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Deep-dive into Reactive programming.pdf
- 1. © 2022 Thoughtworks | Confidential Reactive Programming Mritunjay Dubey & Kumar Sankara Iyer
- 2. © 2022 Thoughtworks | Confidential Table of contents Setup 03 Threading models and Demo 04 Reactive programming concepts and Spring Webflux 05 Reactive Data types & Operators and hands-on 06 Corner cases, Error handling and hands-on 07 Reactor context demo 10 Demo of end-to-end streams 13 Miscellaneous topics 17 2
- 3. © 2022 Thoughtworks | Confidential Setup 3
- 4. © 2022 Thoughtworks | Confidential Prerequisites for hands-on 1. Install Java 17 (preferred) 2. Use an IDE like Intellij 3. Install Git (good to have) 4. Install Postman (good to have) 5. Clone the code from https://github.com/reactive-workshop/reactive-building-blocks 6. Run ./gradlew bootRun 7. Import Reactive-Workshop.postman_collectioninto Postman and run the first API “Get User By User Id” 4
- 5. © 2022 Thoughtworks | Confidential Threading models 5
- 6. © 2022 Thoughtworks | Confidential Thread-per-request model 6
- 7. © 2022 Thoughtworks | Confidential Drawbacks of the thread-per-request model The thread-per-request model is neither performant not scalable Context switching is expensive Threads are blocked while I/O is in progress 7 A thread takes a minimum of 1 MB of stack size Threads increase as the number of requests
- 8. © 2022 Thoughtworks | Confidential Event-loop model 8
- 9. © 2022 Thoughtworks | Confidential Netty 9 A framework to create asynchronous, event-driven applications
- 10. © 2022 Thoughtworks | Confidential Demo on threading models 10
- 11. © 2022 Thoughtworks | Confidential Reactive programming concepts and Spring Webflux 11
- 12. © 2022 Thoughtworks | Confidential 12 Asynchronous 1. Reactive streams There are several implementations of the Reactive streams specification - RxJava, Reactor, Akka streams, RxJavaScript and so on A standard for asynchronous stream processing Non-blocking 2. Backpressure 3. 12 © 2022 Thoughtworks
- 13. © 2022 Thoughtworks | Confidential Reactive streams - some keywords 13
- 14. © 2022 Thoughtworks | Confidential Spring Webflux 14 A fully Reactive framework that embraces Functional Reactive Programming
- 15. © 2022 Thoughtworks | Confidential Reactive Data types & Operators 15
- 16. © 2022 Thoughtworks | Confidential Mono Mono is a Reactive Streams Publisher that emits at most one item and then terminates 16 16 For eg;
- 17. © 2022 Thoughtworks | Confidential Flux Flux is a Reactive Streams Publisher that emits 0 to N elements and then completes 17 17 For eg;
- 18. © 2022 Thoughtworks | Confidential map 18 18 © 2022 Thoughtworks Transforms a Flux to another Flux by applying a synchronous function to each item
- 19. © 2022 Thoughtworks | Confidential flatMap 19 19 © 2022 Thoughtworks Flatten the inner publishers into a single Flux through merging, allowing them to interleave
- 20. © 2022 Thoughtworks | Confidential filter 20 20 © 2022 Thoughtworks Evaluate each source value against the given predicate
- 21. © 2022 Thoughtworks | Confidential zip 21 21 © 2022 Thoughtworks Wait for all sources to emit one element, then combine these elements. Continue till any of the sources complete
- 22. © 2022 Thoughtworks | Confidential Hands-on with Reactor operators 22
- 23. © 2022 Thoughtworks | Confidential Corner cases and Error handling 23
- 24. © 2022 Thoughtworks | Confidential switchIfEmpty 24 24 © 2022 Thoughtworks Switch to an alternative publisher if this publisher is empty
- 25. © 2022 Thoughtworks | Confidential onErrorMap 25 25 © 2022 Thoughtworks Transform a source error to another error
- 26. © 2022 Thoughtworks | Confidential onErrorResume 26 26 © 2022 Thoughtworks Subscribe to a fallback publisher if any error happens in source
- 27. © 2022 Thoughtworks | Confidential Hands-on with error handling 27
- 28. © 2022 Thoughtworks | Confidential Reactor context - a demo 28
- 29. © 2022 Thoughtworks | Confidential End-to-end streams - a demo 29
- 30. © 2022 Thoughtworks | Confidential Miscellaneous 30
- 31. © 2022 Thoughtworks | Confidential Reactive programming is fun! Building and running on reactive applications on production requires Further reading Learning curve 31 Blocking calls A word on Testing
- 32. © 2022 Thoughtworks | Confidential Discussion 32
- 33. © 2022 Thoughtworks | Confidential Thankyou 33