package  {
	import flash.events.Event;
	import flash.utils.*;
	import flash.text.engine.EastAsianJustifier;
		
	public class Registry extends PollableBaseRegistry {
	
		private var subRegistries:Array;
		private var numRegistriesPolled:int;
		private var refreshRate:int;

		public function Registry(refreshRate:int) {
			this.subRegistries = [];
			this.numRegistriesPolled = 0;
			this.refreshRate = refreshRate;
			
			setInterval(this.poll, this.refreshRate);
		}
		
		public function addSubRegistry(subRegistry:IPollableRegistry, registryCallback:Function = null) {
			this.subRegistries.push(subRegistry);
			subRegistry.addEventListener(subRegistry.getUpdateEventType(), this.updated);
			subRegistry.addEventListener(subRegistry..getCycleCompleteEventType(), this.cycleComplete);
		}
		
		private function poll() {
			// This acts as a lock. After all the registries are polled, it resets to 0
			// so we know it's safe to poll again.
			if(this.numRegistriesPolled === 0) {
				for each(var subRegistry:Object in this.subRegistries) {
					this.numRegistriesPolled++;
					var fn:Function = subRegistry.getPollableFunction();
					fn();
				}
			}
		}
		
		private function updated(e:PollEvent) {
			trace(e.pollTarget.getLastUpdated());
		}
		
		private function cycleComplete(e:PollEvent) {
			if(this.numRegistriesPolled == this.subRegistries.length) {
				//trace("polling complete");
				this.numRegistriesPolled = 0;
			}
			
		}
	}
	
}