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Created on 2002-05-13 00:22 by rhettinger, last changed 2022-04-10 16:05 by admin. This issue is now closed.
| Files | ||||
|---|---|---|---|---|
| File name | Uploaded | Description | Edit | |
| cache.dif | rhettinger, 2002-05-13 00:22 | Context diff for listobject.c and listobject.h | ||
| Messages (2) | |||
|---|---|---|---|
| msg40017 - (view) | Author: Raymond Hettinger (rhettinger) *  |
Date: 2002-05-13 00:22 | |
This patch is a proof-of-concept for marking state
changes in mutable objects. It is meant as a simpler,
faster alternative to a full built-in observer pattern.
Here's the whole protocol:
Mutable objects choosing to implement the protocol
provide a writable attribute, cachevalid, which is
initialized to zero. Upon any update to the object,
the attribute is reset to zero. Callers who set the
attribute to one can later check to see if an update
has occurred (as indicated by a zero).
>>> a = list('abcd')
>>> a.cachevalid
0
>>> a.cachevalid=1
>>> a.cachevalid
1
>>> a[2] = 'k'
>>> a.cachevalid
0
The proof-of-concept patch is implemented only for
lists. A production version would need to include
dictionaries.
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| msg40018 - (view) | Author: Martin v. Löwis (loewis) * |
Date: 2002-10-07 21:32 | |
Logged In: YES user_id=21627 Raymond, are you still interested in this approach? |
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| History | |||
|---|---|---|---|
| Date | User | Action | Args |
| 2022-04-10 16:05:19 | admin | set | github: 36596 |
| 2002-05-13 00:22:27 | rhettinger | create | |