swift-actor-persistence

Thread-safe local data persistence in Swift is achieved by using actor isolation to serialize state access, combining an in-memory cache with atomic JSON file writes to prevent data races across concurrent tasks.

An actor-based repository handles concurrent file writes by routing all save, delete, and find operations through a serialized executor, ensuring state mutations are isolated and preventing race conditions during disk persistence.

Yes, actor-based persistence requires Swift 5.5 or higher because it relies on the actor concurrency model and async APIs to enforce thread-safe state isolation for your Codable and Identifiable models.

The best way to cache Codable models locally for offline-first Swift apps is using a generic LocalRepository that maintains fast in-memory reads and automatically persists changes to a durable JSON file on disk.

Yes, you can use this actor-based persistence pattern for storing user settings, cached content, or user data, as it safely manages concurrent read and write operations through async public APIs.

Data races occur when multiple concurrent tasks access the same mutable state without synchronization; using Swift actors isolates repository state and serializes file writes to resolve this concurrency issue.