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

Using for-comprehensions for futures

In this small recipe, we will see how to use for comprehensions to iterate over futures as we do with Scala collections. As a future is a monad, like a list in Scala, we can operate on it in the same way as we operate on a list. It is also a way of composing futures.

Getting ready

All the prerequisites are the same as before; just import the Hello-Akka project in the IDE.

How to do it...

  1. Create a Scala file, ForComprehensions.scala, in the com.packt.chapter4 package.
  2. Add the following imports to the top of the file:
        import scala.concurrent.duration._ 
        import scala.concurrent.{Await, Future} 
  1. Create a test application, as follows:
        object ForComprehensions extends App { 
          val futureA = Future(20 + 20) 
          val futureB = Future(30 + 30) 
          val finalFuture: Future[Int] = for { 
            a <- futureA 
            b <- futureB 
            } yield...