Book Image

Akka Cookbook

By : Vivek Mishra, Héctor Veiga Ortiz
Book Image

Akka Cookbook

By: 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
About the Authors
About the Reviewer
Customer Feedback

Understanding AllForOneStrategy for actors

In this recipe, we will learn about AllForOneStrategy for child actors.

AllForOneStrategy implies that in case of failure of any one actor under a supervisor, the strategy will be applied to all the children under supervision.

To step through this recipe, we need to import Hello-Akka project in IDE.

How to do it...

  1. Let's create a scala file, AllForOneStrategy.scala, in package com.packt.chapter2.
  2. Add the following imports to the top of the file:
          Stop, Resume, Restart} 
        import scala.concurrent.duration._ 
  1. Create messages as case classes.
        case class Add(a: Int, b: Int) 
        case class Sub(a: Int, b: Int) 
        case class Div(a: Int, b: Int) 
  1. Let's create a calculator actor as follows:
        class Calculator(printer: ActorRef) extends Actor { 
          override def preRestart(reason: Throwable,
         message: Option[Any]): Unit = {