Track is a thread safe cache write by Swift. Composed of DiskCache and MemoryCache which support LRU.

• Thread safe: Implement by dispatch_semaphore_t lock and DISPATCH_QUEUE_CONCURRENT. Cache methods are thread safe and no deadlock.

• LRU: Implement by linkedlist, it`s fast. You can manage a cache through functions to limit size, age of entries and memory usage to eliminate least recently used object.

• Support async and sync operation.

• Cache implement SequenceType Generator, support subscrip for ... in map flapmap filter...

Base use

Support Sync and Async Set, Get, RemoveObject, RemoveAll and Subscript.

let track = Cache.shareInstance
track.set(object: "object", forKey: "key")
track.object(forKey: "key")
track.removeObject(forKey: "key") { (cache, key, object) in }
track.removeAllObjects { (cache, key, object) in }
track["key"] = "object"
print(track["key"])

Other use

MemoryCache and DiskCache has feature of LRU, so they can eliminate least recently used object according countLimit, costLimit and ageLimit.

let diskcache = DiskCache.shareInstance
diskcache.countLimit = 20
diskcache.costLimit = 1024 * 10
let memorycache = MemoryCache.shareInstance
memorycache.trim(toAge: 1000) { (cache, key, object) in }
memorycache.trim(toCount: 10) { (cache, key, object) in }

New features: SequenceType Generator

Cache support thread safe for ... in map forEache...

let cache: Cache = Cache.shareInstance
for i in 1 ... 5 {
    cache.set(object: "\(i)", forKey: "\(i)")
}
for object in cache {
    print(object)
}

output: ("5", 5) ("4", 4) ("3", 3) ("2", 2) ("1", 1)

cache.forEach {
    print($0)
}

output: ("1", 1) ("2", 2) ("3", 3) ("4", 4) ("5", 5)

let values = cache.map { return $0 }
print(values)

output: [("5", 5), ("4", 4), ("3", 3), ("2", 2), ("1", 1)]

CocoaPods

Support Swift 5.0

pod 'Track', :git => 'https://github.com/maquannene/Track.git', :branch => 'master'

Manually

1. Download and drop /Track folder in your project.
2. Congratulations!

Thanks YYCache，PINCache very much. Some ideas from them.

Track is released under the MIT license.

如果来自天朝点击查看更多实现细节文章