openmedialibrary/oml/cache.py

30 lines
760 B
Python

import time
class Cache(dict):
def __init__(self, ttl=10):
self._ttl = ttl
self._added = {}
def get(self, key):
now = time.time()
for key, value in list(self._added.items()):
if value < now:
del self._added[key]
del self[key]
return dict.get(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)