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モジュールの深さについて / depth of module
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nakabonne
January 28, 2019
Technology
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モジュールの深さについて / depth of module
http://nakawatch.hatenablog.com/entry/module-depth
nakabonne
January 28, 2019
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Transcript
Ϟδϡʔϧͷਂ͞ʹ͍ͭͯ CAEC MeetUP #4
Me • தඌ ྋ (@nakabonne) • தԝେֶֶ෦3 • AWAϚΠΫϩαʔϏε •
Go, Envoy, etc…
My tasks https://www.redhat.com/cms/managed-files/service-mesh-1680.png
My tasks https://github.com/DataDog/dd-py-tracing-workshop
Agenda • ྑ͍Ϟδϡʔϧͱ • deep moduleͱ
ྑ͍Ϟδϡʔϧͱ
খ͍͞Ϟδϡʔϧʁ
–The Unix Philosophy “Small is beautiful”
ԿނϞδϡʔϧΛ࡞Δͷ͔
ؔ࿈ੑͷߴ͍ཁૉ͕ू·Δ →࣮ͷෳࡶ͞ΛԼ͛Δ
Open a file in Java FileInputStream fileStream = new FileInputStream(fileName);
BufferedInputStream bufferedStream = new BufferedInputStream(fileStream); ObjectInputStream objectStream = new ObjectInputStream(bufferedStream);
Open a file in Java FileInputStream fileStream = new FileInputStream(fileName);
BufferedInputStream bufferedStream = new BufferedInputStream(fileStream); ObjectInputStream objectStream = new ObjectInputStream(bufferedStream); ॳาతͳI/O
Open a file in Java FileInputStream fileStream = new FileInputStream(fileName);
BufferedInputStream bufferedStream = new BufferedInputStream(fileStream); ObjectInputStream objectStream = new ObjectInputStream(bufferedStream); όοϑΝϦϯά
Open a file in Java FileInputStream fileStream = new FileInputStream(fileName);
BufferedInputStream bufferedStream = new BufferedInputStream(fileStream); ObjectInputStream objectStream = new ObjectInputStream(bufferedStream); read/write
࣮ͷෳࡶ͕͞࿙ΕͯΔ…
• খ͍͞ͱ͍͏͜ͱɺ࣋ͬͯΔใྔ͕গͳ͍ • ࣋ͬͯΔใྔ͕গͳ͍ͱɺ࣮ͷෳࡶ͕͞࿙ Ε͍͢ • ࣮ͷෳࡶ͕͞࿙Ε͍ͯΔͱɺ࣮มߋ͕पΓ ʹӨڹΛ༩͑͘͢ͳΔ
খ͞͞Λҙࣝ͗͢͠Δ
খ͞͞Λҙࣝ͗͢͠Δ
ߴڽूʁૄ݁߹ʁ
ߴڽूʁૄ݁߹ʁ
ߴڽूʁૄ݁߹ʁ ྑ͍ΠϯλʔϑΣʔε͕ඞཁ
ྑ͍ΠϯλʔϑΣʔεͱ
Bad interface
Bad interface
Bad interface
͔͠͠ιϑτΣΞมߋ͞ΕΔ →͜ͷໃ६ͷதͰ่Εͳ͍͜ͱ͕ٻΊΒΕΔ
Good interface ෆมʢՃҎ֎ͷมߋΛڐ͞ͳ͍ʣ
And
͍͋͘͢Δ͖
–Rich Hickey “Easy is relative”
Կ͕ศར͔ϢʔβʔʹΑΔ
Use case Edge case General case
Use case Edge case General case
Ұൠతͳέʔεʹߜͬͯ ͍͢͞Λٻ͢Δ
ෳࡶԽͷཧ༝ FileInputStream fileStream = new FileInputStream(fileName); BufferedInputStream bufferedStream = new
BufferedInputStream(fileStream); ObjectInputStream objectStream = new ObjectInputStream(bufferedStream); όοϑΝϦϯά͠ͳ͍ͱ͍͏ ΤοδέʔεΛڐ༰͍ͯ͠Δ
Good module ؔ࿈ੑͷߴ͍ͨ͘͞ΜͷཁૉΛӅ࣋ͪ͠ɺ ҰൠతͳέʔεͰ͍͘͢ෆมͳΠϯλʔ ϑΣʔεʹΑͬͯڧྗͳػೳΛఏڙ͢Δ
ߟ͑Δ͜ͱଟ͗͢ʂ
ຊ
deep module
A Philosophy of Software Design • ஶऀελϯϑΥʔυେֶ John Ousterhoutڭत •
ઐࢄγεςϜOS ͳͲଟذʹΔ
deep module γϯϓϧͳΠϯλʔϑΣʔεͰ ڧྗͳػೳΛఏڙ͢Δ
deep vs shallow modules
deep vs shallow modules
ΠϯλʔϑΣʔεͷෳࡶ͞ίετͰ ػೳͷڧྗ͞རӹ
ࢹ • ػೳڧྗ͚ͩͲɺͦΕҎ্ʹΠϯλʔ ϑΣʔε͕ෳࡶʹͳͬͯͳ͍͔ʁ • ΠϯλʔϑΣʔε؆୯͚ͩͲɺػೳ ශऑͰͳ͍͔ʁ
ྫɿUnix ϑΝΠϧI/O • open() • read() • write() • close()
• lseek() ←ෆม
Χʔωϧ ϢʔβΞϓϦέʔγϣϯΛ҆ఆͯ͠ ಈ࡞ͤ͞ΔͨΊʹઃܭ͞Ε͍ͯΔ →ࢀߟʹͳΔ
·ͱΊ
·ͱΊ • ྑ͍Ϟδϡʔϧͱʮؔ࿈ੑͷߴ͍ͨ͘͞ΜͷཁૉΛӅ࣋ͪ͠ɺҰൠత ͳέʔεͰ͍͘͢ෆมͳΠϯλʔϑΣʔεʹΑͬͯڧྗͳػೳΛఏ ڙ͢Δͷʯ • ࣮ݱ͢ΔͨΊʹʮϞδϡʔϧͷਂ͞ʯΛҙࣝ͢Δ • ͋͘·ͰҰͭͷߟ͑ํͰ͋ΔͨΊɺΣϧΧϜ
͋Γ͕ͱ͏͍͟͝·ͨ͠