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swift-actor-persistence

Serialize actor-based repository access and atomically write JSON files.

Updated Sep 13, 2025
Search Tags:#caching#swift#persistence#offline-first#actors#thread-safety#json storage
One-click install
npx skills add https://github.com/llmh333/employee_management_spring --skill swift-actor-persistence-llmh333
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: swift-actor-persistence
Source: https://github.com/llmh333/employee_management_spring/tree/main/.gemini/skills/swift-actor-persistence
Command: npx skills add https://github.com/llmh333/employee_management_spring --skill swift-actor-persistence-llmh333

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

This Skill solves the problem of unsafe concurrent access to shared mutable state by providing a thread-safe persistence pattern that avoids data races when multiple parts of an app read and write local data.

Core Features & Use Cases

  • Actor-based repository: Use an actor to guarantee serialized access to the in-memory cache, removing the need for locks or manual synchronization.
  • In-memory caching + file-backed persistence: Read quickly from memory while persisting changes atomically to a JSON file for durability.
  • Generic, reusable design: Reuse the same repository for any model that is both Codable and Identifiable with a String ID, supporting offline-first and local-storage use cases.

Use Case: In an offline-first iOS/macOS app, store user-generated entities (for example, drafts, notes, or settings) locally so the UI can load instantly from cache and still survive app restarts via atomic JSON writes.

Quick Start

Ask the system to create a type-safe LocalRepository actor for your Codable & Identifiable model and persist it to an atomic JSON file while accessing it with await.

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 local Swift persistence thread-safe for concurrent reads and writes?▼

Thread-safe Swift persistence is achieved by using an actor-based repository that serializes access to an in-memory cache and atomically writes updates to a local JSON file, preventing data races without manual locks.

What is the best way to persist Codable Swift models to local storage offline?▼

The best way to persist Codable Swift models offline is using a generic actor repository that requires Identifiable models with String identifiers, providing fast O(1) cache lookups and atomic JSON file writes for durability.

Does this Swift actor persistence pattern work with offline-first iOS and macOS apps?▼

Yes, this Swift actor persistence pattern works with offline-first iOS and macOS apps, allowing the UI to load instantly from an in-memory cache while surviving app restarts through atomic file writes.

How do actors prevent data races when accessing a shared local data store in Swift?▼

Actors prevent data races by serializing access to the shared mutable state of the in-memory cache, removing the need for manual synchronization or locks during concurrent read and write operations.

When should I use an actor-based local repository instead of direct JSON file storage in Swift?▼

You should use an actor-based local repository when multiple parts of your app need safe concurrent access to shared local data, requiring atomic file writes to prevent corruption that direct JSON storage cannot guarantee.

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