From 6f2af5f48144ddac4365fa8767941f150e94dc85 Mon Sep 17 00:00:00 2001
From: Christoph Stahl <christoph.stahl@tu-dortmund.de>
Date: Wed, 10 May 2023 16:36:43 +0200
Subject: [PATCH] Fibonacci

---
 src/main/java/com/example/AkkaMainSystem.java |  5 +-
 src/main/java/com/example/C.java              | 30 ++++++++++++
 src/main/java/com/example/ExampleActor.java   | 35 --------------
 src/main/java/com/example/Fib.java            | 41 ++++++++++++++++
 src/main/java/com/example/FibCont.java        | 48 +++++++++++++++++++
 5 files changed, 122 insertions(+), 37 deletions(-)
 create mode 100644 src/main/java/com/example/C.java
 delete mode 100644 src/main/java/com/example/ExampleActor.java
 create mode 100644 src/main/java/com/example/Fib.java
 create mode 100644 src/main/java/com/example/FibCont.java

diff --git a/src/main/java/com/example/AkkaMainSystem.java b/src/main/java/com/example/AkkaMainSystem.java
index 7ddda70..9b2ba93 100644
--- a/src/main/java/com/example/AkkaMainSystem.java
+++ b/src/main/java/com/example/AkkaMainSystem.java
@@ -24,10 +24,11 @@ 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<FibCont.Message> c = this.getContext().spawn(C.create(), "c");
+        ActorRef<Fib.Message> fib = this.getContext().spawn(Fib.create(), "fib");
         //#create-actors
 
-        a.tell(new ExampleActor.ExampleMessage(this.getContext().getSelf(),"Test123"));
+        fib.tell(new Fib.FibMessage(7, c));
         return this;
     }
 }
diff --git a/src/main/java/com/example/C.java b/src/main/java/com/example/C.java
new file mode 100644
index 0000000..2ef0199
--- /dev/null
+++ b/src/main/java/com/example/C.java
@@ -0,0 +1,30 @@
+package com.example;
+
+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;
+
+public class C extends AbstractBehavior<FibCont.Message> {
+    public static Behavior<FibCont.Message> create() {
+        return Behaviors.setup(C::new);
+    }
+
+
+    private C(ActorContext<FibCont.Message> context) {
+        super(context);
+    }
+
+    @Override
+    public Receive<FibCont.Message> createReceive() {
+        return newReceiveBuilder()
+                .onMessage(FibCont.FibContMessage.class, this::onFibContMessage)
+                .build();
+    }
+
+    private Behavior<FibCont.Message> onFibContMessage(FibCont.FibContMessage msg) {
+        getContext().getLog().info("{}", msg.n());
+        return this;
+    }
+}
diff --git a/src/main/java/com/example/ExampleActor.java b/src/main/java/com/example/ExampleActor.java
deleted file mode 100644
index cf56713..0000000
--- a/src/main/java/com/example/ExampleActor.java
+++ /dev/null
@@ -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;
-    }
-}
diff --git a/src/main/java/com/example/Fib.java b/src/main/java/com/example/Fib.java
new file mode 100644
index 0000000..91a7607
--- /dev/null
+++ b/src/main/java/com/example/Fib.java
@@ -0,0 +1,41 @@
+package com.example;
+
+import akka.actor.typed.ActorRef;
+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;
+
+public class Fib extends AbstractBehavior<Fib.Message> {
+
+    public interface Message {};
+
+    public record FibMessage(int n, ActorRef<FibCont.Message> cust) implements Message {  }
+
+    public static Behavior<Message> create() {
+        return Behaviors.setup(Fib::new);
+    }
+
+    private Fib(ActorContext<Message> context) {
+        super(context);
+    }
+
+    @Override
+    public Receive<Message> createReceive() {
+        return newReceiveBuilder()
+                .onMessage(FibMessage.class, this::onFibMessage)
+                .build();
+    }
+
+    private Behavior<Message> onFibMessage(FibMessage msg) {
+        if(msg.n <= 1) {
+            msg.cust.tell(new FibCont.FibContMessage(msg.n));
+        } else {
+            ActorRef<FibCont.Message> cont = this.getContext().spawnAnonymous(FibCont.create(msg.cust));
+            this.getContext().getSelf().tell(new FibMessage(msg.n - 1, cont));
+            this.getContext().getSelf().tell(new FibMessage(msg.n - 2, cont));
+        }
+        return this;
+    }
+}
diff --git a/src/main/java/com/example/FibCont.java b/src/main/java/com/example/FibCont.java
new file mode 100644
index 0000000..0d11063
--- /dev/null
+++ b/src/main/java/com/example/FibCont.java
@@ -0,0 +1,48 @@
+package com.example;
+
+import akka.actor.typed.ActorRef;
+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;
+
+public class FibCont extends AbstractBehavior<FibCont.Message> {
+
+    private boolean flag;
+    private int store;
+
+    public interface Message {};
+
+    public record FibContMessage(int n) implements Message {  }
+
+    public static Behavior<Message> create(ActorRef<Message> cust) {
+        return Behaviors.setup(context -> new FibCont(context, cust));
+    }
+
+    private final ActorRef<Message> cust;
+
+    private FibCont(ActorContext<Message> context, ActorRef<Message> cust) {
+        super(context);
+        this.cust = cust;
+        this.flag = false;
+        this.store = 0;
+    }
+
+    @Override
+    public Receive<Message> createReceive() {
+        return newReceiveBuilder()
+                .onMessage(FibContMessage.class, this::onFibContMessage)
+                .build();
+    }
+
+    private Behavior<Message> onFibContMessage(FibContMessage msg) {
+        if (this.flag) {
+            this.cust.tell(new FibContMessage(this.store + msg.n));
+        } else {
+            this.flag = true;
+            this.store = msg.n;
+        }
+        return this;
+    }
+}