swift-actor-persistence

Thread-safe data persistence in Swift is achieved by using an actor-based repository pattern, which serializes access to shared mutable state. This combines an in-memory cache with atomic file-backed persistence to prevent data races during concurrent access.

Swift actor isolation offloads synchronization complexity from the caller by serializing access to shared mutable state. It maintains an in-memory cache that stays in sync with durable atomic disk writes, ensuring safe concurrent file writes for offline-first storage scenarios.

Yes, you can use Swift actors to cache and persist generic Codable and Identifiable models locally. The actor-based repository pattern allows flexible reuse for various model types while providing thread-safe async save, delete, and query operations.

The best way to synchronize an in-memory cache with disk storage in Swift is using an actor-based repository. It ensures the in-memory cache stays continuously in sync with atomic file writes to disk, providing safe serialized access and durable persistence.

You should not use Swift actors for local data persistence if your app doesn't require concurrent access to shared mutable state or offline-first storage. Actors are designed for safe serialized access, so single-threaded or non-shared state scenarios won't benefit from this overhead.