Hello Pieter, Tuesday, August 23, 2005, 9:51:12 AM, you wrote:
PVG> Hi Matthias, please be careful not to keep the semantics of your PVG> UML::foundation::core metapackage and Java metamodel at the same level PVG> of abstraction. A UML class shouldn't map directly on a Java class. PVG> I mean: you could give both the same semantics but I believe you would PVG> use MDA outside its original scope. Reengineering the EJB cartridge PVG> would be a good case study for model transformations since one can PVG> introduce several useful abstraction layers. I'm just mentioning this PVG> because most ATL examples involve mappings between languages at the PVG> same levels of abstraction... PVG> Best regards, PVG> Pieter. good point, I agree with you completely! I have already seen people write transformations too simple and straightforward. :-) No, we won't do transformations between identical abstraction layers. We will have several levels in between. For example, the Spring cartridge could have its own PSM metamodel. A UML <<Service>> could be translated into a Service instance in the Spring metamodel and then further be transformed into separate Class and Interface instances in the 3GL metamodel as well as into text format, i.e. an entry in applicationContext.xml. That way, we'll achieve more re-use and less code. There could also be all kinds of technical stuff in the Spring metamodel, e.g. support for transactions, security, etc. That will depend on requirements and feasability. I also intend to have higher level constructs in the 3GL metamodel, for example pre- and postconditions of methods. That way, concrete cartridges like Java and C# could map those conditions to additional methods in the generated code. Re-engineering the EJB cartridge would be an interesting project. However, EJB 2.x will soon go away and be replaced by EJB 3.0, so we should at least wait until we decide to invest further resources into it for AndroMDA 4.0. The possibilities are endless... Matthias --- Matthias Bohlen Internet: http://www.mbohlen.de/ [EMAIL PROTECTED] Post: Luise-Albertz-Str. 25 D-53340 Meckenheim Tel: 0170 / 772 8545 Fax: 02225 / 945189 ------------------------------------------------------- SF.Net email is Sponsored by the Better Software Conference & EXPO September 19-22, 2005 * San Francisco, CA * Development Lifecycle Practices Agile & Plan-Driven Development * Managing Projects & Teams * Testing & QA Security * Process Improvement & Measurement * http://www.sqe.com/bsce5sf
