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

Writing persistent and clustered services

Another advantage of using Lagom is the ease of having persistent and cluster services. Persistent and clustered services are possible thanks to Akka persistence, Akka cluster, and Akka cluster sharding. Traditionally, developers have used the well-known CRUD operations to implement persistence for their data. Lagom, however, adopts event sourcing and Command Query Responsibility Segregation (CQRS) as the techniques to implement persistence. Event sourcing and CQRS is a pattern to achieve persistence by storing state changes as historical events instead of the actual modified state. These changes are immutable and only get appended to the data store, which improves the write performance. There is no modification of the stored data. This brings in a new set of advantages, such as the possibility to restore state just by executing the ordered list of changes or having a complete log about what happened in the lifetime of an object and not just the...