EJB is a "pull" rather than a "push" metaphor.
You could have a daemon that polls your RDBMS to instantiate entity beans,
or some sort of trigger based event queue implementation.
-Chris.
> -----Original Message-----
> From: Fong Shing Lam [SMTP:[EMAIL PROTECTED]]
> Sent: Thursday, October 28, 1999 2:29 PM
> To: [EMAIL PROTECTED]
> Subject: Re: Q: Multiple EJB servers with one DB
>
> This is my question too. Say, if I have a news database that is updated by
> third party, and want to have a group of entity beans that serve news. In
> this entity bean class, I would intend to implement only the ejbLoad()
> method and some bussiness get methods for the session bean which will do
> whatever it needs with the returned news. For data integrity, I can only
> rely on a smart container which will get the table modify time frequent
> enough to invoke my ejbLoad(). This frequency is better configurable to
> suite my application need.
>
> Is this a feature for a general EJB server? or some other smart way to
> keep the memory in sycn with the underlying DB?
>
> Lam
>
> Javier Borrajo wrote:
>
>
>
> Assume there's one (huge) DB to which we want to provide
> access through EJB.Assume that there're multiple EJB servers that should
> provide access to this DB.Assume that a row in the DB is represented by an
> entity bean.Now, if an entity bean has been instantiated at BOTH servers,
> and then updated from one server, how is the second bean (at the 2nd
> server) updated? (This is even more problematic if caching is used)
>
> I understand second bean only needs to be updated when involved in
> next transaction,so there is no integrity problem but yes a performance
> problem. Data caching is only possible/recommended if the EJB server does
> not sharethe database with any other system, other EJB servers included,
> unless the vendorimplements multiple node data caching mechanisms. Regards
> Javier Borrajo www.tid.es <http://www.tid.es>
>
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