LINEでKotlinを活用してサービスを作っていく話 / The story about using Kotlin to create a new service at LINE

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-*/&で,PUMJOを活用してサービスを作っていく話 -*/&株式会社 ؠ୩໌

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ؠ୩ ໌ -*/&גࣜձࣾ ։ൃ,νʔϜ ೥ೖࣾ -*/& -*7&ͷ"OESPJEΞϓϦ΍-*/& ϊϕϧͷJ04ΞϓϦͳͲͷΫϥΠΞϯ τΤϯδχΞΛܦͯɺ ೥͔Β ϥΠϒίϚʔεʮ-*7:ʯͷαʔ όʔαΠυΛ΍͍ͬͯ·͢ *XBZB "LJSB

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• -*/&Ͱࠓճ৽͘͠։ൃͨ͠ϥΠϒίϚʔεαʔϏεͷ͝঺հ • ։ൃʹ͋ͨͬͯͷཁ݅ͱٕज़બఆ • ,PUMJO$PSPVUJOFͷઆ໌ • ,PUMJO$PSPVUJOF 4QSJOH H31$ 3%#$ 3FEJTʣ࣮ફ ࠓ೔͓࿩͢͠Δ಺༰

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-*/&ͷϥΠϒίϚʔεαʔϏε ʹςετϩʔϯν ৽αʔϏε -*7: ެ։ʂ • -*/&্Ͱࢹௌɾߪೖ·Ͱ׬݁ • ϥΠϒ഑৴Λݟͳ͕ΒλοϓͰ঎඼͕ങ͑Δ • ϦΞϧλΠϜͳΠϯλϥΫγϣϯ

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ϥΠϒίϚʔεαʔϏεʁ • ϥΠϒ഑৴Λ͠ͳ͕Β঎඼Λ঺հɾߪೖͰ͖ΔαʔϏε ηϥʔ Ϣʔβʔ ϦΞϧλΠϜͰ ߪങঢ়گ͕Θ͔Δ ࢹௌ͠ͳ͕Β ͦͷ৔Ͱങ͑Δ -*7&Ͱ঎඼঺հ νϟοτͷ࣭໰ճ౴΍ ίϛϡχέʔγϣϯ ؾʹͳΔϙΠϯτΛ ௚઀࣭໰Ͱ͖Δ ಈతͳ ങ͍෺ͷָ͠͞ εϚϗͰ खܰʹ഑৴ -*7&ࢹௌ ߪೖ

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ߪೖϑΟʔυόοΫ νϟοτ ஫จ ৄࡉը໘ -*/&্Ͱ࢖͑ΔϥΠϒίϚʔεαʔϏε -*/&'SPOUFOE'SBNFXPSL-*''ͷ׆༻ • -*''8FCΞϓϦέʔγϣϯΛ-*/&্Ͱಈ͔ͤΔϑϨʔϜϫʔΫ • ͲͳͨͰ΋࡞Ε·͢ IUUQTMJGGTUBSUFSOFUMJGZBQQ

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ηϥʔ޲͚$.4 • ഑৴؅ཧ • ঎඼؅ཧ • ஫จ؅ཧ • ൃૹॲཧ

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ηϥʔ޲͚ΞϓϦ 'MVUUFS ഑৴ ొ࿥ɾฤू ϓϨϏϡʔ

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• ϥΠϒ • ίϚʔε -*7:αʔϏεͷཁ݅

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• ಉ࣌ؒ͡ʹେྔͷϢʔβʔ͕ΞΫηε͢Δ • ഑৴ͷ؅ཧ • ϦΞϧλΠϜੑʢ഑৴தʹى͜ΔΠϕϯτͷ఻ୡʣ • ΠϯλϥΫςΟϒੑʢνϟοτ΍ߪೖʹΑΔϢʔβʔ͔ΒͷΞΫγϣϯʣ ϥΠϒͷཁ݅

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• ঎඼ͷ؅ཧ • ஫จͷ؅ཧ • ܾࡁ • ൃૹ ίϚʔεͷཁ݅

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• 8FCαΠτ -*'' • ηϥʔ޲͚$.4 • ηϥʔ޲͚ΞϓϦ • ࣾ಺$.4 • -*/&Ͱͷ௨஌ϝοηʔδͷૹ৴ͳͲ Ϣʔβʔ޲͚ʹ࡞Δ΋ͷ

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اըͱ૬ஊ جຊతͳཁ݅ͷܾఆ ϥΠϒ ͷཁ݅ ίϚʔε ͷཁ݅ ࡞Δ΋ͷ ͨͪ 3FRVJSF NFOU 3FRVJSF NFOU 3FRVJSF NFOU

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• εέʔϥϏϦςΟ • ύϑΥʔϚϯε • ϩδοΫ͕େ͖͘ҟͳΔίϯϙʔωϯτΛಉ࣌ʹ࡞Δඞཁ • ෳ਺ίϯϙʔωϯτؒͰ௨৴ • ڞ௨͢ΔػೳΛ࣋ͭ8FCͱ"QQ͕ඞཁ 3FRVJSFNFOUT

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• গ਺ਫ਼Ӷ • νʔϜ͸ΞϓϦͱαʔόʔ • ҰํͰઐ໳νʔϜ͕ଘࡏ • ϑϩϯτΤϯυ • -*/&1BZܾࡁ • 35.1ɾ)-4഑৴ • ਫ਼ࢉ FUD ͱ͜ΖͰ-*/&ͷ։ൃελΠϧͱࠓճͷϓϩδΣΫτͷ؀ڥ • ͪΐ͏Ͳ͍͍λΠϛϯά • աڈͷܦݧ͔Βͷվળ • ৽͍ٕ͠ज़ͷΩϟονΞοϓ • ࣮ݧతʹࢼͤΔ؀ڥ

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• ϚΠΫϩαʔϏε ϩδοΫͷ͍ͩͿҟͳΔཁ݅ʢϥΠϒͱίϚʔεͳͲʣ͕͋ΔͷͰ෼཭͠΍͍͢ 8FCαΠτ΍$.4ͳͲͷෳ਺ͷίϯϙʔωϯτ͕͋Δ গਓ਺Ͱ։ൃ͢Δ͕ϝϦοτ͕͋Δͱ൑அ • ,VCFSOFUFT ϚΠΫϩαʔϏεͷͨΊ εέʔϥϏϦςΟΛ୲อ ࣾ಺ʹ͸.BOBHFEͳ,VCFSOFUFTΫϥελΛӡ༻͢ΔνʔϜ͕͋Δ બఆٕͨ͠ज़

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• ,PUMJO ࣾ಺Ͱ͸+BWB͕ओྲྀͰ࠷ۙͰ͸,PUMJO΋ଟ͍ ޙड़͢Δ$PSPVUJOFʹΑΔඇಉظॲཧͱͷ਌࿨ੑ • H31$ ෳ਺ίϯϙʔωϯτؒͷ௨৴ ෳ਺ͷ։ൃνʔϜΛ·͍ͨͩεΩʔϚ؅ཧͷͨΊ 4FSWFSTUSFBNJOH31$Λ࢖ͬͯΫϥΠΞϯτͷը໘Λߋ৽ • .Z42- 3FEJT ,BGLB ͜ͷล͸͍ͭ΋௨Γ બఆٕͨ͠ज़

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ΞʔΩςΫνϟ

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• ύϑΥʔϚϯεΛग़ͨ͢ΊʹͰ͖Δ͚ͩඇಉظʹ͍ͨ͠ • ϚΠΫϩαʔϏεͰ͸ͨ͘͞Μͷ31$Λߦ͏ • ࣗαʔϏε಺ͷ௨৴΋ɺ-*/&಺ͷଞαʔϏεͱͷ௨৴΋ଟ͍ • ಉظతʹ࣮૷ͯ͠͠·͏ͱɺ௨৴ʹ͔͔ΔϨΠςϯγͷؒ*0଴ͪͰແବ͕ଟ͍ • Ͱ͖Δ͚ͩʜϦΫΤετ͔ΒϨεϙϯε·Ͱ • ࠓ·Ͱඇಉظॲཧͱ͍͑͹ • 'VUVSF 1SPNJTF 3Y+BWB 3FBDUPS 4QSJOH8FC'MVY • $BMMCBDL)FMM΍)PU$PMEͷѻ͍ͳͲετϦʔϜͷ೉͠͞ ϚΠΫϩαʔϏεʹ͓͚ΔύϑΥʔϚϯε

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• $PSPVUJOFʜதஅՄೳ TVTQFOEBCMF ͳॲཧ • 5ISFBEʹࣅ͍ͯΔ͕ΑΓܰྔͰεΠονͷίετ΋ͳ͍ • ಛఆͷ5ISFBEʹ݁ͼ͔ͭͳ͍ org.jetbrains.kotlinx:kotlinx-coroutines-core ͦ͜Ͱ,PUMJO$PSPVUJOF LPUMJOYDPSPVUJOF ˞ग़యɿIUUQTLPUMJOMBOHPSHEPDTDPSPVUJOFTCBTJDTIUNM

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ྫ ˞ग़యɿIUUQTLPUMJOMBOHPSHEPDTDPSPVUJOFTCBTJDTIUNM • MBVODIDPSPVUJOFCVJMEFSಠ ཱͯ͠ฒߦʹಈ͘$PSPVUJOFΛ ࡞Δ • EFMBZTVTQFOEJOHGVODUJPO ࢦఆ͞Εͨ࣌ؒTVTQFOE͢Δɻ $PSPVUJOFΛTVTQFOEͯ͠΋ͦ ͷεϨου͸ϒϩοΫ͠ͳ͍ɻ ଞͷDPSPVUJOF΍ίʔυ͸ಈ͘ • SVO#MPDLJOHDPSPVUJOFCVJME FSී௨ͷಉظతͳίʔυ͔Β DPSPVUJOFΛىಈ͢Δɻ׬ྃ͢ Δ·Ͱىಈ͞ΕͨεϨουΛϒ ϩοΫ͢Δ

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4VTQFOEJOHGVODUJPO ˞ग़యɿIUUQTLPUMJOMBOHPSHEPDTDPSPVUJOFTCBTJDTIUNM • TVTQFOE म০ࢠΛGVODUJPOʹ͚ͭΔͱ TVTQFOEJOHGVODUJPOʹͳΔ • 4VTQFOEJOHGVODUJPO͸ଞͷTVTQFOEJOHGVODUJ POΛݺͼग़ͤΔ • 4VTQFOEJOHGVODUJPO͸$PSPVUJOF4DPQF͔ଞͷ TVTQFOEJOHGVODUJPO͔Β͔͠ݺͼग़ͤͳ͍ • ͜ΕΛ܁Γฦͯ͠΄ͱΜͲTVTQFOEJOHGVODUJPO Λॻ͘͜ͱʹͳΔ

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4USVDUVSFE$PODVSSFODZ ˞ग़యɿIUUQTLPUMJOMBOHPSHEPDTDPSPVUJOFTCBTJDTIUNM • $PSPVUJOF͸DPSPVUJOFʢݫີʹ͸DPSPVUJOF4DPQFʣͷத͔Β ͔͠ىಈͰ͖ͳ͍ • ͖ͬ͞ͷྫͰ͸SVO#MPDLJOH͕DPSPVUJOF4DPQF • ֎ଆͷDPSPVUJOF͸಺ଆͷDPSPVUJOF͕શ෦׬ྃ͠ͳ͍ͱ׬ྃ͠ ͳ͍ • DPSPVUJOF4DPQF \ʜ^Λ࢖͏ͱࣗ෼ͰDPSPVUJOF4DPQF͕࡞Ε Δ • SVO#MPDLJOHͱҧͬͯεϨουΛϒϩοΫ͠ͳ͍ͷͰTVTQFOEJ OHGVODUJPOʹͳ͍ͬͯΔ • ࠨͷྫͰ͸DPSPVUJOF4DPQF಺ͷͭͷMBVODI\ʜ ^͸ฒྻʹಈ ࡞͢Δ • EP8PSME͸྆ํ͕׬ྃ͠ͳ͍ͱ׬ྃ͠ͳ͍

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• 4QSJOH'SBNFXPSLͰ$PSPVUJOFͷαϙʔτ͕ೖΔ˞ • %FGGFSFEͱ'MPXʢ͍ͣΕ΋$PSPVUJOFͷ࣮ߦ݁ՌΛද͢ΫϥεʣΛ!$POUSPMMFSͷ4QSJOH8FC'MVYͷ໭Γ஋ʹ࢖͑ ΔΑ͏ʹͳͬͨΓɺ4VTQFOEJOHGVODUJPOͱͯ͠ॻ͚ΔΑ͏ʹͳͬͨΓ • GVOIBOEMFS.POP5ˠ TVTQFOEGVO5 • 4QSJOHͰ͸3FBDUPSΛར༻ͯ͠ඇಉظɾϦΞΫςΟϒϓϩάϥϛϯάΛ࣮ݱ͍ͯ͠Δ • 3FBDUPS ⁶ DPSPVUJOFͷม׵ΛΑ͘΍Δ͜ͱʹͳΔ ,PUMJO$PSPVUJOFͱ4QSJOH ˞ग़యɿIUUQTEPDTTQSJOHJPTQSJOHGSBNFXPSLEPDT.TQSJOHGSBNFXPSLSFGFSFODFMBOHVBHFTIUNMDPSPVUJOFT org.jetbrains.kotlinx:kotlinx-coroutines-reactive org.jetbrains.kotlinx:kotlinx-coroutines-reactor

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• HSQDKBWB JPHJUIVCMPHOFUHSQDTQSJOHCPPUTUBSUFS˞ • HSQDLPUMJOʹҠߦ͢Δܭըத • ੜ੒͞ΕͨGVODUJPOͰDPSPVUJOFΛ࢖͑ΔΑ͏ ʹ$PSPVUJOF-BVODIFSͱ͍͏ΫϥεΛ࡞੒ • ʢ༨ஊʣ31$ͷ໋໊͸VCFSͷ1SPUPCVG 4UZMF (VJEF7 ˞˞ʹ͕͍ͨͬͯ͠Δ ,PUMJO$PSPVUJOFͱH31$ ˞ग़య IUUQTHJUIVCDPN-PH/FUHSQDTQSJOHCPPUTUBSUFS ˞˞ग़య IUUQTHJUIVCDPNVCFSQSPUPUPPMCMPCEFWTUZMF3&"%.&NE

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$PSPVUJOFͰH31$ͷϨεϙϯεΛฦ͢ • $PSPVUJOF&YDFQUJPO)BOEMFSͰΤ ϥʔϋϯυϥΛ$PSPVUJOF4DPQFʹ ઃఆ • ྫ֎ൃੜ࣌͸SFTQPOTF0CTFSWFS PO&SSPSͰΤϥʔฦ͢ • MBVODI಺ͰҾ਺ͷTVTQFOEJOHMBN CEBΛ࣮ߦͯ͠SFTQPOTF0CTFSWFS PO/FYUͰϨεϙϯεΛฦ͍ͯ͠Δ

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• 4QSJOH%BUB3FEJT3FBDUPS • PSHTQSJOHGSBNFXPSLCPPUTQSJOHCPPUTUBSUFSE BUBSFEJTSFBDUJWF • 3FBDUJWF3FEJT0QFSBUJPOT&YUFOTJPOT˞͕ • 3FBDUJWF3FEJT0QFSBUJPOTʹTVTQFOEJOHGVODUJPO Λ֦ுͯ͠௥Ճ • HFU"OE"XBJU • TFU"OE"XBJU ʜ • .POP5Ͱؼͬͯ͘Δϝιουʹରͯ͠ BXBJU4JOHMF Ͱ΋0, ,PUMJO$PSPVUJOFͱ3FBDUJWF3FEJT ˞ग़యɿIUUQTHJUIVCDPNTQSJOHQSPKFDUTTQSJOHEBUBSFEJTCMPCNBJOTSDNBJOLPUMJOPSHTQSJOHGSBNFXPSLEBUBSFEJTDPSF3FBDUJWF3FEJT0QFSBUJPOT&YUFOTJPOTLU

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• 4QSJOH%BUB3%#$ • PSHTQSJOHGSBNFXPSLEBUBTQSJOHEBUBSECD • 3%#$ʜϦΞΫςΟϒʹ42-σʔλϕʔεͱ࿈ܞ͢Δ ࢓༷˞ • .Z42- %SJWFS EFWNJLVSECDNZTRM ˞˞ • %#ͷεΩʔϚ͔ΒJOTFSUTFMFDU༻ͷEBUBDMBTTΛੜ੒͢Δ HSBEMFλεΫΛ։ൃ ,PUMJO$PSPVUJOFͱ3%#$ 3FBDUJWF3FMBUJPOBM%BUBCBTF$POOFDUJWJUZ ˞ग़యɿ IUUQTTQSJOHQMFJBEFTJPQSPKFDUTTQSJOHEBUBSECD IUUQTTQSJOHQMFJBEFTJPTQSJOHEBUBSECDEPDTSFGFSFODFIUNMSFGFSFODF ˞˞ग़యɿ IUUQTHJUIVCDPNNJSSPNVUUISECDNZTRM

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• 1SPT • ίʔυͷݟ௨͕͠ྑ͍ • ೉͘͠ͳΓ͕ͪͳඇಉظॲཧΛ؆ܿʹ͔͚Δ • ύϑΥʔϚϯε͕͍͍ • $POT • 4USVDUVSFE $PODVSSFODZͷ֓೦͕΍΍ͱ͖ͬͭʹ͍͘ • ಛʹΤϥʔͷ఻ൖ͋ͨΓ • *%&ͷαϙʔτ͕௥͍͍͓ͭͯΒͣσόοΨ͕ͨ·ʹޮ͔ͳ͍ • ελοΫτϨʔε͕೉͍͠ ,PUMJO$PSPVUJOFಋೖͯ͠Έͯ

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• +40/ఆٛͰফ໣͠ͳͯ͘Αͯ͘ྑ͍ • 1SPUPCVGͷΧελϜΦϓγϣϯͰೝূͷ༗ແͳͲΛίʔυʹམͱͨ͠Γ • αʔόʔɺΞϓϦɺϑϩϯτʢ8FC $.4 ͱ୲౰ऀ͕͍Δ͕ᴥᴪ͕ى͖ʹ͍͘ • ΞϓϦͱ$.4͸ಉ͡31$Λ࢖͍ͬͯΔ • αʔόʔͷϦϙδτϦͷQSPUPΛDMPOFͯ͠QSPUP༻ͷผϦϙδτϦΛެ։ • 4FSWFSTUSFBNJOH31$ • ৄࡉը໘ͰϥΠϒ͕։࢝ͨ͠λΠϛϯάͰࣗಈͰ-*7&ը໘ʹભҠ͢Δͷʹར༻ • ఆظతʹ1*/(ͷΑ͏ͳϨεϙϯεΛૹͬͯΫϥΠΞϯτ͕͢Ͱʹ੾அ͍ͯͨ͠Βྫ֎͕ى͖ΔͷͰ ૹ৴ΛࢭΊΔΑ͏ͳ࣮૷Λ͍ͯ͠Δ • -PBE CBMBODFS͕Ұఆ࣌ؒͰίωΫγϣϯΛ੾ͬͯ͠·͏ͷͰΫϥΠΞϯτଆ͔Β࠶઀ଓ͍ͯ͠Δ H31$ ಋೖͯ͠Έͯ

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• ϚΠΫϩαʔϏε • υϝΠϯ͝ͱͷ*'͕ͱͯ΋໌֬ʹͳΔͷͰɺ݁Ռͱͯ͠ίʔυ͕៉ྷͳؾ͕͢Δ • ௨৴ઌͳͲͷαʔϏε͕ࢮΜͰ΋Өڹͳ͍Α͏ʹ࡞Βͳ͖Ό͍͚ͳ͍ͷͰΤϥʔ ϋϯυϦϯά͕ͱͯ΋ॏཁʹͳΔ • ࢮͳͳͯ͘΋σϓϩΠ࣌ͳͲॠஅ͕͋Γ͑Δ • αʔϏεؒʹґଘؔ܎͸͋Δ͚ΕͲɺσϓϩΠॱΛؾʹ͠ͳ͍͍ͯ͘Α͏ʹ࡞Βͳ͍ͱ͍͚ͳ͍ • ,VCFSOFUFT • ΍͸Γಠࣗͷ֓೦͕೉͍͠ • LVTUPNJ[FͰ؀ڥ͝ͱʹPWFSMBZ࡞͍ͬͯΔ • :".-ಡΉͷ͕ͭΒ͍ • ͜ΕΛݟΕ͹શઃఆ͕ॻ͍ͯ͋Δͱ͍͏ͷ͸ྑ͍ ϚΠΫϩαʔϏεɾ,VCFSOFUFT ಋೖͯ͠Έͯ

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• 3%#$ • ͍ͭʹ.Z42- ESJWFSͷ࣮૷͕Ͱ͖ͨͷͰɺΑ͏΍͘ಋೖͰ͖ͨ • αϯϓϧͰ͸ΧϥϜ໊ΛจࣈྻͰࢦఆ͍͕ͯͨ͠ɺ,1SPQFSUZ͔ΒऔಘͰ͖ΔΑ͏ ʹͯ͠2VYJEΈ͍ͨʹऔΕΔΑ͏ʹ͍ͯ͠Δ • 3FBDUPSʹ΋͋Δఔ౓ৄ͘͠ͳ͍ͱΤϥʔ͕ى͖ͨ࣌ͱ͔ʹௐ͕ࠪ೉͍͠ 3FBDUJWF3%#$ ಋೖͯ͠Έͯ

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• ৽αʔϏε։ൃʹ͋ͨΓɺ,PUMJOΛ࠷ॳ͔Β౤ೖɾ׆༻ͯ͠Α͔ͬͨ • ࠓͳΒ4QSJOH΍पลϥΠϒϥϦ΋͍ͩͿ$PSPVUJOFΛαϙʔτ͍ͯ͠Δ ·ͱΊ ˞ग़యɿIUUQTEPDTTQSJOHJPTQSJOHGSBNFXPSLEPDT.TQSJOHGSBNFXPSLSFGFSFODFMBOHVBHFTIUNMDPSPVUJOFT

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• ʢ౔ʣ EBZબߟձ͕͋Γ·͢ʂ • IUUQTMJOFDPSQDPNKBDBSFFSMQEBZIJSJOH • ΤϯτϦʔక੾ ʢ݄ʣத • ๻΋͍·͢ • ͳΜͱαʔόʔαΠυਓͳΜͰ͢ • ͲΜͳ࢓ࣄʁ • େن໛αʔϏεΛ໨ࢦ͢ͱ͸͍͑ɺ࡞Δ΋ͷ͸͋·ΓมΘΓ·ͤΜ • ஍ಓʹػೳػೳ • ܾࡁɾ঎඼ɾ഑৴؅ཧʜ • ͱ͸͍ٕ͑ज़ͷྗΛ࠷େݶʹ׆͔͍ͯ͠·͢ 8&"3&)*3*/(

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THANK YOU