This document is for Kombu's development version, which can be significantly different from previous releases. Get the stable docs here: 5.0.
Source code for kombu.utils.objects
"""Object Utilities."""
__all__ = ('cached_property',)
try:
from functools import _NOT_FOUND
from functools import cached_property as _cached_property
except ImportError:
# TODO: Remove this fallback once we drop support for Python < 3.8
from cached_property import threaded_cached_property as _cached_property
_NOT_FOUND = object()
[docs]class cached_property(_cached_property):
"""Implementation of Cached property."""
def __init__(self, fget=None, fset=None, fdel=None):
super().__init__(fget)
self.__set = fset
self.__del = fdel
if not hasattr(self, 'attrname'):
# This is a backport so we set this ourselves.
self.attrname = self.func.__name__
def __get__(self, instance, owner=None):
# TODO: Remove this after we drop support for Python<3.8
# or fix the signature in the cached_property package
return super().__get__(instance, owner)
def __set__(self, instance, value):
if instance is None:
return self
with self.lock:
if self.__set is not None:
value = self.__set(instance, value)
cache = instance.__dict__
cache[self.attrname] = value
def __delete__(self, instance):
if instance is None:
return self
with self.lock:
value = instance.__dict__.pop(self.attrname, _NOT_FOUND)
if self.__del and value is not _NOT_FOUND:
self.__del(instance, value)
