Hi Bernard and Mike, According to https://cwiki.apache.org/WICKET/best-practices-and-gotchas.html#BestPracticesandGotchas-AnonymousInnerclasses sharing models could eventually lead to Out of memory error.
Holding a page reference in an instance field that points to another page looks the same but it is doesn't seems to be a problem. What's the difference? Regards, Rik On 16 mei 2010, at 04:39, Michael O'Cleirigh wrote: > Hello, > > I'm not sure on the answer to your question about the anonymous inner class > but in general sharing models between pages can be a bad idea. > > The memory issues comes into play if the IModel is like Model and the > contained object is not transient (it is serialized as part of the page). > > While Pages are serialized each page is serialized independently so on page > reload the IModel from the first page is no longer the same object instance > as the IModel from the second page. At deserialization time the > page1.model.getObject().equals page2.model.getObject() but > page1.model.getObject() != page2.model.getObject(); so any changes to either > model are not shared between then. > > This is not a problem if the model is loadable since the memory of the page > it is contained in doesn't matter as the value is loaded from the backend db > or some other independent data source like the httpsession, or with > wicketApplication. > > You can see the same effect if you try and share a model between a panel and > a ModelWindow that uses a PageCreator > > Hope this helps, > > Mike >> Hi, >> >> Can someone explain me why it is a memory issue when an instance of an >> anonymous IModel class is passed to another page to be shared, but it seems >> to be no problem when a page reference is passed to another page and is put >> in an instance field (for example to be used in a button to navigate back to >> previous page)? >> >> Many thanks. >> >> Regards, >> Rik >> >> >> >> --------------------------------------------------------------------- >> To unsubscribe, e-mail: users-unsubscr...@wicket.apache.org >> For additional commands, e-mail: users-h...@wicket.apache.org >> >> > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: users-unsubscr...@wicket.apache.org > For additional commands, e-mail: users-h...@wicket.apache.org > --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@wicket.apache.org For additional commands, e-mail: users-h...@wicket.apache.org
