向前和告诉阿卡演员之间的区别

告诉和转发有什么区别，如果我会发送相同的消息：

case msg: Message => otherActor tell (msg,sender) 

和

 case msg: Message => otherActor forward msg 

Answer 1

sender()在接收端会有所不同。

消息使用tell （也称为! ）发送：

A 告诉消息M到B
B这个消息告诉 C
C认为消息M的sender()是B

消息使用正向发送：

A 告诉消息M到B
B将该消息转发给C
C认为消息M的sender()是A

值得指出的是，使用tell明确设置消息的发送者时，您可以实现与forward一样的function，但这不是典型的Akka风格：

 // inside `B`, when received `msg` from `A` C tell (msg, A) == C forward msg 

欲了解更多信息，请参阅关于转发的文档 。

Answer 2

Tell将发送者设置为发送消息的演员。

转发保留消息的原始发件人。

Answer 3

target.tell（message，getSelf（））; final Object result =“”; target.forward（result，getContext（））;

在这里，getself（）是演员的自我引用。 getcontext（）是主pipe参考。

Answer 4

 import akka.actor.{Actor, ActorSystem, Props} case object FromActor3 /** * forward method: Forwards the message and passes the original sender actor as the sender. */ object ActorForward extends App { class ActorExample extends Actor { def receive = { case message: String => println(s"Message received from ${sender.path.name}, message = $message") val child = context.actorOf(Props[Actor2], "ChildActor") child ! message case FromActor3 => println("Response when forwarded by Actor2 to Actor3") } } class Actor2 extends Actor { def receive = { case message: String => println(s"Message received from ${sender.path.name}, message = $message") val child = context.actorOf(Props[Actor3], "ChildActor") println("forwarding...") child forward message case _ => println("Unknown message") } } class Actor3 extends Actor { def receive = { case message: String => println(s"Message received from ${sender.path.name}, message = $message") sender ! FromActor3 case _ => println("Unknown message") } } val actorSystem = ActorSystem("ActorSystem") val actor = actorSystem.actorOf(Props[ActorExample], "RootActor") actor ! "Hello" }