Swift Actors for Thread-Safe Persistence

Lifecycle Position

Phase 3 (Implement). Load when building local data storage, offline-first patterns, or caching layers. Related: swift-concurrency for general actor patterns, swift-networking for server sync.

When to Use

• Building a local data persistence layer
• Need thread-safe access to shared mutable state with disk backing
• Want compile-time data race elimination (no manual locks or queues)
• Building offline-first apps with local storage
• Replacing legacy DispatchQueue-based file managers

Core Pattern: Actor-Based Repository

The actor model guarantees serialized access — no data races, enforced by the compiler.