----- Original Message -----
Sent: Thursday, August 07, 2003 6:08
AM
Subject: Re: Performance for
Finders
Please ignore the earlier mails from me on this subject.
This
requirement does not apply to the ejbFindByPrimaryKey method..... "
This raises
further curiousity!! Why ?
/Ashwani
Hello ,
Johan is right by saying
"Custom finders will always require a database
roundtrip (most app servers) even if the resulting row already has a
representation in the cache".
As said in the specs for EJB 2.1
under section "10.5.3 Container's View"
"public
<primary key type or
collection> ejbFind<METHOD>(...);
.... The container
invokes the ejbFind<METHOD> method on an instance when a client
invokes a matching find<METHOD> method on the
entity bean's home interface.
The container must
pick an instance that is in he pooled state (i.e., the
instance is not associated with any entity object
identity) for the execution of the ejbFind<METHOD>
method.
If there is no
instance in the pooled state, the container creates one
and calls he setEntityContext method on the instance
before dispatching the finder method. ......
Before
invoking the ejbFind<METHOD> method, the container must first synchronize the state of those entity bean instances by
invoking the ejbStore method on
them.
This
requirement does not apply to the ejbFindByPrimaryKey method..... "
This means there can be
difference in performance between the customFinders and
findByPrimaryKey methods
As that the container has to/needs to
sync the states of all the beans by invoking ejbStore method, which
amounts to database roundtrip
thanks & regards,
Vikram Naik
----- Original Message -----
Sent: Wednesday, August 06, 2003 3:28
PM
Subject: Re: Performance for
Finders
findByPrimayKey allows the app server to pick the object
from an entity cache without a roundtrip to the database. Custom finders
will always require a database roundtrip (most app servers) even if the
resulting row already has a representation in the cache.
/Johan
Den 03-08-06 10.05,
skrev "Vikram Naik" <[EMAIL PROTECTED]>:
Hello
All,
Is there a performance difference between
the findByPrimayKey and customFinders ?
Ofcourse the
performance of the custom finders will depend on the query, but fot this
case we can consider the query of the custom finders will be as simple
as that of the findByPrimaryKey!!
Please
comment.
TIA,
Vikram Naik
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