Building Reactive Microservices with JHipster & K8s

Microservices are everywhere; These isolated and independent services brings in a lot of benefits (nightmares included). On the other hand, Reactive programming enables you to build resilient systems. Combining these two we can build resilient applications that thrive in high load with low latency. In this session, I’ll show you how to use JHipster to create a reactive microservices architecture with Spring Boot, Spring Cloud, and run it all in Kubernetes.

Bonus Bonus: Why split only your Backend services? When you can split your frontend too? Lets go microfrontends.

Transcript

1. @sendilkumarn Reactive Microservices with JHipster SENDIL KUMAR N
2. @sendilkumarn @sendilkumarn
3. @sendilkumarn Why Microservices?
4. @sendilkumarn Microservices
5. @sendilkumarn Microservices Microservices Microservices
6. @sendilkumarn Microservices Microservices Microservices
7. @sendilkumarn Microservices Microservices
8. @sendilkumarn Microservices Independent Deployability Microservices
9. @sendilkumarn Microservices contract contract contract contract Microservices
10. @sendilkumarn Microservices I own my data I own my data I own my data I own my data Microservices
11. @sendilkumarn Microservices Microservices Microservices Microservices
12. @sendilkumarn Do one thing & do it well Independent deployability No single point of failure
13. @sendilkumarn Why Reactive microservices?
14. @sendilkumarn Highly-interactive & ultra-fast experiences Things that scale dynamically Utilize the maximum benefit out of the systems Reactive µ-service
15. @sendilkumarn Service Service Over a network Reactive µ-service
16. @sendilkumarn Reactive µ-service Get me some data. Green → Yellow service - latency : 50ms Yellow → Orange service - latency : 100ms Yellow → Blue service - latency : 20ms 170 ms
17. @sendilkumarn Reactive µ-service Get me some data. Green → Yellow service - latency : 50ms Green → Orange service - latency : 100ms Green → Blue service - latency : 20ms 100 ms Reactive µ-service
18. @sendilkumarn Non-blocking Reactive µ-service
19. @sendilkumarn Reactive µ-service Responsive Resilient Elastic Message Driven Reactive µ-service
20. @sendilkumarn Reactive µ-service Asynchronous Message Passing Reactive µ-service
21. @sendilkumarn Reactive µ-service In a reactive system, every part should be reactive Reactive µ-service
22. @sendilkumarn more than 750 req/s Reactive µ-service
23. @sendilkumarn Reactive µ-service
24. @sendilkumarn
25. @sendilkumarn
26. @sendilkumarn Spring Reactive
27. @sendilkumarn Spring Reactive @PostMapping("/users") public User createUser(@Valid @RequestBody User user) { // Handle errors User result = userRepository.save(user); // do something with the result return ResponseEntity .created(new URI("/api/users/" + result.getId())) .headers(HeaderUtil.createEntityCreationAlert (...)) .body(result); } Spring Reactive
28. @sendilkumarn Spring Reactive @PostMapping("/users") public Mono<User> createUser(@Valid @RequestBody User user) { // Handle errors return userRepository.save(user) .flatMap( // Do something with the users ) .map( result -> return ResponseEntity .created(new URI("/api/users/" + result.getId())) .headers(HeaderUtil.createEntityCreationAlert (...)) .body(result); ) } Reactive Spring Reactive
29. @sendilkumarn Spring Reactive Gateway Service A Service B Message Queue
30. @sendilkumarn Spring Reactive Gateway Service A Service B Message Queue reactive reactive reactive reactive Spring Reactive
31. @sendilkumarn Spring Reactive Spring Reactive
32. @sendilkumarn Being Reactive makes our services responsive, resilient, elastic, and message-driven Spring Boot 2.0 introduced reactive programming for spring based applications But that is a lot…
33. @sendilkumarn JHipster
34. @sendilkumarn JHipster JHipster is a open source app. generator
35. @sendilkumarn JHipster JHipster is a development platform open source app. generator
36. @sendilkumarn JHipster JHipster generates all bells & whistles development platform
37. @sendilkumarn JHipster Server Client Deployments CI/CD templates Angular / React / Vue / Svelte Java / Kotlin Docker / K8s / AWS / GAE GitHub / Gitlab / Sonar…
38. @sendilkumarn npm i -g generator-jhipster JHipster
39. @sendilkumarn mkdir app && cd app npm i -g generator-jhipster JHipster
40. @sendilkumarn mkdir app && cd app npm i -g generator-jhipster jhipster JHipster
41. @sendilkumarn Options • Monolithic / Microservices / Gateway • Spring WebFlux / Spring MVC • Authentication • Database • Build Tool - Maven / Gradle • Web Framework JHipster
42. @sendilkumarn https://start.jhipster.tech/ JHipster
43. @sendilkumarn Demo!
44. @sendilkumarn Recap Why Microservices? Why Reactive µ-service? Spring Reactive Code walkthrough JHipster Generated microservices with JHipster Deploy on Kubernetes
45. @sendilkumarn Questions
46. @sendilkumarn Thanks!!!