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https://github.com/SickGear/SickGear.git
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69 lines
2 KiB
Python
69 lines
2 KiB
Python
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# -*- coding: utf-8 -*-
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'''
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Single-process in-memory cache.
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The shove psuedo-URL for a simple cache is:
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simple://
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'''
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import time
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import random
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from shove import SimpleBase
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class SimpleCache(SimpleBase):
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'''Single-process in-memory cache.'''
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def __init__(self, engine, **kw):
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super(SimpleCache, self).__init__(engine, **kw)
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# Get random seed
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random.seed()
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# Set maximum number of items to cull if over max
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self._maxcull = kw.get('maxcull', 10)
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# Set max entries
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self._max_entries = kw.get('max_entries', 300)
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# Set timeout
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self.timeout = kw.get('timeout', 300)
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def __getitem__(self, key):
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exp, value = super(SimpleCache, self).__getitem__(key)
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# Delete if item timed out.
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if exp < time.time():
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super(SimpleCache, self).__delitem__(key)
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raise KeyError(key)
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return value
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def __setitem__(self, key, value):
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# Cull values if over max # of entries
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if len(self) >= self._max_entries:
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self._cull()
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# Set expiration time and value
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exp = time.time() + self.timeout
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super(SimpleCache, self).__setitem__(key, (exp, value))
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def _cull(self):
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'''Remove items in cache to make room.'''
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num, maxcull = 0, self._maxcull
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# Cull number of items allowed (set by self._maxcull)
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for key in self.keys():
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# Remove only maximum # of items allowed by maxcull
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if num <= maxcull:
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# Remove items if expired
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try:
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self[key]
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except KeyError:
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num += 1
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else:
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break
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# Remove any additional items up to max # of items allowed by maxcull
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while len(self) >= self._max_entries and num <= maxcull:
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# Cull remainder of allowed quota at random
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del self[random.choice(self.keys())]
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num += 1
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__all__ = ['SimpleCache']
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