NetNewsWire/Frameworks/Articles/DatabaseID.swift

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//
// 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:
// * Its fast
// * Collisions arent going to happen with feed data
private var databaseIDCache = [String: String]()
private var databaseIDCacheLock = os_unfair_lock_s()
public 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
}