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Facade パターンを図で理解する
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Kota Hashihama
March 31, 2021
Programming
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Facade パターンを図で理解する
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TGIW LT at 株式会社じげん
Kota Hashihama
March 31, 2021
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Transcript
'BDBEFύλʔϯ ΛਤͰཧղ͢Δ ʙ-BSBWFMͰΘΕ͍ͯΔ(P'σβΠϯύλʔϯʙ εϐʔΧʔɿ݁ࠗ૬ஊॴൺֱωοτɹڮᖛଠ ࢀߟɿ5&$)4$03& IUUQTUFDITDPSFDPNUFDI%FTJHO1BUUFSO'BDBEFIUNM
'BDBEFͱʮݐஙͷਖ਼໘ʯ సͯ͡ ݐஙͷਖ਼໘ ૭ޱ ϑΝαʔυ
͋Δ༵ͷ͜ͱʕʕ
ࢁా͘Μ ࠛਤؑΛ आΓ͍ͨͧ ਤॻؗ
ିग़ா ॴଂຊϦετ ͜ΕΒΛͬͯ आΓ͍ͨຊΛ ୳ͯ͠Ͷ ɾɾɾʁ ʔ͍ʂʂ
ࢁా͘ΜࣗྗͰ ିग़ாͱॴଂຊϦετΛ͍͜ͳ͢ඞཁ͕͋Δ ͋ΕɺͲ͏ͬͯ͏ͷʁ ͜Εɾɾɾ
DMBTT-FOEJOH#PPL\ QVCMJDGVODUJPODIFDL CPPL@OBNF \ ିग़ாΛνΣοΫ͢Δ ିग़தͰ͋ΕUSVF ͦ͏Ͱͳ͚ΕGBMTF Λฦ͢
SFUVSOJT@MFOU ^ ^ DMBTT#PPL-JTU\ QVCMJDGVODUJPOTFBSDI#PPL CPPL@OBNF \ ຊͷ໊લ͔Β ॴͷ໊લΛฦ͢ ͳ͚ΕOVMMΛฦ͢ SFUVSOMPDBUJPO ^ ^ DMBTT7JTJUPS\ QVCMJDGVODUJPONBJO \ ຊͷ໊લ͔ΒॴΛ୳͠ आΓΔ͜ͱ͕Ͱ͖Δͷ͔Λ ·ͣௐ͍ͨ ͔͠͠ɺ-FOEJOH#PPLͱ #PPL-JTUͷ༷Ѳ͕ ࢁా͘Μʹ͘͠ɺ ࣮ࠔΛۃΊͨ ^ ^ ିग़ா ʢ-FOEJOH#PPLΫϥεʣ ॴଂຊϦετ ʢ#PPL-JTUΫϥεʣ ࢁా͘Μ ʢ7JTJUPSΫϥεʣ
ਤॻؗʹ'BDBEF ͕࣮͞ΕͯΔΑ 7JTJUPSΫϥε͕࣮Ͱ͖ͳ͔ͬͨΑʔʂ
ࢁా͘Μ ਤॻؗʹ࣮͞Ε͍ͯΔ 'BDBEFΛ ͏͜ͱʹͨ͠
ࠛਤؑͬͯ ͋Γ·͔͢ʁ ͪΐͬͱͬͯͶɺ͑ʔͬ ͱʜʢŰƅŽŰƅŽ ӈԞͷຊ୨ʹ͋ΔΑ ࢘ॻͷதଜ͞Μ ʢିग़ாͱॴଂຊϦετΛѻ͑Δਓʣ
ࠛਤؑɺ(&5ͩͥʂ
DMBTT7JTJUPS\ QVCMJDGVODUJPONBJO \ தଜ͞ΜΛݺͿ OBLBNVSBOFX-JCSBSJBO BOTXFSOBLBNVSBTFBSDI#PPL bࠛਤؑ` JG
BOTXFSbିग़தΈ͍ͨ` ccBOTXFSbॴଂͯ͠ͳ͍Α` \ FDIPb೦ɾɾɾ͔Γ·ͨ͠` ^FMTF\ FDIPbͬͨʔʂआΓ·͢` ͜͜ʹआΓΔॲཧ͕ೖΔ ^ ^ ^ ࢁా͘Μ ʢ7JTJUPSΫϥεʣ DMBTT-JCSBSJBO\ QVCMJDGVODUJPOTFBSDI#PPL CPPL@OBNF \ ຊͷॴΛಛఆ͢Δ CPPL@MJTUOFX#PPL-JTU MPDBUJPOCPPL@MJTUTFBSDI#PPL CPPL@OBNF JG MPDBUJPOOVMM \ SFUVSObॴଂͯ͠ͳ͍Α` ^FMTF\ ିग़ঢ়گΛνΣοΫ͢Δ MFOEJOH@CPPLOFX-FOEJOH#PPL JG MFOEJOH@CPPLDIFDL CPPL@OBNF \ SFUVSObିग़தΈ͍ͨ` ^FMTF\ SFUVSObӈͷຊ୨ʹ͋ΔΑ` ^ ^ ^ ^ ਤॻؗͷ'BDBEF தଜ͞Μ ʢ-JCSBSJBOΫϥεʣ 7JTJUPSΫϥε͕ ࣮Ͱ͖ͨʂ
ࠛਤؑΛ आΓ͍ͨͰ͢ ࢁా͘Μ தଜ͞Μ͚ͩΛҙࣝ͢ΕΑ͍
ਤॻؗʹ'BDBEF ͕࣮͞ΕͯΔΑ ʢ࢘ॻ͞Μʹฉ͚ ؆୯ʹआΓΒΕΔΑʣ 7JTJUPSΫϥε͕࣮Ͱ͖ͳ͔ͬͨΑʔʂ ʢࠛਤ͕ؑआΓΒΕͳ͔ͬͨΑʔʂʣ
ͭ·Γ'BDBEFͱ ෳͷΫϥεಉ࢜ͷෳࡶͳॲཧΛ୲͏૭ޱʢઐՈʣ ࠛਤؑΛ आΓ͍ͨͰ͢ʂ ʢିग़ுΛݟͯɺ ॴଂϦετΛݟΔʣ ӈԞͷຊ୨ʹ͋ΔΑ ࠛਤؑɺ ຊ୨͔Β ͖࣋ͬͯ·ͨ͠
͍ɺͲ͏ͧ ݄·Ͱʹฦͯ͠Ͷ
-BSBWFMͷϑΝαʔυ $PPLJF .BJM %# 'JMF (BUF 7JFX 7BMJEBUPS ͦΕͧΕͷॲཧͷઐՈͨͪ
ෳͷΫϥεΛͬͨઐతϩδοΫΛ ͭͷΫϥεʹଋͶ ؆୯ʹѻ͑ΔΩοτͱͯ͠ఏڙ͢Δ 'BDBEFύλʔϯʹֶͿΞʔΩςΫνϟ ͦ͏͢Δ͜ͱͰɺ ͦΕͧΕͷΫϥεͷෳࡶͳ݁ͼ͖ͭΛҙࣝ͢Δ͜ͱͳ͘ ։ൃऀߴϨΠϠʔͳϩδοΫΛ࣮͍͚ͯ͠Δ
·ͱΊ ෳͷΫϥεΛͬͨෳࡶͳॲཧ ͔ͭɺͦΕ͕සൟʹΘΕΔॲཧͳΒ ૭ޱͱͯ͠'BDBEFΛ࡞Δ͜ͱΛ ݕ౼ͯ͠ΈΑ͏