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Hands-On Reactive Programming with Reactor

By : Rahul Sharma

1 (3)

Buy this Book

Hands-On Reactive Programming with Reactor

1 (3)

By: Rahul Sharma

Buy this Book

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.

Preface

Who this book is for

What this book covers

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Free Chapter

Getting Started with Reactive Streams

Technical requirements

Reactive architecture

ReactiveX

Reactive Streams

Reactor

Summary

Questions

Further reading

Data and Stream Processing

Technical requirements

Filtering data

Converting data

Summary

Questions

Processors

Technical requirements

An introduction to processors

Hot versus Cold publishers

Summary

Questions

SpringWebFlux for Microservices

Technical requirements

Introduction to SpringWebFlux

Summary

Questions

Dynamic Rendering

Technical requirements

View templates

Learning about static resources

WebClient

Summary

Questions

Flow Control and Backpressure

Technical requirements

Flow control

Backpressure

Summary

Questions

Handling Errors

Technical requirements

Generating errors

Error recovery

Timeout

WebClient

Summary

Questions

Execution Control

Technical requirements

Scheduler

Parallel processing

Broadcasting

Summary

Questions

Testing and Debugging

Technical requirements

Testing Reactor pipelines

Debugging Reactor streams

Summary

Questions

Assessments

Chapter 1: Getting Started with Reactive Streams

Chapter 2: The Publisher and Subscriber APIs in a Reactor

Chapter 3: Data and Stream Processing

Chapter 4: Processors

Chapter 5: SpringWebFlux for Microservices

Chapter 6: Dynamic Rendering

Chapter 7: Flow Control and Backpressure

Chapter 8: Handling Errors

Chapter 9: Execution Control

Chapter 10: Testing and Debugging

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Chapter 5: SpringWebFlux for Microservices

How can we configure the SpringWebFlux project?

SpringWebFlux can be configured in two ways :

Using annotations: SpringWebFlux supports SpringWebMVC annotations. This is the easiest way of configuring SpringWebFlux.
Using functional endpoints: This model allows us to build Java 8 functions as web endpoints. The application can be configured as a set of routes, handlers, and filters.

Which MethodParameter annotations are supported by SpringWebFlux?

@PathVariable: This annotation is used to access values for URI template variables
@RequestParam: This annotation is used to determine values passed as query parameters
@RequestHeader: This annotation is used to determine values passed in request headers
@RequestBody: This annotation is used to determine values passed in the request body
@CookieValue: This annotation is used to determine...