[Twisted-Python] Looking for a simple file event driven loop using Twisted

[steven howe]

Hello,
I'm looking for some example code I can use to build an app from. I
need to 'wait' or sleep for new data in a file. Then wake and process
the data.

The file is a regular file, not a pipe. It is the output of a existing
program (i.e., not mine to modify). Needless to say, the API for hugh.
I'm need some help finding the right tools.

Thanks, 

Steven Howe