Hello Steven,
Steven Marcus wrote:
Hello all,
I am new to Chiba and have been reading the great docs and generally
trying things out.
Thank you for releasing Chiba to the world and especially taking
things like the conformance status reports so seriously.
I read the cookbook, which explains a great deal about how things are
done and where to extend. Thank you again.
In the XForms specification, the state of a specific form is defined
entirely by the user's xml instance data being submitted. Is this
still the case with Chiba?
well, no. i don't think the spec says something like that. - while this
might considered true for the final submit result there are especially
the MPEs (Model Item Properties) that represent the state of the
instance along with its data. these properties say if a data-item is
readonly or readwrite, whether it's relevant or not or valid or not at a
given time. so there's much more around than the naked instance data to
express the whole state of a form at runtime. every single node in the
instance has a set of these properties attached.
That is, does the browser hold the entire user state of the xform
session, and the ServletAdapter/ChibaBean in the servlet's user
session function merely as a redundant cache of that data? If that is
the case the ServletAdapter/ChibaBean could theoretically be
thrown-away and reconstructed each time the user POSTs the data?
so, for the above reasons the browser actually does not hold all this
state information (at least not for now ;) or at least not in a easily
reconstruable form. we'll start working on scripted browser support
(which will incorporate such state-transfer) after 1.0 has been rolled
out. everyones invite to take part ;)
Why do I ask? I am thinking of a clustered implementation where it
might not be possible/desirable to have the user's browser bound to a
particular web server.
this topic has been repeatedly discussed on this list. to a certain
degree it should be possible to use Chiba in a clustered environment -
see review the older messages on this topic. better support will come in
the future but it'll be still some way to go.
thanks for your warm words for Chiba - always appreciated and hope
you'll continue to work with Chiba.
Joern
thanks in advance,
Steven Marcus
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