You should never access the cache internals like
x = cache.ram.storage['myObj'][1] # DON'T
because it is not thread safe. You should have something like:
def makeMe():
return cStringIO.StringIO()
def getMe():
x = cache.ram("myObj", lambda:makeMe(), 5)
response.headers['Content-Type']='image/png'
response.stream(x)
You only need to call getMe and if "myObj" does not exist or it older
than 5 secods, it will make and cache a new one. You actually do not
need at all a makeMe() since you can do
def getMe():
x = cache.ram("myObj", lambda:cStringIO.StringIO(), 5)
response.headers['Content-Type']='image/png'
response.stream(x)
Mind that the particular object you are using cString().String() make
be accessed by multiple threads at the same time after you extract it
from cache. This may or may not be OK, depends on the details of the
app.
Massimo
On Mar 25, 1:56 pm, Mark Larsen <larsen...@gmail.com> wrote:
> Web2Pyers,
>
> What the appropriate way to use cache.ram? Let's say I want to cache an
> object (in my case its a cStringIO). In my controller function -->
>
> def makeMe():
> x = cStringIO.StringIO()
> cache.ram("myObj", lambda: x, 5)
>
> def getMe():
> x = cache.ram.storage['myObj'][1]
> response.headers['Content-Type']='image/png'
> response.stream(x)
>
> While this works, am I missing something?
>
> Also is the cache object unique for each session? Does Web2py have any
> concept of a shared cache for all sessons?
>
> Thanks,
>
> Mark
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