Detach Model Objects when user leaves page
Hi, i have a list view with content from a Repository that is input to a wicket DataProvider with ModelObject. I get the content of the repository from a webservice. I don't want to load the data from the webservice after each request, but the model gets detached after each request and accordingly my Repository (which is connected to the webservice) is empty after each request (because its objects are set to null in the detachment process). Now, is there a way to influence a LoadableDetachableModel in a way that it gets detached after the user leaves the page/accesses another page. I tried to overwrite the detach-method but without success. As a workaround i'm using the session to store my repository but then i don't have an indication when the data isn't needed any more. I think about time based expiration of session data (time based cache mechanism like in guava library), but i think this is rather cumbersome. Detaching the model object after the user leaves the page would be more elegant. Thanks for any suggestions or hints how you fixed this scenario. -- View this message in context: http://apache-wicket.1842946.n4.nabble.com/Detach-Model-Objects-when-user-leaves-page-tp4649977.html Sent from the Users forum mailing list archive at Nabble.com. - To unsubscribe, e-mail: users-unsubscr...@wicket.apache.org For additional commands, e-mail: users-h...@wicket.apache.org
Re: Detach Model Objects when user leaves page
How would you notice if the user leaves the page? If you have only Wicket controlled Links on your page then you could null your Repository data in their onclick() implementation (if you do a setResponsePage(someOtherPage). If there's also non-Wicket links on your page, well, you would probably have to use some JS magic (+ AJAX) to react upon page leave event. I don't like either of those solutions but would prefer a cache including expiry strategy instead. About how much data are we talking here? Isn't it possible to do some kind of paging or do you need to fetch the whole dataset? -Tom On 14.06.2012 at 16:57 brazz wrote: Hi, i have a list view with content from a Repository that is input to a wicket DataProvider with ModelObject. I get the content of the repository from a webservice. I don't want to load the data from the webservice after each request, but the model gets detached after each request and accordingly my Repository (which is connected to the webservice) is empty after each request (because its objects are set to null in the detachment process). Now, is there a way to influence a LoadableDetachableModel in a way that it gets detached after the user leaves the page/accesses another page. I tried to overwrite the detach-method but without success. As a workaround i'm using the session to store my repository but then i don't have an indication when the data isn't needed any more. I think about time based expiration of session data (time based cache mechanism like in guava library), but i think this is rather cumbersome. Detaching the model object after the user leaves the page would be more elegant. Thanks for any suggestions or hints how you fixed this scenario. - To unsubscribe, e-mail: users-unsubscr...@wicket.apache.org For additional commands, e-mail: users-h...@wicket.apache.org
Re: Detach Model Objects when user leaves page
Hi Thomas, thanks for your reply. Data is not that much, but i think it's no good practice to have data in memory that is not used any more. So i'd like to have a general solution to this. Your right, the user could leave the page by any means. But for me it would be enough to discard the data when the user goes to one of my (other) wicket pages. Maybe i should have a look at the seam framework which adresses conversation scope... -- View this message in context: http://apache-wicket.1842946.n4.nabble.com/Detach-Model-Objects-when-user-leaves-page-tp4649977p4649982.html Sent from the Users forum mailing list archive at Nabble.com. - To unsubscribe, e-mail: users-unsubscr...@wicket.apache.org For additional commands, e-mail: users-h...@wicket.apache.org
Re: Detach Model Objects when user leaves page
Thanks for the link! I think i will give this one a try: https://www.42lines.net/2011/11/15/integrating-cdi-into-wicket/ -- View this message in context: http://apache-wicket.1842946.n4.nabble.com/Detach-Model-Objects-when-user-leaves-page-tp4649977p4649990.html Sent from the Users forum mailing list archive at Nabble.com. - To unsubscribe, e-mail: users-unsubscr...@wicket.apache.org For additional commands, e-mail: users-h...@wicket.apache.org
