Dispatch.swift

//  Created by Stanislav Feldman on 26/07/15.
//  Copyright (c) 2015 Stanislav Feldman. All rights reserved.


/**
Grand Central Dispatch wrapper.
You can run code in background or main thread.
Also you can run your code after some time.
*/
class dispatch
{
    class async
    {
        class func bg(block: dispatch_block_t) {
            dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_BACKGROUND, 0), block)
        }
        
        class func main(block: dispatch_block_t) {
            dispatch_async(dispatch_get_main_queue(), block)
        }
    }
    
    class sync
    {
        class func bg(block: dispatch_block_t) {
            dispatch_sync(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_BACKGROUND, 0), block)
        }
        
        class func main(block: dispatch_block_t) {
            if NSThread.isMainThread()  {
                block()
            }
            else {
                dispatch_sync(dispatch_get_main_queue(), block)
            }
        }
    }
    
    class after {
        class func bg(when: Double, block: dispatch_block_t) {
            dispatch_after(dispatch_time(DISPATCH_TIME_NOW, Int64(when*Double(NSEC_PER_SEC))), dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_BACKGROUND, 0)!, block)
        }
        
        class func main(when: Double, block: dispatch_block_t) {
            dispatch_after(dispatch_time(DISPATCH_TIME_NOW, Int64(when*Double(NSEC_PER_SEC))), dispatch_get_main_queue(), block)
        }
    }
}