Clean Architecture 2

ΫϦʔϯΞʔΩςΫνϟ ࣮ફͷࣄ࢝Ί ٕज़ษڧձ

ಡॻձͷ͓஌Βͤ

୊ࡐ ϩόʔτɾ$Ϛʔνϯ  ʰ$MFBO"SDIJUFDUVSFɹ ୡਓʹֶͿιϑτ΢ΣΞ ͷߏ଄ͱઃܭʱ  ʢ֯੐యɾߴ໦ਖ਼߂༁ʣ

w ΫϦʔϯΞʔΩςΫνϟࣄ࢝Ί લճ w ΫϦʔϯΞʔΩςΫνϟ࣮ફࣄ࢝Ί ࠓճ w ΫϦʔϯΞʔΩςΫνϟ࣮ફ
࣍ճ w ΫϦʔϯΞʔΩςΫνϟ࣮ફ ࣍ʑճ w ΫϦʔϯΞʔΩςΫνϟ࣮ફ ࣍ʑʑճ w ΫϦʔϯΞʔΩςΫνϟ࣮ફ ࣍ʑʑʑճ w ΫϦʔϯΞʔΩςΫνϟ࣮ફ ࣍ʑʑʑʑճ w ΫϦʔϯΞʔΩςΫνϟ࣮ફO ࣍ʑ\ O ^ճ

w ΫϦʔϯΞʔΩςΫνϟࣄ࢝Ί લճ w ΫϦʔϯΞʔΩςΫνϟ࣮ફࣄ࢝Ί ࠓճ w ΫϦʔϯΞʔΩςΫνϟ࣮ફ
࣍ճ

w ΫϦʔϯΞʔΩςΫνϟࣄ࢝Ί લճ w ίʔυ͕ొ৔͠ͳ͍ཧ࿦తͳ࿩୊ w ΫϦʔϯΞʔΩςΫνϟ࣮ફ ࣍ճ
w $PDPB 5PVDI ͷجຊతͳύλʔϯ .7$ Λ࢖࣮ͬͨ૷ํ๏ w ΫϦʔϯΞʔΩςΫνϟ࣮ફࣄ࢝Ί ࠓճ w ؆୯ͳྫ΍ίʔυ͕ొ৔͢Δલճͷ࿩୊Λਂ۷Γ

w ΫϦʔϯΞʔΩςΫνϟࣄ࢝Ί લճ w ίʔυ͕ొ৔͠ͳ͍ཧ࿦తͳ࿩୊ w ΫϦʔϯΞʔΩςΫνϟ࣮ફ ࣍ճ
w $PDPB 5PVDI ͷجຊతͳύλʔϯ .7$ Λ࢖࣮ͬͨ૷ํ๏ w ίʔυϨϏϡʔձ w 4USJDUMZ PSUSJDLZ $MFBO"SDIJUFDUVSF w 7*1&3 ؒʹ߹͑͹ʜ w ΫϦʔϯΞʔΩςΫνϟ࣮ફࣄ࢝Ί ࠓճ w ؆୯ͳྫ΍ίʔυ͕ొ৔͢Δલճͷ࿩୊Λਂ۷Γ

લճͷ࿩୊ w ΫϦʔϯΞʔΩςΫνϟͷ؊ w #VTJOFTT3VMFT w &OUJUZ $SJUJDBM
w 6TF$BTF "QQMJDBUJPOTQFDJpD w ґଘΛҰํ޲ʹอͭ

ࠓճͷ࿩୊ w &OUJUZ $SJUJDBM w 6TF$BTF "QQMJDBUJPOTQFDJpD w
ࣸਅͷ&YJG΍.FUBEBUBΛѻ͏ΞϓϦ w -FWFM ϨΠϠʔ ؒͷσʔλͷड͚౉͠ํ๏

໨ඪ ୲౰Ҋ݅ͷ &OUJUZͱ6TF$BTF Λ۠ผͰ͖Δؾ͕͢Δ

γφϦΦ w ࣸਅͷϝλσʔλΛ͚ͩͻͨ͢Βྻڍ͢ΔΞϓϦͷ࡞੒ ґཔ w ࣸਅͷฒͼ͸ॱෆಉͰߏΘͳ͍ w ίʔυྫͷෳࡶ͞Λͳͨ͘͢Ίʹ ࣸਅࣗମ͸දࣔ͠ͳ͍

<&OUJUZ> .FUBEBUB <6TF$BTF> .FUBEBUB-JTU 6TF$BTF <*OQVU> .FUBEBUB-JTU *OUFSBDUPS <0VUQVU> .FUBEBUB-JTU
0VUQVU <%BUB4USVDU> #SPXTJOH .FUBEBUB 6*

&OUJUZ struct Metadata: Comparable { enum FlashMode { case none,
normal, redEye } init(properties: [CFString : Any]) var localIdentifier: String { get } var iso: Float { get } var focalLength: Float { get } var exposureValue: Float { get } var lensAperture: Float { get } var exposureDuration: CMTime { get } var flashMode: FlashMode { get } ŋ ŋ ŋ }

6TF$BTF *' public protocol MetadataListInteractor { func browseMetadata() } public
protocol MetadataListOutput : AnyObject { func didProvideMetadataToBrowse(_: [BrowsingMetadata]) } • MetadataListInteractor w "EBQUFS૚ͷ$POUSPMMFS͔Βར༻ • MetadataListOutput w "EBQUFS૚ͷ1SFTFOUFSͰ࣮૷ w 6TF$BTF *OUFSBDUPSͷ࣮૷ ͔Βར༻

6TF$BTF *NQ struct MetadataListUseCase: MetadataListInteractor { private let output: MetadataListOutput
func browseMetadata() { let metadata = repository.fetchMetadata() let metadataToBrowse = metadata.map(BrowsingMetadata.init(_:)) output.didProvideMetadataToBrowse(metadataToBrowse) } }

%BUB4USVDUVSF public struct BrowsingMetadata { public var localIdentifier: String {
get } public var iso: Float { get } public var focalLength: Float? { get } public var exposureValue: Float { get } public var lensAperture: Float? { get } public var exposureDuration: CMTime { get } } extension BrowsingMetadata { private init(_ metadata: Metadata) }

%BUB4USVDUVSF extension BrowsingMetadata { private init(_ metadata: Metadata) } w
ϨϕϧؒΛ·͙ͨσʔλߏ଄ମͷड౉͠ w ԼҐϨϕϧ 6TF$BTF ্͕ҐϨϕϧͷ&OUJUZΛม׵ w .FNCFSXJTFJOJUJBMJ[FS *OUFSOBM w ςετίʔυͷͨΊʹ࢒͓ͯ͘͠ w !UFTUBCMFJNQPSUͰར༻

<&OUJUZ> .FUBEBUB <6TF$BTF> .FUBEBUB-JTU 6TF$BTF <*OQVU> .FUBEBUB-JTU *OUFSBDUPS <0VUQVU> .FUBEBUB-JTU

γφϦΦ w ΍ͬͺΓιʔτػೳͷ௥Ճґཔ w ࢦఆ͞ΕͨϝλσʔλͰฒͼସ͑ w ॳظදࣔ͸γφϦΦͷॱෆಉͰͷฒͼʹͳΔ

<&OUJUZ> .FUBEBUB <6TF$BTF> 0SEFSFE-JTU 6TF$BTF <*OQVU> 0SEFSFE-JTU *OUFSBDUPS <0VUQVU> 0SEFSFE-JTU
0VUQVU <%BUB4USVDU> #SPXTJOH .FUBEBUB 6* .FUBEBUB-JTU 6$ *0

มߋͳ͠ w ػೳͷมߋͰ͸ͳ͘ɺૢ࡞ํ๏ͷมߋ w ૢ࡞ํ๏ͷมߋͷӨڹ͸6TF$BTF΄Ͳड͚ʹ͍͘ &OUJUZ

6TF$BTF ௥Ճ public protocol OrderedMetadataListInteractor { func browseSortKeys() func browseOrderedMetadata(by
key: MetadataListSortKey) } public protocol OrderedMetadataListOutput : AnyObject { func didProvideSortKeys(_: [MetadataListSortKey]) func didProvideSortedMetadataToBrowse(_: [BrowsingMetadata]) } public enum MetadataListSortKey { case iso, focalLength, exposureValue case lensAperture, exposureDuration } internal extension MetadataListSortKey : CaseIterable { }

6TF$BTF ௥Ճ internal extension MetadataListSortKey : CaseIterable { } public
protocol OrderedMetadataListInteractor { func browseSortKeys() } public protocol OrderedMetadataListOutput : AnyObject { func didProvideSortKeys(_: [MetadataListSortKey]) }

6TF$BTF ௥Ճ public enum MetadataListSortKey { case iso, focalLength, exposureValue
case lensAperture, exposureDuration } public protocol OrderedMetadataListInteractor { func browseOrderedMetadata(by key: MetadataListSortKey) } public protocol OrderedMetadataListOutput : AnyObject { func didProvideSortedMetadataToBrowse(_: [BrowsingMetadata]) }

"EBQUFSͰ͸ • MetadataListInteractor ͱ OrderedMetadataListInteractor w ಉҰͷ$POUSPMMFS͔Βར༻ w $POUSPMMFS͕ͭͷ*OUFSBDUPSΛ࣋ͬͨঢ়ଶ •
MetadataListOutput ͱ OrderedMetadataListOutput w ಉҰͷ1SFTFOUFSͰ࣮૷ w 1SFTFOUFS͕ͭͷ0VUQVUʹ४ڌͨ͠ঢ়ଶ

"EBQUFSͰ͸ w $POUSPMMFS͕ͭͷ*OUFSBDUPSΛ࣋ͬͨঢ়ଶ w 1SFTFOUFS͕ͭͷ0VUQVUʹ४ڌͨ͠ঢ়ଶ w 6TF$BTF಺Ͱ΋มߋස౓͕ҟͳΔ΋ͷ͸෼཭ w ࠓճͷྫͰ͸ඍົ͔΋

0VUQVU <%BUB4USVDU> #SPXTJOH .FUBEBUB 6* .FUBEBUB-JTU 6$ *0

γφϦΦ w ϝλσʔλΛվ͟ΜͰ͖Δػೳͷ௥Ճґཔ w ಛఆͷϝλσʔλ͚͕ͩฤूՄೳ w ݩͷࣸਅͱஔ͖׵͑ͯอଘ

<&OUJUZ> .FUBEBUB <6TF$BTF> .PEJpDBUJPO 6TF$BTF <*OQVU> .PEJpDBUJPO *OUFSBDUPS <0VUQVU> .PEJpDBUJPO
0VUQVU <%BUB4USVDU> .PEJGZJOH .FUBEBUB 6* .FUBEBUB-JTU 6$ *0 0SEFSFE-JTU 6$ *0

0VUQVU <%BUB4USVDU> .PEJGZJOH .FUBEBUB 6*

&OUJUZ extension Metadata { func validate() -> Bool } w
ػೳͷ௥Ճ͸ɺ&OUJUZʹ΋Өڹ͕ͰΔ w ػೳͷมߋ΋ಉ༷

6TF$BTF *' public struct ModifyingMetadata { public var localIdentifier: String
{ get } public var exposureValue: Float { get set } public var exposureDuration: CMTime { get set } } extension ModifyingMetadata { internal init(_ source: Metadata) } public protocol MetadataModificationInteractor { func requestToModifyMetadata(ofIdentifier localID: String) func modify(with modifyingMetadata: ModifyingMetadata) } public protocol MetadataModificationOutput : AnyObject { func didProvideMetadataToModify(_: inout ModifyingMetadata) func didModifyMetadata(_: ModifyingMetadata) func didFailToModifyMetadata(_: ModifyingMetadata) }

6TF$BTF *NQ struct MetadataModificationUseCase: MetadataModificationInteractor { private let output: MetadataModificationOutput
func requestToModifyMetadata(ofIdentifier localID: String) { let source = repository.fetchMetadata( ofIdentifier: localID ) var metadataToModify = ModifyingMetadata(source) output.didProvideMetadataToModify(&metadataToModify) } }

6TF$BTF *NQ struct MetadataModificationUseCase: MetadataModificationInteractor { func modify(with modifyingMetadata: ModifyingMetadata)
{ let source = repository.fetchMetadata( ofIdentifier: modifyingMetadata.localIdentifier ) source.exposureValue = modifyingMetadata.exposureValue source.exposureDuration = modifyingMetadata.exposureDuration guard source.valiate() else { output.didFailToModifyMetadata(modifyingMetadata) return } repository.updatePhoto(with: source) output.didModifyMetadata(modifyingMetadata) } }

%BUB4USVDUVSF public struct ModifyingMetadata { public var localIdentifier: String {
get } public var exposureValue: Float { get set } public var exposureDuration: CMTime { get set } }

%BUB4USVDUVSF w 6TF$BTF಺Ͱ΋มߋස౓͕ҟͳΔ΋ͷ͸෼཭ w ͦͷ෼཭ʹଇͬͯσʔλߏ଄ମ΋෼཭ w ઈରͰ͸ͳ͍ɻ΍Γ͗͢஫ҙ w ͲΜͳʹ෼཭ͯ͠΋  6TF$BTFಉ࢜ͷׯব͕ආ͚ΒΕͳ͍৔߹΋͋Δ
w σʔλߏ଄ମΛڞ༗͍ͯ͠Δ6TF$BTF΋ҶͮΔࣜʹมߋ

0VUQVU <%BUB4USVDU> .PEJGZJOH .FUBEBUB 6* .FUBEBUB-JTU 6$ *0 0SEFSFE-JTU 6$ *0

γφϦΦͷ·ͱΊ w ૢ࡞खॱͷ௥Ճɾมߋ͸ɺ6TF$BTFͷ௥ՃɾมߋͰରԠ w ػೳͷ௥Ճɾมߋ͸ɺ&OUJUZͱ6TF$BTFͷ௥ՃɾมߋͰରԠ w ʮͱΓ͋͑ͣ࡞ͬͯɺ͋ͱ͔ΒΞοϓσʔτʯʹϚον㾗 w ϨϕϧؒͰड͚౉͞ΕΔσʔλߏ଄ମ͸ɺ4XJGUͷTUSVDU͕ศར

ͦͷଞͷ &OUJUZͱ6TF$BTF

"MFSU$POUSPMMFS J04 w 1SFTFOUFSͰ"MFSU$POUSPMMFSΛੜ੒͢Δ৔߹ w 7JFXͰ"MFSU$POUSPMMFSΛੜ੒ɾදࣔ͢Δ৔߹

"MFSU$POUSPMMFS J04 w 1SFTFOUFSͰ"MFSU$POUSPMMFSΛੜ੒͢Δ৔߹ protocol UserInformationUpdateOutput: AnyObject { func didFailToUpdateUserInformation(
with error: Error, retrying: @escaping (Bool) -> Void ) } final class UserInformationPresenter: UserInformationUpdateOutput { func didFailToUpdateUserInformation( with error: Error, retrying: @escaping (Bool) -> Void) { let alert = // ... let retryAction = UIAlertAction(title: "Retry", style: .default) { _ in retrying(true) } alert.addAction(retryAction) let cancelAction = UIAlertAction(title: "Close", style: .cancel) { _ in retrying(false) } alert.addAction(cancelAction) view.show(alert) } }

"MFSU$POUSPMMFS J04 w 1SFTFOUFSͰ"MFSU$POUSPMMFSΛੜ੒͢Δ৔߹ final class UserInformationUpdateUseCase: UserInfoUpdateInteractor { let
output: UserInformationUpdateOutput func update(_ user: UserInformationUpdateOutput) { // ... let error = // ... output.didFailToUpdateUserInformation(with: error) { [weak self] isRetried in if isRetried { self?.update(user) } } } }

"MFSU$POUSPMMFS J04 w 7JFXͰ"MFSU$POUSPMMFSΛੜ੒ɾදࣔ͢Δ৔߹ final class UserInformationPresenter: UserInfoUpdateOutput { let
view: UserInformationView func didFailToUpdateUserInformation(with error: Error) { view.showError(withMessage: error.localizedDescription) } } final class UserInformationVC: UIVC, UserInfoView { func showError(withMessage message: String) { let alert = // ... let retry = UIAlertAction(title: "Retry", style: .default) { _ in controller.retry() } alert.addAction(retry) // ... present(alert, animated: true) } }

"MFSU$POUSPMMFS J04 w 7JFXͰ"MFSU$POUSPMMFSΛੜ੒ɾදࣔ͢Δ৔߹ final class UserInformationUpdateUseCase: UserInfoUpdateInteractor { let
output: UserInformationUpdateOutput func update(_ user: UserInformationUpdateOutput) { // ... let error = // ... output.didFailToUpdateUserInformation(with: error) } }

"MFSU$POUSPMMFS J04 w 1SFTFOUFSͰ"MFSU$POUSPMMFSΛੜ੒͢Δ৔߹ w 7JFXͰ"MFSU$POUSPMMFSΛੜ੒ɾදࣔ͢Δ৔߹ w 6TF$BTF͕6*૚ͷӨڹΛड͚ͯ͠·͍ͬͯΔ w ํ਑ΛܾΊͯͲͷํ๏Ͱ࣮ݱ͢Δ͔Λ౷Ұ
w ଥڠϙΠϯτ

όϦσʔγϣϯ w &OUJUZͱ6TF$BTFͷͲͪΒͰόϦσʔτΛ͢΂͖͔ ˠͲͪΒ΋ߦ͏Մೳੑ͕͋Δ  ྫɿೖྗϑΥʔϜ͔Βͷೖྗ஋Ͱϝλσʔλͷ஋Λߋ৽

όϦσʔγϣϯ w ਺஋Λظ଴͢ΔϑΥʔϜͷೖྗ஋ 4USJOH ͷݕূ ˠ6TF$BTF͕୲౰͢Δ w &OUJUZΑΓ΋ೖྗʹ͍ۙ ԼҐϨϕϧ
w ͲΜͳૢ࡞ํ๏Ͱೖྗ͞ΕΔͷ͔͸γεςϜͷཁ݅

όϦσʔγϣϯ w ೖྗ஋ ਺஋ ͰϝλσʔλΛߋ৽͢Δࡍͷଥ౰ੑ ˠ&OUJUZ͕୲౰͢Δ w ϝλσʔλͷ஋ͷ༗ޮൣғ͸γεςϜ͔Βಠཱͨ͠ఆٛ w &OUJUZ͸ࣗ਎ͷ੔߹ੑΛ୲อ
%%%తͳࢹ఺

l-FWFMzͰ͓͞Β͍ w Ϣʔβʔ΍γεςϜͷೖྗͱग़ྗ͔Β཭Ε͍ͯΔ΄Ͳ  Ϩϕϧ͕ߴ͍ w όϦσʔγϣϯͷྫ w Ϩϕϧ͕ҟͳΕ͹มߋස౓ɾཧ༝΋ҟͳΔ w ϝλσʔλӾཡɾฤूͷྫ 
w ΑΓ-FWFM͕ߴ͍΄͏Λ&OUJUZʹ෼཭

*0ͷڑ཭ͱϨϕϧ ೖग़ྗͷڑ཭ͰϨϕϧΛ෼͚Δཧ༝ w ೖग़ྗͷํ๏͸6*ͷઃܭ΍ɺࣄۀઓུͳͲͷཧ༝͞ΕΔ w ೖग़ྗ͸ɺ֎తͳཁҼͷӨڹΛड͚΍͍͢  ˠߋ৽ස౓͕ߴ͍ w ೖग़ྗͷ͔Βڑ཭ΛऔΓɺ֎తཁҼͷӨڹൣғΛڱΊΔ w
ϨϕϧʹΑΔ໌ࣔతͳ۠ผ

ೖग़ྗͱ௚઀ؔ܎͢Δ΋ͷͱɺͦ͏Ͱͳ͍΋ͷΛ෼͚Δ ௚઀ؔ܎͠ͳ͍΋ͷ͔Β6TF$BTFͱ&OUJUZΛݟ͚ͭΔ

͝੩ௌ͋Γ͕ͱ͏͍͟͝·ͨ͠

Clean Architecture 2

Clean Architecture 2

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