Book Image

Hands-On Reactive Programming with Reactor

By : Rahul Sharma
Book Image

Hands-On Reactive Programming with Reactor

By: Rahul Sharma

Overview of this book

Reactor is an implementation of the Java 9 Reactive Streams specification, an API for asynchronous data processing. This specification is based on a reactive programming paradigm, enabling developers to build enterprise-grade, robust applications with reduced complexity and in less time. Hands-On Reactive Programming with Reactor shows you how Reactor works, as well as how to use it to develop reactive applications in Java. The book begins with the fundamentals of Reactor and the role it plays in building effective applications. You will learn how to build fully non-blocking applications and will later be guided by the Publisher and Subscriber APIs. You will gain an understanding how to use two reactive composable APIs, Flux and Mono, which are used extensively to implement Reactive Extensions. All of these components are combined using various operations to build a complete solution. In addition to this, you will get to grips with the Flow API and understand backpressure in order to control overruns. You will also study the use of Spring WebFlux, an extension of the Reactor framework for building microservices. By the end of the book, you will have gained enough confidence to build reactive and scalable microservices.
Table of Contents (13 chapters)

Testing and Debugging

Throughout this book, we have covered Reactor in great detail, working with its various operators and building examples using them. However, writing code is only half of the job. All production code must also be verified with adequate unit tests. These tests not only validate our code, but they also enable us to make changes faster. If we refactor code, the tests ensure that our change has not broken any existing functionality. In this chapter, we will cover the testing support offered by Reactor. Testing business code will catch most of the issues, but the code will fail in production. In such scenarios, the code needs to be debugged in order to find the root cause of the failure. In this chapter, we will also cover some basic techniques to debug Reactor pipelines.

In this final chapter, we will learn how to:

  • Test Reactor pipelines
  • Debug Reactor streams...