The directory watcher operates by scanning a directory at some interval
and generating a list of files based on a user-supplied glob pattern.
As the file list changes from one interval to the next, events are
generated and dispatched to registered observers.  Three types of
events are supported -- added, modified, and removed.

Homepage:
http://rubygems.org/gems/directory_watcher/ http://gems.rubyforge.org/gems/directory_watcher/
