On 10 Apr 00, at 10:11, Louth, William (Exchange) wrote:
> Hi Dan,
>
> I think Web Logic is viewing the following statement
>
> <specification>
> 9.4.5 ejbStore
> When the container needs to synchronize the state of the entity object in
> the database with the state of
> the enterprise bean instance, the container first calls the ejbStore()
> method on the instance, and
> then it extracts the container-managed fields and writes them to the
> database.
> </specification>
>
> to mean that they do not have to call ejbStore since they do not have to
> synch the state.
I think you're probably correct about the reasoning. 9.1.5.2,
however, is clear:
"The container must invoke this method on the instance whenever
it becomes necessary for the instance to synchronize its state in
the database with the state of the instance�s fields. This
synchronization always happens at the end of a transaction."
9.1.7 verifies this:
"The container invokes the ejbStore method at the end of a
transaction, and may also invoke it at other times when the
instance is in the ready state."
-Dan
>
> Can somebody tell me has this feature ever got in the way of their ejb
> programming i.e. they needed this callback for some obscure reason not
> related directly to persistence.
>
> William Louth
>
> > -----Original Message-----
> > From: Dan OConnor [SMTP:[EMAIL PROTECTED]]
> > Sent: Monday, April 10, 2000 2:19 PM
> > To: [EMAIL PROTECTED]
> > Subject: Re: Unneeded calls to ejbStore
> >
> > I'm sorry, William. I just realized that in both examples you were
> > talking about not calling ejbStore. On first reading, I thought you
> > were referring to the ejbLoad behavior in the "read-only cache"
> > example. My bad!
> >
> > You are correct; this is a violation of the specification.
> >
> > -Dan
> >
> > >
> > >
> > > On 10 Apr 00, at 8:40, Louth, William (Exchange) wrote:
> > >
> > > >
> > > > read-only cache strategy
> > > >
> > > > The read-only cache strategy can be used for entity EJBs that are
> > never
> > > > modified by an EJB client, but may be updated periodically by an
> > external
> > > > source. For example, a read-only entity EJB may be used to represent a
> > stock
> > > > quote for a particular company, which is updated externally to the
> > WebLogic
> > > > Server system.
> > > >
> > > > WebLogic Server never calls ejbStore() for a read-only entity EJB.
> > ejbLoad()
> > > > is called initially when the EJB is created; afterwards, WebLogic
> > Server
> > > > calls ejbLoad() only at intervals defined by the read-timeout-seconds
> > > > deployment parameter.
> > > >
> > > The read-only cache strategy does not violate the specification.
> > > Section 9.1.1.0 specifically allows this behavior as commit option
> > > "A":
> > >
> > > "The Container caches a ready instance between transactions. The
> > > Container ensures that the instance has exclusive access to the
> > > state of the object in the persistent storage. Therefore, the
> > > Container does not have to synchronize the instance's state from
> > > the persistent storage at the beginning of the next transaction."
> > >
> > > The timeout-interval is clearly allowed because the server is
> > > allowed to call ejbLoad at any "arbitrary" time, according to the
> > > specification.
> > >
> > > -Dan
> > >
> > >
> >
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>
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