[aosd-discuss] Re: motivation for call vs execution pointcut/join point distinction

[Alexandre Vasseur]

Thanks

I could find some little motivations for execution when it came to
advising a "synchronized" method at first. Execution side advice will
execute with the instance having the lock.
But from a Java semantic standpoint the following is said to be
strictly equivalent:

synchronized void func() {
  // ...
}
void func() {
   synchronized(this) {
     //..
   }
}
and obviously such a refactoring would change the advice synchronize
semantic for the execution joinpoint. That could be seen as a weakness
of the execution pointcut precisely because it may introduce a point
that actually does not exist in the underlying execution environment
(though it seems to exist when looking at source artifacts or
compilation artifacts).

I am looking for use cases where ones would actually need execution
join point of Foo.foo() under the assumption that the system can
efficiently advise any call (or lets say "dispatch") to Foo.foo().
>From the scenario given so far (changing the target, proceeding in a
new thread), execution join point sounds like a limited case of call.
Aside, proceeding in a new thread can actually be done in the middle
of an advice dispatch (so called advice execution) chain.

Though I did implement (several times evolving with product/weaver
versions) execution and call join point logic and pointcut matching in
AspectWerkz, I am still not sure this concept is not an heritage from
the way we see and do the weaving (ie source code / bytecode based).
Alex




On Apr 12, 2005 1:21 AM, Michael Schuerig <michael at schuerig.de> wrote:
> On Monday 11 April 2005 22:24, Alexandre Vasseur wrote:
> > Thoughts ? I would also welcome any link or paper on that.
> 
> I've wondered the same a couple of weeks ago. See the discussion
> starting at
> 
> http://aosd.net/pipermail/discuss_aosd.net/2005-January/001322.html
> 
> </delurk>
> 
> Michael
> 
> --
> Michael Schuerig                           The more it stays the same,
> mailto:michael at schuerig.de                        The less it changes!
> http://www.schuerig.de/michael/      --Spinal Tap, The Majesty of Rock
> 
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