There are many ways to handle it, but you need to consider how to present it to your users and other constraints specific to your environment.
In one GWT app, I did nothing to detect client-side inactivity. I used the Google UserService to detect session expiration on the server side whenever there was a message from the client (and I wrote the code to handle those case). The Google UserService lets you see the policy on how long the sessions stay active, but it is often measured in days. So, it did not seem worthwhile to write code to handle the session expiration. Here's a link to a client-side that attempts to detect session expiration: http://gwt-ext.com/forum/viewtopic.php?t=1682 The code uses GWT-Ext widgets, but can be easily adapted to use standard GWT widgets. Some servers consider a client's session inactive if they have not received a message from the client in some period of time (as shown in the example). The example code can be adapted to periodically send a "ping" message to the server instead of just detecting messaging inactivity. You probably do NOT want clients sending "pings" to you application if it is deployed on Google's servers, since the pings will probably count against you request quota. Another thing to consider is that if your application is working correctly, the user may not even be aware when messages are exchanged between client/server. For this reason, you may want to introduce some other means of tracking inactivity. Lastly, you need to determine how you want session expiration presented to your user. My users did not care for the way the GWT-Ext example informed the user (particularly if they missed the refresh prompt). My solution was to keep the user at the same screen and present a dialog box informing them when their session timed out. Upon acknowledging the message, they were sent to another place. I tried to hit the highlights of things for you to consider regarding session expiration, but I think you need to tailor your solution for your environment. Regards, Rick -- You received this message because you are subscribed to the Google Groups "Google Web Toolkit" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.
