Clean Architecture 2

ΫϦʔϯΞʔΩςΫνϟ
࣮ફͷࣄ࢝Ί
ٕज़ษڧձ

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લճͷ࿩୊
w ΫϦʔϯΞʔΩςΫνϟͷ؊
w #VTJOFTT3VMFT
w &OUJUZ
$SJUJDBM

w 6TF$BTF "QQMJDBUJPOTQFDJpD

w ґଘΛҰํ޲ʹอͭ

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ࠓճͷ࿩୊
w &OUJUZ $SJUJDBM

w 6TF$BTF "QQMJDBUJPOTQFDJpD

w ࣸਅͷ&YJG΍.FUBEBUBΛѻ͏ΞϓϦ
w -FWFM ϨΠϠʔ
ؒͷσʔλͷड͚౉͠ํ๏

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໨ඪ
୲౰Ҋ݅ͷ
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Λ۠ผͰ͖Δؾ͕͢Δ

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

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<&OUJUZ>
.FUBEBUB
<6TF$BTF>
.FUBEBUB-JTU
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6*

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&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
}

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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༻

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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)
}
}

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%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)
}

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%BUB4USVDUVSF
extension BrowsingMetadata {
private init(_ metadata: Metadata)
}
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w !UFTUBCMFJNQPSUͰར༻

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<&OUJUZ>
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γφϦΦ
w ΍ͬͺΓιʔτػೳͷ௥Ճґཔ
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w ॳظදࣔ͸γφϦΦͷॱෆಉͰͷฒͼʹͳΔ

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

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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 {
}

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6TF$BTF ௥Ճ

internal extension MetadataListSortKey : CaseIterable {
}
func browseSortKeys()
}
func didProvideSortKeys(_: [MetadataListSortKey])
}

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6TF$BTF ௥Ճ

public enum MetadataListSortKey {
case iso, focalLength, exposureValue
case lensAperture, exposureDuration
}
func browseOrderedMetadata(by key: MetadataListSortKey)
}
func didProvideSortedMetadataToBrowse(_: [BrowsingMetadata])
}

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

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

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<&OUJUZ>
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γφϦΦ
w ϝλσʔλΛվ͟ΜͰ͖Δػೳͷ௥Ճґཔ
w ಛఆͷϝλσʔλ͚͕ͩฤूՄೳ
w ݩͷࣸਅͱஔ͖׵͑ͯอଘ

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

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6TF$BTF *'

public struct ModifyingMetadata {
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)
}

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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)
}
}

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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)
}
}

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

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%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

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<&OUJUZ>
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γφϦΦͷ·ͱΊ
w ૢ࡞खॱͷ௥Ճɾมߋ͸ɺ6TF$BTFͷ௥ՃɾมߋͰରԠ
w ػೳͷ௥Ճɾมߋ͸ɺ&OUJUZͱ6TF$BTFͷ௥ՃɾมߋͰରԠ
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w ϨϕϧؒͰड͚౉͞ΕΔσʔλߏ଄ମ͸ɺ4XJGUͷTUSVDU͕ศར

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ͦͷଞͷ
&OUJUZͱ6TF$BTF

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"MFSU$POUSPMMFS J04

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

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"MFSU$POUSPMMFS J04

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)
}
}

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"MFSU$POUSPMMFS J04

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)
}
}
}
}

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"MFSU$POUSPMMFS J04

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)
}
}

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"MFSU$POUSPMMFS J04

final class UserInformationUpdateUseCase: UserInfoUpdateInteractor {
let output: UserInformationUpdateOutput
func update(_ user: UserInformationUpdateOutput) {
// ...
let error = // ...
output.didFailToUpdateUserInformation(with: error)
}
}

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"MFSU$POUSPMMFS J04

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w ํ਑ΛܾΊͯͲͷํ๏Ͱ࣮ݱ͢Δ͔Λ౷Ұ
w ଥڠϙΠϯτ

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

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όϦσʔγϣϯ
w ਺஋Λظ଴͢ΔϑΥʔϜͷೖྗ஋ 4USJOH
ͷݕূ
ˠ6TF$BTF͕୲౰͢Δ
w &OUJUZΑΓ΋ೖྗʹ͍ۙ ԼҐϨϕϧ

w ͲΜͳૢ࡞ํ๏Ͱೖྗ͞ΕΔͷ͔͸γεςϜͷཁ݅

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όϦσʔγϣϯ
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l-FWFMzͰ͓͞Β͍
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w ΑΓ-FWFM͕ߴ͍΄͏Λ&OUJUZʹ෼཭

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໨ඪ
୲౰Ҋ݅ͷ
&OUJUZͱ6TF$BTF

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

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

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໨ඪ
୲౰Ҋ݅ͷ
&OUJUZͱ6TF$BTF

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Clean Architecture 2

Clean Architecture 2

Takuma Shimizu

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