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Reactive Programming in Kotlin

You're reading from   Reactive Programming in Kotlin Design and build non-blocking, asynchronous Kotlin applications with RXKotlin, Reactor-Kotlin, Android, and Spring

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Product type Paperback
Published in Dec 2017
Publisher Packt
ISBN-13 9781788473026
Length 322 pages
Edition 1st Edition
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Author (1):
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Rivu Chakraborty Rivu Chakraborty
Author Profile Icon Rivu Chakraborty
Rivu Chakraborty
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Table of Contents (13) Chapters Close

Preface 1. A Short Introduction to Reactive Programming 2. Functional Programming with Kotlin and RxKotlin FREE CHAPTER 3. Observables, Observers, and Subjects 4. Introduction to Backpressure and Flowables 5. Asynchronous Data Operators and Transformations 6. More on Operators and Error Handling 7. Concurrency and Parallel Processing in RxKotlin with Schedulers 8. Testing RxKotlin Applications 9. Resource Management and Extending RxKotlin 10. Introduction to Web Programming with Spring for Kotlin Developers 11. REST APIs with Spring JPA and Hibernate 12. Reactive Kotlin and Android

Spring – AOP


Before learning how to implement Aspect-oriented programming with Spring, we should first learn what Aspect-oriented programming is. The definition of Aspect-oriented programming says it is a programming paradigm that aims to increase modularity by allowing the separation of cross-cutting concerns. It does so by adding additional behavior to existing code (an advice) without modifying the code itself.

Now, what did we mean by cross-cutting concerns? Let's explore.

In a real-life project, multiple components play their own role. For example, if we take our previous scenario into account, the Student class itself is a component, similarly there could be a faculty component who would evaluate the student based on his/her performance. So, let's add a faculty to our program.

The Faculty class should be simple enough, with just a method to evaluate a student. Just as follows:

    class Faculty { 
      fun evaluateAssignment() { 
        val marks = Random().nextInt(10) 
        println...
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