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


In the previous chapter, we learned some basic and advanced things about Akka fault tolerance and supervision for actors. In this chapter, we will learn how messages are routed to multiple actors via routers.

Where to use routers

In some situations, we may need a specific type of message routing mechanism for a specific requirement. Some of these situations are listed as follows:

  • We want to send messages to the actor that is less busy among other actors of the same type, that is, to the actor with lowest number of messages
  • We may want to send messages in a round-robin order to actors, that is, send messages one by one to all actors in a loop
  • We may want to send a single message to all the actors in the group
  • We may want to redistribute the work among actors automatically with the help of some mechanism

All of the following recipes are very simple:just one line of code, which specifies the type of router, does all the work.