Re: [naviserver-devel] nacache

[Vlad S. <vl...@cr...>]

On that note i have another idea i'd like to discuss before i even start 
coding a prototype. There is thread on aolserver mailing list about 
upload prgoress, so i thought would it be a good idea to have global 
url-specific cache of all uploads, let's say, all requestes with 
content-length > 0. It will have only 2 alues, current size and total 
length and will last only for the time of upload. It will belong to Sock 
structure of the Request, so on close it will be freed as well.

Making it url-specific will give Web developer ability to generate 
uniaue urls for upload and then request statistics, requests with the 
same url will not override each other, server will update statistics for 
  the first created cache only, subsequent uploads with the same url 
will not show anything or show old values which is fine for security 
reasons.

Overhead is minimal and it will add one new commmand like 
ns_upload_stats url. SockRead will handle it all, so no other places are 
affected.

Is it worth trying?


Zoran Vasiljevic wrote:
> 
> Am 30.12.2005 um 15:46 schrieb Vlad Seryakov:
> 
>> I have web applications and server applications running on our  server 
>> and in my experience so far i always prefer global caches  over 
>> per-thread cache. If you need something local in long running  thread, 
>> you can use Tcl global variables to keep state during the  processing, 
>> even namespace variables. It is just one Tcl  interpreter anyway.
> 
> 
> True. But the state can be accumulating over time, though,
> leading to extensive memory usage. Hence the cache, as it
> can selecively expire things.
> 
> But...
> 
> I haven't any code needing per-thread caches, yet.
> As a tool in the toolbox, OK, but I will not press
> on that. I'm perfectly happy with global caches.
> 
> Zoran
> 
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-- 
Vlad Seryakov
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vl...@cr...
http://www.crystalballinc.com/vlad/