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Date: Mon, 07 May 2007 15:48:40 -0700
From: Craig L Russell <Craig.Russell@Sun.COM>
Subject: Re: detachable vs non detachable classes serialization compatible
In-reply-to: <1178455160.463dcc7805f46@webmail.jpox.org>
Sender: Craig.Russell@Sun.COM
Cc: Apache JDO project <jdo-dev@db.apache.org>,
        JDO Expert Group <jdo-experts-ext@Sun.COM>
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Hi Erik,

It would help if you could explain what you have in mind with this =20
change. The decision to make the detachable serialization contract =20
incompatible was deliberate, and the objective is to guarantee that =20
attaching a detached instance behaves correctly.

If you want a detached instance simply to send it away and never =20
expect to see it again, your proposal might be of interest. Is that =20
what you had in mind?

Do you have some ideas on how to implement this feature? Seems that =20
if the unenhanced class is given an input stream with the detached =20
info in the serialized form of the instance, it's going to run into =20
an exception (unless you modify the unenhanced class, perhaps with a =20
byte-code enhancer).

Thanks,

Craig

On May 6, 2007, at 5:39 AM, Erik Bengtson wrote:

> Hi,
>
> The spec says classes that detachable and non detachable classes =20
> are not
> compatible intentionally. I would like to propose a change to this =20
> behavior and
> let the =93jdoDetachedState=94 lose on unmarshalling.
>
> From:
> "Classes marked as Detachable are not serialization-compatible with =20=

> un-enhanced
> classes. This is intentional, and requires that the enhanced =20
> version of the
> class be used wherever the instance might be instantiated."
>
> To:
> "Classes marked as Detachable are not serialization-compatible with =20=

> un-enhanced
> classes. When unmarshalling a detached object with an un-enhanced =20
> version of
> the class, the detached state is dropped and no further read or =20
> change tracking
> will occur on the unmarshalled instance."
>
> Regards,
>
> Erik Bengtson

Craig Russell
Architect, Sun Java Enterprise System http://java.sun.com/products/jdo
408 276-5638 mailto:Craig.Russell@sun.com
P.S. A good JDO? O, Gasp!


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