"""Example of the Observer pattern using Pyro. Copyright 2010 Allen B. Downey License: GNU GPLv3 http://www.gnu.org/licenses/gpl.html """ import Pyro.errors from remote_object import NameServer class Modifier: """A Modifier is an object that reads and writes the state of a Subject, but it is not a registered Observer.""" def __init__(self, subject_name): self.subject = ns.get_proxy(subject_name) def modify(self): """Increment the state of the Subject.""" state = self.subject.get_state() self.subject.set_state(state+1) print 'Set state ' + str(state+1) ns = NameServer() subject_name = 'simple_subject' mod = Modifier(subject_name) mod.modify()