April 2021 - Pharo-users - lists.pharo.org

Re: [Esug-list] Mooc on Advanced OO design looking for interested teachers.

by Noury Bouraqadi

Hi Stef, I'll be interested for my university :-) Noury On Apr 23 2021, at 12:41 pm, StÃ©phane Ducasse <stephane.ducasse(a)inria.fr> wrote: > Hello > > Iâm starting to write a Mooc on Advanced OO design. > It will be in the same format that the Pharo Mooc. > I would like to know if some of you can be interested using part of this mooc in their curriculum. > It will help me for a funding agency Iâm applying to. > > S. > > > -------------------------------------------- > StÃ©phane Ducasse > http://stephane.ducasse.free.fr / http://www.pharo.org > 03 59 35 87 52 > Assistant: Aurore Dalle > FAX 03 59 57 78 50 > TEL 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 > > > > > > > > > > _______________________________________________ > Esug-list mailing list -- esug-list(a)lists.esug.org > To unsubscribe send an email to esug-list-leave(a)lists.esug.org

April 23, 2021

Mooc on Advanced OO design looking for interested teachers.

by StÃ©phane Ducasse

Hello Iâm starting to write a Mooc on Advanced OO design. It will be in the same format that the Pharo Mooc. I would like to know if some of you can be interested using part of this mooc in their curriculum. It will help me for a funding agency Iâm applying to. S. -------------------------------------------- StÃ©phane Ducasse http://stephane.ducasse.free.fr / http://www.pharo.org 03 59 35 87 52 Assistant: Aurore Dalle FAX 03 59 57 78 50 TEL 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

April 23, 2021

Announcements - and whether its bad to check if a subscription would be handled?

by Tim Mackinnon

Hi everyone - Iâve always thought the article on announcements many years ago was very cool - and we donât seem to use them as much as we could (but equally they arenât a panacea to be overused everywhere either - and they do get used in Pharo to some extent). Anyway, Iâve been playing around with CodeParadise (CP is a very cool project, and Erik is very supportive and thinking about how to write web apps a different wayâ¦ Iâm fascinated), And - CP uses announcements as mechanism to send events from the View Client (in a web browser) to a Presenter on the server (which makes total sense). In taking things for a spin, I hit an interesting problem on how in a web component world, you should display a spelling test of words - e.g. SpellingTest â has many â> SpellingWord(s). Initially I bunged it all in a single presenter with its associated view, and it was a bit messy, and Erik guided me down a route (that CP nicely supports) - that my SpellingTest view should have the name/date of the test as well as an add word input field, but the list of current Words (which I had bunged into a table) - were actually more elegant as sub-components - hence a WordView - which renders a single word in a DIV, and for the edit screen I was creating, a Delete button next to the word (so you could delete it). So a 1 to many relationship essentials. This is where the announcements kick in (and lead to my ultimate question). When you click the Delete button, if I use a sub component - my view will generate a DeleteWordAnnouncement - which gets fed to my SpellingWordPresenter - however words in this sense donât naturally know their parent (the SpellingTest) - and its the parent test that has a #deleteWord: method. Iâve been taking with Erik, on different ways to elegantly handle this. a) you could change the model so words know their parent (in my case, Iâm using a 3rd party model for Flashcards, and they just donât know this - and adapting them would be a nuisance b) my TestPresenter could listen to announcements on the WordPresenter - and I could get some communications between presenters (although normally the Presenters just get events from Views, and pure domain models - so it feels a bit abnormal to consider another Presenter as a sort of model - but I could live with this c) given the composable nature of views/presenters (and CP is base on a WebComponent model) - you could bubble up Announcements, so that if an event isnât handled by a viewâs immediate presenter, you could re-route it to the parent of the View (the component owner) and see if itâs presenter could do something. I think (c) has a certain expectation to it - in fact when I converted my initial one-presenter attempt into components, I still had listener code in my TestPresenter that was expecting to get a deleteWord announcement and I was initially surprised that I wasnât getting it (as it was now just going to the Word component I had refactored out). So I wonder if others here would expect things to work this way too (and are there other examples in the wild that lead you here - or scare you away from this?). Back to my Announcement question - if C is a good idea - why doesnât the Announcer class let you check if if will handle a particular announcement? The API has #hasSubscriber: and #hasSubscriberClass: , but its missing: hasSubscriptionsHandling: anAnnouncement "Answer true if I have any subcribers to anAnnouncement" ^(registry subscriptionsHandling: anAnnouncement ) notEmpty And I am wondering if this is because it's a bad thing to expect to be able to check? In my case above, I would want to do this to know if CP should instead try announcing a message to a parent presenter because the current presenter wonât handle it. In my example above, my WordComponentView will broadcast that the delete button was clicked, but its actually a parent view which would reasonably want to listen to this kind of event and process the delete. And in a many words scenario (the Test has many words), its unrealistic for the parent to register to listen to each word component individually (in fact CP sort of hides this from you), however if you could listen to an event in your TestView, it seems to come out quite nicely - and looks a bit like this: viewCreated super viewCreated. self view when: CpNavigationAnnouncement do: [ :action | self model goto: action location ]; when: CpAddWordAnnouncement do: [ :action | self addWord: action data ]; when: CpDeleteWordAnnouncement do: [ :action | self deleteWord: action data ]. <â this is the one Iâm talking about So Iâm curious on the overall thought process here, but in particular whether I should even submit a PR on Announcer for #hasSubscriptionsHandling: ? Tim

April 22, 2021

Have you performed software migration or library update

by Oleksandr Zaytsev

Hello, I am working on a paper about different types of library update (also known as library migration). And I would like to know if you have any experience that I could document. Most modern software depends on many external libraries. And when one of those libraries releases a new version, developers have to update their code according to the changes (e.g. stop using deprecated features, make use of the new functionality, replace old classes with new ones, etc.). Please let me know if you have ever updated your software to a new version of an external library. This may include Pharo libraries (for example, Spec -> Spec2, Roassal2 -> Roassal3, etc.), Java libraries (Maven, Xerces, Log4j, etc.), JavaScript, Python, or any other programming language. I would like to know how much time did it take you to update your code, what kind of changes did you have to make, what problems did you encounter, where did you look for the information on what was changed. I would be very grateful for your help! Oleksandr

April 22, 2021

[ANN] Superluminal v2.1.0 [v2.1.0] released!

by Buenos Aires Smalltalk

April 22, 2021

[ANN] Stargate-Consul v2.1.0 [v2.1.0] released!

by Buenos Aires Smalltalk

April 22, 2021

Re: Seaside disappearing under Windows

by Christopher Fuhrman

I second trying Pharo under WSL for robustness. I wrote a blog entry on how to set it up, and I think it's still valid: https://fuhrmanator.github.io/2019/02/27/Pharo-in-WSL.html - Since you'd be using WSL2, you have to do things differently for the DISPLAY variable: https://github.com/microsoft/WSL/issues/4793#issuecomment-588321333 As to the question of why Windows on Pharo is less stable, I have some experience using over the years other programs ported to Windows from OSS, e.g., LyX and InkScape. I have seen a repeating pattern: key OSS devs of certain libraries are hyper-sensitive to how things are done in Windows (rightly so, some things are very different and require creative solutions that break when Windows changes). We all know OSS resources are limited. Consequently the libraries don't get the love.or testing they need. Despite this I think the Pharo team does a great job supporting Windows. On Thu, 22 Apr 2021 at 15:39, Petter <petter.egesund(a)gmail.com> wrote: > It might be worth trying to run Pharo under wsl if you have to go Windows? > I > do on my job laptop and it works fine for me. > > > > -- > Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html > -- Christopher Fuhrman, P.Eng., PhD *Professeur au DÃ©partement de gÃ©nie logiciel et des technologies de l'informationÃTS (Ãcole de technologie supÃ©rieure)* http://profs.etsmtl.ca/cfuhrman +1 514 396 8638 *L'ÃTS est une constituante de l'UniversitÃ© du QuÃ©bec*

April 22, 2021

Comparing source code declarations with #=

by HernÃ¡n Morales Durand

Hi, I want to compare Pharo (8) source code definitions. One source is already "filed in" the image and the other source is in a .st file in chunk format (the result of a file out). I've attached in this mail an example for reproducibility. In my search for a simple equality operator, I found that MCSnapshot(s) understand #= so it could be used like this: | imageSnapshot fileSnapshot | 'MySampleClass.st' asFileReference fileIn. imageSnapshot := (RPackageOrganizer default packageOf: MySampleClass) mcPackage snapshot. fileSnapshot := (MCStReader on: 'MySampleClass.st' asFileReference readStream) snapshot. imageSnapshot = fileSnapshot. But to my surprise, the file snapshot from MCStReader is not reading the class definitions, so comparing them should answer <true> (assuming nothing has been modified) but it always returns <false>. I've also seen that both Ring chunk importers do not read methods. (RingChunkImporter fromStream: 'MySampleClass.st' asFileReference readStream) packages collect: #allMethods. (RGChunkImporter fromStream: 'MySampleClass.st' asFileReference readStream) packages collect: #allMethods. The only "solution" I've found so far is to read into CodeChunk's and then implement the #= CodeImporter chunksFromFileNamed: 'MySampleClass.st'. But I don't like it and also I think there should be a clever way to compare source between image and .st declarations. Any ideas? HernÃ¡n

April 22, 2021

[ANN] Hyperspace v2.6.0 [v2.6.0] released!

by Buenos Aires Smalltalk

April 22, 2021

Re: Seaside disappearing under Windows

by Petter

It might be worth trying to run Pharo under wsl if you have to go Windows? I do on my job laptop and it works fine for me. -- Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html

April 22, 2021