Global Update events/@Observe

[dahm]

Hi,

consider the following situation:
I've got a page and a bean containing a @DataModel list. You can click on the list
and edit one of the entries. Now the list may need an update, because
the contained data may have changed. The user is free to navigate to
this page at any time, so the data needs always to be accurate.

So I raise every time an event when a data item has been changed
using raiseEvent(). The list SSB accordingly
contains a method annotated with @Observe() that resets the list.

This works fine within the same user session. However I'd like to have
something like a global raiseEvent/@Observe that will forward this event
to all current sessions, so that all active users always see the most current
data.
(I'm aware that there still may be a "lost update" problem :-)

I don't know how this can be with Seam.

If this a feature request, I'd suggest that you can scope an event to a
certain ScopeType which is by default the session context.

Cheers
Markus

[fernando_jmt]

What I did was to add somthing like this:

<page view-id="/list.xhtml" action="#{listBean.resetList()}">


And in the resetList() I am reseting the list, in order to refresh the data using the @Factory which updated the list for the respective @DataModel

[dahm]

Thanks, that is a good idea!

I'm generating a lot of code and thus can not always maintain pages.xml
properly in that way.

I still think the feature I proposed would be a "nice to have" in order
to propagate events...

Cheers
Markus

[gavin.king]

To share state between "all sessions" you must use application context (or, in a cluster, the PojoCache). There is no way to handle an event in "all sessions" according to the servlet spec.

[dahm]

APPLICATION scoped events are exactly what I need :-)

Cheers
Markus