各レイヤーからのエラーについて考える

by yoshiyoshifujii

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֤ϨΠϠʔ͔Βͷ Τϥʔʹ͍ͭͯߟ͑Δ 4BU !ZPTIJZPTIJGVKJJ

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͜Μʹͪ͸ w:PTIJUBLB'VKJJ !ZPTIJZPTIJGVKJJ w4PGUXBSF&OHJOFFS w4DBMB+BWB1ZUIPO 5ZQFTDSJQU w4DBMBؔ੢4VNNJU4UB⒎

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ձ৔εϙϯαʔ΍ͬͯ·͢

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ି͠ग़͠Ͱ͖Δ෦԰ w ηϛφʔϗʔϧ ໊ w ձٞࣨ ໊͔Β໊ w ΧϑΣεϖʔε ໊ w ϏΞόογϡͳͲͷ࠙਌ձ΋։࠵ՄೳͰ͢ʂ

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ࠓ೔ͷ͓࿩ͷલఏ w3&45"1*ͷαʔόαΠυ  ը໘͸ؚΈ·ͤΜ w4DBMB w࣮ફͯ͠Έͨ݁ՌΛ੔ཧ w.BZFSຊ͸ಡΜͰ·ͤΜ

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Τϥʔͷ෼ྨ wϢʔβʔͷૢ࡞ΛىҼͱ͢ΔΤϥʔ wγεςϜͷো֐ΛىҼͱ͢ΔΤϥʔ

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Ϣʔβʔͷૢ࡞ΛىҼͱ͢Δ wܖ໿ʹҧ൓͢ΔΑ͏ͳૢ࡞ wඞਢɺ௕͞ɺܕɺॏෳͳͲ wجຊతʹ͸ը໘ଆͰ֬ೝ͢Δ wࠓճ͸ɺ"1*Λ௚઀ݺͼग़͢͜ͱΛ૝ఆ wෆਖ਼ΞΫηε

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γεςϜͷো֐ΛىҼͱ͢Δ w*0ྫ֎ w/FUXPSLɺ4ZTUFN%PXO wόά w͵ΔΆ

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)551εςʔλείʔυ wϢʔβʔͷૢ࡞൪୆ wγεςϜͷো֐൪୆

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υϝΠϯۦಈઃܭ

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-BZFSFE"SDIJUFDUVSF w6TFS*OUFSGBDF w"QQMJDBUJPO w%PNBJO w*OGSBTUSVDUVSF &WBOT &SJD%PNBJO%SJWFO%FTJHO5BDLMJOH$PNQMFYJUZJOUIF)FBSUPG4PGUXBSF ,JOEMFͷҐஔ/P 1FBSTPO&EVDBUJPO,JOEMF൛

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ࡾ૚υϝΠϯϞσϧ wϓϨθϯςʔγϣϯ૚ wΞϓϦέʔγϣϯ૚ wσʔλιʔε૚ wυϝΠϯϞσϧ ૿ాږݱ৔Ͱ໾ཱͭγεςϜઃܭͷݪଇʙมߋΛָͰ҆શʹ͢ΔΦϒδΣΫτࢦ޲ͷ࣮ફٕ๏ ,JOEMFͷҐஔ/P גࣜձٕࣾज़ධ࿦ࣾ,JOEMF൛

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ΦχΦϯΞʔΩςΫνϟ wΠϯλʔϑΣʔε wΞϓϦέʔγϣϯ wυϝΠϯ wΠϯϑϥετϥΫνϟ IUUQTTQFBLFSEFDLDPNDSPTTSPBETDBMBPOEEE TMJEF

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ΠϯϑϥετϥΫνϟ Πϯϑϥ αʔϏε υϝΠϯ ϨΠϠʔͰѻ͏Τϥʔ ΠϯλʔϑΣʔε ΞϓϦέʔγϣϯ ϑΝΫτϦ ΤϯςΟςΟ υϝΠϯ αʔϏε ϦϙδτϦ ΠϕϯτύϒϦ ογϟ ϦϙδτϦ࣮૷ Πϕϯτ ύϒϦογϟ࣮૷ +BWBϥΠϒϥϦ +%#$υϥΠό౳ ྫ֎ ϦϙδτϦ Τϥʔ ΞϓϦέʔγ ϣϯΤϥʔ υϝΠϯ Τϥʔ ࢀߟIUUQTTQFBLFSEFDLDPNDSPTTSPBETDBMBPOEEE TMJEF 5SZ\ʜ^Ͱғͬͯྫ֎Λ 5SZܕʹม׵ 5SZ

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υϝΠϯ૚

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υϝΠϯ૚ͷΤϥʔ wܖ໿ҧ൓ wඞਢ wܕνΣοΫ w௕͞ɺ୹͔͞ wॏෳ w%PNBJO&SSPSܕ

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ϦϙδτϦ͸υϝΠϯͱಉ͡ wυϝΠϯ૚ʹϦϙδτϦΛఆٛ͢Δ wυϝΠϯͷΤϥʔܕͱಉ͡ʹ͢Δ͔

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ϦϙδτϦͷ੹຿Λߟ͑Δ wυϝΠϯͷӬଓԽ w࠶ੜ੒ w*0ྫ֎ΛΑ͘ѻ͍ͦ͏

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ϦϙδτϦͰҙ֎ͱߟྀ͢΂͖͜ͱ wָ؍ഉଞ 0QUJNJTUJD-PDLJOH w/PU'PVOE 0QUJPOPS'BJMVSF w͜ΕΒΛܕͰද໌ͨ͘͠ͳΔ

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ϑΝΫτϦ͸υϝΠϯͱಉ͡ wϑΝΫτϦ͸υϝΠϯΛੜ੒͢Δ wυϝΠϯͷੜ੒࣌ʹܖ໿ҧ൓Λ֬ೝ͢ Δ wυϝΠϯͷΤϥʔͱಉ͡Ͱྑ͍

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ΠϕϯτύϒϦογϟ͸ wυϝΠϯΠϕϯτͷύϒϦογϡ wܖ໿ҧ൓ͷݕূ͸ऴΘͬͨঢ়ଶ w*0ྫ֎ͷΈΛߟྀͰྑ͍

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υϝΠϯαʔϏε͸ wυϝΠϯͷϏδωεϧʔϧΛѻ͏ wܖ໿ҧ൓Λѻ͏ wϦϙδτϦ͸ѻΘͳ͍

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υϝΠϯ૚ͷΤϥʔܕ w%PNBJO&SSPSܕ w3FQPTJUPSZ&SSPSܕ wྫ֎ TDBMBVUJM5SZ

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Πϯϑϥ ετϥΫνϟ૚

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ϦϙδτϦ࣮૷ wυϝΠϯ૚ͷఆٛʹै͏ w3%#ɺ,74ɺ"84 ,JOFTJTɺ424ɺ4 w+BWB-JCSBSZ wྫ֎ΛUSZDBUDIͯ͠$POWFSU w-JCSBSZͷґଘܕ͸ด͡ࠐΊΔ

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ΠϕϯτύϒϦογϟ࣮૷ wྫ֎Λͦͷ··ѻ͏ wಛผʹܕΛఆٛͯ͠ѻΘͳ͍

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ΠϯϑϥετϥΫνϟαʔϏε wυϝΠϯͰදݱ͢Δඞཁͷͳ͍Πϯϑϥ ૢ࡞ wϑΝΠϧΞοϓϩʔυΛςϯϙϥϦʔʹ Ұ࣌อଘ w҉߸Խ෮߸

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ΠϯϑϥετϥΫνϟ૚ͷΤϥʔܕ w3FQPTJUPSZ&SSPSܕ wྫ֎

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ΞϓϦέʔγϣϯ ૚

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ΞϓϦέʔγϣϯαʔϏε wϢʔεέʔεهड़Λॻ͘Α͏ʹ wϢʔεέʔεͱͯ͠ΤϥʔΛද໌͢Δ w%PNBJO&SSPS 3FQPTJUPSZ&SSPS ྫ֎ Λ$POWFSU

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ΞϓϦέʔγϣϯΤϥʔ wϢʔεέʔεͱͯ͠ͷ Τϥʔද໌ w/PU'PVOE w#BE3FRVFTU w4ZTUFN&SSPS

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$POWFSUΛ੔ཧ w%PNBJO&SSPS"QQMJDBUJPO&SSPS w3FQPTJUPSZ&SSPS"QQMJDBUJPO&SSPS wྫ֎"QQMJDBUJPO&SSPS

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$POWFSUΛ੔ཧ wΤϥʔܕΛද໌ͨ͜͠ͱͰ$POWFSU͕ େม wશͯ"QQMJDBUJPO&SSPSʹ͢Δ w$POWFSUΛ͏·࣮͘૷͠ͳ͍ͱਏ͍

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object ApplicationErrorConverters { implicit class DomainError2ApplicationError[E](val e: Either[DomainError, E]) extends AnyVal { def toApplicationError: Either[ApplicationError, E] = e.fold( l => Left(BadRequestError(Option(l.message))), Right(_) ) } }

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object ApplicationErrorConverters { implicit class RepositoryError2ApplicationError[E](val e: Either[RepositoryError, E]) extends AnyVal { def toApplicationError: Either[ApplicationError, E] = e.fold( { case _: RepositoryOptimisticError => Left(ConﬂictError) case _: RepositoryNotFoundError => Left(NoContentsError) case _: RepositoryAlreadyExistsError => Left(BadRequestError(Some("already_exists"))) case RepositorySystemError(t) => Left(InternalServerError(t)) }, Right(_) ) } }

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object ApplicationErrorConverters { implicit class Try2ApplicationError[E](val e: Try[E]) extends AnyVal { def toApplicationError: Either[ApplicationError, E] = e.fold( e => Left(InternalServerError(e)), Right(_) ) } }

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ΠϯλʔϑΣʔε ૚

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"QQMJDBUJPO&SSPSΛ$POWFSU w)551εςʔλεʹม׵ w/PU'PVOE w#BE3FRVFTU w*OUFSOBM4FSWFS&SSPS

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)551Ҏ֎ͷΠϯλϑΣʔε w4VCTDSJCFS w3FDJFWFS w$PNNBOE-JOF*OUFSGBDF

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4VCTDSJCFS w/PU'PVOE4LJQ w#BE3FRVFTU4LJQ w*OUFSOBM4FSWFS&SSPS3FUSZ

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ΠϯλϑΣʔεʹґଘ͢Δ wΠϯλϑΣʔε͕)551ͳΒ)551ʹ w4VC3FDJFWFSͳΒ4LJQ͔3FUSZ wӬԕʹղফ͞Εͳ͍3FUSZΛ࡞ͬͯॲ ཧΛ஗Ԇͤ͞ͳ͍Α͏൑அ͕ཁΔ

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'JO