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ソフトウェアアーキテクチャ入門
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Ogata Katsuya
September 13, 2025
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ソフトウェアアーキテクチャ入門
Ogata Katsuya
September 13, 2025
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Transcript
2025-09-14 / ॳ৺ऀ͚νʔϜ։ൃϒʔτΩϟϯϓ #4 ٕज़ෛ࠴Λ࡞Βͳ͍ͨΊͷ ιϑτΣΞΞʔΩςΫνϟೖ Katsuya Ogata
ࣗݾհ • ໊લ: ॹํ ࠀ࠸ (͓͕ͨ ͔ͭ) • ॴଐ: େࡕେֶใֶݚڀՊ
• झຯ: ొࢁ/ਭ/৯ࣄ • ࠷ۙϋϚͬͯΔ͜ͱ: ࣗαʔόʔ • X: @ogata_katsuya • ݸਓ: www.ogatakatsuya.com
ॳ৺ऀ͚νʔϜ։ൃϒʔτΩϟϯϓ #4
ຊߨ࠲ͷత AI࣌ʹ௨༻͢ΔΤϯδχΞϦϯάྗཆߨ࠲ • AI͕ίʔυΛϞϦϞϦॻ͍ͯ͘ΕΔ͔Βͦ͜ɺઃܭྗνʔϜ։ൃͷεΩϧ ͕ɺΑΓڧ͘ٻΊΒΕ͍ͯΔ • όΠϒίʔσΟϯάΛߦ͏͜ͱʹΑΓɺجૅతͳٕࣝज़Λ࣋ͨͳ͍·· ϓϩμΫτ։ൃΛߦͳ͍ͬͯ͘ͷةݥʂ • ΑΓAIΛຯํʹ͚ͭͯɺΑΓྑ͍ΤϯδχΞϦϯάΛ͍ͯͨ͘͠Ίͷߨ࠲
ॳ৺ऀ͚νʔϜ։ൃϒʔτΩϟϯϓ #4
ΞʔΩςΫνϟͱʁ ͳʹͦΕ͓͍͍͠ͷʁʁ🤤 • γεςϜશମͷࢥ • ॊೈʹมԽ͢ΔͷΛड͚ೖΕΔͨΊʹɺมԽͤ͞ͳ͍γεςϜͷࠎΈ • ཁ༷݅มΘ͍ͬͯ͘ͷͩͱఆ͢Δ • ͦͷ্ͰɺॊೈʹରԠͰ͖ΔΑ͏ͳΞʔΩςΫνϟΛબ͢Δ
• ϓϩδΣΫτͷ్தͰΞʔΩςΫνϟΛ৽͢Δ͜ͱඇৗʹίετͱϦεΫ ͕ߴ͘ͳͬͯ͠·͏ • ϓϩδΣΫτͷॳظʹ৻ॏ͔ͭ൵؍తʹઃܭΛ͢Δ͜ͱ͕؊ཁ
ιϑτΣΞΞʔΩςΫνϟ ͳͥιϑτΣΞΞʔΩςΫνϟ͕ॏཁͳͷ͔ • AIਖ਼͘͠ಈ͍ͯ͘ΕΔίʔυΛੜ͢Δ͜ͱʹ͚͍ͯΔ • ͔͠͠ɺظతͳઢͰݟͨͱ͖ʹɺ࠷ྑͱݴ͑ͳ͍ • ৽͍͠ϝϯόʔ͕ίʔυΛཧղ͢Δͷʹ͕͔͔࣌ؒΔ • ػೳՃΛ͠Α͏ͱࢥͬͨΒมߋՕॴ͕େʹͳΔ
• όά͕ൃੜ͍͢͠ίʔυʹͳͬͯ͠·͏ • ਓ͕ؒཧղͰ͖ͳ͍ίʔυʹͳͬͯ͠·͏
ιϑτΣΞΞʔΩςΫνϟ ͳͥιϑτΣΞΞʔΩςΫνϟ͕ॏཁͳͷ͔ • ΞʔΩςΫνϟɺAIʹʮͲΜͳܗͰίʔυΛॻ͔ͤΔ͔ʯͷʹͳͬͯ͘ ΕΔ • ςετΛॻ͖͘͢ͳΔ • Λదʹ͢Δ͜ͱͰۀ͕͘͢͠ͳΔ •
ΞʔΩςΫνϟΛઃఆ͓ͯ͘͜͠ͱͰɺͦΕҎ߱ͷAIͷग़ྗ҆ఆͯ͘͠Δ
ຊߨٛͷείʔϓ • Δ͜ͱ • ྑ͍ίʔυΛॻͨ͘Ίͷٕज़ • อकੑɾ֦ுੑΛ࣋ͬͨιϑτΣΞΞʔΩςΫνϟ • Βͳ͍͜ͱ •
ϚΠΫϩαʔϏε or ϞϊγϦοΫ • ΠϯϑϥͷབྷΉγεςϜઃܭ
͓ॻ͖ 1. ྑ͍ίʔυΛॻͨ͘Ίͷٕज़ 2. ϨΠϠʔυΞʔΩςΫνϟͷհ 3. ( ͕࣌ؒ͋Ε ) ࣮ફྫ
4. ίʔυ࣭ͱτϨʔυΦϑ 5. ·ͱΊ
1. ྑ͍ίʔυΛॻͨ͘Ίͷٕज़
Bad Code
Good Code
ωετΛਂ͘͠ͳ͍ Early returnͱcontinue/breakΛ׆༻͢Δ • ifจͷωετ͕ਂ͘ͳΔͷΛ͙ • 🙅 If A ->
if B -> ॲཧ • 🙆 If !A return -> if !B return -> ॲཧ • forจதͷifจcontinue/breakΛ༻͍͙ͯ͢ൈ͚Δ
Bad Code
Good Code
σʔλͱॲཧ͍ۙॴʹஔ͘ ϏδωεϩδοΫσʔλΫϥεʹدͤΔ • σʔλΫϥεʹؔ࿈͢ΔϩδοΫಉ͡ॴʹஔ͘ • σόοΫ༷࣌มߋ࣌ʹՄಡੑɾมߋ༰қੑ্͕͢Δ • σʔλΫϥεͷॳظԽ࣌ʹෆਖ਼͕ೖΒͳ͍Α͏ʹݕূ͢Δ • ϩʔΧϧมΛΠϛϡʔλϒϧʹ͢Δ͜ͱͰ༧ظͤ͵্ॻ͖Λ͙
• PythonͰͰ͖ͳ͍͕ɺϝιουͷҾΠϛϡʔλϒϧʹ͢Δͱྑ͍
Bad Code
Good Code
σʔλܕΛ׆༻͢Δ ؔͷΓʹܕΛར༻͢Δ • ؔͷΓʹϓϦϛςΟϒܕ(bool, int, fl oat, double, string)͔͠༻͍ͳ͍ •
ϓϦϛςΟϒܕࣥண • ΓͷΞϊςʔγϣϯʹσʔλܕΛ༻͍Δ͜ͱͰɺՄಡੑΛ্ͤ͞Δ • ΤϥʔͱҰॹʹ݁ՌΛฦ͢Resultܕͱ͍͏ͷଘࡏ͢Δ • TypeScript, Rust, Golang etc…
Bad Code
Good Code
Λదʹ͢Δ ୯Ұͷ๏ଇ / ؔ৺ͷ • ͳΜͰͰ͖ͪΌ͏Ϋϥε(ਆΫϥε)Λ࡞Βͳ͍ • ʹԠͯ͡దʹ͚ͯ͋͛Δ • ςετ͕Γ͘͢ͳΔ
• ϦϑΝΫλϦϯά͕͘͢͠ͳΔ • ֤ίϯϙʔωϯτΛૄ݁߹ʹอͭ͜ͱ͕ॏཁ • SOLIDݪଇΛࢀর͢Δͱྑ͍
ΠϯλʔϑΣʔεͱϩδοΫΛ͢Δ ϩδοΫΛӅṭͯ͠ΠϯλʔϑΣʔε͚ͩΛެ։͢Δ • ϩδοΫ͕ີ݁߹ʹͳΒͳ͍ͨΊʹɺΠϯλʔϑΣʔεʹґଘͯ͠Β͏ • มߋ༰қੑ / Մಡੑ্͕͕Δ • νʔϜ։ൃ͕Γ͘͢ͳΔ
• ܨ͗͜ΈͷࡍʹɺΠϯλʔϑΣʔε͚ͩΛҙࣝ͢Εྑ͍ • ࠓޙɺ͞ΒʹՃ͞ΕΔՄೳੑ͕͋Δͳͱ͍͏࣌ʹ͏ͱྑ͍ • ΠϯλʔϑΣʔεͷߟ͑ํΛ׆༻Ͱ͖ΔΑ͏ʹͳΔͱάοͱϨϕϧ্͕͕Δ
Bad Code
Good Code
Bad Code
Good Code
ͦͷଞͷٕज़ • Θ͔Γ໋໊͍͢Λ৺͕͚Δ • ϚδοΫφϯόʔΛආ͚Δ • దʹίϝϯτΛೖΕΔ • কདྷඞཁʹͳΔ͔ɻɻɻͱ͍͏ίʔυೖΕͳ͍ɺඞཁʹͳͬͨΒ࣮͢Δ •
YAGNIݪଇ • ඞཁແ͘ͳͬͨίʔυ͙͢ʹফ͢ • ίʔυ͕ॏෳ͍ͯ͠ͳ͍͔Λ֬ೝ͢Δ • DRYݪଇ
2. ϨΠϠʔυΞʔΩςΫνϟͷհ
ϨΠϠʔυΞʔΩςΫνϟͱ ֤ͰΛׂɾӅṭ͢Δ ϨΠϠʔ ׂ ۩ମྫ Presentation ϢʔβʔΠϯλʔϑΣʔε HTTP ϦΫΤετͷॲཧ REST/GraphQL
Webϖʔδ Application Ϣʔεέʔεͷ࣮ υϝΠϯɾΠϯϑϥΛར༻ͨ͠ॲཧϑϩʔ Usecase Domain ϏδωεϩδοΫ γεςϜͷ֩ͱͳΔ෦ UserΫϥε ProductΫϥε Infrustructure σʔλϕʔεΞΫηε ֎෦APIݺͼग़͠ Repository Infrustructure
දతͳϨΠϠʔυΞʔΩςΫνϟ • ΫϦʔϯΞʔΩςΫνϟ • ΦχΦϯΞʔΩςΫνϟ • ϔΩαΰφϧΞʔΩςΫνϟ • ໊લ͕ҧ͏͚ͩͰతಉ͡ •
ؔ৺ͷ • ςετ͘͢͠ • υϝΠϯΛத৺ʹ • MVC (Model - View - Controller)
ॲཧͷྲྀΕ 1. Controller͕HTTPϦΫΤετΛड͚औͬͯదʹॲཧ͢Δ 2. Usecaseʹड͚औͬͨσʔλΛҾ͖͢ 3. UsecaseͰॲཧͷྲྀΕΛهड़͢Δ 1. UsecaseͰDomainϞσϧʹม͢Δ 2.
ඞཁ͕͋ΕRepositoryΛར༻ͯ͠σʔλΛऔಘ͢Δ 4. ControllerͰHTTPϨεϙϯεܕʹมͯ͠ฦ͢
3. ࣮ફྫ
ϨΠϠʔυΞʔΩςΫνϟͷ࣮ફྫ ؆୯ͳUserͷCRUDૢ࡞Λ͢ΔAPI UserͷऔಘͱొͷΈΛѻ͏
DTOͷܕఆٛ
Controllerͷॲཧ
Usecaseͷॲཧ
Domainͷॲཧ
Repositoryͷॲཧ
(༨ஊ) ࣮ྫ https://clouddirect.jp.fujitsu.com/service/navi-words-osi_reference_model
(༨ஊ) ࣮ྫ • τϥϯεϙʔτ • TCP / UDPͱ͍ͬͨϓϩτίϧΛѻ͏ • ओʹɺ௨৴ͷ৴པੑΛ্ɾ୲อ͢ΔͨΊͷ
• ωοτϫʔΫٕज़ͷҧ͍Λٵऩͯ͠ΞϓϦέʔγϣϯʹωοτϫʔΫͷ ΓޱΛݟͤͯ͋͛Δ • جຊతͳελϯεͱͯ͠ωοτϫʔΫΛ৴པ͍ͯ͠ͳ͍ • ͦͷͨΊʹɺ࠶ૹॲཧΛߦ͏
4. ίʔυ࣭ͱτϨʔυΦϑ
Α͠ɺ৽͍͠ ϓϩδΣΫτΛ্ཱͪ͛Δͧ💨
ͱΓ͋͑ͣ ϨΠϠʔυΞʔΩςΫνϟͰ࣮͢Δͧ💪
ϞϊγϦοΫͳίʔυશͯѱͩ👿
🙅
ΞʔΩςΫνϟͷબఆ ΞʔΩςΫνϟ͞·͟·ͳཁૉΛؑΈͯҙࢥܾఆΛߦ͏ https://speakerdeck.com/snoozer05/software-architecture-and-decision-making?slide=45
ΞʔΩςΫνϟͷҙࢥܾఆ ΞʔΩςΫνϟͷબఆ͞·͟·ͳཁૉΛؑΈܾͯఆ͢Δ • Ϗδωε • ͍ͭ·ͰʹϦϦʔε͍͔ͨ͠ • αʔϏεͷٻΊΔύϑΥʔϚϯεɾηΩϡϦςΟཁ݅ • ৫
• ͲΜͳεΩϧηοτͷਓ͕͍ͯɺͲΕ͘Β͍ͷਓͰ։ൃ͢Δ͔ • ٕज़ • ͲΜͳݴޠɾϑϨʔϜϫʔΫΛ༻͍ͯ։ൃΛߦ͏͔
ΞʔΩςΫνϟͷҙࢥܾఆ ΞʔΩςΫνϟͷબఆ͞·͟·ͳཁૉΛؑΈܾͯఆ͢Δ • ΞʔΩςΫνϟ͋͘·Ͱखஈ • తʹ߹ΘͤͯదͳબఆΛߦ͏͜ͱ͕ॏཁ • ͦΕͧΕͷΞʔΩςΫνϟͷϝϦοτɾσϝϦοτΛదʹཧղͯ͠ɺҙࢥܾ ఆΛߦ͏͜ͱ͕େ •
͍͘Βίʔυ͕៉ྷͰɺςετͷΧόϨοδ͕ߴͯ͘ϢʔβʔʹՁఏڙͰ ͖ͳ͚Εҙຯ͕ͳ͍
ٕज़తෛ࠴ͱͷ͖߹͍ํ ٕज़తෛ࠴ʹѱͰͳ͍ • ϏδωεϓϩδΣΫτਪਐ͢ΔͨΊͷٕज़తෛ࠴ͳΒ🙆 • Ϗδωε͕ޭ͢Εͦ͜ͰಘͨࢿۚͰෛ࠴Λฦ͍͚ͯ͠ྑ͍ • ԾʹϨΨγʔͳίʔυɺՁ؍ͷ߹Θͳ͍ίʔυͱग़ձ࣮ͬͯͨ͠ਓ ͷϦεϖΫτΛΕͳ͍ •
Some Respect For Legacy Code
5. ·ͱΊ
·ͱΊ • AI࣌ͦ͜ɺιϑτΣΞΞʔΩςΫνϟͷઃܭྗ͕ॏཁ • ྑ͍ίʔυΛॻ͘͜ͱͰอकੑΛ্͛Δ͜ͱ͕Ͱ͖Δ • ྑ͍ίʔυΛॻٕ͘ज़Λదʹ͍ͬͯ͘͜ͱ͕ॏཁ • ༷ʑͳιϑτΣΞΞʔΩςΫνϟ͕ଘࡏ͢Δ •
ͦΕͧΕͷੑ࣭ʹ߹Θͤͯదʹબɾ׆༻͢Δ͜ͱ͕ॏཁ • ίʔυ࣭ͱͦͷτϨʔυΦϑ͕ଘࡏ͢Δ͜ͱΛཧղͯ͠ӡ༻͍ͯ͘͠ඞཁ͕ ͋Δ
ࢀߟจݙ • ॻ੶ • ྑ͍ίʔυ/ѱ͍ίʔυͰֶͿઃܭೖ • Good Code, Bad Code
• ʹऩ·Δίʔυͷॻ͖ํ • Σϒϖʔδ • ͜Ε͔ΒֶͿਓͷͨΊͷιϑτΣΞΞʔΩςΫνϟೖ • Software Architecture in an AI-Driven World • ιϑτΣΞΞʔΩςΫνϟݚमʲMIXI 25৽ଔٕज़ݚमʳ
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