(iOSDC Japan 2023) ActorでCoreDataをスレッドから解放しよう

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$PSF%BUB ҆શʹ࢖͍ͬͯ·͔͢ʁ 3

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͜ͷτʔΫͷର৅ w $PSF%BUBͱ4XJGU$PODVSSFODZΛগ͠Ͱ΋৮ͬͨ͜ͱ͕͋Δਓ w ඇಉظॲཧ΍σʔλڝ߹ʹۤ͠Μͩ͜ͱ͕͋Δਓ 7

$PSF%BUBͷ εϨουҧ൓ͱ͸ͳʹ͔ʁ 8

͜ͷίʔυ͸҆શͳ࣮૷͔ʁ 9 class CoreDataController { private var entity: CoreDataEntity? =
nil private let moc: NSManagedObjectContext init(container: NSPersistentContainer) { self.moc = container.newBackgroundContext() } func configure() throws { entity = CoreDataEntity(context: moc) try moc.save() } }

10 class CoreDataController { private var entity: CoreDataEntity? = nil
private let moc: NSManagedObjectContext init(container: NSPersistentContainer) { self.moc = container.newBackgroundContext() } func configure() throws { entity = CoreDataEntity(context: moc) try moc.save() } } .BOBHFEPCKFDUDPOUFYUΛൃߦ .BOBHFEPCKFDUΛੜ੒ɺอଘ ͜ͷίʔυ͸҆શͳ࣮૷͔ʁ

͜ͷ࣮૷͸εϨουηʔϑͰ͸ͳ͍ 11 class CoreDataController { private var entity: CoreDataEntity? =
nil private let moc: NSManagedObjectContext init(container: NSPersistentContainer) { self.moc = container.newBackgroundContext() } func configure() throws { entity = CoreDataEntity(context: moc) try moc.save() } } initͱҟͳΔεϨου͔Β ΞΫηεͯ͠͸͍͚ͳ͍

nil private let moc: NSManagedObjectContext init(container: NSPersistentContainer) { self.moc = container.newBackgroundContext() } func configure() throws { entity = CoreDataEntity(context: moc) try moc.save() } } /4.BOBHFE0CKFDUͱ/4.BOBHFE0CKFDU$POUFYU͸ εϨουηʔϑͰ͸ͳ͍ɻ

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"QQMF%FWFMPQFS%PDVNFOUBUJPOʰ/4.BOBHFE0CKFDU$POUFYUʱΑΓ

"DUPSʹ͢Ε͹େৎ෉ʁ 16 actor CoreDataController { private var entity: CoreDataEntity? =

17 w "DUPSʹ͢Ε͹σʔλڝ߹͠ͳ͍͸ͣʜ actor CoreDataController { private var entity: CoreDataEntity?
= nil private let moc: NSManagedObjectContext init(container: NSPersistentContainer) { self.moc = container.newBackgroundContext() } func configure() throws { entity = CoreDataEntity(context: moc) try moc.save() } } "DUPSʹ͢Ε͹େৎ෉ʁ

18 w "DUPSʹ͢Ε͹σʔλڝ߹͠ͳ͍͸ͣʜ actor CoreDataController { private var entity: CoreDataEntity?
= nil private let moc: NSManagedObjectContext init(container: NSPersistentContainer) { self.moc = container.newBackgroundContext() } func configure() throws { entity = CoreDataEntity(context: moc) try moc.save() } } ͜ͷ࣮૷͸$PODVSSFODZXBSOJOHΛग़͞ͳ͍ɻ "DUPSʹ͢Ε͹େৎ෉ʁ

actor CoreDataController { private var entity: CoreDataEntity? = nil private
let moc: NSManagedObjectContext init(container: NSPersistentContainer) { self.moc = container.newBackgroundContext() } func configure() throws { entity = CoreDataEntity(context: moc) try moc.save() } } 19 w "DUPSCPVOEBSZ֎͔Β͜ͷBDUPSΛ࢖ͬͯΈΔɻ func testCallCoreDataController() async throws { let controller = CoreDataController( container: container ) try await controller.configure() } "DUPSʹ͢Ε͹େৎ෉ʁ

let moc: NSManagedObjectContext init(container: NSPersistentContainer) { self.moc = container.newBackgroundContext() } func configure() throws { entity = CoreDataEntity(context: moc) try moc.save() } } 20 w ͜ͷ࣮૷͸εϨουҧ൓ΛҾ͖ى͜͢ɻ ͜͜ͰΫϥογϡ "DUPSʹ͢Ε͹େৎ෉ʁ

let moc: NSManagedObjectContext init(container: NSPersistentContainer) { self.moc = container.newBackgroundContext() } func configure() throws { entity = CoreDataEntity(context: moc) try moc.save() } } "DUPS͸εϨουಉҰੑΛอূ͠ͳ͍ 21 w JOJUͱDPOpHVSF͕ݺ͹ΕΔεϨου͸ɺ࣮ࡍʹ͸ҟͳΔɻ func testCallCoreDataController() async throws { let controller = CoreDataController( container: container ) try await controller.configure() }

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class CoreDataController { private var entityID: NSManagedObjectID? = nil private
let container: NSPersistentContainer func update(_ newName: String) async throws { guard let entityID else { return } let moc = container.newBackgroundContext() try await moc.perform { let entity = try? moc.existingObject(with: entityID) as? CoreDataEntity entity?.name = newName try moc.save() } } } /4.BOBHFE0CKFDU*%Λ࢖͏ 24

let container: NSPersistentContainer func update(_ newName: String) async throws { guard let entityID else { return } let moc = container.newBackgroundContext() try await moc.perform { let entity = try? moc.existingObject(with: entityID) as? CoreDataEntity entity?.name = newName try moc.save() } } } /4.BOBHFE0CKFDU*%Λ࢖͏ 25 ࣮ࡍͷNBOBHFEPCKFDUͷܕͷ͔ΘΓʹ /4.BOBHFE0CKFDU*%Λ࢖༻ .BOBHFEPCKFDUʹΞΫηε͢Δʹ͸GFUDI͢Δ

let container: NSPersistentContainer func update(_ newName: String) async throws { guard let entityID else { return } let moc = container.newBackgroundContext() try await moc.perform { let entity = try? moc.existingObject(with: entityID) as? CoreDataEntity entity?.name = newName try moc.save() } } } /4.BOBHFE0CKFDU*%Λ࢖͏ 26 .BOBHFE0CKFDUʹΞΫηε͢Δʹ͸ ຖճGFUDI͠ͳ͚Ε͹ͳΒͳ͍ .BOBHFE0CKFDUͷܕ৘ใ͕ͳ͍

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w /4.BOBHFE0CKFDUͷ͔ΘΓʹ/4.BOBHFE0CKFDU*%ΛϓϩύςΟ ͱͯ͠อ࣋͢Δɻ w /4.BOBHFE0CKFDU*%ʹ͸ܕ৘ใ͕ͳ͍ɻ w .BOBHFEPCKFDUʹΞΫηε͢Δʹ͸౎౓GFUDIͤͶ͹ͳΒͳ͍ɻ 28 4XJGU$PODVSSFODZͰ.BOBHFE0CKFDUΛ҆શʹอ͍࣋ͨ͠ʂ εϨουҧ൓Λ๷͙ैདྷख๏

.BOBHFE0CKFDUΛ ҆શʹอ࣋͢Δʹ͸ʁ 29

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35

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(MPCBMBDUPSʹΑͬͯσʔλڝ߹͕ൃੜ͠ͳ͍͜ͱ͕อূ͞ΕΔ͔Βɻ 36 @MainActor var mainActorIsolatedValue: Int?

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public actor CoreDataActor { public static let shared = CoreDataActor() }

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@CoreDataActor public class CoreDataEntity: NSManagedObject {}

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CAManagedObjectContext { private let moc: NSManagedObjectContext init(_ moc: NSManagedObjectContext) { self.moc = moc } func fetch<…>(…) throws -> [T] { … } func save() throws { try moc.save() } func delete(_ object: NSManagedObject) { … } func insert<T: NSManagedObject>() -> T { … } }

40

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w $VTUPN"DUPS&YFDVUPSΛར༻͢Δɻ 42

"DUPSͷ࣮ߦ؀ڥ 43 actor MyActor { … } w "DUPS͸ɺσʔλڝ߹͕ൃੜ͠ͳ͍͜ͱΛอূ͢Δɻ w
ಉظతʹ࣮ߦ͢Δ໋ྩͷ·ͱ·ΓͰ͋Δʮ+PCʯΛҰ࣮ͭͣͭߦɻ

"DUPSͷ࣮ߦ؀ڥ 44 actor MyActor { … } w "DUPS͸ɺσʔλڝ߹͕ൃੜ͠ͳ͍͜ͱΛอূ͢Δɻ w
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VOPXOFE&YFDVUPSͱͯ͠ɺ+PCΛ࣮ߦ͢Δ&YFDVUPSΛొ࿥͢Δɻ 45 actor MyActor { nonisolated var unownedExecutor: UnownedSerialExecutor { ... } }

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(MPCBMBDUPSʹొ࿥͢Δɻ 46

$PSF%BUB&YFDVUPSͷ࣮૷ w KPCΛ/4.BOBHFE0CKFDU$POUFYUQFSGPSN @ Ͱ࣮ߦ͢Δɻ 47 final class CoreDataExecutor: SerialExecutor
{ private let container: MOCContainer func enqueue(_ job: consuming ExecutorJob) { let unownedJob = UnownedJob(job) container.perform { unownedJob.runSynchronously( on: self.asUnownedSerialExecutor() ) } } }

$PSF%BUB&YFDVUPSͷ࣮૷ 48 final class CoreDataExecutor: SerialExecutor { private let container:
MOCContainer func enqueue(_ job: consuming ExecutorJob) { let unownedJob = UnownedJob(job) container.perform { unownedJob.runSynchronously( on: self.asUnownedSerialExecutor() ) } } } w KPCΛ/4.BOBHFE0CKFDU$POUFYUQFSGPSN @ Ͱ࣮ߦ͢Δɻ +PCΛQFSGPSNؔ਺಺Ͱ࣮ߦ

MOCContainer func enqueue(_ job: consuming ExecutorJob) { let unownedJob = UnownedJob(job) container.perform { unownedJob.runSynchronously( on: self.asUnownedSerialExecutor() ) } } } w KPCΛ/4.BOBHFE0CKFDU$POUFYUQFSGPSN @ Ͱ࣮ߦ͢Δɻ &YFDVUPS+PC͸/PODPQZBCMFUZQF ʢ4XJGUͰಋೖʣ

MOCContainer func enqueue(_ job: consuming ExecutorJob) { let unownedJob = UnownedJob(job) container.perform { unownedJob.runSynchronously( on: self.asUnownedSerialExecutor() ) } } } w 4FSJBM&YFDVUPS͸4FOEBCMFͰ͋Δ͜ͱΛཁٻ͢Δɻ /4.BOBHFE0CKFDU$POUFYUΛ 4FOEBCMFͳ΋ͷͱͯ͠ѻ͏ͨΊͷίϯςφ

.0$$POUBJOFSͷ࣮૷ w .0$ͷQFSGPSNΛεϨουηʔϑʹݺͿͨΊͷίϯςφ 51 final class MOCContainer: @unchecked Sendable {
private let persistentContainer: NSPersistentContainer let queue = DispatchQueue(label: "MOCContainer") lazy var moc: NSManagedObjectContext = persistentContainer.newBackgroundContext() init(_ persistentContainer: NSPersistentContainer) { self.persistentContainer = persistentContainer } func perform(_ block: @escaping @Sendable () -> Void) { queue.async { self.moc.perform(block) } } }

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moc: CAManagedObjectContext { .init(container.moc) } static var sharedExecutor = CoreDataExecutor.init(.shared) static var sharedUnownedExecutor: UnownedSerialExecutor { sharedExecutor.asUnownedSerialExecutor() } }

(MPCBMBDUPSʹ&YFDVUPSΛొ࿥ w $PSF%BUB"DUPSͷVOPXOFE&YFDVUPSͱͯ͠ɺ $PSF%BUB&YFDVUPSͷTIBSFEΠϯελϯεΛฦ͢Α͏ʹ͢Δɻ w $PSF%BUB"DUPSʹର͢Δૢ࡞͸͢΂ͯɺ$PSF%BUB&YFDVUPS͕؅ཧ ͢Δ.0$ͷQFSGPSNؔ਺Ͱ࣮ߦ͞ΕΔΑ͏ʹͳͬͨɻ 53 extension CoreDataActor
{ public nonisolated var unownedExecutor: UnownedSerialExecutor { CoreDataExecutor.sharedUnownedExecutor } }

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w $VTUPN"DUPS&YFDVUPSΛར༻͢Δɻ w &YFDVUPSͷڞ௨.0$ͷQFSGPSNؔ਺Ͱ͢΂ͯͷ+PCΛ࣮ߦɻ 54

͜ΕͰεϨουηʔϑʹͳͬͨͷ͔ʁ ࠷΋جຊతͳ$36%ૢ࡞ͦΕͧΕʹ͍ͭͯɺ w $PSF%BUB"DUPS಺͔ΒͷΞΫηε w $PSF%BUB"DUPS֎͔ΒͷΞΫηε ͷ৔߹ʹɺͲͷΑ͏ʹίϯύΠϥʹνΣοΫ͞ΕΔ͔Λݟ͍ͯ͘ɻ 57

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throws -> Entity { let moc = CoreDataExecutor.sharedExecutor.moc let managedObject: Entity = moc.insert() try moc.save() return managedObject }

@AnotherActor func createObject() throws -> Entity { let moc =
CoreDataExecutor.sharedExecutor.moc let managedObject: Entity = moc.insert() try moc.save() return managedObject } $SFBUFૢ࡞ʢ$PSF%BUB"DUPS֎ʣ 59 ίϯύΠϧΤϥʔ BXBJU͕ඞཁ w .BOBHFEPCKFDU͓Αͼ.0$͸ɺඇಉظΞΫηε͕ڧ੍͞ΕΔ

$SFBUFૢ࡞ʢ$PSF%BUB"DUPS֎ʣ 60 @AnotherActor func createObject() async throws -> Entity {
let moc = await CoreDataExecutor.sharedExecutor.moc let managedObject: Entity = await moc.insert() try await moc.save() return managedObject } w .BOBHFEPCKFDU͓Αͼ.0$͸ɺඇಉظΞΫηε͕ڧ੍͞ΕΔ

3FBEૢ࡞ʢ$PSF%BUB"DUPS಺ʣ 61 @CoreDataActor func fetchObject() throws -> Entity? { let
moc = CoreDataExecutor.sharedExecutor.moc let fetchRequest = Entity.fetchRequest() fetchRequest.entity = Entity.entity() let managedObjects = try moc.fetch(fetchRequest) return managedObjects.first } w .0$͸ɺ$PSF%BUB&YFDVUPS͕ఏڙ͢Δ $".BOBHFE0CKFDU$POUFYUΦϒδΣΫτΛ༻͍Δɻ w $PSF%BUB"DUPS಺ͳͷͰɺಉظతʹૢ࡞Ͱ͖Δɻ

3FBEૢ࡞ʢ$PSF%BUB"DUPS֎ʣ w /4'FUDI3FRVFTU͸4FOEBCMFͰͳ͍ɻ w $PSF%BUB"DUPS಺Ͱ૊Έཱͯ.0$ʹ౉͢͜ͱ͕ඞཁɻ 62 @AnotherActor func fetchObject() async
throws -> Entity? { let moc = await CoreDataExecutor.sharedExecutor.moc let managedObjects = try await Task { @CoreDataActor in let fetchRequest = Entity.fetchRequest() fetchRequest.entity = Entity.entity() return try moc.fetch(fetchRequest) }.value return managedObjects.first }

6QEBUFૢ࡞ʢ$PSF%BUB"DUPS಺ʣ 63 @CoreDataActor func updateObject(managedObject: Entity) throws { // nameΛupdate͢Δ
let moc = CoreDataExecutor.sharedExecutor.moc managedObject.name = "Jiro" try moc.save() } w .0$͸ɺ$PSF%BUB&YFDVUPS͕ఏڙ͢Δ $".BOBHFE0CKFDU$POUFYUΦϒδΣΫτΛ༻͍Δɻ w $PSF%BUB"DUPS಺ͳͷͰɺಉظతʹૢ࡞Ͱ͖Δɻ

6QEBUFૢ࡞ʢ$PSF%BUB"DUPS֎ʣ w 4FUUFS͸BDUPS֎ʹެ։͞Εͳ͍ͨΊɺ$PSF%BUB"DUPS಺Ͱͷૢ࡞ ͕ڧ੍͞ΕΔɻ 64 @AnotherActor func updateObject(managedObject: Entity) async
throws { // nameΛupdate͢Δ try await Task { @CoreDataActor in let moc = CoreDataExecutor.sharedExecutor.moc managedObject.name = "Jiro" try moc.save() }.value }

%FMFUFૢ࡞ʢ$PSF%BUB"DUPS಺ʣ 65 @CoreDataActor func deleteObject(managedObject: Entity) throws { let moc
= CoreDataExecutor.sharedExecutor.moc moc.delete(managedObject) try moc.save() } w .0$͸ɺ$PSF%BUB&YFDVUPS͕ఏڙ͢Δ $".BOBHFE0CKFDU$POUFYUΦϒδΣΫτΛ༻͍Δɻ w $PSF%BUB"DUPS಺ͳͷͰɺಉظతʹૢ࡞Ͱ͖Δɻ

%FMFUFૢ࡞ʢ$PSF%BUB"DUPS֎ʣ 66 @AnotherActor func deleteObject(managedObject: Entity) async throws { let
moc = await CoreDataExecutor.sharedExecutor.moc await moc.delete(managedObject) try await moc.save() } w .BOBHFEPCKFDU͓Αͼ.0$͸ɺඇಉظΞΫηε͕ڧ੍͞ΕΔ

࠷ॳͷίʔυ͸Ͳ͏ͳͬͨͷ͔ 67 class CoreDataController { private var entity: CoreDataEntity? =

͜͏ͳΓ·ͨ͠ 68 @CoreDataActor class CoreDataController { private var entity: CoreDataEntity?
= nil func configure() throws { let moc = CoreDataExecutor.sharedExecutor.moc entity = moc.insert() try moc.save() } }

͜͏ͳΓ·ͨ͠ 69 @CoreDataActor class CoreDataController { private var entity: CoreDataEntity?
= nil func configure() throws { let moc = CoreDataExecutor.sharedExecutor.moc entity = moc.insert() try moc.save() } } w $MBTTࣗମΛ$PSF%BUB"DUPSʹॴଐͤ͞Δɻ w ҆શʹNBOBHFEPCKFDUΛϓϩύςΟͱͯ͠อ࣋ɻ

·ͱΊ w NBOBHFEPCKFDUͱNBOBHFEPCKFDUDPOUFYUΛɺHMPCBMBDUPS Λ༻͍ͯεϨουηʔϑʹ͢Δ͜ͱΛࢼΈͨɻ w $VTUPNBDUPSFYFDVUPSΛར༻͢Δ͜ͱͰɺ࣮ߦεϨουͷಉҰ ੑΛ࣮ݱͰ͖Δɻ w $36%ૢ࡞ʹ͍ͭͯɺBDUPSڥք಺͔Β͸શͯಉظతʹૢ࡞͕Մೳͳ ҰํͰɺBDUPSڥք֎͔Β͸ඇಉظΞΫηεΛཁٻͰ͖ͨɻ
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(iOSDC Japan 2023) ActorでCoreDataをスレッドから解放しよう

(iOSDC Japan 2023) ActorでCoreDataをスレッドから解放しよう

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