class LRUEngineCache(DataKeyedCache):
"""!
An instance of DataKeyed cache using a least recently used (LRU) method
"""
def __init__(self, size=1000):
"""!
Constructor for LRUCache
@type size: int
@param size: maximum entries in the cache
"""
self.cache = LRUCache(maxsize=size)
def get_cache_value(self, cache_key):
return self.cache.get(cache_key)
def set_cache_value(self, key, value):
self.cache.__setitem__(key, value)
class ShareUsageTracker(Tracker):
"""!
The ShareUsageTracker is used by the ShareUsageElement to determine
whether to put evidence into a bundle to be sent to the 51Degrees
Share Usage service.
"""
def __init__(self, size=100, interval=1000):
"""!
Constructor for ShareUsageTracker
@type size: int
@param size: size of the share usage lru cache
@type interval: int
@param interval: how often to put evidence into the cache
"""
self.interval = interval
self.cache = LRUCache(maxsize=size)
def match(self, key, value):
"""!
The track method calls the dataKeyedCache get method,
if it receives a result it sends it onto a match function
@type key : cache key to run through tracker
@rtype bool
@return result of tracking
"""
difference = time.time() - value
if difference > self.interval:
self.set_cache_value(key, value)
return True
else:
return False
def get_cache_value(self, cachekey):
"""!
Get data from the cache
@type key : string
@param key : The cache key to lookup
@type value : mixed
@param key : None , or the stored data
"""
return self.cache.get(cachekey)
def set_cache_value(self, cachekey, value=None):
"""!
Place data in the cache
@type key : string
@param key : The cache key to store data under
@type value : mixed
@param key : Not used here as value is set to the date
"""
self.cache.__setitem__(cachekey, time.time())
