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

The aggregator pattern

The aggregator pattern is mainly used to collect data from different sources, package that data together, and then proceed to do something with the aggregated outcome. A good example is retrieving account balances from multiple accounts. Once you have all the required information, you package and deliver it together to, for example, a mobile device or an API.

In this recipe, we will look at how to use the Aggregator trait, which provides the means to achieve the behavior we explained in the previous paragraphs. The Aggregator trait is also part of the akka-contrib module. To demonstrate this, we will create a social network feed aggregator. This aggregator actor will ask other actors for the latest posts in various social networks from a given user. Since accessing the real APIs of social networks is out of the scope of this recipe, we will just simulate it using some other actors.

Getting ready

To step through this recipe, we need to import the Hello-Akka project; all...