package
{
	import flash.display.Sprite;
	import flash.events.Event;
	import flash.system.MessageChannel;
	import flash.system.Worker;
	import flash.system.WorkerDomain;
	import flash.utils.setInterval;
	
	public class HelloWorldWorker extends Sprite
	{
		protected var mainToWorker:MessageChannel;
		protected var workerToMain:MessageChannel;
		
		protected var worker:Worker;
		
		public function HelloWorldWorker()
		{
			/** 
			 * Start Main thread
			 **/
			if(Worker.current.isPrimordial){
				//Create worker from our own loaderInfo.bytes
				worker = WorkerDomain.current.createWorker(this.loaderInfo.bytes);
				
				//Create messaging channels for 2-way messaging
				mainToWorker = Worker.current.createMessageChannel(worker);
				workerToMain = worker.createMessageChannel(Worker.current);
				
				//Inject messaging channels as a shared property
				worker.setSharedProperty("mainToWorker", mainToWorker);
				worker.setSharedProperty("workerToMain", workerToMain);
				
				//Listen to the response from our worker
				workerToMain.addEventListener(Event.CHANNEL_MESSAGE, onWorkerToMain);
				
				//Start worker (re-run document class)
				worker.start();
				
				
				//Set an interval that will ask the worker thread to do some math
				setInterval(function(){
					mainToWorker.send("ADD");
					mainToWorker.send(2);
					mainToWorker.send(2);
				}, 1000);
					
			} 
			/** 
			 * Start Worker thread 
			 **/
			else {
				
				//Inside of our worker, we can use static methods to 
				//access the shared messgaeChannel's
				mainToWorker = Worker.current.getSharedProperty("mainToWorker");
				workerToMain = Worker.current.getSharedProperty("workerToMain");
				//Listen for messages from the mian thread
				mainToWorker.addEventListener(Event.CHANNEL_MESSAGE, onMainToWorker);
			}
		}
				
		//Main >> Worker
		protected function onMainToWorker(event:Event):void {
			var msg:* = mainToWorker.receive();
			//When the main thread sends us HELLO, we'll send it back WORLD
			if(msg == "HELLO"){
				workerToMain.send("WORLD");
			}
			else if(msg == "ADD"){
				//Receive the 2 numbers and add them together
				var result:int = mainToWorker.receive() + mainToWorker.receive();
				//Return the result to the main thread
				workerToMain.send(result);
			}
		}
		
		//Worker >> Main
		protected function onWorkerToMain(event:Event):void {
			//Trace out whatever message the worker has sent us.
			trace("[Worker] " + workerToMain.receive());
		}
	}
}