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broadcast a message to all logged in users

 
Greenhorn
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How can I broadcast a message to all logged in users, when my system goes for maintenance. During Maintenance, my Database server will be down and webserver will be up. I am using IIS as webserver, ServletExec as Servlet Engine and JSP.
Thanks in Advance,
Rajesh Jhaver
 
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you cant - HTTP does not support broadcast. You can deploy such a thing as an applet by polling the server for its status and setting the status to show this. alternatively, you can write your application in such a way that it detects the maintenance and imposes a helpful message if the resource is not available
 
Ranch Hand
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Rajesh,
Can you grab their email addresses when they log in? So or your server can send them an email before you shut down.
 
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