[AS3]trace() 与 logging 的压力测试

trace() 其实很慢！以后再发布时，一定要注意去掉 trace() 与 mx.logging.Target。

源代码：

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="vertical"
 scriptTimeLimit="5"
 width="520" height="490">
 <mx:Script>
 <![CDATA[
 import mx.logging.ILogger;
 import mx.logging.Log;
 import mx.logging.targets.TraceTarget;
 
 private static const logger:ILogger = Log.getLogger("TraceTest");
 
 private static const NONE:String = "无 trace()";
 private static const TRACE:String = "有 trace()";
 private static const LOGGER:String = "logger.debug()"
 
 private var tt:TraceTarget;
 
 private function test(testCase:String):void {
  var loopCount:int = int(count_ns.value);
  var start:int, now:int;
  var i:int;
  output("@" + testCase);
  try {
   switch (testCase) {
    case NONE:
     start = getTimer();
     for (i = 0; i < loopCount; i++) {
      "abcdefghijklmnopqrstuvwxyz";
     }
     now = getTimer();
     break;
    case TRACE:
     start = getTimer();
     for (i = 0; i < loopCount; i++) {
      trace("abcdefghijklmnopqrstuvwxyz");
     }
     now = getTimer();
     break;
    case LOGGER:
     start = getTimer();
     for (i = 0; i < loopCount; i++) {
      logger.debug("abcdefghijklmnopqrstuvwxyz");
     }
     now = getTimer();
     break;
   }
  }
  catch (e:Error) {
   now = getTimer();
   output("  " + i + "次时弹出错误: " + e);
  }
  var time:int = now - start;
  output("  经过时间(ms): " + nf.format(time));
  output("  1秒中的循环次数: " + nf.format(i * 1000 / time));
  output("----------------------------------------");
 }
 
 private function updateTraceTarget():void {
  if (!tt) {
   tt = new TraceTarget();
   tt.includeDate = false;
   tt.includeTime = false;
   tt.includeLevel = true;
   tt.includeCategory = true;
  }
  
  if (traceTarget_ch.selected) {
   Log.addTarget(tt);
  } else {
   Log.removeTarget(tt);
  }
 }
 
 private function output(msg:String):void {
  output_ta.text += msg + "\n";
 }
 ]]>
 </mx:Script>
 
 <mx:NumberFormatter id="nf" precision="0" />
 <mx:Panel title="trace()与logger.debug()的压力测试"
  paddingTop="8" paddingRight="8" paddingBottom="8" paddingLeft="8">
  <mx:HBox>
   <mx:Label text="循环回数:" />
   <mx:NumericStepper id="count_ns" value="1000000" maximum="10000000" />
  </mx:HBox>
  <mx:HBox>
   <mx:Button label="{NONE}" click="test(NONE)" />
   <mx:Button label="{TRACE}" click="test(TRACE)" />
   <mx:Button label="{LOGGER}" click="test(LOGGER)" />
   <mx:CheckBox id="traceTarget_ch" label="添加TraceTarget" change="updateTraceTarget()"/>
  </mx:HBox>
  <mx:TextArea id="output_ta" width="400" height="300" />
  <mx:Label color="red" text="*Application.scriptTimeLimit设为了5秒。" />
 </mx:Panel>
</mx:Application>