Book Image

Clojure Programming Cookbook

Book Image

Clojure Programming Cookbook

Overview of this book

When it comes to learning and using a new language you need an effective guide to be by your side when things get rough. For Clojure developers, these recipes have everything you need to take on everything this language offers. This book is divided into three high impact sections. The first section gives you an introduction to live programming and best practices. We show you how to interact with your connections by manipulating, transforming, and merging collections. You’ll learn how to work with macros, protocols, multi-methods, and transducers. We’ll also teach you how to work with languages such as Java, and Scala. The next section deals with intermediate-level content and enhances your Clojure skills, here we’ll teach you concurrency programming with Clojure for high performance. We will provide you with advanced best practices, tips on Clojure programming, and show you how to work with Clojure while developing applications. In the final section you will learn how to test, deploy and analyze websocket behavior when your app is deployed in the cloud. Finally, we will take you through DevOps. Developing with Clojure has never been easier with these recipes by your side!
Table of Contents (16 chapters)
Clojure Programming Cookbook
About the Authors
About the Reviewer

Distributed actor-based dev with Akka

Akka is a concurrent, distributed, and fault-tolerant framework and runtime environment developed by Lightbend (formerly Typesafe). It supports the actor model initially developed in Erlang. So, Akka is greatly inspired by Erlang's actor.

The following image shows collaborating tasks by sending messages among actors. Actors send messages via mail boxes. Receiving actors check their mail boxes and process them. Actors can organize hierarchies. Parent actors can request their subtasks to child actors:

Akka itself is developed in Scala but it supports Java. We will use Okku, a Clojure wrapper for Akka.

Getting ready

The okku is a small wrapper for Akka. We need to add the okku to your project.clj file to run samples (or any other dependency management you are using):

  [[org.clojure/clojure "1.8.0"] 
   [org.clojure.gaverhae/okku "0.1.5"] 

How to do it...

Let's learn how to use Akka via okku!

Your first okku

Let's declare okku.core and some akka...