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CQRSͷߟ͑ํΛ
ϞόΠϧʹద༻ͯ͠ΈΔ
(ࢼߦࡨޡத)
potatotips #28
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CQRSͱʁ
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Command and Query
Responsibility Segregation
ίϚϯυΫΤϦ
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Command and Query Separation
ίϚϯυΫΤϦ
ϝιουϨϕϧͰίϚϯυͱΫΤϦΛ
͚Α͏ͱ͍͏ߟ͑
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CQRSCQSΛઃܭϨϕϧʹ
ΈࠐΜͩͷ
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Α͋͘Δͨͱ͑
Bertrand Meyerʮ͋ΒΏΔϝιουɺΞΫγϣϯ
Λ࣮ߦ͢ΔίϚϯυ͔ɺݺͼग़͠ݩʹσʔλΛฦ͢
ΫΤϦ͔ͷ͍ͣΕ͔Ͱ͋ͬͯɺ྆ํΛߦͬͯͳΒ
ͳ͍ɻ͜Εɺ࣭Λ͢Δ͜ͱͰճΛมԽͤͯ͞
ͳΒͳ͍ͱ͍͏͜ͱͩɻʯ
ఝٶʮGETϝιουͷதͰUPDATE͢ΔͳΈ͍ͨͳʯ
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CommandଆͱQueryଆʹ
͚ΔͱԿ͕͋Γ͕͍͔ͨʁ
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ҙ
ׂͱීஈޠΒΕΔCQRSEvent Sourcing͋Γ͖Ͱ
ޠΒΕ·͢
ͨͩɺEvent SourcingϞόΠϧͷઃܭʹ
߹Θͳ͍ͷͰͦΕൈ͖Ͱ͠·͢
ৄ͍࣌ؒ͠ͳ͍ͷͰɺׂѪ
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ͦͦCommandଆͱQueryଆ
ߟ͑Δ͜ͱ͕݁ߏҧ͏ɻ
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؆୯ͳFeedܥͷΞϓϦΛ࡞Ζ͏ͱͯ͠ɺ
هࣄҰཡͱ͔هࣄৄࡉαΫαΫ࡞Εͯ
ͳ͔ͳ͔៉ྷͳઃܭͩͬͨͷʹɺ
POSTͳϝιουΛݺͿػೳೖΕ్ͨɺ
શମͷઃܭ͔Β౷Ұੑ͕ফ͑ͨ͜ͱ͋Γ·ͤΜ͔ʁ
͋Δ͋Δʁ
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͡Ί͔Β
CommandଆͱQueryଆΛ͚ͯߟ͑Δͱ
ͦ͏͍͏൵͔ܶΒٹΘΕΔ
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3PVUFS
ྫ͑͜Μͳײ͡ (WIP)
Read
Command
Command
binding
%PNBJO
Observable/
Promise(DTO)
7JFX.PEFM
Feedback
6*
JOGSBTUSVDUVSF
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Commandଆ
- ඇಉظ௨৴
- υϝΠϯ
- Feedbackͷํ๏
ΒΜΛ͔ͬ͠Γߟ͑ͯΕ
ͳΜͰ͍͍ͱࢥ͏ɻ
JOGSBTUSVDUVSF
3PVUFS
Command
%PNBJO
Feedback
6*
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No content
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No content
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binding
Observable/
Promise(DTO)
7JFX.PEFM
6*
Readଆ(Ͳ͏Ͱྑ͍)
Readଆ࠷ѱɺ
Smart UI Anti Patternʹ
ͯ·ͬͯ
ͦΜͳʹมͳ͜ͱͳΒͳ͍
JOGSBTUSVDUVSF
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͜͏͢Δ͜ͱͰ݁ߏઃܭ͕εοΩϦ͢Δ
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ͨͩ͠ɺ͜͏͍͏ཁ݅ʹ߹Θͳ͍
• ΫΠζܥ
• ήʔϜܥ
Read͖ͯͨ͠ͷΛॾʑՃͨ͠Γ͢Δܥ
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binding
Observable/
Promise(DTO)
7JFX.PEFM
6*
JOGSBTUSVDUVSF
binding
7JFX.PEFM
6*
JOGSBTUSVDUVSF
%PNBJO
͜͜ʹϩδοΫΛೖΕͨΓೖΕͳ͔ͬͨΓͰΉ
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·ͱΊ
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• ReadଆɺCommandଆͰઃܭΛߟ͑ΔͱεοΩϦ͢Δ
• Readଆ͕ෳࡶͳ߹߹Θͳ͍͔͠Εͳ͍
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༡ΜͰΔͷͰ͋·ΓࢀߟʹͳΒͳ͍͔͚ͩͲɺαϯϓϧ
https://github.com/kgmyshin/esa-android
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͝ਗ਼ௌ͋Γ͕ͱ͏͍͟͝·ͨ͠