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- """
- flask_caching.backends.simple
- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
- The simple cache backend.
- :copyright: (c) 2018 by Peter Justin.
- :copyright: (c) 2010 by Thadeus Burgess.
- :license: BSD, see LICENSE for more details.
- """
- import logging
- from cachelib import SimpleCache as CachelibSimpleCache
- from flask_caching.backends.base import BaseCache
- logger = logging.getLogger(__name__)
- class SimpleCache(BaseCache, CachelibSimpleCache):
- """Simple memory cache for single process environments. This class exists
- mainly for the development server and is not 100% thread safe. It tries
- to use as many atomic operations as possible and no locks for simplicity
- but it could happen under heavy load that keys are added multiple times.
- :param threshold: the maximum number of items the cache stores before
- it starts deleting some.
- :param default_timeout: the default timeout that is used if no timeout is
- specified on :meth:`~BaseCache.set`. A timeout of
- 0 indicates that the cache never expires.
- :param ignore_errors: If set to ``True`` the :meth:`~BaseCache.delete_many`
- method will ignore any errors that occurred during
- the deletion process. However, if it is set to
- ``False`` it will stop on the first error. Defaults
- to ``False``.
- """
- def __init__(self, threshold=500, default_timeout=300, ignore_errors=False):
- BaseCache.__init__(self, default_timeout=default_timeout)
- CachelibSimpleCache.__init__(
- self, threshold=threshold, default_timeout=default_timeout
- )
- self.ignore_errors = ignore_errors
- @classmethod
- def factory(cls, app, config, args, kwargs):
- kwargs.update(
- dict(
- threshold=config["CACHE_THRESHOLD"],
- ignore_errors=config["CACHE_IGNORE_ERRORS"],
- )
- )
- return cls(*args, **kwargs)
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