Re: Type-safe Prevayler, using generics

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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