def load(cls, key):
if not cls.group:
raise ValueError()
# Try retrieve from memory cache
item = cache[cls.group].get(key)
if item:
# Return `item` from cache
return item
# Otherwise, try retrieve from disk
if not os.path.exists(cls.group_path()):
os.makedirs(cls.group_path())
path = cls.item_path(key)
if not FileIO.exists(path):
return None
# Load data from disk
try:
data = FileIO.read(path)
except Exception, ex:
log.warn('Unable to load "%s" (%s)', path, ex)
return None
def save(self):
if not self.group:
raise ValueError()
# Save to memory cache
cache[self.group][self.key] = self
# Save to disk
if not os.path.exists(self.group_path()):
os.makedirs(self.group_path())
FileIO.write(self.item_path(self.key), jsonpickle.encode(self))
def delete(cls, key):
if not cls.group:
raise ValueError()
# Delete from memory cache
cache[cls.group].delete(key)
# Delete from disk
if not os.path.exists(cls.group_path()):
os.makedirs(cls.group_path())
path = cls.item_path(key)
if not FileIO.exists(path):
return
FileIO.delete(path)