Re: Notification when HTTP client aborted connection?

2002-10-28 Thread Graham King 
 If you try and write to a closed socket (i.e. if they have closed their browser / moved to a 
different site / etc) you get an IOException, so you could keep writing a little bit, as suggested, 
and catch the IOException.

 If it is a long long query you might want to allow the user to kick it off and get sent an email 
with a link to the results when they are ready. Just an idea.

 Graham.

Robert Parker wrote:

Not sure if this will work, but it may be worth a look...

Could you setup a multi-part response such that say every 15 secs you send
back a progress indicator. If you did this and the client has
'disconnected', perhaps you will get an exception indicating that the socket
is broken implying to kill the big query

-Original Message-
From: Steve Parkinson [mailto:stevepnscp@;yahoo.com]
Sent: Sunday, 27 October 2002 7:25AM
To: [EMAIL PROTECTED]
Subject: Notification when HTTP client aborted connection?


We have some servlets which may potentially create
long-lived database searches, data mining, etc. If the
user is willing to wait for the servlet to complete,
everything is good, but if they press 'stop', visit
another page, or otherwise close the connection to the
webserver, we want to get notified. This way, we can
abort the database connection, so the database isn't
being used to run unnecessary searches.

First, is there a facility in the API for a servlet to
set up a listener, so the servlets gets notified when
the servlet container has lost the connection? 

Secondly, is anyone aware of any webserver
implementation which triggers the notification?

It seems that this would be an obvious kind of
feature, but doesn't seme to be implemented. I also
asked on the Sun Java Servlet forum, but no one seems
to have any idea.

Thanks
Steve




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RE: Notification when HTTP client aborted connection?

2002-10-26 Thread Robert Parker 
Members Equity Email System
Not sure if this will work, but it may be worth a look...

Could you setup a multi-part response such that say every 15 secs you send
back a progress indicator. If you did this and the client has
'disconnected', perhaps you will get an exception indicating that the socket
is broken implying to kill the big query

-Original Message-
From: Steve Parkinson [mailto:stevepnscp@;yahoo.com]
Sent: Sunday, 27 October 2002 7:25AM
To: [EMAIL PROTECTED]
Subject: Notification when HTTP client aborted connection?


We have some servlets which may potentially create
long-lived database searches, data mining, etc. If the
user is willing to wait for the servlet to complete,
everything is good, but if they press 'stop', visit
another page, or otherwise close the connection to the
webserver, we want to get notified. This way, we can
abort the database connection, so the database isn't
being used to run unnecessary searches.

First, is there a facility in the API for a servlet to
set up a listener, so the servlets gets notified when
the servlet container has lost the connection? 

Secondly, is anyone aware of any webserver
implementation which triggers the notification?

It seems that this would be an obvious kind of
feature, but doesn't seme to be implemented. I also
asked on the Sun Java Servlet forum, but no one seems
to have any idea.

Thanks
Steve




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information contained in this e-mail or any attachments. If you have

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Re: Notification when HTTP client aborted connection?

2002-10-26 Thread David Scott 
Steve Parkinson wrote:


We have some servlets which may potentially create
long-lived database searches, data mining, etc. If the
user is willing to wait for the servlet to complete,
everything is good, but if they press 'stop', visit
another page, or otherwise close the connection to the
webserver, we want to get notified. This way, we can
abort the database connection, so the database isn't
being used to run unnecessary searches.

First, is there a facility in the API for a servlet to
set up a listener, so the servlets gets notified when
the servlet container has lost the connection? 

Secondly, is anyone aware of any webserver
implementation which triggers the notification?

It seems that this would be an obvious kind of
feature, but doesn't seme to be implemented. I also
asked on the Sun Java Servlet forum, but no one seems
to have any idea.

Thanks
Steve




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Notification when HTTP client aborted connection?

2002-10-26 Thread Steve Parkinson 
We have some servlets which may potentially create
long-lived database searches, data mining, etc. If the
user is willing to wait for the servlet to complete,
everything is good, but if they press 'stop', visit
another page, or otherwise close the connection to the
webserver, we want to get notified. This way, we can
abort the database connection, so the database isn't
being used to run unnecessary searches.

First, is there a facility in the API for a servlet to
set up a listener, so the servlets gets notified when
the servlet container has lost the connection? 

Secondly, is anyone aware of any webserver
implementation which triggers the notification?

It seems that this would be an obvious kind of
feature, but doesn't seme to be implemented. I also
asked on the Sun Java Servlet forum, but no one seems
to have any idea.

Thanks
Steve




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