Commit 0de46cca authored by Paul McCarthy's avatar Paul McCarthy 🚵
Browse files

ENH: Cache has an lru option

parent 60a468c7
......@@ -42,14 +42,20 @@ class Cache(object):
def __init__(self, maxsize=100):
def __init__(self, maxsize=100, lru=False):
"""Create a ``Cache``.
:arg maxsize: Maximum number of items allowed in the ``Cache`` before
it starts dropping old items
:arg lru: (least recently used) If ``False`` (the default), items
are dropped according to their insertion time. Otherwise,
items are dropped according to their most recent access
self.__cache = collections.OrderedDict()
self.__maxsize = maxsize
self.__lru = lru
def put(self, key, value, expiry=0):
......@@ -94,14 +100,26 @@ class Cache(object):
entry = self.__cache[key]
# Check to see if the entry
# has expired
now = time.time()
if entry.expiry > 0:
if time.time() - entry.storetime > entry.expiry:
if now - entry.storetime > entry.expiry:
if defaultSpecified: return default
else: raise Expired(key)
# If we are an lru cache, update
# this entry's expiry, and update
# its order in the cache dict
if self.__lru:
entry.storetime = now
self.__cache[key] = entry
return entry.value
......@@ -134,7 +152,7 @@ class Cache(object):
- ``True`` if a default argument was specified, ``False``
- The specifeid default value, or ``None`` if it wasn't
- The specified default value, or ``None`` if it wasn't
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