Hands-On Reactive Programming with Clojure: Create asynchronous, event-based, and concurrent applications , Second Edition

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A Look at Reactive Extensions

Reactive Extensions (Rx) is a Reactive Programming library from Microsoft that's used for building complex asynchronous programs. It models time-varying values and events as observable sequences and is implemented by extending the Observer design pattern.

Its first target platform was .NET, but Netflix has ported Rx to JVM under the name RxJava. Microsoft also develops and maintains a port of Rx to JavaScript called RxJS, which is the tool we used to build the sine wave application. The two ports work a treat for us, since Clojure runs on JVM and ClojureScript in JavaScript environments.

As we saw in Chapter 1, What is Reactive Programming?, Rx is inspired by Functional Reactive Programming but uses different terminology. In FRP, the two main abstractions are behaviors and events. Although the implementation details are different, observable...

Key benefits

Leverage the features of Functional Reactive Programming using Clojure

Create dataflow-based systems that are the building blocks of Reactive Programming

Use different Functional Reactive Programming frameworks, techniques, and patterns to solve real-world problems

Description

Reactive Programming is central to many concurrent systems, and can help make the process of developing highly concurrent, event-driven, and asynchronous applications simpler and less error-prone. This book will allow you to explore Reactive Programming in Clojure 1.9 and help you get to grips with some of its new features such as transducers, reader conditionals, additional string functions, direct linking, and socket servers. Hands-On Reactive Programming with Clojure starts by introducing you to Functional Reactive Programming (FRP) and its formulations, as well as showing you how it inspired Compositional Event Systems (CES). It then guides you in understanding Reactive Programming as well as learning how to develop your ability to work with time-varying values thanks to examples of reactive applications implemented in different frameworks. You'll also gain insight into some interesting Reactive design patterns such as the simple component, circuit breaker, request-response, and multiple-master replication. Finally, the book introduces microservices-based architecture in Clojure and closes with examples of unit testing frameworks. By the end of the book, you will have gained all the knowledge you need to create applications using different Reactive Programming approaches.

What you will learn

Understand how to think in terms of time-varying values and event streams

Create, compose, and transform observable sequences using Reactive extensions

Build a CES framework from scratch using core.async as its foundation

Develop a simple ClojureScript game using Reagi

Integrate Om and RxJS in a web application

Implement a reactive API in Amazon Web Services (AWS)

Discover helpful approaches to backpressure and error handling

Get to grips with futures and their applications

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