Re: Type-safe Prevayler, using generics

How do you guys feel about Prevayler 3.0?

Is it time to start to think about?


Klaus.. maybe the bubble code could be a feature in 3.0.. what you think?


Felipe



2011/11/4 Karl Wettin <[email protected]>

> Next week I've got clock cycles over to refactor the Factory so that there
> is one per serialization strategy or so in order to avoid adding
> dependencies on things one might not be using. It'd be nice if we where
> merged with this fork  by then.
>
> So I just did a diff to see what's really been done. I'm 100% +1 for
> fetching from the fork and releasing as 2.6.
>
> I'm not sure, are you guys expecting /me/ to be committing this or what?
> Let me know and I'll take care of it ASAP.
>
>
>                        karl
>
> 29 okt 2011 kl. 02.04 skrev Klaus Wuestefeld:
>
> > +1
> >
> > On Fri, Oct 28, 2011 at 9:17 PM, Justin T. Sampson <[email protected]>
> wrote:
> >> Nice. :) I'd done this on a branch a while ago but I think I took it
> too far
> >> and it ended up getting really complicated. Trying again with the bare
> >> minimum generics in the high-level API is a good idea.
> >> By the way, generics do not eliminate any run-time casting, so there's
> no
> >> performance benefit. The compiler generates all the same casts that you
> >> would have written by hand without generics.
> >> On Fri, Oct 28, 2011 at 3:54 PM, Naveen Chawla <[email protected]>
> >> wrote:
> >>>
> >>> Small point, but by using generics, Prevayler has complete type-safety
> >>> minus casting. Took me longer than expected, but I've attempted this on
> >>> Prevayler source. I submitted a "fork" on the prevayler git -
> >>> https://github.com/Navigateur/prevayler - I'm not very good at git,
> but I
> >>> think that's how you want contributions submitted. Needs run time
> testing.
> >>> Demo and test code modified to match. Summary usage:
> >>>
> >>> instead of
> >>> Prevayler prevayler
> >>> use
> >>> Prevayler<MyTypeToPrevail> prevayler
> >>>
> >>> and instead of
> >>> PrevaylerFactory prevaylerFactory
> >>> use
> >>> PrevaylerFactory<MyTypeToPrevail> prevaylerFactory
> >>>
> >>> For your custom transactions/queries:
> >>> replace
> >>> implements Transaction{
> >>> with
> >>> implements Transaction<MyTypeToPrevail>{
> >>>
> >>> and
> >>> implements TransactionWithQuery{
> >>> with
> >>> implements TransactionWithQuery<MyTypeToPrevail, MyTypeToReturn>{
> >>> same for Query, SureTransactionWithQuery
> >>>
> >>> Then, you don't do any casting from Object to prevalent type, nor from
> >>> ".execute" to return type, as these arrive in native form.
> >>> ("MyTypeToPrevail" is compiler-checked as implementing Serializable in
> all
> >>> the above cases)
> >>>
> >>> i.e. instead of
> >>> (MyTypeToPrevail)prevalentSystem
> >>> you just use
> >>> prevalentSystem
> >>> and instead of
> >>> (MyTypeToReturn)prevayler.execute(...
> >>> you just use
> >>> prevayler.execute(...
> >>>
> >>> It might even run faster due to lack of run time casting on each
> >>> transaction/query, who knows (not me). Hopefully you can test, and as
> soon
> >>> as it works immediately release it as an update, or at least an
> immediate
> >>> parallel choice as I really want this version now but with your genuine
> >>> backing.
> >>>
> >>>
> >>>
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> >>
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> >>
> >
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