File size: 916 Bytes
26e6f31 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 | from collections import OrderedDict
class LRUDict(OrderedDict):
"""
Cache implementation based on ordered dict with a maximum number of items. Last accessed item will be evicted
first. Currently used by idempotency utility.
"""
def __init__(self, max_items=1024, *args, **kwargs):
self.max_items = max_items
super().__init__(*args, **kwargs)
def __getitem__(self, key):
value = super().__getitem__(key)
self.move_to_end(key)
return value
def __setitem__(self, key, value):
if key in self:
self.move_to_end(key)
super().__setitem__(key, value)
if len(self) > self.max_items:
oldest = next(iter(self))
del self[oldest]
def get(self, key, *args, **kwargs):
item = super().get(key, *args, **kwargs)
if item:
self.move_to_end(key=key)
return item
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