Again it comes down to how you choose to implement your system: for something like that, it could also be calculated at another level and placed on a value object if access to that calculated attribute was needed outside of the business tier. I personally choose NOT to perform any extra logic my entity layer.
-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED] Sent: Monday, December 06, 2004 7:46 AM To: [EMAIL PROTECTED] Subject: RE: [Andromda-user] Adding business methods to Spring Entities Hi Chad, just imagine a simple class that has several attributes that can be set and some other attributes that can be calculated from the other attributes. The java.util.Date class is a well-known sample for this typ of classes. You might argue that this is not very "business method"-like, but it is needed nevertheless. - Peter >-----Original Message----- >From: Chad Brandon [mailto:[EMAIL PROTECTED] >Sent: Monday, December 06, 2004 3:37 PM >To: FRIESE, PETER; [EMAIL PROTECTED] >Subject: RE: [Andromda-user] Adding business methods to Spring Entities > > >However what advantages does it provide? It may correspond to >the "Hibernate >philosophy" however I've always preferred to make my entities >be data access >only and the services provide the business methods, sometimes >it make sense >to add a method to the DAO if it may be called from multiple >places from the >service (so I added that option) but I still wouldn't consider >it a business >operation since clients should only be calling the service >layer anyway. > >Peter, you say placing operations on DAOs mixes concerns, >however I'd say >placing "business" operations on hibernate entities correspond >just as much >or more mixing of concerns (since they provide the actual >mapping to the >underlying database). I guess what it really comes down to is >how to, is >how you prefer to design your system. > >Chad > >-----Original Message----- >From: [EMAIL PROTECTED] >[mailto:[EMAIL PROTECTED] On Behalf Of >[EMAIL PROTECTED] >Sent: Monday, December 06, 2004 2:01 AM >To: [EMAIL PROTECTED] >Subject: RE: [Andromda-user] Adding business methods to Spring Entities > >Hi Chad, hi Roy, > >>> Chad Brandon wrote: >>> Business methods are currently created on the DAOs if you model >operations >>> on the entities, does that not work for you? >> >> Roy wrote: >>The short answer is no. I don't think an object that wants to call an >>entity's business method should depend on its corresponding DAO. > >I second that. According to the Hibernate philosophy, the >business objects >should contain the business methods, thus producing a rich >domain model. > >Adding business models to DAOs results in a mix up of two >concerns (data >access on one hand, business logic on the other hand). > >- Peter > > >------------------------------------------------------- >SF email is sponsored by - The IT Product Guide >Read honest & candid reviews on hundreds of IT Products from >real users. >Discover which products truly live up to the hype. Start reading now. >http://productguide.itmanagersjournal.com/ >_______________________________________________ >Andromda-user mailing list >[EMAIL PROTECTED] >https://lists.sourceforge.net/lists/listinfo/andromda-user > > ------------------------------------------------------- SF email is sponsored by - The IT Product Guide Read honest & candid reviews on hundreds of IT Products from real users. Discover which products truly live up to the hype. Start reading now. http://productguide.itmanagersjournal.com/ _______________________________________________ Andromda-user mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/andromda-user ------------------------------------------------------- SF email is sponsored by - The IT Product Guide Read honest & candid reviews on hundreds of IT Products from real users. Discover which products truly live up to the hype. Start reading now. http://productguide.itmanagersjournal.com/ _______________________________________________ Andromda-user mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/andromda-user
