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Using RMI with HTTP

Posted on 1998-08-31
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I am trying to develop a whiteboard applet that will communicate with HTTP.  is RMI a good solution to this?

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Question by:callapm
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by:callapm
ID: 1223065
if not, anyone have any better  solutions?


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diakov earned 20 total points
ID: 1223066
Hi 'callapm',

As far as I remember, JavaRMI supports HTTP tunneling for its communications. But it is not very elegant, since the callback mechanism is not working (or is emulated with very slow effeciency).
I believe that the best solution for what yoy want to accomplish is a CGI web server program, and an client applet that connects to it. You have to develop a simple messaging system over the HTTP using CGI calls.
Since HTTP does not support callbacks (the server cannot make a unrequested call to the client), the clients have to regularly check by a call whether there are new messages for them on the server. Basically, for this you need three routines on the server. CONNECT - returns and ID to the applet, SEND - sends a message and ID, and RECEIVE - get as a parameter unique ID and return the pending messages for this user. Over such a messaging system you can build a content synchronization messaging protocol for your whiteboard.

The CGI program could be written on some scripting language or as a Java Servlet, or in C, depends on your knowledge and on the Web server software. May be full Java solution is a good idea.

Hope this will help.

Cheers,
  Nik
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