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 simple Akka Streams

A stream is a set of components with different responsibilities. Some components consume data, some transform data, and others deliver data. Akka Streams uses these components as modular pieces that you put together to create a runnable stream. These pieces help you not only understand the overall design of your topology, but they also aid in maintainability. In addition, they are reusable, which allows us to use the don't repeat yourself (DRY) principle.

Each stream topology basically consists of the following:

  • Source: This is the entry point to your stream. There must be at least one in every stream. 
  • Sink: This is the exit point of your stream. There must be at least one in every stream.
  • Flow: This is the component responsible for manipulating the elements of the stream. You can have none or any number of them.

These components are also known as stages. There are multiple built-in stages that allow you to do the most common operations. These operations range from...