（转）akka Router实例

通常在分布式任务调度系统中会有这样的需求：一组actor提供相同的服务，我们在调用任务的时候只需要选择其中一个actor进行处理即可。 
其实这就是一个负载均衡或者说路由策略，akka作为一个高性能支持并发的actor模型，可以用来作为任务调度集群使用，当然负载均衡就是其本职工作了，akka提供了Router来进行消息的调度。

由于负载均衡原理过于简单，既不多说了，直接上代码(这里借用之前章节的InboxTest类)：

import akka.actor.*;
import akka.event.Logging;
import akka.event.LoggingAdapter;
import com.typesafe.config.ConfigFactory;
import scala.concurrent.duration.Duration;

import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;

/**
 * Created by liubenlong on 2017/1/12.
 */
public class InboxTest extends UntypedActor {

    private final LoggingAdapter log = Logging.getLogger(getContext().system(), this);

    public enum Msg{
        WORKING, DONE, CLOSE;
    }

    @Override
    public void onReceive(Object o) {
        if(o == Msg.WORKING){
            log.info("i am working.");
        }else if(o == Msg.DONE){
            log.info("i am done");
        }else if(o == Msg.CLOSE){
            log.info("i am close.");
            getSender().tell(Msg.CLOSE, getSelf());//告诉消息发送者我要关闭了。
            getContext().stop(getSelf());//关闭自己
        }else{
            unhandled(o);
        }
    }

    public static void main(String [] args){
        ActorSystem system = ActorSystem.create("inbox", ConfigFactory.load("akka.conf"));
        ActorRef inboxTest = system.actorOf(Props.create(InboxTest.class), "InboxTest");

        Inbox inbox = Inbox.create(system);
        inbox.watch(inboxTest);//监听一个actor

        //通过inbox来发送消息
        inbox.send(inboxTest, Msg.WORKING);
        inbox.send(inboxTest, Msg.DONE);
        inbox.send(inboxTest, Msg.CLOSE);

        while(true){
            try {
                Object receive = inbox.receive(Duration.create(1, TimeUnit.SECONDS));
                if(receive == Msg.CLOSE){//收到的inbox的消息
                    System.out.println("inboxTextActor is closing");
                }else if(receive instanceof  Terminated){//中断 ，和线程一个概念
                    System.out.println("inboxTextActor is closed");
                    system.shutdown();
                    break;
                }else {
                    System.out.println(receive);
                }
            } catch (TimeoutException e) {
                e.printStackTrace();
            }
        }
    }
}

import akka.actor.*;
import akka.routing.*;
import com.typesafe.config.ConfigFactory;

import java.util.ArrayList;
import java.util.concurrent.atomic.AtomicBoolean;

public class RouterTest extends UntypedActor {

    public Router router;

    {
        ArrayList<Routee> routees = new ArrayList<>();
        for(int i = 0; i < 5; i ++) {
            //借用上面的 inboxActor
            ActorRef worker = getContext().actorOf(Props.create(InboxTest.class), "worker_" + i);
            getContext().watch(worker);//监听
            routees.add(new ActorRefRoutee(worker));
        }
        /**
         * RoundRobinRoutingLogic: 轮询
         * BroadcastRoutingLogic: 广播
         * RandomRoutingLogic: 随机
         * SmallestMailboxRoutingLogic: 空闲
         */
        router = new Router(new RoundRobinRoutingLogic(), routees);
    }

    @Override
    public void onReceive(Object o) {
        if(o instanceof InboxTest.Msg){
            router.route(o, getSender());//进行路由转发
        }else if(o instanceof Terminated){
            router = router.removeRoutee(((Terminated)o).actor());//发生中断，将该actor删除。当然这里可以参考之前的actor重启策略，进行优化，为了简单，这里仅进行删除处理
            System.out.println(((Terminated)o).actor().path() + " 该actor已经删除。router.size=" + router.routees().size());

            if(router.routees().size() == 0){//没有可用actor了
                System.out.print("没有可用actor了，系统关闭。");
                flag.compareAndSet(true, false);
                getContext().system().shutdown();
            }
        }else {
            unhandled(o);
        }

    }

    public  static AtomicBoolean flag = new AtomicBoolean(true);

    public static void main(String[] args) throws InterruptedException {
        ActorSystem system = ActorSystem.create("strategy", ConfigFactory.load("akka.config"));
        ActorRef routerTest = system.actorOf(Props.create(RouterTest.class), "RouterTest");

        int i = 1;
        while(flag.get()){
            routerTest.tell(InboxTest.Msg.WORKING, ActorRef.noSender());

            if(i % 10 == 0) routerTest.tell(InboxTest.Msg.CLOSE, ActorRef.noSender());

            Thread.sleep(500);

            i ++;
        }
    }
}

akka提供了几个RoutingLogic各位可以亲自尝试运行一下，看看效果。

运行结果：

"D:\Program Files\Java\jdk1.8.0_111\bin\java" -Didea.launcher.port=7533 "-Didea.launcher.bin.path=D:\Program Files (x86)\ideaIU-2016.2.5\bin" -Dfile.encoding=UTF-8 -classpath "D:\Program Files\Java\jdk1.8.0_111\jre\lib\charsets.jar;D:\Program Files\Java\jdk1.8.0_111\jre\lib\deploy.jar;D:\Program Files\Java\jdk1.8.0_111\jre\lib\ext\access-bridge-64.jar;D:\Program Files\Java\jdk1.8.0_111\jre\lib\ext\cldrdata.jar;D:\Program Files\Java\jdk1.8.0_111\jre\lib\ext\dnsns.jar;D:\Program Files\Java\jdk1.8.0_111\jre\lib\ext\jaccess.jar;D:\Program Files\Java\jdk1.8.0_111\jre\lib\ext\jfxrt.jar;D:\Program Files\Java\jdk1.8.0_111\jre\lib\ext\localedata.jar;D:\Program Files\Java\jdk1.8.0_111\jre\lib\ext\nashorn.jar;D:\Program Files\Java\jdk1.8.0_111\jre\lib\ext\sunec.jar;D:\Program Files\Java\jdk1.8.0_111\jre\lib\ext\sunjce_provider.jar;D:\Program Files\Java\jdk1.8.0_111\jre\lib\ext\sunmscapi.jar;D:\Program Files\Java\jdk1.8.0_111\jre\lib\ext\sunpkcs11.jar;D:\Program Files\Java\jdk1.8.0_111\jre\lib\ext\zipfs.jar;D:\Program Files\Java\jdk1.8.0_111\jre\lib\javaws.jar;D:\Program Files\Java\jdk1.8.0_111\jre\lib\jce.jar;D:\Program Files\Java\jdk1.8.0_111\jre\lib\jfr.jar;D:\Program Files\Java\jdk1.8.0_111\jre\lib\jfxswt.jar;D:\Program Files\Java\jdk1.8.0_111\jre\lib\jsse.jar;D:\Program Files\Java\jdk1.8.0_111\jre\lib\management-agent.jar;D:\Program Files\Java\jdk1.8.0_111\jre\lib\plugin.jar;D:\Program Files\Java\jdk1.8.0_111\jre\lib\resources.jar;D:\Program 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\2.3.0\sisu-inject-plexus-2.3.0.jar;D:\LocalRepository\org\codehaus\plexus\plexus-component-annotations\1.5.5\plexus-component-annotations-1.5.5.jar;D:\LocalRepository\org\codehaus\plexus\plexus-classworlds\2.4\plexus-classworlds-2.4.jar;D:\LocalRepository\org\sonatype\sisu\sisu-inject-bean\2.3.0\sisu-inject-bean-2.3.0.jar;D:\LocalRepository\org\sonatype\sisu\sisu-guice\3.1.0\sisu-guice-3.1.0-no_aop.jar;D:\LocalRepository\org\sonatype\sisu\sisu-guava\0.9.9\sisu-guava-0.9.9.jar;D:\LocalRepository\org\projectlombok\lombok\1.12.2\lombok-1.12.2.jar;D:\Program Files (x86)\ideaIU-2016.2.5\lib\idea_rt.jar" com.intellij.rt.execution.application.AppMain akka.router.RouterTest
[INFO] [01/16/2017 14:46:44.010] [strategy-akka.actor.default-dispatcher-6] [akka://strategy/user/RouterTest/worker_0] i am working.
[INFO] [01/16/2017 14:46:44.481] [strategy-akka.actor.default-dispatcher-9] [akka://strategy/user/RouterTest/worker_1] i am working.
[INFO] [01/16/2017 14:46:44.981] [strategy-akka.actor.default-dispatcher-3] [akka://strategy/user/RouterTest/worker_2] i am working.
[INFO] [01/16/2017 14:46:45.481] [strategy-akka.actor.default-dispatcher-3] [akka://strategy/user/RouterTest/worker_3] i am working.
[INFO] [01/16/2017 14:46:45.981] [strategy-akka.actor.default-dispatcher-3] [akka://strategy/user/RouterTest/worker_4] i am working.
[INFO] [01/16/2017 14:46:46.514] [strategy-akka.actor.default-dispatcher-3] [akka://strategy/user/RouterTest/worker_0] i am working.
[INFO] [01/16/2017 14:46:47.021] [strategy-akka.actor.default-dispatcher-3] [akka://strategy/user/RouterTest/worker_1] i am working.
[INFO] [01/16/2017 14:46:47.492] [strategy-akka.actor.default-dispatcher-3] [akka://strategy/user/RouterTest/worker_2] i am working.
[INFO] [01/16/2017 14:46:47.992] [strategy-akka.actor.default-dispatcher-10] [akka://strategy/user/RouterTest/worker_3] i am working.
[INFO] [01/16/2017 14:46:48.492] [strategy-akka.actor.default-dispatcher-3] [akka://strategy/user/RouterTest/worker_4] i am working.
[INFO] [01/16/2017 14:46:48.492] [strategy-akka.actor.default-dispatcher-9] [akka://strategy/user/RouterTest/worker_0] i am close.
[INFO] [01/16/2017 14:46:48.502] [strategy-akka.actor.default-dispatcher-10] [akka://strategy/deadLetters] Message [akka.iInbox.InboxTest$Msg] from Actor[akka://strategy/user/RouterTest/worker_0#-492254864] to Actor[akka://strategy/deadLetters] was not delivered. [1] dead letters encountered. This logging can be turned off or adjusted with configuration settings 'akka.log-dead-letters' and 'akka.log-dead-letters-during-shutdown'.
akka://strategy/user/RouterTest/worker_0 该actor已经删除。router.size=4
[INFO] [01/16/2017 14:46:48.992] [strategy-akka.actor.default-dispatcher-9] [akka://strategy/user/RouterTest/worker_4] i am working.
[INFO] [01/16/2017 14:46:49.507] [strategy-akka.actor.default-dispatcher-9] [akka://strategy/user/RouterTest/worker_1] i am working.
[INFO] [01/16/2017 14:46:50.035] [strategy-akka.actor.default-dispatcher-7] [akka://strategy/user/RouterTest/worker_2] i am working.
[INFO] [01/16/2017 14:46:50.507] [strategy-akka.actor.default-dispatcher-9] [akka://strategy/user/RouterTest/worker_3] i am working.
[INFO] [01/16/2017 14:46:51.007] [strategy-akka.actor.default-dispatcher-7] [akka://strategy/user/RouterTest/worker_4] i am working.
[INFO] [01/16/2017 14:46:51.507] [strategy-akka.actor.default-dispatcher-9] [akka://strategy/user/RouterTest/worker_1] i am working.
[INFO] [01/16/2017 14:46:52.011] [strategy-akka.actor.default-dispatcher-3] [akka://strategy/user/RouterTest/worker_2] i am working.
[INFO] [01/16/2017 14:46:52.536] [strategy-akka.actor.default-dispatcher-7] [akka://strategy/user/RouterTest/worker_3] i am working.
[INFO] [01/16/2017 14:46:53.036] [strategy-akka.actor.default-dispatcher-9] [akka://strategy/user/RouterTest/worker_4] i am working.
akka://strategy/user/RouterTest/worker_2 该actor已经删除。router.size=3
[INFO] [01/16/2017 14:46:53.522] [strategy-akka.actor.default-dispatcher-9] [akka://strategy/user/RouterTest/worker_2] i am close.
[INFO] [01/16/2017 14:46:53.522] [strategy-akka.actor.default-dispatcher-7] [akka://strategy/user/RouterTest/worker_1] i am working.
[INFO] [01/16/2017 14:46:53.522] [strategy-akka.actor.default-dispatcher-9] [akka://strategy/deadLetters] Message [akka.iInbox.InboxTest$Msg] from Actor[akka://strategy/user/RouterTest/worker_2#519939307] to Actor[akka://strategy/deadLetters] was not delivered. [2] dead letters encountered. This logging can be turned off or adjusted with configuration settings 'akka.log-dead-letters' and 'akka.log-dead-letters-during-shutdown'.
[INFO] [01/16/2017 14:46:54.022] [strategy-akka.actor.default-dispatcher-10] [akka://strategy/user/RouterTest/worker_3] i am working.
[INFO] [01/16/2017 14:46:54.522] [strategy-akka.actor.default-dispatcher-5] [akka://strategy/user/RouterTest/worker_4] i am working.
[INFO] [01/16/2017 14:46:55.022] [strategy-akka.actor.default-dispatcher-5] [akka://strategy/user/RouterTest/worker_1] i am working.
[INFO] [01/16/2017 14:46:55.522] [strategy-akka.actor.default-dispatcher-5] [akka://strategy/user/RouterTest/worker_3] i am working.
[INFO] [01/16/2017 14:46:56.022] [strategy-akka.actor.default-dispatcher-5] [akka://strategy/user/RouterTest/worker_4] i am working.
[INFO] [01/16/2017 14:46:56.522] [strategy-akka.actor.default-dispatcher-7] [akka://strategy/user/RouterTest/worker_1] i am working.
[INFO] [01/16/2017 14:46:57.023] [strategy-akka.actor.default-dispatcher-7] [akka://strategy/user/RouterTest/worker_3] i am working.
[INFO] [01/16/2017 14:46:57.523] [strategy-akka.actor.default-dispatcher-7] [akka://strategy/user/RouterTest/worker_4] i am working.
[INFO] [01/16/2017 14:46:58.023] [strategy-akka.actor.default-dispatcher-7] [akka://strategy/user/RouterTest/worker_1] i am working.
[INFO] [01/16/2017 14:46:58.566] [strategy-akka.actor.default-dispatcher-5] [akka://strategy/user/RouterTest/worker_3] i am working.
[INFO] [01/16/2017 14:46:58.566] [strategy-akka.actor.default-dispatcher-10] [akka://strategy/user/RouterTest/worker_4] i am close.
akka://strategy/user/RouterTest/worker_4 该actor已经删除。router.size=2
[INFO] [01/16/2017 14:46:58.566] [strategy-akka.actor.default-dispatcher-10] [akka://strategy/deadLetters] Message [akka.iInbox.InboxTest$Msg] from Actor[akka://strategy/user/RouterTest/worker_4#50964955] to Actor[akka://strategy/deadLetters] was not delivered. [3] dead letters encountered. This logging can be turned off or adjusted with configuration settings 'akka.log-dead-letters' and 'akka.log-dead-letters-during-shutdown'.
[INFO] [01/16/2017 14:46:59.076] [strategy-akka.actor.default-dispatcher-4] [akka://strategy/user/RouterTest/worker_3] i am working.
[INFO] [01/16/2017 14:46:59.547] [strategy-akka.actor.default-dispatcher-3] [akka://strategy/user/RouterTest/worker_1] i am working.
[INFO] [01/16/2017 14:47:00.047] [strategy-akka.actor.default-dispatcher-4] [akka://strategy/user/RouterTest/worker_3] i am working.
[INFO] [01/16/2017 14:47:00.547] [strategy-akka.actor.default-dispatcher-4] [akka://strategy/user/RouterTest/worker_1] i am working.
[INFO] [01/16/2017 14:47:01.047] [strategy-akka.actor.default-dispatcher-5] [akka://strategy/user/RouterTest/worker_3] i am working.
[INFO] [01/16/2017 14:47:01.582] [strategy-akka.actor.default-dispatcher-3] [akka://strategy/user/RouterTest/worker_1] i am working.
[INFO] [01/16/2017 14:47:02.091] [strategy-akka.actor.default-dispatcher-5] [akka://strategy/user/RouterTest/worker_3] i am working.
[INFO] [01/16/2017 14:47:02.562] [strategy-akka.actor.default-dispatcher-5] [akka://strategy/user/RouterTest/worker_1] i am working.
[INFO] [01/16/2017 14:47:03.062] [strategy-akka.actor.default-dispatcher-5] [akka://strategy/user/RouterTest/worker_3] i am working.
akka://strategy/user/RouterTest/worker_3 该actor已经删除。router.size=1
[INFO] [01/16/2017 14:47:03.562] [strategy-akka.actor.default-dispatcher-3] [akka://strategy/user/RouterTest/worker_1] i am working.
[INFO] [01/16/2017 14:47:03.562] [strategy-akka.actor.default-dispatcher-3] [akka://strategy/user/RouterTest/worker_3] i am close.
[INFO] [01/16/2017 14:47:03.563] [strategy-akka.actor.default-dispatcher-3] [akka://strategy/deadLetters] Message [akka.iInbox.InboxTest$Msg] from Actor[akka://strategy/user/RouterTest/worker_3#-667250877] to Actor[akka://strategy/deadLetters] was not delivered. [4] dead letters encountered. This logging can be turned off or adjusted with configuration settings 'akka.log-dead-letters' and 'akka.log-dead-letters-during-shutdown'.
[INFO] [01/16/2017 14:47:04.062] [strategy-akka.actor.default-dispatcher-10] [akka://strategy/user/RouterTest/worker_1] i am working.
[INFO] [01/16/2017 14:47:04.597] [strategy-akka.actor.default-dispatcher-10] [akka://strategy/user/RouterTest/worker_1] i am working.
[INFO] [01/16/2017 14:47:05.099] [strategy-akka.actor.default-dispatcher-4] [akka://strategy/user/RouterTest/worker_1] i am working.
[INFO] [01/16/2017 14:47:05.570] [strategy-akka.actor.default-dispatcher-4] [akka://strategy/user/RouterTest/worker_1] i am working.
[INFO] [01/16/2017 14:47:06.070] [strategy-akka.actor.default-dispatcher-4] [akka://strategy/user/RouterTest/worker_1] i am working.
[INFO] [01/16/2017 14:47:06.570] [strategy-akka.actor.default-dispatcher-5] [akka://strategy/user/RouterTest/worker_1] i am working.
[INFO] [01/16/2017 14:47:07.070] [strategy-akka.actor.default-dispatcher-5] [akka://strategy/user/RouterTest/worker_1] i am working.
[INFO] [01/16/2017 14:47:07.611] [strategy-akka.actor.default-dispatcher-5] [akka://strategy/user/RouterTest/worker_1] i am working.
[INFO] [01/16/2017 14:47:08.112] [strategy-akka.actor.default-dispatcher-4] [akka://strategy/user/RouterTest/worker_1] i am working.
[INFO] [01/16/2017 14:47:08.583] [strategy-akka.actor.default-dispatcher-5] [akka://strategy/user/RouterTest/worker_1] i am working.
[INFO] [01/16/2017 14:47:08.583] [strategy-akka.actor.default-dispatcher-5] [akka://strategy/user/RouterTest/worker_1] i am close.
[INFO] [01/16/2017 14:47:08.585] [strategy-akka.actor.default-dispatcher-9] [akka://strategy/deadLetters] Message [akka.iInbox.InboxTest$Msg] from Actor[akka://strategy/user/RouterTest/worker_1#255839262] to Actor[akka://strategy/deadLetters] was not delivered. [5] dead letters encountered. This logging can be turned off or adjusted with configuration settings 'akka.log-dead-letters' and 'akka.log-dead-letters-during-shutdown'.
akka://strategy/user/RouterTest/worker_1 该actor已经删除。router.size=0
没有可用actor了，系统关闭。
Process finished with exit code 0

原文地址：http://blog.csdn.net/liubenlong007/article/details/54574064