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

Understanding service descriptors

Lagom strictly separates the API definition from its actual implementation. This brings some advantages, such as separation of concerns, easy understanding of the contract of a service, the possibility to have multiple implementations for a given API and straightforward communication between services by just importing the API module. This separation occurs by having different modules at the project level.

The service descriptor is the main piece in the API module. It describes what the different endpoints of your service are. This happens by describing each endpoint with a call identifier. These call identifiers characterize the endpoint name as well as the expected request and response types through the ServiceCall definition. Moreover, the call identifier tells which underlying transport network protocol should be used. In this recipe, we will explain the different available call identifiers and service calls and explain the automatic Access Control List...