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Struts & Hibernate
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| | | Large finders on entity beans refactored | Large finders on entity beans refactored 2003-09-19 - By Alok_Band
Back
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.
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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