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:tomcat-user@(protected)]
>>Sent: Tuesday 19 October 2004 12:41
>>To: 'Tomcat Users List'; h.henkel@(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:h.henkel@(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: H.Henkel@(protected)
>>>Web:   www.GS-automation.DE
>>>
>>>
>>>    
>>>
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