今日こそ理解するHot変換@社内RxSwift勉強会

Transcript

1. ࠓ೔ͦ͜ཧղ͢Δ Hotม׵ @ࣾ಺RxSwiftษڧձ

2. https://speakerdeck.com/ukitaka/cold-at-she-nei-rxswiftmian-qiang-hui લճͷଓ͖

3. Hotม׵

4. Cold → Hot

5. (෮श)Hotʹؔ࿈͢ΔΦϖϨʔλ Hotʹؔ࿈͢ΔΦϖϨʔλ͸ҎԼͷΈɻ ͜ΕΒ͕ಛʹݺ͹Εͯͳ͚Ε͹Hotʹม׵͞ΕΔ͜ͱ΋ͳ͍ɻ • multicast / publish • replay /

   replayAll • connect / refCount • share / shareReplay • shareReplayLatestWhileConnected

6. ·͊ͱΓ͋͑ͣ࢖ͬͯΈΔ͔

7. publish()

8. Question1 ͳΜͱදࣔ͞ΕΔͰ͠ΐ͏ʁ

9. None

10. ͜Μͳͷ؆୯͡ΌΜʂ 1,2,3Ͱ͠ΐʂ

11. ͜Μͳͷ؆୯͡ΌΜ Sequence Map Hot subscribe Քಇ

12. ͜Μͳͷ؆୯͡ΌΜ Sequence Map Hot subscribe Քಇ

13. Answer ਖ਼ղ͸…

14. A. ͳʹ΋දࣔ͞Εͳ͍

15. !?

16. (෮श)Hotʹؔ࿈͢ΔΦϖϨʔλ Hotʹؔ࿈͢ΔΦϖϨʔλ͸ҎԼͷΈɻ ͜ΕΒ͕ಛʹݺ͹Εͯͳ͚Ε͹Hotʹม׵͞ΕΔ͜ͱ΋ͳ͍ɻ • multicast / publish • replay /

    replayAll • connect / refCount • share / shareReplay • shareReplayLatestWhileConnected ؚΈͷ͋Δݴ͍ํ

17. Hotม׵ ϙΠϯτͦͷ1 ConnectableObservable

18. ͭ͡͸publish()ͷฦΓ஋…

19. ConnectableObservable • connect() ϝιουΛ࣋ͭ • connect() ΛݺͿ͜ͱͰHotʹม׵׬ྃ͢Δ • connect() ΛݺͿ·ͰObserver͕͍Α͏͕͍

    ·͍͕ಈ࡞͠ͳ͍

20. ConnectableObservable

21. ͳΜͰඞཁͳͷʁ • ྫ͑͹ɺෳ਺ͷobserver͕Hotม׵͞Εͨετ ϦʔϜͷ஋Λ࠷ॳ͔ΒͪΌΜͱड͚औΓ͍ͨ ࣌ɻconnect()ΛݺͿ·Ͱಈ࡞͠ͳ͍ͷͰɺͦ ͷؒʹશͯͷobserverΛsubscribe͓ͤͯ͘͞ ͜ͱ͕Ͱ͖Δɻ

22. ͳΜͰඞཁͳͷʁ (ConnectableObservable͕ແ͍ͱͲ͏ͳΔ͔͸ߟ͑ͯΈ͍ͯͩ͘͞)

23. ConnectableObservableΛฦ͢Operator • multicast() • publish() • replay(bufferSize:) • replayAll()

24. multicast() • ͦ΋ͦ΋Hotม׵ͱ͸ɺ಺෦తʹSubjectΛར ༻͍ͯ͠Δ͚ͩͰ͋Δɻ • multicast()͸SubjectΛࢦఆͯͦ͜͠ͰҰ୴Π ϕϯτΛड͚ΔΑ͏ʹ͢ΔOperator

25. multicast()

26. publish() • PublishSubjectʹmulticast͢Δ

27. • ReplaySubjectʹmulticast͢Δ replay(bufferSize:) / replayAll()

28. ConnectableObservable·ͱΊ • ColdͳObservableʹରͯ͠ɺmulticast() / publish() / replay(bufferSize:) / replayAll() Λݺͼ

    ग़͢͜ͱͰ ConnectableObservableʹม׵Ͱ͖ Δɻ • ConnectableObservableʹରͯ͠connect()Λݺͼ ग़͢͜ͱͰHotͳObservableʹม׵͕׬ྃ͢Δɻ

29. ࣍΁…

30. ConnectableObservable ཧղͨ͠

31. ଞͷHotؔ࿈ͷOperator͸ʁ

32. (෮श)Hotʹؔ࿈͢ΔΦϖϨʔλ Hotʹؔ࿈͢ΔΦϖϨʔλ͸ҎԼͷΈɻ ͜ΕΒ͕ಛʹݺ͹Εͯͳ͚Ε͹Hotʹม׵͞ΕΔ͜ͱ΋ͳ͍ɻ • multicast / publish • replay /

    replayAll • connect / refCount • share / shareReplay • shareReplayLatestWhileConnected

33. ͱΓ͋͑ͣshare()Ͱ΋ ࢖ͬͯΈΔ͔

34. share() ConnectableObservable͡Όͳͯ͘ ObservableͰฦ͖ͬͯͯΔ͠ ͖ͬͱHot΍Ζʂʂʂ

35. Question2 ͳΜͱදࣔ͞ΕΔͰ͠ΐ͏ʁ

36. None

37. Answer ਖ਼ղ͸…

38. A. ͳʹ΋දࣔ͞Εͳ͍

39. ƅЧƅ)Űō?

40. Hotม׵ ϙΠϯτͦͷ2 ۂऀ: RefCount

41. share()

42. refCount() • refCount() ͸ ConnectableObservableʹର͠ ͯݺ΂Δ΋͏ҰͭͷOperatorͰ͋Δɻ

43. refCount() • Hotͷ֓೦Λ෴͢ΊΜͲ͍͘͞ศརͳ΍ͭ • Hotͷੑ࣭ͱͯ͠ʮsubscribe͠ͳͯ͘΋ಈ࡞ ͢Δʯͱ͍͏ͷ͕͋Δ͕ɺrefCount͕ڬ·Δ ͱʮHot͕ͩɺ࠷ॳʹsubscribe͞ΕΔ·Ͱಈ ࡞͠ͳ͍ʯΈ͍ͨͳڍಈʹͳΔɻ

44. refCount() • ࡞Γ͸୯७Ͱɺ࠷ॳʹsubscribe͞Εͨ࣌఺Ͱ ಺෦తʹconnect()ΛݺͿɻ

45. Question3 ͳΜͱදࣔ͞ΕΔͰ͠ΐ͏ʁ

46. None

47. Answer ਖ਼ղ͸…

48. A. 1,2,3

49. ͪΌΜͱHotม׵͞Εͯͨ (ͳΜͰʁʂͱࢥͬͨํ͸લճͷεϥΠυ΋ΈͯΈ·͠ΐ͏)

50. ࢒ΓͷOperator

51. shareReplay(bufferSize:) • ໊લͷ௨Γɺshare + replay • share = publish +

    refCount • shareReplay = publish + refCount + replay • ʮHot͕ͩɺ࠷ॳʹsubscribe͞ΕΔ·Ͱಈ࡞͠ͳ ͍ʯΛकΓͭͭࢦఆ͞Εͨݸ਺͚ͩ஋Λreplay͢ Δ

52. shareReplay(bufferSize:) • ࣮͸ΊͬͪΌॏཁͰɺRxSwiftͷExampleͰ΋Α͘ʢʁʣ࢖ ΘΕ͍ͯΔɻ • ม਺తʹѻ͍ͭͭɺ࠶ܭࢉͤ͞ͳ͍Α͏ʹ͢Δͱ͖ʹ shareReplay(1)Λ͚ͭΔͱΑ͍ (͜Εʹ͍ͭͯ͸ผ్ൃද͠ ·͢ɻ) •

    RxSwift v2.5.0࣌఺Ͱ͸shareReplayʹ1Ҏ֎Λ౉͢ͱ࠶ܭࢉ ͕૸Δόάʁ࢓༷ʁ͕͋Δɻshare΋ಉ༷ͷݱ৅༗Γɻ

53. shareReplayLatestWhileConnected() • ໊લ͕ΊͬͪΌ௕͍ • ͜Μͳͷ࢖͏ػձ͋Δͷʁͱࢥ͏͔΋͠Εͳ͍͕ɺ RxSwift(RxCocoa)Ͱఏڙ͞Ε͍ͯΔ Driver͸σϑΥϧτͰ͜Εͱಉ ͡ڍಈΛ͢ΔɻͳͷͰڍಈ͸ཧղ͓ͯ͘͠΂͖ɻ • ShareReplay1

    ͱͷҧ͍͸ɺconnect தͰͳ͍ͱ࠷ޙͷ஋͕औΕͳ͍ ͜ͱɻͭ·Γ1౓ .Completed ͕ྲྀΕͨΒͦͷ͋ͱʹ͸replay͞Ε ͣɺ.Completed ͔͠ྲྀΕͯ͜ͳ͍ɻ • ڍಈͷৄࡉͳྫ͸Driverͷͱ͖ʹઆ໌͢ΔͷͰ͜͜Ͱ͸ׂѪɻ

54. Hotม׵·ͱΊ Hotʹม׵͢Δʹ͸ • ConnectableObservableʹม׵ޙɺconnect() ΛݺͿ • RefCountʹରͯ͠1ͭҎ্subscribeΛߦ͏

55. Ҏ্ʂʂ