今あえてDRY原則に向き合う

by Shinpei Maruyama

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CZ͠Μ΃͍BLBೣܕ஝Իػ ࠓ͋͑ͯ%3:ݪଇʹ ޲͖߹͏

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BCPVUNF w ג ϝσΟϩϜ w ݈߁Λ΋ͬͱ৽͘͠ w 4DBMB w +BWB4DSJQU w 1FSM w 3VCZ

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BCPVUNF ͍Ζ͍Ζॻ͔͍͖ͤͯͨͩ·ͨ͠

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ࠓ೔ͷ࿩ w %3:ݪଇΛݟ௚ͦ͏ w ৽͍͔͠ʁ w Թނ஌৽ͱ͍͏͜ͱͰͲ͏͔ͻͱͭ

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ಋೖ

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%3:ݪଇධ൑Α͘ͳ͍ w ͋Δఔ౓ܦݧΛੵΜͩϓϩάϥϚ ʮ%3:ʹ͍͍ҹ৅ͳ͍ʯ͍͍ͬͯ ͕ͪ

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Θ͔Δ

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ຊ౰ʹ͋ͬͨා͍࿩ w ʮVQEBUFͱJOTFSUɺҾ਺͕ಉ͡ ͳͷͰಉؔ͡਺ʹ·ͱΊ·ͨ͠ʂ %3:ݪଇͰ͢ʂʯ

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ͩΜͩΜ%3:ʹ ରͯ͠υϥΠͳଶ౓ ͱΔΑ͏ʹͳΓ͕ͪ

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Ͱ΋ɺͦ΋ͦ΋ %3:ݪଇͬͯͳʹʁ

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%POU3FQFBU:PVSTFMG w ॏෳ͸Α͘ͳ͍͔Βॏෳ͸ഉআ͠Α ͏Ͷɺͱ͍͏ݪଇ w ϓϩάϥϜͷʮઃܭʯʹؔ͢Δݪଇ Ͱ͢Ͷ

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Αͦ͞͏͡ΌΜ ͱ͜ΖͰʜ

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%POU3FQFBU:PVSTFMG w ॏෳ͸Α͘ͳ͍͔Βॏෳ͸ഉআ͠Α ͏Ͷɺͱ͍͏ݪଇ w ϓϩάϥϜͷʮઃܭʯʹؔ͢Δݪଇ Ͱ͢Ͷ

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ઃܭͬͯͳΜͳͷʁ ;Θͬͱͯ͠ͳ͍ʁ

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ιϑτ΢ΣΞͷઃܭͬͯʁ w ໰୊Λ෼ׂͯ͠ɺߏ଄Խ͢Δ͜ͱʢཁ ग़యʣ

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ͳΔ΄Ͳʂ ෼ׂ͢Ε͹ ͑͑Μ΍ͳʂ

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✋

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Ͳ͏෼ׂ͢Δ͔ w ͨͱ͑͹%#Λѻ͏γεςϜʹ͍ͭͯɺ Ͳ͏͍͏໨ઢͰ෼ׂ͢Δ͔ߟ͑ͯΈΑ͏ w ςʔϒϧຖʹ෼ׂʁ w $36%Ͱ෼ׂʁ w ͋Δ͍͸ผͷࢹ఺Ͱ෼ׂʁ w ͍ΖΜͳํ๏͕ߟ͑ΒΕΔ͕ɺͲΕ͕ے͕ྑ ͍ͱݴ͑ΔʁͦΕ͸ͳͥʁ

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΍Έ͘΋ʹ෼ׂͯ͠ ΋μϝ

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ઃܭݪଇ͕༩͑ͯ͘ΕΔ΋ͷ w ےͷྑ͍෼ׂͱ͸Ͳ͏͍͏෼ׂͳͷ ͔ʁΛߟ͑ΔͨΊͷࢦ਑

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%3:ݪଇΛ࢖ͬͯ ໰୊Λ෼ׂ͢Δ ྫΛݟͯΈΔ

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ྫ w ͨͱ͑͹ඒ༰Ӄͷ༧໿؅ཧγεςϜΛ ߟ͑Δ w ελοϑͱސ٬͕͍Δ w ελοϑ΋ސ٬΋ɺͱ΋ʹࢯ໊Λ࣋ ͭ w Ͳͬͪ΋pSTU@OBNFඞਢ

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ૉ௚ʹॻ͖Լ͠

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%3:͡Όͳ͍ʂ

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%3:ݪଇʹૉ௚ʹଇΔ w 1FSTPO͍ͬͯ͏ΫϥεΛ࡞ͬͯɺ TFU@pSTU@OBNF͸ͦ͜ʹॻ͜͏ʂ w 4UBGG͸1FSTPOΛܧঝͯ͠ w $MJFOU΋1FSTPOΛܧঝ͠Α͏ʂ w ΍ͬͨͶʂ%3:ͩʂ

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%3:ݪଇ

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΍ͬͨͶʂ

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ຊ౰ʹʁ

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͋Δ೔ w ʮ͜ͷγεςϜɺෆศͳΜͰ͢Αʯ w ి࿩༧໿ͷͱ໊͖ͬͯࣈ͔͠ਜ͔ͳ ͍͜ͱ͕ଟ͍Μ͚ͩͲɺͳΜ͔Լͷ ໊લ΋ඞਢೖྗͳΜ͢ΑͶ

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͋Δ೔ w ʮελοϑ΋໊ࣈ͸ඞਢɺԼͷ໊લ ͸೚ҙͰ͍͍Ͱ͔͢ʯ w ʮ͍΍ɺͦΕ͸ࠔΔͳʙʯ

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ख͔͚ؒͣͰ͖Δमਖ਼

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͜ΕͰ͍͍ͷʁ w ਌Ϋϥεʹʮڞ௨͡Όͳ͍ॲཧʯ͕ ॻ͔ΕͯΔ w ;ͨͭͷࢠΫϥεͷಈ͖ͷҧ͍͸਌ ΫϥεΛݟʹߦ͔ͳ͍ͱΘ͔Βͳ͍ w ෼ذ͸ෳࡶͷ࢝·Γ

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͜ΕͰ͍͍ͷʁ w ΋ͬͱͪΌΜͱॻ͜͏ͱࢥͬͨΒ਌ Ϋϥεʹॻ͍ͯͨॲཧΛࢠΫϥεଆ ʹҠͯ͠ɺͦ͏͢Δͱ΋͸΍਌Ϋϥ εඞཁͳ͘ͳͬͯʜʜ w େखज़ͱͳΔ

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%3:ʹͨ݁͠Ռɺ Ή͠Ζෳࡶੑ͕ ૿ͯ͠ϝϯςφϏϦ ςΟ௿Լͨ͠ʜ

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ͳͥ͜Μͳ͜ͱʹʜ

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%3:ݪଇ l͚ͩz Λߟ͍͑ͯΔ͍ͤ

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ଞͷઃܭݪଇ΋ ݟͯΈΑ͏

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ڽू౓ͱ݁߹౓

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ڽू౓ͱ݁߹౓ w ڽू౓͸ߴ݁͘߹౓͸௿͘ w ؔ࿈ͷߴ͍΋ͷ͸ಉ͡෦඼ʹ·ͱΊΔ w ෦඼ಉ࢜ͷӨڹ͸ͳΔ΂͘খ͘͢͞Δ

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ྫ

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ڽू౓͕௿͍ྫ ؔ࿈͢Δ΋ͷΛ όϥόϥόϥͬͱ ͍ͬͯ͡͠·͍ͬͯΔ

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ڽू౓ΛߴΊΔ ؔ࿈͢Δ΋ͷ͸ ͻͱͭʹ·ͱΊΔ

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݁߹౓͕ߴ͍ྫ 4UB⒎ͱ$MJFOU ຊདྷผͷ΋ͷͳͷʹ ॲཧ͕ͻͱͭͷͱ͜Ζʹ ॻ͔Εͯ͠·͍ͬͯΔ

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݁߹౓Λ௿ΊΔ w ͋ͱͰ΍Γ·͢

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୯Ұ੹೚ݪଇ

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୯Ұ੹೚ݪଇ w ͋ΔΫϥε͕มߋ͞ΕΔཧ༝͕̎ͭ Ҏ্͋ͬͯ͸͍͚ͳ͍

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ྫ

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୯Ұ੹೚ݪଇʹ൓͢Δྫ ΫϥεΛมߋ͢Δཧ༝ɿ 4UB⒎ͷ࢓༷มߋ $MJFOUͷ࢓༷มߋ

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୯Ұ੹೚ʹ͢Δ w ͋ͱͰ΍Γ·͢

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ղ์ด࠯ݪଇ

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։์ด࠯ݪଇ w ֦ுʹରͯ͠։͍͍ͯΔ w ػೳ௥Ճ͢Δࡍʹɺ΋ͱ΋ͱͷίʔυʹӨ ڹ͕ͳ͍Α͏ʹ͠Α͏ w मਖ਼ʹରͯ͠ด͍ͯ͡Δ w ಺෦Λमਖ਼ͨ͠ͱ͖ʹͦͷΫϥεʹґଘ͠ ͯΔΫϥεʹӨڹ͕ͳ͍Α͏ʹ͠ͳ͚Ε͹ ͳΒͳ͍

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ྫ

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֦ுʹରͯ͠։͍͍ͯͳ͍ ߴ଎ҠಈϞʔυͷଞʹ΋ ΧχϞʔυ͕௥Ճ͞ΕͨΒʁ

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֦ுʹରͯ͠։͘ ΧχϞʔυ͕௥Ճ͞Εͯ΋ ଞͷΫϥεΛॻ͖׵͑Δ ඞཁͳ͠

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मਖ਼ʹରͯ͠։͍͍ͯͳ͍ ߴ଎ҠಈϞʔυΛमਖ਼͢Δͱ͖ ΧχϞʔυʹ΋ӨڹΛ ༩͔͑Ͷͳ͍

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मਖ਼ʹରͯ͠ด͡Δ ߴ଎ϞʔυΛमਖ਼ͯ͠΋ ଞͷΫϥεʹӨڹΛ༩͑ͳ͍

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Ҏ্Λҙࣝͯ͠ ໰୊Λ࠶ݕ౼͢Δ

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໰୊ͷݟ௚͠ w 4UBGG΋$MJFOU΋ͲͪΒ΋ࢯ໊Λ ࣋ͭ w ಉ͡7BMJEBUJPOͰ͋Δ w ผʑʹॻ͘ͱ%3:͡Όͳ͍ͷͰͳ Μͱ͔͍ͨ͠

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w %3:Ͱͳ͍ຊདྷͻͱͭͷΫϥ ε΍ϝιου͕୲͏΂͖੹຿͕ෳ਺ ͷͱ͜Ζʹ͹Β·͔Εͯ͠·͍ͬͯ Δ w ੹຿Λݟ௚ͯ͠ΈΔ΂͖ ໰୊఺

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୯Ұ੹೚ݪଇʢ࠶ܝʣ w ͋ΔΫϥε͕มߋ͞ΕΔཧ༝͕̎ͭ Ҏ্͋ͬͯ͸͍͚ͳ͍ w ˠʮมΘΓͦ͏ͳͱ͜Ζʯ͕Ͳ͔͜ Λ஌Γɺ͔ͦ͜Βʮ෼ׂ఺ʯΛݟग़ ͢΂͖

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Ͳ͕͜มΘΓͦ͏ʁมΘΒͳͦ͏ʁ w ސ٬ελοϑͱ͍͏΋ͷ͕ଘࡏ͢ Δ͜ͱ͸ଟ෼ͦ͏ͦ͏มΘΒͳ͍ͩ Ζ͏ w ސ٬ࣗମͷ࢓༷มߋ͸͋Γͦ͏ w ελοϑͷ࢓༷มߋ΋͋Γͦ͏

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Ͳ͕͜มΘΓͦ͏ʁมΘΒͳͦ͏ʁ w ʮۭന͔Ͳ͏͔ΛνΣοΫ͢Δʯͬ ͯඞཁੑ͸มΘΒͣ͋Γͦ͏ w ۭനͱ͸Կ͔ʁ͸มΘΔ͔΋ʢεϖʔ ε͸ʁOJM͸ʁվߦ͸ʁʣ

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Ͳ͏෼ׂ͢Δ w ސ٬ w ސ٬ͷ࢓༷มߋʹΑͬͯมΘΔ w ελοϑ w ελοϑͷ࢓༷มߋʹΑͬͯมΘΔ w ۭനνΣοΫ܅ w ۭനͱ͸Կ͔ɺͱ͍͏࢓༷ʹΑͬͯมΘΔ

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΍ͬͯΈͨ

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Ұ౓Ҿ͍ͯ ઃܭݪଇΛຬͨͯ͠ ͍Δ͔ݟͯΈΔ

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݁߹౓ڽू౓ w ڞ௨ͷ਌Ϋϥε͕ͳ͘ͳͬͯ$MJFOU ͱ4UBGGͷ݁߹౓͕௿͘ͳͬͨ w ۭനνΣοΫॲཧࣗମ͸ۭനνΣο Ϋ܅ʹ੾Γग़͞Ε͓ͯΓɺڽू౓͕ ߴ·ͬͨ

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୯Ұ੹೚ݪଇ w $MJFOU͕มߋ͞ΕΔཧ༝͸$MJFOUͷ࢓༷͕ มΘͬͨͱ͖ w 4UBGG͕มߋ͞ΕΔཧ༝͸4UBGGͷ࢓༷͕ มΘͬͨͱ͖ w &NQUZ7BMJEBUPS͕มߋ͞ΕΔཧ༝͸ ʮ&NQUZͷఆٛʯ͕มΘͬͨͱ͖ OJM΋ &NQUZͱΈͳ͢ͱ͔ʣ

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։์ด࠯ݪଇ w ͦΕͧΕ͕मਖ਼͞Εͯ΋ͦΕͧΕʹ ରͯ͠ӨڹΛ༩͑ͳ͍ʢमਖ਼ʹରͯ͠ ด͍ͯ͡Δʣ w ৽͍͠WBMJEBUPSΛఆٛͯ͠΋ͦΕ ͧΕʹӨڹΛ༩͑ͳ͍ʢ֦ுʹର͠ ͯ։͍͍ͯΔʣ

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͋Δ೔ w ʮ͜ͷγεςϜɺෆศͳΜͰ͢Αʯ w Ծ༧໿ͷͱ໊͖ͬͯࣈ͔͠ਜ͔ͳ͍ ͜ͱ͕ଟ͍Μ͚ͩͲɺͳΜ͔Լͷ໊ લ΋ඞਢೖྗͳΜ͢ΑͶ

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͋Δ೔ w ʮελοϑ΋໊ࣈ͸ඞਢɺԼͷ໊લ ͸೚ҙͰ͍͍Ͱ͔͢ʯ w ʮ͍΍ɺͦΕ͸ࠔΔͳʙʯ

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मਖ਼ͨ͠

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͋Δ೔ w ϑΥʔϜ͔Β͸͍͍Μ͚ͩͲɺ"1* ͔Βୟ͍ͨΒͳΜ͔Τϥʔग़ͯΔΜ ͚ͩͲ w ˠௐ΂ͨΒɺpSTU@OBNFʹۭจࣈ ྻ͡Όͳͯ͘OJM͕౉͖ͬͯ͏Δ͜ͱ ͕Θ͔ͬͨ

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मਖ਼ͨ͠

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΄͔ͷ ઃܭݪଇ΋ߟ͑ͯ ॻ͍ͨΒ อकੑ͕ߴ·ͬͨʂ

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w ·ͩͪΐͬͱ%3:͡Όͳ͍ʁ w 3VCZͷϝλϓϩʙΈ͍ͨͳ΍ͭͰͳΜ ͱ͔Ͱ͖ͦ͏ w ͦͷࡍ͸ʮଞͷઃܭݪଇΛഁΒͳ͍ʯ͜ ͱʹؾΛ͚ͭͳ͕Β΍Γ·͠ΐ͏ ·ͱΊͱ༨ஊ

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·ͱΊͱ༨ஊ w %3:͸ѱ͍΍ͭ͡Όͳ͍ɻ%3:ʮ͚ͩʯ͠ ͔ߟ͑ͳ͍ͷ͕ѱ͍ w ੹຿Λద੾ʹ෼ׂ͢ΔͨΊʹ͸ɺʮͲ͕͜ม ΘΓͦ͏ͰͲ͕͜มΘΒͳͦ͏͔ʯΛ஌Δ͜ ͱ͕େࣄ w ͦΕ͕Θ͔Βͳ͍͏͔ͪΒա৒ʹઃܭ͢Δͷ ͸ѱख

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w ܧঝΑΓҠৡΛ࢖͑ͬͯ࿩ʁʮͳ ͥʯʮͲ͏͍͏ͱ͖ʹʯͦ͏͢΂͖͔ ͱ͍͏࿩Ͱ͢ w ʮͳΜͱͳ͘ηϯεͰ΍͍ͬͯͯͭ΋ ࠔͬͯͳ͍͚ͲʯͦΕ͕Ͱ͖Δͻ ͱ͸͜Μͳൃදແࢹͯ͠େৎ෉ʂ ·ͱΊͱ༨ஊ

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࠷ޙએ఻ w Ұॹʹಇ͍ͯ͘ΕΔͻͱΛืूͯ͠· ͢ w ࣗຫͰ͖ΔϓϩάϥϚͱҰॹʹಇ͍ ͯ·͢ w ·ͩ·͍ͩΖ͍Ζ໰୊͕͋Δ͚ͲҰ ॹʹઓͬͯ͘ΕΔͻͱ୳ͯ͠·͢