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

Concurrency

The term concurrency is used when multiple threads are used in the application. Concurrency is the ability to execute multiple programs or parts of programs in parallel. Take into consideration an operation which is time-consuming and involves many subtasks executed one by one. However, the subtasks involved in the process are not necessarily executed one by one. Sometimes, the order of execution of these functions is unimportant and they can be executed in any order.

Let's consider a task of generating a result sheet for any exam conducted for 100 participants and each participant will appear for 4 papers. The very first task has to correct the answer sheets, followed by entering the marks in the result sheet. Get marks for all the papers, and then apply the formula to calculate the total followed by a percentage, and then again, add these entries in the final...