(iOSDC Japan 2024) Concurrency Safe SwiftData - 並行安全なSwiftDataの使い方

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6. 6 @Model class ExamResult { var score: Int }
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11. λΠϛϯά͕ζϨΔͱʁ 13 "DUPS
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12. λΠϛϯά͕ζϨΔͱʁ 15 "DUPS
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15. 4XJGU%BUBͷߏ੒ཁૉ 22 .PEFM$POUBJOFS .PEFM$POUFYU 1FSTJTUFOU.PEFM 'FUDI
    *OTFSU @Model class ExamResult { var studentID: Int var score: Int }
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18. 1FSTJTUFOU.PEFMΛ௚઀ฦ͢ 25 func fetchFirstResult() async throws -> ExamResult? { let context = ModelContext(modelContainer) return try context.fetch(FetchDescriptor<ExamResult>()) .first } @MainActor func updateLabel() async { let firstResult = try! await fetchFirstResult()! label.text = "Score: \(firstResult.score)" }
19. 1FSTJTUFOU.PEFMΛ௚઀ฦ͢ 26 func fetchFirstResult() async throws -> ExamResult? { let context = ModelContext(modelContainer) return try context.fetch(FetchDescriptor<ExamResult>()) .first } @MainActor func updateLabel() async { let firstResult = try! await fetchFirstResult()! label.text = "Score: \(firstResult.score)" }
20. 1FSTJTUFOU.PEFMΛ௚઀ฦ͢ 27 func fetchFirstResult() async throws -> ExamResult? { let context = ModelContext(modelContainer) return try context.fetch(FetchDescriptor<ExamResult>()) .first } @MainActor func updateLabel() async { let firstResult = try! await fetchFirstResult()! label.text = "Score: \(firstResult.score)" } Non-sendable type 'ExamResult?' returned by implicitly asynchronous call to nonisolated function cannot cross actor boundary
21. ʮ஋ʯΛऔಘ͍ͨ͠ͱ͖ 28 func fetchFirstResult() async throws -> ExamResult? { let context = ModelContext(modelContainer) return try context.fetch(FetchDescriptor<ExamResult>()) .first } @MainActor func updateLabel() async { let firstResult = try! await fetchFirstResult()! label.text = "Score: \(firstResult.score)" }
22. func fetchFirstResult() async throws -> ExamResult? { let context = ModelContext(modelContainer) return try context .fetch(FetchDescriptor<ExamResult>()) .first } ʮ஋ʯΛऔಘ͍ͨ͠ͱ͖ 29 /PO
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23. 4FOEBCMFͳ஋Ͱฦ͢ 30 func fetchFirstScore() async throws -> Int? { let context = ModelContext(modelContainer) return try context .fetch(FetchDescriptor<ExamResult>()) .first?.score } औಘ͞ΕΔ஋͕΄͍͠
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24. ࢀর͕ඞཁͳ৔߹ 31 @MainActor class ExamResultCell { var result: ExamResult? func fetch() async throws { result = try await fetchFirstResult() } func incrementScore() { result?.score += 10 } }
25. ࢀর͕ඞཁͳ৔߹ 32 @MainActor class ExamResultCell { var result: ExamResult? func fetch() async throws { result = try await fetchFirstResult() } func incrementScore() { result?.score += 10 } }
26. ࢀর͕ඞཁͳ৔߹ 33 @MainActor class ExamResultCell { var result: ExamResult? func fetch() async throws { result = try await fetchFirstResult() } func incrementScore() { result?.score += 10 } } Non-sendable type 'ExamResult?' returned by implicitly asynchronous call to nonisolated function cannot cross actor boundary
27. func fetchFirstResult() async throws -> ExamResult? { let context = ModelContext(modelContainer) return try context .fetch(FetchDescriptor<ExamResult>()) .first } ࢀর͕ඞཁͳ৔߹ 34 /PO
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28. func fetchFirstResultID() async throws -> PersistentIdentifier? { let context = ModelContext(modelContainer) return try context .fetchIdentifiers(FetchDescriptor<ExamResult>()) .first } 1FSTJTUFOU*EFOUJGJFSΛ࢖͏ 35 4FOEBCMF"
29. 1FSTJTUFOU*EFOUJGJFSΛ࢖͏ 36 @MainActor class MyListCell { var resultID: PersistentIdentifier? func fetch() async throws { resultID = try await fetchFirstResultID() } func incrementScore() throws { let result = try modelContainer.mainContext .fetch(FetchDescriptor<ExamResult>( predicate: #Predicate { $0.persistentModelID == resultID })).first result?.score += 10 } }
30. 1FSTJTUFOU*EFOUJGJFSΛ࢖͏ 37 @MainActor class MyListCell { var resultID: PersistentIdentifier? func fetch() async throws { resultID = try await fetchFirstResultID() } func incrementScore() throws { let result = try modelContainer.mainContext .fetch(FetchDescriptor<ExamResult>( predicate: #Predicate { $0.persistentModelID == resultID })).first result?.score += 10 } }
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33. ෆ࣮֬ͳ݁ՌΛ΋ͨΒ͢ྫ 42 "DUPS
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34. ෆ࣮֬ͳ݁ՌΛ΋ͨΒ͢ྫ 43 "DUPS
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35. ͜ͷίʔυ͸ฒߦ҆શͰ͸ͳ͍ 44 Task { let context = ModelContext(modelContainer) let result = try context.fetch(…).first! result.score += 10 try context.save() } Task { let context = ModelContext(modelContainer) let result = try context.fetch(…).first! result.score += 10 try context.save() } ˞
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38. 0WFSXSJUF 47 @Model class FooItem { var a = 1 var b = 10 var c = 100 }
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42. શͯͷϓϩύςΟ্͕ॻ͖͞ΕΔ 51 @Model class FooItem { var a = 1 var b = 10 var c = 100 } item.a = 2 item.b = 20 item.a = 3 item.c = 300 ࣌ؒ @Model class FooItem { var a = 3 var b = 10 var c = 300 } item.b = 10
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53. NBJO$POUFYUͷซ༻ 63 struct ExamResultList: View { @Query private var results: [ExamResult] var body: some View { List(results) { result in Text("score: \(result.score)") } } } let list = ExamResultList() .modelContext(ModelContext(container)) @Query ϚΫϩ͸NBJO$POUFYUͷར༻Λڧ੍͢Δɻ ඞͣ.BJO"DUPS
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66. 4DIFEVMFSͷ࣮૷ྫ 76 /// A primitive scheduler implementation of concurrent read and sequential write policy actor AccessScheduler { private enum OperationType { case read, write } private struct Operation { let id: UUID let continuation: CheckedContinuation<Void, Never> let type: OperationType } let container: ModelContainer private var executingOperations: [Operation] = [] private var pendingOperations: [Operation] = [] // TODO: use queue init(container: ModelContainer) { self.container = container } /// Executes the given block sequentially as a writing transaction. /// - Parameter block: the writing transaction /// - Returns: the value which the given transaction block returns @discardableResult func executeWrite<T>(block: @Sendable (ModelContext) throws -> T) async rethrows -> T where T: Sendable { try await _execute(type: .write) { try block(ModelContext(self.container)) } } /// Executes the given block concurrently as a reading transaction. /// > Warning: Do not perform any operations which modify the persisted data. /// - Parameter block: the reading transaction /// - Returns: the value which the given transaction block returns func executeRead<T>(block: @Sendable @escaping (ModelContext) -> T) async -> T where T: Sendable { await _execute(type: .read) { await Task.detached { block(ModelContext(self.container)) }.value } } /// Executes the given block concurrently as a reading transaction. /// > Warning: Do not perform any operations which modify the persisted data. /// - Parameter block: the reading transaction /// - Returns: the value which the given transaction block returns func executeRead<T>(block: @Sendable @escaping (ModelContext) throws-> T) async throws -> T where T: Sendable { try await _execute(type: .read) { try await Task.detached { try block(ModelContext(self.container)) }.value } } private func _execute<T>( type: OperationType, block: () async throws-> T ) async rethrows -> T where T: Sendable { let id = UUID() await withCheckedContinuation { pendingOperations.append(Operation(id: id, continuation: $0, type: type)) popPendingOperations() } let result = try await block() executingOperations.removeAll { $0.id == id } popPendingOperations() return result } private func popPendingOperations() { guard executingOperations.isEmpty else { return } while !pendingOperations.isEmpty { let pendingOperation = pendingOperations.removeFirst() executingOperations.append(pendingOperation) pendingOperation.continuation.resume() guard pendingOperation.type == .read else { // Allow only one execution break } } } } IUUQTHJTUHJUIVCDPNUFBNIJNFI EFGGCDCFCD
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