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

Persisting the state to LevelDB

Akka persistence defines the mechanism to store the state of your actors by storing either a sequence of events or complete snapshots. However, Akka persistence does not impose which underlying technology to use as the data store for them. Akka persistence basically acts as the API. A simple solution to understand how Akka persistence works is LevelDB. LevelDB stores events in the local filesystem, and it is not a replicated journal. That is why it is not recommended that you use LevelDB in a production environment.

In this recipe, we will review how to define which underlying technology we want for persistence, in this case, LevelDB. LevelDB provides a plugin for the journal, but not for snapshots. That is why we will not talk about snapshots in this recipe.

Getting ready

To step through this recipe, we need to import the hello-Akka project in the IDE; other prerequisites are the same as earlier as we have downloaded the akka-persistence dependency. 

How to do...