Re: Real time data display in a struts based application.

[Adam Ruggles]

The difference between using AJAX and just refreshing a page is a well 
designed AJAX application sends over just the information that is 
needed.  For a JSP/HTML page refresh you're sending more data over the 
line.  The key here is a well designed AJAX application.

Maya menon wrote:
Thank you both for your responses.
   
  So AJAX is the technique I should refer. Anyone know of any examples / somethings.
   
  Also, my colleague asked me this question when I talked to him about a "timed AJAX event". Why cant we simply refresh the jsp page ? Why should we use AJAX ? so, whats the real advantage of using an AJAX timed event to a normal JSP/HTML refresh ?
   
  Maya

Musachy Barroso <[EMAIL PROTECTED]> wrote:
  The div tag when used on the ajax theme, has a timer that will make it
refresh its content from the url specified in the "href" attribute, examples
available in showcase and here:

http://struts.apache.org/2.x/docs/ajax-tags.html

musachy

On 2/28/07, Frank W. Zammetti wrote:
  
Well, if you can live with not literally "pushing" to the client, this is
the sort of application AJAX was made for. Have a timed event, every few
seconds maybe, whatever your tolerable definition of "real time" is, that
makes and AJAX request to check for new data and display it when found.
Pretty easy.

Have a peak at the AjaxParts Taglib (APT) in Java Web Parts (JWP):

http://javawebparts.sourceforge.net

http://javawebparts.sourceforge.net/javadocs/javawebparts/ajaxparts/taglib/package-summary.html

The benefit is that it will allow you to do this, since it has a timed
AJAX event function, and will save you from having to write any Javascript
yourself (most likely).

Whether you go with APT or not, AJAX is probably the first thing you want
to look at.

Frank


--
Frank W. Zammetti
Founder and Chief Software Architect
Omnytex Technologies
http://www.omnytex.com
AIM/Yahoo: fzammetti
MSN: [EMAIL PROTECTED]
Author of "Practical Ajax Projects With Java Technology"
(2006, Apress, ISBN 1-59059-695-1)
Java Web Parts - http://javawebparts.sourceforge.net
Supplying the wheel, so you don't have to reinvent it!

On Wed, February 28, 2007 3:54 pm, Maya menon wrote:
    
All,

Have a design issue here. We have a web based application and have
      
2000
    
concurrent users. The requirement is: when new data comes on Oracle
database for users this data has to be sent to the online users on a
real time basis. Someway, the real time data needs to be pushed to the
users without the client doing a reload/refresh etc.

What technologies can be used here ? Can anyone provide me some
suggestions ?

The users login to the application using a web page, this is a web
      
based
    
J2ee application using struts, Oracle database.

Thanks,
Maya


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