Book Image

Akka Cookbook

By : Piyush Mishra, Vivek Mishra, Héctor Veiga Ortiz
Book Image

Akka Cookbook

By: Piyush Mishra, Vivek Mishra, Héctor Veiga Ortiz

Overview of this book

Akka is an open source toolkit that simplifies the construction of distributed and concurrent applications on the JVM. This book will teach you how to develop reactive applications in Scala using the Akka framework. This book will show you how to build concurrent, scalable, and reactive applications in Akka. You will see how to create high performance applications, extend applications, build microservices with Lagom, and more. We will explore Akka's actor model and show you how to incorporate concurrency into your applications. The book puts a special emphasis on performance improvement and how to make an application available for users. We also make a special mention of message routing and construction. By the end of this book, you will be able to create a high-performing Scala application using the Akka framework.
Table of Contents (18 chapters)
Title Page
Credits
About the Authors
About the Reviewer
www.PacktPub.com
Customer Feedback
Preface

Creating a ScatterGatherFirstCompletedPool of actors


In this recipe, we will learn about the ScatterGatherFirstCompletedPool of actors. Eponymously it sends the same message to all the actors, waits for the actor who first completes the work, and sends a response to it. It then discards replied from the other actors.

Getting ready

  1. Create a Scala file, ScatterGatherFirstCompletedpool.scala, in the package com.packt.chapter3.
  2. Add the following imports at the top of the file:
        import akka.actor.{Actor, ActorSystem, Props} 
        import akka.pattern.ask 
        import akka.routing.ScatterGatherFirstCompletedPool 
        import akka.util.Timeout 
        import scala.concurrent.Await 
        import scala.concurrent.duration 
  1. Create an example actor as follows:
        class ScatterGatherFirstCompletedPoolActor extends Actor {  
          override def receive = {  
            case msg: String => sender ! "I say hello back to you"  
            case _ => println(s" I don't understand...