I do not like the approach but ... client can automatically do request with certain period (from javascript) and if the response indicates that server will go down ... This will not work in the case of unexpected error, but it will work if, for instance, server is planned to go down for maintenace. Anyway, the approach with auxiliary server sounds better to me.
Maros. -----Original Message----- From: Galbreath, Mark [mailto:[EMAIL PROTECTED]] Sent: Wednesday, August 21, 2002 3:08 PM To: [EMAIL PROTECTED] Subject: Re: How to broadcast a message Hello? HTTP is request-response, remember? He can't preemptively respond before receiving a request. -----Original Message----- From: C�dric Viaud [mailto:[EMAIL PROTECTED]] Sent: Wednesday, August 21, 2002 9:01 AM To: [EMAIL PROTECTED] Subject: Re: How to broadcast a message This is to notice users BEFORE the server shutdown. That was the question i understood. But maybe i am wrong. Regards, C�dric ----- Original Message ----- From: "Galbreath, Mark" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Wednesday, August 21, 2002 2:58 PM Subject: Re: How to broadcast a message > Uh, how's he gonna do that while Tomcat is down? > > -----Original Message----- > From: C�dric Viaud [mailto:[EMAIL PROTECTED]] > Sent: Wednesday, August 21, 2002 5:31 AM > To: [EMAIL PROTECTED] > Subject: Re: How to broadcast a message > > > Or maybe, but it is an early idea (my brain is yet sleeping), you could use > a servletFilter if you use Servlet 2.3. > > So your front filter will redirect users to an HTML page whith your message > before processing requests. The filter could do it or not depending on value > in the application context. > > The servletFilter way avoid to modify all your JSPs. You just have to modify > your web.xml to indicate servlet filtering for all yours Servlet/JSP. > > Hope this help, > > regards, > > C�dric > > ----- Original Message ----- > From: "Richard Yee" <[EMAIL PROTECTED]> > To: <[EMAIL PROTECTED]> > Sent: Wednesday, August 21, 2002 6:05 AM > Subject: Re: How to broadcast a message > > > > You could have all of your JSP's check for the presence of an application > > variable. If the variable is found, a JavaScript popup window can be made > > to appear the next time the server sends a response and the appropriate > > message can be displayed. Note that the message will only appear once a > > client makes a request to the server. If a client doesn't send a request > to > > the server between the time that you decide to send the message and the > > time you shut the server down, they won't get a notification. There are > > other things you could possibly do such as run applets on the client's > > browser and have the server send messages to the applets, but I personally > > don't think it is worth the trouble and added overhead. > > > > Regards, > > > > Richard > > > > At 10:41 AM 8/21/2002 +0800, you wrote: > > >Hi all, > > > > > >I have an application running on Tomcat. If I want to shutdown for > > >maintenance. How do I broadcast a message to all the on-line user ? > > >Kindly provide any pointer if possible. > > > > > >Thanks. > > > > > >Regards, > > >KL > > > > > > >___________________________________________________________________________ > > >To unsubscribe, send email to [EMAIL PROTECTED] and include in the > body > > >of the message "signoff SERVLET-INTEREST". > > > > > >Archives: http://archives.java.sun.com/archives/servlet-interest.html > > >Resources: http://java.sun.com/products/servlet/external-resources.html > > >LISTSERV Help: http://www.lsoft.com/manuals/user/user.html > > > > > ___________________________________________________________________________ > > To unsubscribe, send email to [EMAIL PROTECTED] and include in the > body > > of the message "signoff SERVLET-INTEREST". > > > > Archives: http://archives.java.sun.com/archives/servlet-interest.html > > Resources: http://java.sun.com/products/servlet/external-resources.html > > LISTSERV Help: http://www.lsoft.com/manuals/user/user.html > > > > ___________________________________________________________________________ > To unsubscribe, send email to [EMAIL PROTECTED] and include in the body > of the message "signoff SERVLET-INTEREST". > > Archives: http://archives.java.sun.com/archives/servlet-interest.html > Resources: http://java.sun.com/products/servlet/external-resources.html > LISTSERV Help: http://www.lsoft.com/manuals/user/user.html > > ___________________________________________________________________________ > To unsubscribe, send email to [EMAIL PROTECTED] and include in the body > of the message "signoff SERVLET-INTEREST". > > Archives: http://archives.java.sun.com/archives/servlet-interest.html > Resources: http://java.sun.com/products/servlet/external-resources.html > LISTSERV Help: http://www.lsoft.com/manuals/user/user.html > ___________________________________________________________________________ To unsubscribe, send email to [EMAIL PROTECTED] and include in the body of the message "signoff SERVLET-INTEREST". Archives: http://archives.java.sun.com/archives/servlet-interest.html Resources: http://java.sun.com/products/servlet/external-resources.html LISTSERV Help: http://www.lsoft.com/manuals/user/user.html ___________________________________________________________________________ To unsubscribe, send email to [EMAIL PROTECTED] and include in the body of the message "signoff SERVLET-INTEREST". Archives: http://archives.java.sun.com/archives/servlet-interest.html Resources: http://java.sun.com/products/servlet/external-resources.html LISTSERV Help: http://www.lsoft.com/manuals/user/user.html ___________________________________________________________________________ To unsubscribe, send email to [EMAIL PROTECTED] and include in the body of the message "signoff SERVLET-INTEREST". Archives: http://archives.java.sun.com/archives/servlet-interest.html Resources: http://java.sun.com/products/servlet/external-resources.html LISTSERV Help: http://www.lsoft.com/manuals/user/user.html
