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LRU with midpoint insertion (LRU2Q) cache decorator for Python
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| class MidpointLruCache: | |
| def __init__(self, size, oldpercentage): | |
| self.size = size | |
| self.oldsize = size * oldpercentage / 100 | |
| self.youngsize = size * (100 - oldpercentage) / 100 | |
| self.youngitems = collections.OrderedDict() | |
| self.olditems = collections.OrderedDict() | |
| def __call__(self, func): | |
| def wrapper(arg): | |
| if arg in self.olditems: | |
| value = self.olditems[arg] | |
| del self.olditems[arg] | |
| self.olditems[arg] = value | |
| elif arg in self.youngitems: | |
| value = self.youngitems[arg] | |
| del self.youngitems[arg] | |
| self.olditems[arg] = value | |
| else: | |
| value = func(arg) | |
| self.youngitems[arg] = value | |
| if len(self.olditems) > self.oldsize: | |
| poparg,popvalue = self.olditems.popitem(False) | |
| self.youngitems[poparg] = popvalue | |
| while len(self.olditems)+len(self.youngitems) > self.size: | |
| self.youngitems.popitem(False) | |
| return value | |
| return wrapper |
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