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# The contents of this file are subject to the BitTorrent Open Source License
# Version 1.1 (the License). You may not copy or use this file, in either
# source code or executable form, except in compliance with the License. You
# may obtain a copy of the License at http://www.bittorrent.com/license/.
#
# Software distributed under the License is distributed on an AS IS basis,
# WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
# for the specific language governing rights and limitations under the
# License.
from BitTorrent.platform import bttime as time
class Cache:
def __init__(self, touch_on_access = False):
self.data = {}
self.q = []
self.touch = touch_on_access
def __getitem__(self, key):
if self.touch:
v = self.data[key][1]
self[key] = v
return self.data[key][1]
def __setitem__(self, key, value):
t = time()
self.data[key] = (t, value)
self.q.insert(0, (t, key, value))
def __delitem__(self, key):
del(self.data[key])
def has_key(self, key):
return self.data.has_key(key)
def keys(self):
return self.data.keys()
def expire(self, expire_time):
try:
while self.q[-1][0] < expire_time:
x = self.q.pop()
assert(x[0] < expire_time)
try:
t, v = self.data[x[1]]
if v == x[2] and t == x[0]:
del(self.data[x[1]])
except KeyError:
pass
except IndexError:
pass
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