I personally don't think, that the performance differences can be
described as some constant factors. It heavily depends on your environment.
Maybe a raw call of a interceptor and service if both do nothing may
vary by a factor of even some hundred percents.
But as soon as your service and interceptor perform some reasonable
business logic, the infrastructure overhead won't be noticeable.
The main difference between JDK proxies and JavaAssist seems to be
the use of reflection in the first case. I once made some tests
comparing the performance of direct calls with that of reflection calls
and wasn't even able to measure any significant difference in a real
world scenario.
A hot spot vm is doing a lot of optimization here.
But look here for some other numbers:
http://www-106.ibm.com/developerworks/java/library/j-dyn0603/
Achim Huegen
Michael Mattox wrote:
Greetings,
I'm interested in using HiveMind for dependency injection and I'm very
interested in using the interceptors. I've been researching the
performance aspects and so far what I've seen has been pretty vague. I've
read that with JDK 1.5 the JDK dynamic proxy performance is about 1.5
times slower. That's a big hit for my application if I'm using these
interceptors for all calls to all my services. I then read that CGLIB has
a drop-in replacement for the JDK dynamic proxies but I cannot find any
performance measurements, especially for JDK 1.5. Finally I read in the
HiveMind documentation that JavAssist gives a "slight" perf advantage but
in several instances it was stated that it greatly increases the
development complexity. I'm curious what the performance increase is
exactly. If Javassist is only 1.4 times slower, then I think it's not
worth it. 1.1 times and it may be worth it. I'm hoping to get some
feedback on this because creating a little prototype will take some time
although I'm starting to think it may be worth it.
Thanks
Michael
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