Maybe this would work:
cache.ram('MyValue',
lambda: getvalue() or cache.ram('MyValue', lambda: None,time_expire
=None),
time_expire=60*60*24)
Calling cache.ram() with time_expire=None always retrieves the currently
stored value, so you can assign that if getvalue() returns None (I'm
assuming when getvalue() works it doesn't return other types of Falsey
values -- if so, then you'll have to test specifically for None).
Another option might be to change the getvalue() function directly
(assuming it makes sense to encode the cache key into it):
def getvalue():
try:
return function_that_may_not_complete()
except:
return cache.ram("MyValue", lambda: None, time_expire=None)
Anthony
On Friday, March 22, 2013 9:32:16 AM UTC-4, villas wrote:
>
> 1. How can I view a currently cached value, without any possibility of
> changing it?
>
> 2. Say I have this code:
>
> def getvalue():
> try:
> return function_that_may_not_complete()
> except:
> return None
>
> cache.ram('MyValue', lambda: getvalue(), time_expire=60*60*24)
>
>
> If my getvalue() function returns none, I assume the cache will be
> cleared. I do not want that to happen.
> If getvalue()returns None, I want to re-cache the same value.
>
> Hope the above makes sense.
> Thanks
>
>
>
>
--
---
You received this message because you are subscribed to the Google Groups
"web2py-users" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
For more options, visit https://groups.google.com/groups/opt_out.
