Re: [Springframework-developer] Extending Spring AOP

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

Rob

I would favour the Java code-based approach, using Velocity. I think that should deliver extremely 
good performance, and would rather we don't commit to maintaining a byte code approach.

I don't believe there is any problem using code generation with our API. Indeed, I always meant to 
implement it, but performance optimization of the AOP framework has never been of any significance 
in practice. Only for marketing, as has been apparent recently :-)

A Java based approach should definitely allow significant optimization, and would hopefully be 
simpler than the CGLIB approach and more maintainable. So there would be a real advantage, besides 
performance. There should be a particular optimization for methods with only before or after advice, 
skipping the present use of an interceptor to wrap them. The

I would recommend hand-authoring a Java class, and benchmarking, to see exactly what the gains are, 
before putting a lot of effort into the approach. (But I'm sure they'll be large.) But I think this 
is definitely good stuff!

Rgds
Rod

Rob Harrop wrote:
> All,
> 
> I am planning to add to an additional proxy implementation to Spring to 
> solve some of the problems we are experiencing with other approaches and 
> to allow for additional optimizations and advice types to be added in 
> the most efficient way.
> 
> Currently, I'm looking at two separate approaches - Java-based using 
> Janino and Bytecode-based using SERP. The Java-based approach should be 
> quite simple to create and could be coupled with Velocity to externalize 
> much of the boilerplate code needed for the creation of proxy classes. 
> Alternatively we could add a simple abstraction layer on top of Janino, 
> a la .NET CodeDOM (good idea James). The bytecode approach is much more 
> complex and will be harder to debug but it would probably allow for 
> absolute raw performance.
> 
> I am comfortable with either approach although I think that Janino would 
> be ideal for our purposes.
> 
> Your thoughts?
> 
> Rob
> 
> 
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-- 

____________________________________________________
Rod Johnson
CEO, Interface21 - Spring Services from the Source
http://www.springframework.com

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

Author, "Expert One-on-One J2EE Development Without EJB"
(May 2004, with Juergen Hoeller).
http://www.amazon.com/exec/obidos/ASIN/0764558315/

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


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