def read_item(self, user, now=None):
"""Notice that user has accessed this item.
If we are a comment, we pass this on to our parent item, to
catch up based on comment's submission date.
"""
if not hasattr(self, "_BlogItem__user_access"):
# we don't keep track of user access -- we're a comment,
# so just pass this on to our parent.
if self.parent_blogitem:
return self.parent_blogitem.read_item(user, self.date)
return
if not user:
return
now = now or datetime.utcnow()
user_oid = unpack_oid(user._p_oid)
dt, count = self.__user_access.get(user_oid, (never, 0))
now = max(now, dt)
# increment hit count
self.__user_access[user_oid] = (now, count + 1)
def up_to_date(self, target, observer):
"""Return true if observer is up to date with respect to key.
Returns true if observe(key, observer) has been called more
recently than notify_changed(key).
"""
assert hasattr(target, '_p_oid'), 'target must be Persistent.'
assert hasattr(observer, '_p_oid'), 'observer must be Persistent.'
key = unpack_oid(target._p_oid)
observer_oid = unpack_oid(observer._p_oid)
o_list = self.root.get(key, None)
if o_list:
return observer_oid in o_list
return False
def stop_observing(self, target, observer):
"""Unregister observer as watching/dependent on target."""
assert hasattr(target, '_p_oid'), 'target must be Persistent.'
assert hasattr(observer, '_p_oid'), 'observer must be Persistent.'
# newly-created objects that are uncommitted may not have OIDs yet
if not target._p_oid or not observer._p_oid:
return
key = unpack_oid(target._p_oid)
observer_oid = unpack_oid(observer._p_oid)
o_list = self.root.get(key, None)
if o_list:
while observer_oid in o_list:
o_list.remove(observer_oid)
def observe(self, target, observer):
"""Register observer as watching/dependent on target."""
assert hasattr(target, '_p_oid'), 'target must be Persistent.'
assert hasattr(observer, '_p_oid'), 'observer must be Persistent.'
# newly-created objects that are uncommitted may not have OIDs yet
if not target._p_oid or not observer._p_oid:
return
key = unpack_oid(target._p_oid)
observer_oid = unpack_oid(observer._p_oid)
o_list = self.root.get(key, None)
if o_list is not None:
if not observer_oid in o_list:
o_list.append(observer_oid)
else:
self[key] = PersistentList([observer_oid])
def notify_changed(self, target):
"""Called by target to notify that it has changed."""
assert hasattr(target, '_p_oid'), 'target must be Persistent.'
# newly-created objects that are uncommitted may not have OIDs yet
if not target._p_oid:
return
key = unpack_oid(target._p_oid)
if self.root.has_key(key):
del self[key]
def upgradeToVersion3(self):
# move all data from ReaderList into BlogItems
from qon.base import get_user_database
user_db = get_user_database()
for user_id, reader in self.__reader_list.readers.iteritems():
user = user_db.get_user(user_id)
if not user:
continue
user_oid = unpack_oid(user._p_oid)
for item_id, data in reader.read_items.iteritems():
dt, count = data
item = self.get_item(item_id)
item._BlogItem__user_access[user_oid] = (dt, count)
del self.__reader_list
self.version_upgrade_done()
def _get_user_access(self, user):
if not hasattr(self, "_BlogItem__user_access"):
return (never, 0)
user_oid = unpack_oid(user._p_oid)
return self.__user_access.get(user_oid, (never, 0))
