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annotate rhodecode/lib/vcs/utils/lazy.py @ 3057:79c5967a1e5c beta

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author Marcin Kuzminski <marcin@python-works.com>
date Mon, 03 Dec 2012 02:56:57 +0100
parents 7ae9939409ab
children f134d125fb67
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rev   line source
2007
324ac367a4da Added VCS into rhodecode core for faster and easier deployments of new versions
Marcin Kuzminski <marcin@python-works.com>
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1 class LazyProperty(object):
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2 """
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3 Decorator for easier creation of ``property`` from potentially expensive to
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4 calculate attribute of the class.
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5
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6 Usage::
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7
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8 class Foo(object):
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9 @LazyProperty
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10 def bar(self):
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11 print 'Calculating self._bar'
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12 return 42
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13
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14 Taken from http://blog.pythonisito.com/2008/08/lazy-descriptors.html and
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15 used widely.
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16 """
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17
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18 def __init__(self, func):
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19 self._func = func
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20 self.__module__ = func.__module__
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21 self.__name__ = func.__name__
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22 self.__doc__ = func.__doc__
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23
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24 def __get__(self, obj, klass=None):
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25 if obj is None:
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26 return self
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27 result = obj.__dict__[self.__name__] = self._func(obj)
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28 return result
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7ae9939409ab Use ThreadLocal storage for dulwich cached repos, finally fixes issues on concurent opening git pack files via dulwich
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29
7ae9939409ab Use ThreadLocal storage for dulwich cached repos, finally fixes issues on concurent opening git pack files via dulwich
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30 import threading
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33 class ThreadLocalLazyProperty(LazyProperty):
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34 """
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35 Same as above but uses thread local dict for cache storage.
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36 """
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37
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38 def __get__(self, obj, klass=None):
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39 if obj is None:
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40 return self
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41 if not hasattr(obj, '__tl_dict__'):
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42 obj.__tl_dict__ = threading.local().__dict__
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43
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44 result = obj.__tl_dict__[self.__name__] = self._func(obj)
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45 return result