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First test with moving Attributes to m2m field. Not working yet.

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Griatch 2013-07-08 18:13:21 +02:00
parent a0a94df83d
commit a1d818f8aa
7 changed files with 169 additions and 143 deletions
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62
src/server/caches.py
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@ -141,26 +141,34 @@ def field_pre_save(sender, instance=None, update_fields=None, raw=False, **kwarg
# to any property).
#------------------------------------------------------------
# connected to post_init signal (connected in respective Attribute model)
def attr_post_init(sender, instance=None, **kwargs):
"Called when attribute is created or retrieved in connection with obj."
#print "attr_post_init:", instance, instance.db_obj, instance.db_key
hid = hashid(_GA(instance, "db_obj"), "-%s" % _GA(instance, "db_key"))
if hid:
global _ATTR_CACHE
_ATTR_CACHE[hid] = sender
#_ATTR_CACHE.set(hid, sender)
# connected to pre_delete signal (connected in respective Attribute model)
def attr_pre_delete(sender, instance=None, **kwargs):
"Called when attribute is deleted (del_attribute)"
#print "attr_pre_delete:", instance, instance.db_obj, instance.db_key
hid = hashid(_GA(instance, "db_obj"), "-%s" % _GA(instance, "db_key"))
if hid:
#print "attr_pre_delete:", _GA(instance, "db_key")
global _ATTR_CACHE
del _ATTR_CACHE[hid]
#_ATTR_CACHE.delete(hid)
# connected to m2m_changed signal in respective model class
def update_attr_cache(sender, **kwargs):
"Called when the many2many relation changes some way"
obj = kwargs['instance']
model = kwargs['model']
action = kwargs['action']
if kwargs['reverse']:
# the reverse relation changed (the Attribute itself was acted on)
pass
else:
# forward relation changed (the Object holding the Attribute m2m field)
if action == "post_add":
# cache all added objects
for attr_id in kwargs["pk_set"]:
attr_obj = model.objects.get(pk=attr_id)
set_attr_cache(obj, _GA(attr_obj, "db_key"), attr_obj)
elif action == "post_remove":
# obj.db_attributes.remove(attr) was called
for attr_id in kwargs["pk_set"]:
attr_obj = model.objects.get(pk=attr_id)
del_attr_cache(obj, _GA(attr_obj, "db_key"))
attr_obj.delete()
elif action == "post_clear":
# obj.db_attributes.clear() was called
for attr_id in kwargs["pk_set"]:
attr_obj = model.objects.get(pk=attr_id)
del_attr_cache(obj, _GA(attr_obj, "db_key"))
attr_obj.delete()
# access methods
@ -169,15 +177,23 @@ def get_attr_cache(obj, attrname):
hid = hashid(obj, "-%s" % attrname)
return hid and _ATTR_CACHE.get(hid, None) or None
def set_attr_cache(attrobj):
def set_attr_cache(obj, attrname, attrobj):
"Set the attr cache manually; this can be used to update"
attr_post_init(None, instance=attrobj)
global _ATTR_CACHE
hid = hashid(obj, "-%s" % attrname)
_ATTR_CACHE[hid] = attrobj
def del_attr_cache(obj, attrname):
"Del attribute cache"
global _ATTR_CACHE
hid = hashid(obj, "-%s" % attrname)
if hid in _ATTR_CACHE:
del _ATTR_CACHE[hid]
def flush_attr_cache():
"Clear attribute cache"
global _ATTR_CACHE
_ATTR_CACHE = {}
#_ATTR_CACHE.clear()
#------------------------------------------------------------
# Property cache - this is a generic cache for properties stored on models.