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Swift 中使用 actor 实现的线程安全数据持久化 —— 结合内存缓存与文件存储，从设计上消除数据竞争。

skills/swift-actor-persistence/SKILL.md

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# 使用 Swift Actors 实现线程安全持久化 (Swift Actors for Thread-Safe Persistence)

使用 Swift actor 构建线程安全数据持久化层的模式。该模式结合了内存缓存（In-memory caching）与基于文件的存储，利用 actor 模型（Actor model）在编译时消除数据竞争（Data races）。

## 何时启用

- 在 Swift 5.5+ 中构建数据持久化层
- 需要对共享可变状态（Shared mutable state）进行线程安全访问
- 希望消除手动同步操作（如 locks、DispatchQueues）
- 构建具有本地存储的离线优先（Offline-first）应用

## 核心模式 (Core Pattern)

### 基于 Actor 的仓库模式 (Actor-Based Repository)