This is an option that vendors are allowed to implement according to the spec.
When doing so, an EJBObject instance may have multiple EJB instances, one per
thread. This implementation assumes that the underlying database will enforce
single threaded access to a row. So the serialised access happens at the db end
provided the db supports it, or else hell breaks out.
Han-Dat
Floyd Marinescu wrote:
> Hi everyone,
>
> I was stumped by the following post on TheServerSide:
> http://www.theserverside.com:8080/patterns/thread.jsp?thread_id=220#2665
>
> Gal suggests that most ejbServers will load multiple instances of an
> entity bean with the same primary key inorder to service multiple clients.
>
> Is this true? Which app. servers do this?
>
> He also suggests that serializeable transactions on these beans won't
> really be serializeable, how is that possible? What does it matter what
> concurrency algorith is used, the spec says serializeable transactions must
> occur in a serial fashion, so thats all a developer should be concerned with
> right?
>
> dazed and confused,
>
> Floyd Marinescu
>
> ---------------------------------
> Senior Architect / Director of Marketing
> The Middleware Company
> http://www.middleware-company.com
> http://www.TheServerSide.com
> [EMAIL PROTECTED]
> 416-889-6115
>
> Check out TheServerSide.com, the internets first J2EE community!!!
>
> ===========================================================================
> To unsubscribe, send email to [EMAIL PROTECTED] and include in the body
> of the message "signoff EJB-INTEREST". For general help, send email to
> [EMAIL PROTECTED] and include in the body of the message "help".
--
Technical AppServer Consultant - ProServ
___________________________________
iPlanet e-commerce Solutions
- A Sun|Netscape Alliance
Sun Microsystems Australia Pty Ltd
===========================================================================
To unsubscribe, send email to [EMAIL PROTECTED] and include in the body
of the message "signoff EJB-INTEREST". For general help, send email to
[EMAIL PROTECTED] and include in the body of the message "help".
