1.什么是Akka remoting？
Akka-Remoting一种ActorSystem之间Actor对Actor点对点的沟通协议.通过Akka-Remoting来实现一个ActorSystem中的一个Actor与另一个ActorSystem中的另一个Actor之间的沟通
Akka Remoting限制：
不支持NAT（Network Address Translation）
不支持负载均衡器（Load Balancers）
Akka提供了种方式来使用Remoting功能：
通过调用actorSelection方法搜索一个actor，该方法输入的参数的模式为：akka.<protocol>://<actor system>@<hostname>:<port>/<actor path>
通过actorOf方法创建一个actor
下面看一下Remoting系统中故障恢复模型（Failure Recovery Model），如下图所示：
上图中，连接到一个远程系统的过程中，包括上面4种状态：在进行任何通信之前，系统处于Idle状态；当第一次一个消息尝试向远程系统发送，或者当远程系统连接过来，这时系统状态变为Active；当两个系统通信失败，连接丢失，这时系统变为Gated状态；当系统通信过程中，由于参与通信的系统的状态不一致导致系统无法恢复，这时远程系统变为Quarantined状态，只有重新启动系统才能恢复，重启后系统变为Active状态。
Akka Remoting的功能
Akka将remoting完全配置化了，使用时几乎只需要修改配置文件，除非自定义，否则不需要动一行代码。 remoting包提供了两个功能：
查找一个已存在的远程Actor
在指定的远程路径上创建一个远程Actor
2.代码管理
实验目标
实现客户端和服务端双向通信
pom.xml
<?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"> <parent> <artifactId>springboot-demo</artifactId> <groupId>com.et</groupId> <version>1.0-SNAPSHOT</version> </parent> <modelVersion>4.0.0</modelVersion> <artifactId>akka</artifactId> <properties> <maven.compiler.source>8</maven.compiler.source> <maven.compiler.target>8</maven.compiler.target> </properties> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-autoconfigure</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> <dependency> <groupId>com.typesafe.akka</groupId> <artifactId>akka-actor_2.13</artifactId> <version>2.6.0</version> </dependency> <!-- Akka Streams --> <dependency> <groupId>com.typesafe.akka</groupId> <artifactId>akka-stream_2.13</artifactId> <version>2.6.0</version> </dependency> <!-- Akka Actor dependency --> <dependency> <groupId>com.typesafe.akka</groupId> <artifactId>akka-actor-typed_2.13</artifactId> <version>2.6.0</version> </dependency> <!-- Akka Remote dependency --> <dependency> <groupId>com.typesafe.akka</groupId> <artifactId>akka-remote_2.13</artifactId> <version>2.6.0</version> </dependency> <!-- Akka Cluster dependency --> <dependency> <groupId>com.typesafe.akka</groupId> <artifactId>akka-cluster-typed_2.13</artifactId> <version>2.6.0</version> </dependency> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> </dependency> </dependencies> </project>
server
server.conf（放在src/main/resources目录下）
akka {
actor {
provider = "akka.remote.RemoteActorRefProvider"
}
remote {
artery {
enabled = on
transport = tcp
canonical.hostname = "127.0.0.1"
canonical.port = 2552
}
}
}package com.et.akka.remoting;
import akka.actor.AbstractActor;
import akka.actor.ActorRef;
import akka.actor.ActorSystem;
import akka.actor.Props;
import com.typesafe.config.ConfigFactory;
public class ServerApp {
static class ServerActor extends AbstractActor {
@Override
public Receive createReceive() {
return receiveBuilder()
.match(String.class, msg -> {
System.out.println("Server received message: " + msg);
getSender().tell("Hello from Server", getSelf());
})
.build();
}
}
public static void main(String[] args) {
ActorSystem system = ActorSystem.create("RemoteSystem", ConfigFactory.load("server"));
ActorRef serverActor = system.actorOf(Props.create(ServerActor.class), "serverActor");
System.out.println("Server is running...");
}
}client
client.conf（放在src/main/resources目录下）
akka {
actor {
provider = "akka.remote.RemoteActorRefProvider"
}
remote {
artery {
enabled = on
transport = tcp
canonical.hostname = "127.0.0.1"
canonical.port = 0
}
}
}package com.et.akka.remoting;
import akka.actor.AbstractActor;
import akka.actor.ActorRef;
import akka.actor.ActorSelection;
import akka.actor.ActorSystem;
import akka.actor.Props;
import com.typesafe.config.ConfigFactory;
public class ClientApp {
static class ClientActor extends AbstractActor {
private final String serverActorPath;
public ClientActor(String serverActorPath) {
this.serverActorPath = serverActorPath;
}
@Override
public void preStart() {
ActorSelection serverActor = getContext().actorSelection(serverActorPath);
serverActor.tell("Hello from Client", getSelf());
}
@Override
public Receive createReceive() {
return receiveBuilder()
.match(String.class, msg -> {
System.out.println("Client received message: " + msg);
})
.build();
}
}
public static void main(String[] args) {
ActorSystem system = ActorSystem.create("RemoteSystem", ConfigFactory.load("client"));
String serverPath = "akka://RemoteSystem@127.0.0.1:2552/user/serverActor";
ActorRef clientActor = system.actorOf(Props.create(ClientActor.class, serverPath), "clientActor");
System.out.println("Client is running...");
}
}以上只是一些关键代码，所有代码请参见下面代码仓库
代码仓库
https://github.com/Harries/springboot-demo(akka)
3.测试
启动server
启动client
产看日志
server
Server is running... Server received message: Hello from Client
client
Client is running... Client received message: Hello from Serve
还没有评论，来说两句吧...