Hello,
I'm really trying to get my arms around how the Seam conversations work and as
soon as I think I understand it, I get some behavior that doesn't match my
assumptions.
Currently, I am struggling with the following:
- I have a page we call a "Manager Overview". This page pulls in data from
various tables into little summary "portlets" (fancy divs). One of these is a
list of up-coming "Reminders".
- The backing bean is a Stateful Session Bean, conversation scoped. It has an
@Create method with an @Begin annotation to start a long running conversation.
We do this to cache the data presented on the page while its being used.
- The user can click the "Add" button to add a new reminder. This link calles
a ReminderBean.add action method. This method is annotated with
@Begin(nested=true).
- The page for adding a reminder is displayed and has Cancel and Save buttons
that call ReminderBean.cancel and ReminderBean.save respectively. Both of
these methods are annotated with @End
- The save method, before returning a String, does this:
events.raiseTransactionSuccessEvent("REMINDER_UPDATED");
- Back in the ManagerBean, we have the @Factory method for the Reminders also
annotated with @Observer for the above event.
- The cancel method, also annotated with @End just returns a string to redirect
back to the calling page, in this case the manager overview.
So, here's what I see:
1. Browse to overview (manager.seam?cid=9)
2. Click add to add a new reminder (editreminder.seam?cid=10&clr=true)
3. Fill in data and click save (manager.seam?cid=10&parentConversationId=9)
4. Newly added row appears in list and my log file indicates the observer
method was called.
5. Now I click add again (editreminder.seam?cid=11&clr=true)
6. This time I click Cancel (manager.seam?cid=11&parentConversationId=9)
7. Row that was added is now gone.
I suspect its something to do with transactions and/or hibernate caching or
perhaps just my poor usage of conversations.
Is this even the right usage for conversations? i.e. using it to cache data and
updating that data using @Observer from nested conversations?
Any help/insight is greatly appreciated.
Thanks,
Mark
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