[Django] #24402: Missing support for rollback in django.core.cache
Django
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Reporter: Tuttle | Owner: nobody
Type: New feature | Status: new
Component: Core (Cache system) | Version:
Severity: Normal | Keywords:
Triage Stage: Unreviewed | Has patch: 0
Easy pickings: 0 | UI/UX: 0
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Tried unsuccessfully to find existing ticket for this, so starting an idea
discussion.
In my project, I use `memcached` via `django.core.cache` to cache data
resulting from some ORM operations. But when the database rolls back, the
memcache is kept in the wrong state.
Currently I'm adding another layer with local dict (which has some speed
improvements effects):
{{{#!python
class DeferredMemcache(object):
def __init__(self):
from django.core import cache # Importing this way so
debug_toolbar can patch it later.
self.real_cache = cache.cache
self.local_cache = {}
def get(self, key, default=None):
try:
value, deadline = self.local_cache[key]
except KeyError:
return self.real_cache.get(key, default)
else:
return value if deadline > time.time() else default
def set(self, key, value, timeout):
assert timeout > 0
self.local_cache[key] = value, timeout + time.time()
def commit(self):
for key, (value, deadline) in self.local_cache.iteritems():
timeout = deadline - time.time()
if timeout >= 0:
self.real_cache.set(key, value, timeout)
self.local_cache.clear()
}}}
What do you think about adding some support for cache rollback in Django?
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Ticket URL: <https://code.djangoproject.com/ticket/24402>
Django <https://code.djangoproject.com/>
The Web framework for perfectionists with deadlines.
Django
Reporter: Tuttle | Owner: nobody
Type: New feature | Status: new
Component: Core (Cache system) | Version:
Keywords: | Triage Stage:
| Unreviewed
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
Changes (by timgraham):
* needs_better_patch: => 0
* needs_tests: => 0
* needs_docs: => 0
Comment:
Could you please open a discussion on the DevelopersMailingList to get
feedback on the idea?
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Ticket URL: <https://code.djangoproject.com/ticket/24402#comment:1>
Django
Reporter: Tuttle | Owner: nobody
Type: New feature | Status: new
Component: Core (Cache system) | Version:
Keywords: | Triage Stage:
| Unreviewed
Has patch: 0 | Needs documentation: 0
Easy pickings: 0 | UI/UX: 0
Comment (by aaugustin):
I believe this is a duplicate of #21803.
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Ticket URL: <https://code.djangoproject.com/ticket/24402#comment:2>
Django
Reporter: Tuttle | Owner: nobody
Type: New feature | Status: closed
Component: Core (Cache system) | Version:
Keywords: | Triage Stage:
| Unreviewed
Has patch: 0 | Needs documentation: 0
Easy pickings: 0 | UI/UX: 0
Changes (by timgraham):
* status: new => closed
* resolution: => duplicate
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Ticket URL: <https://code.djangoproject.com/ticket/24402#comment:3>