Programação reativa functional com java 8

1. Programação Reativa
Functional com Java 8
Diego Pacheco (@diego_pacheco)
Principal Software Architect at ilegra

2. About Me
Software Architect
~15 IT Experience
~9 SOA Experience
~6 DevOps
~5 FP
~ Scala in Production 2011
@diego_pacheco

7. Functional Programing Principles
❏ Immutability
❏ Disciplined State
❏ No Side Effects
❏ Pure Functions
❏ Function First and High Order Functions
❏ Referential Transparency

8. Immutability

9. Disciplined State

10. No Side Effects

11. Pure Functions
❏ Does not change anything outside scope
❏ In other words: No Side Effects
❏ Same results with Same parameters
❏ Substitution / Refactoring
❏ Enable Referential Transparency
❏ CODE Readability / Expressiveness

12. First class Functions & High Order Functions

13. Referential Transparency
❏ Can be changed by VALUE without
effects on behavior.
❏ No State -> Disciplined State
❏ No Side Effects
❏ Caching
❏ Easy to Debug

14. java.util.Function

15. Lambda Function

16. Lambda Runnable

17. Lambda

18. Lambda Consumer

19. Lambda Producer

20. Lambda + Predicates

21. Lambda + Predicates

22. Lambda Predicates

23. Lambda + Method Ref

24. Functional Interface

25. Lambda + Generics + Functions

26. Lambda + Generics + Functions

27. Lambda + Streams

28. Streams

29. Advanced Streams = For Comprehensions

30. Recursion

31. Currying*

32. Monads

33. Pattern Matcher
https://github.com/aol/cyclops

34. Reactive Manifesto

35. Rx

36. RxJava
https://github.com/ReactiveX/RxJava

37. RxJava

38. RxJava

39. RxJava Samples

40. Observables

41. Observables
https://github.com/ReactiveX/RxJava/wiki/Alphabetical-List-of-Observable-Operators

42. Alternative Reactive Stacks

43. Issues and Lessons Learned
❏ Reactive Thinking
❏ Functions
❏ Drivers
❏ Not All available
❏ Write your own
❏ Error Handling
❏ Complex
❏ Losing Data

44. Java source code at Github
https://github.com/diegopacheco/Diego-Pacheco-Sandbox/tree/master/scripts/java/java8-luna
https://github.com/diegopacheco/Diego-Pacheco-Sandbox/tree/master/scripts/java/java8-fp

45. Programação Reativa
Functional com Java 8
Diego Pacheco (@diego_pacheco)
Principal Software Architect at ilegra