swift-actor-persistence

The swift-actor-persistence skill provides a robust solution for thread-safe data persistence in Swift applications. By leveraging Swift's actor model, it ensures serialized access to shared mutable state, eliminating the risk of data races at compile time. This approach replaces traditional synchronization mechanisms like locks or DispatchQueues, allowing developers to build reliable persistence layers that combine in-memory caching with durable file-backed storage. The skill is designed for Swift 5.5 and above, targeting developers seeking a streamlined method to manage concurrent data safely and efficiently.

Key features include an actor-based repository pattern that automatically serializes read and write operations, ensuring that all access to the internal cache is thread-safe. The repository supports generic types constrained to Codable and Identifiable, making it reusable for any model type. Data is cached in memory for fast O(1) retrieval and persisted to disk atomically to prevent partial writes in case of crashes. The skill also integrates smoothly with observable view models, enabling reactive UI updates while maintaining thread-safe persistence. Initialization is synchronous to avoid the complexity of async constructors, and the public API is minimal, exposing only domain-specific operations like save, delete, and loadAll.

This skill is particularly useful for developers building offline-first Swift applications, apps with local storage requirements, or any project where concurrent data access could lead to race conditions. It is ideal for those who want to reduce boilerplate synchronization code and rely on compiler-enforced safety. By adopting swift-actor-persistence, developers can achieve both high performance and reliability, making it suitable for mobile apps, desktop applications, and Swift-based server-side solutions that require robust, thread-safe persistence mechanisms.