def get(self, key, default=None, timeout=None):
"""
Get a value from the storage.
:param key: The key of the requested storage value
:param default: The value that's returned if the requested key doesn't
exist. Defaults to None.
:param timeout: Give up cache writing after a specific time
"""
value = self.cache.get('storage/' + key)
if value is not None:
return value
result = db.session.execute(
db.select([Storage.value]).where(Storage.key == key)).fetchone()
if result is None:
return default
value = result[0]
self._update_cache(key, value, timeout)
return value
def get_many(self, keys, timeout=None):
"""
Get many cached values with just one cache hit or database query.
:param keys: A list of the requested keys
:param timeout: Give up cache writing after a specific time
"""
objects = self.cache.get_dict(*('storage/%s' % key for key in keys))
values = {}
for key, value in objects.iteritems():
values[key[8:]] = value
#: a list of keys that aren't yet in the cache.
#: They are queried using a database call.
to_fetch = [k for k in keys if values.get(k) is None]
if to_fetch:
# get the items that are not in cache using a database query
query = db.select([Storage.key, Storage.value]) \
.where(Storage.key.in_(to_fetch))
for key, value in db.session.execute(query):
values[key] = value
self._update_cache(key, value, timeout)
return values
def get_many(self, keys, timeout=None):
"""
Get many cached values with just one cache hit or database query.
:param keys: A list of the requested keys
:param timeout: Give up cache writing after a specific time
"""
objects = self.cache.get_dict(*('storage/%s' % key for key in keys))
values = {}
for key, value in objects.iteritems():
values[key[8:]] = value
#: a list of keys that aren't yet in the cache.
#: They are queried using a database call.
to_fetch = [k for k in keys if values.get(k) is None]
if to_fetch:
# get the items that are not in cache using a database query
query = db.select([Storage.key, Storage.value]) \
.where(Storage.key.in_(to_fetch))
for key, value in db.session.execute(query):
values[key] = value
self._update_cache(key, value, timeout)
return values
def get(self, key, default=None, timeout=None):
"""
Get a value from the storage.
:param key: The key of the requested storage value
:param default: The value that's returned if the requested key doesn't
exist. Defaults to None.
:param timeout: Give up cache writing after a specific time
"""
value = self.cache.get('storage/' + key)
if value is not None:
return value
result = db.session.execute(
db.select([Storage.value]).where(Storage.key == key)
).fetchone()
if result is None:
return default
value = result[0]
self._update_cache(key, value, timeout)
return value
