Akka 2.1最小远程演员的例子

Question

编辑注意,我需要对此https://github.com/akka/akka/commit/ce014ece3568938b2036c4ccfd21b92faba69607#L13L6进行相反的更改,以使接受的答案适用于AKKA 2.1,这是在akkas主页上找到的稳定版本!

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我已经阅读了我在AKKA上找到的所有教程,但我发现的任何内容都没有"开箱即用".

使用eclipse,我想创建2个程序.

Program1:启动actor"joe"并以某种方式使它在127.0.0.1:some_port上可用

Program2:在127.0.0.1:some_port获取对actor"joe"的引用.向"joe"发送hello消息.

程序1应在收到消息时打印一些内容.我想在使用AKKA 2.1的eclipse中运行这个例子.有人可以列出2个程序(program1和program2)以及一个正在运行的application.conf文件吗？

---

编辑> 让我告诉你到目前为止我得到了什么:

演员

case class Greeting(who: String) extends Serializable

class GreetingActor extends Actor with ActorLogging {
  def receive = {
    case Greeting(who) ? println("Hello " + who);log.info("Hello " + who)
  }
}

计划1:

package test

import akka.actor.ActorSystem

object Machine1 {

  def main(args: Array[String]): Unit = {
    val system = ActorSystem("MySystem")
  }

}

程序2

package test

import akka.actor.ActorSystem
import akka.actor.Props
import akka.actor.actorRef2Scala

object Machine2 {
  def main(args: Array[String]): Unit = {
    val system = ActorSystem("MySystem")
    val greeter = system.actorOf(Props[GreetingActor], name = "greeter")
    greeter ! Greeting("Felix")
  }
}

application.conf

akka {
  actor {
    deployment {
      /greeter {
        remote = "akka://MySystem@127.0.0.1:2553"
      }
    }
  }
}

但是,当我只启动Program2并且输出时,此程序有效:

Hello Felix
[INFO] [02/18/2013 12:27:29.999] [MySystem-akka.actor.default-dispatcher-2] [akka://MySystem/user/greeter] Hello Felix

它似乎没有拿起我的application.conf.我尝试将它放在我的eclipse项目的./src/和./文件夹中.没有不同.另外,我知道这真的是降级部署,但我需要一个hello world程序才能使用AKKA.我花了很多时间在这上面而没有得到简单的工作应用程序.

Answer 1

Akka 2.2.3的更新

可以按如下方式创建最小的远程应用程序:

在Eclipse中创建2个项目:客户端和服务器

服务器:

服务器的代码是

package server

import akka.actor.Actor
import akka.actor.ActorLogging
import akka.actor.ActorSystem
import akka.actor.Props

class Joe extends Actor {
  def receive = {
    case msg: String => println("joe received " + msg + " from " + sender)
    case _ => println("Received unknown msg ")
  }
}

object Server extends App {
  val system = ActorSystem("GreetingSystem")
  val joe = system.actorOf(Props[Joe], name = "joe")
  println(joe.path)
  joe ! "local msg!"
  println("Server ready")
}

服务器的applincation.conf是

akka {
  loglevel = "DEBUG"
  actor {
     provider = "akka.remote.RemoteActorRefProvider"
  }
  remote {
     enabled-transports = ["akka.remote.netty.tcp"]
     netty.tcp {
         hostname = "127.0.0.1"
         port = 2552
     }
     log-sent-messages = on
     log-received-messages = on
  }
}

客户:

客户端代码是

package client

import akka.actor._
import akka.actor.ActorDSL._

object Greet_Sender extends App {

   println("STARTING")

   implicit val system = ActorSystem("GreetingSystem-1")

   val joe = system.actorSelection("akka.tcp://GreetingSystem@127.0.0.1:2552/user/joe")

   println("That 's Joe:" + joe)

   val a = actor(new Act {
      whenStarting { joe ! "Hello Joe from remote" }
   })

   joe ! "Hello"

   println("Client has sent Hello to joe")
}

客户端application.conf是:

akka {
  #log-config-on-start = on
  stdout-loglevel = "DEBUG"
  loglevel = "DEBUG"
  actor {
      provider = "akka.remote.RemoteActorRefProvider"
  }
  remote {
    enabled-transports = ["akka.remote.netty.tcp"]
    log-sent-messages = on
    log-received-messages = on
    netty.tcp {
          hostname = "127.0.0.1"
          port = 0
    }
  }  
}

配置必须放在两个名为application.conf的文件中,这两个文件都位于两个项目的bin目录中.

Answer 2

正如korefn所提到的,远程文档详细解释了它的工作原理.它还链接到示例应用程序.该示例应该为您提供入门所需的一切.

编辑

要使示例应用程序运行,请执行以下步骤:

从GitHub克隆

eecolor@BLACK:~/GihHub$ git clone https://github.com/akka/akka.git

进入akka目录并运行sbt

eecolor@BLACK:~/GihHub/akka$ sbt

切换到 akka-sample-project

akka > project akka-sample-remote

调用run项目并选择CalcApp

Multiple main classes detected, select one to run:

 [1] sample.remote.calculator.java.JCreationApp
 [2] sample.remote.calculator.LookupApp
 [3] sample.remote.calculator.CalcApp
 [4] sample.remote.calculator.java.JLookupApp
 [5] sample.remote.calculator.CreationApp
 [6] sample.remote.calculator.java.JCalcApp

Enter number: 3

[info] Running sample.remote.calculator.CalcApp 
[INFO] [02/19/2013 19:22:09.055] [run-main] [Remoting] Starting remoting
[INFO] [02/19/2013 19:22:09.230] [run-main] [Remoting] Remoting started; listening on addresses :[akka.tcp://CalculatorApplication@127.0.0.1:2552]
Started Calculator Application - waiting for messages

切换到另一个控制台并重复前几个步骤

eecolor@BLACK:~/GihHub/akka$ sbt
akka > project akka-sample-remote

打电话run并选择LookupApp

akka-sample-remote > run

Multiple main classes detected, select one to run:

 [1] sample.remote.calculator.java.JCreationApp
 [2] sample.remote.calculator.LookupApp
 [3] sample.remote.calculator.CalcApp
 [4] sample.remote.calculator.java.JLookupApp
 [5] sample.remote.calculator.CreationApp
 [6] sample.remote.calculator.java.JCalcApp

Enter number: 2

[info] Running sample.remote.calculator.LookupApp 
[INFO] [02/19/2013 19:23:39.358] [run-main] [Remoting] Starting remoting
[INFO] [02/19/2013 19:23:39.564] [run-main] [Remoting] Remoting started; listening on addresses :[akka.tcp://LookupApplication@127.0.0.1:2553]
Started Lookup Application
Sub result: 14 - 16 = -2
Sub result: 13 - 22 = -9
Add result: 56 + 93 = 149
Add result: 18 + 19 = 37

切换回另一个控制台,您应该看到如下内容:

Calculating 14 - 16
Calculating 13 - 22
Calculating 56 + 93
Calculating 18 + 19