[Zope-dev] The Application object

[Jeff K. Hoffman]

On Mon, 17 Jul 2000, Chris McDonough wrote:

> I'm not sure I understand.  What is AppSingleton?  What does the
> Instance() method do?

Sorry I wasn't clear enough. The Singleton is a design pattern from the
Gang of Four book that fits this situation well. It is a class that is 
meant to control access to the one and only instance of a global
variable. I was just using that as a frame of reference, though; Zope has
no such class for the Application object, or I wouldn't be writing this
message.

I just need some way of getting at the one and only Application object at
run-time. Something like:

  from Globals import app
  myOb = app.Control_Panel.Products.MyProduct.MyZClass('foo')
  ...

Given a reference to an object in the ZODB, I can do this via:

  app = self.getPhysicalRoot()
  myOb = app.Control_Panel.Products.MyProduct.MyZClass('foo')

But, this does not work from methods like __init__, or __setstate__, where
we do not have a physical location in the ZODB, yet.

I just need a reference to the app object. I know the answer has to be
simple, but I can't find it.

--Jeff

---
Jeff K. Hoffman                               704.849.0731 x108
Chief Technology Officer                      mailto:jeff.hoffman@goingv.com
Going Virtual, L.L.C.                         http://www.goingv.com/