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

Creating child actors of a parent actor

In this recipe, we will learn how to create child actors of an actor. Akka follows a tree-like hierarchy to create actors and it is also the recommended practice.

By following such practices, we can handle failures in actors as the parent can take care of it. Lets see how to do it.

Getting ready

We need to import the Hello-Akka project in the IDE of our choice. The Akka actor dependency that we added in build.sbt is sufficient for most of the recipes in this chapter, so we will skip the Getting ready section in our further recipes.

How to do it...

  1. Create a file named ParentChild.scala in package com.packt.chapter2.
  2. Add the following imports to the top of the file:
        import{ActorSystem, Props, Actor} 
  1. Create messages for sending to actors.
        case object CreateChild 
        case class Greet(msg: String) 
  1. Define a child actor as follows:
        class ChildActor extends Actor { 
          def receive = { 
            case Greet(msg) =&gt...