On Mar 30, 2009, at 13:18, David Avendasora wrote:
This is the approach I was thinking of. Have the client keep track
of how long since the last server communication (I have no idea how
to do that...) and set a timer based on the session timeout value.
It's only job would be to give the user a few minutes warning to
finish what they were working on, extend the session (if possible, a
ping as you describe below would be perfect) or quit.
Right now this isn't a huge issue as most users are used to the
concept of a Web session timing out without warning so they seem to
be able to grasp that a desktop application can do the same. Some
websites warn you they are about to timeout, but not all.
I implemented this too, it is in WOJCKit, available at:
http://web.mac.com/flor385/eSwamp/software/files/WOJCKit.zip
The above discussed functionality is in the
org.wojc.client.SessionTimeoutTracker class. It does not provide
actual handling, as that can differ from app to app, but allows you to
easily setup session timeout tracking, and the execution of an
arbitrary action X amount of time before the session will expire.
Works as far as I have tested it.
F
p.s. - here is also an adaptation of the code I use in one of my apps
as a reaction to a timeout approaching, as an example.
public static void showSessionTimeoutMessage(int allowedTimeMinutes){
// TODO internationalize
// prepare values to be displayed in the dialog
String title = "Connection will expire...";
String message = LocUtilities.fillUp("The connection to the server
will expire in {1} minutes, and the application will quit. Unsaved
changes will be lost.\nWhat to do?",
allowedTimeMinutes);
String quit = "Quit";
String extend = "Refresh connection";
// create the option pane and it's dialog
JOptionPane op = new JOptionPane(message,
JOptionPane.WARNING_MESSAGE,
0, dvisIcon, new Object[]{quit, extend}, quit);
final JDialog dialog = op.createDialog(parentComponent, title);
// schedule automatic closing of the dialog, if still visible
WOJCKitUtil.SCHEDULED_EXECUTOR_SERVICE.schedule(new Runnable(){
public void run(){
if( ! SwingUtilities.isEventDispatchThread())
SwingUtilities.invokeLater(this);
else
if(dialog.isVisible())dialog.setVisible(false);
}}, (allowedTimeMinutes * 60) - 10, TimeUnit.SECONDS);
// make the dialog visible
dialog.setVisible(true);
// what did the user choose?
if(op.getValue() == extend)
RemoteMethodInvoker.ping();
else
System.exit(0);
}
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