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"""
Null Backend
-------------
The Null backend does not do any caching at all. It can be
used to test behavior without caching, or as a means of disabling
caching for a region that is otherwise used normally.
.. versionadded:: 0.5.4
"""
from dogpile.cache.api import CacheBackend, NO_VALUE
__all__ = ['NullBackend']
class NullLock(object):
def acquire(self):
pass
def release(self):
pass
class NullBackend(CacheBackend):
"""A "null" backend that effectively disables all cache operations.
Basic usage::
from dogpile.cache import make_region
region = make_region().configure(
'dogpile.cache.null'
)
"""
def __init__(self, arguments):
pass
def get_mutex(self, key):
return NullLock()
def get(self, key):
return NO_VALUE
def get_multi(self, keys):
return [NO_VALUE for k in keys]
def set(self, key, value):
pass
def set_multi(self, mapping):
pass
def delete(self, key):
pass
def delete_multi(self, keys):
pass
|
