Mate（四）——扩展

扩展mate现有的标签

1.      创建class extends AbstractServiceInvoker implements IAction. 实现IAction才能放入 EventHandlers中，AbstractServiceInvoker提供了result和fault的处理

2.      构造函数

设置 currentInstance指向this

3.      重写run函数

为result和fault创建 inner handlers

override protected function run(scope:IScope):void {// specify that the dispatcher of the result and error event is the weatherService object          innerHandlersDispatcher = weatherService;            if (this.resultHandlers && resultHandlers.length > 0){                this.createInnerHandlers(scope, WeatherResultEvent.WEATHER_LOADED, resultHandlers);            }            if (this.faultHandlers && faultHandlers.length > 0){                this.createInnerHandlers(scope, WeatherErrorEvent.INVALID_LOCATION , faultHandlers);            }            weatherService.getWeather(location, unit);}

 

4.      使用tag

 <extensions:WeatherLoader> <!-- make the call to the service -->      <Properties location="{event.location}" unit="{event.unit}" />            <extensions:resultHandlers>            <!-- receive the results contained in the currentEvent.data property (

             WeatherResultEvent contains a data property) -->      <MethodInvoker generator="{WeatherManager}" method="setWeather" 

          arguments="{currentEvent.data}" />     </extensions:resultHandlers>