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Re: [eclipselink-dev] 2.1 Design doc for JMS-MDB cache coordination

Hello Samba,

Thank you for your feedback.  Some comments are inline:

Samba wrote:
Hi Chris,
I suppose eclipselink creates a session for the Persistence-Unit-Name that is mentioned in the persistence.xml(if not, then I would suggest that it should); hence it should be sufficient to mention the persistence-unit-name in the MDB to get the instance of RemoteCommandManager.
Hence, the following actions may not be required:
Example MDB’s getSession requires the session name be defined in the ejb-jar.xml under a “tl_session_name_for_mdb” property.

    * JPA users will need to either
          o define a unique session name in persistence.xml using
            <property name="eclipselink.session-name" value="MySession"/>
          o deploy their own MDB and use EM injection or
            Persistence.getEntityManagerFactory and the JPAHelper to
            get the session

> Yes, I guess the second point wasn't clear. The example MDB used a session name, which would be used for people using sessions.xml and users specifying the session name using the eclipselink.session-name in persistence.xml. The alternative is to get the EntityManager from the container or using SE mode, and then use the JPAHelper to get the session from it.

How about facilitating the cache co-ordination configuration through persistence.xml, perhaps via extended properties, for JPA users? I could not find that info in the document listed in the mail thread

> that would be a great feature. Unfortunately, the only way to configure cache coordination in JPA is through code configuration in a customizer.
I would recommend keeping the reference implementation of MDB as a seperate download so as to avoid the dependency on EJB MDB classes. Please remember that Eclipselink is also used in Java SE environments where EJB is not an available option.
> agreed. The method of getting the MDB out there still needs to be worked out.
I hope my concerns will be understood and a more JPA friendly solution will be evolved, Thanks and Regards,
Samba

On Fri, Jan 29, 2010 at 1:48 PM, christopher delahunt <christopher.delahunt@xxxxxxxxxx <mailto:christopher.delahunt@xxxxxxxxxx>> wrote:

    https://bugs.eclipse.org/bugs/show_bug.cgi?id=214534
    Patch uploaded for review and feedback


    Best Regards,
    Chris


    christopher delahunt wrote:

        Design documentation can be found here:

        http://wiki.eclipse.org/EclipseLink/Development/2.1/JMSCacheCoordinationUsingMDB
        <http://wiki.eclipse.org/EclipseLink/Development/JPA_2.0/undelimited_identifiers>


        Please provide feedback either by replying to this email or
        using the Wiki discussion page.

        Thanks,
        Chris
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