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chore: import upstream snapshot with attribution
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1.8 KiB

paths
paths
**/*.swift
**/Package.swift

Swift パターン

このファイルは common/patterns.md を Swift 固有のコンテンツで拡張します。

プロトコル指向設計

小さく焦点を絞ったプロトコルを定義する。共有デフォルトにはプロトコル拡張を使用する:

protocol Repository: Sendable {
    associatedtype Item: Identifiable & Sendable
    func find(by id: Item.ID) async throws -> Item?
    func save(_ item: Item) async throws
}

値型

  • データ転送オブジェクトとモデルには構造体を使用する
  • 異なる状態をモデリングするには関連値付きの列挙型を使用する:
enum LoadState<T: Sendable>: Sendable {
    case idle
    case loading
    case loaded(T)
    case failed(Error)
}

アクターパターン

ロックやディスパッチキューの代わりに、共有ミュータブル状態にはアクターを使用する:

actor Cache<Key: Hashable & Sendable, Value: Sendable> {
    private var storage: [Key: Value] = [:]

    func get(_ key: Key) -> Value? { storage[key] }
    func set(_ key: Key, value: Value) { storage[key] = value }
}

依存性注入

デフォルトパラメータ付きでプロトコルを注入する — 本番ではデフォルトを使用し、テストではモックを注入する:

struct UserService {
    private let repository: any UserRepository

    init(repository: any UserRepository = DefaultUserRepository()) {
        self.repository = repository
    }
}

参考

アクターベースの永続化パターンについてはスキル: swift-actor-persistence を参照。 プロトコルベースの DI とテストについてはスキル: swift-protocol-di-testing を参照。