def get_cached_object(model, **kwargs):
"""
Return a cached object. If the object does not exist in the cache, create it
and register it for invalidation if the object is updated (check via _get_pk_val().
Params:
model - Model class ContentType instance representing the model's class
**kwargs - lookup parameters for content_type.get_object_for_this_type and for key creation
Throws:
model.DoesNotExist is propagated from content_type.get_object_for_this_type
"""
if isinstance(model, ContentType):
model = model.model_class()
key = _get_key(KEY_FORMAT_OBJECT, model, kwargs)
obj = cache.get(key)
if obj is None:
obj = model._default_manager.get(**kwargs)
cache.set(key, obj, CACHE_TIMEOUT)
CACHE_DELETER.register_pk(obj, key)
return obj
def get_cached_list(model, *args, **kwargs):
"""
Return a cached list. If the list does not exist in the cache, create it
and register it for invalidation if any object from the list is updated (check via _get_pk_val()).
Params:
model - Model class ContentType instance representing the model's class
**kwargs - lookup parameters for content_type.get_object_for_this_type and for key creation
"""
if isinstance(model, ContentType):
model = model.model_class()
key = _get_key(KEY_FORMAT_LIST, model, kwargs)
l = cache.get(key)
if l is None:
log.debug('get_cached_list(model=%s), object not cached.' % str(model))
l = list(model._default_manager.filter(*args, **kwargs))
cache.set(key, l, CACHE_TIMEOUT)
for o in l:
CACHE_DELETER.register_pk(o, key)
#CACHE_DELETER.register_test(model, lambda x: model._default_manager.filter(**kwargs).filter(pk=x._get_pk_val()) == 1, key)
return l
def invalidate_cache(key, template_name, template_dirs=None):
from ella.db_templates.models import DbTemplate
if DbTemplate._meta.installed:
CACHE_DELETER.register_test(DbTemplate, "name:%s" % template_name, key)