Re: Type-safe Prevayler, using generics

+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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>

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Get your Android app more play: Bring it to the BlackBerry PlayBook 
in minutes. BlackBerry App World&#153; now supports Android&#153; Apps 
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it is! http://p.sf.net/sfu/android-dev2dev
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_______________________________________________
"Databases in Memoriam" -- http://www.prevayler.org