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Viewing changes to vendor/Twisted-10.0.0/twisted/python/finalize.py

  • Committer: Jesse Andrews
  • Date: 2010-05-28 06:05:26 UTC
  • Revision ID: git-v1:bf6e6e718cdc7488e2da87b21e258ccc065fe499
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vendor/Twisted-10.0.0/twisted/python/finalize.py
 
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"""
 
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A module for externalized finalizers.
 
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"""
 
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import weakref
 
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garbageKey = 0
 
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def callbackFactory(num, fins):
 
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    def _cb(w):
 
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        del refs[num]
 
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        for fx in fins:
 
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            fx()
 
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    return _cb
 
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refs = {}
 
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def register(inst):
 
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    global garbageKey
 
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    garbageKey += 1
 
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    r = weakref.ref(inst, callbackFactory(garbageKey, inst.__finalizers__()))
 
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    refs[garbageKey] = r
 
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if __name__ == '__main__':
 
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    def fin():
 
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        print 'I am _so_ dead.'
 
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    class Finalizeable:
 
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        """
 
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        An un-sucky __del__
 
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        """
 
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        def __finalizers__(self):
 
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            """
 
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            I'm going away.
 
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            """
 
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            return [fin]
 
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    f = Finalizeable()
 
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    f.f2 = f
 
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    register(f)
 
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    del f
 
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    import gc
 
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    gc.collect()
 
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    print 'deled'