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オブジェクト指向のこころ: 第22章 / DESIGN PATTERNS EXPLAINED:...
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hideki kinjyo
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February 03, 2022
Programming
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オブジェクト指向のこころ: 第22章 / DESIGN PATTERNS EXPLAINED: chapter-22
会社で「オブジェクト指向のこころ」の読書会をやっています
hideki kinjyo
PRO
February 03, 2022
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Transcript
ୈ22ষ Object Poolύλʔϯ ՝ਤॻ: ΦϒδΣΫτࢦͷ͜͜Ζ: σβΠϯύλʔϯͱͱʹֶͿ
ᴷେ·͔ʹݴ͑ɺΦϒδΣΫτϓʔϧύλʔϯɺ͏ͷΛ ܾ·͚ͬͨͩɺݴ͍͑ΕϓʔϧΛɺ࡞Δํ๏Ͱ͢ɻ GoݴޠʹΑΔฒߦॲཧ P59-60
ͳΜͰͦΜͳࣄ͍ͨ͠ͷʁ • ΦϒδΣΫτͷੜίετ͕ߴ͘ɺ͋Μ·Γੜͨ͘͠Ͷʙͱ͍͏͕࣌͋ Δ(࡞Γஔ͖ˍ͍·Θ͍ͨ͠) • ͜ΕSingletonͱࣅͨಈػͰ͢Ͷ • ੜ͞ΕΔʹ্ݶΛઃ͚͍ͨͳʙͱ͍͏͕࣌͋Δ(ϦιʔεཧΛγϏΞ) • (ʮੜ࣌ʹϝϞϦΛXXX
KB֬อ͢ΔΑʯͬͯΦϒδΣΫτ͕ແݶʹ࡞ ΒΕͨΒࠔΔΜ͡Όɺͱ͔Ͱ) • ৽͘͠࡞Βͳ͍Ͱɺۭ͖͕ग़Δ·Ͱͬͯཉ͍͠ʂ • ओʹඇಉظॲཧΛѻ͏έʔεʹͯ༗༻
Ͳ͏Δͷʁ • PoolΫϥε(Manager)Λͭ͘Δ • Pool • ͑ΔΦϒδΣΫτ(Ϧιʔε)Λɺۭ͖ঢ়ଶ͕Θ͔Δঢ়ଶ ͰஷΊΔ • ཁٻ͞ΕͨΒۭ͍͍ͯΔΦϒδΣΫτΛฦ͢
• ͍ऴΘͬͨΒΦϒδΣΫτΛฦͯ͠Β͏ • ར༻ऀɺΦϒδΣΫτͷऔಘΛPoolܦ༝Ͱߦ͏Α͏ʹ͢Δ
Ϧιʔεͩ͘ ͍͞ʂ ͍͋Αʂ ͭऔΓग़͢ Α Ͳ͏ͧʙ ͍ऴΘͬ ͨΑʂ ͍͋Αʂ ฦ͖ͬͯͨ
Α
Ϧιʔεͩ͘ ͍͞ʂ ͳ͍ͷͩ Θʂʂ ͭऔΓग़͢ Α Ͳ͏ͧʙ ͬͯͶʂ ͬͯͶʂ ͬͯͶʂ
ͬͯͶʂ ͬͯͶʂ ͬͯͶʂ ,*5"ʂʂ ͬͯͶʂ ͍ऴΘͬ ͨΑʂ
Pool͕ͳ͍ͱͲ͏ͳΔͷʁ • ར༻ऀͷ͚ͩʮੜʯͷॲཧ͕Δʂ • ੜ1ͭ1ͭʹύϫʔ͕ཁΔ • ͦͷ͚ͩࣗଓઌͷϦιʔεΛফඅ͢Δ • ͍͡ΘΔͳ؍: ʮϦιʔεͷফඅঢ়گʯΛࢹͯ͠ɺΓ
ͳ͔ͬͨΒͲ͏͜͏͢ΔʙΛ͢ΕPool͠ͳ͍͍ͯ͘ʁ • ੜʹ͏ύϫʔมΘΒͳ͍ͷͰ͕Δ • GCΛ͍ͬͯΔͱɺʮෆඞཁʹͳͬͨ(ղ์͞Εͨ)ʯ࣌ ͰɺϦιʔε͕আ͞ΕΔ • ʮ͍ऴΘͬͯղ์͠ͳ͍ʯΑ͏ʹ͢Δ͕͍Δ ݸ্ݶͷ͋ΔϦιʔεΛ͍·Θ͠ɺۭ͖͕ͳ͚ΕͨͤΔྫ →
ຊͷʹΓ·͢
࡞ͬͯͶ˒ • ωοτϫʔΫΛ௨ͯ͡ΞϨίϨ͢ΔγεςϜ • (TCP/IPܦ༝ͰϝΠϯϑϨʔϜͱ௨৴͢Δ • ΫϥΠΞϯτ -> [ίίΛ࡞Δ] ->
ϝΠϯϑϨʔϜ • ϦΫΤετ͝ͱͷԠ͕࣌ؒ৳ͼͯɺಉ࣌ॲཧΛଟ͘ ͍ͨ͠ • : ϝΠϯϑϨʔϜͷଓΛԿݸ։͚ΔΜͩɾɾɾʁ
͜͏ͬͯ࡞Ζ͏˒ • ͱΓ͋͑ͣʮܨ͍ͰɺΓͱΓͯ͠ɺ͖ͬͯͨσʔλΛ ॲཧ͢ΔʯΈ͍ͨͳ෦Λ࡞ͬͪΌ͍͍ͨ • ΦϒδΣΫτ(ଓ)ͷ্ݶઈରʹઃ͚Δʂʂ • ʮԿݸ։͚Δ͔͔Βͳ͍ʯ͔ΒɺʮޙͰ؆୯ʹม͑ΒΕ ΔΑ͏ʹʯ͓ͯ͘͠ ➡ʮΘ͔Βͳ͍ॴΛޙճ͠ʹ͓͚ͯ͠Δ(அΛԆͤ͞Δઃ
ܭߦҝ)ʯΛ͓͚ͯ͠ɺ։ൃऀ҆৺҆શͬͯϫέʂ
ͦ͜ͰObject PoolͰ͢Α ଓΦϒδΣΫτ(Port)ͱɺ ͦΕΛཧ͢Δϓʔϧ(PortManager)Λ࡞ͨ͠ • PortManagerάϩʔόϧʹ1ݸ͚ͩଘࡏ͢Δ • Singletonͷར༻ • PortManagerɺPortͷੜɾཧΛ୲
• ੜɾฦ٫ɾ(ҟৗ࣌ͷ)ഁغͳͲ
PoolͷͱClientͷ • Clientͷؔ৺ʮ͑ΔPortΛΑͤ͜ʯͱ͍͏ • ʮੜ(factory)ʯΛPoolʹͤΔͱ͍͏͜ͱɺੜ͕ʮ ͑Δʯঢ়ଶʹ͋Δͱ͍͏͜ͱ·ͰPool͕ཧग़དྷΔͱ͍͏͜ͱ • ʮ࡞Δ͜ͱʯͰͳͯ͘ʮ४උ͠ɺఏڙ͢Δ͜ͱʯ͕ • ʮବʹͳͬͨPortೖΕସ͑Δʯͱ͔ɻ
• Clientʮ͑ΔͷΛཁٻ͠ଓ͚ͯɺࣗΒͷతΛୡ͢Δʯ ͚ͩͰΑ͍
ͱ։ൃ • ʮͷʯʮநʹΑΔઃܭʯʮΧϓηϧԽʯ͕࣮ݱ͞Ε Δ͜ͱͰɺʮ۩ମͷஅʯΛޙճ͠ʹͰ͖Δ • ௨৴࣌ΤϥʔͲ͏ѻ͓͏ɾɾʁͱ͔΄΅ؾʹͤͣɺͻͱ ·ͣʮ௨৴͕Ͱ͖ΔલఏʯͰ(Clientͷ)ϩδοΫͷ࣮ΛਐΊ ΒΕΔ • ʮ͍·ؾʹ͠ͳͯ͘ྑ͍͜ͱʯʮ۩ମʯͰ͋Δ֖વੑ͕ߴ͍ɻ
• ۩ମৄࡉͬͯ͜ͱʮมಈੑʯͰ͋Δ֖વੑ͕ߴ͍ɻ • ʮมಈੑΛΧϓηϧԽͤΑʯͱ͍͏ઃܭ