Swift caching library

Related tags

Cache macos swift ios tvos watchos carthage
Overview

Cache

Version Carthage compatible

A generic caching library for Swift. Cache depends on Foundation.

This is still very much a work in progress.

Usage

Cache provides a simple Cache protocol:

protocol Cache {
  associatedtype Element

  func get(key key: String, completion: (Element? -> Void))
  func set(key key: String, value: Element, completion: (() -> Void)?)
  func remove(key key: String, completion: (() -> Void)?)
  func removeAll(completion completion: (() -> Void)?)
}

There are two (well actually three, but we'll get there) provided caches:

  • MemoryCache — Backed by an NSCache
  • DiskCache — Backed by files on disk using NSFileManager

Using both of these is exactly the same interface.

MultiCache

There is a third cache provided called MultiCache. This combines caches.

let cache = MultiCache(caches: [memoryCache, diskCache])
cache.set(key: "foo", value: "bar")

This will write to all caches in parallel. When accessing the multi cache, it will go in order. In this example, it will try the memory cache and if there's a miss it will try the disk cache. If it were to find it in the disk cache, it will write it to all previous caches for faster future reads.

Thanks

Thanks to Caleb Davenport for unintentionally inspiring this and lots of help along the way.

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Comments
  • Argument syntax may need to be changed because of SE-0066

    Argument syntax may need to be changed because of SE-0066

    Swift Evolution 66 https://github.com/apple/swift-evolution/blob/master/proposals/0066-standardize-function-type-syntax.md will require arguments to be placed in parameters.

    There are parts that will need to be changed, and it's better to do it now, rather than later.

    e.g.

    func get(key key: String, completion: (Element? -> Void))

    should be

    func get(key key: String, completion: ((Element?) -> Void))

    Just putting this here for discussion, I'll take a stab at it if no one else wants to.

    opened by Abizern 3
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