class CoapLRUCache(Cache):
def __init__(self, mode, max_dim):
"""
Initialise an LRU cache for the Coap.
:param max_dim: max number of elements in the cache
:param mode: used to differentiate between a cache used in a forward-proxy or in a reverse-proxy
"""
Cache.__init__(self, mode, max_dim)
self.cache = LRUCache(maxsize=max_dim)
def __str__(self):
msg = []
for e in list(self.cache.values()):
msg.append(str(e))
return ("Cache Size: {sz}\n" + "\n".join(msg))
def debug_print(self):
"""
:return: a debug printout for the current cache.
"""
return ("size = %s\n%s" % (
self.cache.currsize,
'\n'.join([
( "element.max age %s\n"\
"element.uri %s\n"\
"element.freshness %s" ) % (
element.max_age,
element.uri,
element.freshness )
for key, element
in list(self.cache.items())
])))
class CoapLRUCache(CoapCache):
def __init__(self, max_dim):
"""
:param max_dim:
"""
self.cache = LRUCache(maxsize=max_dim)
def update(self, key, element):
"""
:param key:
:param element:
:return:
"""
logger.debug("updating cache, key: %s, element: %s", \
key.hashkey, element)
self.cache.update([(key.hashkey, element)])
def get(self, key):
"""
:param key:
:return: CacheElement
"""
try:
response = self.cache[key.hashkey]
except KeyError:
logger.debug("problem here", exc_info=1)
response = None
return response
def is_full(self):
"""
:return:
"""
if self.cache.currsize == self.cache.maxsize:
return True
return False
def is_empty(self):
"""
:return:
"""
if self.cache.currsize == 0:
return True
return False
def __str__(self):
msg = []
for e in self.cache.values():
msg.append(str(e))
return "Cache Size: {sz}\n" + "\n".join(msg)
def debug_print(self):
"""
:return:
"""
return ("size = %s\n%s" % (
self.cache.currsize,
'\n'.join([
( "element.max age %s\n"\
"element.uri %s\n"\
"element.freshness %s" ) % (
element.max_age,
element.uri,
element.freshness )
for key, element
in list(self.cache.items())
])))
class CoapLRUCache(CoapCache):
def __init__(self, max_dim):
"""
:param max_dim:
"""
self.cache = LRUCache(maxsize=max_dim)
def update(self, key, element):
"""
:param key:
:param element:
:return:
"""
print "updating cache"
print "key: ", key.hashkey
print "element: ", element
self.cache.update([(key.hashkey, element)])
def get(self, key):
"""
:param key:
:return: CacheElement
"""
try:
response = self.cache[key.hashkey]
except KeyError:
print "problem here"
response = None
return response
def is_full(self):
"""
:return:
"""
if self.cache.currsize == self.cache.maxsize:
return True
return False
def is_empty(self):
"""
:return:
"""
if self.cache.currsize == 0:
return True
return False
def __str__(self):
msg = []
for e in self.cache.values():
msg.append(str(e))
return "Cache Size: {sz}\n" + "\n".join(msg)
def debug_print(self):
"""
:return:
"""
print "size = ", self.cache.currsize
list = self.cache.items()
for key, element in list:
print "element.max age ", element.max_age
print "element.uri", element.uri
print "element.freshness ", element.freshness
