| |
| """ |
| A module for externalized finalizers. |
| """ |
| |
| import weakref |
| |
| garbageKey = 0 |
| |
| def callbackFactory(num, fins): |
| def _cb(w): |
| del refs[num] |
| for fx in fins: |
| fx() |
| return _cb |
| |
| refs = {} |
| |
| def register(inst): |
| global garbageKey |
| garbageKey += 1 |
| r = weakref.ref(inst, callbackFactory(garbageKey, inst.__finalizers__())) |
| refs[garbageKey] = r |
| |
| if __name__ == '__main__': |
| def fin(): |
| print 'I am _so_ dead.' |
| |
| class Finalizeable: |
| """ |
| An un-sucky __del__ |
| """ |
| |
| def __finalizers__(self): |
| """ |
| I'm going away. |
| """ |
| return [fin] |
| |
| f = Finalizeable() |
| f.f2 = f |
| register(f) |
| del f |
| import gc |
| gc.collect() |
| print 'deled' |
