kotlin-mpp-library-tips

Cookpad.apk #2 登壇資料 https://cookpad.connpass.com/event/117054/

Transcript

1. ,PUMJO.VMUJ1MBUGPSN-JCSBSZ
   !V[[V
   

   View Slide

2. "HFOEB
   wܦҢ
   w,PUMJO.11 .VMUJ1MBUGPSN1SPKFDU
   ͷ֓ཁ
   wݱঢ়
   w5*14ू
   w ࠓ͸େৎ෉͚ͩͲ
   কདྷతʹେมͦ͏ͩͳͱࢥ͏ࣄ
   

   View Slide

3. ܦҢ
   
   w৽نΞϓϦ޲͚ͷೝূΞϓϦ಺՝ۚ౷ׅϥΠϒϥϦ
   Λ࡞͍ͬͯΔ J04޲͚
   ͜ͷล͸5FDI$POGΛָ͓͠Έʹ
   w"OESPJEͰ͸ೝূ"1*ΫϥΠΞϯτΞϓϦ಺՝ۚ
   ϥΠϒϥϦΛͦΕͧΕݸผʹ࡞ΓɺͦΕΛར༻ऀଆ
   Ͱܨ͗͜ΜͰ͍ͨ
   

   View Slide

4. ܦҢ
   
   w"OESPJE༻ͷೝূΞϓϦ಺՝ۚ౷ׅϥΠϒϥϦͷधཁ
   ͕ߴ·ͬͨ
   wͨͩ"OESPJE༻ʹϥΠϒϥϦ࡞Δࣄ΋Ͱ͖Δ͕

   ΍Ε͹Ͱ͖ͯ͠·͏ͷͰ௅ઓ͕ͳ͍
   w ݱ࣌఺Ͱࣾ಺धཁ͸ແ͍͕
   ,PUMJO.11ͷࢼݧӡ༻΋
   ݉Ͷͯ΍ͬͯΈΔࣄʹ
   

   View Slide

5. ؆୯ͳ֓ཁ
   wl&YQFSJNFOUBMGFBUVSFJO,PUMJOBOEz
   w1MBUGPSNؒͰίʔυΛڞ༗͢Δ +7. "OESPJE
   +BWB4DSJQU J04 -JOVY 8JOEPXT .BD FUDʜ
   
   wϓϥοτϑΥʔϜඇґଘͳίʔυ͸DPNNPOQSPKFDU

   ґଘίʔυ͸QMBUGPSNQSPKFDUʹॻ͍͍ͯ͘
   

   View Slide

6. Kotlin
   Source Codes
   Kotlin / JVM Kotlin / Native Kotlin / JS
   JVM Android Executable
   Dynamic
   Library
   iOS Node.js
   Browser JS
   Server app
   Desktop app
   etc…
   Android app iOS(arm32, arm64, emulator x86_64)
   MacOS(x86_64)
   Android(arm32, arm64)
   Linux(x86_64, arm32, MIPS, MIPS little endian)
   WebAssembly(wasm32)
   Windows(mingw x86_64)
   Frontend Web app
   Server app
   etc…
   

   View Slide

7. Kotlin
   Source Codes
   Kotlin / JVM Kotlin / Native Kotlin / JS
   JVM Android Executable
   Dynamic
   Library
   iOS Node.js
   Browser JS
   java.util.concurrent.*
   Handler
   pthread
   etc…
   Promise
   Coroutines - ඇಉظॲཧ
   -> abstraction by CoroutineContext
   GCD
   

   View Slide

8. Kotlin
   Source Codes
   Kotlin / JVM Kotlin / Native Kotlin / JS
   JVM Android Executable
   Dynamic
   Library
   iOS Node.js
   Browser JS
   nghttp2
   libcurl
   etc…
   Fetch API
   ktor-client - HTTPClient
   -> abstraction by HTTPClientEngine
   NSURLRequest
   etc…
   apache
   Jetty
   etc…
   okhttp
   etc…
   request
   node-fetch
   etc..
   

   View Slide

9. View Slide

10. .VMUJ,PUMJO.VMUJ1MBUGPSN1SPKFDU
    ݴ͍͍͚ͨͩ
    
    

    View Slide

11. 5FDIOPMPHZ4UBDL
    w(SBEMF ,PUMJOʙ ݱࡏ͸
    
    wLPUMJOTUEMJC LPUMJOYDPSPVUJOFTDPSF
    LPUMJOYTFSJBMJ[BUJPO LUPSDMJFOU
    wLPUMJOUFTU LPUMJOYDPSPVUJOFTUFTU LUPSDMJFOU
    NPDL NPDLL BTTFSUL LUMJOU
    wޙ͸QMBUGPSNʹ߹Θͤͯ0L)UUQ౳
    

    View Slide

12. ͔͜͜Β5*14ू
    

    View Slide

13. (SBEMF1SPKFDU4USVDUVSF
    wͦ΋ͦ΋Ͳ͏͠Α͏໰୊
    w·Ͱ͸,PUMJO%4-ະαϙʔτͩͬͨ
    w͔ΒͷQSPKFDUTUSVDUVSFͰ΍͍ͬͯͬͨͱ
    ͖ͷকདྷతͳϏϧυεΫϦϓτͷϝϯς͕ਏͦ͏ʜ
    

    View Slide

14. (SBEMF1SPKFDU4USVDUVSF
    ➔ܥͷࠒͷQSPKFDUTUSVDUVSFΛ౿ऻ
    

    View Slide

15. (SBEMF1SPKFDU4USVDUVSF
    https://github.com/uzzu/kotlin-mpp-boilerplate
    

    View Slide

16. (SBEMF1SPKFDU4USVDUVSF
    ➔ܥͷࠒͷQSPKFDUTUSVDUVSFΛ౿ऻ
    ɹBOESPJEϏϧυݻ༗ͷόάʹҾ͔͔ͬΔࣄ΋ͳ͍
    ɹͷͰศར͚ͩͬͨͲɺطʹमਖ਼͞Ε͍ͯΔ͠
    ɹEFQSFDBUFEʹͳͬͨΒ΍ΊΑ͏͔ͳͱ͍͏ؾ࣋ͪ
    

    View Slide

17. *%&4FUUJOHT
    *%&্ͰͷVOJUUFTU࣮ߦʹࠔͬͨΒ
    
    

    View Slide

18. LUPSDMJFOU
    wLPUMJOSFqFDUґଘ

    όΠφϦαΠζ͕େ͖͘ͳͬͯ͠·͏ʜ
    ɹ➔ݱঢ়ख෇͔ͣɻ࣏͍ͨ͠ʜ
    

    View Slide

19. LUPSDMJFOUPLIUUQ
    wϥΠϒϥϦ͸,PUMJO.11Ͱ࡞ͬͯΔ͚Ͳ

    ΞϓϦ͸,PUMJO.11Ͱ͸࡞͍ͬͯͳ͍

    ී௨ͷ"OESPJEΞϓϦ
    
    w"OESPJEͷੈքͰ͸
    3FUSPpU "QPMMP 3FBDU/BUJWF FUDʜͱ΋

    ܨ͍͗ͨधཁ͕͋Δ
    w0L)UUQ$MJFOUͷΠϯελϯεΛڞ༗͍ͨ͠
    

    View Slide

20. LUPSDMJFOUPLIUUQ
    wLUPSDMJFOUPLIUUQͰ͸ෆՄ
    ɹ➔0L)UUQ$MJFOU&OHJOFΛࣗ࡞ͯ͠

    ɹɹLUPSDMJFOUքͱ"OESPJEքͰ

    ɹɹ0L)UUQ$MJFOUΛڞ༗
    

    View Slide

21. LPUMJOYTFSJBMJ[BUJPO
    w(SBEMF1MVHJOͰͷ4FSJBMJ[FS%FTFSJBMJ[FSੜ੒ػೳ

    Λ࢖Θͳ͍ͱ͍͚ͳ͍ఔن໛͕େ͖͘ͳ͍

    BOOPUBUJPOQSPDFTTJOH͠ͳͯ͘ࡁΉͳΒͨ͘͠ͳ͍
    ɹ➔+TPO0CKFDUMJLFͳػೳ΋͋ΔͷͰͦΕΛ࢖͏

    ɹɹ(SBEMF1MVHJO͸BQQMZෆཁʹ͍ͯ͠Δ

    ɹɹৄࡉ͸https://uzzu.github.io/post/kotlin-json-serialization-mini.html
    

    View Slide

22. $PSPVUJOFT
    wͳΜ͔ͩΜͩͰ.VUFYΛΑ͘࢖͏

    ೝূपΓ͸ฒྻʹ૸ΒΕͯ΋ࠔΔ

    ͔ͭQPTUQPOFʹ΋ͨ͘͠ͳ͍

    ݺͼग़͠͸ճͰɺฒྻʹݺ͹Εͨશͯͷ࣮ߦίϯς
    Ωετʹฦ٫͍ͨ͠

    ͭ·ΓQVCMJTISFGDPVOU WJB3Y
    ͍ͨ͠
    

    View Slide

23. $PSPVUJOFT
    https://github.com/uzzu/kortex
    

    View Slide

24. $PSPVUJOFT
    class CallCount(val value: Int) {
    override fun equals(other: Any?) = this === other
    }
    var callCount = 0
    suspend fun increment(): CallCount {
    ++callCount
    delay(10)
    return CallCount(callCount)
    }
    ྫ
    ϝιουίʔϧ͞Εͨճ਺Λฦ٫͢Δ͚ͩͷؔ਺
    

    View Slide

25. $PSPVUJOFT
    @Test
    fun basicWithHot() = runBlocking(hotInvocation()) {
    val times = 3
    val results = mutableListOf()
    val jobs = mutableListOf()
    repeat(times) { i ->
    val job = launch {
    runCatching { withContext(Dispatchers.IO) { withHot("hot") { increment() } } }
    .onSuccess { results.add(it) }
    .onFailure { fail("[$i] Exception occurred: $it") }
    }
    jobs.add(job)
    }
    jobs.forEach { it.join() }
    assertAll {
    assertThat(results.size).isEqualTo(times) // શͯͷ࣮ߦContextʹincrement()ͷ݁Ռ͕ฦ٫͞ΕΔ
    assertThat(results.distinct().size).isEqualTo(1) // ಉҰΦϒδΣΫτ͕ฦ٫͞ΕΔ
    assertThat(results.distinct()[0].value).isEqualTo(1) // increment()ͷݺग़ճ਺͸1ճ
    }
    }
    

    View Slide

26. $PSPVUJOFT
    wৄࡉ͸

    https://uzzu.github.io/post/hot-coroutines.html
    

    View Slide

27. 5FTUJOH
    wجຊతʹDPNNPOʹॻ͘
    wDPNNPOʹॻ͍͓ͯ͘ͱɺ֤1MBUGPSNͷVOJU
    UFTU࣮ߦ࣌ʹ·ͱΊͯVOJUUFTU͕࣮ߦ͞ΕΔ
    

    View Slide

28. 5FTUJOH$PSPVUJOFT
    wSVO#MPDLJOH͸KWNͷΈఏڙ͞Ε͍ͯΔ

    DPNNPOʹςετॻ͖͍ͨ
    wݱঢ়͸UFTUJOGSBͳTVCQSPKFDUΛ࡞ͬͯSVO#MPDLJOHΛ

    FYQFDUBDUVBMͷܗʹ͍ͯ͠Δ KTͳΒQSPNJTFNPDIBͰ
    

    ۩ମతͳίʔυ͸https://gist.github.com/uzzu/58cb8bb12c17605017edd01b8498915a
    
    w,PUMJOͳ͍͠$PSPVUJOFT-JCSBSZ্Ͱ

    ରԠ͕ೖΔ༧ఆʜͱࢥ͍ͬͯΔ͚ͲJTTVFḷ͍ͬͯ͘ͱ

    ΋ͬͱ͔͔Γͦ͏ͳؾ͕͢Δʜhttps://youtrack.jetbrains.com/issue/KT-19813
    

    View Slide

29. ͜͜·Ͱ5*14
    

    View Slide

30. কདྷతʹେมͦ͏ͩͱࢥ͏ࣄ
    w,PUMJO/BUJWFͷςετ

    .PDLL΋"TTFSUL΋ݱঢ়/BUJWFඇରԠͳͷͰ

    ଴ͪঢ়ଶ
    

    View Slide

31. কདྷతʹେมͦ͏ͩͱࢥ͏ࣄ
    w,PUMJO/BUJWFͷ$*؀ڥ

    J04޲͚ͷςετ͸࣮ߦՄೳܗࣜͰు͍ͯɺYDSVOͯ͠Ϩ
    ϙʔτूܭ͍ͯ͠ΔJ04Ϗϧυ؀ڥ͕͍Δ

    ଞͷBSDIJUFDUVSF΋ಉ༷

    $*؀ڥͱςετϨϙʔτूܭͲ͏͢Δ QMBUGPSNຖʹ
    QJQFMJOFԽͯ͠΍ΔΜͩͱࢥ͏
    

    ΋ͪΖΜ/BUJWF͸J04͚ͩͰ͸ͳ͍ͷͰҎԼུ

    

    View Slide

32. কདྷతʹେมͦ͏ͩͱࢥ͏ࣄ
    wͨ͘͞Μ͋ΔͷͰ͓࿩͠·͠ΐ͏ʂ
    

    View Slide