//
//  ViewController.swift
//  multiprocess
//
//  Created by Alexander Kolov on 30.1.15.
//  Copyright (c) 2015 Alexander Kolov. All rights reserved.
//

import UIKit

class ViewController: UIViewController {

  @IBOutlet weak var button: UIButton!

  var lockQueue = dispatch_queue_create("lockQueue", nil)

  lazy var queue: NSOperationQueue = {
    let queue = NSOperationQueue()
    queue.maxConcurrentOperationCount = 10
    return queue
  }()

  lazy var memory: [[String]] = {
    var memory = [[String]]()
    return memory
  }()

  override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.
  }

  override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
  }

  @IBAction func didTapButton(sender: UIButton) {

    var operations = [NSBlockOperation]()

    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0)) {
      for i in 0...10 {
        let operation = NSBlockOperation() {
          var arr = [String]()

          for a in UnicodeScalar("a").value...UnicodeScalar("z").value {
            arr.append(String(format: "%c", a))
          }

          dispatch_sync(self.lockQueue) {
            self.memory.append(arr)
          }
        }

        operations.append(operation)
      }

      self.queue.addOperations(operations, waitUntilFinished: true)
      println("\(self.memory)")
    }
  }

}