kotlin-mpp-library-tips

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,PUMJO.VMUJ1MBUGPSN-JCSBSZ !V[[V

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

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

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ܦҢ w"OESPJE༻ͷೝূΞϓϦ಺՝ۚ౷ׅϥΠϒϥϦͷधཁ ͕ߴ·ͬͨ wͨͩ"OESPJE༻ʹϥΠϒϥϦ࡞Δࣄ΋Ͱ͖Δ͕  ΍Ε͹Ͱ͖ͯ͠·͏ͷͰ௅ઓ͕ͳ͍ w ݱ࣌఺Ͱࣾ಺धཁ͸ແ͍͕ ,PUMJO.11ͷࢼݧӡ༻΋ ݉Ͷͯ΍ͬͯΈΔࣄʹ

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

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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…

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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

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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..

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.VMUJ,PUMJO.VMUJ1MBUGPSN1SPKFDU ݴ͍͍͚ͨͩ

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

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͔͜͜Β5*14ू

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

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(SBEMF1SPKFDU4USVDUVSF ➔ܥͷࠒͷQSPKFDUTUSVDUVSFΛ౿ऻ

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

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

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*%&4FUUJOHT *%&্ͰͷVOJUUFTU࣮ߦʹࠔͬͨΒ

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LUPSDMJFOU wLPUMJOSFqFDUґଘ  όΠφϦαΠζ͕େ͖͘ͳͬͯ͠·͏ʜ ɹ➔ݱঢ়ख෇͔ͣɻ࣏͍ͨ͠ʜ

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LUPSDMJFOUPLIUUQ wϥΠϒϥϦ͸,PUMJO.11Ͱ࡞ͬͯΔ͚Ͳ  ΞϓϦ͸,PUMJO.11Ͱ͸࡞͍ͬͯͳ͍  ී௨ͷ"OESPJEΞϓϦ w"OESPJEͷੈքͰ͸ 3FUSPpU "QPMMP 3FBDU/BUJWF FUDʜͱ΋  ܨ͍͗ͨधཁ͕͋Δ w0L)UUQ$MJFOUͷΠϯελϯεΛڞ༗͍ͨ͠

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LUPSDMJFOUPLIUUQ wLUPSDMJFOUPLIUUQͰ͸ෆՄ ɹ➔0L)UUQ$MJFOU&OHJOFΛࣗ࡞ͯ͠  ɹɹLUPSDMJFOUքͱ"OESPJEքͰ  ɹɹ0L)UUQ$MJFOUΛڞ༗

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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

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$PSPVUJOFT wͳΜ͔ͩΜͩͰ.VUFYΛΑ͘࢖͏  ೝূपΓ͸ฒྻʹ૸ΒΕͯ΋ࠔΔ  ͔ͭQPTUQPOFʹ΋ͨ͘͠ͳ͍  ݺͼग़͠͸ճͰɺฒྻʹݺ͹Εͨશͯͷ࣮ߦίϯς Ωετʹฦ٫͍ͨ͠  ͭ·ΓQVCMJTISFGDPVOU WJB3Y ͍ͨ͠

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

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$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਺

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$PSPVUJOFT @Test fun basicWithHot() = runBlocking(hotInvocation()) { val times = 3 val results = mutableListOf() val jobs = mutableListOf() repeat(times) { i -> val job = launch { runCatching { withContext(Dispatchers.IO) { withHot("hot") { increment() } } } .onSuccess { results.add(it) } .onFailure { fail("[$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 } }

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$PSPVUJOFT wৄࡉ͸  https://uzzu.github.io/post/hot-coroutines.html

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5FTUJOH wجຊతʹDPNNPOʹॻ͘ wDPNNPOʹॻ͍͓ͯ͘ͱɺ֤1MBUGPSNͷVOJU UFTU࣮ߦ࣌ʹ·ͱΊͯVOJUUFTU͕࣮ߦ͞ΕΔ

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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

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͜͜·Ͱ5*14

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কདྷతʹେมͦ͏ͩͱࢥ͏ࣄ w,PUMJO/BUJWFͷςετ  .PDLL΋"TTFSUL΋ݱঢ়/BUJWFඇରԠͳͷͰ  ଴ͪঢ়ଶ

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কདྷతʹେมͦ͏ͩͱࢥ͏ࣄ w,PUMJO/BUJWFͷ$*؀ڥ  J04޲͚ͷςετ͸࣮ߦՄೳܗࣜͰు͍ͯɺYDSVOͯ͠Ϩ ϙʔτूܭ͍ͯ͠ΔJ04Ϗϧυ؀ڥ͕͍Δ  ଞͷBSDIJUFDUVSF΋ಉ༷  $*؀ڥͱςετϨϙʔτूܭͲ͏͢Δ QMBUGPSNຖʹ QJQFMJOFԽͯ͠΍ΔΜͩͱࢥ͏   ΋ͪΖΜ/BUJWF͸J04͚ͩͰ͸ͳ͍ͷͰҎԼུ 

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কདྷతʹେมͦ͏ͩͱࢥ͏ࣄ wͨ͘͞Μ͋ΔͷͰ͓࿩͠·͠ΐ͏ʂ