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Blatt 02

This commit is contained in:
Christoph Stahl 2024-05-05 13:20:20 +02:00
parent 3672e114ed
commit a21a0549cd
4 changed files with 65 additions and 83 deletions
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13
src/main/java/com/example/AkkaMainSystem.java
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@ -4,6 +4,9 @@ import akka.actor.typed.ActorRef;
import akka.actor.typed.Behavior;
import akka.actor.typed.javadsl.*;
import java.util.ArrayList;
import java.util.Arrays;
public class AkkaMainSystem extends AbstractBehavior<AkkaMainSystem.Create> {
public static class Create {
@ -24,11 +27,15 @@ public class AkkaMainSystem extends AbstractBehavior<AkkaMainSystem.Create> {
private Behavior<Create> onCreate(Create command) {
//#create-actors
ActorRef<ExampleActor.Message> a = this.getContext().spawn(ExampleActor.create("Alice"), "alice");
ActorRef<ExampleTimerActor.Message> b = this.getContext().spawn(ExampleTimerActor.create(), "timeractor");
var alice = this.getContext().spawn(RelayBot.create("alice"), "alice");
var bob = this.getContext().spawn(RelayBot.create("bob"), "bob");
var charlie = this.getContext().spawn(RelayBot.create("charlie"), "charlie");
var reihenfolge = new ArrayList<>(Arrays.asList(bob, charlie, alice));
alice.tell(new RelayBot.Start(reihenfolge));
//#create-actors
a.tell(new ExampleActor.ExampleMessage(this.getContext().getSelf(),"Test123"));
return this;
}
}

35
src/main/java/com/example/ExampleActor.java
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@ -1,35 +0,0 @@
package com.example;
import akka.actor.typed.ActorRef;
import akka.actor.typed.Behavior;
import akka.actor.typed.javadsl.*;
public class ExampleActor extends AbstractBehavior<ExampleActor.Message> {
public interface Message {};
public record ExampleMessage(ActorRef<AkkaMainSystem.Create> someReference, String someString) implements Message { }
public static Behavior<Message> create(String name) {
return Behaviors.setup(context -> new ExampleActor(context, name));
}
private final String name;
private ExampleActor(ActorContext<Message> context, String name) {
super(context);
this.name = name;
}
@Override
public Receive<Message> createReceive() {
return newReceiveBuilder()
.onMessage(ExampleMessage.class, this::onExampleMessage)
.build();
}
private Behavior<Message> onExampleMessage(ExampleMessage msg) {
getContext().getLog().info("I ({}) got a message: ExampleMessage({},{})", this.name, msg.someReference, msg.someString);
return this;
}
}

45
src/main/java/com/example/ExampleTimerActor.java
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@ -1,45 +0,0 @@
package com.example;
import akka.actor.typed.javadsl.TimerScheduler;
import akka.actor.typed.Behavior;
import akka.actor.typed.javadsl.AbstractBehavior;
import akka.actor.typed.javadsl.ActorContext;
import akka.actor.typed.javadsl.Behaviors;
import akka.actor.typed.javadsl.Receive;
import java.time.Duration;
public class ExampleTimerActor extends AbstractBehavior<ExampleTimerActor.Message> {
public interface Message {};
public record ExampleMessage(String someString) implements Message { }
public static Behavior<Message> create() {
return Behaviors.setup(context -> Behaviors.withTimers(timers -> new ExampleTimerActor(context, timers)));
}
private final TimerScheduler<ExampleTimerActor.Message> timers;
private ExampleTimerActor(ActorContext<Message> context, TimerScheduler<ExampleTimerActor.Message> timers) {
super(context);
this.timers = timers;
Message msg = new ExampleMessage("test123");
this.timers.startSingleTimer(msg, msg, Duration.ofSeconds(10));
}
@Override
public Receive<Message> createReceive() {
return newReceiveBuilder()
.onMessage(ExampleMessage.class, this::onExampleMessage)
.build();
}
private Behavior<Message> onExampleMessage(ExampleMessage msg) {
getContext().getLog().info("I have send myself this message after 10 Seconds: {}", msg.someString);
return this;
}
}

55
src/main/java/com/example/RelayBot.java Normal file
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@ -0,0 +1,55 @@
package com.example;
import akka.actor.typed.ActorRef;
import akka.actor.typed.Behavior;
import akka.actor.typed.javadsl.*;
import java.util.ArrayList;
import java.util.List;
public class RelayBot extends AbstractBehavior<RelayBot.Message> {
public interface Message {};
public record Hello(List<ActorRef<RelayBot.Message>> reihenfolge, int count) implements Message { }
public record Start(List<ActorRef<Message>> reihenfolge) implements Message { }
public static Behavior<Message> create(String name) {
return Behaviors.setup(context -> new RelayBot(context, name));
}
private final String name;
private RelayBot(ActorContext<Message> context, String name) {
super(context);
this.name = name;
}
@Override
public Receive<Message> createReceive() {
return newReceiveBuilder()
.onMessage(Hello.class, this::onHello)
.onMessage(Start.class, this::onStart)
.build();
}
private Behavior<Message> onStart(Start msg) {
var next_hop = msg.reihenfolge.remove(0);
var new_reihenfolge = new ArrayList<>(msg.reihenfolge);
new_reihenfolge.add(next_hop);
next_hop.tell(new Hello(new_reihenfolge, 1));
return this;
}
private Behavior<Message> onHello(Hello msg) {
if (msg.count > 15) {
return Behaviors.stopped();
}
getContext().getLog().info("I, {}, got Hello ({})", this.name, msg.count);
var next_hop = msg.reihenfolge.remove(0);
var new_reihenfolge = new ArrayList<>(msg.reihenfolge);
new_reihenfolge.add(next_hop);
next_hop.tell(new Hello(new_reihenfolge, msg.count + 1));
return this;
}
}