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call callback with expired items #19

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call callback with expired items #19

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7 changes: 6 additions & 1 deletion expiringdict/__init__.py
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Original file line number Diff line number Diff line change
Expand Up @@ -26,14 +26,15 @@


class ExpiringDict(OrderedDict):
def __init__(self, max_len, max_age_seconds):
def __init__(self, max_len, max_age_seconds, callback=None):
assert max_age_seconds >= 0
assert max_len >= 1

OrderedDict.__init__(self)
self.max_len = max_len
self.max_age = max_age_seconds
self.lock = RLock()
self.callback = callback

def __contains__(self, key):
""" Return True if the dict has a key, else return False. """
Expand All @@ -43,6 +44,8 @@ def __contains__(self, key):
if time.time() - item[1] < self.max_age:
return True
else:
if self.callback:
self.callback(item[0])
del self[key]
except KeyError:
pass
Expand All @@ -62,6 +65,8 @@ def __getitem__(self, key, with_age=False):
else:
return item[0]
else:
if self.callback:
self.callback(item[0])
del self[key]
raise KeyError(key)

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