swift-actor-persistence

You can prevent data races in Swift by using an actor-based persistence layer that provides thread-safe access to your Codable models. Actor isolation handles synchronization automatically, eliminating manual locks when saving to disk.

The best way to build an offline-first data cache in Swift is using an actor-based local repository. This approach combines an in-memory cache for fast reads with atomic file-backed persistence to ensure durable local storage.

To set up thread-safe local persistence in Swift 5.5+, instantiate an actor-based LocalRepository for your data models. Your models must conform to Codable and Identifiable, allowing you to perform safe save, delete, and load operations.

Thread-safe file persistence in Swift does not require manual synchronization when using actor isolation. The actor-based repository handles concurrent access internally, reducing the boilerplate code needed to prevent race conditions.

You can use an actor-based repository for any Swift data model that conforms to the Codable and Identifiable protocols. This constraint allows the persistence layer to serialize data and manage file storage for any matching model type.