Re: [Pharo-users] Messages interceptions without using "halt"

April 26, 2016

      2016-04-26 15:07 GMT+02:00 Esteban Lorenzano <estebanlm@gmail.com>:
...
it is not what MetaLinks are for?
I think is easier than Ghost nowadaysâ¦ but not sure :)
look at
ReflectivityControlTest>>testBeforeSend
seems to be installing an interception âbefore sendâ, who is what you are
asking for.
It depends if it is an interception before send or an interception before
receive ;)

If one is to change the method lookup, then this is done at the receiver
end of the message send, and, then, I think a ghost is more appropriate. Or
metalinks upon entry to the receiver method (i.e. method wrappers type of
thing).

Thierry
...
Esteban
ps: but I might be wrongâ¦ Marcus can explain better :)
On 26 Apr 2016, at 14:50, Thierry Goubier <thierry.goubier@gmail.com>
wrote:
Hi Steven,
2016-04-26 14:39 GMT+02:00 Steven Costiou <steven.costiou@kloum.io>:
...
Hello,
i am not new to Pharo nor to the list but this is the first time i speak
here, so : hi =)
I started a phd a few month ago (with Alain Plantec) on context oriented
programming and dynamic programs adaptation. I am using Pharo for my
experiments and i would like to intercept messages sent to an object just
before they get to their receiver. To be more specific, when #msg is sent
to an object o, i want to be able to intercept it just before it is
actually executed with the following objects at my disposal : the receiver
(o), the message or selector, the sender. My objective by doing that is to
(try to) change the lookup for a given method, and to be able to choose in
which class the lookup will start.
I have been looking a bit and it does not seem to be a "simple" way to do
that in Pharo. Is that even possible and if so, any advice on where i
should look ?
The easiest would be to use proxy or ghost objects, which catches all
message sends to a proxy of the real object and let you decide what to do
with them. A recent announcement on Ghosts for Pharo 5 was done, maybe
starting with that could be an idea.
http://forum.world.st/Ann-New-version-of-Ghost-td4886357.html
For old timers: wasn't Actalk done that way ?
Thierry
...
Thanks,
Steven.