Hello all,
this question is not directed solely at Wicket, but extends beyond that to web
app architecture and best practices.
I have been working mostly with the open-session-in-view pattern and Wicket's
loadable detachable models backed with Hibernate or similar ORM for my
applications.
This combination works fairly well until one starts to deal with transient
objects that may at some point become persistent, and have references to other
objects that already are persistent in the database. This object graph composed
of a mix of persistent and transient cannot safely be serialized, nor can
references to transient objects be removed at detach phase as they would then be
lost.
These situations usually arise in AJAX or Wizard-style scenarios. I have dealt
with them in various ways, but have not yet found a way that I am really
satisfied with:
1) always persist objects (undesirable in many cases as it might require you to
drop integrity constraints and do additional filtering when fetching objects
from the database to avoid "incomplete" instances or additional tables and
therefore overhead)
2) clear references to persistent objects and store that information elsewhere
(eg. in the model)
3) avoid setting references to the persistent instances in the transient one to
begin with (and again store IDs or models of selected persistent objects elsewhere)
4) deviate from open-session-in-view pattern on certain pages (may cause you to
run out of database connections or force you to deal with database timeouts etc.)
I don't think I am the only one running into these kinds of issues, so I'd like
to hear which patterns other developers apply or what they consider best practices.
Kind regards,
Edmund
--
Mit freundlichen Grüßen
Edmund Urbani
Liland IT Team
Email: edmund.urb...@lilandit.com <mailto:edmund.urb...@lilandit.com>
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