Benefits of Reactive Programming with Reactor and Spring Boot 2 by Violeta Georgieva at SpringOne Tour 2019

1. Benefits of Reactive Programming
with Reactor and Spring Boot 2
Violeta Georgieva
@violeta_g_g

2. Violeta Georgieva
2

3. Intro
• Spring Framework 5
• WebFlux
• WebFlux Fn
• Functional, reactive WebClient
• Project Reactor
• Reactor Core
• Reactor Netty
• Spring Boot 2
3

4. Blocking vs Non-blocking

5. Synchronous Processing
Blocking - Remote Call
5

6. Synchronous Processing
Blocking - Slow Client
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7. Asynchronous Processing - Blocking
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8. Asynchronous Processing
Blocking - Slow Client
8

9. Non-blocking and Event Loops
9
worker
IO
selector
Delegate
Callback

10. Use Cases

11. 11

12. Benefits
• Connection volume scalability
• Less threads, less memory
• Ability to serve mixed traffic
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13. Performance

14. Scenario 1 - Hello World
• WebFlux.Fn - Reactor Netty 4 threads
• MVC - Tomcat 200 threads
• MVC - Tomcat 600 threads
1500 30s 3min
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15. 15
WebFlux Fn - 4 Threads Web MVC - 200 Threads

16. 16
WebFlux Fn - 4 Threads Web MVC - 200 Threads

17. 17
WebFlux Fn - 4 Threads Web MVC - 600 Threads

18. 18
WebFlux Fn - 4 Threads Web MVC - 600 Threads

19. Scenario 2 - Hello World
• WebFlux.Fn - Reactor Netty 4 threads
• MVC - Tomcat 200 threads
• Simulate slow client - 20ms delay
1500 30s 3min
19

20. 20
WebFlux Fn - 4 Threads Web MVC - 200 Threads

21. 21
WebFlux Fn - 4 Threads Web MVC - 200 Threads

22. Scenario 3 - 16k response
• WebFlux.Fn - Reactor Netty 4 threads
• MVC - Tomcat 200 threads
1500 30s 3min
22

23. 23
WebFlux Fn - 4 Threads Web MVC - 200 Threads

24. 24
WebFlux Fn - 4 Threads Web MVC - 200 Threads

25. Scenario 4 - 16k response
• WebFlux.Fn - Reactor Netty 4 threads
• MVC - Tomcat 200 threads
• Simulate slow client - 20ms delay
1500 30s 3min
25

26. 26
WebFlux Fn - 4 Threads Web MVC - 200 Threads

27. 27
WebFlux Fn - 4 Threads Web MVC - 200 Threads

28. THANK YOU
@violeta_g_g
violetagg