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Try to save memory and time when using lazy objects by refering to their function via the closure, and not making it an attribute on each instance. 

git-svn-id: http://code.djangoproject.com/svn/django/trunk@17360 bcc190cf-cafb-0310-a4f2-bffc1f526a37
This commit is contained in:
Alex Gaynor 2012-01-08 19:16:33 +00:00
parent 05a3ecbf96
commit 4a92059b08
1 changed files with 9 additions and 10 deletions
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19
django/utils/functional.py
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@ -66,7 +66,6 @@ def lazy(func, *resultclasses):
__dispatch = None
def __init__(self, args, kw):
self.__func = func
self.__args = args
self.__kw = kw
if self.__dispatch is None:
@ -75,7 +74,7 @@ def lazy(func, *resultclasses):
def __reduce__(self):
return (
_lazy_proxy_unpickle,
(self.__func, self.__args, self.__kw) + resultclasses
(func, self.__args, self.__kw) + resultclasses
)
def __prepare_class__(cls):
@ -100,13 +99,13 @@ def lazy(func, *resultclasses):
cls.__str__ = cls.__str_cast
__prepare_class__ = classmethod(__prepare_class__)
def __promise__(cls, klass, funcname, func):
def __promise__(cls, klass, funcname, method):
# Builds a wrapper around some magic method and registers that magic
# method for the given type and method name.
def __wrapper__(self, *args, **kw):
# Automatically triggers the evaluation of a lazy value and
# applies the given magic method of the result type.
res = self.__func(*self.__args, **self.__kw)
res = func(*self.__args, **self.__kw)
for t in type(res).mro():
if t in self.__dispatch:
return self.__dispatch[t][funcname](res, *args, **kw)
@ -114,23 +113,23 @@ def lazy(func, *resultclasses):
if klass not in cls.__dispatch:
cls.__dispatch[klass] = {}
cls.__dispatch[klass][funcname] = func
cls.__dispatch[klass][funcname] = method
return __wrapper__
__promise__ = classmethod(__promise__)
def __unicode_cast(self):
return self.__func(*self.__args, **self.__kw)
return func(*self.__args, **self.__kw)
def __str_cast(self):
return str(self.__func(*self.__args, **self.__kw))
return str(func(*self.__args, **self.__kw))
def __cmp__(self, rhs):
if self._delegate_str:
s = str(self.__func(*self.__args, **self.__kw))
s = str(func(*self.__args, **self.__kw))
elif self._delegate_unicode:
s = unicode(self.__func(*self.__args, **self.__kw))
s = unicode(func(*self.__args, **self.__kw))
else:
s = self.__func(*self.__args, **self.__kw)
s = func(*self.__args, **self.__kw)
if isinstance(rhs, Promise):
return -cmp(rhs, s)
else: