I have a bug in my app that i have not been able to get around.
At runtime when i test a specific module that contains slightly
modified flex 2 controls I'm always getting a 'cannot reference null
object' error, related to DragManager.isDragging().
After attempting to sniff out the problem we assume it is that
"mx.managers::IDragManager" is never getting registered and therefore
the singleton call,
private static var impl:IDragManager = Singleton.getInstance
("mx.managers::IDragManager") as IDragManager; is failing.
We've found it difficult to fix since most of the related classes
contain the [ExcludeClass] metatag and we are looking for pointers on
how to get around this issue.
Thanks,
Bjorn
On 12/01/2007, at 8:52 AM, Alex Harui wrote:
You can register anytime before you need to ask for the singleton.
Since our managers get used early in startup, we register them as
early as possible. You might be able to wait longer, even as late
as creationComplete. In some apps, the popup manager is loaded in
a module that is loaded way after the app started.
We register interfaces instead of classes for version control. If
a module in an application requires an older version of the
framework, it will live in its own application domain and thus not
share the same singleton as the main app. What we promise is that
the interfaces will never change, and the interfaces are put in a
bootstrap app domain. Then when you ask for the singleton, you can
share it across app domains.
-Alex
From: [email protected]
[mailto:[EMAIL PROTECTED] On Behalf Of Michael Schmalle
Sent: Thursday, January 11, 2007 1:38 PM
To: [email protected]
Subject: [flexcomponents] Singleton :: Where to register with classMap
Hi,
I have managers I am implementing singletons with.
I am trying to stick to the singleton pattern. I see that yor
singletons are registered in the systemManager frame 2 handler.
I also see that you are not using registerInitCallbacks() anymore.
So the question is... Where do I put my line of code that registers
the implementation class with the Singleton class map?
IE you have
Singleton.registerClass("mx.managers::ICursorManager ", Class
(getDefinitionByName("mx.managers::CursorManagerImpl")));
I want
Singleton.registerClass("com.teotiGraphix.manager::IMoveManager",
Class(getDefinitionByName("com.teotiGraphix.manager::MoveMangerImpl
")));
Also, why do you use the interface name when registering the class,
is that so others can override you implementation? (with the same
register call)... This is the first time I actually thought about
it this way. ;-)
Peace, Mike
PS I have been kind holding back on releasing components thus far
because I wanted my managers piped into this new algorithm.
--
Teoti Graphix
http://www.teotigraphix.com
Blog - Flex2Components
http://www.flex2components.com
You can find more by solving the problem then by 'asking the
question'.
