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To: EJB-INTEREST@JAVA.SUN.COM Subject: EJBs and Aspect-oriented programming From: Carl Jones
Reply-To: A mailing list for Enterprise JavaBeans development I have just come across the subject of aspect-oriented programming (see http://www.parc.xerox.com/spl/projects/aop/) and can see a number of parallels between it and EJB development. Aspect-oriented programming (AOP) allows the modelling of behaviour that "cross-cuts" a number of objects. To me, it would seem that EJBs currently support at least four such aspects; persistence, transactions, security and concurrency. The idea with AOP is that an aspect is defined along with a "weaver" that weaves the aspect's code into the selected class. If these parallels are correct, it seems to me that we have a modeling concept that should be used in the EJB specification and which would allow for the addition of new aspects to the EJB model over time, say replication.
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