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swift-actor-persistence

Build a thread-safe actor-based persistence layer with JSON file storage.

1|Updated Mar 3, 2026
Search Tags:#thread safety#in-memory cache#offline first#local persistence#swift actors#json storage
One-click install
npx skills add https://github.com/samymity/bridge-ventures-backend --skill swift-actor-persistence-samymity
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: swift-actor-persistence
Source: https://github.com/samymity/bridge-ventures-backend/tree/main/.claude/skills/swift-actor-persistence
Command: npx skills add https://github.com/samymity/bridge-ventures-backend --skill swift-actor-persistence-samymity

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

It solves the problem of safely persisting shared mutable data in Swift apps without introducing data races or manual synchronization.

Core Features & Use Cases

  • Actor-based repository: Enforces serialized access to a cached in-memory store so concurrent reads/writes stay consistent by design.
  • In-memory cache + file-backed storage: Provides fast lookups while persisting changes atomically to a JSON file for durability.
  • Generic, reusable persistence layer: Works with any model that conforms to Codable and Identifiable, keyed by a String ID for consistent retrieval.
  • Use case: For offline-first iOS/macOS apps, persist user-created entities (e.g., notes, tasks, questions) locally and keep UI state synchronized through async actor calls.

Quick Start

Implement a LocalRepository for your Codable & Identifiable model and use await to load, save, and delete items while the actor automatically updates an atomic file.

Frequently Asked Questions about swift-actor-persistence

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

FAQPage Schema
How do I safely persist Swift data locally without race conditions?▼

To safely persist Swift data without race conditions, implement an actor-based repository that enforces serialized access to an in-memory cache and performs atomic JSON file writes for concurrent read and write scenarios.

How do Swift actors eliminate data races in local storage?▼

Swift actors eliminate data races in local storage by serializing access to a shared mutable state, ensuring that concurrent reads and writes to the in-memory dictionary cache remain consistent by design.

Can I use this actor-based persistence layer for offline-first iOS apps?▼

Yes, you can use this actor-based persistence layer for offline-first iOS and macOS apps to store user-created entities locally and keep UI state synchronized through asynchronous actor calls.

What's the best way to cache and save Codable models in Swift 5.5?▼

The best way to cache and save Codable models in Swift 5.5 is using a generic actor repository that provides fast in-memory dictionary lookups while atomically persisting changes to a JSON file on disk.

Do I need Core Data to build a thread-safe file-backed Swift repository?▼

No, you do not need Core Data to build a thread-safe file-backed Swift repository; you can achieve this by using Swift actors with JSON encoding and decoding for any Codable and Identifiable model.

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