April 2016 - Pharo-users - lists.pharo.org

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

by Steven Costiou

Thank you ! I will look into these possibilities =) Steven.

April 26, 2016

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

by Denis Kudriashov

Hi 2016-04-26 14:39 GMT+02:00 Steven Costiou <steven.costiou(a)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 ? > I think it is not possible from image side. As I understand correctly you are going to change general message send mechanizm. You could hack VM for this.

April 26, 2016

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

by Esteban Lorenzano

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. Esteban ps: but I might be wrongâ¦ Marcus can explain better :) > On 26 Apr 2016, at 14:50, Thierry Goubier <thierry.goubier(a)gmail.com> wrote: > > Hi Steven, > > 2016-04-26 14:39 GMT+02:00 Steven Costiou <steven.costiou(a)kloum.io <mailto: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 <http://forum.world.st/Ann-New-version-of-Ghost-td4886357.html> > > For old timers: wasn't Actalk done that way ? > > Thierry > > > Thanks, > > Steven. > >

April 26, 2016

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

by Thierry Goubier

Hi Steven, 2016-04-26 14:39 GMT+02:00 Steven Costiou <steven.costiou(a)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. >

April 26, 2016

Re: [Pharo-users] ensureCreateFile

by Valentin Ryckewaert

I sent a new slice, check it and say me if it's ok for you :) 2016-04-26 11:51 GMT+02:00 Sven Van Caekenberghe <sven(a)stfx.eu>: > > > On 26 Apr 2016, at 11:49, Cyril Ferlicot Delbecque < > cyril.ferlicot(a)gmail.com> wrote: > > > > > > > > On 26/04/2016 11:31, Valentin Ryckewaert wrote: > >> I used this because here it's the folder which doesn't exist so I didn't > >> know if FileDoesNotExist were a good idea, here it's as you want. > >> > > > > In fact I did not see but there is also a DirectoryDoesNotExist :) > > Dub, I should have looked first ;-) > > > -- > > Cyril Ferlicot > > > > http://www.synectique.eu > > > > 165 Avenue Bretagne > > Lille 59000 France > > > > >

April 26, 2016

Messages interceptions without using "halt"

by Steven Costiou

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 ? Thanks, Steven.

April 26, 2016

Re: [Pharo-users] ensureCreateFile

by Sven Van Caekenberghe

> On 26 Apr 2016, at 11:49, Cyril Ferlicot Delbecque <cyril.ferlicot(a)gmail.com> wrote: > > > > On 26/04/2016 11:31, Valentin Ryckewaert wrote: >> I used this because here it's the folder which doesn't exist so I didn't >> know if FileDoesNotExist were a good idea, here it's as you want. >> > > In fact I did not see but there is also a DirectoryDoesNotExist :) Dub, I should have looked first ;-) > -- > Cyril Ferlicot > > http://www.synectique.eu > > 165 Avenue Bretagne > Lille 59000 France >

April 26, 2016

Re: [Pharo-users] ensureCreateFile

by Sven Van Caekenberghe

Why not make a subclass of FileDoesNotExist, DirectoryDoesNotExist - it is almost the same, but more specific. Good exceptions are really important. > On 26 Apr 2016, at 11:44, Cyril Ferlicot Delbecque <cyril.ferlicot(a)gmail.com> wrote: > > > > On 26/04/2016 11:31, Valentin Ryckewaert wrote: >> I used this because here it's the folder which doesn't exist so I didn't >> know if FileDoesNotExist were a good idea, here it's as you want. >> > > In Unix (at least) a directory is a file. I don't know if it's the same > in Windows. So in my opinion it's a good idea to raise a > "FileDoesNotExist". > > -- > Cyril Ferlicot > > http://www.synectique.eu > > 165 Avenue Bretagne > Lille 59000 France >

April 26, 2016

Re: [Pharo-users] ensureCreateFile

by Cyril Ferlicot Delbecque

On 26/04/2016 11:31, Valentin Ryckewaert wrote: > I used this because here it's the folder which doesn't exist so I didn't > know if FileDoesNotExist were a good idea, here it's as you want. > In fact I did not see but there is also a DirectoryDoesNotExist :) -- Cyril Ferlicot http://www.synectique.eu 165 Avenue Bretagne Lille 59000 France

April 26, 2016

Re: [Pharo-users] ensureCreateFile

by Cyril Ferlicot Delbecque

On 26/04/2016 11:31, Valentin Ryckewaert wrote: > I used this because here it's the folder which doesn't exist so I didn't > know if FileDoesNotExist were a good idea, here it's as you want. > In Unix (at least) a directory is a file. I don't know if it's the same in Windows. So in my opinion it's a good idea to raise a "FileDoesNotExist". -- Cyril Ferlicot http://www.synectique.eu 165 Avenue Bretagne Lille 59000 France

April 26, 2016