def load( self, Object_type, object_id, revision = None ):
"""
Load the object corresponding to the given object id from the database and return it, or None if
the object_id is unknown. If a revision is provided, a specific revision of the object will be
loaded.
@type Object_type: type
@param Object_type: class of the object to load
@type object_id: unicode
@param object_id: id of the object to load
@type revision: int or NoneType
@param revision: revision of the object to load (optional)
@rtype: Object_type or NoneType
@return: loaded object, or None if no match
"""
if revision or Object_type in self.CLASSES_NOT_TO_CACHE:
cache = None
else:
cache = self.__get_cache_connection()
if cache: # don't bother caching old revisions
obj = cache.get( Persistent.make_cache_key( Object_type, object_id ) )
if obj:
return obj
obj = self.select_one( Object_type, Object_type.sql_load( object_id, revision ) )
if obj and cache:
cache.set( obj.cache_key, obj )
return obj
def uncache_many( self, Object_type, obj_ids ):
cache = self.__get_cache_connection()
if not cache: return
for obj_id in obj_ids:
cache.delete( Persistent.make_cache_key( Object_type, obj_id ) )
