openmedialibrary/oml/cache.py
2016-01-17 16:32:17 +05:30

30 lines
766 B
Python

import time
class Cache(dict):
def __init__(self, ttl=10):
self._ttl = ttl
self._added = {}
def get(self, key):
if key in self._added:
if self._added[key] < time.time():
del self._added[key]
del self[key]
return
return dict.__getitem__(self, key)
def set(self, key, value, ttl=None):
ttl = ttl or self._ttl
self._added[key] = time.time() + ttl
dict.__setitem__(self, key, value)
def delete(self, key):
if key in self._added:
del self._added[key]
del self[key]
def clear(self, prefix):
for key in list(self):
if key.startswith(prefix):
self.delete(key)