Hi, Wai Mun
Create a class named, say, HitCounter, with a method Increment(String):
public class HitCounter
{
Hashtable pageCounts = new Hashtable();
public void Increment(String s) {
int[] count = (int[])pageCounts.get(s);
if (count == null) {
count = new int[1];
count[0] = 0;
pageCounts.put(s,count);
}
count[0]++;
}
// method to access counts here
}
Note that since Hashtable instances are thread-safe, your counter variables are
automatically protected from concurrent access. You also need to define a
method to access the counts.
You can then embed this class in any jsp or servlet that needs to count accesses
to URIs it handles. I believe a more general way to handle this is via
server-side includes, but exactly how that is done is server-dependent.
Hope this helps.
Regards,
Noel Lecaros
Wai Mun wrote:
> Yes! how do i do that? how do i synchronize access to the counter variable?
> do u have a snippet to show?
>
> thank you very much!
> ----- Original Message -----
> From: "Noel E. Lecaros" <[EMAIL PROTECTED]>
> To: <[EMAIL PROTECTED]>
> Sent: Sunday, May 06, 2001 12:18
> Subject: Re: file lock
>
> > Hi, Wai Mun
> >
> > Do you mean that every page access generates one file access? Why don't
> you put
> > the counter in the servlet context and synchronize access to the counter
> > variable?
> >
> > Regards,
> > Noel Lecaros
> >
> > Wai Mun wrote:
> >
> > > if i need to create a counter for a web page, how do i ensure that there
> > > will be no other process that try to access the couter file at the same
> time
> > > for updating the value in the file? i.e. how do i lock the file for
> > > exclusive writing?
> > >
> > > but if i'm able to lock the file, then how can i effectively update the
> > > counter, say there are ten people accessing the web page at the same
> time?
> > >
> > > pls advice, thank a lot!
> > >
> > >
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