【Go言語】オプション設定のベストプラクティス

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Tomoki Ota ʲGoݴޠʳΦϓγϣϯઃఆͷϕετϓϥΫςΟε

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HTTPαʔόͷ࡞੒ 2

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HTTPαʔόͷ࡞੒ 3

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GinͷNew() 4

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ᶃγϯϓϧͳΦϓγϣϯઃఆ ᶄCon f igߏ଄ମ ᶅBuilderύλʔϯ ᶆؔ਺Φϓγϣϯύλʔϯ ᶇDysfunctional Options Pattern ᶈ݁࿦ ΞδΣϯμ

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γϯϓϧͳΦϓγϣϯઃఆํ๏

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7 γϯϓϧͳઃఆํ๏

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γϯϓϧͳઃఆํ๏ debugͷઃఆΛ௥Ճ͢Δ

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HTTPαʔόͷ࡞੒ 9 ΫϥΠΞϯτଆͰҾ਺͕଍Γͳͯ͘յΕΔ

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γϯϓϧͳઃఆํ๏

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Con f igߏ଄ମ

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Con f igߏ଄ମ

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Con f igߏ଄ମ 13

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Con f igߏ଄ମ 14

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Con f igߏ଄ମ 15

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ࢦఆ͠ͳ͔ͬͨύϥϝʔλʹ͸θϩ஋͕ೖΔ(ҙ ਤతʹ0Λ୅ೖͨ͠ͷ͔ɺະೖྗͳͷ͔ͷҧ͍͕ ෼͔Βͳ͍) Con f igߏ଄ମͷσϝϦοτ

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ࢦఆ͠ͳ͔ͬͨύϥϝʔλʹ͸θϩ஋͕ೖΔ(ҙ ਤతʹ0Λ୅ೖͨ͠ͷ͔ɺະೖྗͳͷ͔ͷҧ͍͕ ෼͔Βͳ͍) Con f igߏ଄ମͷσϝϦοτ ϙΠϯλΛ࢖͏

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Con f igߏ଄ମͷσϝϦοτ ϙΠϯλΛ࢖͏

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Con f igߏ଄ମͷσϝϦοτ σϑΥϧτ஋Λ࢖͏৔߹͸ۭΛ౉͢ඞཁ͕͋Δ

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Builderύλʔϯ

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Builderύλʔϯͱ͸ʁ GoFͷσβΠϯύλʔϯͷ̍ͭ ॊೈੑͷߴ͍ղܾࡦΛఏڙ͠ɺՄಡੑΛߴΊΔ

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Builderύλʔϯ 22

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Builderύλʔϯ 23

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Builderύλʔϯ 24

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Builderύλʔϯ GOʹ͸Javaͷ@BuilderΑ͏ͳຐ๏͸ͳ͍ GoFͷσβΠϯύλʔϯͷ̍ͭͰ͋ΔBuilderύλʔϯ Λ༻͍Δ͜ͱͰɺॊೈੑͷߴ͍ղܾࡦΛఏڙ͞ΕΔɻ Builderύλʔϯͷॻ͖ํ΋ෳ਺͋Δɻ

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Builderύλʔϯ 26

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Builderύλʔϯ

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BuilderύλʔϯͷσϝϦοτ Con f igߏ଄ମಉ༷ɺσϑΥϧτͷઃఆΛ࢖༻͍ͨ͠৔߹͸ ۭͷߏ଄ମΛ౉͢ඞཁ͕͋Γɺݟӫ͕͑ѱ͍

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ؔ਺Φϓγϣϯύλʔϯ

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Functional Optional Pattern ؔ਺Φϓγϣϯύλʔϯ͸Մม਺ݸҾ਺ʹґଘ ͢Δ ؔ਺Φϓγϣϯύλʔϯͱ͸ʁ

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ؔ਺Φϓγϣϯύλʔϯͱ͸ʁ

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ؔ਺Φϓγϣϯύλʔϯͱ͸ʁ

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ؔ਺Φϓγϣϯύλʔϯͱ͸ʁ σϑΥϧτ஋Λઃఆ͍ͨ͠৔߹͸ઃఆ͢Δඞཁ͕ͳ͍

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Dysfunctional Options Pattern

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ؔ਺Φϓγϣϯύλʔϯ͸தؒ૚͕ଟ͘ɺෳࡶͰ ͋Δͱ͍͏͜ͱΛ໰୊ࢹͨ͠ύλʔϯ Dysfunctional Options Patternͱ͸ʁ

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Dysfunctional Options Pattern

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BulderύλʔϯͷҰͭ Dysfunctional Options Patternͱ͸ʁ

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Dysfunctional Options Patternͱ͸ʁ ނʹɺσϑΥϧτ஋Λ࢖༻͍ͨ͠৔߹͸ɺۭͷߏ଄ମΛ౉͢ඞཁ͕͋Γ·͢ɻ ނʹɺσϑΥϧτ஋Λ࢖༻͍ͨ͠৔߹͸ɺۭͷߏ଄ମΛ౉͞ͳ͚Ε͹ͳΒͳ͍

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݁࿦

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GoͰҰ൪׳༻తͰ޷·ΕΔ΋ͷ͸ɺؔ਺Φϓγϣϯύλʔϯ Builderύλʔϯ͸࣮૷͠΍͍͕͢ɺσϑΥϧτ஋Λઃఆ͢Δ ͱ͖ʹɺJavaͱҧͬͯบ͕͋Δ ݁࿦

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GoͰҰ൪׳༻తͰ޷·ΕΔ΋ͷ͸ɺؔ਺Φϓγϣϯύλʔϯɻ Builderύλʔϯ͸࣮૷͠΍͍͚͢ͲɺJavaͱҧ͍ɺগ͠บ͕͋Γ· ͢ɻ ݁࿦