ActionScript Worker Demo

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本文介绍了一个简单的ActionScript 3 (AS3) 多线程应用示例，通过创建Worker实例实现跨线程通信，包括消息发送与接收的过程。主程序与工作线程之间通过MessageChannel进行数据交换。

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一直以来都期盼as3什么时候能够支持多线程，现在终于来了，特写了一个小demo，照搬别人的，helloworld级的，羞愧，····

001
package

002
{

003
    import flash.display.Sprite;

004
    import flash.events.Event;

005
    import flash.system.MessageChannel;

006
    import flash.system.Worker;

007
    import flash.system.WorkerDomain;

008
    import flash.utils.setInterval;

009
 
010
    public class WorkerTest extends Sprite

011
    {

012
        protected var mainToWorker:MessageChannel;

013
        protected var workerToMain:MessageChannel;

014
        protected var worker:Worker;

015
 
016
        public function WorkerTest()

017
        {

018
            this.addEventListener(Event.ADDED_TO_STAGE,
 onAddedToStage);

019
        }

020
 
021
        private function onAddedToStage(e:Event)
 : void

022
        {

023
            this.removeEventListener(Event.ADDED_TO_STAGE,
 onAddedToStage);

024
 
025
            init();

026
        }

027
 
028
        private function init()
 : void

029
        {

030
            if (Worker.current.isPrimordial)

031
            {

032
                worker
 = WorkerDomain.current.createWorker(this.loaderInfo.bytes);

033
 
034
                mainToWorker
 = Worker.current.createMessageChannel(worker);

035
                workerToMain
 = worker.createMessageChannel(Worker.current);

036
 
037
                worker.setSharedProperty("mainToWorker",
 mainToWorker);

038
                worker.setSharedProperty("workerToMain",
 workerToMain);

039
 
040
                workerToMain.addEventListener(Event.CHANNEL_MESSAGE,
 onWorkerToMain);

041
 
042
                worker.start();

043
 
044
                setInterval(

045
                    function ()
 : void

046
                    {

047
                        //helloworld();

048
                        count();

049
                    },

050
                    2000

051
                );

052
            }

053
            else

054
            {

055
                mainToWorker
 = Worker.current.getSharedProperty("mainToWorker");

056
                workerToMain
 = Worker.current.getSharedProperty("workerToMain");

057
 
058
                mainToWorker.addEventListener(Event.CHANNEL_MESSAGE,
 onMainToWorker);

059
            }

060
        }

061
 
062
        protected function helloworld()
 : void

063
        {

064
            mainToWorker.send("HELLO");

065
            trace("[Main]
 HELLO ");

066
        }

067
 
068
        protected function count()
 : void

069
        {

070
            mainToWorker.send("ADD");

071
            mainToWorker.send(2);

072
            mainToWorker.send(5);

073
 
074
            trace("[Main]
 ADD 2 + 5 ?");

075
        }

076
 
077
        protected function onMainToWorker(e:Event)
 : void

078
        {

079
            var msg:*
 = mainToWorker.receive();

080
 
081
            switch (msg)

082
            {

083
                case "HELLO":

084
                    workerToMain.send("WORLD");

085
                    break;

086
                case "ADD":

087
                    var a:int =
 mainToWorker.receive();

088
                    var b:int =
 mainToWorker.receive();

089
 
090
                    workerToMain.send(a
 + b);

091
                    break;

092
            }

093
        }

094
 
095
        protected function onWorkerToMain(e:Event)
 : void

096
        {

097
            trace("[Worker]
 " +
 workerToMain.receive());

098
        }

099
    }

100
}