Does Python have any kind of 'messaging'?

[j_mckitrick]

I used to like Objective-C and Gnustep, but I gave up for lack of
support and recognition of the language/platform under Unix. But it
did offer NSNotifications , a basic message class that could be posted
and received by all subscribers. Other than global variables used to
share data across threads, does Python have anything similar?

jonathon

[Josiah Carlson]

Re: Does Python have any kind of 'messaging'?

> I used to like Objective-C and Gnustep, but I gave up for lack of[color=blue]
> support and recognition of the language/platform under Unix. But it
> did offer NSNotifications , a basic message class that could be posted
> and received by all subscribers. Other than global variables used to
> share data across threads, does Python have anything similar?[/color]

No, but you can write one yourself quite easily, depending on the
semantics of your messaging system.

- Josiah


import threading

channels = {}
lock = threading.RLock ()

def subscribe(id, funct, channel):
lock.acquire()
if channel in channels:
channels[channel][id] = funct
else:
channels[channel] = {id:funct}
lock.release()

def unsubscribe(id, channel):
lock.acquire()
if channel in channels:
try:
del channels[channel][id]
except KeyError:
pass
lock.release()

def post(channel, message):
lock.acquire()
if channel in channels:
for funct in channels[channel].itervalues():
funct(message)
lock.release()