should AC be transactionable? and other AC questions

Michael Ralston wrote:
> Should the Item and Policy interfaces extend
Transactionable?
> 
> I have problems with some usecase I have created, which
involve manipulating
> Users and Policies, if the usecase fails the repository
nodes are not
> committed but the AC changes happen instantly.
> 
> I've done some playing around with this idea before but
reversed my changes
> as it became a huge change to AccreditableManager,
ItemManager and
> PolicyManager.
> 
> Basically I had to make sure the RepositorySession was
always passed all the
> way down to PolicyManager.savePolicy (I know these
don't exist in the
> interface, I'm implying FilePolicyManager or whatever
other implementation
> it might be).
> 
> With the repository session present in
PolicyManager.savePolicy, the object
> is not written but is marked to be written later when
the transaction is
> committed, as with other repository objects. The
> Transactionable.saveTransactionable implemented on the
Policy/Item will then
> actually do the writing.
> 
> I also don't think that ac Items should be responsible
for creating and
> saving themselves. Shouldn't their respective managers
do this for them? 
> 
> Eg... UserManager should have a createUser method, this
makes it easier to
> develop for different AC implementations as the
Usecases no longer need to
> know which class to instantiate to create a user.
> 
> Likewise, the User object shouldn't save itself, the
UserManager should add
> the Transactionable user object to the repository
session so it gets saved
> when the transaction is committed.
> 
> Like to hear your thoughts...

i'm not very familiar with lenya's ac code, but i like the
idea that ac 
should behave in the same way as the respository
(transaction-based).
as to moving functionality from ac items to managers: sounds
good as 
well. however, i don't understand the issues well enough to
judge the 
intrusiveness or any unwanted side-effects of such changes.





-- 
"It's sad to behold how lately the wonderful English
language has,
in the hands of corporate executives and marketing experts,
re-
adjusted its prospective itinerary towards mythical
subterranean
realms of discomfort, leveraging traditional woven
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--
Jörn Nettingsmeier, EDV-Administrator
Institut für Politikwissenschaft
Universität Duisburg-Essen, Standort Duisburg
Mail: pol-adminuni-due.de, Telefon: 0203/379-2736

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