Flex actionscript, get data from AsyncToken call - actionscript-3

Question

I have Flex/Java project with blazeDS. Now I have an actionscript file that call a method of another actionscript that call the remoteObject (java class who make a simple select on db)
Here's the code:
Home.as
..
private var _dm:DataManager = new DataManager;
public function getPerson():void { // this is connect to a button in .mxml
_dm.getPerson();
}
..
DataManager.as
public class DataManager {
private var _service:RemoteObject;
private var _url:URLRequest;
private var loCs:ChannelSet = new ChannelSet();
public function DataManager () {
_service = new RemoteObject("PeopleDAO");
loCs.addChannel(new AMFChannel("canale", "http://localhost:8080/FlexTRYOUT/messagebroker/amf"));
_service.channelSet = loCs;
}
private function onFault(event:FaultEvent,token:Object):void {
var _fail:String = "fault";
}
private function onResult(event:ResultEvent,token:Object):void {
per = event.result as People; // is a bean class
Alert.show(per.nome);
}
public function getPerson():void {
var token:AsyncToken = _service.getPersona();
token.addResponder(new AsyncResponder(onResult,onFault));
}
}
The call works fine, it calls java method names getPerson() of the DataManger.java class. It return simply one object with name and surname (it's just a hello world to understand this damned AsyncCall). The problem is that I don't know how send this result to Home.as with a classic (java) return type. I have the result in onResult method and I don't know how to get it.
I try to follow Brian instructions and I just waste my time. Maybe because I'm not a flex actionscript programmer but I added the code Brian posted and:
public function getPerson():void { // this is connect to a button in .mxml
_dm.addEventListener(DATA_RECEIVED, onPersonFound); * compile error 1
_dm.getPerson();
}
error is DATA_RECEIVED is undefined
than in DataManager:
public class DataManager {
public static const DATA_RECEIVED:String = "DATA_RECEIVED";
...
private function onResult(event:ResultEvent,token:Object):void {
per = event.result as People; // is a bean class
dispatchEvent(new DataReceivedEvent(DATA_RECEIVED, per)); * compile error 2
}
}
error 2 is call of possible undefined method dispatchEvent
Where is the mistake? Please guys write the complete code because I'm on flex - actionscript - blazeds from two days and I have a few time to try solution. Thanks
OK, Sorry for all this post, I just create new one (but more elaborated and clear) with the same question. Step by Step I'm studing this language and I manage to implement the Brian code but DataManager.as class must extend EventDispatcher, if I don't extend this I have the compile error I posted. At moment I mangage to obtain the resultEvent data in the method defined in the addEventListener call (onPeopleFound in this case). Thanks a lot Brian I think I surely need your help again in future (at least until acceptance of the project). Bye

Answer 1

You can adjust method getPerson to have two parameters referencing the callback functions.
public function getPerson(onResultCallback:Function, onFaultCallback:Function):void {
var token:AsyncToken = _service.getPersona();
token.addResponder(new AsyncResponder(onResultCallback,onFaultCallback));
}
This way you can receive data in an instance of the class you need.

Answer 2

One option is to dispatch an event when you get the data back from the Java call:
Home.as
...
public function getPerson():void { // this is connect to a button in .mxml
_dm.addEventListener(DATA_RECEIVED, onPersonFound);
_dm.getPerson();
}
private function onPersonFound(dataEvent:DataReceivedEvent):void {
var person:People = dataEvent.people;
//Do important processing...
}
...
In DataManager.as
public class DataManager {
public static const DATA_RECEIVED:String = "DATA_RECEIVED";
...
private function onResult(event:ResultEvent,token:Object):void {
per = event.result as People; // is a bean class
dispatchEvent(new DataReceivedEvent(DATA_RECEIVED, per));
}
}
And DataReceivedEvent.as will look like the answer to How to dispatch an event with added data - AS3
public class DataReceivedEvent extends Event
{
public static const DATA_RECEIVED:String = "DATA_RECEIVED";
// this is the object you want to pass through your event.
public var result:Object;
public function DataReceivedEvent(type:String, result:Object, bubbles:Boolean=false, cancelable:Boolean=false)
{
super(type, bubbles, cancelable);
this.result = result;
}
// always create a clone() method for events in case you want to redispatch them.
public override function clone():Event
{
return new DataReceivedEvent(type, result, bubbles, cancelable);
}
}