Actor - Creating Actors

创建Actor - 最佳实践

import akka.actor.ActorSystem

object AkkaActor extends App {

  import DemoActor._

  println("Hello, world!")
  val system = ActorSystem("mySystem")
  val demoActor = system.actorOf(props(42), "demoActor")
  println(s"demoActor created !")
  demoActor ! 88
}

import akka.actor.{Actor, ActorLogging, Props}


object DemoActor {
  /**
    * Create Props for an actor of this type.
    *
    * @param magicNumber The magic number to be passed to this actor’s constructor.
    * @return a Props for creating this actor, which can then be further configured
    *         (e.g. calling `.withDispatcher()` on it)
    */
  def props(magicNumber: Int): Props = Props(new DemoActor(magicNumber))
}

class DemoActor(magicNumber: Int) extends Actor with ActorLogging{

  import MyActor._

  def receive = {
    case x: Int =>
      println(s"magicNumber: $magicNumber - params: $x")
      val myActor = context.actorOf(MyActor.props, "myActor")
      println(s"create myActor: ${myActor.path}")
      myActor ! Greeting("Vincent Guo")
  }
}

import akka.actor.{Actor, Props}
import akka.event.Logging

object MyActor {

  case class Greeting(from: String)

  case object Goodbye

  def props: Props = Props(new MyActor())
}

class MyActor extends Actor {
  val log = Logging(context.system, this)

  import MyActor._

  def receive = {
    case Greeting(greeter) => log.info(s"I was greeted by $greeter.")
    case Goodbye => log.info("Someone said goodbye to me.")
  }
}

创建顶级Actor val system = ActorSystem("mySystem")

• 推荐是半生对象里创建Actor(可接受参数)
• 里面还可以定义接受的事件

Output

Hello, world!
demoActor created !
magicNumber: 42 - params: 88
create myActor: akka://mySystem/user/demoActor/myActor
[INFO] [04/27/2017 18:24:20.257] [mySystem-akka.actor.default-dispatcher-2] [akka://mySystem/user/demoActor/myActor] I was greeted by Vincent Guo.