swift-actor-persistence

Swift data persistence becomes thread-safe by using actors to serialize access to shared mutable state. This pattern eliminates data races by design, combining an in-memory cache with file-backed storage for reliable concurrent operations.

Data races during concurrent file storage occur when multiple threads access shared mutable state without synchronization. Using Swift actors provides built-in mutual exclusion, safely serializing read and write operations to prevent these crashes.

Build an actor-based repository in Swift by defining an actor that wraps an in-memory cache and file persistence logic. It supports saving, deleting, finding by ID, and loading all items for Codable and Identifiable types.

Yes, Swift actor persistence works with Codable and Identifiable types. The repository pattern supports saving, deleting, finding by ID, and loading all items specifically for objects conforming to these protocols.

The best way to combine in-memory cache with file-backed storage in Swift is using an actor-based repository. This approach provides fast in-memory access while ensuring durable file persistence, secured against data races by Swift's concurrency model.