I'm coming from Tcl-world ...
Andreas.Leitgeb at siemens.at
Mon Aug 5 16:12:31 CEST 2002
Oren Tirosh <oren-py-l at hishome.net> wrote:
> The asyncore documentation could be better.
I had a look at help("asyncore"), and it gave me headache :-(
> If you have any ideas how to make it easier to use I'd love to hear them,
> whether they're tcl-inspired or not...
yes, and I think it would be quite easy (up to details) to do
it in Python: (the following is python-like, but pseudo-code)
The implementations are missing, and could be based on asyncore.
# register a channel for watching reads, writes or errors
# fd (a file-object or a numeric os-filedescriptor)
# cb (callback: a function object taking a few parameters
# defined later. Specifying Null here, will cancel
# a previously set up callback for that channel
# mode (what events to register for: readable,writable,error
# or more of them. If error is not registered for an fd
# at the time the internal select() returns one for the fd,
# then read- and/or write-callback will be called instead
# once and then the channel is automtically unregistered.)
# data (an arbitrary object, that will be passed to the
# callback as is)
reg=register # alias :-)
# if a timer is set, the internally called select is called with
# an appropriate timeout, to awake at the first requested timer
# after the callback returns, select is automatically called again,
# with the time left until the next waiting timer.
# unregister a channel:
unreg = lambda fd,mode,data=None: register(fd,None,mode,data)
# the main loop:
# calls select(), and when that finishes, calls all the
# registered callback-functions whose condition is met
# and/or all timer-callbacks. Exceptions thrown by callbacks
# are caught, and handled: (e.g. printed out, or some
# registered exception-handler called)
# If there is no timer and no registered fileevent left,
# or on some other condition (yet to be defined - perhaps a
# special exception, as in asyncore), loop() finishes.
So much for the basic interface.
allow identifying & cancelling of timers
Some of the suggested features even go beyond Tcl's current
PS: this was a brainstorming, not yet a thought-out design.
Newsflash: Sproingy made it to the ground !
read more ... <http://avl.enemy.org/sproingy/>
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