Book Image

Reactive Programming With Java 9

By : Tejaswini Mandar Jog
Book Image

Reactive Programming With Java 9

By: Tejaswini Mandar Jog

Overview of this book

<p>Reactive programming is an asynchronous programming model that helps you tackle the essential complexity that comes with writing such applications.</p> <p>Using Reactive programming to start building applications is not immediately intuitive to a developer who has been writing programs in the imperative paradigm. To tackle the essential complexity, Reactive programming uses declarative and functional paradigms to build programs. This book sets out to make the paradigm shift easy.</p> <p>This book begins by explaining what Reactive programming is, the Reactive manifesto, and the Reactive Streams specifi cation. It uses Java 9 to introduce the declarative and functional paradigm, which is necessary to write programs in the Reactive style. It explains Java 9’s Flow API, an adoption of the Reactive Streams specifi cation. From this point on, it focuses on RxJava 2.0, covering topics such as creating, transforming,fi ltering, combining, and testing Observables. It discusses how to use Java’s popular framework, Spring, to build event-driven, Reactive applications. You will also learn how to implement resiliency patterns using Hystrix. By the end, you will be fully equipped with the tools and techniques needed to implement robust, event-driven, Reactive applications.</p>
Table of Contents (12 chapters)
Free Chapter
1
Introduction to Reactive Programming

Hystrix- an introduction

Hystrix is a framework that enables developers to control the interactions between the distributed services, along with providing additional support for latency tolerance and fault tolerance. This is achieved by isolating the failing services, which, in turn, stop cascading the effect of failure, and provides the fallback options.

In 2011, the Netflix API team started working on the resiliency engineering, and, up until 2012, it has been adopted by many teams within Netflix. Today, billions of isolated calls are executed using Hystrix. Hystrix aims to provide the following facilities:

  • It provides protection from, as well as control over, the latency and the failure which is usually caused when we try to access third-party dependencies
  • It doesn't cascade the failure to the components in the distributed system
  • It facilitates fast recovery from the...