Class CachedGetter
source code
object --+
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CachedGetter
A cache for a callable.
This is basically memoization, except that these are supposed to be
singletons; CachedGetters should be used where the construction of a
resource (e.g., a grammar) should be deferred until it is actually needed
to save on startup times.
The resource is created on the first call, all further calls just
return references to the original object.
You can also leave out the getter argument and add an argumentless
method impl computing the value to cache.
Using a CachedGetter also serializes generation, so you can also use
it when getter isn't thread-safe.
At construction, you can pass a f(thing) -> bool in an isAlive
keyword argument. If you do, the function will be called with the cache
before the cache is being returned. If it returns false, the resource is
re-made (no concurrency control is enforced here).
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__init__(self,
getter,
*args,
**kwargs)
x.__init__(...) initializes x; see help(type(x)) for signature |
source code
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Inherited from object:
__delattr__,
__format__,
__getattribute__,
__hash__,
__new__,
__reduce__,
__reduce_ex__,
__repr__,
__setattr__,
__sizeof__,
__str__,
__subclasshook__
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Inherited from object:
__class__
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__init__(self,
getter,
*args,
**kwargs)
(Constructor)
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x.__init__(...) initializes x; see help(type(x)) for signature
- Overrides:
object.__init__
- (inherited documentation)
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