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Ϟδϡʔϧͷਂ͞ʹ͍ͭͯ CAEC MeetUP #4

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Me • தඌ ྋ (@nakabonne) • தԝେֶ঎ֶ෦3೥ • AWAϚΠΫϩαʔϏε • Go, Envoy, etc…

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My tasks https://www.redhat.com/cms/managed-files/service-mesh-1680.png

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My tasks https://github.com/DataDog/dd-py-tracing-workshop

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Agenda • ྑ͍Ϟδϡʔϧͱ͸ • deep moduleͱ͸

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ྑ͍Ϟδϡʔϧͱ͸

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খ͍͞Ϟδϡʔϧʁ

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–The Unix Philosophy “Small is beautiful”

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ԿނϞδϡʔϧΛ࡞Δͷ͔

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ؔ࿈ੑͷߴ͍ཁૉ͕ू·Δ →࣮૷ͷෳࡶ͞ΛԼ͛Δ

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Open a file in Java FileInputStream fileStream = new FileInputStream(fileName); BufferedInputStream bufferedStream = new BufferedInputStream(fileStream); ObjectInputStream objectStream = new ObjectInputStream(bufferedStream);

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Open a file in Java FileInputStream fileStream = new FileInputStream(fileName); BufferedInputStream bufferedStream = new BufferedInputStream(fileStream); ObjectInputStream objectStream = new ObjectInputStream(bufferedStream); ॳาతͳI/O

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Open a file in Java FileInputStream fileStream = new FileInputStream(fileName); BufferedInputStream bufferedStream = new BufferedInputStream(fileStream); ObjectInputStream objectStream = new ObjectInputStream(bufferedStream); όοϑΝϦϯά

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Open a file in Java FileInputStream fileStream = new FileInputStream(fileName); BufferedInputStream bufferedStream = new BufferedInputStream(fileStream); ObjectInputStream objectStream = new ObjectInputStream(bufferedStream); read/write

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࣮૷ͷෳࡶ͕͞࿙ΕͯΔ…

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• খ͍͞ͱ͍͏͜ͱ͸ɺ࣋ͬͯΔ৘ใྔ͕গͳ͍ • ࣋ͬͯΔ৘ใྔ͕গͳ͍ͱɺ࣮૷ͷෳࡶ͕͞࿙ Ε΍͍͢ • ࣮૷ͷෳࡶ͕͞࿙Ε͍ͯΔͱɺ࣮૷มߋ͕पΓ ʹӨڹΛ༩͑΍͘͢ͳΔ

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খ͞͞Λҙࣝ͗͢͠Δ

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খ͞͞Λҙࣝ͗͢͠Δ

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ߴڽूʁૄ݁߹ʁ

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ߴڽूʁૄ݁߹ʁ

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ߴڽूʁૄ݁߹ʁ ྑ͍ΠϯλʔϑΣʔε͕ඞཁ

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ྑ͍ΠϯλʔϑΣʔεͱ͸

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Bad interface

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Bad interface

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Bad interface

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͔͠͠ιϑτ΢ΣΞ͸มߋ͞ΕΔ →͜ͷໃ६ͷதͰ΋่Εͳ͍͜ͱ͕ٻΊΒΕΔ

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Good interface ෆมʢ௥ՃҎ֎ͷมߋΛڐ͞ͳ͍ʣ

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And

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࢖͍΍͋͘͢Δ΂͖

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–Rich Hickey “Easy is relative”

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Կ͕ศར͔͸ϢʔβʔʹΑΔ

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Use case Edge case General case

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Use case Edge case General case

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Ұൠతͳέʔεʹߜͬͯ ࢖͍΍͢͞Λ௥ٻ͢Δ

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ෳࡶԽͷཧ༝ FileInputStream fileStream = new FileInputStream(fileName); BufferedInputStream bufferedStream = new BufferedInputStream(fileStream); ObjectInputStream objectStream = new ObjectInputStream(bufferedStream); όοϑΝϦϯά͠ͳ͍ͱ͍͏ ΤοδέʔεΛڐ༰͍ͯ͠Δ

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Good module ؔ࿈ੑͷߴ͍ͨ͘͞ΜͷཁૉΛӅ࣋ͪ͠ɺ ҰൠతͳέʔεͰ࢖͍΍͘͢ෆมͳΠϯλʔ ϑΣʔεʹΑͬͯڧྗͳػೳΛఏڙ͢Δ

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ߟ͑Δ͜ͱଟ͗͢ʂ

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ຊ୊

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deep module

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A Philosophy of Software Design • ஶऀ͸ελϯϑΥʔυେֶ John Ousterhoutڭत • ઐ໳͸෼ࢄγεςϜ΍OS ͳͲଟذʹ౉Δ

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deep module γϯϓϧͳΠϯλʔϑΣʔεͰ ڧྗͳػೳΛఏڙ͢Δ

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deep vs shallow modules

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deep vs shallow modules

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ΠϯλʔϑΣʔεͷෳࡶ͞͸ίετͰ ػೳͷڧྗ͞͸རӹ

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ࢹ఺ • ػೳ͸ڧྗ͚ͩͲɺͦΕҎ্ʹΠϯλʔ ϑΣʔε͕ෳࡶʹͳͬͯͳ͍͔ʁ • ΠϯλʔϑΣʔε͸؆୯͚ͩͲɺػೳ ͸ශऑͰ͸ͳ͍͔ʁ

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ྫɿUnix ϑΝΠϧI/O • open() • read() • write() • close() • lseek() ←ෆม

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Χʔωϧ ϢʔβΞϓϦέʔγϣϯΛ҆ఆͯ͠ ಈ࡞ͤ͞ΔͨΊʹઃܭ͞Ε͍ͯΔ →ࢀߟʹͳΔ

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·ͱΊ

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·ͱΊ • ྑ͍Ϟδϡʔϧͱ͸ʮؔ࿈ੑͷߴ͍ͨ͘͞ΜͷཁૉΛӅ࣋ͪ͠ɺҰൠత ͳέʔεͰ࢖͍΍͘͢ෆมͳΠϯλʔϑΣʔεʹΑͬͯڧྗͳػೳΛఏ ڙ͢Δ΋ͷʯ • ࣮ݱ͢ΔͨΊʹʮϞδϡʔϧͷਂ͞ʯΛҙࣝ͢Δ • ͋͘·ͰҰͭͷߟ͑ํͰ͋ΔͨΊɺ൓࿦΢ΣϧΧϜ

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͋Γ͕ͱ͏͍͟͝·ͨ͠