AW: [opencms-dev] Information Push in OpenCMS ?

[Riad Shalaby]

Hi

As far as i know a push over HTTP is not possible. Think about the usual
Firewall/Proxy Configurations there is no way to initiat a TCP
connection from the side of the webserver.

A common way to overcome these limitation is to use a meta tag.

e.g.:

<meta http-equiv=Refresh content="10;URL=<%= recallHref %>">

this will let the browser refresh the page every 10 seconds. You can use
it even in a hidden frame.

hope that helps
    Riad Shalaby



> Betreff: [opencms-dev] Information Push in OpenCMS ?
> 
> 
> Hi,
> 
> OpenCMS / Tomcat works over HTTP and therefore implement the 
> HTTP request / response pattern which is like an information 
> pull over the internet. For this I would for example have a 
> JSP in OpenCMS which is requested by a browser, these JSP is 
> calling some java beans and the information output is put as 
> a HTML and sent back to the browser. Fine! But...
> 
> ...how can I implement information push? What do I have to do 
> (methodological,
> technical) to let my Java software push a website to a 
> browser? I know this is a very general description but I hope 
> you understand what I mean.
> 
> To be more precise, but I do not want to restrict your 
> answer, I could also think of these variant. A JSP site is 
> requested by a browser. Every few seconds, the Java bean is 
> producing a new updated version of this output website. How 
> would I do this? I am interesting in that way, that the 
> business logic is initiating the informaton push to the client.
> 
> If somebody know a more generic appraoch, please let me know? 
> Is there a kind of architecture which supports this kind of 
> programming? I think the main problem is HTTP, since HTTP was 
> not designed for this way of information provision.
> 
> Any help, examples, links etc. would be highly appreciated, Ralf
> 
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