day29akka

PS:AKKA
之前要实现并发编程，通常要借用netty框架，现在如果又要高并发又要分布式就使用akka框架
这个akka在客户端和服务端每一端都相当于一个actor，尤其是服务端需要一个总管进行管理

PS: RPC
不同进程之间的的方法调用

-----------------------------实现项目

1.创建Maven项目

PS:通常编译好的话，使用插件的package命令导包，放大linux执行。

PS : Master

import akka.actor.{Actor, ActorSystem, Props}
import com.typesafe.config.ConfigFactory

import scala.collection.mutable
import scala.concurrent.duration._

class Master extends Actor{

  println("constructor invoked")

  override def preStart(): Unit = {
    println("prStart invoked")
  }

  //用于接收消息
  override def receive: Receive = {
    case "connect" =>{
      println("a client invoked")
      sender ! "reply"
    }
    case "hello" =>{
      println("hello")
    }
  }
}

object Master{
  def main(args: Array[String]){
    val host = "192.168.93.217"
    val port = 8888
    // 准备配置
    val configStr =
      s"""
         |akka.actor.provider = "akka.remote.RemoteActorRefProvider"
         |akka.remote.netty.tcp.hostname = "$host"
         |akka.remote.netty.tcp.port = "$port"
       """.stripMargin
    val config = ConfigFactory.parseString(configStr)
    //ActorSystem老大，辅助创建和监控下面的Actor，他是单例的
    val actorSystem = ActorSystem("MasterSystem", config)
    //创建Actor
    val master = actorSystem.actorOf(Props(new Master), "Master")
    master !"hello"
    actorSystem.awaitTermination()
  }
}

PS:Worker

import akka.actor.Actor
import java.util.UUID

import akka.actor.{Actor, ActorSelection, ActorSystem, Props}
import com.typesafe.config.ConfigFactory
import scala.concurrent.duration._
class Worker extends Actor{
  var master : ActorSelection = _
  //建立连接
  override def preStart(): Unit = {
    //println("prStart invoked")
    //跟Master建立连接
    master = context.actorSelection(s"akka.tcp://MasterSystem@192.168.93.217:8888/user/Master")
    //向Master发送注册消息
    master ! "connect"
  }

  //用于接收消息
  override def receive: Receive = {
    case "reply" =>{
      println("a reply from master")
    }
    /*case "hello" =>{
      println("hello")
    }*/
  }
}

object Worker{
  def main(args: Array[String]){
    val host = "192.168.93.217"
    val port = 9999  //端口要修改
    // 准备配置
    val configStr =
      s"""
         |akka.actor.provider = "akka.remote.RemoteActorRefProvider"
         |akka.remote.netty.tcp.hostname = "$host"
         |akka.remote.netty.tcp.port = "$port"
       """.stripMargin
    val config = ConfigFactory.parseString(configStr)
    //ActorSystem老大，辅助创建和监控下面的Actor，他是单例的
    val actorSystem = ActorSystem("WorkerSystem", config)
    //创建Actor
    actorSystem.actorOf(Props[Worker], "Worker")
    actorSystem.awaitTermination()
  }
}

------------------------------------------------------------------------下午没学