This is my presentation about Reactive Programming with Spring 5 I have done at my company, Ancestry

1. Why Reactive?
Reactive Programming With Spring 5
Dane Savot

2. Agenda
1. Why Reactive?
1. The Current Processing Model (Spring MVC)
2. The Reactive runtime (Non-Blocking Runtime)
2. Reactive Programming With Spring 5
1. Imperative vs Reactive Style Programming
2. Reactive Stream
3. Project Reactor
4. Example Usage (Reactive Repository)
5. Demo

3. Current Processing Model in Spring MVC World

13. Non-blocking Runtime

15. Reactive Programming
With Spring 5

16. Imperative vs Reactive Style Programming
List<Order> orders = repository.getOrders(id); -> block
filter(orders); -> block
List<Product> products = orders.stream().foreach(order -> {
order.addProducts(getProducts(order.orderId)); ->block
}); ->block
return orders;
Flux<Order> order = repository.getOrder(id)
.filter(order -> order.getName().match(“A**”))
.subscription( order -> {
order.addProduct(getProduct(order.orderId));
return orders;

17. Reactive Programming
Reactive Programming manages asynchronous data flows between producers of data and consumers
that need to react to that data in a non-blocking manner.
So, Reactive Programming is all about non-blocking applications that are asynchronous and
event-driven and require a small number of threads to scale. (Dzone.com)

18. Reactive Streams

19. public interface Subscriber<T> {
void onSubscribe(Subscription sub);
void onNext(T item);
void onError(Throwable ex);
void onComplete();
}
public interface Subscription
{
void request(long n);
void cancel();
}
public interface Publisher<T> {
void subscribe(Subscriber<? super T> subscriber);
}
Reactive Streams

21. Project Reactor

27. onSubscribe
request(unbounded)
onNext(User: Jason)
onNext(User: Jay)
...
onComplete()

29. onSubscribe
request(2)
onNext(User: Jason)
onNext(User: Jay)
request(2)
onNext(User: Joe)
onNext(User: John)
...

37. References
1. SpringOne Platform 2016 Keynote - Reactive Spring
2. From Imperative To Reactive Web Apps
3. Reactive Programming With Spring 5
4. Doing Reactive Programming with Spring 5