On Wed, May 19, 1999 at 09:42:08AM +0200, Rickard �berg wrote:
> "Masters.Robert" wrote:
> > Couldn't application wide resources (perhaps including "environment
> > variables" be represented as objects stored in the JNDI namespace? that way
> > both EJB and client objects could retrieve them? JNDI seems to be a nice
> > solution for storing/searching etc for global objects?
>
> Asbolutely. But there is no way to do "application wide" settings with
> the current EJB1.1 spec. This might change though(Vlada?).
>
I can't see how application-wide settings could be possible. Let me first reiterate
what environment entries do:
Each EJB queries environment entries that it understands. The Bean
Provider wants an environment entry for "defaultCurrency" or
"maxTotalOrder", rather than hard-coding these or putting in his own
configuration scheme.
By choosing to use environment entries, the Bean Provider is giving
the Application Assembler (and potentially the Container vendor also)
the chance to modify the values of these environment entries.
Now, an application unit potentially consists of components from
multiple providers. An environment entry used by Bean A will not make
any sense to Bean B.
Putting environment entries at the application scope is only useful in
the special case where many of the Beans in the application unit
arrive from the same Provider. To cater for this "special case"
endangers the simplicity of the model.
If a vendor believes it's market would enjoy such a feature, then it
is free to implement this feature in any way it likes, without
affecting the underlying deployment descriptor. For example, the
Application Assembler's GUI tool could allow the user to click on
multiple Beans and change values of common environment entry names.
Malcolm
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