今日こそ理解するHot / Cold @社内RxSwift勉強会

Transcript

1. ࠓ೔ͦ͜ཧղ͢Δ
   Hot / Cold
   @ࣾ಺RxSwiftษڧձ
   

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2. RxͰΈͳ࠷ॳʹͭ·ͮ͘
   ϙΠϯτ
   

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4. Hot / Cold
   

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

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6. ࡾᵆ( ^o^)ᵒ
   

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7. ࡾᵆ( ^o^)ᵒ
   ※ Bond͸ྑ͍ϥΠϒϥϦͰ͢
   

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

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

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

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11. લఏ஌ࣝ
    

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12. લఏ஌ࣝ ͦͷ1
    Hot / Cold ͸
    ʮObservableʯͷੑ࣭
    

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13. ͳʹΛ౰ͨΓલͷࣄΛ
    ݴ͍ͬͯΔΜͩίΠπ
    

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14. ͡Ό͋ͳʹ͕Observable͔
    

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15. ͡Ό͋ͳʹ͕Observable͔
    • Subject
    • PublishSubject, BehaviorSubject, ReplaySubject …
    

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

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

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18. લఏ஌ࣝ ͦͷ2
    ֤छOperator (Λද͢Ϋϥε)
    ͸
    ʮObservableʯͰ͋Δ
    

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19. filter
    

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20. filter
    ฦΓ஋ͷܕ͸Observable
    

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21. filter
    ࣮ଶ͸filter operatorΛද͢
    Filterͱ͍͏Ϋϥε
    

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22. just
    

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23. just
    ฦΓ஋ͷܕ͸Observable
    

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24. just
    ࣮ଶ͸Justͱ͍͏Ϋϥε
    

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

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26. Hot / Cold ͷ ݟ෼͚ํ
    

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27. ݟ෼͚ํ ͦͷ1
    Subject͸HotͰ͋Δ
    

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28. Subject
    • PublishSubject
    • BehaviorSubject
    • ReplaySubject
    ͜ΕΒ͸HotͰ͋Δ
    

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29. ݟ෼͚ํ ͦͷ2
    ΄ͱΜͲͷOperator͸
    ColdͰ͋Δ
    

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

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31. SubjectͳͷͰHot
    

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32. Map Operator͸Cold
    

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33. Filter Operator͸Cold
    

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34. Subject Map Filter
    ↑ Α͘Έ͔͚Δਤ
    

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

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36. ͰɺHot / Cold ͬͯͳʹʁ
    

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37. ͓·ͨͤ͠·ͨ͠
    Hot / Coldͷੑ࣭
    

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38. Question1
    ͳΜͱදࣔ͞ΕΔͰ͠ΐ͏ʁ
    

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40. Answer
    ਖ਼ղ͸…
    

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41. A. ͳʹ΋දࣔ͞Εͳ͍
    

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42. Coldͷੑ࣭ ͦͷ1
    ColdͳObservable͸
    subscribe͞ΕΔ·Ͱ
    ಈ࡞͠ͳ͍
    

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43. Cold͸subscribe͞ΕΔ·Ͱಈ࡞͠ͳ͍
    Sequence
    

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44. Cold͸subscribe͞ΕΔ·Ͱಈ࡞͠ͳ͍
    Sequence Map
    

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

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46. ͡Ό͋subscribeͨ͠Βʁ
    

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47. ͡Ό͋subscribeͨ͠Βʁ
    

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48. Hotͷੑ࣭ ͦͷ1
    HotͳObservable͸
    subscribe͞Εͳͯ͘΋
    ಈ࡞͢Δ
    ٯʹ
    

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49. Question2
    ͳΜͱදࣔ͞ΕΔͰ͠ΐ͏ʁ
    

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51. Answer
    ਖ਼ղ͸…
    

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52. A. ͳʹ΋දࣔ͞Εͳ͍
    

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53. ղઆ
    Subject Map
    

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54. ղઆ
    Subject Map
    

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

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56. Question3
    ͳΜͱදࣔ͞ΕΔͰ͠ΐ͏ʁ
    

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58. Answer
    ਖ਼ղ͸…
    

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59. A. 1, 2, 3
    

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60. ղઆ
    Subject Map Hot
    

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

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

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63. Hot ͷ΋͏Ұͭେ͖ͳੑ࣭
    

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64. Hotͷੑ࣭ ͦͷ2
    HotͳObservable͸
    ෼ذͰ͖Δ
    

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65. Coldͷੑ࣭ ͦͷ2
    ColdͳObservable͸
    ෼ذͰ͖ͳ͍
    ٯʹ
    

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

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67. ͑ʁෳ਺࣋ͯͳ͍ͷʁ
    

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68. ͑ʁෳ਺࣋ͯͳ͍ͷʁ
    

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69. ͑ʁෳ਺࣋ͯͳ͍ͷʁ
    ͳΜ͔Ͱ͖ͦ͏ͳงғؾ͋Δ͚Ͳʁʁʁ
    

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70. Sequence Map
    

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71. Sequence Map Observer
    1ͭΊ͕subscribe
    

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72. Sequence Map Observer
    Map Observer
    2ͭΊ΋subscribe͍͚ͨ͠Ͳ
    ͢Ͱʹ1ͭ͞ΕͯΔ…
    

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73. Sequence Map Observer
    Map Observer
    

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74. Sequence Map Observer
    Sequence Map Observer
    

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75. Sequence Map Observer
    Sequence Map Observer
    ετϦʔϜ͕2ຊʹ !!
    

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76. ͦͷ݁ՌͲ͏ͳΔ͔
    

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77. ͦͷ݁ՌͲ͏ͳΔ͔
    

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78. ͦͷ݁ՌͲ͏ͳΔ͔
    Sequence Map Observer
    Sequence Map Observer
    2ετϦʔϜ෼ग़ྗ͞ΕΔ
    

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

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80. Hotͷ৔߹
    

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81. Hotͷ৔߹
    ͜͜ͰετϦʔϜ։࢝
    (ৄࡉ͸Hotม׵ͷͱ͖ʹઆ໌)
    

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82. Hotͷ৔߹
    Sequence Map Hot
    

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83. Hotͷ৔߹
    Sequence Map Hot Observer
    1ͭΊ͕subscribe
    

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

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85. Hotͷ৔߹
    Sequence Map
    Observer
    Hot
    Observer
    

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

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87. ͦͷ݁ՌͲ͏ͳΔ͔
    

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88. ͦͷ݁ՌͲ͏ͳΔ͔
    

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89. ͦͷ݁ՌͲ͏ͳΔ͔
    Sequence Map
    Observer
    Hot
    Observer
    Ұճ෼͔͠print͞Εͳ͍
    

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

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91. Hot ͷ࠷ޙͷੑ࣭
    

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92. Question4
    ͳΜͱදࣔ͞ΕΔͰ͠ΐ͏ʁ
    

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

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94. Answer
    ਖ਼ղ͸…
    

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95. A. 2, 4, 6
    

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96. ͋Εʁ 2ճsubscribeͯ͠Δͷʹʁ
    

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97. Hotͷੑ࣭ ͦͷ3
    HotͳObservableͷΠϕϯτ͸
    ֤ObserverͰڞ༗͞ΕΔ
    

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

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99. ղઆ
    ετϦʔϜՔಇ։࢝࣌఺Ͱ
    observer͸1ͭ
    

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100. ղઆ
     2,4,6 ͕දࣔ͞ΕΔ
     

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101. ղઆ
     ͜͜ʹࢸͬͨ࣌఺ͰશͯͷNext͸͢Ͱʹૹग़ࡁΈɻ
     ࠶౓ྲྀΕΔ͜ͱ͸ͳ͍ɻ
     

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102. ղઆ
     Αͬͯɺͳʹ΋දࣔ͞Εͳ͍
     

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103. ղઆ
     

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104. ͡Ό͋Coldͷ৔߹͸ʁ
     

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105. ͡Ό͋Coldͷ৔߹͸ʁ
     Sequence Map Observer
     Sequence Map Observer
     

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

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107. ͡Ό͋Coldͷ৔߹͸ʁ
     

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108. ੑ࣭·ͱΊ
     

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109. Coldͷੑ࣭ ͦͷ1
     ColdͳObservable͸
     subscribe͞ΕΔ·Ͱ
     ಈ࡞͠ͳ͍
     

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110. Hotͷੑ࣭ ͦͷ1
     HotͳObservable͸
     subscribe͞Εͳͯ͘΋
     ಈ࡞͢Δ
     ٯʹ
     

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111. Hotͷੑ࣭ ͦͷ2
     HotͳObservable͸
     ෼ذͰ͖Δ
     

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112. Coldͷੑ࣭ ͦͷ2
     ColdͳObservable͸
     ෼ذͰ͖ͳ͍
     ٯʹ
     

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113. Hotͷੑ࣭ ͦͷ3
     HotͳObservableͷΠϕϯτ͸
     ֤ObserverͰڞ༗͞ΕΔ
     

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114. Ҏ্ʂ
     

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

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