Question

我有一个扩展App的对象，其中我创建了Actor系统和Actor物化器，并且还在给定的actor系统下创建了actor。

record_bytes

现在UserRoutes包含所有路由

object QuickstartServer extends App with UserRoutes {

  implicit val system: ActorSystem = ActorSystem("helloAkkaHttpServer")
  implicit val materializer: ActorMaterializer = ActorMaterializer()

  val userRegistryActor: ActorRef = system.actorOf(UserRegistryActor.props, "userRegistryActor")


   lazy val routes: Route = userRoutes
      Http().bindAndHandle(routes, "localhost", 8080)
    }

现在我的问题是Actor系统和在QuickstartServer中创建的trait UserRoutes extends JsonSupport { implicit def system: ActorSystem lazy val log = Logging(system, classOf[UserRoutes]) def userRegistryActor: ActorRef lazy val userRoutes: Route = pathPrefix("users") { concat( pathEnd { concat( get { val users: Future[Users] = (userRegistryActor ? GetUsers).mapTo[Users] //Remaining code actor如何注入到路由文件中？

您可以在此处https://developer.lightbend.com/guides/akka-http-quickstart-scala/backend-actor.html

中找到完整的代码

Answer 1

在特征的开头，您可以看到这两个声明：

  implicit def system: ActorSystem
  def userRegistryActor: ActorRef

这两个是trait中的抽象声明，这意味着trait的实现必须提供这两个。

使用以下两个声明，这就是对象中发生的事情：

 implicit val system: ActorSystem = ActorSystem("helloAkkaHttpServer")
 val userRegistryActor: ActorRef = system.actorOf(UserRegistryActor.props, "userRegistryActor")

相当一部分开发人员建议通过添加override关键字来使这种实现更加明确，例如：

 override implicit val system: ActorSystem = ActorSystem("helloAkkaHttpServer")
 override val userRegistryActor: ActorRef = system.actorOf(UserRegistryActor.props, "userRegistryActor")

Akka Http演员注入特质

1 个答案: