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

Monitoring an actor life cycle using DeathWatch

In some scenarios, it becomes necessary to check continuously whether a particular service is running or not. In this recipe, we will learn how to monitor an actor.

To step through this recipe, you need to import the Hello-Akka project.

How to do it...

  1. Let's create a file, DeathWatch.scala, in package com.packt.chapter2.
  2. Add the following imports to the top of the file:
        import{Actor, ActorSystem, Props,
  1. Create the following case objects as messages:
        case object Service 
        case object Kill 
  1. Define a service actor, which would be monitored.
        class ServiceActor extends Actor { 
          def receive = { 
            case Service => println("I provide a special service") 
  1. Create an actor, which would be creating ServiceActor as its child.
        class DeathWatchActor extends Actor { 
          val child = context.actorOf(Props[ServiceActor],