Responder
A Responder is simple class encapsulating the handling of a
Remote (asynchronous) call and its result and/or fault.
A Responder class will implement the mx.rpc.IResponder interface.
A Responder object has two important methods:
- result() - function receives a ResultEvent
- fault() - function receives a FaultEvent
AsyncToken and Responders
Responders are usually used with AsyncTokens for asynchronous call handling.
AsyncResponder (mx.rpc.AsyncResponder)
AsyncResponder is a convenient implementation of the IResponder interface
in the mx.rpc package.
The AsyncResponder constructor takes two arguments, both of them functions:
a result handler and a fault handler.
Create an AsyncResponder instance:
// call the HTTP Service's send() to invoke the request, a token is returned var token:AsyncToken = http.send(); // setup responder (resultHandler and faultHandler functions) and add to token var responder:AsyncResponder = new AsyncResponder( resultHandler, faultHandler ); token.addResponder( responder );
The resultHandler and faultHandler arguments passed into the constructor above are both functions with the following signatures:
public function resultHandler( event:ResultEvent, token:Object=null ):void { Alert.show( "RESULT: "+ event.result as String ); } public function faultHandler( event:FaultEvent, token:Object=null ):void { Alert.show( "FAULT: " + event.fault.message ); }
Both the result and fault handler methods of an AsyncResponder accepts two arguments: the event and the token.