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"""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()