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Use proper clock if possible

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This commit is contained in:
ZyX 2013-03-13 17:08:22 +04:00
parent abe0b1a647
commit f8db46b406
1 changed files with 11 additions and 3 deletions
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14
powerline/lib/memoize.py
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@ -1,7 +1,12 @@
# vim:fileencoding=utf-8:noet # vim:fileencoding=utf-8:noet
from functools import wraps from functools import wraps
import time try:
# Python>=3.3, the only valid clock source for this job
from time import monotonic as time
except ImportError:
# System time, is affected by clock updates.
from time import time
def default_cache_key(**kwargs): def default_cache_key(**kwargs):
@ -28,10 +33,13 @@ class memoize(object):
cached = self.cache.get(key, None) cached = self.cache.get(key, None)
except TypeError: except TypeError:
return func(**kwargs) return func(**kwargs)
if cached is None or time.time() - cached['time'] > self.timeout: # Handle case when time() appears to be less then cached['time'] due
# to clock updates. Not applicable for monotonic clock, but this
# case is currently rare.
if cached is None or not (cached['time'] < time() < cached['time'] + self.timeout):
cached = self.cache[key] = { cached = self.cache[key] = {
'result': func(**kwargs), 'result': func(**kwargs),
'time': time.time(), 'time': time(),
} }
return cached['result'] return cached['result']
return decorated_function return decorated_function