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実例からみる冪等性問題
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Kazushige Tominaga
July 29, 2017
Programming
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実例からみる冪等性問題
#tqrk11
Kazushige Tominaga
July 29, 2017
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Transcript
࣮ྫ͔ΒΈΔႈੑ ϑϦϚΞϓϦฤ
2 Fablic, inc. Software Engineer ӬҰ @tooooooooomy ϓϩϑΟʔϧ @kazu9su ओʹαʔόʔαΠυͷ։ൃΛ୲
6݄த०ʹδϣΠϯ
3 ϑϦϧ '3*- ʮཉ͍͠ʯ͕Έ͔ͭΔϑϦϚΞϓϦ
ႈੑͱ 4
5 ႈੑͱ ֶʹ͓͍ͯɺ ႈੑʢ͖ͱ͏͍ͤɺӳJEFNQPUFODFɹʮۊੑʯͱॻ͕͘ ಡΈํಉ͡ʣɺ େࡶʹݴͬͯɺ ͋Δૢ࡞Λճߦͬͯෳճߦͬͯ ݁Ռ͕ಉ͡Ͱ͋Δ͜ͱΛ͍͏֓೦Ͱ͋Δɻ Ҿ༻: ϑϦʔඦՊࣄయɹΟΩϖσΟΞຊޠ൛ΑΓ
6 ႈੑͱ ֶʹ͓͍ͯɺ ႈੑʢ͖ͱ͏͍ͤɺӳJEFNQPUFODFɹʮۊੑʯͱॻ͕͘ ಡΈํಉ͡ʣɺ େࡶʹݴͬͯɺ ͋Δૢ࡞Λճߦͬͯෳճߦͬͯ ݁Ռ͕ಉ͡Ͱ͋Δ͜ͱΛ͍͏֓೦Ͱ͋Δɻ Ҿ༻: ϑϦʔඦՊࣄయɹΟΩϖσΟΞຊޠ൛ΑΓ
࣮ࡍʹىͬͨ͜ 7
8 Χʔυܾࡁॲཧͷෆ۩߹ w ܾࡁͷϨίʔυ͕*%ॏෳͯ͠ొ͞Ε͍ͯΔ w ࣦഊͱޭͷ྆ํͷεςʔλεͰొ͞Ε͍ͯΔ w ͲͪΒͷϨίʔυ͕ਖ਼ͳͷ͔Θ͔Βͳ͍
9 Χʔυܾࡁॲཧͷෆ۩߹ͱ͕ͯ͠ൃݟ͞ΕΔ w ܾࡁͷϨίʔυ͕*%ॏෳͯ͠ొ͞Ε͍ͯΔ w ࣦഊͱޭͷ྆ํͷεςʔλεͰొ͞Ε͍ͯΔ w ͲͪΒͷϨίʔυ͕ਖ਼ͳͷ͔Θ͔Βͳ͍ JE TFUUMFNFOU@JE
TUBUVT GBJMVSF TVDDFTT
10 ঢ়گ͔Βਪଌ͞ΕΔڍಈ w ܾࡁॲཧϦΫΤετ͕ճ͍ͬͯΔ w ϦΫΤετͷॲཧ࣌ؒʹ͕ࠩ͋Δ w Ϩίʔυ͕ॏෳ w ҟͳΔϨεϙϯεΛฦ͍ͯ͠Δ
ਤղ 11
12 ਤղ ֎෦γεςϜ %# ճ
13 ਤղ ֎෦γεςϜ ճ %#
14 ਤղ ֎෦γεςϜ %# ճ ճ
15 ਤղ ֎෦γεςϜ ճ ճ %#
16 ਤղ ֎෦γεςϜ %# ճ ճ ࣦഊ
17 ਤղ ֎෦γεςϜ %# ճ ճ ࣦഊ ࣦഊ
ޭ
18 ਤղ ֎෦γεςϜ %# ճ ճ ޭ ࣦഊ ࣦഊ
ޭ
Λཧ 19
20 ϦΫΤετΛૹΔଆ w ಉ͡ϦΫΤετΛճૹͬͯ͠·͍ͬͯΔ ϦΫΤετΛड͚Δଆ "1*
w ಉ͡ϦΫΤετΛड͚ͨͱ͖ɺճͱճͰ݁Ռ͕ҧ͍ͬͯΔɹ
21 ϦΫΤετΛૹΔଆ w ಉ͡ϦΫΤετΛճૹͬͯ͠·͍ͬͯΔ ϦΫΤετΛड͚Δଆ "1*
w ಉ͡ϦΫΤετΛड͚ͨͱ͖ɺճͱճͰ݁Ռ͕ҧ͍ͬͯΔɹ ႈੑ͕ͳ͍
ႈੑΛ࣋ͨͤΔ 22
23 )08 w ॲཧͷঢ়ଶΛҟͳΔϓϩηεؒͰڞ༗͢Δ w ॲཧதͷ߹ॲཧΛʮ͠ͳ͍ʯ
24 ঢ়ଶ w 130$&44*/( ॲཧத w 46$$&44 ޭ
w '"*-&% ࣦഊ
ਤղ 25
26 ਤղ ֎෦γεςϜ %# ճ $BDIF 1SPDFTTJOH
27 ਤղ ֎෦γεςϜ %# ճ ճ $BDIF 1SPDFTTJOH
28 ਤղ ֎෦γεςϜ %# ճ ճ $BDIF 1SPDFTTJOH 3FUSZ
29 ਤղ ֎෦γεςϜ %# ճ ճ $BDIF 3FUSZ ޭ
1SPDFTTJOH
30 ਤղ ֎෦γεςϜ %# ճ ճ $BDIF 4VDDFTT ޭ
3FUSZ
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ޭ 3FUSZ
32 ਤղ ֎෦γεςϜ %# ճ ճ ޭ $BDIF 4VDDFTT ޭ
ޭ
None
34 ·ͱΊ w ෳճϦΫΤετ͕͘Δ͜ͱΛఆ͢Δ w ঢ়گʹԠͯ͡Ͳ͏ႈੑΛ୲อ͢Δ͔มΘΔ w ಛʹ֎෦αʔϏεͱ࿈ܞ͢Δͱ͜Ζҙ͢Δ
35 'BCMJDͰҰॹʹαʔϏεΛͭ͘Γ·ͤΜ͔ʁ
ͱ͜ΖͰ 36
37 POLDPQ
ΊͬͪΌ͍͍ɾɾɾ 38
39 GBCMJDPQ
40 GBCMJDPQ ˞ͳ͓ಈ࡞ݕূ ͞Ε͓ͯΓ·ͤΜ
͝ਗ਼ௌ͋Γ͕ͱ͏͍͟͝·ͨ͠