[Twisted-Python] Asynchronicity

[Simon Pickles]

Just to point out, iterate() does seem to run a loop of reactor, before
returning. No call to run() is required.

This is contrary to the API docs.

Why would iterate() be a dead end, jean?

Simon Pickles wrote:
>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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