Please find in line.
Regards,
Alok
> -----Original Message-----
> From: Pradeep Kumar [SMTP:pradeepk@(protected)]
> Sent: Friday, September 19, 2003 10:48 AM
> To: J2EEPATTERNS-INTEREST@(protected)
> Subject: Re: Large finders on entity beans refactored
>
> -----Original Message-----
> From: Alok_Band [mailto:Alok_Band@(protected)]
> Sent: Friday, September 19, 2003 10:43 AM
> To: J2EEPATTERNS-INTEREST@(protected)
> Subject: Re: Large finders on entity beans refactored
>
> Container has to construct remote objects for all returned rows so
> container
> has to get all the identies (i.e. Primary Keys). And it is linked with
> remote object by "EntityContext" which is sent to your Bean class when it
> is
> associated with any EJB Object.
>
> SO THIS DOES MEAN THAT ALL THE OBJECTS MUST BE IN READY STATE AND NOT IN
> POOLED STATE. RIGHT?
[Alok_Band] Entity Bean objects could be pooled. When they are
associated with any EJB object
then "EntityContext" would reflect the identity
of the EJB object using "entityContext.getPrimaryKey()"
Say ur finder method returned some 25
rows, container would return ArrayList of 25 Remote interfaces.
At this point no entity bean could be ready
state. When client invokes any business method on any remote
Entity Bean object will associated with EJB
object on the server and it will go in ready state.
Ofcourse algorithm when to associated entity
bean objects with EJB Object could vary fron vendor to vendor.
>
>
>
> On the statement,
> "It doesnt give identity till there is request by client. But there is
> cost
> of construction of Remote interfaces that it return to the client for
> multi
> object finders."
>
> From this I understand that Bean objects are not associated with remote
> unless there request by client. But remote object do have associated
> "Identity" i.e. EntityContext.
>
> Thanks,
> Alok
>
>
> > -----Original Message-----
> > From: Pradeep Kumar [SMTP:pradeepk@(protected)]
> > Sent: Friday, September 19, 2003 9:58 AM
> > To: J2EEPATTERNS-INTEREST@(protected)
> > Subject: Re: Large finders on entity beans refactored
> >
> > To me the specs statement contradicts the behavior of the finder
> methods.
> > The very purpose of finding is to first get all the identities (primary
> > keys), so now that you have the identities, how could the container not
> > keep them in the ready state and loose the object identities (pooled
> state
> > do not have any identities).
> >
> > I don't get it when you say that the identity is not given to the
> objects
> > until the client has requested. Where and how else the identities are
> > maintained by the container?
> >
> > -----Original Message-----
> > From: Kalra, Ashwani [mailto:ashwani.kalra@(protected)]
> > Sent: Friday, September 19, 2003 9:54 AM
> > To: J2EEPATTERNS-INTEREST@(protected)
> > Subject: Re: Large finders on entity beans refactored
> >
> > Here is what specs says
> > "After the ejbFind<METHOD>(...) method completes, the instance remains
> in
> > the pooled
> > state. The container may, but is not required to, immediately activate
> the
> > objects that were
> > located by the finder using the transition through the ejbActivate()
> > method. " Section 10.5.3 page no 177 of EJB 2.0
> >
> > It doesnt give identity till there is request by client. But there is
> cost
> > of construction of Remote interfaces that it return to the client for
> > multi object finders.
> > HTH
> > /Ashwani
> >
> >
> > -----Original Message-----
> > From: Pradeep Kumar [mailto:pradeepk@(protected)]
> > Sent: Friday, September 19, 2003 9:30 AM
> > To: J2EEPATTERNS-INTEREST@(protected)
> > Subject: Re: Large finders on entity beans refactored
> > While the container is executing the finder method, it must give
> > identities to each of the objects (primary keys). Hence, they must be
> > placed in the ready state, since objects do not have any identity in the
> > pooled state.
> >
> > Can someone please clarify the statement from the specs.
> >
> > -----Original Message-----
> > From: Kalra, Ashwani [mailto:ashwani.kalra@(protected)]
> > Sent: Thursday, September 18, 2003 7:28 PM
> > To: J2EEPATTERNS-INTEREST@(protected)
> > Subject: Re: Large finders on entity beans refactored
> >
> > Here what I read from specs 2.0
> >
> > "The instance does not move to the ready state during the execution of a
> > finder or a home
> > method."
> > -----Original Message-----
> > From: Pradeep Kumar [mailto:pradeepk@(protected)]
> > Sent: Monday, September 15, 2003 9:54 AM
> > To: J2EEPATTERNS-INTEREST@(protected)
> > Subject: Re: Large finders on entity beans refactored
> > I totally agree. We are told that if we read a large amt of data via
> > entity beans, there will be too many entity objects in ready state. One
> > can argue, that they will be the cached data for subsequent reads (lets'
> > say via find by primary key), however, to avoid dirty reads, the
> container
> > calls the EJB load method, which defeats the purpose of caching
> >
> > -----Original Message-----
> > From: Katz Guy [mailto:Guy_Katz@(protected)]
> > Sent: Sunday, September 14, 2003 12:12 PM
> > To: J2EEPATTERNS-INTEREST@(protected)
> > Subject: Large finders on entity beans refactored
> >
> > Hi;
> > Going through the core patterns book.
> > There is a bad practice dedicated to not using finder methods when large
> > result is expected but use a DAO instead.
> > My understanding is that the authors want to have a 'dual interface' for
> > access to the same data, Modeling the data itself as entity beans yet
> > using DAO for the search. Is this correct?
> > If so, wouldn't this be in contrast to resusability? Also, isnt this a
> > good place to put your money on vendor container optimiations?
> > _______________________
> > Guy Katz
> > Software Architect, CAP-IFS
> > Comverse
> > guy.katz@(protected)
> > +972 3 7663686
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