Hi, and apologies to everyone if this question has been asked before
(I have searched and searched and cannot find a definite answer for my
problem).
I would like to know if there is a way of taking a CayenneDataObject
and transforming it into a "Value Object". Let me explain why:
I am trying to use cayenne on the server side of an application.
Communication with the server is primarily through a Bus (SonicMQ)
using JMS ObjectMessages. The clients of the bus are going to be a mix
of Java and .Net (using SOAP probably). What I would like though is
for the clients to receive an object representing the data they
required, but not giving them access to the DataContext - forcing them
to send a message back through the bus which would transform the value
object back to a DataObject and save it as appropriate - thereby
controlling the validation and whatever else of the data.
What I have got so far is returning the CayenneDataObject to the
client, but when I do a .toString() on it (client side), it gives me
the primary key, and tells me "state: hollow". Ok, fair enough, at
least it has serialized the primary key so I am confident I am getting
something back. I have seen a few posts about serializing the
DataContext and by using that dataxcontext I can the refresh my object
- but I don't think that is what I want to do as I want to be quite
restrictive of what the clients can do - prefering them not to care
about what is running on the server side.
Has anyone else solved a problem similar to this who would mind
sharing with me what they have done? Is this something Cayenne
supports already but I just haven't looked in the right place?
Thanks for any help
Andrew Reed
Auckland University of Technology
Auckland
New Zealand
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