[Twisted-Python] Twisted's cfreactor + PyObjC = Asynchronous Networking on OS X
bob at redivi.com
Mon Oct 13 18:25:39 EDT 2003
For those of you who don't watch Twisted CVS, cfreactor is officially
out of the sandbox. cfreactor is the CoreFoundation integration
reactor for Twisted ( http://www.twistedmatrix.com/ ), which means that
you can now seamlessly integrate Cocoa and Twisted (without digging
around in my sandbox, that is).
If you're running OS X and you'd like to play with cfreactor, check out
the latest CVS and do a python setup.py install (so that it can build
twisted/internet/cfsupport.so -- ignore the warnings, they are expected
for Pyrex modules). There are two examples provided in
doc/examples/Cocoa. You will need PyObjC 1.0 (though it may work with
earlier betas, you should upgrade if you haven't yet) and MacPython 2.3
(not tested with Panther yet, but should work). The next release
version of Twisted, which is expected very shortly, will include this
new reactor and updated documentation. When it is released, it will
also be available from my Package Manager repository (
SimpleWebClient - Pretty much a straight port of
doc/examples/qtdemo.py, a very simple app that downloads HTML and puts
it in a text box.
WebServicesTool - A Twisted port of b.bum's XML-RPC demo (which is
included with PyObjC). For fun, compare how much simpler the Twisted
version is (since it doesn't need to deal with threads), and how much
more responsive it feels.
To run either demo, use the buildapp.py script provided in the same
folder as the application:
python buildapp.py build
Note that when using cfreactor you should *always* call reactor.run()
while the NSRunLoop is in action (best place to put it is probably in
your NSApplication delegate's applicationDidFinishLaunching_ method).
If you're using threads, make sure to only call into Twisted from the
main runLoop (which is where you have to do your drawing anyways). And
of course, you should cfreactor.install() before importing any other
Twisted modules (see the "Choosing a Reactor and GUI Toolkit
Integration" HOWTO for more information).
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