January 2019 - Pharo-users - lists.pharo.org

Vote for the Pharo Mooc
by Alidra Abdelghani Jan. 10, 2019

Jan. 10, 2019

Hi folks, You can now vote for the Mooc of the year on : http://r.news1.fun-mooc.fr/mk/cl/4hV61iNLo1hKaNwqtQNyMTHoEhJD-d6CY0tH22cxzh… Please vote for âProgrammation objet immersive en Pharo / Live Object Programming in Pharoâ the super fun and instructive mooc :) Abdelghani On 29 Dec 2018, at 3:41 am, Fun-Mooc <news(a)fun-mooc.fr> wrote: MOOC of the year 2019 : Votez pour le MOOC de votre choix ! <http://r.news1.fun-mooc.fr/mk/cl/diTkixS7LwpKWB2RmaotIs5wEXGmvvOY5P15P47ODM…> Le mois de janvier 2019 sera pour FUN, un mois riche en Ã©vÃ©nements. Notamment avec la cÃ©rÃ©mone des âMOOC of the yearâ qui aura lieu le 30 janvier prochain. Cet Ã©vÃ©nement est initiÃ© par âMy MOOCâ, plateforme qui rÃ©fÃ©rence plus de 10 000 MOOC, dont ceux diffusÃ©s par France UniversitÃ© NumÃ©rique. Les apprenants peuvent voter pour le MOOC de l'annÃ©e 2018 : votez pour un MOOC de FUN !

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NeoJSON Custom Mapping Question
by Eric Gade Jan. 10, 2019

Jan. 10, 2019

Hey guys, I'm toying with the idea of a Pharo implementation of ActivityStreams ( https://www.w3.org/TR/activitystreams-core/#introduction) which is based on a subset of JSON called JSON-LD (for "linked data"). While I do not believe this would entail creating a whole JSON-LD implementation, I do have a question about how to implement reading/writing/mapping to and from the core set of object types in the specification. I am aware that giving any class #neoJsonMapping allows one to define the specifics of the mapping to and from objects of that class (I think this is super cool, by the way). The issue with ActivityStreams objects is that the "type" of object they represent is in the JSON itself as the property "type," for example: ``` { "@context": "https://www.w3.org/ns/activitystreams", "name": "A simple note", "type": "Note", "id": "http://www.test.example/notes/1", "content": "A simple note", "replies": { "type": "Collection", "totalItems": 1, "items": [ { "name": "A response to the note", "type": "Note", "content": "A response to the note", "inReplyTo": "http://www.test.example/notes/1" } ] } } ``` This refers to a top level ActivityStream object of type "Note" which we maybe want to parse into something like `ASNote`. My core question is this: how can we get a NeoJSONReader to determine which type of object to create by checking for a "type" property as soon as possible in the process? Because this property can show up in any order, we won't know what type of object to create until it is encountered. What is the best strategy there? Does the complexity suggest that we should simply parse incoming ActivityStream objects into the collection-and-dict default mapping and deal with creating the appropriate objects after that? In this case we could still use the custom mapping for the writing, which is not a problem since the "type" field will be associated with the class (ie, ASNote class >> #type will respond with 'Note' and we can go from there). Any thoughts or suggestions much appreciated! -- Eric

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Re: [Pharo-users] Library to use multi-core in Pharo?
by Ben Coman Jan. 10, 2019

Jan. 10, 2019

On Thu, 10 Jan 2019 at 00:19, Alexandre Bergel via Pharo-users < pharo-users(a)lists.pharo.org> wrote: > Hi! > > Is there an effort to easily use multi-core or native processes in Pharo? > I am thinking about a library that offer a construct like: > > future := Runner runInDifferentProcess: [ âThis block is run in a > different OS processâ ] > > That would save the image under a different name, use OSSubProcess to > launch a new Pharo with no UI. > > Is there a library available? > maybe not the full answer you were hoping for, but just you a side thought... One thing I've been curious about for a while is how the system might behave if via FFI you call fork() or clone(), and use Kilon's CPP Bridge [1] for return values. [1] https://github.com/kilon/CPP cheers -ben

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Re: [Pharo-users] Library to use multi-core in Pharo?
by Pierce Ng Jan. 10, 2019

Jan. 10, 2019

On Wed, Jan 09, 2019 at 01:18:45PM -0300, Alexandre Bergel via Pharo-users wrote: > Is there an effort to easily use multi-core or native processes in Pharo? > I am thinking about a library that offer a construct like: There used to be a Hydra VM for Squeak: http://squeakvm.org/~sig/hydravm/devnotes.html >From the developer notes: A HydraVM encapsulates full interpreter state in single object. This allowing it to support as many as needed interpreter instances to be run using different native threads. Most of VM functions (and all primitives) now require an additional argument - interpreter instance. Pierce

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Re: [Pharo-users] [ANN] P3 version 1.1
by Tudor Girba Jan. 9, 2019

Jan. 9, 2019

Excellent. In the meantime, we extended GT4P3 a bit to also navigate Schemas and Tables' structure. For this, I introduced a few classes such as Database, Schema or Table to ease the inspection and tool creation. Itâs a bit naive for now, but it works quite well. Should these be committed to the P3 directly to enable an object-oriented API for drilling through the DB? Cheers, Doru > On Jan 6, 2019, at 9:17 PM, Sven Van Caekenberghe via Pharo-users <pharo-users(a)lists.pharo.org> wrote: > > > From: Sven Van Caekenberghe <sven(a)stfx.eu> > Subject: Re: [Pharo-users] [ANN] P3 version 1.1 > Date: January 6, 2019 at 9:17:34 PM GMT+1 > To: Any question about pharo is welcome <pharo-users(a)lists.pharo.org> > > > Nice, I just added convenience methods #listDatabases #listSchemas and #listTablesInSchema: to P3Client so you should be able to make a real browser, connection >> schemas >> tables >> contents (listDatabases is not so useful since you can only connect to 1 database at a time). > >> On 6 Jan 2019, at 00:01, Tudor Girba <tudor(a)tudorgirba.com> wrote: >> >> And with a little more code, we now have a dedicated Playground form snippet that opens the database connection without requiring any Pharo code. >> >> <gt4p3-snippet.png> >> >> Cheers, >> Doru >> >> >>> On Jan 5, 2019, at 12:02 AM, Tudor Girba <tudor(a)tudorgirba.com> wrote: >>> >>> You can now query a Postgres database from the new GT. The initial code is available here: >>> https://github.com/feenkcom/gt4p3 >>> >>> It currently looks like this: >>> <gt-inspector-p3-query.png> >>> >>> Cheers, >>> Doru >>> >>> >>> >>>> On Dec 31, 2018, at 12:33 PM, Sven Van Caekenberghe <sven(a)stfx.eu> wrote: >>>> >>>> Hi, >>>> >>>> I created a new release of P3, the modern, lean and mean PostgreSQL client for Pharo. >>>> >>>> https://github.com/svenvc/P3 >>>> >>>> Version 1.1 contains the following changes: >>>> >>>> - added support for Postgres Extended Query protocol (P3PreparedStatement) (thx Jan @jvdsandt) >>>> - added support for reading array type values (currently INTEGER[] FLOAT[] BOOLEAN[] TEXT[] VARCHAR[]) >>>> - added P3-Tests package and moved all tests there >>>> - more comments >>>> - more unit tests >>>> >>>> https://github.com/svenvc/P3/releases/tag/v1.1 >>>> >>>> >>>> Especially Jan's contribution adds a lot of functionality: the ability to work with prepared statements. >>>> >>>> Here is an example doing a batch insert of 100 records (which is more efficient). >>>> >>>> | client statement | >>>> >>>> client := P3Client url: 'psql://sven@localhost'. >>>> >>>> client execute: 'DROP TABLE IF EXISTS table1'. >>>> client execute: 'CREATE TABLE table1 (id SERIAL PRIMARY KEY, created_at TIMESTAMP DEFAULT NOW(), name TEXT)'. >>>> >>>> statement := client prepare: 'INSERT INTO table1 (name) VALUES ($1)'. >>>> statement executeBatch: ((1 to: 100) collect: [ :index | Array with: ('Text #', index printString) ]). >>>> >>>> client query: 'SELECT * FROM table1'. >>>> client execute: 'DROP TABLE table1'. >>>> >>>> statement close. >>>> client close. >>>> >>>> >>>> Season's Greetings to you all. >>>> >>>> Sven >>>> >>>> >>>> -- >>>> Sven Van Caekenberghe >>>> Proudly supporting Pharo >>>> http://pharo.org >>>> http://association.pharo.org >>>> http://consortium.pharo.org >>>> >>>> >>>> >>>> >>> >>> -- >>> www.feenk.com >>> >>> "What is more important: To be happy, or to make happy?" >>> >> >> -- >> www.feenk.com >> >> "Quality cannot be an afterthought." >> > > > > -- www.feenk.com "No matter how many recipes we know, we still value a chef."

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Re: [Pharo-users] Library to use multi-core in Pharo?
by Thierry Goubier Jan. 9, 2019

Jan. 9, 2019

Hi Alexandre, look at taskit: (https://github.com/sbragagnolo/taskit) I think it can do what you are looking for. I think that OSProcess is also able to do that via fork calls. Having minimal, light weight images without complex loading preferences and whatever would help, otherwise simply forking your current image could be faster. Thierry Le mer. 9 janv. 2019 Ã 19:42, Alexandre Bergel via Pharo-users <pharo-users(a)lists.pharo.org> a Ã©crit : > > Hi! > > Is there an effort to easily use multi-core or native processes in Pharo? > I am thinking about a library that offer a construct like: > > future := Runner runInDifferentProcess: [ âThis block is run in a different OS processâ ] > > That would save the image under a different name, use OSSubProcess to launch a new Pharo with no UI. > > Is there a library available? > > Cheers, > Alexandre > -- > _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: > Alexandre Bergel http://www.bergel.eu > ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;. > > >

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Documentation on Traits
by Konrad Hinsen Jan. 9, 2019

Jan. 9, 2019

Dear Pharo experts, Is there any documentation on traits as implemented in Pharo 7? It's easy to find discussions about the trait feature over the years, plus slides and related stuff, but I am not sure what the current actually implemented version is. I did manage to write and use a first trait (https://github.com/khinsen/EqualityThroughVariablesTrait) but there seem to be more advanced features such as slots that I don't know anything about. Cheers, Konrad.

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Re: [Pharo-users] Library to use multi-core in Pharo?
by HernÃ¡n Morales Durand Jan. 9, 2019

Jan. 9, 2019

Hi Alex, I think you could launch jobs using GNU parallel, otherwise for shared memory parallelism OpenMP is a common choice. There is an old thread: http://forum.world.st/NativeBoost-and-OpenMP-td4837865.html but no library AFAIK Cheers, HernÃ¡n El miÃ©., 9 ene. 2019 a las 16:56, Alexandre Bergel via Pharo-users (< pharo-users(a)lists.pharo.org>) escribiÃ³: > Hi! > > Is there an effort to easily use multi-core or native processes in Pharo? > I am thinking about a library that offer a construct like: > > future := Runner runInDifferentProcess: [ âThis block is run in a > different OS processâ ] > > That would save the image under a different name, use OSSubProcess to > launch a new Pharo with no UI. > > Is there a library available? > > Cheers, > Alexandre > -- > _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: > Alexandre Bergel http://www.bergel.eu > ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;. > > > >

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[REMINDER] Camp Smalltalk 2019 in Charlotte, NC at the end of March!
by Mariano Martinez Peck Jan. 9, 2019

Jan. 9, 2019

Happy New Year to All! For those that haven't heard, Instantiations is sponsoring a Camp Smalltalk on March 29th â March 31st 2019 in Charlotte, North Carolina. Please register for the event soon as spots will be limited. Event details and registration info are available at the following link: Camp Smalltalk Charlotte 2019 <https://www.eventbrite.com/e/camp-smalltalk-charlotte-2019-tickets-52380940…> Hope to see you there! -- Mariano https://twitter.com/MartinezPeck http://marianopeck.wordpress.com

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Library to use multi-core in Pharo?
by Alexandre Bergel Jan. 9, 2019

Jan. 9, 2019

Hi! Is there an effort to easily use multi-core or native processes in Pharo? I am thinking about a library that offer a construct like: future := Runner runInDifferentProcess: [ âThis block is run in a different OS processâ ] That would save the image under a different name, use OSSubProcess to launch a new Pharo with no UI. Is there a library available? Cheers, Alexandre -- _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: Alexandre Bergel http://www.bergel.eu ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;.

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