最近在网上看到一个工具类可以提供flex中多线程的支持，AsyncThreading，googleCode地址
，详细文档可以去googleCode上看
下面总结一下利用这个工具类来实现一个抽奖机的demo。
首先我们要编写一个自定义线程类，继承自AbstractAsyncThread并且实现IAsyncThreadResponder接口，
AbstractAsyncThread这个类可以控制线程的级别：
public const RUN_LEVEL_REAL_TIME : int = 1 ;
public const RUN_LEVEL_HIGH : int = 3 ;
public const RUN_LEVEL_ABOVE_NORMAL : int = 6 :
public const RUN_LEVEL_NORMAL : int = 8 ;
public const RUN_LEVEL_BELOW_NORMAL : int = 12 :
public const RUN_LEVEL_LOW : int = 24 ;
IAsyncThreadResponder这个接口提供了一个线程启动后调用的方法
自定义线程对象类代码如下：
package threads
{
import cn . ningyu . utils . Random ;
import com . symantec . premiumServices . asyncThreading . abstract . AbstractAsyncThread ;
import com . symantec . premiumServices . asyncThreading . interfaces . IAsyncThreadResponder ;
import mx . controls . Label ;
public class WorkBee extends AbstractAsyncThread implements IAsyncThreadResponder
{
private var _lab : Label ;
public function WorkBee ( lab : Label )
{
_lab = lab ;
super ();
super . priority = super . RUN_LEVEL_REAL_TIME ;
}
public function execute (): void
{
var random : Random = Random . getInstance ();
random . digit = 1 ;
random . radix = Random . NUMBER ;
_lab . text = random . createRandom ();
}
}
}
application中代码如下：
<? xml version = "1.0" encoding = "utf-8" ?>
<mx:Application xmlns:mx = "http://www.adobe.com/2006/mxml" layout = "absolute" creationComplete = "init()" >
<mx:Script>
<![CDATA[
import threads.WorkBee;
import com.symantec.premiumServices.asyncThreading.AsyncThreadingManager;
import mx.collections.ArrayCollection;
private var threadList:ArrayCollection = new ArrayCollection();
private function init():void {
threadList = new ArrayCollection();
for(var i:int=0;i<7;i++) {
var workBee:WorkBee;
switch(i) {
case 0:
workBee = new WorkBee(lab1);
break;
case 1:
workBee = new WorkBee(lab2);
break;
case 2:
workBee = new WorkBee(lab3);
break;
case 3:
workBee = new WorkBee(lab4);
break;
case 4:
workBee = new WorkBee(lab5);
break;
case 5:
workBee = new WorkBee(lab6);
break;
case 6:
workBee = new WorkBee(lab7);
workBee.wake()
break;
}
threadList.addItem(workBee);
}
}
private function onClick():void {
if(btn.label == "开始抽奖") {
for(var i:int=0;i<7;i++) {
if(threadList[i].sleeping) {
threadList[i].wake();
} else {
threadList[i].start();
}
}
btn.label = "停止抽奖";
} else if(btn.label == "停止抽奖") {
for(var i:int=0;i<7;i++) {
threadList[i].sleep();
}
btn.label = "开始抽奖";
}
}
]]>
</mx:Script>
<mx:FormItem verticalCenter = "0" horizontalCenter = "0" direction = "horizontal" fontSize = "50" fontWeight = "bold" >
<mx:Label id = "lab1" />
<mx:Label id = "lab2" />
<mx:Label id = "lab3" />
<mx:Label id = "lab4" />
<mx:Label id = "lab5" />
<mx:Label id = "lab6" />
<mx:Label id = "lab7" />
<mx:Button id = "btn" label = "开始抽奖" click = "onClick()" />
</mx:FormItem>
</mx:Application>
注意的点：
线程方法：start()启动线程
sleep()休眠线程
sleeping线程是否处在休眠状态
wake()重新激活线程
kill()杀掉线程
还提供AsyncThreadingManager来管理所有的进程
提供的方法：
shutDown()停掉所有的线程
killAllThreads()杀掉所有的线程
还支持线程之间通信，利用sendMessageToThreads(name:String,body:Object):Boolean