Re: Prevayler Facade

Interesting.

Void methods without the annotation can default to Transaction.
Methods with a return value and without an annotation can default to
TransactionWithQuery.

So I think you might only need the @Query annotation. It that right?

See you, Klaus.



On Wed, Jul 22, 2009 at 12:03 PM, Diego Miranda<[email protected]> wrote:
> Hi all!
>
> For a project i'm developing i wrote a simple proxy that implements the
> transactions using annotations.
> Rigth now, this proxy needs that you implement an interface with the
> annotations. But the idea is that you
> define your prevalent object (without any interface) with those annotations.
> These annotations are the prevayler
> transactions:
>
> @Query
> @Transaction
> @TransactionWithQuery
>
> An example, following the prevayler demo examples:
>
> public interface IBank implements Serializable {
>
>        @TransactionWithQuery public Account createAccount (String holder)
> throws Account.InvalidHolder;
>        @Transaction public void deleteAccount(long number) throws
> AccountNotFound;
>
> }
>
> The implementation of IBank:
>
> public class Bank implements IBank {
>
>     ...
>     public Account createAccount(String holder) throws Account.InvalidHolder
> {
>         Account account = new Account(nextAccountNumber, holder);
>         accountsByNumber.put(new Long(nextAccountNumber++), account);
>
>         if (bankListener != null) bankListener.accountCreated(account);
>         return account;
>     }
>
>     public void deleteAccount(long number) throws AccountNotFound {
>         Account account = findAccount(number);
>         accountsByNumber.remove(new Long(number));
>         if (bankListener != null) bankListener.accountDeleted(account);
>     }
> ...
>
> The code remains the same.
>
> Generating the proxy is straighforward:
>
> Bank bank = PrevaylerProxy.createInstance ( IBank.class, new Bank(), "Bank"
> );
>
> If you found this is useful (and if possible, of course) i would be glad to
> contrib with the code. :)
>
> Regards
>
> Diego
>
>
>
>
> --
> Ley de Hofstadter: Siempre toma más tiempo del que se preveía, aun cuando se
> tenga en cuenta la Ley de Hofstadter.
>
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>

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