Book Image

Hands-On Reactive Programming with Clojure - Second Edition

By : Konrad Szydlo, Leonardo Borges
Book Image

Hands-On Reactive Programming with Clojure - Second Edition

By: Konrad Szydlo, Leonardo Borges

Overview of this book

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.
Table of Contents (15 chapters)

Summary

In this chapter, we explored microservices. First, you saw what distinguishes a microservice from a monolithic application. You learned about the pros and cons of using microservices. Next we explored the topic of even-driven communication. We saw how microservices can communicate with each other using messages and CQRS. We also covered the best practices for designing microservices and some common pitfalls.

You also learned how to implement microservices APIs in Clojure, using the Compojure API. We used the Clojure library, Toucan, to interface with the database, in order to expose data. We used Prismatic's schema to validate data for the API and the Swagger UI to explore the API services.

In the next chapter, we'll look at some ways to test Clojure applications.