APIのデータのマッピングを 約18倍速くした話

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1. APIͷσʔλͷϚοϐϯάΛ
   ໿18ഒ଎ͨ͘͠࿩
   potatotips #48
   @magie_pooh
   

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2. ࣗݾ঺հ
   ౻ాୖຏ
   @magie_pooh
   @magiepooh
   झຯɾಛٕ:

   ΫϥϑτϏʔϧɾ೔ຊञɾϚδοΫɾ࠵຾
   

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3. ͱ͋ΔΞϓϦͷ։ൃத
   • ը໘ભҠ͕஗͍୺຤͕͋Δͳʔͱࢥͬͨ
   

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4. ͱ͋ΔΞϓϦͷ։ൃத
   • ը໘ભҠ͕஗͍୺຤͕͋Δͳʔͱࢥͬͨ
   • Nexus5Xͱ͔Ͱ਺ඵ
   

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5. ͱ͋ΔΞϓϦͷ։ൃத
   • ը໘ભҠ͕஗͍୺຤͕͋Δͳʔͱࢥͬͨ
   • Nexus5Xͱ͔Ͱ਺ඵ
   • SO-04G (5.0.2)Ͱը໘ભҠʹ20sec͘Β͍ɾɾ
   

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7. ঢ়گ
   • Wi-Fi઀ଓ؀ڥ
   • σʔλ͸JSONܗࣜ
   • αΠζ͸1MB
   • Kotlin + Moshi(=A modern JSON library for
   Android and Java)
   

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8. ରࡦ
   

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9. ରࡦ1ɿMoshi͕ѱ͍ͷͰ͸ʁ
   • moshi(moshi-kotlin: Square੡JSONύʔα)͸ϦϑϨΫγϣϯ
   Λ༻͍͍ͯΔͨΊɺίετ͕ߴ͍
   • KotshiΛ࢖͏
   • An annotations processor that generates Moshi adapters
   from immutable Kotlin data classes.
   • https://github.com/ansman/kotshi
   

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10. ରࡦ1ɿMoshi͕ѱ͍ͷͰ͸ʁ
    • moshi(moshi-kotlin: Square੡JSONύʔα)͸ϦϑϨΫγϣϯ
    Λ༻͍͍ͯΔͨΊɺίετ͕ߴ͍
    • KotshiΛ࢖͏
    • An annotations processor that generates Moshi adapters
    from immutable Kotlin data classes.
    • https://github.com/ansman/kotshi
    => 20sec -> 12sec
    

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11. ରࡦ2ɿΦϒδΣΫτੜ੒͕ଟ͗͢Δ໰୊
    • ഑ྻͷதʹΦϒδΣΫτ͕େྔʹଘࡏ͍ͯͨ͠
    {
    “hogeArray”: [
    {“obj”: {123, 456.2}},…
    ]
    }
    

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12. ରࡦ2ɿΦϒδΣΫτੜ੒͕ଟ͗͢Δ໰୊
    • ഑ྻͷதʹΦϒδΣΫτ͕େྔʹଘࡏ͍ͯͨ͠
    => ΦϒδΣΫτ͡Όͳ͘ɺStringܕͷ഑ྻͷ഑ྻͰදݱ͢Δ
    {
    “hogeArray”: [
    {“obj”: {123, 456.2}},…
    ]
    }
    {
    “hogeArray”: [
    [“123”, “456.2”],…
    ]
    }
    

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13. ରࡦ2ɿΦϒδΣΫτੜ੒͕ଟ͗͢Δ໰୊
    • ഑ྻͷதʹΦϒδΣΫτ͕େྔʹଘࡏ͍ͯͨ͠
    => ΦϒδΣΫτ͡Όͳ͘ɺStringܕͷ഑ྻͷ഑ྻͰදݱ͢Δ
    {
    “hogeArray”: [
    {“obj”: {123, 456.2}},…
    ]
    }
    {
    “hogeArray”: [
    [“123”, “456.2”],…
    ]
    }
    => 12sec -> 8.4secʢ഑ྻσʔλ͕ͦ΋ͦ΋ڊ
    େͩͬͨͨΊɺ͔ͳΓ͕ࠩग़ͨʣ
    

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14. ରࡦ3: APIఆٛΛݟ௚͢
    • ഑ྻσʔλΛ̍ͭʹڞ௨ԽͰ͖Δɾɾɾʂ
    • ॏෳͨ͠഑ྻσʔλΛ4ͭड͚औ͍ͬͯͨ
    => 8.4sec -> 2.9sec
    

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15. ·ͱΊ1
    • ΄΅Kotshiͷ͓͔͕͛ͩɺ20sec -> 2.9secʹͳͬͨ
    • େྔͷ഑ྻσʔλʹܕΛ͚ͭΔͷ͸Α͘ͳ͍
    • ʮͦͷ೔ɺਓྨ͸ࢥ͍ग़ͨ͠ɻ୺຤ؒͷύϑΥʔϚϯεࠩҟ
    ͷڪාΛɻͦΕͰ΋αϙʔτ͠ͳ͚Ε͹͍͚ͳ͍۶ৱΛɻʯ
    • SO-04G (5.0.2): ໿ 2.9sec
    • SO-02G (4.4.4): ໿ 0.64sec
    

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16. ·ͱΊ2
    • iOSͰ͸ͦ͜·Ͱύʔεʹ͕͔͔࣌ؒͬͯͳ͔ͬͨͷ͕ٙ໰
    • ΋͔ͯ͠͠ݹ͍୺຤ͩͱ͕͔͔࣌ؒΔʁ
    • ը໘ભҠΞχϝʔγϣϯ(Shared Element Transition)͕͋Δͱɺ
    2.9secͰ΋஗͘ײ͡ͳ͍
    • ͦΕͰ΋ɺ2.9sec͔͔Δͷ͕ݏͩͬͨͷͰɺେྔͷ഑ྻͷऔಘ͸
    ผAPIʹ੾Γग़ͨ͠ɻʢͦΕͰ1.2sec͘Β͍·ͰॖΊͯ18ഒͷύ
    ϑΥʔϚϯεվળୡ੒ɾɾʣ
    

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