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

[ANN] Last Day for JRMPC Registration

by horrido.hobbies＠gmail.com

We only have 10 registrations. This is a major disappointment. Why the low turnout? We believe itâs because of the pandemic. High school students are tired and stressed out. The last thing theyâre thinking about is a programming competition. We will make the best of a bad situation. The competition will proceed as planned. Here is the Competition Format: [Competition Format â Object-Oriented (wordpress.com)](https://jrmpc2022.wordpress.com/2021/09/02/competition-form…) This event will be a lead-up to Camp Smalltalk Supreme next June. Both are part of the anniversary celebration of Smalltalk.

Oct. 31, 2021

Re: Strategies for (re)using HTTP client

by Sven Van Caekenberghe

Hi, > On 29 Oct 2021, at 15:42, Esteban Maringolo <emaringolo(a)gmail.com> wrote: > > Hi, > > I happened to me more than once that I have to create some REST service "client" in which I usually wrap an HTTP client inside (ZnClient in this case), and all the calls to the service, end up using the HTTP client, inside some mutex to serialize the execution. Yes, that is a good design. However, whether your REST client object wrapping a ZnClient is used by multiple concurrent threads is another decision. I would personally not do that. See further. > But I don't like that, in particular when some endpoints are better with streaming responses (large downloads) and I have to fiddle with the client and set it back to the settings before executing the request. You only can and should reuse connections to the same endpoint/service only, doing similar types of request/responses (let's say simple ones). A definitive danger point is authentication and authorization: different calls by different users might need different REST call settings, each time. Also, caching can be a problem, if user A can see / sees the cache of user B. > So, long story short... is it always safer to instantiate a new ZnClient on a per request basis since no state is shared, but I guess it is also less effective if I'm performing several requests to the same server. A new instance is definitely safer because it is cleaner. Reusing a connection is more efficient when doing multiple calls in (quick) succession. The penalty is usually pretty low, you can postpone optimising until there is an actual problem. Error handling and recovery are also harder in the reuse case (what state is the connection in ?). ZnClient does a form of automatic reconnection/retry though. > What are the recommended approaches here? > > > Esteban A. Maringolo HTH, Sven

Oct. 29, 2021

Strategies for (re)using HTTP client

by Esteban Maringolo

Hi, I happened to me more than once that I have to create some REST service "client" in which I usually wrap an HTTP client inside (ZnClient in this case), and all the calls to the service, end up using the HTTP client, inside some mutex to serialize the execution. But I don't like that, in particular when some endpoints are better with streaming responses (large downloads) and I have to fiddle with the client and set it back to the settings before executing the request. So, long story short... is it always safer to instantiate a new ZnClient on a per request basis since no state is shared, but I guess it is also less effective if I'm performing several requests to the same server. What are the recommended approaches here? Esteban A. Maringolo

Oct. 29, 2021

Can traits be removed programatically?

by Jupiter Jones

Does anyone know how to remove a trait programatically? Thanks in advance for any information. Cheers, J

Oct. 27, 2021

Re: How to indent block of text

by horrido.hobbies＠gmail.com

Thanks. I need to have this engraved on my forehead. Esteban Lorenzano wrote: > hi, > > the command is : ctrl+shift+(l or r) > Esteban > On Oct 23 2021, at 2:44 pm, horrido.hobbies(a)gmail.com wrote: > > > No. I meant this: https://stackoverflow.com/questions/13675260/how-to-indent-a-block-of-code-… > > > > Pierre Misse wrote: > > > > > Ctrl+maj+f applies the formatting, which is configurable IIRC. Is it what you're looking for? > > > On 10/22/2021 10:35 PM, horrido.hobbies(a)gmail.com wrote: > > > > > > > Has indenting text changed in Pharo? Ctrl-Alt-R and Ctrl-Alt-L donât work for me anymore. > > > > Thanks.

Oct. 23, 2021

Re: How to indent block of text

by Esteban Lorenzano

hi, the command is : ctrl+shift+(l or r) Esteban On Oct 23 2021, at 2:44 pm, horrido.hobbies(a)gmail.com wrote: > No. I meant this: https://stackoverflow.com/questions/13675260/how-to-indent-a-block-of-code-… > > > > Pierre Misse wrote: > > Ctrl+maj+f applies the formatting, which is configurable IIRC. Is it what you're looking for? > > On 10/22/2021 10:35 PM, horrido.hobbies(a)gmail.com wrote: > > > Has indenting text changed in Pharo? Ctrl-Alt-R and Ctrl-Alt-L donât work for me anymore. > > > Thanks.

Oct. 23, 2021

Re: How to indent block of text

by horrido.hobbies＠gmail.com

No. I meant this: https://stackoverflow.com/questions/13675260/how-to-indent-a-block-of-code-… Pierre Misse wrote: > Ctrl+maj+f applies the formatting, which is configurable IIRC. > Is it what you're looking for? > > On 10/22/2021 10:35 PM, horrido.hobbies(a)gmail.com wrote: > > > Has indenting text changed in Pharo? Ctrl-Alt-R and Ctrl-Alt-L donât > > work for me anymore. > > > > Thanks.

Oct. 23, 2021

Re: How to indent block of text

by Pierre Misse

Ctrl+maj+f applies the formatting, which is configurable IIRC. Is it what you're looking for? On 10/22/2021 10:35 PM, horrido.hobbies(a)gmail.com wrote: > > Has indenting text changed in Pharo? Ctrl-Alt-R and Ctrl-Alt-L donât > work for me anymore. > > Thanks. >

Oct. 23, 2021

How to indent block of text

by horrido.hobbies＠gmail.com

Has indenting text changed in Pharo? Ctrl-Alt-R and Ctrl-Alt-L donât work for me anymore. Thanks.

Oct. 22, 2021

Book the dates: Pharo Days 2021: 3/4 March 2022 @ Lille

by stephane ducasse

Dear Pharoers We are super excited to announce the dates of the next Pharo Days. Pharo Days 2021 will be held at Lille 3/4 March 2022 We will set soon a program and a website. Stay tuned. S.

Oct. 22, 2021

Re: Create keyboard shortcut

by mspgate＠gmail.com

thanks a lot Guille, this is a good tip!

Oct. 20, 2021

Re: Create keyboard shortcut

by Guillermo Polito

Hi peace.d, Iâve had a quick look: you can inspire yourself from the class ToolShortcutsCategory. The class has a couple of special things: - it inherits from KMCategory (a keymapping framework class) - it defines `isGlobal` returning true on the class side (to say it defines global shortcuts) - it then has methods defining shortcuts: openUnitTestRunner <shortcut> ^ KMKeymap shortcut: PharoShortcuts current openTestRunnerShortcut action: [ Smalltalk tools openTestRunner ] If you want a shortcut only to be active on a particular tool/window, AND youâre using morphic, take a look at the methods in the Morph class related to keymappings: Cheers, Guille > El 20 oct 2021, a las 10:53, mspgate(a)gmail.com escribiÃ³: > > Hello everybody, > > how would I create a keyboard shortcut for a method I have defined in my class or package? > > for example if I would like to have a keyboard shortcut for a method that opens the Transcript and display the âHello I am the new shortcutâ message? > > > > thanks for the help. > > peace.d >

Oct. 20, 2021

Create keyboard shortcut

by mspgate＠gmail.com

Hello everybody, how would I create a keyboard shortcut for a method I have defined in my class or package? for example if I would like to have a keyboard shortcut for a method that opens the Transcript and display the âHello I am the new shortcutâ message? thanks for the help. peace.d

Oct. 20, 2021

Artefact utf8-textjustify and pagination

by Oswall Verny Arguedas C.

Greetings, I am starting with Artefact for pdf in Seaside App. Documents are contracts. I do not achieve the following functions: -Justification of text in paragraphs. -Pagination. -Letters with accents Ã¡ Ã© Ã Ã³ Ãº Ã± Ã (utf8) or (iso8859-1). These functions are possible?. Thanks in advance Oswall

Oct. 19, 2021

Re: Splitting a single HTTP Request into multiple concurrent requests

by Sven Van Caekenberghe

> On 19 Oct 2021, at 00:17, Yanni Chiu <yannix7db(a)gmail.com> wrote: > > A good use case is when one of the downloads fails. When itâs just one big one then you have start over from the beginning. Yes, that is a good use case for the Range feature. It is possible to configure ZnClient to retry when a request fails, for example: client numberOfRetries: 3; retryDelay: 2 "seconds". could be added to the example. > On Mon, Oct 18, 2021 at 11:05 AM Sven Van Caekenberghe <sven(a)stfx.eu> wrote: > Hi, > > Somebody asked how you would split single HTTP Request into multiple concurrent requests. This is one way to do it. > > Upfront I should state that > > - I do no think this is worth the trouble > - It is only applicable to large downloads (even larger than in the example) > - The other side (server) must honour Range requests correctly (and be fast) > > This one is based on the data used in the ZnHTTPSTest(s)>>#testTransfers units test. More specifically the files available under https://s3-eu-west-1.amazonaws.com/public-stfx-eu/ such as https://s3-eu-west-1.amazonaws.com/public-stfx-eu/test-2050.txt for the smallest one. > > sizes := (Integer primesUpTo: 100) collect: [ :each | 1024 * each + each ]. > > size := sizes last. > concurrency := 11. > step := size // concurrency. > > ranges := (0 to: size - 1 by: step) collect: [ :each | > { each. (each + step) min: size } ]. > > chunks := Array new: ranges size. > done := Semaphore new. > ms := 0. > > [ > ms := Time millisecondClockValue. > ranges withIndexDo: [ :range :index | > [ | client | > (client := ZnClient new) > https; > host: 's3-eu-west-1.amazonaws.com'; > addPath: 'public-stfx-eu'. > client addPath: ('test-{1}.txt' format: { size }). > client headerAt: #Range put: ('bytes={1}-{2}' format: range). > client get. > client close. > chunks at: index put: client contents. > done signal ] forkAt: Processor lowIOPriority ]. > ranges size timesRepeat: [ done wait ]. > ms := Time millisecondsSince: ms. > (String empty join: chunks) inspect. > ] fork. > > This takes about 2 seconds total for me. > > [ > ZnClient new > https; > host: 's3-eu-west-1.amazonaws.com'; > addPath: 'public-stfx-eu'; > addPath: 'test-99425.txt'; > get. > ] timeToRun. > > Which is roughly similar to the single request (again, for me). > > Two things to note: connection time dominates, in the parallel case, 11 independent requests were executed, so concurrency is definitively happening. > > The largest size file is just 100k, split in about 10 parts, which is most probably not enough to see much effect from doing things in parallel. > > HTH, > > Sven

Oct. 19, 2021

Re: Splitting a single HTTP Request into multiple concurrent requests

by Yanni Chiu

A good use case is when one of the downloads fails. When itâs just one big one then you have start over from the beginning. On Mon, Oct 18, 2021 at 11:05 AM Sven Van Caekenberghe <sven(a)stfx.eu> wrote: > Hi, > > Somebody asked how you would split single HTTP Request into multiple > concurrent requests. This is one way to do it. > > Upfront I should state that > > - I do no think this is worth the trouble > - It is only applicable to large downloads (even larger than in the > example) > - The other side (server) must honour Range requests correctly (and be > fast) > > This one is based on the data used in the ZnHTTPSTest(s)>>#testTransfers > units test. More specifically the files available under > https://s3-eu-west-1.amazonaws.com/public-stfx-eu/ such as > https://s3-eu-west-1.amazonaws.com/public-stfx-eu/test-2050.txt for the > smallest one. > > sizes := (Integer primesUpTo: 100) collect: [ :each | 1024 * each + each ]. > > size := sizes last. > concurrency := 11. > step := size // concurrency. > > ranges := (0 to: size - 1 by: step) collect: [ :each | > { each. (each + step) min: size } ]. > > chunks := Array new: ranges size. > done := Semaphore new. > ms := 0. > > [ > ms := Time millisecondClockValue. > ranges withIndexDo: [ :range :index | > [ | client | > (client := ZnClient new) > https; > host: 's3-eu-west-1.amazonaws.com'; > addPath: 'public-stfx-eu'. > client addPath: ('test-{1}.txt' format: { size }). > client headerAt: #Range put: ('bytes={1}-{2}' format: range). > client get. > client close. > chunks at: index put: client contents. > done signal ] forkAt: Processor lowIOPriority ]. > ranges size timesRepeat: [ done wait ]. > ms := Time millisecondsSince: ms. > (String empty join: chunks) inspect. > ] fork. > > This takes about 2 seconds total for me. > > [ > ZnClient new > https; > host: 's3-eu-west-1.amazonaws.com'; > addPath: 'public-stfx-eu'; > addPath: 'test-99425.txt'; > get. > ] timeToRun. > > Which is roughly similar to the single request (again, for me). > > Two things to note: connection time dominates, in the parallel case, 11 > independent requests were executed, so concurrency is definitively > happening. > > The largest size file is just 100k, split in about 10 parts, which is most > probably not enough to see much effect from doing things in parallel. > > HTH, > > Sven >

Oct. 18, 2021

Re: Virtual Reality-based programming environment

by Rob Raisch

I'd be interested in participating. (Oculus Quest - original) -- Rob Raisch, Internet Handyman On Tue, Oct 12, 2021 at 5:18 PM Alexandre Bergel via Pharo-users < pharo-users(a)lists.pharo.org> wrote: > Hello, > > We are a small and energetic team who want to push the state of the art in > Virtual Reality-based programming environment. > We have an advanced prototype, and we need help of participants to be part > of our experiment involving our software called VRIDE, a fully immersive VR > programming tool. > > In this experiment: > > â¢ You will be given a set of tasks to perform using our platform. The > experiment should not take more than 1 - 1.5 hours. > â¢ After that, you will have to answer some surveys and other final > questions. > > If you know how to program in Pharo, have access to a any VR device, such > as Oculus Quest or HTC Vive, and would like to be part of the experiment, > please reply to this email. The overall experiment is very enjoyable, fun, > and you will experience what we will believe programmers will use in the > future. > > We hope you are part of this. > > Regards, > Victor Segura, Leonel Merino, Alexandre Bergel and Geoffrey Hecht > -- > _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: > Alexandre Bergel http://www.bergel.eu > ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;. > > >

Oct. 18, 2021

Splitting a single HTTP Request into multiple concurrent requests

by Sven Van Caekenberghe

Hi, Somebody asked how you would split single HTTP Request into multiple concurrent requests. This is one way to do it. Upfront I should state that - I do no think this is worth the trouble - It is only applicable to large downloads (even larger than in the example) - The other side (server) must honour Range requests correctly (and be fast) This one is based on the data used in the ZnHTTPSTest(s)>>#testTransfers units test. More specifically the files available under https://s3-eu-west-1.amazonaws.com/public-stfx-eu/ such as https://s3-eu-west-1.amazonaws.com/public-stfx-eu/test-2050.txt for the smallest one. sizes := (Integer primesUpTo: 100) collect: [ :each | 1024 * each + each ]. size := sizes last. concurrency := 11. step := size // concurrency. ranges := (0 to: size - 1 by: step) collect: [ :each | { each. (each + step) min: size } ]. chunks := Array new: ranges size. done := Semaphore new. ms := 0. [ ms := Time millisecondClockValue. ranges withIndexDo: [ :range :index | [ | client | (client := ZnClient new) https; host: 's3-eu-west-1.amazonaws.com'; addPath: 'public-stfx-eu'. client addPath: ('test-{1}.txt' format: { size }). client headerAt: #Range put: ('bytes={1}-{2}' format: range). client get. client close. chunks at: index put: client contents. done signal ] forkAt: Processor lowIOPriority ]. ranges size timesRepeat: [ done wait ]. ms := Time millisecondsSince: ms. (String empty join: chunks) inspect. ] fork. This takes about 2 seconds total for me. [ ZnClient new https; host: 's3-eu-west-1.amazonaws.com'; addPath: 'public-stfx-eu'; addPath: 'test-99425.txt'; get. ] timeToRun. Which is roughly similar to the single request (again, for me). Two things to note: connection time dominates, in the parallel case, 11 independent requests were executed, so concurrency is definitively happening. The largest size file is just 100k, split in about 10 parts, which is most probably not enough to see much effect from doing things in parallel. HTH, Sven

Oct. 18, 2021

Re: Virtual Reality-based programming environment

by Jesus Mari Aguirre

Please think of me. I will be pleased to collaborate El jue., 14 oct. 2021 18:09, Alexandre Bergel via Pharo-users < pharo-users(a)lists.pharo.org> escribiÃ³: > Just as a teaser, here is what you will play with :-) > > > Cheers, > Alexandre > -- > _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: > Alexandre Bergel http://www.bergel.eu > ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;. > > > > On 12 Oct 2021, at 18:18, Alexandre Bergel via Pharo-users < > pharo-users(a)lists.pharo.org> wrote: > > Hello, > > We are a small and energetic team who want to push the state of the art in > Virtual Reality-based programming environment. > We have an advanced prototype, and we need help of participants to be part > of our experiment involving our software called VRIDE, a fully immersive VR > programming tool. > > In this experiment: > > â¢ You will be given a set of tasks to perform using our platform. The > experiment should not take more than 1 - 1.5 hours. > â¢ After that, you will have to answer some surveys and other final > questions. > > If you know how to program in Pharo, have access to a any VR device, such > as Oculus Quest or HTC Vive, and would like to be part of the experiment, > please reply to this email. The overall experiment is very enjoyable, fun, > and you will experience what we will believe programmers will use in the > future. > > We hope you are part of this. > > Regards, > Victor Segura, Leonel Merino, Alexandre Bergel and Geoffrey Hecht > -- > _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: > Alexandre Bergel http://www.bergel.eu > ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;. > > > >

Oct. 16, 2021

Re: Virtual Reality-based programming environment

by Alexandre Bergel

Just as a teaser, here is what you will play with :-) Cheers, Alexandre -- _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: Alexandre Bergel http://www.bergel.eu ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;. > On 12 Oct 2021, at 18:18, Alexandre Bergel via Pharo-users <pharo-users(a)lists.pharo.org> wrote: > > Hello, > > We are a small and energetic team who want to push the state of the art in Virtual Reality-based programming environment. > We have an advanced prototype, and we need help of participants to be part of our experiment involving our software called VRIDE, a fully immersive VR programming tool. > > In this experiment: > > â¢ You will be given a set of tasks to perform using our platform. The experiment should not take more than 1 - 1.5 hours. > â¢ After that, you will have to answer some surveys and other final questions. > > If you know how to program in Pharo, have access to a any VR device, such as Oculus Quest or HTC Vive, and would like to be part of the experiment, please reply to this email. The overall experiment is very enjoyable, fun, and you will experience what we will believe programmers will use in the future. > > We hope you are part of this. > > Regards, > Victor Segura, Leonel Merino, Alexandre Bergel and Geoffrey Hecht > -- > _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: > Alexandre Bergel http://www.bergel.eu > ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;. > >

Oct. 14, 2021

Virtual Reality-based programming environment

by Alexandre Bergel

Hello, We are a small and energetic team who want to push the state of the art in Virtual Reality-based programming environment. We have an advanced prototype, and we need help of participants to be part of our experiment involving our software called VRIDE, a fully immersive VR programming tool. In this experiment: â¢ You will be given a set of tasks to perform using our platform. The experiment should not take more than 1 - 1.5 hours. â¢ After that, you will have to answer some surveys and other final questions. If you know how to program in Pharo, have access to a any VR device, such as Oculus Quest or HTC Vive, and would like to be part of the experiment, please reply to this email. The overall experiment is very enjoyable, fun, and you will experience what we will believe programmers will use in the future. We hope you are part of this. Regards, Victor Segura, Leonel Merino, Alexandre Bergel and Geoffrey Hecht -- _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: Alexandre Bergel http://www.bergel.eu ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;.

Oct. 12, 2021

UK Smalltalk User Group meeting - Wednesday, October 27th

by Giovanni Corriga

For this month's meeting, Cincom Smalltalk ( https://www.cincomsmalltalk.com/main/ ) product manager Arden Thomas will discuss recent product changes and improvements and demonstrate some tools and features of ObjectStudio and VisualWorks 9.1. Arden ( https://twitter.com/ArdenTCST ) started working with Smalltalk in 1986, looking for a better way to do software development â and he found it. Arden built factory floor layout tools for IBM, worked at ParcPlace as an SE, an instructor, and consultant, and at a hedge fund building financial analysis tools. Arden is currently the product manager for Cincom Smalltalk. This will be an online meeting from home. If you'd like to join us, please sign up in advance on the meeting's Meetup page ( https://www.meetup.com/UKSTUG/events/280378922 ) to receive the meeting details. Donât forget to bring your laptop and drinks!

Oct. 8, 2021

Re: [Pharo-dev] possible dates for Pharo Days 2022 :)

by Jonathan van Alteren

Hi Stef, Super nice to hear you're planning Pharo Days again! Both suggestions are good for us. We'll gladly make time for this :-) Good luck! Jonathan van Alteren Guild Partner | Object Guild B.V. Software die mÃ©t je werkt +316 22500930 jonathan(a)objectguild.com On 7 Oct 2021, 12:33 +0200, stephane ducasse <stephane.ducasse(a)inria.fr>, wrote: > Hello guys > > We are super excited because we want to organise PharoDays at Lille > We are checking some possible dates and we would like to know your point of view. > right now we were thinking that > 3/4 or 10/11 march would be good. > So let us know. > > S

Oct. 7, 2021

Re: possible dates for Pharo Days 2022 :)

by Kasper Ãsterbye

If I can make it, the early days in March are OK, 10-11 is maybe (lambs could come at that time ððð) > Den 7. okt. 2021 kl. 12.34 skrev stephane ducasse <stephane.ducasse(a)inria.fr>: > > ï»¿Hello guys > > We are super excited because we want to organise PharoDays at Lille > We are checking some possible dates and we would like to know your point of view. > right now we were thinking that > 3/4 or 10/11 march would be good. > So let us know. > > S

Oct. 7, 2021

possible dates for Pharo Days 2022 :)

by stephane ducasse

Hello guys We are super excited because we want to organise PharoDays at Lille We are checking some possible dates and we would like to know your point of view. right now we were thinking that 3/4 or 10/11 march would be good. So let us know. S

Oct. 7, 2021

Re: Maintainer of smalltalk.org?

by Benoit St-Jean

Peter William Lount. Used to work with him, I'll let him know when I get back home! EnvoyÃ© Ã partir de YahooÂ Courriel sur Android Le mar., oct. 5 2021 Ã 22:25, James Foster<smalltalk(a)jgfoster.net> a Ã©critÂ : I recently came across smalltalk.orgÂ and am curious to know who maintains it. I tried sending an email to the contact but the address bounced. Thanks! James Foster

Oct. 6, 2021

Re: Maintainer of smalltalk.org?

by Esteban Lorenzano

Hi James, it is not us :) Esteban On Oct 6 2021, at 4:25 am, James Foster <smalltalk(a)jgfoster.net> wrote: > I recently came across smalltalk.org (http://smalltalk.org) and am curious to know who maintains it. I tried sending an email to the contact but the address bounced. > > Thanks! > > James Foster

Oct. 6, 2021

Maintainer of smalltalk.org?

by James Foster

I recently came across smalltalk.org <http://smalltalk.org/> and am curious to know who maintains it. I tried sending an email to the contact but the address bounced. Thanks! James Foster

Oct. 6, 2021