大数据学习——akka学习
2024-08-28 03:49:51
架构图
重要类介绍
ActorSystem
在Akka中，ActorSystem是一个重量级的结构，他需要分配多个线程，所以在实际应用中，ActorSystem通常是一个单例对象，我们可以使用这个ActorSystem创建很多Actor。
Actor
在Akka中，Actor负责通信，在Actor中有一些重要的生命周期方法。
1.preStart()方法：该方法在Actor对象构造方法执行后执行，整个Actor生命周期中仅执行一次。
2.receive()方法：该方法在Actor的preStart方法执行完成后执行，用于接收消息，会被反复执行。
代码
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion> <groupId>cn.itcast.akka</groupId>
<artifactId>MyRPC</artifactId>
<version>1.0</version> <properties>
<maven.compiler.source>1.7</maven.compiler.source>
<maven.compiler.target>1.7</maven.compiler.target>
<encoding>UTF-8</encoding>
<scala.version>2.10.6</scala.version>
<scala.compat.version>2.10</scala.compat.version>
</properties> <dependencies>
<dependency>
<groupId>org.scala-lang</groupId>
<artifactId>scala-library</artifactId>
<version>${scala.version}</version>
</dependency> <dependency>
<groupId>com.typesafe.akka</groupId>
<artifactId>akka-actor_2.10</artifactId>
<version>2.3.14</version>
</dependency> <dependency>
<groupId>com.typesafe.akka</groupId>
<artifactId>akka-remote_2.10</artifactId>
<version>2.3.14</version>
</dependency> </dependencies> <build>
<sourceDirectory>src/main/scala</sourceDirectory>
<testSourceDirectory>src/test/scala</testSourceDirectory>
<plugins>
<plugin>
<groupId>net.alchim31.maven</groupId>
<artifactId>scala-maven-plugin</artifactId>
<version>3.2.2</version>
<executions>
<execution>
<goals>
<goal>compile</goal>
<goal>testCompile</goal>
</goals>
<configuration>
<args>
<arg>-make:transitive</arg>
<arg>-dependencyfile</arg>
<arg>${project.build.directory}/.scala_dependencies</arg>
</args>
</configuration>
</execution>
</executions>
</plugin> <plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-shade-plugin</artifactId>
<version>2.4.3</version>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>shade</goal>
</goals>
<configuration>
<filters>
<filter>
<artifact>*:*</artifact>
<excludes>
<exclude>META-INF/*.SF</exclude>
<exclude>META-INF/*.DSA</exclude>
<exclude>META-INF/*.RSA</exclude>
</excludes>
</filter>
</filters>
<transformers>
<transformer
implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer">
<resource>reference.conf</resource>
</transformer>
<transformer
implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
<mainClass>cn.itcast.akkk.Master</mainClass>
</transformer>
</transformers>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>
package cn.itcast.akka
import akka.actor.{Actor, ActorSystem, Props}
import akka.actor.Actor.Receive
import com.typesafe.config.ConfigFactory
/**
* Created by ZhaoXing on 2016/8/18.
*/
class Master extends Actor {
override def receive: Receive = {
case "start" => {
println("starting...")
println("started")
}
case "stop" => {
println("stopping...")
println("stopped")
}
//Master接收到Worker的消息
case "connect" => {
println("a client connected...")
//向Worker反馈消息
sender ! "success"
}
case _ => println("123")
}
}
object Master {
def main(args: Array[String]) {
val host = "127.0.0.1"
val port = 8888
// val host = args(0)
// val port = args(1).toInt
val confStr =
s"""
|akka.actor.provider = "akka.remote.RemoteActorRefProvider"
|akka.remote.netty.tcp.hostname = "$host"
|akka.remote.netty.tcp.port = "$port"
""".stripMargin
val conf = ConfigFactory.parseString(confStr)
//ActorSystem是单例的，用于创建Acotor并监控actor
val actorSystem = ActorSystem("MaterActorSystem", conf)
//通过ActorSystem创建Actor
val master = actorSystem.actorOf(Props[Master], "Master")
master ! "start"
master ! "hello"
master ! "stop"
actorSystem.awaitTermination()
}
}
package cn.itcast.akka
import akka.actor.{Actor, ActorSystem, Props}
import akka.actor.Actor.Receive
import com.typesafe.config.ConfigFactory
/**
* Created by ZhaoXing on 2016/8/18.
*/
class Worker extends Actor {
//preStart在构造器之后receive之前执行
override def preStart(): Unit = {
//首先跟Master建立连接
val master = context.actorSelection("akka.tcp://MaterActorSystem@127.0.0.1:8888/user/Master")
//通过mater的引用向Master发送消息
master ! "connect"
}
override def receive: Receive = {
case "success" => {
println("a msg for master：success")
}
}
}
object Worker {
def main(args: Array[String]) {
val host = "127.0.0.1"
val port = 8889
// val host = args(0)
// val port = args(1).toInt
val confStr =
s"""
|akka.actor.provider = "akka.remote.RemoteActorRefProvider"
|akka.remote.netty.tcp.hostname = "$host"
|akka.remote.netty.tcp.port = "$port"
""".stripMargin
val conf = ConfigFactory.parseString(confStr)
//单例的ActorSystem
val actorSystem = ActorSystem("WorkerActorSystem", conf)
//通过actorSystem来创建Actor
val worker = actorSystem.actorOf(Props[Worker], "Worker")
actorSystem.awaitTermination()
}
}
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