In this PPT, we will go through the new feature of Reactive Spring i.e how to work with Reactive Programming in Spring 5.0. These slides also cover: 1. Reactive Architecture and why we need it. 2. Advantages of writing reactive code. 3. How it works with Spring framework.

1. Presented By: Ayush Prashar
Software Consultant
Knoldus Inc.
LEARN NOW
Reactive
Spring

2. About Knoldus
Knoldus is a technology consulting firm with focus on modernizing the digital systems
at the pace your business demands.
DevOps
Functional. Reactive. Cloud Native

3. What’s
in it for me?
LEAN NOW

4. 1 2
3
4
5Can help you judge if
your next project
needs to be Reactive
or not.
Introductory idea
about the
Reactive Streams
A basic
understanding of
Spring!
Understanding the
Reactive Principles
Project Reactor
What to expect after this Webinar

5. 01What is Spring?
02Why Spring
03Reactive
04Reactive Streams and
Reactor
05Demo
Our Agenda

6. “Spring framework is a Java
application development
framework used to provide
comprehensive infrastructural
support”
What is Spring?

7. Dependency
Injection01
Time Tested
02
Features organised
in over 20 Modules04
Dependency
Management03
Why Spring?

8. - Reactive Programming
An asynchronous programming paradigm concerned with data streams and the propagation
of change.
And what is Reactive?
- Reactive Systems
Systems which satisfy certain constraints to remain responsive under any conditions

9. 1
2
3
4
Responsive
Resilient
Elastic
Message
Driven
Reactive
Manifesto

10. c
Why
Reactive?
Product p =
database.getProduct(prodId);
log.info(p.getQuantity());

11. c
How about a callback?

12. Callback Hell
mApi.login(request, new Callback<LoginResponse>() {
@Override
public void success(LoginResponse s, Response response){
mApi.getRoutes(request, new Callback<RoutesResponse>(){
@Override
public void success(RoutesResponses, Response response)
{
...
}
@Override
public void failure(RetrofitError error) {}
}
}
@Override
public void failure(RetrofitError error){}
});

13. c
Why
Reactive?
1. Non Blocking.
2. Better utilization of
computation cycles.
3. Higher throughput of
serving requests.
4. Functional approach.

14. Reactive Spring

15. Reactive
Streams
● Non-Blocking
● Backpressure
● Asynchronous

16. Publisher Subscription ProcessorSubscriber
Traits

17. Producer Subscriber Subscription
Methods
subscribe(Subscriber s); onSubscribe(Subscription s);
onNext(T t);
onError(Throwable t);
onComplete( );
request( long n);
cancel( );

18. Project Reactor
● Implementation of the
Reactive Streams
Specification
● Has two major
implementations of the
Publisher Interface.

19. c
Mono Flux
- Stream of 0 . . 1 element
- Reactive Optional
- Stream of 0 . . N elements
- When working with a list

20. DEMO

21. References
● https://projectreactor.io/
● https://docs.spring.io/
● https://stackoverflow.com/

22. Thank You!
@ayushprashar93
ayush.prashar@knoldus.in