AKKA 互相调用

SpringBoot 集成 AKKA 可以参考此文：SpringBoot 集成 AKKA

场景1：bossActor 收到信息，然后发给 worker1Actor 和 worker2Actor

controller 入口，初次调用 ActorRef.noSender()

@Tag(name = "test")
@RestController
@RequestMapping("/test")
@Validated
@Inner(value = false)
public class TestController {

    @Resource
    private ActorSystem actorSystem;

    @PostMapping("/test")
    @Operation(summary = "test")
    public R search( ) {
        ActorRef pcm = actorSystem.actorOf(Props.create(BossActor.class));
        pcm.tell("I AM MASTER.TELLING BOSS", ActorRef.noSender());
        return R.ok();
    }
}

BossActor
接受 TestController 发送的信息，同时发送消息给 worker1Actor 和 worker2Actor

import akka.actor.ActorRef;
import akka.actor.Props;
import akka.actor.UntypedAbstractActor;

public class BossActor extends UntypedAbstractActor {

    private ActorRef worker1Actor;
    private ActorRef worker2Actor;

    public BossActor() {
        this.worker1Actor = this.context().actorOf(Props.create(Worker1Actor.class));
        this.worker2Actor = this.context().actorOf(Props.create(Worker2Actor.class));
    }

    @Override
    public void onReceive(Object message) {
        System.out.println("Boss 收到 master 的消息：" + message);
        worker1Actor.tell("I AM BOSS, TELLING WORKER1", self());
        worker2Actor.tell("I AM BOSS, TELLING WORKER2", self());
    }
}

Worker1Actor 和 Worker2Actor 获取 BossActor 的消息

import akka.actor.UntypedAbstractActor;

public class Worker1Actor extends UntypedAbstractActor {

    @Override
    public void onReceive(Object message) {
        System.out.println("worker1 收到 boss 消息:" + message);
    }
}

import akka.actor.UntypedAbstractActor;

public class Worker2Actor extends UntypedAbstractActor {

    @Override
    public void onReceive(Object message) {
        System.out.println("worker2 收到 boss 消息:" + message);
    }
}

打印输出

 
 
场景2：boss 发消息给 worker1，worker1 收到后发给 worker2，worker2 完成后返回 worker1，worker1再返回给 boss

分析难点：
1、由于 Actor 只能记住最后发消息给自己的人，所以 worker1 接到 worker2 消息后，getSender 只记住 worker2 ，找不到 boss 的地址
2、Actor 的 onReceive 方法接受的是消息，没有针对发送人，worker1 需要针对不同发送人 boss 和 worker2 做不同处理

针对问题2，我们可以设计一个实体 ReceiveDTO，里面包含 sender 发送人和 message 具体传参，所有消息严格实现这个类型

@Data
public class ReceiveDTO {
    String sender;
    Object message;
}

controller 入口，初次调用 ActorRef.noSender()

  @Resource
    private ActorSystem actorSystem;

    @PostMapping("/test")
    @Operation(summary = "test")
    public R search() {
        ActorRef pcm = actorSystem.actorOf(Props.create(BossActor.class));

        ReceiveDTO receiveDTO = new ReceiveDTO();
        receiveDTO.setSender("start");
        receiveDTO.setMessage("start");
        pcm.tell(receiveDTO, ActorRef.noSender());

        return R.ok();
    }

BossActor，根据 receiveDTO.getSender() 判断发送人是谁

import akka.actor.ActorRef;
import akka.actor.Props;
import akka.actor.UntypedAbstractActor;

public class BossActor extends UntypedAbstractActor {

    private ActorRef worker1Actor;

    public BossActor() {
        this.worker1Actor = this.context().actorOf(Props.create(Worker1Actor.class));
    }

    @Override
    public void onReceive(Object message) {
        ReceiveDTO receiveDTO = (ReceiveDTO) message;

        if (receiveDTO.getSender().equals("start")) {
            receiveDTO.setMessage("I AM BOSS, TELLING WORKER1");
            receiveDTO.setSender("boss");
            System.out.println("boss start");
            worker1Actor.tell(receiveDTO, self());
        }

        if (receiveDTO.getSender().equals("worker1")) {
            System.out.println("boss end 收到 worker1 消息: " + receiveDTO.getMessage());
        }
    }
}

Worker1Actor 接收 boss 信息时，同时把 boss 的 ActorRef 存到 bossActor，解决难题1

import akka.actor.ActorRef;
import akka.actor.Props;
import akka.actor.UntypedAbstractActor;

public class Worker1Actor extends UntypedAbstractActor {

    private ActorRef bossActor;
    private ActorRef worker2Actor;

    public Worker1Actor() {
        this.worker2Actor = this.context().actorOf(Props.create(Worker2Actor.class));
    }

    @Override
    public void onReceive(Object message) {

        ReceiveDTO receiveDTO = (ReceiveDTO) message;

        if (receiveDTO.getSender().equals("boss")) {
            System.out.println("worker1 收到 boss 消息: " + receiveDTO.getMessage());
            this.bossActor = getSender();
            ReceiveDTO receive1 = new ReceiveDTO();
            receive1.setMessage("I AM WORKER1, TELLING WORKER2");
            worker2Actor.tell(receive1, self());
        }

        if (receiveDTO.getSender().equals("worker2")) {
            System.out.println("worker1 收到 worker2 消息: " + receiveDTO.getMessage());
            ReceiveDTO receive1 = new ReceiveDTO();
            receive1.setMessage("I AM WORKER1, TELLING boss, job is over");
            receive1.setSender("worker1");
            bossActor.tell(receive1, self());
        }
    }
}

Worker2Actor

import akka.actor.UntypedAbstractActor;

public class Worker2Actor extends UntypedAbstractActor {

    @Override
    public void onReceive(Object message) {

        ReceiveDTO receiveDTO = (ReceiveDTO) message;
        System.out.println("worker2 收到 worker1 消息:" + receiveDTO.getMessage());

        ReceiveDTO receive1 = (ReceiveDTO) message;
        receive1.setSender("worker2");
        receive1.setMessage("I AM WORKER2, TELLING WORKER1");
        getSender().tell(receive1, self());
    }
}

打印输出