200,200,5,this) // what do I wrap "this" in?
this
}
}
}
还有一个在World.scala
中创建我的世界的课程
object World {
sealed trait Command
case class Create(width: Int, height: Int, count: Int, replyTo: ActorRef[ActorInit]) extends Command
case class WorldMap(cities: List[City]) extends Command
def apply(): Behavior[Command] = Behaviors.setup(new World(_))
case class City(x: Int, y: Int)
}
class World(context: ActorContext[World.Command])
extends AbstractBehavior[World.Command](context) {
import World._
override def onMessage(msg: Command): Behavior[Command] = msg match {
case Create(width, height, count, replyTo) => {
replyTo ! WorldMap(generateCityList(width, height, count))
this
}
}
private def generateCityList(width: Int, height: Int, count: Int): List[City] = {
// Create city list
}
}
然后,我将在 onMessage
类的 ActorInit
方法中添加另一个案例,以侦听来自 WroldMap
演员的 World
消息。但是,当我运行它时,我收到以下错误:
[error] /home/matt/documents/small_projects/akka_TSP/src/main/scala/Main.scala:27:4
0: type mismatch;
[error] found : small.tsp.ActorInit
[error] required: akka.actor.typed.ActorRef[small.tsp.ActorInit]
[error] world ! World.Create(200,200,5,this)
[error] ^
我知道我需要对签名 T => akka.actor.typed.ActorRef[T]
做一些事情,但是我查看了文档却找不到所需的命令。我错过了什么?
答案 0 :(得分:1)
我在查看更多文档后找到了答案。我应该一直使用 context.self
。所以我的 Init
案例看起来像:
case Init => {
val world = context.spawn(World(),"world")
world ! World.Create(200,200,5,context.self)
this
}
并且我需要稍微更改 Create
案例类:
case class Create(width: Int, height: Int, count: Int, replyTo: ActorRef[ActorInit.Command]) extends Command