I third not going down the annotation route. Frankly, I don’t find the relationship annotations intuitive/easy-to-read at all. :) There are significant differences in the “default” cayenne behavior and default JPA behavior (one simple example: Cayenne assumes you want reverse relationships mapped. Reverse relationships in JPA/Hibernate are, IMO , a PITA. At least they were the last time I used them). Having used both Hibernate and Cayenne significantly, each has their merits… but it’s nice to have a different philosophy in the ORM space. It helps spur innovation and avoid “group think” about the “best” way to do ORM. Also, annotation-driven “POJOs” are a major pain to debug because they completely invert the object inheritance, and it’s really messed up. :)
Robert On Mar 14, 2014, at 3/142:22 AM , Andrus Adamchik <and...@objectstyle.org> wrote: > Hi Eshan, > > Good to see you back :) > > I second Ari about annotations. I can think of a few ways to simplify Cayenne > mapping, but annotations is not one of them. We are actually using > annotations, just not for ORM. Not basing our product on annotations gives us: > > * Generic persistent object. > * No fake POJO - Cayenne objects are “real”. > * Great startup performance. > > Re: JPA. We made an effort to implement a Cayenne-based JPA provider in the > past [1], and actually got pretty far with it. Looking back though, it was a > waste of time and clearly showed that if we want to preserve our philosophy > (mainly ObjectContext approach), we should keep going our own way, and don’t > try to fit a square peg in a round hole. Actually once we abandoned the JPA > work, lots of innovations have blossomed in Cayenne land (DI, property > expressions to name a few). > > So I personally have no interest in either of these ideas. But of course we > have many more other projects :) > > > Now a practical question - anyone in the community is ready to mentor a GSOC > project? Unfortunately I am out - just don’t have bandwidth. I am not even > sure if we’ve already missed the boat with our application this year? Any > takers? > > Cheers, > Andrus > > > > [1] https://cwiki.apache.org/confluence/display/CAYJPA/Index > > > On Mar 14, 2014, at 10:07 AM, Eshan Sudharaka <esudhar...@gmail.com> wrote: >> Hi Aristedes , >> >> Actually what I though is if we can support JPA standards (purely) like >> hibernate it is very easier to switch from >> ORM to other. In addition we can have cayenne specific entity relates >> functions(Vendor specific) . I am not sure how far this >> idea is practical for end users. >> Thanks >> >> >> On Fri, Mar 14, 2014 at 10:42 AM, Aristedes Maniatis >> <a...@maniatis.org>wrote: >> >>> Cayenne's concept of a data model is pretty much at the core of the whole >>> library. To replace that, and the fact that entities are all subclasses of >>> Cayenne entity classes, doesn't seem to be particularly helpful. >>> >>> It is fairly trivial to change the velocity templates to add some >>> annotations to the generated classes, if that helps with your readability. >>> >>> Having said that, we are always open to ideas and contributions. But I >>> think your proposal for this idea needs to be more defined and narrow in >>> scope. Perhaps a conversion between JPA annotations and cayenne modeler XML? >>> >>> >>> Ari >>> >>> >>> >>> On 14/03/2014 3:32pm, Eshan Sudharaka wrote: >>>> Hi Aristedes , >>>> >>>> I have used cayenne for object relational mapping for some projects. And >>> I rather prefer to have annotation >>>> support like we have in Hibernate and its really readable when we have >>> annotations for object relationships. >>>> >>>> Could you please share your thoughts on this. Like how feasible this is >>> and the scope is with in or beyond the gsoc >>>> time line. >>>> >>>> Thanks >>>> >>>> >>>> >>>> >>>> On Fri, Mar 14, 2014 at 8:52 AM, Aristedes Maniatis >>>> <a...@maniatis.org<mailto: >>> a...@maniatis.org>> wrote: >>>> >>>> Hi Eshan, >>>> >>>> Thanks for your interest in the Apache Cayenne project. While we >>> have no formal GSOC 2014 projects planned, perhaps you'd like to propose >>> the areas in which you are interested in Cayenne. What is your experience >>> with Cayenne and what areas would you like to work on? >>>> >>>> Ari Maniatis >>>> >>>> >>>> On 14/03/2014 11:30am, Eshan Sudharaka wrote: >>>>> Dear Andrus,Ksenia and the members >>>>> >>>>> Thia is regarding for getting some information regarding GSOC 2014 >>> program. >>>>> Since I am following masters I am eligible for working on a sumer >>> of code >>>>> project. So I am planing to use my summer time for a GSOC project. >>>>> >>>>> It would be really helpful for me to get some details for the GSOC >>> plans in >>>>> this year. (Probably a product development or a feature) >>>>> >>>>> Looking forward work with Cayenne team in this sumer. >>>>> >>>>> Thanks >>>>> >>>> >>>> -- >>>> --------------------------> >>>> Aristedes Maniatis >>>> GPG fingerprint CBFB 84B4 738D 4E87 5E5C 5EFA EF6A 7D2E 3E49 102A >>>> >>>> >>>> >>>> >>>> -- >>>> /*~Thanks & Regards~*/ >>>> /**/*/ >>>> /* >>>> Eshan Sudharaka >>>> http://esudharaka.blogspot.com/ >>> >>> -- >>> --------------------------> >>> Aristedes Maniatis >>> GPG fingerprint CBFB 84B4 738D 4E87 5E5C 5EFA EF6A 7D2E 3E49 102A >>> >> >> >> >> -- >> *~Thanks & Regards~* >> >> Eshan Sudharaka >> http://esudharaka.blogspot.com/ >
