[Twisted-Python] quick factory question

[Greg Fortune]

Factories produce instances of protocols, correct?  And if I've created a 
single instance of a factory, I shouldn't have to worry about the app 
spawning more factories for any reason, correct?  I ask because I am holding 
some global mutex info in my factory that changes the behavior of the 
protocol instances and if multiple factories were running at any given time, 
I could have some huge concurency problems...

On a related note, I've noticed that twisted uses naming similar to that of 
the Designs pattern books.  Anyone know of a good online resource for the 
design patterns covered by "the gang of four" (ie, the ones twisted appears 
to be using...)?

Thanks,

Greg