Re: [naviserver-devel] [naviserver-commits] naviserver ChangeLog, 1.405, 1.406

[Zoran V. <zv...@ar...>]

Am 29.06.2006 um 22:44 schrieb Vlad Seryakov:

> So, i am being told all the time that i do not use the ns_cache in  
> right
> way, then somebody can define what is the correct and the only  
> right way
> of using ns_cache facility in the server environment? I could be  
> lost or
> un-educated enough but i would like to know?
>

It is not the question of "right" or "wrong"! Lets not misunderstand
each other.
I can't tell you what is "right" or what's "wrong" but I can try to
explain how I see the "usual" cache usage....

Noormally I'd use cache to save data which is rather expensive to
calculate. In that case I will temporary save (hard calculated)
data into some (size-limited) storage and read it from there.
I also expect that this data will not change for some (rather short)
period of time and for that time I will retain it in the cache.

A real-world examnple would be DNS lookup, or SQL selection
or things lie that. In our code, I extensively use caches
to store ID's of elements in a tree structure (similar to
directory) which is emulated in 2 dimension table(s).
It is rather expensive to get that info and since it does not
change that often, I put those things in the cache.

I will however NOT use cache structures to maintain values used
for commumincation or decision purposes. I would use nsv's or
files or similar.

Having said that, I must stress that it is perfectly allright
for me that anybody uses whatever tools he needs to get the job
done. It is just that I see cache module usage in a certain patterns
which may or may not correspond to the view of other people.

So what we are all about here is to understand what EXACTLY you
are after and perhaps see if the cache as-is is the optimal solution
for that, because our experience may be different from yours.
But: if you say: guys, I know what I need, then I'm allright with that
and will support you all the way.

Allright?

Cheers,
Zoran