Re: PersistenceManager extends Serializable

[Craig L Russell]

Hi Geoff,






Craig

On Oct 18, 2006, at 5:01 PM, Geoff hendrey wrote:

I was thinking that there is no reason why the PM can't serialize to a stream an instance that it knows how to store in a database. It's easier, after all, than generating SQL for storage. So I'd mandate that the PM cannot throw not-serializable for persistent instances. Instances that implement Serializable get stored in the "normal" way. Instances that don't get stored in a PM- specific format in the stream. It's only instances that the user wants to store in the session directly that need to be Serializable (this because that is a container contract).

If the instances in cache are not serializable, then an exception gets thrown at runtime when the instance in cache tries to serialize. (of course a PM might be "super smart" and might know how to serialize a PersistanceCapable instanc. Heck, it already knows how to map a PC to a database).

:-)
-geoff

----- Original Message ----
From: Michael Bouschen <[EMAIL PROTECTED]>
To: jdo-dev@db.apache.org
Cc: JDO Expert Group <[EMAIL PROTECTED]>
Sent: Wednesday, October 18, 2006 2:43:43 PM
Subject: Re: PersistenceManager extends Serializable

Hi Craig,

I think this is a good idea, since it would allow storing a
PersistenceManager as a session attribute (for whatever purpose). The

PersistenceManager? What happens with cached persistent instances of a
non-serializable class?

Regards Michael

interesting question is whether any caches get serialized along with the

Javadogs,

For easier development of web applications, it would be nice if
PersistenceManager were Serializable. There is nothing stopping an
implementation from declaring that their implementation extends
Serializable, but the behavior is implementation-specific.

For the maintenance release, I'd like to see if we can agree on the
behavior of serializing a PersistenceManager if it does implement
Serializable.

Craig

Craig Russell

Architect, Sun Java Enterprise System http://java.sun.com/products/ jdo

408 276-5638 mailto:[EMAIL PROTECTED]

P.S. A good JDO? O, Gasp!

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

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