Revamping 6 apps in 8 months

극한직업: 6개의 legacy Android / iOS 앱을 8개월만에 리뉴얼 한 이야기 (+ 최근의 모바일 기술에 대한 소감: 아키텍처(MVP, MVVM), 언어(Swift, Kotlin), 기타(Rx, DI, ..))

Transcript

1. ӓೠ૒স: 6ѐ੄ LEGACY ANDROID / IOS জ
   ਸ 8ѐਘ݅ী ܻ׏঴ ೠ ੉ঠӝ
   ઁ25ର KODEVELOPER Ҋҵ࠙ైӝ
   

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2. 0. ࢲۿ
   WHO IS THIS GUY?
   ▸ 18֙ର ಽझఖ ূ૑פয (ߔূ٘ 10֙ / ݽ߄ੌ 6.5֙ / ਢ೐ۿ౟ূ٘ 1֙)
   ▸ ತস ੹ޙо: ޷Ҵীࢲ ೠ ߣ, ೠҴীࢲ ف ߣ झఋ౟স ೮׮ ݈ইݡ਺
   ▸ ӝ۞ӝ ইࡅ: ೠҴী ইղ৬ ف ইٜҗ ъই૑৬ Ҋন੉ܳ فҊ ੓਺
   ▸ Senior SW Engineer @ Nextbeat
   ▸ 11/15 ࠗఠ IBMer
   

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3. 0. ࢲۿ
   ࠺ӓ੄ द੘: աח যڌѱ উ٘۽੉٘ ূ૑פযо غ঻חо?
   • যוզ ੉ࢎש੉ աܳ ઑਊ൤ ࣑ࠗܰ׮...
   

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4. ੗֎...
   ੗߄ ೡ ઴ ঌ૑?
   Dilbert © 2018, Andrews McMeel Syndication
   

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5. উ٘۽੉٘ য೒
   ખ ٜ݅য ࠊ.
   ֎?!
   औѱ ೡ ࣻ ੓ਗ਼ই.
   Dilbert © 2018, Andrews McMeel Syndication
   

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6. PHASE 1. BABY SITTER APP
   ౠ૚
   ▸ ই੉ܳ ݐӝҊ र਷ ࠗݽ৬ ੹ޙ ߬੉࠺ दఠܳ োѾ೧઱ח C2C ࢲ࠺झ
   ▸ ೞա੄ জীࢲ ࠁഐ੗ ݽ٘ / दఠ ݽ٘ܳ ݽف ૑ਗ
   ▸ ࢚׼൤ ݆਷ ചݶ ন, ചݶ ൒ܴ੉ ࠂ੟ೠ दաܻয়о ݆਺
   ▸ ݒ୹੉ ֫૑ח ঋਵա ࣗঘ Ѿઁо ݒ਋ ݆ই Ѿઁ੄ উ੿ࢿ੉ ݒ਋ ઺ਃ
   

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7. PHASE 1. BABY SITTER APP
   PROBLEM: TOTAL CHAOS
   ▸ 30% ੿ب ٜ݅য૓ ࢚కীࢲ ઱פয ূ૑פয 1ݺҗ ೣԋ ైੑ
   ▸ ୭ঈ੄ ௏٘ ಿ૕: ҃೷੉ ࠗ઒ೠ ୡब੗о ੿ࢿਸ ٜ੉૑ ঋҊ ૠ ௏٘
   ▸ ੋࣻੋ҅ ੹ޖ: ੹੐੗ 3ݺ(Android সޖਤఌ 1, iOS 1, ࢲߡ 1)੉ ކٶ ృࢎೠ ࢚క
   ▸ উ੿ࢿ: ࢎনࢲ ؀۽੄ بࢶ਷ ز੘਷ ೞחؘ ઑӘ݅ ߩযաݶ জ੉ ߄۽ ௼ېद..
   ▸ ੤അߑߨ(੤അਯ 100%): ࡅܲ ࣘب۽ చਸ ੹ജ, API ഐ୹ ب઺ জਸ ࠺ഝࢿച, ࢎনࢲ৬
   ׮ܲ بࢶਵ۽ ഥਗоੑ दب, …
   ▸ ޖܻೠ ੌ੿: iOS োղ ୹द, Android 2018֙ 1ਘ ࣇ૩઱ ୹द (ଵҊ۽.. ੑࢎੌ: 10/16)
   

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9. PHASE 1. BABY SITTER APP
   CHALLENGE: ASYNCHRONOUS
   ▸ উ٘۽੉٘੄ উ੿ࢿ ޙઁ੄ ਗੋ: ࠺زӝ ୊ܻীࢲ ৘৻࢚ടী ؀ೠ ୊ܻо ੹ޖ
   ▸ iOS੄ ҃਋ উ੿ࢿ ޙઁח ੸ਵա ࢿמ ੉गо ੓঻਺
   ▸ ৵ ݽ߄ੌীࢲ ࠺زӝ ୊ܻо ઺ਃೠо?
   ▸ Frame lag - 60Hz: 16ms / 90Hz, 12 ms / 120Hz, 8 ms
   ▸ Android੄ ҃਋: ANR (App Not-Responding) problem
   

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10. PHASE 1. BABY SITTER APP
    CHALLENGE: OLD LANGUAGE
    ▸ iOSח Swift 2.x۽, Androidח Java۽ ѐߊغҊ ੓ח ࢚క
    ▸ নଃ ݽف ੗ز ߸ജోਸ ઁҕ, but..
    ▸ Kotlin਷ ޷ޑೠ ޙઁо..
    ▸ Null ୊ܻ۽ ੋ೧ ੹ഃ ৘࢚ ޅೠ Ҕীࢲ crashо ߊࢤೡ ࣻ ੓ח ૑܉ߒ 

    eg. ੤੘֙ Nࢎীࢲ ੓঻؍ জ ੢গ
    ▸ ೧Ѿ଼਷ ୥୥ೠ Testੋؘ.. native SAM(Single Abstract Methods) ޷૑ਗ,
    Parametric polymorphism ޷૑ਗ ١ ࣻ੘স੉ ೙ਃೠ ࠗ࠙ ٸޙী Java ӝ߈ test੄
    migrationী ࠗ׸੉ ੓਺
    

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11. PHASE 1. BABY SITTER APP
    CHALLENGE: MVC ARCHITECTURE
    ▸ MVC: View ੿੄, Controller ௏٘, Business ۽૒, Model ࠗ࠙੉ ࢎ੉જѱ য਋۞૓ դ੢
    ౸..
    

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12. MVC is not evil
    • Modelҗ Viewח ੌઙ੄ ۨҊ ࠶۟: Model(+
    Domain) ҅கীࢲח ࠺ૉפझ ۽૒ਸ, View
    ח UI۽૒ਸ ઁҕ.
    
    • Controllerח ۨҊ ࠶۟੄ ઑ݀ਸ ׸׼.
    
    • Cח যڃ Viewܳ ࠁৈ઴ Ѫੋоܳ Ѿ੿೧ࢲ
    Modelীࢲ ߉਷ ؘ੉ఠܳ View۽ ֈѹષ.
    
    • ӒܻҊ ী۞ܳ যڌѱ ࠁৈ઴૑ܳ Ѿ੿೧ࢲ
    View۽ ֈѹષ
    

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13. ৵ Mobile MVCח աࢂо?
    • ݽ߄ੌ ജ҃੄ ޙઁ: ࠂ੟ೠ ࠺زӝ ୊ܻ, ۄ੉೐ ࢎ੉௿ ୊ܻ
    
    • iOS/উ٘۽੉٘੄ ӝࠄ ইఃఫ୊ ޙઁ: View - Controller ܻ࠙о গݒೞ׮.
    
    • Fat Activity: Activity-Fragmentী ցޖ ݆਷ ۽૒੉ ٜযр׮.
    
    • Unit Testܳ ٜ݅ӝо ݒ਋ ө׮܂׮.
    
    • Ӓ Ѿҗ == ୨୓੸ դҴ
    
    • Separation of Concern ੉ উ ؽ: য٣ী ޤо ੓ח૑ ࠄੋب ଺ӝо ൨ٜয ૗
    
    • ೞաೞա੄ ௿ېझٜ੉ ցޖ ݆਷ ৉ೡਸ ׸׼ -> ਬ૑ࠁࣻ ਊ੉ࢿ, ࣻ੿ಞ੄ࢿ, о
    ةࢿ ١ ݆਷ ࠗ࠙ীࢲ ஂডೠ ௏٘о غߡܿ
    

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14. SOLUTION
    

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15. PHASE 1. BABY SITTER APP
    SOLUTION
    ▸ Franklin’s rule
    ▸ ࢶఖҗ ૘઺: ઺ਃೞ૑ ঋ਷ ੌ਷ ݽف ನӝ
    ▸ Remove Innovation: ܻझ௼ܳ ୭؀ೠ ഥೖ, যڃ ࢜۽਍ दبب ೞ૑ ঋח׮
    ▸ ࢲߡ੄ ࣻ੿/ࠛ೤ܻೠ API झಖ੄ ࣻ੿ب (ੌࠗ ߡӒо ੓ח ࠗ࠙ਸ ઁ৻ೞݶ) ನӝ
    ▸ әೞ૑ ঋ૑݅ ઺ਃೠ दрী Բળ൤ दр ై੗
    ▸ ೱറ ֫਷ ੉੗੄ ӝࣿࠗ଻о ؼ оמࢿ੉ ੓ח ࠗ࠙਷ ઺р઺р ೧Ѿ
    ▸ ੌױ ా೤పझ౟ ನӝ(தࠁ٣ই੄ QA ഥࢎ۽ ೧Ѿ)ೞغ ઺р઺р ઱ਃ ۽૒ పझ౟ ҳഅ
    

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16. әೠ ੌ әೞ૑ ঋ਷ ੌ
    ઺ਃೠ
    ੌ
    ׼ো൤.. न ӝמ ҳഅ
    
    ߡӒ ࣻ੿ + জ উ੿ച
    MV-Presenter ੹ജ
    
    য়ېػ ۄ੉࠳۞ܻ тইఋӝ
    ઺ਃೞ
    ૑ ঋ਷
    ੌ
    пઙ ഥ੄ ଵࢳ -> ݽٚ ੿۹޷౴
    ࠛଵ
    ੉࢚ೠ ߸ࣻݺ, ݫࣗ٘ݺ ߸҃
    
    ٜৈॳӝ ߸҃
    
    ӝఋ झఋੌ ࣻ੿
    
    Rx, DI ١ नӝࣿ بੑ
    Java -> Kotlin ߸ജ
    

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17. PHASE 1. BABY SITTER APP
    SOLUTION
    ▸ ঱য ߸ജ
    ▸ Swift੄ ҃਋, नߡ੹ਵ۽ ߄Բ૑ ঋਸ ҃਋ ۄ੉࠳۞ܻо ز੘ೞ૑ ঋח ҃਋о Ԩ ੓য ݃੉Ӓۨ੉࣌੉
    ೙ࣻ
    ▸ Kotlin਷ (Ѣ੄) 100% ೞਤ ഐജࢿਸ ઁҕೞӝ ٸޙী ࢲفܳ ೙ਃо হ਺
    ▸ ؀ࠗ࠙੄ জٜ੉ Kotlinചܳ ੸ӓ੸ਵ۽ दبೞҊ ੓਺ীب 40% ࣻળਸ ֈ૑ ޅೞҊ ੓ח ੉ਬ
    ▸ Ӓ۞ա ഛҊೠ ݫܻ౟ח ੓਺
    ▸ Ref: Kolin͹෰ᔭͫΝAndroidΧϜϯ΀ᶦ᭳ (https://speakerdeck.com/yanzm/kotlinfest)
    ▸ → नӝמ਷ Kotlinਵ۽ ੘ࢿೞغ ӝઓ ௏٘ח ࣗӓ੸ਵ۽, উ੿ࢿী ഛन੉ ੓ח ࠗ࠙݅ ࣻ੿
    

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18. PHASE 1. BABY SITTER APP
    SOLUTION
    ▸ উ੿ࢿ ޙઁ: ੸੿ ӝࣿ۽ ೧Ѿ
    ▸ ޙઁо ߊࢤೞח ٜࠗ࠙੄ ҕా ୊ܻܳ ୶࢚ച ೧ࢲ ୊ܻೞب۾ ࣻ੿
    ▸ eg. Callback ୊ܻܳ ୶࢚ചೠ ҕా ௿ېझܳ ੘ࢿ
    ▸ пઙ ৘৻/ী۞ ୊ܻܳ ੌҙغѱ ୊ܻ
    ▸ CountDownLatchܳ ੉ਊ೧ ࠂࣻ੄ async җ੿੄ ઙܐ ୊ܻب ੗زਵ۽..
    

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19. PHASE 1. BABY SITTER APP
    SOLUTION
    ▸ ҳઑ ޙઁ: MVP ଻ਊ
    ▸ 90֙؀ ઁউ, 2006֙ Martin Fowler੄ ࣗѐ۽ օܻ ঌ۰૗

    ଵઑ: GUI Architectures (https://martinfowler.com/eaaDev/uiArchs.html)
    ▸ Viewח ࠺ૉפझ ۽૒ী ҙ۲ػ ࠗ࠙ਸ ҙৈೞ૑ ޅೞب۾ ܻ࠙, Presenter۽ ֈӣ
    

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20. Presenter
    View
    Model
    ࢎਊ੗ ੑ۱ਸ ాࠁ
    ؘ੉ఠ јन ਃ୒
    ؘ੉ఠ ߸҃ ాࠁ
    ࠭ ߸҃ ਃ୒
    

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21. MVP੄ ੢੼
    • Fat activity/fragment ߑ૑
    
    • ੸੺ೠ ৉ೡ(responsibility)੄ ܻ࠙۽ ੋ೧ ࣗझ оةࢿ + ಿ૕੉ ز߈ ࢚थ
    
    • ೒ۖಬ ੄ઓ੸ੋ UI ୊ܻח View ଃਵ۽ ܻ࠙೮ӝ ٸޙী Presenterח औѱ
    పझ౟ ੘ࢿ੉ оמ
    
    • Clean Architecture৬ 1:1 mapping оמ. CAܳ Ӓ؀۽ ଻ਊೞݶ ࢸ҅ ҙ۲
    ֢۱ب ୭ࣗച
    

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22. PHASE 1. BABY SITTER APP
    Ҋҵ࠙ై੄ Ѿҗ
    ▸ 2017/12/31 नߡ੹ ୹द! (ਗې ੌ੿ 2018/1/19)
    ▸ ୐ ઱ ௼ېदਯ 5%, Ӓ റ ૑Әө૑ 0.01% ޷݅
    ▸ ୹द 1઱݅ী 1.5 ୹द
    ▸ CPO៭, “ࢤп೧ࠁפ ഥਗоੑ হ੉ח दఠ Ѩ࢝੉ উ غח ѱ ખ উ જ֎.. ীয࠺ূ࠺୊ۢ ࠺ഥਗ ݽ٘ب ખ ֍
    ૑?“ -> 4दр݅ী ؀਽ ৮ܐ
    ▸ ӒܻҊ..
    ▸ ࣻѐਘী Ѧ୛ࢲ ౥౥൤ kotlin ߸ജ ߂ MVP ੸ਊ ੘সਸ ૓೯, Ѿઁࠗ࠙ਸ ઁ৻ೞҊח Ѣ੄ ݽٚ ௏٘ kotlin
    ച
    ▸ ૑૑դ઱ী ݃૑݄ թ਷ Ѿઁ ࠗ࠙ө૑ Java ௏٘ 100% ઁѢ!
    

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23. PHASE II. ਭই੿ࠁ APP
    ౠ૚
    ▸ ੌࠄ ਭই ੿ࠁ ҙ۲ 3ਤ ࢲ࠺झ
    ▸ Retention, ୓ܨ दр੉ ݒ਋ ֫Ҋ, ౟ې೗੉ ౠ੿दрী ૘઺غח ҃ೱ੉ ੓਺
    ▸ ੉੹ ೐۽ં౟ܳ ೞݶࢲ ߄ׯ਷ ନ঻׮Ҋ ࢤп೮׮. Ӓ۞ա..
    ▸ PO៭, “য٣оࢲ ࠁৈ઱ӝ ଃ ౹۰ࢲ ҟҊب উ ೞҊ ੓যਃ..”
    

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25. PHASE II. ਭই੿ࠁ APP
    PROBLEM: TOTAL CATASTROPHE
    ▸ Hybrid ഋకੋؘ Web-native োز੉ 

    ૑੷࠙ೞӝ Ӓ૑ হ਺
    ▸ ࢸ࢚ о࢚ਵ۽ ࢲߡب PHP۽ ઁݧ؀۽ 

    ҳഅغয ੓਺
    ▸ 2 off-shore engineers joined

    → ױӝ੸ਵۿ য়൤۰ ܻझ௼ ૐо
    

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26. PHASE II. ਭই੿ࠁ APP
    SOLUTION
    ▸ ੹ݶ ੤ѐߊ
    ▸ ࢲߡө૑ ӝઓ ࣗझ ୓҅ܳ ৮੹൤ ߡܻҊ ׮द द੘
    ▸ (ӝઓ ௏٘ ߬੉झо ই઱ ௼૑ ঋওҊ, জ ஶࣆ੉ ੹୓੸ਵ۽ ࣻ੿غ঻ӝ ٸޙী оמೠ ࢶ
    ఖ੉঻਺)
    

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27. PHASE II. ਭই੿ࠁ APP
    SOLUTION
    ▸ न ҳઑ بੑ: MVVM
    ▸ ৉द ݃౯ ౵਎۞੄ Presentation Domain Separation (PDS)о दୡ
    ▸ 2004֙ ࣗѐػ Presentation Model੉ ਗഋ (https://martinfowler.com/eaaDev/
    PresentationModel.html )
    ▸ Microsoft .Net Frameworkীࢲ ୊਺ ҳഅೣ
    ▸ ViewModel: Uni-directional Mediator & Self-contained system
    ▸ Presenter৬ ݒ਋ ਬࢎೞա, ViewModel਷ Viewܳ ઁযೞ૑ ঋ਺
    ▸ Viewח ViewModelਸ ഐ୹ೞغ, Ѿҗח Callback / Observable ഋక۽ ߉਺
    

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28. http://kyubid.com/blog/understanding-mvvm-on-android-tutorial-05-introduction-to-reactive-programming-with-rxjava/
    

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29. PHASE II. ਭই੿ࠁ APP
    SOLUTION
    ▸ Reactive Extension (RxSwift / RxJava)੄ بੑ
    ▸ eg. API request -> response -> оҕ -> Local DB јन ഑਷ ాन पಁ द Local DB select -> UI јन ١١ ࠺زӝ੸
    ਵ۽ ੉য૑ח ੌ۲੄ ױ҅ܳ ࢶഋ੸ਵ۽ ҳഅೡ ࣻ ੓ח ъ۱ೠ ࣻױਸ ઁҕ
    ▸ п ױ҅ ੘স੄ झா઴۞(~= झۨ٘) ૑੿੉ ਊ੉
    ▸ Ayncೠ ୊ܻܳ ൒ܴী ٮۄ sequentialೞѱ ҳഅೡ ࣻ ੓ӝ ٸޙী,
    ▸ ௏٘ оةࢿ+ࢤ࢑ࢿ әѺ൤ ೱ࢚ (ױ Rx੄ ૑ध੉ হח ࢎۈীѱח য়൤۰ դ೧..)
    ▸ UI / Domain(Business) / Data ۽૒੄ ܻ࠙о ਊ੉೧૗
    ▸ ী۞ ୊ܻо ए਑
    ▸ ஂࣗ ୊ܻо ए਑ - App LifeCycleҗ औѱ োز оמ -> eg. ੹ചо য়Ѣա জਸ ࠺ഝࢿച दఆ ҃਋
    

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30. PHASE II. ਭই੿ࠁ APP
    SOLUTION
    ▸ Unit Test ੹ݶ بੑ
    ▸ CI৬ ো҅, QA হ੉ب ծ਷ ੢গਯ ࠁ੢
    

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31. PHASE II. ਭই੿ࠁ APP
    SOLUTION
    ▸ Dependency Injection - SWInject / Dagger
    ▸ Swift੄ ҃਋ annotation / DSL ઁডਵ۽ ޷۰ೠ DI ҳഅ਷ য۰਑
    ▸ Android੄ ҃਋, ъ۱ೠ DI ҳഅ୓ ઓ੤
    ▸ Dagger(Annotation ӝ߈), Koin(Kotlin DSL ӝ߈)
    ▸ Dagger੄ ੢੼: annotation
    ▸ Dagger੄ ױ੼: annotation
    ▸ ੄৻੄ ੢੼(?)ب..
    

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33. PHASE II. ਭই੿ࠁ APP
    Ѿҗ
    ▸ 1/15 ଱ࣻ, 3/2 2.0 ୹द
    ▸ ղ஘ ӣী ؀۝੄ नӝמ ୶о: 4/24 2.5 ୹द
    ▸ ӝઓ Baby Sitter জب ߡ੹ স
    

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34. PHASE III. HR APP
    ౠ૚
    ▸ ࠁਭࢎ ҙ۲ ҳੋ ࢲ࠺झ ઺ द੢੼ਬਯ 1ਤ ࢲ࠺झ
    ▸ ഥࢎ੄ ݒ୹੄ 90%о ૘઺ػ ࢲ࠺झ
    

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35. PHASE III. HR APP
    CHALLENGE
    ▸ জ ৻੸ੋ ਃੋٜ..
    ▸ ݽ߄ੌ ౱ әࢿ੢ - ౱੉ ц੗ӝ 8ݺ ӏݽ۽ әૐ. ݽ߄ੌ ؀਽ back-endө૑ ѐߊ. Үਭ ࠺
    ਊ әૐ.
    ▸ ഥࢎ੄ ӝр ࢲ࠺झۄ ࣾоۅ ԡҊ रযೞח ࢎۈٜ੉ ݆਺..
    

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36. PHASE III. HR APP
    SOLUTION
    ▸ Clean Architecture ੹ݶ ੸ਊ
    ▸ DDD (ੌࠗ) بੑ
    ▸ Rx੄ Subject بੑ
    

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37. https://qiita.com/koutalou/items/07a4f9cf51a2d13e4cdc
    

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38. PHASE III. HR APP
    Ѿҗ
    ▸ 6/8 ࢜ߡ੹ ܾܻૉ
    ▸ ഥࢎ੄ 3؀ ࢲ࠺झ੄ ܻ׏঴੉ ݽف ݃ޖܻ ؽ
    ▸ ౱ ࣇস ৮ܐ: ੉ઁח ҕ੢ ୓੤..
    

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39. PHASE IV. PRESENT & WHAT’S NEXT
    NEW CHALLENGE
    ▸ HR জ੄ ੹ݶ ѐಞ
    ▸ ޛۿ ӝઓ জٜ੄ ਬ૑ࠁࣻח ҅ࣘ ೞݶࢲ..
    

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40. PHASE IV. PRESENT & WHAT’S NEXT
    SOLUTION
    ▸ TDD۽ ૓೯! (Ӓېب ழߡܻ૑ח Ӓۧѱ ֫૑ח ঋणפ׮)
    ▸ View - ViewModel р੄ ాन
    ▸ ੉߮౟ ా૑ ࠗ࠙
    ▸ iOS੄ ҃਋,
    ▸ Rx੄ subject ٜਸ ੉ਊ: PublishSubject, BehaviorRelay, etc.
    ▸ Driver / Signal۽ ੉߮౟ ࣻन - ੉߮౟ܳ ৈ۞ Ҕীࢲ ߉ਸ ࣻ ੓਺. ݫੋझۨ٘ ز੘ਸ ࠁ੢.
    ▸ Android੄ ҃਋, LiveData ࢎਊ
    

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41. PHASE IV. PRESENT & WHAT’S NEXT
    SOLUTION
    ▸ View - ViewModel р੄ ాन (Cont’d)
    ▸ UI ߸҃ ࠗ࠙
    ▸ ViewModel੄ о੢ ௾ ޙઁо ੉ ࠗ࠙
    ▸ Android੄ ҃਋, DataBinding: XML੄ UI ੿੄ী ੉߮౟ө૑ োѾ оמ
    ▸ iOS੄ ҃਋, RxBindingਸ ాೠ ਋ഥ ҳഅ
    

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42. PHASE IV. PRESENT & WHAT’S NEXT
    SOLUTION
    ▸ iOS / Android ੄ ܻ࠙
    ▸ ݽ߄ੌ ѐߊীࢲ ాੌ੢ ੉ۿ(Unified Field)ח оמೠо? sweet temptation but..
    ▸ ޛۿ domain logic/model੄ ࢚ഐ਍ਊ਷ ݒ਋ ਬਊ
    

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43. THANK YOU
    VERY MUCH!
    Sa-ryong Kang

    justfaceit@gmail.com
    

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