- Pharo-users - lists.pharo.org

Re: [Pharo-users] Making objects persistent

by stepharo

Le 15/1/15 06:06, sergio_101 a Ã©crit : > I am building a seaside application, and am in the process of building > my models and unit tests. > > I have a few objects that build up my data by creating objects. > > when i run the data creation methods, everything is fine. immediately > afterward, since these objects to belong to anything, they are cleaned > up by garbage collection. > > is there a way to create these objects so that they persist? if this > is possible, how would you go about deleting such a tenacious object? You should have an object pointing to them. > > thanks!

Jan. 15, 2015

Making objects persistent

by sergio_101

I am building a seaside application, and am in the process of building my models and unit tests. I have a few objects that build up my data by creating objects. when i run the data creation methods, everything is fine. immediately afterward, since these objects to belong to anything, they are cleaned up by garbage collection. is there a way to create these objects so that they persist? if this is possible, how would you go about deleting such a tenacious object? thanks!

Jan. 15, 2015

How to keep the system updated?

by Laura Risani

How do i keep the system updated? Should i just wait to the next version release or should i do something in the the midtime? I was feeling curious about World Menu> System> Software update , i tried it (having saved the image) and after downloading some packages lots of predebug windows showed up and the theme i use distorted.

Jan. 15, 2015

Re: [Pharo-users] Useful tools?

by laura

i'm afraid i posed the question too broadly to be answerable, so reformulating... What are some tools you frequently use to ease development which are neither built in the current official distribution nor domain-specific? (for example i added TilingWindowManager, RBConfigurableFormatter, many shortcuts ) Some Class Browser plug-in? I've tried adding PackageTasksPlugin beacause i found the idea interesting, but it doesn't work properly, a Predebug window keeps showing each time i move to another package. -- View this message in context: http://forum.world.st/Useful-tools-tp4799187p4799636.html Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com.

Jan. 15, 2015

Re: [Pharo-users] Becoming proficient in Pharo

by kilon alios

you asked and I delivered. A video tutorial on the debugger , deeper into live coding and a powerful tool to understand the internals of objects and their structure https://www.youtube.com/watch?v=ZE2T2D8hikE I will of course follow it with additional tutorials since its a rather big subject but this tutorial should be more than enough to get you started and make you dangerous with Pharo. Always remember to save images before changing code , for example a self halt inside Morph initialize method was more than enough to freeze my image. On Wed, Jan 14, 2015 at 5:00 PM, kilon alios <kilon.alios(a)gmail.com> wrote: > i am afraid not. But it will definitely be my next video tutorial ;) > > On Wed, Jan 14, 2015 at 4:18 PM, nacho <0800nacho(a)gmail.com> wrote: > >> Thanks! >> Kilon, is this feature included in one of your amazing videos? >> thanks >> >> >> >> >> ----- >> Nacho >> Smalltalker apprentice. >> Buenos Aires, Argentina. >> -- >> View this message in context: >> http://forum.world.st/Becoming-proficient-in-Pharo-tp4799284p4799505.html >> Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com. >> >> >

Jan. 14, 2015

Re: [Pharo-users] Notification on GC of an object?

by Ben Coman

what if the object stores a reference to itself? then you can access it from the shadow copy? On Thu, Jan 15, 2015 at 4:39 AM, Johan Fabry <jfabry(a)dcc.uchile.cl> wrote: > > Yes, in the end itâs not working out for me, sadly. I think itâs because > of that, but Iâm not sure as itâs complicated â¦ Iâll show you next week if > you want to know more. > > On Jan 14, 2015, at 16:14, Luc Fabresse <luc.fabresse(a)gmail.com> wrote: > > Hi Johan, > > Be careful, it is not the object that will execute the finalizing code but > a shallow copy of it. > It can lead to deep debugging session sometimes ;-) > > o := Object new. > WeakRegistry default add: o. "a shallow copy of o is registered" > o := nil. > Smalltalk garbageCollect. > "the shallow copy of o will receive the finalize message" > > Cheers, > > Luc > > 2015-01-14 19:13 GMT+01:00 Johan Fabry <jfabry(a)dcc.uchile.cl>: > >> >> Yes, adding it to the weak registry does the trick! Thank you Esteban for >> the pointer and Torsten for the magic line of code WeakRegistry default >> add: anObject. > > >> Being able to hook into the GC in this way is extremely cool, it saves me >> a lot of housekeeping work and I am very happy because of that ! >> >> > On Jan 13, 2015, at 17:35, Torsten Bergmann <astares(a)gmx.de> wrote: >> > >> > Esteban wrote: >> >> you also need to register the object for cleanup, in the WeakRegistry. >> >> (not on my machine, sorry I cannot put an example, but look around) >> > >> > It is simple and here is an example: >> > >> > >> > Create a class: >> > >> > Object subclass: #Bar >> > instanceVariableNames: 'id' >> > classVariableNames: '' >> > category: 'Foo' >> > >> > implemented an #initialize method >> > >> > initialize >> > super initialize. >> > id := UUID new. >> > Transcript show: 'Initialized ', id printString; cr >> > >> > and implemented a finalization method: >> > >> > finalize >> > >> > Transcript show: 'Finalized ', id printString; cr >> > >> > Now in the workspace I instantiate the object: >> > >> > |anObject| >> > Transcript open; clear. >> > anObject := Bar new. >> > Transcript flush. >> > WeakRegistry default add: anObject. >> > >> > and by forcing garbage collection in a second step I can >> > see that the finalization method is working: >> > >> > 3 timesRepeat: [ Smalltalk garbageCollect ]. >> > Transcript flush. >> > >> > >> > And I get the following output >> > >> > Initialized 4aa47ef1-0e4c-9a47-bddf-b406ee2042e4 >> > Finalized 4aa47ef1-0e4c-9a47-bddf-b406ee2042e4 >> > >> > If it doesnt work check your VM for updates. >> > >> > I'm using Pharo4.0 Latest update: #40442 on Windows with the following >> VM: >> > Win32 built on Sep 4 2014 01:13:32 Compiler: 4.6.2 VMMaker >> versionString https://github.com/pharo-project/pharo-vm.git >> > Commit: c7bc23dd6053d5f9934f7dd427537f76fc96eb32 Jenkins build #14851 >> > >> >> >> >> ---> Save our in-boxes! http://emailcharter.org <--- >> >> Johan Fabry - http://pleiad.cl/~jfabry >> PLEIAD lab - Computer Science Department (DCC) - University of Chile >> >> >> > > > > ---> Save our in-boxes! http://emailcharter.org <--- > > Johan Fabry - http://pleiad.cl/~jfabry > PLEIAD lab - Computer Science Department (DCC) - University of Chile > >

Jan. 14, 2015

Re: [Pharo-users] Notification on GC of an object?

by Johan Fabry

Yes, in the end itâs not working out for me, sadly. I think itâs because of that, but Iâm not sure as itâs complicated â¦ Iâll show you next week if you want to know more. > On Jan 14, 2015, at 16:14, Luc Fabresse <luc.fabresse(a)gmail.com> wrote: > > Hi Johan, > > Be careful, it is not the object that will execute the finalizing code but a shallow copy of it. > It can lead to deep debugging session sometimes ;-) > > o := Object new. > WeakRegistry default add: o. "a shallow copy of o is registered" > o := nil. > Smalltalk garbageCollect. > "the shallow copy of o will receive the finalize message" > > Cheers, > > Luc > > 2015-01-14 19:13 GMT+01:00 Johan Fabry <jfabry(a)dcc.uchile.cl <mailto:jfabry@dcc.uchile.cl>>: > > Yes, adding it to the weak registry does the trick! Thank you Esteban for the pointer and Torsten for the magic line of code WeakRegistry default add: anObject. > > Being able to hook into the GC in this way is extremely cool, it saves me a lot of housekeeping work and I am very happy because of that ! > > > On Jan 13, 2015, at 17:35, Torsten Bergmann <astares(a)gmx.de <mailto:astares@gmx.de>> wrote: > > > > Esteban wrote: > >> you also need to register the object for cleanup, in the WeakRegistry. > >> (not on my machine, sorry I cannot put an example, but look around) > > > > It is simple and here is an example: > > > > > > Create a class: > > > > Object subclass: #Bar > > instanceVariableNames: 'id' > > classVariableNames: '' > > category: 'Foo' > > > > implemented an #initialize method > > > > initialize > > super initialize. > > id := UUID new. > > Transcript show: 'Initialized ', id printString; cr > > > > and implemented a finalization method: > > > > finalize > > > > Transcript show: 'Finalized ', id printString; cr > > > > Now in the workspace I instantiate the object: > > > > |anObject| > > Transcript open; clear. > > anObject := Bar new. > > Transcript flush. > > WeakRegistry default add: anObject. > > > > and by forcing garbage collection in a second step I can > > see that the finalization method is working: > > > > 3 timesRepeat: [ Smalltalk garbageCollect ]. > > Transcript flush. > > > > > > And I get the following output > > > > Initialized 4aa47ef1-0e4c-9a47-bddf-b406ee2042e4 > > Finalized 4aa47ef1-0e4c-9a47-bddf-b406ee2042e4 > > > > If it doesnt work check your VM for updates. > > > > I'm using Pharo4.0 Latest update: #40442 on Windows with the following VM: > > Win32 built on Sep 4 2014 01:13:32 Compiler: 4.6.2 VMMaker versionString https://github.com/pharo-project/pharo-vm.git <https://github.com/pharo-project/pharo-vm.git> > > Commit: c7bc23dd6053d5f9934f7dd427537f76fc96eb32 Jenkins build #14851 > > > > > > ---> Save our in-boxes! http://emailcharter.org <http://emailcharter.org/> <--- > > Johan Fabry - http://pleiad.cl/~jfabry <http://pleiad.cl/~jfabry> > PLEIAD lab - Computer Science Department (DCC) - University of Chile > > > ---> Save our in-boxes! http://emailcharter.org <--- Johan Fabry - http://pleiad.cl/~jfabry PLEIAD lab - Computer Science Department (DCC) - University of Chile

Jan. 14, 2015

Re: [Pharo-users] Notification on GC of an object?

by Luc Fabresse

Hi Johan, Be careful, it is not the object that will execute the finalizing code but a shallow copy of it. It can lead to deep debugging session sometimes ;-) o := Object new. WeakRegistry default add: o. "a shallow copy of o is registered" o := nil. Smalltalk garbageCollect. "the shallow copy of o will receive the finalize message" Cheers, Luc 2015-01-14 19:13 GMT+01:00 Johan Fabry <jfabry(a)dcc.uchile.cl>: > > Yes, adding it to the weak registry does the trick! Thank you Esteban for > the pointer and Torsten for the magic line of code WeakRegistry default > add: anObject. > Being able to hook into the GC in this way is extremely cool, it saves me > a lot of housekeeping work and I am very happy because of that ! > > > On Jan 13, 2015, at 17:35, Torsten Bergmann <astares(a)gmx.de> wrote: > > > > Esteban wrote: > >> you also need to register the object for cleanup, in the WeakRegistry. > >> (not on my machine, sorry I cannot put an example, but look around) > > > > It is simple and here is an example: > > > > > > Create a class: > > > > Object subclass: #Bar > > instanceVariableNames: 'id' > > classVariableNames: '' > > category: 'Foo' > > > > implemented an #initialize method > > > > initialize > > super initialize. > > id := UUID new. > > Transcript show: 'Initialized ', id printString; cr > > > > and implemented a finalization method: > > > > finalize > > > > Transcript show: 'Finalized ', id printString; cr > > > > Now in the workspace I instantiate the object: > > > > |anObject| > > Transcript open; clear. > > anObject := Bar new. > > Transcript flush. > > WeakRegistry default add: anObject. > > > > and by forcing garbage collection in a second step I can > > see that the finalization method is working: > > > > 3 timesRepeat: [ Smalltalk garbageCollect ]. > > Transcript flush. > > > > > > And I get the following output > > > > Initialized 4aa47ef1-0e4c-9a47-bddf-b406ee2042e4 > > Finalized 4aa47ef1-0e4c-9a47-bddf-b406ee2042e4 > > > > If it doesnt work check your VM for updates. > > > > I'm using Pharo4.0 Latest update: #40442 on Windows with the following > VM: > > Win32 built on Sep 4 2014 01:13:32 Compiler: 4.6.2 VMMaker > versionString https://github.com/pharo-project/pharo-vm.git > > Commit: c7bc23dd6053d5f9934f7dd427537f76fc96eb32 Jenkins build #14851 > > > > > > ---> Save our in-boxes! http://emailcharter.org <--- > > Johan Fabry - http://pleiad.cl/~jfabry > PLEIAD lab - Computer Science Department (DCC) - University of Chile > > >

Jan. 14, 2015

Re: [Pharo-users] Notification on GC of an object?

by Johan Fabry

Yes, adding it to the weak registry does the trick! Thank you Esteban for the pointer and Torsten for the magic line of code WeakRegistry default add: anObject. Being able to hook into the GC in this way is extremely cool, it saves me a lot of housekeeping work and I am very happy because of that ! > On Jan 13, 2015, at 17:35, Torsten Bergmann <astares(a)gmx.de> wrote: > > Esteban wrote: >> you also need to register the object for cleanup, in the WeakRegistry. >> (not on my machine, sorry I cannot put an example, but look around) > > It is simple and here is an example: > > > Create a class: > > Object subclass: #Bar > instanceVariableNames: 'id' > classVariableNames: '' > category: 'Foo' > > implemented an #initialize method > > initialize > super initialize. > id := UUID new. > Transcript show: 'Initialized ', id printString; cr > > and implemented a finalization method: > > finalize > > Transcript show: 'Finalized ', id printString; cr > > Now in the workspace I instantiate the object: > > |anObject| > Transcript open; clear. > anObject := Bar new. > Transcript flush. > WeakRegistry default add: anObject. > > and by forcing garbage collection in a second step I can > see that the finalization method is working: > > 3 timesRepeat: [ Smalltalk garbageCollect ]. > Transcript flush. > > > And I get the following output > > Initialized 4aa47ef1-0e4c-9a47-bddf-b406ee2042e4 > Finalized 4aa47ef1-0e4c-9a47-bddf-b406ee2042e4 > > If it doesnt work check your VM for updates. > > I'm using Pharo4.0 Latest update: #40442 on Windows with the following VM: > Win32 built on Sep 4 2014 01:13:32 Compiler: 4.6.2 VMMaker versionString https://github.com/pharo-project/pharo-vm.git > Commit: c7bc23dd6053d5f9934f7dd427537f76fc96eb32 Jenkins build #14851 > ---> Save our in-boxes! http://emailcharter.org <--- Johan Fabry - http://pleiad.cl/~jfabry PLEIAD lab - Computer Science Department (DCC) - University of Chile

Jan. 14, 2015

Re: [Pharo-users] Becoming proficient in Pharo

by Offray Vladimir Luna CÃ¡rdenas

Hi, I totally agree with what Martin says here. In my case I was interested in Smalltalk for long time, but the game tutorial didn't catch my attention. I planned several projects to learn, but none of them where easy to start with. It was not until the expansion of Moose from software analysis to data analysis and visualization and the idea of moldable tools that I found my way to learn the program by solving a small but non trivial problem (as Sergio suggested in this thread also). Now I'm making my interactive documentation platform for data narratives and visualization. I can start small and hopefully with this tool introduce newbies to the internals of Pharo/Smalltalk as we need them. It's a still buggie but useful tool for me. My way yo introduce others to this will be by workshops in our local hackerspace. We're documenting everything and creating non-English docs for Spanish speakers. We will share them when they're in better shape. Cheers, Offray El 13/01/15 a las 12:13, Martin BÃ¤hr escribiÃ³: > Excerpts from nacho's message of 2015-01-13 15:13:41 +0100: >> As I struggle, not without fun of course, to learn more about Pharo and its >> frameworks and idea came to my mind. >> We could put together some guidelines on how to become proficient in Pharo, >> and eventually come to be a power user and / or a developer. >> I read several of this recommendations on various list of other programming >> languages. >> Basically the idea is to have some sort of guide, with theoretical and >> practical stuff. >> For example: >> *Beginners.* >> *Intermediate* >> *Advanced* >> etc, etc, etc >> >> Like a road map to becoming a serious Pharo users and / or developer. I know > > one thing i noticed, is that such guides need to be topical. > as a web developer i am not interested in GUI stuff, and if i have to go > through tutorials that teach me how to build games than that's not very > motivating. > > fortunately there are several web tutorials out there, but not all of them > assume a pharo newbie, but expect me to learn pharo first (which brings me back > to the game tutorial) > > one advantage pharo has is that new users need to learn the IDE and smalltalk > at the same time. kind of like learning eclipse and java at the same time. i > could learn eclipse using another language i already know, and i could learn > java without using eclipse, but i can't really learn smalltalk without learning > the IDE at the same time. > > so a new-user tutorial needs to explain every step in the IDE while teaching > the language. > > a good example for a tutorial on the web-side is > http://zn.stfx.eu/zn/build-and-deploy-1st-webapp/ > > it does not assume any prior knowledge about pharo, yet it is sufficiently high > level that it will be interesting for an experienced developer (like me) > > even a person without programming experience will complete this tutorial > successfully. i just had two students go through this tutorial during google > code-in with more success than i had for other tutorials. > > one of them just started to learn programming, so throughout the tutorial he > didn't really understand all of what he was doing there, but understanding > comes from practice, and a few more tutorials and a good book or course on > programming basics, and he'll get it. > > another aspect where this tutorial shines is, that it not only covers coding, > but also deployment and packaging. the only thing missing is testing and > debugging. in other words it introduces me to the major aspects i'd need to > know to start building websites. > >> Just an idea, it will be collaborative. I volunteer to keep and maintain the >> list updated in a place where it will be available to anyone but of course >> can't contribute much besides doing that. > > as i am involved as mentor for code-in, semester of code and summer of code > programs with a few smalltalk projects, i'll likely have more opportunities to > test different approaches to get started, and hopefully will be able to provide > more input. > > greetings, martin. >

Jan. 14, 2015