I made a mod to the ejb:transaction tag that I thought others
might be interested in, so I'm describing it here for discussion.
I've always been really bothered by the EJB terminology for
transaction types. Quick, what's the difference between
"Required" and "Mandatory"? "NotSupported" and "Never"? OK, I
know the answers, and so do you, probably -- but being used to
it doesn't make the terminology any less horrid. And bad
terminology can really thwart the high-level discussion and
analysis the EJBs are supposed to make easier.
So, I added support for a clearer alternative. With the patch,
instead of this:
@ejb:transaction
������type="Supports"
...you can specify the rules in a much more comprehensible way,
specifying the action to take depending on whether a transaction
is present or absent in the current context:
��@ejb:transaction
������present="use"
������absent="ignore"
It's backward-compatible -- either way works -- you can specify
either "type" or the "present" / "absent" pair (but not both) in
your ejb:transaction tag. The allowable values for the "present"
attribute are: ignore, use, create, and error; "absent" is the
same, except it doesn't allow "use" because it wouldn't have any
meaning.
The modified tag handler will translate the present/absent pair
into the appropriate EJB transaction type, or give an error if
you choose a combination not allowed by the spec. The full
translation table is as follows:
absent / present => type
----------------------------------
ignore / ignore => NotSupported
ignore / use => Supports
create / use => Required
create / create => RequiresNew
error / use => Mandatory
ignore / error => Never
Now I think this is cool, and am pleased with its effect on my
code's readability. Questions: Is this a patch others would
like? Do people have suggestions for improvement? Might we
consider adding this as a standard feature of ejbdoclet?
If there is interest on this list, I'll send my code out.
Cheers,
Paul
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