Re: Cayenne in j2ee - message beans

From: Gary Jarrel (garyjarre..mail.com)
Date: Mon Mar 17 2008 - 20:35:57 EDT

  • Next message: Andrus Adamchik: "Re: Cayenne in j2ee - message beans"

    Thank you for the quick reply.

    I know I should probably do some of my own profiling, but is the process of
    creating a new datacontext expensive computation wise?

    Thank you!

    Gary

    On Tue, Mar 18, 2008 at 4:55 AM, Andrus Adamchik <andru..bjectstyle.org>
    wrote:

    > The simplest thing to do is to limit the scope of the thread
    > DataContext to the 'onMessage' method. I.e. create a new context on
    > entry, bind it to the current thread, and unbind it in the "finally"
    > block... The performance impact is of course that you need to refetch
    > everything related to your processing on every call, which may or may
    > not be a problem.
    >
    > Andrus
    >
    >
    > On Mar 17, 2008, at 4:18 PM, Gary Jarrel wrote:
    >
    > > Hi All!
    > >
    > > One of the requirements of the current project I'm working on is to
    > > use a
    > > j2ee environment and message driven beans in an application server
    > > such as
    > > glassfish.
    > >
    > > There is also a requirement to use a custom DAO library which relies
    > > on a
    > > thread bound data context.
    > >
    > > Basically the message bean receives a text message via JMS an prior to
    > > processing it, it must be stored in the database, then, once
    > > processed the
    > > results are also stored in a database.
    > >
    > > I've always tried to avoid EJBs however, in this case, my question
    > > is: has
    > > anyone got any "best practice" advice on how a data context should be
    > > created and bound to the thread in a message bean environment.
    > >
    > > The message beans are quite simple, in that they only receive the
    > > messages,
    > > an then call upon spring POJOs to do the processing of the messages.
    > >
    > > Thank you in advance.
    > >
    > > garyj
    >
    >



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