今日こそ理解するHot / Cold @社内RxSwift勉強会

by ukitaka

Slide 1

Slide 1 text

ࠓ೔ͦ͜ཧղ͢Δ Hot / Cold @ࣾ಺RxSwiftษڧձ

Slide 2

Slide 2 text

RxͰΈͳ࠷ॳʹͭ·ͮ͘ ϙΠϯτ

Slide 3

Slide 3 text

No content

Slide 4

Slide 4 text

Hot / Cold

Slide 5

Slide 5 text

Hot / Cold • Hot / Cold Ή͔͍ͣ͠ • Hot / Cold Α͘Θ͔Βͳ͍ • Hot / Cold ཧղͰ͖ͳ͍ • Rx೉ͦ͠͏… Rxා͍…

Slide 6

Slide 6 text

ࡾᵆ( ^o^)ᵒ

Slide 7

Slide 7 text

ࡾᵆ( ^o^)ᵒ ※ Bond͸ྑ͍ϥΠϒϥϦͰ͢

Slide 8

Slide 8 text

͜ͷεϥΠυͰ͸ • جຊతͳ֓೦Λཧղ্ͨ͠ͰɺHot / Cold Ͱ ৺͕ંΕͦ͏ʹͳͬͨํΛλʔήοτʹͯ͠ ΔͷͰɺ͋Δఔ౓ͷRxSwiftͷཧղΛඞཁͱ͠ ·͢ɻ

Slide 9

Slide 9 text

͜ͷεϥΠυͰ͸ • ·ͨHotม׵ʹ͍ͭͯ͸௕͘ͳΔͷͰผͷػձ ʹઆ໌͠·͢ɻ • ͱΓ͋͑ͣ Hot / Cold ͷੑ࣭ʹ஫໨ͯ͠આ໌ ͠·͢ɻ

Slide 10

Slide 10 text

͜ͷεϥΠυͰ͸ • ྫ (ΫΠζ) Λग़͠ͳ͕ΒHot / Cold ͦΕͧΕ ͕ͲΜͳੑ࣭Λ͍࣋ͬͯΔͷ͔֬ೝ͍͖ͯ͠ ·͢ɻ • ·ͩͦΕͧΕͷੑ࣭΍ҧ͍Λઆ໌͍ͯ͠ͳ͍ ͷͰ͕͢ɺ͋ͱͰઆ໌͠΍͘͢͢ΔͨΊʹ࠷ ॳʹʮલఏ஌ࣝʯͱʮݟ෼͚ํʯͷϧʔϧΛ આ໌͠·͢ɻ

Slide 11

Slide 11 text

લఏ஌ࣝ

Slide 12

Slide 12 text

લఏ஌ࣝ ͦͷ1 Hot / Cold ͸ ʮObservableʯͷੑ࣭

Slide 13

Slide 13 text

ͳʹΛ౰ͨΓલͷࣄΛ ݴ͍ͬͯΔΜͩίΠπ

Slide 14

Slide 14 text

͡Ό͋ͳʹ͕Observable͔

Slide 15

Slide 15 text

͡Ό͋ͳʹ͕Observable͔ • Subject • PublishSubject, BehaviorSubject, ReplaySubject …

Slide 16

Slide 16 text

͡Ό͋ͳʹ͕Observable͔ • Subject • PublishSubject, BehaviorSubject, ReplaySubject … • Operator • map, ﬁlter, ﬂatMap … • create, of, just, error …

Slide 17

Slide 17 text

͡Ό͋ͳʹ͕Observable͔ • Subject • PublishSubject, BehaviorSubject, ReplaySubject … • Operator ← !? • map, ﬁlter, ﬂatMap … • create, of, just, error …

Slide 18

Slide 18 text

લఏ஌ࣝ ͦͷ2 ֤छOperator (Λද͢Ϋϥε) ͸ ʮObservableʯͰ͋Δ

Slide 19

Slide 19 text

ﬁlter

Slide 20

Slide 20 text

ﬁlter ฦΓ஋ͷܕ͸Observable

Slide 21

Slide 21 text

ﬁlter ࣮ଶ͸ﬁlter operatorΛද͢ Filterͱ͍͏Ϋϥε

Slide 22

Slide 22 text

just

Slide 23

Slide 23 text

just ฦΓ஋ͷܕ͸Observable

Slide 24

Slide 24 text

just ࣮ଶ͸Justͱ͍͏Ϋϥε

Slide 25

Slide 25 text

લఏ஌ࣝ·ͱΊ • Hot / Cold ͸ ʮObservableʯͷੑ࣭ • Subject͸ʮObservableʯ • Operator (Λද͢Ϋϥε) ͸ʮObservableʯ

Slide 26

Slide 26 text

Hot / Cold ͷ ݟ෼͚ํ

Slide 27

Slide 27 text

ݟ෼͚ํ ͦͷ1 Subject͸HotͰ͋Δ

Slide 28

Slide 28 text

Subject • PublishSubject • BehaviorSubject • ReplaySubject ͜ΕΒ͸HotͰ͋Δ

Slide 29

Slide 29 text

ݟ෼͚ํ ͦͷ2 ΄ͱΜͲͷOperator͸ ColdͰ͋Δ

Slide 30

Slide 30 text

Hotʹؔ࿈͢ΔΦϖϨʔλ Hotʹؔ࿈͢ΔΦϖϨʔλ͸ҎԼͷΈɻ ͜ΕΒ͕ಛʹݺ͹Εͯͳ͚Ε͹Hotʹม׵͞ΕΔ͜ͱ΋ͳ͍ɻ • multicast / publish • replay / replayAll • connect / refCount • share / shareReplay • shareReplayLatestWhileConnected

Slide 31

Slide 31 text

SubjectͳͷͰHot

Slide 32

Slide 32 text

Map Operator͸Cold

Slide 33

Slide 33 text

Filter Operator͸Cold

Slide 34

Slide 34 text

Subject Map Filter ↑ Α͘Έ͔͚Δਤ

Slide 35

Slide 35 text

ݟ෼͚ํ·ͱΊ • Subject͸ Hot • Operator͸ ΄ͱΜͲ͕ Cold • publishͳͲҰ෦ͷOperator͸ Hot (ʹؔ࿈)

Slide 36

Slide 36 text

ͰɺHot / Cold ͬͯͳʹʁ

Slide 37

Slide 37 text

͓·ͨͤ͠·ͨ͠ Hot / Coldͷੑ࣭

Slide 38

Slide 38 text

Question1 ͳΜͱදࣔ͞ΕΔͰ͠ΐ͏ʁ

Slide 39

Slide 39 text

No content

Slide 40

Slide 40 text

Answer ਖ਼ղ͸…

Slide 41

Slide 41 text

A. ͳʹ΋දࣔ͞Εͳ͍

Slide 42

Slide 42 text

Coldͷੑ࣭ ͦͷ1 ColdͳObservable͸ subscribe͞ΕΔ·Ͱ ಈ࡞͠ͳ͍

Slide 43

Slide 43 text

Cold͸subscribe͞ΕΔ·Ͱಈ࡞͠ͳ͍ Sequence

Slide 44

Slide 44 text

Cold͸subscribe͞ΕΔ·Ͱಈ࡞͠ͳ͍ Sequence Map

Slide 45

Slide 45 text

Cold͸subscribe͞ΕΔ·Ͱಈ࡞͠ͳ͍ ୭΋subscribe͍ͯ͠ͳ͍ → ಈ࡞͠ͳ͍

Slide 46

Slide 46 text

͡Ό͋subscribeͨ͠Βʁ

Slide 47

Slide 47 text

͡Ό͋subscribeͨ͠Βʁ

Slide 48

Slide 48 text

Hotͷੑ࣭ ͦͷ1 HotͳObservable͸ subscribe͞Εͳͯ͘΋ ಈ࡞͢Δ ٯʹ

Slide 49

Slide 49 text

Question2 ͳΜͱදࣔ͞ΕΔͰ͠ΐ͏ʁ

Slide 50

Slide 50 text

No content

Slide 51

Slide 51 text

Answer ਖ਼ղ͸…

Slide 52

Slide 52 text

A. ͳʹ΋දࣔ͞Εͳ͍

Slide 53

Slide 53 text

ղઆ Subject Map

Slide 54

Slide 54 text

ղઆ Subject Map

Slide 55

Slide 55 text

• ಈ࡞͠ͳ͍ = ड͚औΔ͜ͱ͢Β͠ͳ͍ Cold͸subscribe͞ΕΔ·Ͱಈ࡞͠ͳ͍ Subject Map Subject͸஋Λྲྀ͢ ड͚औΒͳ͍

Slide 56

Slide 56 text

Question3 ͳΜͱදࣔ͞ΕΔͰ͠ΐ͏ʁ

Slide 57

Slide 57 text

No content

Slide 58

Slide 58 text

Answer ਖ਼ղ͸…

Slide 59

Slide 59 text

A. 1, 2, 3

Slide 60

Slide 60 text

ղઆ Subject Map Hot

Slide 61

Slide 61 text

Hot͸લͷColdΛՔಇͤ͞Δ ͱॻ͘ͱ೉ͦ͠͏͕ͩɺཁ͸ HotͳObservable͸தͰsubscribeΛݺΜͰΔ͚ͩɻ Subject Map Hot subscribe Քಇ

Slide 62

Slide 62 text

͜͜·Ͱͷ·ͱΊ • Cold ͳObservable͸subscribe͞ΕΔ·Ͱಈ࡞͠ͳ͍ • Hot ͳObservable͸subscribe͞Εͳͯ͘΋ಈ࡞͢Δ • Hot ͳObservable͸લͷCold ΛՔಇͤ͞Δ

Slide 63

Slide 63 text

Hot ͷ΋͏Ұͭେ͖ͳੑ࣭

Slide 64

Slide 64 text

Hotͷੑ࣭ ͦͷ2 HotͳObservable͸ ෼ذͰ͖Δ

Slide 65

Slide 65 text

Coldͷੑ࣭ ͦͷ2 ColdͳObservable͸ ෼ذͰ͖ͳ͍ ٯʹ

Slide 66

Slide 66 text

෼ذͰ͖Δͱ͸ʁ • ෼ذͰ͖Δ = ObserverΛෳ਺࣋ͯΔ • Cold ͳObservable͸ObserverΛ1͔ͭ࣋ͯ͠ͳ͍ • Hot ͳObservable͸ObserverΛෳ਺࣋ͯΔ ※ આ໌؆ུԽͷͨΊʹʮObserverʯͱ͍ͯ͠·͕͢ɺ΋ͪΖΜ͜͜· ͰͷྫͷΑ͏ʹ෼ذޙʹObservableΛͭͳ͛ͯߦ͘͜ͱ΋Ͱ͖·͢ɻ

Slide 67

Slide 67 text

͑ʁෳ਺࣋ͯͳ͍ͷʁ

Slide 68

Slide 68 text

͑ʁෳ਺࣋ͯͳ͍ͷʁ

Slide 69

Slide 69 text

͑ʁෳ਺࣋ͯͳ͍ͷʁ ͳΜ͔Ͱ͖ͦ͏ͳงғؾ͋Δ͚Ͳʁʁʁ

Slide 70

Slide 70 text

Sequence Map

Slide 71

Slide 71 text

Sequence Map Observer 1ͭΊ͕subscribe

Slide 72

Slide 72 text

Sequence Map Observer Map Observer 2ͭΊ΋subscribe͍͚ͨ͠Ͳ ͢Ͱʹ1ͭ͞ΕͯΔ…

Slide 73

Slide 73 text

Sequence Map Observer Map Observer

Slide 74

Slide 74 text

Sequence Map Observer Sequence Map Observer

Slide 75

Slide 75 text

Sequence Map Observer Sequence Map Observer ετϦʔϜ͕2ຊʹ !!

Slide 76

Slide 76 text

ͦͷ݁ՌͲ͏ͳΔ͔

Slide 77

Slide 77 text

ͦͷ݁ՌͲ͏ͳΔ͔

Slide 78

Slide 78 text

ͦͷ݁ՌͲ͏ͳΔ͔ Sequence Map Observer Sequence Map Observer 2ετϦʔϜ෼ग़ྗ͞ΕΔ

Slide 79

Slide 79 text

Hotͷ৔߹ Hotʹ͢Δ(·ͩಈ࡞͸͠ͳ͍) (ৄࡉ͸Hotม׵ͷͱ͖ʹઆ໌)

Slide 80

Slide 80 text

Hotͷ৔߹

Slide 81

Slide 81 text

Hotͷ৔߹ ͜͜ͰετϦʔϜ։࢝ (ৄࡉ͸Hotม׵ͷͱ͖ʹઆ໌)

Slide 82

Slide 82 text

Hotͷ৔߹ Sequence Map Hot

Slide 83

Slide 83 text

Hotͷ৔߹ Sequence Map Hot Observer 1ͭΊ͕subscribe

Slide 84

Slide 84 text

Hotͷ৔߹ Sequence Map Hot Observer Observer 2ͭΊ΋subscribe

Slide 85

Slide 85 text

Hotͷ৔߹ Sequence Map Observer Hot Observer

Slide 86

Slide 86 text

Hotͷ৔߹ Sequence Map Observer Hot Observer ෼ذ !!!

Slide 87

Slide 87 text

ͦͷ݁ՌͲ͏ͳΔ͔

Slide 88

Slide 88 text

ͦͷ݁ՌͲ͏ͳΔ͔

Slide 89

Slide 89 text

ͦͷ݁ՌͲ͏ͳΔ͔ Sequence Map Observer Hot Observer Ұճ෼͔͠print͞Εͳ͍

Slide 90

Slide 90 text

͜͜·Ͱͷ·ͱΊ • Cold ͳObservable͸෼ذͰ͖ͳ͍ • Hot ͳObservable͸෼ذͰ͖Δ

Slide 91

Slide 91 text

Hot ͷ࠷ޙͷੑ࣭

Slide 92

Slide 92 text

Question4 ͳΜͱදࣔ͞ΕΔͰ͠ΐ͏ʁ

Slide 93

Slide 93 text

͜͜ͰετϦʔϜ։࢝ (ৄࡉ͸Hotม׵ͷͱ͖ʹઆ໌) Hotʹ͢Δ(·ͩಈ࡞͸͠ͳ͍)

Slide 94

Slide 94 text

Answer ਖ਼ղ͸…

Slide 95

Slide 95 text

A. 2, 4, 6

Slide 96

Slide 96 text

͋Εʁ 2ճsubscribeͯ͠Δͷʹʁ

Slide 97

Slide 97 text

Hotͷੑ࣭ ͦͷ3 HotͳObservableͷΠϕϯτ͸ ֤ObserverͰڞ༗͞ΕΔ

Slide 98

Slide 98 text

͢ΔͱͲ͏ͳΔ͔ • ֤Observerʹରͯ͠ಉ͡Πϕϯτ͕ૹग़͞ΕΔɻͭ· Γͦ͜·ͰͷCold͸Կ౓΋ݺ͹Εͳ͍ɻ(෼ذͷੑ࣭ ͱ͜ΖͰ֬ೝࡁΈ) • ͢ͰʹྲྀΕͨΠϕϯτ(Next)͸ૹग़͞Εͳ͍ɻͭ·Γ ్த͔Βsubscribe͢Δͱ్த͔Β͔͠ड͚औΕͳ͍ɻ

Slide 99

Slide 99 text

ղઆ ετϦʔϜՔಇ։࢝࣌఺Ͱ observer͸1ͭ

Slide 100

Slide 100 text

ղઆ 2,4,6 ͕දࣔ͞ΕΔ

Slide 101

Slide 101 text

ղઆ ͜͜ʹࢸͬͨ࣌఺ͰશͯͷNext͸͢Ͱʹૹग़ࡁΈɻ ࠶౓ྲྀΕΔ͜ͱ͸ͳ͍ɻ

Slide 102

Slide 102 text

ղઆ Αͬͯɺͳʹ΋දࣔ͞Εͳ͍

Slide 103

Slide 103 text

ղઆ

Slide 104

Slide 104 text

͡Ό͋Coldͷ৔߹͸ʁ

Slide 105

Slide 105 text

͡Ό͋Coldͷ৔߹͸ʁ Sequence Map Observer Sequence Map Observer

Slide 106

Slide 106 text

͡Ό͋Coldͷ৔߹͸ʁ ͢Ͱʹղઆͨ͠௨ΓɺετϦʔϜࣗମ͕2ͭʹͳΔɻ ͳͷͰɺ྆ํͷObserverͰ࠷ॳͷΠϕϯτ͔Β͢΂ͯ ड͚औΔ͜ͱ͕Ͱ͖Δɻ Sequence Map Observer Sequence Map Observer

Slide 107

Slide 107 text

͡Ό͋Coldͷ৔߹͸ʁ

Slide 108

Slide 108 text

ੑ࣭·ͱΊ

Slide 109

Slide 109 text

Coldͷੑ࣭ ͦͷ1 ColdͳObservable͸ subscribe͞ΕΔ·Ͱ ಈ࡞͠ͳ͍

Slide 110

Slide 110 text

Hotͷੑ࣭ ͦͷ1 HotͳObservable͸ subscribe͞Εͳͯ͘΋ ಈ࡞͢Δ ٯʹ

Slide 111

Slide 111 text

Hotͷੑ࣭ ͦͷ2 HotͳObservable͸ ෼ذͰ͖Δ

Slide 112

Slide 112 text

Coldͷੑ࣭ ͦͷ2 ColdͳObservable͸ ෼ذͰ͖ͳ͍ ٯʹ

Slide 113

Slide 113 text

Hotͷੑ࣭ ͦͷ3 HotͳObservableͷΠϕϯτ͸ ֤ObserverͰڞ༗͞ΕΔ

Slide 114

Slide 114 text

Ҏ্ʂ

Slide 115

Slide 115 text

࠷ޙʹ • ͜͜·Ͱઆ໌ͨ͠ͷ͸͋͘·Ͱ΋֓೦తͳ࿩ Ͱ͢ɻͲ͜Ͱͳʹ͕ى͍ͬͯ͜Δ͔ΛͪΌΜ ͱཧղ͢Δʹ͸ɺ΍͸Γ࣮૷Λ͕Μ͹ͬͯಡ ΜͰ͍ͩ͘͞ɻ(ίʔυϦʔσΟϯάͷצॴ͸ ผ్ൃද͠·͢ɻ) • Hotม׵ʹ͍ͭͯ΋ผ్ղઆ͠·͢ɻ