[JBoss-user] ejb design question

[Beau Cronin]

Hi all. I have design question which I'm sure someone on this list can answer without blinking, but which has been giving me fits:

Basically, I have an entity bean A whose name is derived from the names of its CMR entity beans B and C. I.e., the name is not stored in one of A's CMP fields but must be calculated from various CMP values in B and C. Furthermore, I want to access A's name from one of the fore-mentioned CMR entities B and C. Obviously, if I wait until the first access of A to generate the A's name (i.e., naively on demand), this results in reentrance:

(1) B calls A.getName()
(2) A.getName() calls B.getFoo()

So, what I would like to do is to guarantee that A's name is computed *before* B's thread of control calls A.getName(). What is the best way to do this? I've tried executing A.setName() in A's ejbLoad() method, but it appears that if A is loaded as a result of B's call in (1), then this still counts as occurring in the same thread of control, and therfore still counts as reentrance.

Oh guru, what am I missing?

Thanks,

Beau Cronin



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