想写一个好的队列加载器,没想到FLASH 自带的HASHMAP 实在太慢了

我们都知道在高数据量的时候, 用SHIFT来剔除对象, 或者用SPLICE 会很慢
因此我想写一个好的队列加载器,
但是没想到, HASHMAP如此之慢
唉 只能放弃这个思路了, 还不如简单的ARRAY的队列快
唉 杯具~~

package com
{
	import flash.display.Loader;
	import flash.display.LoaderInfo;
	import flash.display.Sprite;
	import flash.events.Event;
	import flash.events.IOErrorEvent;
	import flash.events.SecurityErrorEvent;
	import flash.net.URLRequest;
	import flash.utils.Dictionary;
	/**
	 * 队列加载器, 失败啊, 没想到HASHMAP, 如此之慢
	 * @author guwanyuan
	 * 
	 */	
	public class QueenLoader extends Sprite
	{
		/**
		 * 清理后的标记URL地址 
		 */		
		public static const CLEAR_URL:String = "";
		
		public function QueenLoader()
		{
			super();
			urlDic = new Dictionary();
		}
		
		public function addLoaderItem(url:String):void
		{
			var index:int = offset + loaderList.length + list.length;
			urlDic[url] = index;
			list.push(url);
			if(!isLoader)
				nextLoader();
		}
		
		public function deleteLoaderItem(url:String, cancel:Boolean = false):void
		{
			trace("delete", url)
			var index:int = urlDic[url];
			var idx:int = index - offset;
			var loaderlistLeng:int = loaderList.length;
			if(idx < loaderlistLeng)
			{
				var leng:int = loaderlistLeng - idx;
				loaderList[leng] = CLEAR_URL;
			}
			else
			{
				var listIndex:int = idx - loaderlistLeng;
				list[listIndex] = CLEAR_URL;
			}
		}
		
		private function startLoad(url:String):void
		{
			trace(url);
			isLoader = true;
			var loader:Loader = new Loader();
			loader.load(new URLRequest(url));
			loader.contentLoaderInfo.addEventListener(Event.COMPLETE, loaderComplete);
			loader.contentLoaderInfo.addEventListener(IOErrorEvent.IO_ERROR, onIoError);
			loader.contentLoaderInfo.addEventListener(SecurityErrorEvent.SECURITY_ERROR, onSecurityError);
		}
		
		private function onSecurityError(e:SecurityErrorEvent):void
		{
			isLoader = false;
			nextLoader();
		}
		
		private function onIoError(e:IOErrorEvent):void
		{
			isLoader = false;
			nextLoader();
		}
		
		private function loaderComplete(e:Event = null):void
		{
			if(e)
				LoaderInfo(e.target).removeEventListener(Event.COMPLETE, loaderComplete);
			isLoader = false;
			nextLoader();
		}
		
		private function nextLoader():void
		{
			var url:String = CLEAR_URL;
			while(url == CLEAR_URL)
			{
				reverseList();
				url = loaderList.pop();
				offset++;
			}
			if(url)
				startLoad(url);
		}
		
		private function reverseList():void
		{
			if(loaderList.length <= 0)
			{
				loaderList = list.reverse();
				list = [];
			}
		}
		
		private var currentIndex:int = 0;
		private var isLoader:Boolean = false;
		private var offset:int = 0;
		private var urlDic:Dictionary;
		private var list:Array = [];
		private var loaderList:Array = [];
	}
}