Hi,
I'm not quite sure if this is the right forum for such a discussion. I've
been developing OLTP applications for years and worked with different
distributed object platforms. For some time now I use J2EE for practical
purposes and I think it's great but it lacks explicit support for a very
important pattern in addition to EntityBeans and SessionBeans. The pattern
goes like this:
* client calls a remote method
* The method starts a transaction
* The method instantiates some stateful business objects and manipulates
their state
* The method stores the business objects and drops them (so that they can
be garbage collected)
* The method commits the transaction and returns to the client.
That's what we call "get in, do your dirt and get out" in transaction
processing. Now of course J2EE supports that pattern to some degree with
stateless session beans. You can call a method on a stateless session bean,
do some work and commit (or the commit is done automatically). What I'm
missing is something like a RequestBean. A RequestBean would behave like an
EntityBean but would exist only during a single request (=transaction) and
be visible only for the code in this transaction. I don't know if I made
clear what I mean. I want container managed persistence for the objects I
manipulate inside the method of a stateless SessionBean. And those
RequestBeans needn't be remote objects, in fact they shouldn't be remote
objects because it doesn't make sense for a client to call them directly.
They should only be usable by other EJBs specifically by stateless
SessionBeans.
Of course nothing prevents anybody from creating such objects, using a
repository to instatiate them generically or generate them from an XML
description or something like that. In fact I've done that. But it'd be
nice if I could use the CMP features of an application server like jboss to
load and store them in a standardized way.
Regards,
Alexander Jerusalem
www.vknn.org
[EMAIL PROTECTED]
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