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response without request

ankur rathi
Ranch Hand

Joined: Oct 11, 2004
Posts: 3830
Hi,

Suppose there are number of clients (browsers) connected with the server (one to one communication is happening between each client and server).

Now some time what I want to achieve is, if one client send a request, response of that request should be sent to all the clients.

I am sure, response without request is not possible so I guess, and I will need dummy request from all the clients to send that response�

It�s happening but �timing� is BIG issue. I want other clients to send dummy requests only when one of the clients has sent an �original request� or I should ignore all the dummy requests until I get an �original request� from any of the client...

Second option seems possible.

Please post your views on the same.

Thanks.
[ April 27, 2007: Message edited by: Bear Bibeault ]
Ben Souther
Sheriff

Joined: Dec 11, 2004
Posts: 13410

HTTP is a stateless protocol.

Once a client makes a reqeust and the server responds, the connection is severed. Except for this brief instant while this is going on, there are no clients connected to the server.


Java API J2EE API Servlet Spec JSP Spec How to ask a question... Simple Servlet Examples jsonf
Ravinder Rana
Greenhorn

Joined: Dec 07, 2006
Posts: 19
You can do this using server push. For more information on server push visit Push Servlet or do a google search. I have used server push a long time back in a project. If you have any doubt, regarding implementation, please get back to me.
William Brogden
Author and all-around good cowpoke
Rancher

Joined: Mar 22, 2000
Posts: 12786
    
    5
All "clients" will have to be polling the servlet to see if new information is available. Looks like a job for Javascript to me - possibly the AJAX or similar approach.

Bill
ankur rathi
Ranch Hand

Joined: Oct 11, 2004
Posts: 3830
Originally posted by Ben Souther:
HTTP is a stateless protocol.

Once a client makes a reqeust and the server responds, the connection is severed. Except for this brief instant while this is going on, there are no clients connected to the server.


Sorry for delaying in follow up.

And one more sorry but I didn't quite understood this? Container runs many threads at the same time, each serving one client. So all threads can use a common place to talk...

And moreover how it is related to my question?
:roll:
ankur rathi
Ranch Hand

Joined: Oct 11, 2004
Posts: 3830
Originally posted by William Brogden:
All "clients" will have to be polling the servlet to see if new information is available. Looks like a job for Javascript to me - possibly the AJAX or similar approach.

Bill


Exactly, I thought the same. So I said "dummy request". It's kind of pulling only...
[ May 07, 2007: Message edited by: ankur rathi ]
ankur rathi
Ranch Hand

Joined: Oct 11, 2004
Posts: 3830
Hi,
Here is one sample of implementation:

http://gossips.s42.eatj.com/login.jsp

You can use any of the following username and password:

temp1/temp1
temp2/temp2
temp3/temp3
temp4/temp4
temp4/temp5

 
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