[Zope] Detecting dropped client connection?

[Stuart Bishop]

Hi.

I have a method that generates a large database report (around 4MB).
It takes around 5 minutes to generate, but I can happily stream it
to the client using RESPONSE.write().

What I have noticed, however, is that if the client drops the connection,
my method just keeps processing oblivious wasting ram, cycles but most
importantly a Zope thread. Is there a call I can make for my code to 
check
if the connection is still valid, allowing it to die if nothing is
listening to it?

--
Stuart Bishop <zen@shangri-la.dropbear.id.au>