Hello,
i think i'll elaborate a little on my problem. here:
In my credit card processing servlet(a proto for our project) i am making
https calls to bank(dummy) and mall(dummy) for verifying client details. Now
since making 2-3 https calls takes a while i want to know at the end of
processing whether the client is still there or he has got disconnected
somehow. It is very imp coz my servlet(and hence the Bank) might have
committed the transaction and the client will never know. In that case i want
to send him email. So what r the possible ways for me to know that client has
got disconnected..? At the end of my procesing i redirect the client back to
the mall where he came from. I triend to capture the function's IOException to
know whether the cliend has got disconnected but it doesn't work all the
time. Sometimes i get a Committed Transaction without a corresponding email
being generated.
Is it advisable to use Time-outs..? can ICMP help me polling the client..? or
some other way of pinging the client..?
Please help me.
Thanks,
Pankaj.
David Mossakowski <[EMAIL PROTECTED]> wrote:
There is no notion of 'client is no longer using the services' because once
every request is over you can say that 'client is no longer using services'.
It doesn't much matter (except for the session timeout) if the client makes
another request 5 or 5 hours later.
So, yes, the only way to 'fix' it is to set a time-limit for a session being
inactive. Other thing to do is not to tie any connections to external
resources to the client. Use connection pooling.
As for time out period of your session. This varies depending on what you
do.
For example my web-based e-mail account has unlimited time (it probably isn't
a
servlet but just to illustrate). I can start it today and have the page open
overnight, come back next morning, click get mail and it works. But for
online
trading or banking you would probably set the time out to less than infinity.
dave.
"Gupta, Lokesh" wrote:
> So what are the possible ways for you to detect on the server side that the
> client is not longer using the services. Is that usually done using some
> kind of a time-limit since the last hit on the servlet? If yes, are there
> any recommendations regarding what these time-limits should be?
>
> Thanks,
>
> Lokesh
>
> -----Original Message-----
> From: David Mossakowski [mailto:[EMAIL PROTECTED]]
> Sent: Wednesday, November 17, 1999 10:26 AM
> To: [EMAIL PROTECTED]
> Subject: Re: How to know a brower closed
>
> There is no way to know that.
>
> To release resources use HTTP binding listener and implement the unbind
> method. There you can release the resources because when the session is
> expired this method is called.
>
> dave.
>
> Joe Lei wrote:
>
> > Hi there
> >
> > is it possible to notify a servlet from the client side (using
> JavaScript/applet to servlet communication or else) when the user close the
> brower (without explicitly logout) so that the clean up process, like
> closing db connection, invalidating session object etc. can be triggered.
> >
> > If there're any alternative, pls suggest. Thx
> > Joe
> >
> >
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> --
> David Mossakowski [EMAIL PROTECTED]
> Programmer 212.310.7275
> Instinet Corporation
>
> "I don't sit idly by, I'm planning a big surprise"
>
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--
David Mossakowski [EMAIL PROTECTED]
Programmer 212.310.7275
Instinet Corporation
"I don't sit idly by, I'm planning a big surprise"
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