Very good question; I'd like to know the answer to that as well.
I'm using Spring's @transaction stuff. I tweaked it slightly to make read-only
and read/write annotations;
@Target({ElementType.METHOD, ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
@Transactional(
readOnly = true,
rollbackFor = Throwable.class,
propagation = Propagation.NOT_SUPPORTED,
isolation = Isolation.DEFAULT
)
public @interface TransactionalReadOnly {
// empty
}
and
@Target({ElementType.METHOD, ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
@Transactional(
readOnly = false,
rollbackFor = Throwable.class,
propagation = Propagation.REQUIRED,
isolation = Isolation.DEFAULT
)
public @interface TransactionalReadWrite {
// empty
}
But I'm using only the TransactionalReadWrite in my service layer at the
moment. For testing my dao layer I'm using a a spring xml config file with the
tx: and aop: tags to make my daos use transactions. I can email that if you'd
like.
asianCoolz wrote:
> 1.normally on spring, we will use @transactional at service layer for
> concurency control, if we use google guice, is there similar
> annotation and does it suported in GAE?
> 2. is google guice all classes supported in GAE? i about to start look
> at google guice, as i find some of the classes in spring are not
> supported in GAE. any advise?
> 3. is @transactional is required for bigtable? arent bigtable is not
> transactional?
>
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