ServiceMonitor  - AS3

     // JavaScript Constructor function
     function MyHTTPMonitor(url, method)
     {
         // "that" variable makes "this" available in closures below
         var that = this;
         // Required initialization of the service monitor, returns the actual ServiceMonitor object.
         this.monitor = this.initServiceMonitor();
         // Initializes URLStream and event handlers.
         this._urlStream = new air.URLStream();
         this._urlRequest = new air.URLRequest(url);
         if (method)
         {
             this._urlRequest.method = method;
         }
         else
         {
             this._urlRequest.method = "GET";
         }
         function onStatus(event) {
             that.monitor.available = Number(event.status) == 200;
             that._urlStream.close();
         }
         function onError(event)
         {
             that.monitor.available = false;
             that._urlStream.close();
         }
         this._urlStream.addEventListener(air.HTTPStatusEvent.HTTP_RESPONSE_STATUS, onStatus);
         this._urlStream.addEventListener(air.SecurityErrorEvent.SECURITY_ERROR, onError);
         this._urlStream.addEventListener(air.IOErrorEvent.IO_ERROR, onError);
     }
     
     // Augment JavaScript prototype with public methods from ServiceMonitor
     air.ServiceMonitor.makeJavascriptSubclass(MyHTTPMonitor);
     
     // Implement specializer functions, just as you would when subclassing a JavaScript class
     MyHTTPMonitor.prototype.checkStatus = function()
     {
         air.trace('OVERRIDDEN checkStatus!', this);
         this._urlStream.load(this._urlRequest);
     }
     

     var httpMon = new MyHTTPMonitor('http://www.adobe.com')