If I remember correctly, the original motivation for my version was that I encountered an issue with callbacks where they were methods of objects that could be deleted before the callback gets a chance to run, and the fact that holding a reference to the methods would prevent garbage collection (which also triggers signal/slot auto cleanup, etc). So I had come across some information about weakref callbacks. I made some modifications to some examples I had found. The result is that you can use bound methods as callbacks, and run your initial logic through a thread pool. Then the callback will be executed in the main thread, but can quietly fail if the owning object was deleted. And it won't hold a reference to the owning object.
On Thu, Mar 26, 2015 at 8:11 AM Justin Israel <[email protected]> wrote: > This looks kind of similar to something I did a while back > > https://gist.github.com/justinfx/6183367 > > We even both use the term "invoke" :-) > Mine uses a posted event to the main loop instead of signals and slots. > > On Thu, 26 Mar 2015 7:39 AM Marcus Ottosson <[email protected]> > wrote: > >> Hi all, >> >> I threw something together on a whim and would like your opinion of it. >> >> Inspired by JavaScript and it’s use of callbacks for IO-bound functions: >> >> expensiveFunction("argument", function(result) { >> console.log("The results are: " + result); >> }) >> >> I did this. >> >> def callback(result): >> print "The results are: %s" % result >> >> invoke(expensive_function, callback) >> >> Code here: >> https://gist.github.com/mottosso/c20df396f4ecc882b53c >> >> Question is, is there already a way of doing this? If not, what could be >> made better, faster, stronger? I’m calling it “invoke” but I’m sure there’s >> already an established term for it, do you know of any? >> >> Best, >> Marcus >> >> -- >> *Marcus Ottosson* >> [email protected] >> >> -- >> You received this message because you are subscribed to the Google Groups >> "Python Programming for Autodesk Maya" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> To view this discussion on the web visit https://groups.google.com/d/ >> msgid/python_inside_maya/CAFRtmOD6jDvWtY39eBEbQVU95HB2T >> 0wF89GHeXSAdHEnUn5yDA%40mail.gmail.com >> <https://groups.google.com/d/msgid/python_inside_maya/CAFRtmOD6jDvWtY39eBEbQVU95HB2T0wF89GHeXSAdHEnUn5yDA%40mail.gmail.com?utm_medium=email&utm_source=footer> >> . >> For more options, visit https://groups.google.com/d/optout. >> > -- You received this message because you are subscribed to the Google Groups "Python Programming for Autodesk Maya" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/python_inside_maya/CAPGFgA0Bg-sLMAzh6v55gg3VGcBaDdMg84h1GTt%3DuWEMM5aLcA%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
