akka学习教程(八) Actor中的Future-询问模式

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akka系列文章目录

akka学习教程(十四) akka分布式实战
akka学习教程(十三) akka分布式
akka学习教程(十二) Spring与Akka的集成
akka学习教程(十一) akka持久化
akka学习教程(十) agent
akka学习教程(九) STM软件事务内存
akka学习教程(八) Actor中的Future-询问模式
akka学习教程(七) 内置状态转换Procedure
akka学习教程(六) 路由器Router
akka学习教程(五) inbox消息收件箱
akka学习教程(四) actor生命周期
akka学习教程(三) 不可变对象
akka学习教程(二)HelloWord
akka学习教程(一)简介

和Java线程中的future挺像的，可以将一个actor的返回结果重定向到另一个actor中进行处理，主actor或者进程无需等待actor的返回结果。

package akka.future;import akka.actor.ActorRef;import akka.actor.ActorSystem;import akka.actor.PoisonPill;import akka.actor.Props;import akka.pattern.Patterns;import com.typesafe.config.ConfigFactory;import scala.concurrent.Await;import scala.concurrent.Future;import scala.concurrent.duration.Duration;import java.util.concurrent.TimeUnit;/** * Created by liubenlong on 2017/1/16. */public class AskMain {    public static void main(String[] args) throws Exception {        ActorSystem system = ActorSystem.create("strategy", ConfigFactory.load("akka.config"));        ActorRef printActor = system.actorOf(Props.create(PrintActor.class), "PrintActor");        ActorRef workerActor = system.actorOf(Props.create(WorkerActor.class), "WorkerActor");        //等等future返回        Future<Object> future = Patterns.ask(workerActor, 5, 1000);        int result = (int) Await.result(future, Duration.create(3, TimeUnit.SECONDS));        System.out.println("result:" + result);        //不等待返回值，直接重定向到其他actor，有返回值来的时候将会重定向到printActor        Future<Object> future1 = Patterns.ask(workerActor, 8, 1000);        Patterns.pipe(future1, system.dispatcher()).to(printActor);        workerActor.tell(PoisonPill.getInstance(), ActorRef.noSender());    }}1
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package akka.future;import akka.actor.UntypedActor;import akka.event.Logging;import akka.event.LoggingAdapter;/** * Created by liubenlong on 2017/1/12. */public class PrintActor extends UntypedActor {    private final LoggingAdapter log = Logging.getLogger(getContext().system(), this);    @Override    public void onReceive(Object o) throws Throwable {        log.info("akka.future.PrintActor.onReceive:" + o);        if (o instanceof Integer) {            log.info("print:" + o);        } else {            unhandled(o);        }    }}1
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package akka.future;import akka.actor.*;import akka.event.Logging;import akka.event.LoggingAdapter;/** * Created by liubenlong on 2017/1/12. */public class WorkerActor extends UntypedActor {    private final LoggingAdapter log = Logging.getLogger(getContext().system(), this);    @Override    public void onReceive(Object o) throws Throwable {        log.info("akka.future.WorkerActor.onReceive:" + o);        if (o instanceof Integer) {            Thread.sleep(1000);            int i = Integer.parseInt(o.toString());            getSender().tell(i*i, getSelf());        } else {            unhandled(o);        }    }}1
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输出结果：

[INFO] [01/16/2017 16:22:32.983] [strategy-akka.actor.default-dispatcher-5] [akka://strategy/user/WorkerActor] akka.future.WorkerActor.onReceive:5result:25[INFO] [01/16/2017 16:22:33.984] [strategy-akka.actor.default-dispatcher-5] [akka://strategy/user/WorkerActor] akka.future.WorkerActor.onReceive:8[INFO] [01/16/2017 16:22:34.997] [strategy-akka.actor.default-dispatcher-6] [akka://strategy/user/PrintActor] akka.future.PrintActor.onReceive:64[INFO] [01/16/2017 16:22:34.997] [strategy-akka.actor.default-dispatcher-6] [akka://strategy/user/PrintActor] print:641
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其实这里和之前的文章中那样，在workerActor执行完毕以后，向printActor发消息不也行吗？

参考资料

书籍《java高并发程序设计》
AKKA官方文档

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