[转]LocalConnecton的性能有关问题[慎用LocalConnection]

[转]LocalConnecton的性能问题[慎用LocalConnection]
http://www.cnblogs.com/zhaozhan/archive/2010/07/24/1784179.html

LocalConnection可以实现在两个SWF文件的通信，不过存在延时问题，延时的时间跟发送的数据量有关，如果只是做普通的通信到没有什么所谓，如果是利用LocalConnection做实时的数据推送就会出现很严重的延时问题。频繁进行send操作，一方面会使内存不断上升，并且消息的接收方的速度与消息的发生速度不同步，停止发送信息之后仍然可以接收到数据。
      下面通过一个简单的例子看LocalConnection的性能问题：
       发送方SWF，定时器每500毫秒发送一次数据。

  <?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 flash.net.LocalConnection;                 private var conn:LocalConnection;              private var SendNo:uint=0;              private var SendTimer:Timer;              public function Init():void{                 conn=new LocalConnection();                  conn.addEventListener(StatusEvent.STATUS, onStatus);                    SendTimer=new Timer(500);                 SendTimer.addEventListener(TimerEvent.TIMER,handlerSend);                  SendTimer.start();            }                public function handlerSend(event:TimerEvent):void              {                  SendNo++;                 var data:Array=new Array();                                  for(var i:uint=0;i<20000;i++)                  {                      data[i]="a";                  }                  trace(new Date()+" SendNo:",SendNo);                  conn.send("LocalConnectionTest", "testHandler",data.join(""));                  txtMessage.text=new Date()+",SendNo:"+SendNo+ "\n"+txtMessage.text;               }                     private function onStatus(event:StatusEvent):void {                  switch (event.level) {                      case "status":                          trace("send() OK.");                          break;                      case "error":                          trace("send() Fault");                         break;                  }            }             ]]>           </mx:Script>     <mx:Canvas width="400" height="300" borderColor="#333333" borderStyle="solid" borderThickness="1">          <mx:TextInput id="txtMessage" width="100%" height="100%"/>      </mx:Canvas>  </mx:Application>

  <?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 flash.net.LocalConnection;                 private var conn:LocalConnection;              private var receiveNo:uint=0;              public function Init():void{                  conn=new LocalConnection();                  conn.client=this;                  try{                      conn.connect("LocalConnectionTest");                  }                  catch(error:ArgumentError){                      trace("ArgumentError");                  }             }                 public function testHandler(msg:String):void{                 receiveNo++;                 lbInfo.text+=msg+"\n";                 trace(msg);                 trace(new Date()+",receiveNo:"+receiveNo);                txtMessage.text=new Date()+",receiveNo:"+receiveNo+ "\n"+txtMessage.text;              }          ]]>      </mx:Script>            <mx:Label id="lbInfo" visible="false"/>      <mx:Canvas width="400" height="300" borderColor="#333333" borderStyle="solid" borderThickness="1">          <mx:TextInput id="txtMessage" width="100%" height="100%"/>      </mx:Canvas>  </mx:Application>