1. Rethinking HTTP apps using Ratpack
Naresha K
@naresha_k
naresha.k@gmail.com

4. Thread per Request

6. Non-blocking

7. Asynchronous

8. Non-blocking
Asynchronous

9. Non-blocking Asynchronous
Non-blocking
Asynchronous

13. Guice
Reactive Streams

14. Ratpack Goals

15. Fast,
scalable,
& efficient

16. Allow applications to
evolve in complexity
without compromise

17. leverage the benefits of
non-blocking
programming and
reduce the costs

18. flexible and
unopinionated in
integrating other tools
and libraries

19. Testability

20. Not a full-stack
solution

21. Architecture

22. Non Blocking

23. Non Blocking
Event Loop
I/O
Thread Pool
Execution
Queue
I/O op
I/O
complete

24. Creating a Ratpack (Java) App

27. Creating a Ratpack App
using Groovy Script

29. Creating a Ratpack App
(Groovy)

37. Working with handlers

41. Performing Blocking operation

43. Ratpack execution model

48. Lazy Evaluation

49. [ratpack-compute-125-2] ERROR ratpack - Body type:
ratpack.exec.internal.DefaultPromise
curl -X POST -H "Content-Type: Application/json"
-d '{"title": "Asynch Web"}' localhost:5050/proposal

50. curl -X POST -H "Content-Type: Application/json"
-d '{"title": "Asynch Web"}' localhost:5050/proposal
Asynch Web%

51. Composing

59. Resources
• Project Home - https://ratpack.io/
• User guide - https://ratpack.io/manual/current/
• Discussion forum - https://forum.ratpack.io/
• Example code - https://github.com/ratpack/example-
books
• Code samples from an old talk - https://github.com/
naresha/functionalconf2015
• Live coding demo - https://www.youtube.com/watch?
v=y9e_O2GFkdA
• http://sdkman.io/ SDK Manager (to manage multiple
versions of SDKs)

60. @naresha_k
naresha.k@gmail.com
https://www.slideshare.net/nareshak

61. Thank you