//

// Utils.swift

// SYNQueue

//

import Foundation

func runInBackgroundAfter(seconds: NSTimeInterval, callback:dispatch_block_t) {

let delta = dispatch_time(DISPATCH_TIME_NOW, Int64(seconds) * Int64(NSEC_PER_SEC))

dispatch_after(delta, dispatch_get_global_queue(QOS_CLASS_BACKGROUND, 0), callback)

}

func synced(lock: AnyObject, closure: () -> ()) {

objc_sync_enter(lock)

closure()

objc_sync_exit(lock)

}

func runOnMainThread(callback:dispatch_block_t) {

dispatch_async(dispatch_get_main_queue(), callback)

}

func toJSON(obj: AnyObject) throws -> String? {

let json = try NSJSONSerialization.dataWithJSONObject(obj, options: [])

return NSString(data: json, encoding: NSUTF8StringEncoding) as String?

}

func fromJSON(str: String) throws -> AnyObject? {

if let json = str.dataUsingEncoding(NSUTF8StringEncoding, allowLossyConversion: false) {

let obj: AnyObject = try NSJSONSerialization.JSONObjectWithData(json, options: .AllowFragments)

return obj

}

return nil

}