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Full Discussion: can I use tomcat server for my chatting application?
Special Forums IP Networking can I use tomcat server for my chatting application? Post 302280164 by cbkihong on Monday 26th of January 2009 08:16:56 AM
Old 01-26-2009
It depends on how you want users to chat. Implementing a (1) 100% Web-based chatroom (no applet), or (2) users use applet from a Web page to chat? Or (3) users have dedicated clients (e.g. swing GUI) for chat?

I hope this is not college assignment. We don't allow posting these kind of questions here. But I will not post any code anyway as they are not something you can do with just a few lines of code and you should try to explore on your own.

(3) The GUI client can support any client-server socket protocol so this is the most traditional way to do this
(2) An applet can have limited networking capability so you can mostly use your own protocol as in case (3)
(1) Without applet, immediate refresh of message on Web page may be triggered by AJAX. You can use Tomcat (or even application server such as JBoss) to host an application server with state managed on it. However, to avoid excessive AJAX polling, you can use Jetty instead of Tomcat, that supports "continuations" so that it can push update to client instead of requiring polling from client side. Actually, the Jetty distribution has an example that exactly demonstrates how to create a chatroom using this method.
 

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LEARN ABOUT CENTOS

firewall-applet

FIREWALL-APPLET(1)						  firewall-applet						FIREWALL-APPLET(1)

NAME

       firewall-applet - firewalld applet

SYNOPSIS

       firewall-applet [OPTIONS...]

DESCRIPTION

       firewall-applet is a tray applet for firewalld.

OPTIONS

       firewall-applet does not support any special options. The only options that can be used are the general options that Gtk uses for Gtk
       application initialization. For more information on these options, please have a look at the runtime documentation for Gtk.

       The following options are supported:

       -h, --help
	   Prints a short help text and exists.

GSETTINGS

       firewall-applet has additional settings to adapt the look and feel. The used backend depends on the distribution and can be either dconf or
       GConf. The path to the settings is org.fedoraproject.FirewallApplet. You can use dconf-editor or gconf-editor to see and modify them.

       The following settings are supported:

       notifications
	   The applet shows notifications if enabled. This setting can be enabled also in the applet with the "Enable Notifications" checkbox in
	   the right mouse menu.

	   This setting defaults to false.

	   If notifications are shown for these actions if enabled:

	   o   Connection to firewalld established

	   o   Connection to firewalld lost

	   o   Firewall has been reloaded

	   o   Default zone has been changed

	   o   Panic mode has been enabled or disabled

	   o   Activation, deactivation or change of zones bound to interfaces

	   o   Activation, deactivation or change of zones bound to sources addresses

       show-inactive
	   Show applet also if firewalld is not running. If firewalld has been stopped or is not running the applet will be hidden and not visible
	   in the applet tray. Enable this setting to see the applet all the time for example to be sure that the firewall is active.

	   This setting defaults to false.

       shields-up
	   The shields-up zone name to be used if shields-up is enabled.

	   This setting defaults to 'block'.

       shields-down
	   The shields-down zone name to be used if shields-up has been deactivated again.

	   This setting defaults to 'public'.

       blink
	   If enabled, the applet icon blinks in these cases:

	   o   Connection to firewalld lost

	   o   Panic mode has been enabled or disabled

	   This setting defaults to false.

       blink-count
	   The number of blinks if blink is enabled.

	   This setting defaults to 5.

SEE ALSO

       firewall-applet(1), firewalld(1), firewall-cmd(1), firewall-config(1), firewalld.conf(5), firewalld.direct(5), firewalld.icmptype(5),
       firewalld.lockdown-whitelist(5), firewall-offline-cmd(1), firewalld.richlanguage(5), firewalld.service(5), firewalld.zone(5),
       firewalld.zones(5)

NOTES

       firewalld home page at fedorahosted.org:
	   http://fedorahosted.org/firewalld/

       More documentation with examples:
	   http://fedoraproject.org/wiki/FirewallD

AUTHORS

       Thomas Woerner <twoerner@redhat.com>
	   Developer

       Jiri Popelka <jpopelka@redhat.com>
	   Developer

firewalld 0.3.9 														FIREWALL-APPLET(1)
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