Thanks all for your input. Learnt something and will pick it from here. I just thought maybe there could have been something similar to hibernate4gwt in the hibernate land. Maybe I could work on something.
Good day Chanda On Wed, Sep 17, 2008 at 8:04 PM, Scott Anderson <[EMAIL PROTECTED]>wrote: > This topic has been discussed in this group before, but I'll reiterate > the general concepts. You can't serialize persistent objects, period. > There are many reasons why, but I don't have time to list them all, so > here are the three that are most important in my mind. > > Reason #1: > In order for the GWT compiler to transform your CayenneDataObjects in to > JavaScript, it would have to resolve a graph that would encapsulate the > entire Cayenne library. I could list the reasons why you can't do that, > but I don't have time to write an essay right now, so save yourself the > headache by taking me at my word when I say it won't work. > > Reason #2: > The purpose of the server-side code is to enable validation and > authentication. You can expose un-verified, un-authenticated database > access to the client-side code without RPC. If you're not going to > validate or authenticate, don't bother introducing the proxy. Cayenne > will work just as well in a stand-alone application -- the Modeler is a > good example of that. > > Reason #3: > By writing the code to copy information out of beans and in to the > CayenneDataObjects, you will be forcing yourself to plug any validation > holes you would otherwise surely forget. Additionally, by using beans > targeted to the needs of your operations, the amount of data that is > required to go back and forth through the RPC tunnel will be > substantially lower. > > If you were to serialize the CayenneDataObjects, which is impossible, > then for *every* operation you'd have to send the entire graph of the > object in question -- which is probably the entire database if you > reverse-map your relationships. > > > Hope this helps, > Scott > > -----Original Message----- > From: Chanda Fake [mailto:[EMAIL PROTECTED] > Sent: Wednesday, September 17, 2008 1:07 AM > To: [email protected] > Subject: Using Cayenne in GWT wthout DTOs > > Hi > > I have seen from the mailing list that some people have used Cayenne > with > GWT successfully.What is the best way to expose Cayenne model to GWT > without > using DTOs which I consider as duplication of work. Am trying to use my > Cayenne domain objects in GWT and running into some usual issues GWT. > Am > thinking if there is a way to create a module with the offending class > "CayenneDataObject" and then including it using <inherits ..>. What have > others done. > > Thanks in advance >
