Hi,
I'm trying to implement a standard mechanism for providing feedback to
users after they perform operations such as your standard CRUD
operations. The idea is that they click a link such as "delete" and
it performs the operation returns to that page, but with a message
along the top that says "<something> has been deleted". The vast
majority of the users state is stored in the page's activation
context, but I don't want to store the feedback message there as it
ends up complicating the context processing across all of the
applications pages.
Storing the message using @Persist(PersistenceConstants.FLASH) seems
like the way to go. However, because many of my operations are used
across multiple pages I decided to implement these operations as
separate pages that perform the operation and return to the caller.
Here is an example:
public class DeleteItem {
@Inject
private ItemDao itemDao;
@Inject
private PageRenderLinkSource pageLinkSource;
@Inject
private ComponentSource componentSource;
@CommitAfter
public Object onActivate( long id, String page ) {
return deleteItem( id, page, null );
}
@CommitAfter
public Object onActivate( long id, String page, String context ) {
return deleteItem( id, page, context );
}
private Object deleteItem( long id, String page, String context ) {
itemDao.delete( id );
// Component comp = componentSource.getPage( page );
// if( comp instanceof FlashMessagePage ) {
// ((FlashMessagePage)comp).setFlashMessage( "Bah Humbug!" );
// }
// return ???;
return context != null
? pageLinkSource.createPageRenderLinkWithContext( page, context )
: pageLinkSource.createPageRenderLink( page )
;
}
}
The crux of my problem is in the commented code. I need to return a
specific page (comp) which has had flash persisted page properties set
on it, but I also need to set the context for that page. However, all
mechanisms for creating a link with a passivation/activation context
(that I can see) only accept a page name (String) or the class object
of the page (Class). How do I return a specific page instance with an
activation context?
In the above code, it would be nice if I could do the following:
private Object deleteItem( long id, String page, String context ) {
itemDao.delete( id );
Component comp = componentSource.getPage( page );
if( comp instanceof FlashMessagePage ) {
((FlashMessagePage)comp).setFlashMessage( "Bah Humbug!" );
}
return context != null
? pageLinkSource.createPageRenderLinkWithContext( comp, context )
: pageLinkSource.createPageRenderLink( comp )
;
}
Thanks,
Pete Poulos
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