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"Microservices" is dead.
 Long live "Microservices". @qsona / FiNC Technologies Inc. 2018-12-21 ۜ࠲Rails#4 @ϦϯΫΞϯυϞνϕʔγϣϯ #ginzarails

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"Microservices fundamentalism" is like abstinence-only sex ed: ϚΠΫϩαʔϏεݪཧओٛ͸ɺېཉͷΈ͔ΒͳΔੑڭҭͷΑ͏ͩɻ

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Over the years, the "Microservices rhetoric" got louder and angrier. More mean-spirited. ௕೥ʹΘͨͬͯɺϚΠΫϩαʔϏεͷϨτϦοΫ
 (੣࣮͞ͷͳ͍ඒࣙྷ۟)͸ɺ ͏Δ͘͞ɺౖΓͬΆ͘ɺڱྔʹͳ͖ͬͯͨɻ

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͜Ε͸ͳʹ • TDD is dead. Long live testing. (by DHH)
 ͱ͍͏໊ΤϯτϦͷվม • ͝ଘ͡ͳ͍ํ͸
 ςετۦಈ։ൃ
 ෇࿥CΛඞಡʂ

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Θͨ͠͸ͩΕ • @qsona, ϚΠΫϩαʔϏεԺ݈೿

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Microservices ݪཧओٛʁ

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ྫ: ίϯ΢ΣΠͷ๏ଇ • ૊৫ͷߏ଄ͱٕज़ͷߏ଄͸Ұக͍ͯ͘͠ɺͱ ͍͏๏ଇ

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ίϯ΢ΣΠͷ๏ଇݪཧओٛ • 1αʔϏεɾ1νʔϜ͡Όͳ͍ͱͩΊ • ૊৫ΛׂΒͳ͍ͳΒɺαʔϏεΛׂΔҙຯ͸ ͳ͍ • 100ਓҎ্ͷ૊৫͡Όͳ͚Ε͹΍ͬͪΌͩΊ

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※ಉ྅Ͱ͢(@ota42y͞Μ)

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(ͪͳΈʹ಺༰͸͍͍ͩͨಉҙ) it depends... agree

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Microservices ݪཧओٛ...? • গͳ͘ͱ΋ Martin Fowler ΍ Sam Newmanͷ ͜ͱͰ͸ͳ͍ • ൴Βͷൃ৴͸ɺͱͯ΋ͱͯ΋੣࣮ • Ұ෦Λ੾Γऔ֦ͬͯେղऍ͠ɺڧ͗͢Δൃ৴ ͕ͳ͞ΕΔ͜ͱ͕͋Δ

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qsonaͷॴײ • શͯͷڧ͍ҙݟ (ݪཧओٛ) ͸ɺ͋ΔίϯςΩετΛ ݩʹൃ৴͞ΕΔ • ࣮ࡍͷݱ৔Λࢧ͑ΔΞϓϦέʔγϣϯΤϯδχΞͷ ࢹ఺͸ɺஔ͍͚ͯ΅Γʹ͞Ε͍ͯΔΑ͏ʹײ͡Δ • ࠷ۙɺϚΠΫϩαʔϏεͱ͍͏ݴ༿Λൃ͢Δͷ͕͸ ͹͔ΒΕΔΑ͏ʹͳͬͨ...

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qsonaͷॴײ • "counterintuitive ram" (௚ײʹ൓͢Δഁ৓Ṁ) ͱͯ͠ɺݱঢ়Λม͑ΔͨΊʹɺݪཧओٛతͳ ҙݟΛڣͿɺͱ͍͏͜ͱ͸͋Δ͕.... • Microservices ʹ͓͍ͯɺͦ͏͍͏ϑΣʔζ͸ ੈքతʹݟͨΒͱͬ͘ʹա͗ڈ͍ͬͯΔ

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qsonaͷॴײ • ίϯ΢ΣΠͷ๏ଇݪཧओٛͰ͍͏ͱ... • ٕज़ͱಉ༷ɺ૊৫΋΍͸Γ໨తͰ͸ͳ͍ • ٕज़ͱ૊৫ͷ྆ྠͰɺϏδωεɾϓϩμΫτʹ޲͖߹͍ͬͯ͘΋ ͷ • ٕज़ͷϦΞʔΩςΫτʹ͸͕͔͔࣌ؒΔ • αʔϏεͷ୯Ґ = ૊৫ ͕ৗʹ੒Γཱͭ΄ͲϏδωε͸୯७Ͱ͸ͳ͍ • ݪཧओٛతओு͸ɺݱ৔ͷ໰୊ͱઓ͏ਓʹ͸ڹ͔ͳ͍

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What is "Microservices" ? • ҰݴͰ͸આ໌Ͱ͖ͳ͍͠ɺ໌֬ͳఆٛ΋ͳ͍ • ίϯηϓτͷू߹ͱɺपลͷΤίγεςϜͱ ͯ͠ଊ͑ͯ΄͍͠

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"Microservices" as a Concept • ϏδωευϝΠϯͰαʔϏεΛ෼ׂ͢Δ͜ͱ • αʔϏεͷ౷߹ʹ͸ඪ४ͷٕज़Λ࢖͏͜ͱ • ୯Ұ੹೚ݪଇɺૄ݁߹ͱߴڽूɺetc • ϚΠΫϩαʔϏεͷʮྑ͞ʯΛ୲อ͢ΔྖҬ • ॳग़͔Βશ͘มΘ͍ͬͯͳ͍

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"Microservices" as an Ecosystem • Docker, Kubernetes, ECS / GKE • CI/CD πʔϧ • Envoy, Service Mesh (Istio, AWS App Mesh) • ϚΠΫϩαʔϏεͷʮσϝϦοτʯΛফ͢ྖҬ • ೥ʑਐԽ͍ͯ͠Δ

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Concept & Ecosystem • ίϯηϓτΛ஌Γɺඞཁͳͱ͖ʹऔΓೖΕΔ͜ͱͰɺϝ ϦοτΛڗड͠ɺ • ΤίγεςϜʹ͏·͘৐Δ͜ͱͰɺ
 σϝϦοτΛݮΒ͢ • ͦ͏͍͏͏·͍෇͖߹͍ํΛ͢Ε͹ɺϚΠΫϩαʔϏε ͸ΈΜͳͷຯํʹͳΔ • ͱ͍͏ओுΛ͜Ε͔Β͍͖͍ͯͨ͠

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গ͠୤ઢ

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Q. Mircoservices Λ΍ͬͪΌ͍ ͚ͳ͍ձࣾ͸ʁ • ͳ͍…ͱ͍͍͍͕ͨɺ͋Δ͔΋͠Εͳ͍ • ௒ελʔτΞοϓͰ • ·ͩϓϩμΫτΛϩʔϯνͯ͠ͳͯ͘ • ΤϯδχΞ͸ֶੜ͚ͩ...

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FiNC ❤ Microservices • "ϚΠΫϩαʔϏε" ͱ͍͏ݴ༿Λ஌Βͳ͍͏ͪ ͔ΒϚΠΫϩαʔϏεΛࢦ޲͍ͯͨ͠ • ʮҰੜʹҰ౓ͷ͔͚͕͑ͷͳ͍ਓੜΛαϙʔτ ͢ΔʯͨΊͷ Microservices Λ΍Γ͍ͨਓ͸੠ Λ͔͚ͯ΄͍͠ • We are hiringɺਅ݋ʹ࠾༻΍ͬͯ·͢

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શͯͷձ͕ࣾͦ͏Ͱ͸ͳ͍ • ՝୊ͷઃఆ͸༷ʑɺ໨త΋༷ʑ • ਎ۙͳ໰୊Λղܾ͢Δձࣾ΋͋Δ • খ͞ͳϓϩμΫτΛ࡞Γଓ͚Δձࣾ΋͋Δ • ͦ͏͍͏ձࣾ΍ΤϯδχΞʹͱͬͯɺ
 Microservices ͸ແԑͳͷ͔ʁ

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To be continued...

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Rails and Microservices • Rails ͔ΒݟΔͱɺ Microservices ͸
 ࣗ෼ͱ͸ҧ͏ྖҬͷ໰୊Λղܾ͢Δଘࡏ • Rails ʹ଍Γͳ͍ͱ͜ΖΛ
 Microservices Ͱิ׬Ͱ͖Δ

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͓·͔ͤ vs ΞϥΧϧτ

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Easy vs Simple ;ͭ͏ͷRailsΞϓϦέʔγϣϯ։ൃ, Takafumi ONAKA https://www.slideshare.net/takafumionaka/rails-77195340

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"Easy" is Difficult. • Easy Λҡ࣋͢Δͷ͸Ή͔͍ͣ͠

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Is Rails "Easy"? • Rails ͸ͲΜͳ໰୊ʹର͢Δ౴͑Λ༻ҙͯ͠Δ Θ͚Ͱ͸ͳ͍ • ͦΜͳສೳͳEasy͸ଘࡏ͠ͳ͍

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Rails ͱ େن໛։ൃ

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Rails ͱ େن໛։ൃ • جຊతʹ͸ "தن໛" ·ͰͷΞϓϦέʔγϣϯ Λߴ଎ʹ࣮૷͢Δͷʹ޲͍͍ͯΔ • େن໛ʹͳΔͱ೉͘͠ͳΔଆ໘͋Γ • ੩తܕ෇͚, ϞδϡʔϧԽ, Dependency Injection, Event sourcing ͷ࢓૊ΈͳͲ͸ͳ͍

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Rails Λ֦ு͢Δʁ • Service Object, Form Object • Decorator • Trailblazer • ...

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Rails Λ֦ு͠ͳ͍ • ͋Δఔ౓ͷൣғ·Ͱ͸ Rails ( + PlainͳΫϥ ε ) Ͱ͏·͘΍Γ • Rails Ͱ͏·͘΍ΕΔൣғΛӽ͖͑ͯͨΒɺ αʔϏεΛ෼ׂ͍ͯ͘͠ɺͱ͍͏ߟ͑ํ

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ྫ: Πϕϯτιʔγϯά • ୯ҰͷRailsαʔϏε಺ͰΠϕϯτιʔγϯά ͢ΔͱɺͦΕͳΓʹ໰୊͕ى͖΍͍͢ • ActiveRecordͷcallbackΛ࢖͏ͱɺҙਤͤͣ ʹൃಈ͢Δ໰୊͕ى͖͕ͪ • transaction ͷൣғ͸ʁ

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Ұͭͷߟ͑ํ • ୯ҰͷRailsαʔϏε಺Ͱ͸ɺΠϕϯτιʔγϯά͠ͳ͍ (callback͸͘͝ݶఆత༻్Ͱ) • ͦͷ͔ΘΓɺ୯ҰαʔϏε಺ͷtransaction͸୲อ͢Δ • ෳ਺αʔϏεؒ͸Πϕϯτιʔγϯά͠ɺ݁Ռ੔߹ੑΛ ୲อ͢Δ • ྫ͑͹ GCPͷ Cloud Pub/Sub ࢖͏

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ϝϦοτΛड͚Δ͜ͱͱɺ σϝϦοτ΁ͷରॲ • ݸผσϓϩΠ, ো֐ہॴԽ, ݸผεέʔϦϯά ͳͲͷԸܙΛಉ࣌ʹड͚Δ • ෼ࢄΩϡʔ, ෼ࢄτϨʔγϯά, etc... ͷۤ͠Έ Λड͚Δ • ͜ΕΛࢧ͑ΔΤίγεςϜ͸ݱࡏඇৗʹ੝Γ ্͕͍ͬͯΔ

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Rails ͱ γεςϜ෼ׂ

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γεςϜ෼ׂͷ؍఺ • جຊతʹRailsαʔϏε͕Ͱ͔͘ͳΔͱਏ͍ͷͰɺԿ Β͔ͷ෼ׂͨ͘͠ͳΔ (ͱ͜͜Ͱ͸Ծఆ͢Δ) • ٕज़తͳ؍఺ʹԊͬͯ෼ׂ͢Δਓ͕ଟ͍ • ؅ཧը໘Railsɺόον༻Railsɺetc... • ϚΠΫϩαʔϏεͰ͸ɺϏδωευϝΠϯʹͦͬͯ ෼ׂ͢Δ

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Α͋͘ΔγφϦΦ • αʔϏεͷϦϦʔεͱ؅ཧը໘ͷϦϦʔε͸෼཭͍ͨ͠ Ͷɾɾɾ • ؅ཧը໘༻ͷRails͕ര஀ • Shared Database Pattern ΍ Shared ORM Pattern (෼அ͞ ΕͨϞϊϦε) • ςʔϒϧͷεΩʔϚมߋͳͲ͕͓ޓ͍ʹӨڹ͢ΔΑ͏ʹ ͳͬͯਏ͍

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Α͋͘ΔγφϦΦ • ؅ཧը໘Λ෼཭͍͚ͨ͠Ͳɺڞ༗DB͸Ξϯν ύλʔϯͩΑͶɾɾɾ • ؅ཧը໘͸Single Page AppͰ࡞Δ • ؅ཧը໘޲͚ͷAPIΛ͕Μ͹ͬͯ։ൃ͢Δ • ͦΕ͸ Rails ΤϯδχΞͷຊ๬ͩͬͨͷ͔...?

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Rails ͷྑ͞Λੜ͔͍ͨ͠ • View·ͰαΫοͱศརʹ࡞ΕΔͷ͕Railsͷྑ ͞͡Όͳ͍͔ • ؅ཧը໘ΛSPAʹ෼཭ͱ͔ɺࢷΛམͱͨ͠ ύοαύαͷRailsͰ͸...

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ϏδωευϝΠϯͰ෼ׂ͠Α͏ • ϏδωευϝΠϯͷڥքΛݟ͚ͭΑ͏ • Domain-Driven Design ͷग़൪ • ͦͷڥքʹԊͬͯ෼ׂ͠Α͏ • ͦͷ͔ΘΓɺ؅ཧը໘·Ͱ֤αʔϏεͰఏڙ ͠Α͏

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؅ཧը໘ͷ౷߹͸ʁ • ͜ͷํ๏ʹ͢Δͱɺ؅ཧը໘͕ࢄΒ͹Δ • ΞΧ΢ϯτ • σʔλͷ౷߹ • UIͷ౷߹/౷Ұײ

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ΞΧ΢ϯτͷ౷߹ • SAML ౳ͷඪ४ٕज़Λར༻ͨ͠ Single Sign-onΛ࣮૷ ͢Δ (language-agnostic) • ͦͷ্ͰɺRailsʹ޲͚ͨศརͳํ๏΋༻ҙ͢Δ • ྫ͑͹ɺ Rails Engine ͷgemΛಋೖ͢Δ͚ͩͰͰ͖ ΔΑ͏ʹ͢Δ • ඪ४ + ศརϥΠϒϥϦͷೋஈߏ͑

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σʔλͷ౷߹ • લఏͱͯ͠ɺσʔλΛ౷߹ͯ͠ѻ͏͜ͱʹ͸ σϝϦοτ΋͋Δ • ݸਓͷηϯγςΟϒͳ৘ใͷΞΫηείϯ τϩʔϧ͕೉͘͠ͳΔ

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σʔλͷ౷߹ • ࠷௿ݶͷ৘ใ͸APIͰ࿈ܞ͢Δ • ৔߹ʹΑͬͯ͸ڞ༗DB (֎͔Β͸ Read Only) • εΩʔϚมߋͰ؅ཧը໘͕յΕΔՄೳੑ͕ ͋Δ͕ɺ਺೔ͷμ΢ϯλΠϜ͕ڐ͞ΕΔͳ ΒͦΕͰ΋͍͍

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UIͷ౷߹ • ϦϯΫू΍ɺڞ௨ͷϔομʔ͕͋Ε͹ڐ͞Ε ΔͳΒͦΕͰ͍͍ • ແཧͯ͠౷߹͢Δͱେม • ෳ਺ͷαʔϏεͷίϯϙʔωϯτΛɺ΋ͬͱ ߴ౓ʹ౷߹ɾ࿈ܞ͍ͯ͘͠ʹ͸ɾɾɾʁ

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Micro Frontends • ͜ͷಓΛಥ͖٧Ί͍ͯ͘ͱ Micro Frontends
 ͱ͍͏ΞʔΩςΫνϟʹͳ͍ͬͯ͘ • ֤αʔϏε͕ Web Components Λఏڙ͠ɺ
 ౷߹ϨΠϠʔ͕ͦΕΒΛ഑ஔ͢Δ • ֤Component͸ΠϕϯτͳͲͰڠௐͯ͠ಈ͘

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ྲྀΕͷ͓͞Β͍ • ϏδωευϝΠϯͰ෼ׂ͢Δ (ίϯηϓτ) • αʔϏε෼ׂΛߦ͍ͳ͕Β΋ɺ
 ؅ཧը໘͕؆୯ʹͭ͘ΕΔ (ϝϦοτ) • ؅ཧը໘ͷମݧ౳͕෼ׂ͞ΕΔ (σϝϦοτ) • ؅ཧը໘ͷ౷߹ΛɺඞཁʹԠͯ͡
 ஈ֊తʹߦ͍ͬͯ͘ (ΤίγεςϜͷࢧԉ)

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఻͍͑ͨ͜ͱ • ʮϏδωευϝΠϯͰ෼ׂ͢Δʯ
 = ίϯηϓτ • ͦΕʹΑΓϝϦοτ͕ಘΒΕΔ • ͦͷίϯηϓτͷ΋ͱʹΤίγεςϜ͕ൃల ͠ɺಓ͸੔උ͞Ε͍ͯ͘

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FiNC ❤ Micro Frontends • Micro Frontends ͷಓ͸զʑ͕ઌಋ͢Δ • ຊ౰ʹඞཁͱ͍ͯ͠Δ͔Β΍Δ • ΋ͪΖΜɺ୭΋͕ඞཁͱ͢ΔΞʔΩςΫνϟͰ ͸ͳ͍ • େࣄͳͷ͸ɺઌʹਐΈ͍ͨͱ͖ͷಓ͕͋Δ͜ͱ

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͔͜͜Β͸ࡶଟͳ࿩

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Rails ͱ Ϋϥ΢υαʔϏε

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Rails ͱ Ϋϥ΢υαʔϏε • Web αʔϏεͷकඋൣғͷ֦େ • ྫ͑͹ IoT ͷձࣾ => AWS IoT ͱͦͷपลͷ ϚωʔδυαʔϏεΛϑϧ׆༻͍ͨ͠ • ͚ͩͲɺWebαʔϏε΍ϞόΠϧΞϓϦ޲͚ API͸ Rails Ͱఏڙ͍ͨ͠

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ΞʔΩςΫνϟͷҰྫ • Web αʔϏε͸ Rails • AWS ޲͚ʹ͸ Serverless Framework Λར༻͢Δ • ࣮ଶͱͯ͠͸ AWS Lambda ʹσϓϩΠ͞ΕΔ • ϝϦοτ • Web API ΍ SNS/SQSͰͷΠϕϯτͳͲɺ࿈ܞΛ͢Δͷ͕؆୯ʹग़དྷΔʂ • AWS IoT ΍ DynamoDB ͳͲͷ௿ϨϕϧͳίϯϙʔωϯτΛ Rails ͕ҙࣝ ͠ͳ͍Ͱྑ͘ͳΓɺૄ݁߹ʹͳΔ

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ٕज़ҟ࣭ੑ / Language-agnostic

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Language-agnostic • ϓϩάϥϛϯάݴޠʹඇґଘͳٕज़બఆ • ྫ: Sidecar Pattern (Envoy ͳͲ)

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"ඪ४"΁ͷҙࣝ • ݴޠඇґଘͳ෦෼Λଟ͘࢒͢બ୒
 => ٕज़ͷඪ४ੑʹҙ͕ࣝ޲͘ • ٕज़બఆʹ͓͚Δɺࢹ఺ͷ޿͕Γ

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ྫ: Web API ࢓༷ • Web API ΛͲͷΑ͏ͳܗࣜͰఏڙ͢Δ͔? • RESTful + JSON + OpenAPI • RESTful + ಠࣗϑΥʔϚοτ + JSON + Open API • JSON API (RESTfulͳAPIͷҰͭͷ࢓༷) • Netflix/fast_jsonapi : JSON API ܗࣜΛαϙʔτ͢Δgem • GraphQL + JSON • gRPC + Protocol Buffers

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ྫ: Web API ࢓༷ • ΋ͪΖΜɺ།Ұͷ౴͑͸ͳ͍͕… • ͲͷΑ͏ͳࢹ఺Λ΋ͬͯબఆ͢Δ͔ • ໨ͷલͷ՝୊ʹରॲ͢Δ͜ͱ͸ɺ
 ΋ͪΖΜେࣄ͕ͩ • ଞݴޠͰ΋࣮૷Ͱ͖Δ͔ʁͱ͍͏ࢹ఺Λ΋ͭ

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ྫ: Web API ࢓༷ • RESTful + OpenAPI ͳΒɺ࠷ѱOpenAPI͕ඇରԠͷݴޠΛ ࢖ͬͯ΋μϝʔδ͕গͳ͍ • ಠࣗϑΥʔϚοτ΍ࣗલϥΠϒϥϦΛఆٛ͗͢͠Δͱɺଞͷݴ ޠʹߦͬͨͱ͖ʹ͖͍ͭΑͶ.. • JSON API, GraphQL, gRPC • ίϛϡχςΟͷαϙʔτঢ়گ͸Ͳ͏͔ʁ • ࠷ѱɺࣗ෼Ͱ࣮૷ͨ͠ΓOSSߩݙͰ͖ΔϨϕϧ͔ʁ

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"ඪ४" ΁ͷؔ৺ • ඪ४Խ΍ίϛϡχςΟαϙʔτʹର͢Δؔ৺ ͸ɺٕज़తͳ੒௕Λଅ͢ɺͱ͍͏Ծઆ

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·ͱΊ

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·ͱΊ • ·ͱ·Γ·ͤΜͰͨ͠ɺ͝ΊΜͳ͍͞ • ׬શͳΔྗྔෆ଍ • ࿦ཧͷཪ෇͚΋গͳ͔ͬͨ... • λΠτϧͰ௼ͬͯ͢Έ·ͤΜͰͨ͠...͢Έ·ͤ Μ͢Έ·ͤΜ...

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ݴ͍͔ͨͬͨ͜ͱ • "ϚΠΫϩαʔϏε" ͱ͍͏ݴ༿ʹଉۤ͠͞Λײͨ͘͡ͳ ͍ɾײͯ͡΄͘͠ͳ͍ • RailsΤϯδχΞʹ "ࣗ෼ʹ͸ϚΠΫϩαʔϏε͸ؔ܎ͳ͍" ͳΜͯࢥͬͯ΄͘͠ͳ͍ • খ͞ͳ૊৫Ͱ΋ϚΠΫϩαʔϏεΛҙ͍͍ࣝͯ͠ • "ϚΠΫϩαʔϏε΍ͬͯ·͢" ͬͯݴͬͨΒୟ͔ΕΔੈͷ த͸·ͬͽΒͩ

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ݴ͍͔ͨͬͨ͜ͱ • ίϯηϓτΛཧղ͠ɺ͏·͘औΓೖΕΔͱ͜ Ζ͔Β࢝ΊΑ͏ • ΤίγεςϜΛ஌Γɺ
 ͏·͘৐Γ͜ͳͦ͏

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"Microservices" Everywhere.