Do you have a simple sample of this Steve? If so, I would sure like to
see it.
Michael McGrady
Steve Kirk wrote:
Not sure if this is stating the obvious, or this is the approach you've
already taken, but it's not necesary to refresh the whole page that is
displaying your data every few seconds. You can have an invisible frame
that runs the JS timer that you describe. That frame could have
src="/mywebapp/DataUpdateCheck" which is a servlet that returns just a
simple js function - if there is new data, the function reloads it into the
visible frame, otherwise it reloads itself after a couple of seconds to
check for more data.
-----Original Message-----
From: Steve Kirk [mailto:[EMAIL PROTECTED]
Sent: Tuesday 19 October 2004 12:41
To: 'Tomcat Users List'; [EMAIL PROTECTED]
Subject: RE: Push-Server with Tomcat
Seems to me that browsers are inherently "pull" technology
because at the
basic level they send a single request and await a single
response to it.
You can't push stuff at them that they haven't requested.
Hence why you
have to use an approach like your javascript - which, by the
way, I have
used in the past in a web-based control system without
problems - it might
not feel that elegant, but it does work.
I would think that to get a true push approach you would have
to extend the
browser capabilities using a plugin of some sort, e.g. java
applet / activex
/ etc. Never tried this myself though so can't comment if
this will solve
it.
-----Original Message-----
From: Harald Henkel [mailto:[EMAIL PROTECTED]
Sent: Tuesday 19 October 2004 09:51
To: Tomcat Users List
Subject: Push-Server with Tomcat
Hello everybody.
Is it possible (with Tomcat) to write an application that,
once startet
will send a new HTML page to a client, genereated using changed data
from a database ?
What I want to do is using oracle alerts to alert a waiting Tomcat
thread of changed data, let it collect the data and generate
one or more
HTML pages sent to different clients, i.e. a specific frame in the
browser on the client.
Or would I have to have a Java app runing in that frame ?
At the moment I'm doing this using a JavaScript timer on the client
requesting a new page for that frame every couple of seconds,
but for this application push would really be better.
With kind regards,
Harald Henkel
--
Harald Henkel
GS automation GmbH
Winterstra�e 2
82223 Eichenau
Germany
Tel: + 49-8141-35 731-37
Fax: + 49-8141-35 731-38
Mobile: + 49-178-7829126
e-mail: [EMAIL PROTECTED]
Web: www.GS-automation.DE
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