async-threading让Flex支持多线程

开源项目async-threading能使as3支持多线程。

要在Flex4 sdk环境下使用，要先修改一下源代码，打开com.symantec.premiumServices.asyncThreading.handlers.FPSObserverHandler：

• 将import mx.core.Application;修改为import spark.components.Application;
• 将private var _appRef:Application = Application.applicationas Application;修改为private var _appRef:Application = FlexGlobals.topLevelApplication as Application;
• 同时导入import mx.core.FlexGlobals;

这个api要求自定义的线程继承AbstractAsyncThread然后实现IAsyncThreadResponder接口，写一个测试用线程：

package thread  
{  
    import com.symantec.premiumServices.asyncThreading.abstract.AbstractAsyncThread;  
    import com.symantec.premiumServices.asyncThreading.interfaces.IAsyncThreadResponder;  
      
    /** 
     *  自定义线程  
     */  
    public class SelfDefinedThread extends AbstractAsyncThread implements IAsyncThreadResponder  
    {  
        private var f:Function;  
          
        public function SelfDefinedThread(f:Function)  
        {  
            super();  
            this.f = f;  
        }  
          
        public function execute():void  
        {  
            f.call();  
        }  
    }  
}

这个api还是比较强大的，基本线程操作和通讯都能实现了，具体可以看附件内的源代码api。

这个线程的构造函数要传入一个方法，这个方法将在线程启动后调用。测试代码：

<?xml version="1.0" encoding="utf-8"?>  
<s:WindowedApplication xmlns:fx="http://ns.adobe.com/mxml/2009"   
                       xmlns:s="library://ns.adobe.com/flex/spark"   
                       xmlns:mx="library://ns.adobe.com/flex/mx"  
                       creationComplete="testThread()">  
    <fx:Declarations>  
        <!-- 将非可视元素（例如服务、值对象）放在此处 -->  
    </fx:Declarations>  
      
    <fx:Script>  
        <![CDATA[  
            import thread.SelfDefinedThread;  
              
            private function testThread():void{  
                //线程1  
                var thread1:SelfDefinedThread = new SelfDefinedThread(  
                    function():void{  
                        trace("线程1执行");  
                        trace("开启线程2");  
                        thread2.start();  
                    });  
                  
                //线程2  
                var thread2:SelfDefinedThread = new SelfDefinedThread(  
                    function():void{  
                        trace("线程2执行");  
                        if(thread1.sleeping)  
                        {  
                            thread1.kill();  
                            thread2.kill();  
                            thread3.kill();  
                            trace("线程1,2,3终止");  
                        }else{  
                            trace("开启一个线程3");  
                            thread3.start();  
                        }     
                    });  
                  
                //线程3  
                var thread3:SelfDefinedThread = new SelfDefinedThread(  
                    function():void{  
                        trace(thread3.id + "线程3执行");  
                        if(!thread1.sleeping)  
                        {  
                            thread1.sleep();  
                            trace("线程1休眠");  
                        }  
                    });  
                thread1.priority = thread1.RUN_LEVEL_HIGH;  
                thread2.priority = thread2.RUN_LEVEL_BELOW_NORMAL;  
                thread1.start();  
            }  
              
        ]]>  
    </fx:Script>  
    <s:Label x="281" y="122" text="多线程测试"/>  
</s:WindowedApplication>

用调试模式执行就能看到结果：

源代码下载：[MultiThreadingApp.rar] [MultiThreadTest.rar]