[Springframework-developer] AOP and declarative transaction changes

[Rod J. <rod...@in...>]

All,

I've been doing a lot of performance work lately, and I'm sure you'll be
happy with the results.

I've made two significant changes:

- AopProxy now optimizes out empty advice chains, invoking the target
directly if there's a local target invoked by reflection. This optimization
doesn't apply if AdvisedSupport is configured to expose proxy or invocation,
which supposedly advised code may depend on. Performance benefit for
invoking non-advised methods on an advised object is about 30%. (Assuming
the method does not work itself, of course.)

- TransactionProxyFactoryBean now creates an InterceptionAroundAdvisor with
a pointcut that includes only transaction methods, rather than always adding
TransactionInterceptor. So TransactionInterceptor only runs if there _is_ a
transaction. Thus advice chain caching in the AOP framework can do its work.
Performance improvement around 50% in invoking non-advised methods on a
transaction proxy (no change in transactional methods, obviously.) I've
changed the TransactionAttributeSource to take Method and Class not
MethodInvocation, to make this work. It's an improvement anyway.

Also:

- Various logging guards which produce a slight boost in performance of
Spring transaction management.

Note that I've refactored MethodInvocationFactory into two:
MethodInvocationFactory and AdviceChainFactory. This was necessary to allow
the AOP optimization, but is an improvement I was planning anyway. This
would make something like a Commons Pooling approach to MethodInvocations
easy to implement. (However I would be surprised if there's much gain from
doing that as such short-lived objects never get out of eden.)

Now it would be nice if it were possible to get a CGLIB proxy that didn't
override the methods with no advice. Is this possible? I'll look in the
docs.

Regards,
Rod

____________________________________________________
Rod Johnson
J2EE Consultant and Author
+44 7973 409 132
rod...@in...

Author of "Expert One-on-One J2EE Design and Development"
(October 2002).
http://www.amazon.com/exec/obidos/tg/detail/-/0764543857/

Founder, Spring Framework:
http://www.springframework.org

"Introducing the Spring Framework" (ServerSide article)
http://www.theserverside.com/resources/article.jsp?l=SpringFramework