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swift-actor-persistence

Build actor-isolated Swift repositories with in-memory cache and JSON file persistence.

1|Updated Mar 6, 2026
Search Tags:#swift#persistence#offline-first#actors#thread-safety#codable#atomic writes
One-click install
npx skills add https://github.com/khetansarvesh/ai_skills_repo --skill swift-actor-persistence-khetansarvesh
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: swift-actor-persistence
Source: https://github.com/khetansarvesh/ai_skills_repo/tree/main/skills/swift-actor-persistence
Command: npx skills add https://github.com/khetansarvesh/ai_skills_repo --skill swift-actor-persistence-khetansarvesh

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

It eliminates data races and fragile lock-based persistence code by providing a thread-safe, actor-isolated repository that safely caches and persists Codable items.

Core Features & Use Cases

  • Actor-based repository for serialized access: Uses Swift actors to ensure all reads/writes to shared mutable state are compiler-enforced and race-free.
  • In-memory cache + file-backed storage: Loads items from disk into a dictionary for fast lookups, then atomically saves changes back to a JSON file.
  • Generic, reusable persistence layer: Works for any type that conforms to Codable and Identifiable, keyed by a String ID.
  • Use case: An offline-first iOS app that maintains a list of user questions locally, updates them from multiple async views/actions, and persists reliably across launches.

Quick Start

Use the swift-actor-persistence skill to implement an actor-based LocalRepository that caches Codable Identifiable models in memory and atomically persists them to a JSON 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 implement thread-safe persistence in Swift?▼

Thread-safe persistence in Swift is implemented using an actor-isolated repository that serializes reads and writes to an in-memory cache backed by a JSON file. This compiler-enforced isolation prevents data races without manual locks.

What's the best way to prevent data races in an offline-first iOS app?▼

Preventing data races in an offline-first app requires Swift actor isolation to serialize state access across concurrent async contexts. An actor-based repository safely manages shared mutable data and atomically persists changes to disk.

Can I use Swift actors for local JSON storage?▼

Yes, you can use Swift actors for local JSON storage by creating an actor-isolated repository. The actor loads Codable items into an in-memory dictionary and atomically writes updates back to the JSON file to prevent corruption.

Do I need Swift 5.5 to use actor-based persistence?▼

Yes, Swift 5.5+ is required to use actor-based persistence because actor isolation is a language feature introduced in that version. Your models must also conform to Codable and Identifiable.

How does atomic disk writing work with Codable models?▼

Atomic disk writing with Codable models works by serializing state access through a Swift actor and writing the cached dictionary to a JSON file in a single atomic operation. This ensures concurrent writes do not corrupt the persisted file.

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