thanks for the advice as well as nic.
i'm rather confused now, why must the file opening/closing be done in the
init? if so, then where should i place the code i.e. which servlet's init
the code should be placed?
& lastly, is it costly to open/close files everytime? what are the cons? &
pros if any? wats the best solution?
----- Original Message -----
From: "Christopher K. St. John" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Sunday, June 03, 2001 00:20
Subject: Re: counter file
> Nic Ferrier wrote:
> >
> > > Wai Mun <[EMAIL PROTECTED]> 02-Jun-01 3:26:00 PM >>>
> >
> > >how do i update the counter file efficiently?
> >
> > The constructor:
> > - creates a seperate thread for managing the file
> >
>
> If you create a thread in the init() method, you have
> to get rid of it in the destroy() method. But Java
> doesn't make it easy to get rid of threads: the thead
> itself has to cooperate, and be very carefully written.
> So if at all possible it's a good idea to avoid spawning
> threads in servlets.
>
> It might seem trivial (what's a couple of extra threads
> laying around?), but it's like not free'ing memory in
> C++: fine for little 5 line utilities, but in servers,
> leaks accumulate and are expensive to hunt down. Plus,
> it's just bad practice.
>
> Depending on the expected load, it might make sense to
> just try open/write/close-on-every-request and see
> if it really is a problem. Premature optimization is the
> root of all evil, etc.
>
> If that doesn't work, then Nic's idea works fine without
> using a thread if you have the log method itself write out
> the buffer once every 1000 (or 100 or 10 or whatever)
> requests. That way, the file i/o cost is amortized out over
> many requests. But remember to flush the buffer in the
> destroy() method of the servlet. And you might add a way
> for a servlet request to force a buffer flush.
>
>
> --
> Christopher St. John [EMAIL PROTECTED]
> DistribuTopia http://www.distributopia.com
>
>
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