pekko/akka-docs/java/code/docs/jrouting/FibonacciActor.java

/**
 * Copyright (C) 2009-2012 Typesafe Inc. <http://www.typesafe.com>
 */
package docs.jrouting;

import java.io.Serializable;

import akka.actor.UntypedActor;

//#fibonacciActor
public class FibonacciActor extends UntypedActor {
  public void onReceive(Object msg) {
    if (msg instanceof FibonacciNumber) {
      FibonacciNumber fibonacciNumber = (FibonacciNumber) msg;
      getSender().tell(fibonacci(fibonacciNumber.getNbr()));
    } else {
      unhandled(msg);
    }
  }

  private int fibonacci(int n) {
    return fib(n, 1, 0);
  }

  private int fib(int n, int b, int a) {
    if (n == 0)
      return a;
    // recursion
    return fib(n - 1, a + b, b);
  }

  public static class FibonacciNumber implements Serializable {
    private static final long serialVersionUID = 1L;
    private final int nbr;

    public FibonacciNumber(int nbr) {
      this.nbr = nbr;
    }

    public int getNbr() {
      return nbr;
    }

  }
}

//#fibonacciActor