[Twisted-Python] Events in Python

[Andy Fundinger]

Yeah, just keep a list of functions in your own code, no need to use twisted
for it and I've not seen twisted functions that really help.  something
like:

class event(object):
  def __init__(self):
    self.subscribers=[]
  def subscribe(self.f):
    self.subscribers.append(f)
  def invoke(self,*args,*kwargs):
    for function in subscribers:
      function(*args,**kwargs)

you can tweak that or whatever, but that's the basic pythonic way to do it
in my book(and in my code) a couple options to consider:
* in invoke, pass self to the function, I usually do that so I can have
functions that do whatever they do to the "event" subclass itself, as in a
clearOnFocus function attached to a text control which subclasses event,
whenever certain data is seen (type=focusEvent) clear the control.
* instead of storing functions store and .callback deffereds, of course
those can only be used once so change event.subscribe to event.wait for
clarity and reinitialize the list after invoke.

-Andy Fundinger

On Jan 30, 2008 3:15 PM, Simon Pickles <sipickles at hotmail.com> wrote:

> Hi,
>
> I have a stackless python app, using twisted in parts (.internet and
> .adbapi).
>
> I need a little help getting pythonic after years of c++ hell.
>
> I'd like to use a system of events and observers, like c++ boost.signal.
>
> I'd like to be able to subscribe multiple callbacks to a single function
> and cal them all using something like:
>
> event.invoke("some data to send with invocation")
>
> I'm thinking twisted callbacks do this:
>
>  def observe(self, f);
>      self.event.addcallback(f)
>
> Are there other ways?
>
> Thanks
>
> Si
>
> --
> Linux user #458601 - http://counter.li.org.
>
>
>
>
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