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

How to transform streams and consume them

As mentioned before, a Source is responsible for consuming elements and emitting them through the stream. A Flow is responsible for transforming elements as they go. In this recipe, we will revisit the out-of-the-box transforming functions a Flow provides. In a later recipe, we will see how we can create more complicated Flows using the Graph DSL.

Getting ready

We will use the same prerequisites as that of the previous recipe. This time, we will implement a stream to do a word count. We will consume a GZIP compressed file and count the occurrences of each word.

How to do it...

For this recipe, perform the following steps:

  1. Create a test file named gzipped-file inside src/main/resources with the following contents:
        hello world from akka streams! No seriously,
  1. Then compress the file. This can be easily achieved using the gzip gzipped-file command. You should end up with a compressed file named gzipped-file.gz...