January 2017 - Pharo-users - lists.pharo.org

[ANN] Pharo Sprint Friday, Jan 27

by Marcus Denker

(this is a bit lateâ¦ next will be announced earlier. I will start to put the sprints as official events on the assoc site, too) We will organize a Pharo sprint / Moose dojo Friday, 27 Jan, starting at 10:00am. (Local Time Paris). Goals of this sprint: - Clean issue tracker to prepare for release Pharo6 - remove Pharo6 tag from not-important cases - Check Pharo5 Issues and pending back-ports Remote Sprint ============ Remotely, you can join us on Slack. During the sprint, we will try to synchronize local and remote Pharo sprinters. Known Local Sprint meeting organised ============================== We know about just one for this sprint: Lille/France: It will be at the Inria Lille, Building B, third floor (RMoD offices). As the building is not open to the public, please contact us before if you plan to come.

Jan. 26, 2017

Re: [Pharo-users] Code loading/unloading order

by Christophe Demarey

> Le 26 janv. 2017 Ã 12:25, webwarrior <reg(a)webwarrior.ws> a Ã©crit : > > Thanks. > > Reason why I ask is because I ran into some issues with slots that depended > on other classes in the package (when creating slot, like SomeSlot new > valueClass: SomeOtherClass). I had to move slots into separate package to > make it work. probably because dependency computation done by Monticello does not take into account slots. would be a good addition.

Jan. 26, 2017

Re: [Pharo-users] Code loading/unloading order

by webwarrior

Thanks. Reason why I ask is because I ran into some issues with slots that depended on other classes in the package (when creating slot, like SomeSlot new valueClass: SomeOtherClass). I had to move slots into separate package to make it work. Like when you work on your code it's all good, but then you load it in other image - and whoops... something's broken. -- View this message in context: http://forum.world.st/Code-loading-unloading-order-tp4930611p4930944.html Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com.

Jan. 26, 2017

Re: [Pharo-users] I'd really love to use Pharo this way

by Serge Stinckwich

On Wed, Jan 25, 2017 at 10:29 PM, Offray Vladimir Luna CÃ¡rdenas <offray.luna(a)mutabit.com> wrote: > Hi Jose, > > I'm building something that has ideas borrowed from Jupyter notebook[a], Leo > Editor[b] and Pharo/Smalltalk and few other original ones. The more I see > the connections between stuff like Eve[1], org-mode[2], Jupyter Lab[3], I > think that the time for literate computing[4] (a development beyond literal > programming), reproducible research and live coding is coming. > > [a] http://jupyter.org/ > [b] http://leoeditor.com/ > [1] > https://hackernoon.com/smalltalk-and-protein-programming-4da245ac93e2#.2riw… > [2] https://www.jstatsoft.org/article/view/v046i03 > [3] http://jupyterlab.github.io/jupyterlab/ > [4] > http://blog.jupyter.org/2015/07/07/project-jupyter-computational-narratives… I'm currently using Jupyter notebook with some of my students for doing simulation of dynamical systems and they love it I guess. I'm not a big fan of the UI because it still looks like a web page and the interaction is still somewhat limited compared to what you can do with Pharo. I'm also a big fan of org-mode and even more powefull than Jupyter notebooks because you can mix different computer languages at the same time and there is a real support for folding. If you remember I have done a small show us "your project" last ESUG about some experience I have done about be able to run Pharo code inside org-mode. At the moment, we are quite interested in my research group to be able to a kind of literate style of computing for modeling and simulation of complex systems like simulation of epidemiology models. This is something we can do with Jupyter but would be even more interesting in the context of Pharo. Eve looks also very interesting but I have to read more about this one. > These ideas are about expanding programming beyond programmers, for other > professionals and authors that need to use computational thinking to tackle > and talk about complex issues and themes. My approach is that these authors > are going to use document as the central metaphor for their work (in a > similar way to Mathematica notebooks) and that's why Grafoscopio is using > the notebook as the organizing concept. Grafoscopio's interactive notebooks > are tree-like documents, and soon you will be able to create custom tags to > traverse them, and produce several outputs, from a single document. > > Having Pharo as a base for the Grafoscopio development brings a powerful > environment to crystallize and explore several of the literate computing > ideas. For example, Eve's idea of "programming without order" is already > possible in Pharo (of course in both environments, you will be send to the > debugger to define what is missing). Also you can use document as the > central metaphor for organizing thinking (not classes, or protocols, or > messages) while enjoying of a continuous environment to connect documents > with Domain Specific Languages made with this "classical" objects thinking. > > Grafoscopio is my first "app" and the one I made to learn Pharo/Smalltalk. > If you are interested in exploring the literate computing ideas in Pharo, > you're welcomed to our community. I can be your peer teach what I have > learned so far, and learn with you. We have a low traffic Spanish mailing > list[5], but we can handle English there also (or in this mailing list), and > our fossil repository for documentation and issues[6]. > > [5] http://mutabit.com/grafoscopio/index.en.html#contacto > [6] http://mutabit.com/repos.fossil/grafoscopio/ > > Now I'm improving the English documentation (we have a local Spanish first > approach for documentation) so you will have a better introduction to > Grafoscopio, its usage and its community. I'll notify the community when is > done. I really like what you done until now with Grafoscopio and I will try to help and use it for own work in the future. I have to look to Fossil. Is it possible to linked in someways to git ? I was thinking that maybe that I will submit a gsoc proposal to have some support in Jupyter notebooks for Pharo. Apparently this not that difficult to built a basic support and after that we can built some elaborate on top of it. What do you about that ? Regards, -- Serge Stinckwich UCBN & UMI UMMISCO 209 (IRD/UPMC) Every DSL ends up being Smalltalk http://www.doesnotunderstand.org/

Jan. 26, 2017

Re: [Pharo-users] Deployment pharo with multiple instances and voyage

by Alejandro Infante

Cool! Thanks for the answers! Norbert mentions something interesting about references. I have found that even though on each query mongo get the up-to-date version of the objects, it does not install the proxies to look for the up-to-date versions of the references of the queried object. I made the following experiment: Having two images 1 and 2 and two classes A and B, each of them having one instance variable. âââââââââ Image 1 (Create two objects, âaâ referencing âbâ) [ |a b| a := A new. b := B new a setInstVar: b. b setInstVar: âfoo'. b save. a save. ] Image 2 (Mutates the second object, but the first is not changed) [ b := (repository selectAll: A) first instVar. b setInstVar: âbarâ. b save. ] Image 1 (Query the first object and access to the referenced object) [ b := (repository selectAll: A) first instVar. b instVar. â-> fooâ b := (repository selectAll: B) first. b instVar. â-> bar" ] This little experiment showed me that I cannot trust on the state of other objects that I have not explicitly queried for. Is there any way of solving this without creating new instances of voyage repositories for each request? Thanks! Alejandro > On Jan 25, 2017, at 7:27 AM, Esteban Lorenzano <estebanlm(a)gmail.com> wrote: > >> >> On 25 Jan 2017, at 01:30, Alejandro Infante <alejandroinfante91(a)gmail.com> wrote: >> >> Hi! >> >> Iâm close to deploy a web service using Pharo with Voyage and MongoDB. I have been playing with it and everything works ok with a single Pharo image. >> >> Couple of days ago I started questioning myself about how voyage behaves when you have multiple pharo images using the same mongo database (horizontal scaling). I want to know how the cache of voyage behaves in a scenario with object updates. >> >> Example: ââââââââââââââ >> Imagine I have two images A and B. >> >> - Image A query for object o and voyage put it in the cache. >> - Image B query for object o and voyage put it in the cache. >> - Image A updates object o and push it into the database calling #save. >> - Image B query for object o that should be already in the cache. >> >> In this case, does Image B see the changes performed by image A? >> ââââââââââââââ > > yes. > Voyage will always verify the version on the mongodb, no matter the cache, because in fact, the cache of Voyage is meant just to keep object identity (there has been discussions on if this is a real cacheâ¦ I think it is, but with a different purpose than usual). > Recently Martin enhanced that part by adding VMMongoRepository>>saveEnsuringCurrent: protocol who will also check your version is correct when writing (to avoid overwrite before update). > > So, this should be Ok :) > > Esteban > >> >> All ideas are welcome :) >> >> Thanks and cheers! >> Alejandro

Jan. 25, 2017

Re: [Pharo-users] I'd really love to use Pharo this way

by Offray Vladimir Luna CÃ¡rdenas

Hi Jose, I'm building something that has ideas borrowed from Jupyter notebook[a], Leo Editor[b] and Pharo/Smalltalk and few other original ones. The more I see the connections between stuff like Eve[1], org-mode[2], Jupyter Lab[3], I think that the time for literate computing[4] (a development beyond literal programming), reproducible research and live coding is coming. [a] http://jupyter.org/ [b] http://leoeditor.com/ [1] https://hackernoon.com/smalltalk-and-protein-programming-4da245ac93e2#.2riw… [2] https://www.jstatsoft.org/article/view/v046i03 [3] http://jupyterlab.github.io/jupyterlab/ [4] http://blog.jupyter.org/2015/07/07/project-jupyter-computational-narratives… These ideas are about expanding programming beyond programmers, for other professionals and authors that need to use computational thinking to tackle and talk about complex issues and themes. My approach is that these authors are going to use document as the central metaphor for their work (in a similar way to Mathematica notebooks) and that's why Grafoscopio is using the notebook as the organizing concept. Grafoscopio's interactive notebooks are tree-like documents, and soon you will be able to create custom tags to traverse them, and produce several outputs, from a single document. Having Pharo as a base for the Grafoscopio development brings a powerful environment to crystallize and explore several of the literate computing ideas. For example, Eve's idea of "programming without order" is already possible in Pharo (of course in both environments, you will be send to the debugger to define what is missing). Also you can use document as the central metaphor for organizing thinking (not classes, or protocols, or messages) while enjoying of a continuous environment to connect documents with Domain Specific Languages made with this "classical" objects thinking. Grafoscopio is my first "app" and the one I made to learn Pharo/Smalltalk. If you are interested in exploring the literate computing ideas in Pharo, you're welcomed to our community. I can be your peer teach what I have learned so far, and learn with you. We have a low traffic Spanish mailing list[5], but we can handle English there also (or in this mailing list), and our fossil repository for documentation and issues[6]. [5] http://mutabit.com/grafoscopio/index.en.html#contacto [6] http://mutabit.com/repos.fossil/grafoscopio/ Now I'm improving the English documentation (we have a local Spanish first approach for documentation) so you will have a better introduction to Grafoscopio, its usage and its community. I'll notify the community when is done. Cheers, Offray On 23/01/17 09:42, Jose San Leandro wrote: > Hi, > > I've come across this new attempt to bring Literate Programming to the > masses. > > http://www.witheve.com/ > > It all seem to come from Jupyter Notebook. > > I'd love to build something like that in Pharo, but I currently lack > the skills needed. Any suggestions on how to start? Would you use > Seaside, Pillar, ...?

Jan. 25, 2017

Re: [Pharo-users] Code loading/unloading order

by Guillermo Polito

Hi, I think it is not documented, and it's usually strange that people write code dependent on this order. However, to anwer your questions, you can look at MCPackageLoader>>#basicLoadDefinitions. More specific below: On Tue, Jan 24, 2017 at 3:07 PM, webwarrior <reg(a)webwarrior.ws> wrote: > It is not documented. > > What happens when I load a package? > Are all classes created first, and then methods are added, or classes are > loaded one-by-one with all their methods? > - new classes added - new (versions of) methods are compiled - old classes and methods removed - retry definitions that were erroneous - install all new methods - notifications - postloads > What about Slots? Are they added to classes after all classes are loaded? No, they are added to the class when it is created > Do > they have their methods by that time? > It depends. If the class was not loaded before, it does not have methods. If the class existed and you're loading a different version, it'll have the old methods. > What is order of loading of classes? Alphabetical, or using some resolution > mechanism, or is it implementation detail? > It looks by looking at the code that they are sorted by dependency between them (for example, superclasses before subclasses). But I did not look much further. > > What happens when I unload the package? Is it inverse of loading so order > is > reversed? > Apparently, (look at MCPackageLoader class>>#unloadPackage:) the order is reversed by dependency (first methods, then subclasses, then superclasses) Guille

Jan. 25, 2017

Two other jobs offer

by Stephane Ducasse

Begin forwarded message: *From: *"Nowak, Helge" <HNowak(a)cincom.com> *Subject: **[Esug-list] Looking for yet another 2 Smalltalk developers* *Date: *25 January 2017 at 12:36:20 GMT+1 *To: *ESUG Mailing list <esug-list(a)lists.esug.org> Dear Smalltalkers, I am looking for two Smalltalk developers. VisualWorks experience a plus. Project language is English. Other languages a plus. Location of work can be agreed upon within Germany, Benelux, France, UK. I am looking forward to hearing from you! Cheers Helge *Helge Nowak*Cincom Smalltalk Technical Account Manager EMEA <http://www.cincomsmalltalk.com/> Cincom Systems GmbH & Co. oHG Am Kronberger Hang 4 65824 Schwalbach/Ts. GERMANY <https://twitter.com/cincom> <https://www.linkedin.com/company/cincom-systems> <https://www.youtube.com/user/CincomVideo> <http://www.cincom.com/blog/feed/> office mobile fax website email +49 89 89 66 44 94 +49 172 74 00 402 +49 89 89 66 44 95 http://www.cincomsmalltalk.com hnowak(a)cincom.com *A standpoint is an intellectual horizon of radius zero. -- Albert Einstein* GeschÃ¤ftsfÃ¼hrer/Managing Directors: Thomas M. Nies, Gerald L. Shawhan oHG mit Sitz/based in Schwalbach/Ts. (Amtsgericht KÃ¶nigstein/Ts. HRA 2653) Pers. haftender Gesellschafter/Partner liable to unlimited extent: Cincom Systems Verwaltungsgesellschaft mbH (Amtsgericht KÃ¶nigstein/Ts. HRB 5069) --- CONFIDENTIALITY STATEMENT --- This e-mail transmission contains information that is intended to be privileged and confidential. It is intended only for the addressee named above. If you receive this e-mail in error, please do not read, copy or disseminate it in any manner. If you are not the intended recipient, any disclosure, copying, distribution or use of the contents of this information is prohibited, please reply to the message immediately by informing the sender that the message was misdirected. After replying, please erase it from your computer system. Your assistance in correcting this error is appreciated. _______________________________________________ Esug-list mailing list Esug-list(a)lists.esug.org http://lists.esug.org/mailman/listinfo/esug-list_lists.esug.org -------------------------------------------- StÃ©phane Ducasse http://stephane.ducasse.free.fr http://www.synectique.eu / http://www.pharo.org 03 59 35 87 52 Assistant: Julie Jonas 03 59 57 78 50 03 59 35 86 16 S. Ducasse - Inria 40, avenue Halley, Parc Scientifique de la Haute Borne, BÃ¢t.A, Park Plaza Villeneuve d'Ascq 59650 France

Jan. 25, 2017

Re: [Pharo-users] Deployment pharo with multiple instances and voyage

by Esteban Lorenzano

> On 25 Jan 2017, at 01:30, Alejandro Infante <alejandroinfante91(a)gmail.com> wrote: > > Hi! > > Iâm close to deploy a web service using Pharo with Voyage and MongoDB. I have been playing with it and everything works ok with a single Pharo image. > > Couple of days ago I started questioning myself about how voyage behaves when you have multiple pharo images using the same mongo database (horizontal scaling). I want to know how the cache of voyage behaves in a scenario with object updates. > > Example: ââââââââââââââ > Imagine I have two images A and B. > > - Image A query for object o and voyage put it in the cache. > - Image B query for object o and voyage put it in the cache. > - Image A updates object o and push it into the database calling #save. > - Image B query for object o that should be already in the cache. > > In this case, does Image B see the changes performed by image A? > ââââââââââââââ yes. Voyage will always verify the version on the mongodb, no matter the cache, because in fact, the cache of Voyage is meant just to keep object identity (there has been discussions on if this is a real cacheâ¦ I think it is, but with a different purpose than usual). Recently Martin enhanced that part by adding VMMongoRepository>>saveEnsuringCurrent: protocol who will also check your version is correct when writing (to avoid overwrite before update). So, this should be Ok :) Esteban > > All ideas are welcome :) > > Thanks and cheers! > Alejandro

Jan. 25, 2017

Re: [Pharo-users] Deployment pharo with multiple instances and voyage

by Norbert Hartl

Hi, > Am 25.01.2017 um 01:30 schrieb Alejandro Infante <alejandroinfante91(a)gmail.com>: > > Hi! > > Iâm close to deploy a web service using Pharo with Voyage and MongoDB. I have been playing with it and everything works ok with a single Pharo image. > > Couple of days ago I started questioning myself about how voyage behaves when you have multiple pharo images using the same mongo database (horizontal scaling). I want to know how the cache of voyage behaves in a scenario with object updates. > > Example: ââââââââââââââ > Imagine I have two images A and B. > > - Image A query for object o and voyage put it in the cache. > - Image B query for object o and voyage put it in the cache. > - Image A updates object o and push it into the database calling #save. > - Image B query for object o that should be already in the cache. > > In this case, does Image B see the changes performed by image A? > ââââââââââââââ > > All ideas are welcome :) > the only problems you have with the cache is its name :) It isn't really a cache. If you request an object a query is issued to the database. So your scenario is no problem because in the last step when B queries the object it queries the database, will see that the version number of the objects changed and will update the object in the cache. The sole purpose of the cache is to enable identity of database objects. Nevertheless you can have problems if you use references. Voyage can handle references pretty well. But each class might be stored in another document/collection. As in mongo only the storage of a single document is atomic you need to be careful when doing concurrent updates with references. Norbert

Jan. 25, 2017