[Twisted-Python] Asynchronicity

[Simon Pickles]

Wow! it works... iterate does indeed return. Must've had a small mistake
before!

I am amazed I solved my own problem for a change!

Thanks for the advice, Jean

Simon Pickles wrote:
>Integrating into a GUI is just one example. In my case, I am using
>Tkinter on win32. The GUI will be switched off when the server is
>running, its simply a debug controller...
>
>I'm more interested in how a twisted server manages to perform any other
>logic. For a game server, a fair amount of time needs to be devoted to
>object and memory management, AI, database access etc
>
>My first server, in C++ could do this simply, with a winSock thread
>listening and storing incoming network comms in a message queue. Easily
>integrated into a game loop.
>
>I was tempted to move to python due to the ease of modification.
>
>So... with twisted, how can I manage to spend any time doing AI, for
>instance?
>
>I thought twisted.interface.reactor.iterate() might be my answer. API
>docs say about iterate:
>
>"Run the main loop's I/O polling function for a period of time. This is
>most useful in applications where the UI is being drawn "as fast as
>possible", such as games."
>
>Unfortunately, the next sentence seems a little contradictory....
>
>" The reactor must have been started (via the run() method) prior to any
>invocations of this method. It must also be stopped manually after the
>last call to this method (via the stop() method). "
>
>Now, I am only a beginner at twisted, but it looks to me if I called
>run(), I won't have a chance to call iterate() cos twisted will have
>gone into its mainloop and stolen all control!
>
>Am i making sense?
>
>Regards
>
>Simon
>
>
>Jean-Paul Calderone wrote:
>>On Sat, 09 Jun 2007 16:09:29 +0100, Simon Pickles <sipickles at hotmail.com> 
>>wrote:
>>>Hi,
>>>
>>>I have managed to get a simple server going. It seems to accept multiple
>>>connections correctly.
>>>
>>>I am a little puzzled as to how to achieve an asynchonous application
>>>using twisted. Twisted itself seems asynchronous, but my code is blocked
>>>by the call:
>>>
>>>reactor.run()
>>>
>>
>>Quite so.  reactor.run enters the Twisted mainloop and does not return
>>until the mainloop is stopped (via reactor.stop).
>>
>>>Is there anyway I can return from the reactor to run other code, like
>>>GUI stuff, or other processing?
>>
>>No, but you can call into your other code from Twisted event handlers or
>>you can write a custom reactor which integrates an existing mainloop with
>>Twisted's.  As far as GUIs go, Twisted already includes reactors which
>>integrate glib, gtk, gtk2, various kinds of Windows loops, wxPython, and
>>a few others.
>>
>>Precisely how you integrate two mainloops depends on various details
>>about the loops in question.  Which GUI library are you trying to
>>integrate with?
>>
>>Jean-Paul
>>
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>>
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