Mercurial > kallithea
view rhodecode/lib/vcs/utils/lazy.py @ 3334:968b28545f93 beta
fixed description of update-repoinfo command
author | Marcin Kuzminski <marcin@python-works.com> |
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date | Fri, 08 Feb 2013 19:08:52 +0100 |
parents | 79c5967a1e5c |
children | f134d125fb67 |
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class LazyProperty(object): """ Decorator for easier creation of ``property`` from potentially expensive to calculate attribute of the class. Usage:: class Foo(object): @LazyProperty def bar(self): print 'Calculating self._bar' return 42 Taken from http://blog.pythonisito.com/2008/08/lazy-descriptors.html and used widely. """ def __init__(self, func): self._func = func self.__module__ = func.__module__ self.__name__ = func.__name__ self.__doc__ = func.__doc__ def __get__(self, obj, klass=None): if obj is None: return self result = obj.__dict__[self.__name__] = self._func(obj) return result import threading class ThreadLocalLazyProperty(LazyProperty): """ Same as above but uses thread local dict for cache storage. """ def __get__(self, obj, klass=None): if obj is None: return self if not hasattr(obj, '__tl_dict__'): obj.__tl_dict__ = threading.local().__dict__ result = obj.__tl_dict__[self.__name__] = self._func(obj) return result