+1 good carma if you share points 2 and 3. ;-) Cheers, bob
2008/3/5, David Marko <[EMAIL PROTECTED]>: > > > Can you share some code example of the integration? > > Thanks, > David > > > > > Robert Zeigler wrote: > > > > Hi Andreas, > > > > I'm using T5 + cayenne (2.x) right now. > > > > 1: > > There are a variety of ways you could go about obtaining a data > > context in your services. > > 1) You could use the Cayenne-supplied servlet filter and obtain the > > thread-local copy of the context > > 2) You could use a RequestFilter to duplicate the functionality of the > > Cayenne's servlet filter > > 3) You could write a ContextProvider service, which provides the > > context. > > > > In my case, I did a combination of 2 & 3. I use a request filter to > > check associate a data context with a request + current thread, > > (either on a session-by-session basis or on a request-by-request > > basis). I also have a ContextProvider service which I inject into > > other services (by specifying it as a parameter in the service's > > constructor). Ultimately, my context provider grabs the (thread > > local) context set by the request filter. > > > > 2: > > I would advocate having a method like: getReadonlyContext() in your > > context provider service, which would contain your single, app-wide > > context. Then in your pages and components, you can @Inject your > > ContextProvider and grab the context. > > > > 3: You can contribute ValueEncoders, PrimaryKeyEncoders, etc. into > > tapestry to handle your data objects. > > > > 4: Cayenne handles transactions for you transparently, unless you > > explicitly handle them yourself. > > So, in general, you have your form; your form submits; you perform > > your object manipulations, and then you dataContext.commitChanges(); > > and all of those object manipulations will be wrapped in a db > > transaction. > > > > Robert > > > > On Mar 5, 2008, at 3/56:05 AM , Andreas Pardeike wrote: > > > >> Hi, > >> > >> I have several T4 projects that use Cayenne successfully but now I > >> would > >> like to start a new project in T5. Though I think I got my head > >> wrapped > >> around the new IoC concept in T5, I still don't see the big picture. > >> > >> Maybe someone can provide me with pointers to examples or simply > >> explain > >> how I would set up the following: > >> > >> - My application *mostly* does data mining, that is, read-only > >> access to > >> a couple of databases > >> > >> - At a few places, I would need to have write access but it's simple > >> and > >> probably does not need transaction management (i.e. allow customers > >> to > >> update their email address) > >> > >> - In my old projects, I have a shopping basket that builds temporary > >> dao > >> objects until the user logs in. At that time, I merge those with the > >> actual dao's from the database > >> > >> - At a single point in the app (submitting the order), I actually need > >> transaction management > >> > >> - I would also love to go with Cayenne 3 and pojo dao's. > >> > >> My questions: > >> > >> 1) How do I provide an DataContext/ObjectContext to my services? Is it > >> as simple as injecting a ContextProvider into the service > >> constructors? > >> > >> 2) Since I don't need transaction management most of the time, can I > >> simply > >> use a global ASO that has a DataContext/ObjectContext which I then > >> use > >> in my page classes if necessary? > >> > >> 3) How do I solve the serialization problem that arises when I > >> submit forms > >> that contain dao's? > >> > >> 4) How do I handle my submit order where I *do* need transaction > >> management? > >> > >> Any help appreciated, > >> Andreas Pardeike > >> > >> --------------------------------------------------------------------- > >> To unsubscribe, e-mail: [EMAIL PROTECTED] > >> For additional commands, e-mail: [EMAIL PROTECTED] > > > > > > --------------------------------------------------------------------- > > To unsubscribe, e-mail: [EMAIL PROTECTED] > > For additional commands, e-mail: [EMAIL PROTECTED] > > > > > > > > > -- > View this message in context: > http://www.nabble.com/T5%3A-Examples-for-Cayenne-integration--tp15848762p15860055.html > Sent from the Tapestry - User mailing list archive at Nabble.com. > > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > >
