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swift-actor-persistence

Implements thread-safe Swift persistence using actors with in-memory caching and file-backed storage.

Updated Mar 25, 2026
Search Tags:#concurrency#json#swift#ios#persistence#actors#thread-safety
One-click install
npx skills add https://github.com/Femad-6/my-skills --skill swift-actor-persistence-femad-6
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: swift-actor-persistence
Source: https://github.com/Femad-6/my-skills/tree/main/.github/skills/swift-actor-persistence
Command: npx skills add https://github.com/Femad-6/my-skills --skill swift-actor-persistence-femad-6

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve? Shared mutable state in Swift apps often requires manual synchronization with locks or DispatchQueues, which is error-prone and can cause data races. This Skill provides a pattern for building persistence layers where the Swift compiler enforces thread safety through the actor model. ## Core Features & Use Cases - Actor-Based Repository: A generic LocalRepository<T: Codable & Identifiable> actor that serializes all access, eliminating data races at compile time. - In-Memory Cache with File Persistence: O(1) dictionary lookups for reads and atomic JSON file writes for durable storage. - SwiftUI Integration: Combines with @Observable ViewModels for reactive UI updates backed by the repository. - Use Case: Building an offline-first iOS app that stores user questions locally — reads come from the fast cache while writes persist atomically to disk, surviving crashes without corruption. ## Quick Start Ask the AI to create a thread-safe local repository in Swift using an actor with in-memory caching and atomic JSON file persistence for your Codable model type.

Frequently Asked Questions about swift-actor-persistence

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I make data persistence thread-safe in Swift?▼

Use a Swift actor as a repository that owns the mutable state. The compiler serializes all actor method calls, so concurrent access to the cache and file storage cannot produce data races, with no manual locks required.

How to combine Swift actors with SwiftUI Observable ViewModels?▼

Create an @Observable ViewModel class that holds a reference to the actor repository and exposes async methods. Call repository methods with await, then update the published state properties so SwiftUI re-renders automatically.

Should I use actors or DispatchQueue for thread safety in Swift?▼

For new Swift concurrency code, actors are preferred because thread safety is enforced at compile time rather than by convention. DispatchQueue and NSLock remain common in legacy code but require manual discipline to avoid races.

Why use atomic file writes when persisting data in Swift?▼

Atomic writes via the .atomic option write to a temporary file first, then move it into place. This prevents corrupted or partial data files if the app crashes or is terminated mid-write.

What are the limitations of actor-based local persistence?▼

All actor calls are async, so callers must operate in an async context. The pattern loads the entire dataset into memory, which suits small local datasets but not large databases where Core Data or SQLite would fit better.

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