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from __future__ import absolute_import, print_function, division
import netlib.utils
pkg_data = netlib.utils.Data(__name__)
class LRUCache:
"""
A simple LRU cache for generated values.
"""
def __init__(self, size=100):
self.size = size
self.cache = {}
self.cacheList = []
def get(self, gen, *args):
"""
gen: A (presumably expensive) generator function. The identity of
gen is NOT taken into account by the cache.
*args: A list of immutable arguments, used to establish identiy by
*the cache, and passed to gen to generate values.
"""
if args in self.cache:
self.cacheList.remove(args)
self.cacheList.insert(0, args)
return self.cache[args]
else:
ret = gen(*args)
self.cacheList.insert(0, args)
self.cache[args] = ret
if len(self.cacheList) > self.size:
d = self.cacheList.pop()
self.cache.pop(d)
return ret
def log_tier(level):
return dict(error=0, warn=1, info=2, debug=3).get(level)
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