Book Image

Mastering Akka

By : Christian Baxter
Book Image

Mastering Akka

By: Christian Baxter

Overview of this book

For a programmer, writing multi-threaded applications is critical as it is important to break large tasks into smaller ones and run them simultaneously. Akka is a distributed computing toolkit that uses the abstraction of the Actor model, enabling developers to build correct, concurrent, and distributed applications using Java and Scala with ease. The book begins with a quick introduction that simplifies concurrent programming with actors. We then proceed to master all aspects of domain-driven design. We’ll teach you how to scale out with Akka Remoting/Clustering. Finally, we introduce Conductr as a means to deploy to and manage microservices across a cluster.
Table of Contents (17 chapters)
Mastering Akka
Credits
About the Author
Acknowledgments
About the Reviewer
www.PacktPub.com
Preface

Using Cassandra for our persistent store


In Chapter 1, Building a Better Reactive App, in the section titled Cassandra to the rescue, I talked about why Cassandra will be a good fit for our bookstore application. It's distributed and highly available with great performance on the write side. It seems really tailor-made to fit what an event sourced application needs to do. In this section, we will get it installed and then go over the Akka config, which you will need to use it for both the AsyncWriteJournal and the SnapshotStore.

Installing Cassandra

Thanks to our decision to use Docker, there is no real install that we need to do to get Cassandra set up on our local systems. In this chapter, in the Docker Compose configuration (contained in the docker-compose.yml file found at the root of the bookstore app directory structure) we have replaced Postgres with Cassandra. All we need to do is launch the bookstore app as we have done previously (via docket-build.sh and then launch.sh) and we will...