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Revision 6637, 0.7 KB
(checked in by glyph, 7 years ago)
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Object database for Twisted. This Checkin Sponsored by Divmod, LLC
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| 1 | |
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| 2 | """ |
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| 3 | A module for externalized finalizers. |
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| 4 | """ |
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| 5 | |
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| 6 | import weakref |
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| 7 | |
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| 8 | garbageKey = 0 |
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| 9 | |
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| 10 | def callbackFactory(num, fins): |
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| 11 | def _cb(w): |
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| 12 | del refs[num] |
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| 13 | for fx in fins: |
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| 14 | fx() |
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| 15 | return _cb |
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| 16 | |
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| 17 | refs = {} |
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| 18 | |
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| 19 | def register(inst): |
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| 20 | global garbageKey |
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| 21 | garbageKey += 1 |
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| 22 | r = weakref.ref(inst, callbackFactory(garbageKey, inst.__finalizers__())) |
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| 23 | refs[garbageKey] = r |
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| 24 | |
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| 25 | if __name__ == '__main__': |
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| 26 | def fin(): |
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| 27 | print 'I am _so_ dead.' |
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| 28 | |
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| 29 | class Finalizeable: |
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| 30 | """ |
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| 31 | An un-sucky __del__ |
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| 32 | """ |
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| 33 | |
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| 34 | def __finalizers__(self): |
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| 35 | """ |
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| 36 | I'm going away. |
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| 37 | """ |
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| 38 | return [fin] |
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| 39 | |
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| 40 | f = Finalizeable() |
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| 41 | f.f2 = f |
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| 42 | register(f) |
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| 43 | del f |
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| 44 | import gc |
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| 45 | gc.collect() |
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| 46 | print 'deled' |
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