Loop Benchmar Test 3: Linked List vs. Event

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license : MIT License
modified : 2010-05-19 01:00:49

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package
{
    import com.bit101.components.HBox;
    import com.bit101.components.PushButton;
    
    import flash.display.Sprite;
    import flash.events.Event;
    import flash.text.TextField;
    
    [SWF(width="465", height="465", frameRate="30", backgroundColor="#FFFFFF")]
    
    public class WonderflApp extends Sprite
    {
        private var firstItem:Item;
        
        private var logTextField:TextField = new TextField();
        private static const R:uint = 500000;
        
        public function WonderflApp():void
        {
            logTextField.y = 20;
            logTextField.width = stage.stageWidth;
            logTextField.height = stage.stageHeight - logTextField.y;
            addChild(logTextField);
            
            var box:HBox = new HBox(this);
            box.spacing = 0;
            new PushButton(box, 0, 0, "Linked List", testLinked).width = 60;
            new PushButton(box, 0, 0, "Events", testEvents).width = 60;
        }
        
        private function log(message:String):void
        {
            logTextField.appendText(message + "\n");
            logTextField.scrollV = logTextField.maxScrollV;
        }
        
        private function measure(methodName:String):void
        {
            var method:Function = this[methodName];
            var t0:Date = new Date();
            method();
            var t:uint = new Date().time - t0.time;
            log(methodName + ": " + t + " ms.");
        }
        
        private function generateItems():void
        {
            if(firstItem)
                return;
            
            log("----- Generating items -----");
            var item:Item = new Item(this);
            var pItem:Item;
            pItem = firstItem = item;
            for(var i:uint = 1; i < R; i++)
            {
                item = new Item(this);
                pItem.next = item;
                pItem = item;
            }
        }
        
        private function testLinked(... rest):void
        {
            generateItems();
            log("--- Starting Linked List test --- (" + R +" iterations)");
            measure("testLinkedExe");
            log("");
        }
        
        public function testLinkedExe():void
        {
            var item:Item = firstItem;
            var count:uint;
            while(item)
            {
                //count++;
                item = item.next;
            }
        }
        
        private function testEvents(... rest):void
        {
            generateItems();
            log("--- Starting Events test --- (" + R +" iterations)");
            measure("testEventsExe");
            log("");
        }
        
        private function testEventsExe():void
        {
            var event:ItemEvent = new ItemEvent(ItemEvent.COUNT);
            dispatchEvent(event);
        }
    }
}

import flash.events.EventDispatcher;
import flash.events.Event;
    
class Item
{
    public var next:Item;
    
    public function Item(dispatcher:EventDispatcher)
    {
        dispatcher.addEventListener(ItemEvent.COUNT, count);
    }
    
    private function count(event:ItemEvent):void
    {
        //event.count++;
    }
}

class ItemEvent extends Event
{
    public static const COUNT:String = "ItemEventCOUNT";
    public static const FIND:String = "ItemEventFIND";
    
    public var count:uint = 0;
    
    public function ItemEvent(type:String, bubbles:Boolean=false, 
            cancelable:Boolean=false)
    {
        super(type, bubbles, cancelable);
    }
}

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