the cairngorm framework, the actual work of getting the remoteObject and
making a request is inside a delegate. Consider, for example a
remoteObject service which returns a list of customers with the id:
"roCustList". Create a business delegate class called
'CustomerListDelegate' having this function:
public function CustomerListDelegate ( responder : Responder )
{
this.service = ServiceLocator.getInstance().getService("roCustList");
this.responder = responder;
}
the call is made here:
public function getCustList(): void
{
var call : Object = service.getCustList();
call.resultHandler = responder.onResult;
call.faultHandler = responder.onFault;
}
Obviously there is much more to creating a successful request/response to a
service call than this. You have to create a cairngorm event and dispatch
that event with is handled in a command class that places the result in a
model. I can send you a step-by-step bare bones example of all the
required steps if you think you might benefit. I don't mind admitting that
I found it a bit bewildering at first, but when you get the hang of it, it
is a great framework.
"Larry Liang" To: flexcoders@yahoogroups.com
<[EMAIL PROTECTED]> cc:
Sent by: Subject: [flexcoders] How to subclass a singleton class ----
flexcoders@yahoogroups.com cairngorm issue --- Please help!!
04/27/2006 12:36 AM
Please respond to
flexcoders
I'm new to Flex and have been spending a lot of time trying to figure
out how is part of cairngorm framework works. Please help.
Cairngorm uses singleton pattern to ensure that there is only one
instance of a class running for each app.
For example, the ServiceLocator class use a static method to return
the instance reference to you.
public static function getInstance() : ServiceLocator
{
if ( serviceLocator == null )
serviceLocator = new
ServiceLocator();
return serviceLocator;
}
The documentation said that the recommended way to use this class is
to subclass ServiceLocator and define your services, using the code
similar to the following:
<cairngorm:ServiceLocator xmlns:mx="http://www.macromedia.com/2003/
mxml" xmlns:cairngorm="org.nevis.cairngorm.business.*" >
<mx:RemoteObject id="customerDelegate" source="org.nevis.
cairngorm.samples.login.LoginDelegate"
result="event.call.resultHandler( event )"
fault="event.call.faultHandler( event )">
</mx:RemoteObject>
</cairngorm:ServiceLocator>
so far so good. however the documentation said Services can later be
located, usually in a business delegate class as shown here:
var service = ServiceLocator.getInstance().getService( "
customerDelegate" );
This is where I am confused. I just used mxml to subclass the
servicelocator class and add a new property (remoteobject) to the
instance of the subclass (not parent class). But when I use
ServiceLocator.getInstance("cusomerDelegate")
what I get is a reference to the parent class which is "ServiceLocator
" class defined by cairngorm. How can i use a reference to the parent
class to locate a property of the child class.
I'm very confused. This may have something to do with the way that
mxml script is compiled into actionscript object. Someone please give
me some ideas.
By the way, I tried to subclass the ServiceLocator class in
actionscript 2 and assign an service object to the subclass.
When I use
ServiceLocator.getInstance.getService('myService');
The program returned saying that the service can not be found. I
guess it kind of makes sense in that the object belongs to the
subclass not the parent class.
sorry for making this a bit long.
Thanks,
Larry
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