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Code Issues 25 Releases Wiki Activity

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.

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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: