34 lines
698 B
Swift
34 lines
698 B
Swift
//
|
||
// DatabaseID.swift
|
||
// Data
|
||
//
|
||
// Created by Brent Simmons on 7/15/17.
|
||
// Copyright © 2017 Ranchero Software. All rights reserved.
|
||
//
|
||
|
||
import Foundation
|
||
import RSCore
|
||
|
||
// MD5 works because:
|
||
// * It’s fast
|
||
// * Collisions aren’t going to happen with feed data
|
||
|
||
private var databaseIDCache = [String: String]()
|
||
private var databaseIDCacheLock = os_unfair_lock_s()
|
||
|
||
func databaseIDWithString(_ s: String) -> String {
|
||
|
||
os_unfair_lock_lock(&databaseIDCacheLock)
|
||
defer {
|
||
os_unfair_lock_unlock(&databaseIDCacheLock)
|
||
}
|
||
|
||
if let identifier = databaseIDCache[s] {
|
||
return identifier
|
||
}
|
||
|
||
let identifier = (s as NSString).rs_md5Hash()
|
||
databaseIDCache[s] = identifier
|
||
return identifier
|
||
}
|