Package	org.spicefactory.lib.task
Class	public class ResultTask
Inheritance	ResultTask Task flash.events.EventDispatcher
Subclasses	XmlLoaderTask

With the optional propertyName parameter of the constructor you can specify a property that will be set in the value of the data property. Since the data property of any Task is recursive (if it wasn't set for a particular Task it uses the value of its parent TaskGroup), you can use an object that was set as the data property on a containing TaskGroup to collect values of different ResultTasks. This way you don't have to keep references to all individual Tasks just to retrieve the result after the asynchronous operation is finished.

In the following example a simple value object will be used to collect the loaded text and XML of two loader tasks:

 public class LoaderResult {
 
     public var text:String;
     public var xml:XML;
     
 }
 
 var group:TaskGroup = new SequentialTaskGroup();
 group.data = new LoaderResult();
 group.addTask(new TextLoaderTask("test.txt", "text"));
 group.addTask(new XmlLoaderTask("test.xml", "xml"));
 group.addEventListener(TaskEvent.COMPLETE, onComplete);
 // error handling omitted
 group.start();
 
 private function onComplete (event:TaskEvent) : void {
     var t:Task = event.target as Task;
     var result:LoaderResult = t.data as LoaderResult;
     trace("loaded text: " result.text);
     trace("loaded XML: " result.xml);
 }
 

Note that the two loader tasks of the above example (TextLoaderTask and XmlLoaderTask) are not part of the Spicelib (yet). They are just used for illustration purposes. This example only works if the constructor of these two classes passes the second argument to the constructor of the superclass (ResultTask). Instead of a concrete class like LoaderResult in the example above you can also use a simple Dictionary as the data property.