March 2011 - Pharo-users - lists.pharo.org

Re: [Pharo-users] [squeak-dev] [ANN] ESUG supports once again SqueakDBX
by Mariano Martinez Peck March 6, 2011

March 6, 2011

On Sun, Mar 6, 2011 at 12:40 PM, Levente Uzonyi <leves(a)elte.hu> wrote: > On Fri, 4 Mar 2011, Mariano Martinez Peck wrote: > > We are really happy to announce that ESUG will sponsor us once again >> through >> the ESUG Summer Talk project. This means that we have reached the ESUG >> expectations and that they still think that relational database access is >> an >> important matter in Smalltalk. >> > > snip > > 5) Cog compatibility. >> > > What has to be done? > > Indeed, nothing. We were not sure if FFI was working on it, but it turns out that it was. The idea is to be aware if Eliot releases a threaded VM/FFI so that we do not lock the VM (even if we have our micro-lock strategy when possible) > > >> 6) Use Alien instead of FFI. >> Eliot is working on a threaded CogVM. One of the projects of the GSoC of >> this year was to make something similar to a threaded FFI. What the >> student >> did is a modification in Alien (I think) that can be run in a >> multithreaded >> envirorment. He worked with Eliot. The idea is when Eliot releases the >> threaded CogVM, this FFI would work our of the box, and would avoid >> locking >> the WHOLE vm while a C function is being invoked (as it happens today with >> FFI).....So....when that VM is released, we MUST migrate to that). >> > > How is Alien better than FFI? We do not know. However, we will not spend time in Alien unless it is working out of the box and integrated in all standard VMs. > AFAIK Alien itself is not developed anymore, > parts of it will be merged with FFI. > > Ahh ok, we didn't know. Thnkas. > > Levente > > P.S.: http://www.squeaksource.com/SqueakDBX.html states that code in the > repository has MIT license, but it includes Glorp which has LGPL(S) license. > > Yes, the problem is that SqueakDBX as itself (the database driver), is MIT. Thus, the repository is MIT. Glorp is LGPL. When we started (years after SqueakDBX) with GlorpDBX, we found it easier to commit our changes to SqueakDBX repo instead of the Glorp one (because not everybody may agree with our changes). The good news is that Alan Night was considering making Glorp MIT. I cc'ed him to see if there are news. Cheers Mariano

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Pharo-project weekly summary #4
by Francois Stephany March 6, 2011

March 6, 2011

Hi guys, The summary for this week is out. Please comment if I said something stupid or forgot something. http://articles.tulipemoutarde.be/pharo-mailing-list-weekly-summary-4 See you next week ;)

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Re: [Pharo-users] [Esug-list] [squeak-dev] [ANN] ESUG supports once againSqueakDBX
by Mariano Martinez Peck March 5, 2011

March 5, 2011

On Sat, Mar 5, 2011 at 2:47 AM, Carlos Crosetti < carlos.crosetti(a)mostar.com.ar> wrote: > My 10 cents to the SqueakDBX list of actions...... > > Long time ago, when I learnt about the VW UI Builder, I attempted to run an > existing sample code that was basically a dataset widget browsing a > collection of objects, and then I wrote some code to make them persistent > using ObjectLens and Oracle. > > Later on time, I would say 12+ years later, I learnt about GLORP and wrote > a morphic-based dialog to do the most simple CRUD model to teach myself > persisting objects into PostgreSQL using Glorp and a GUI. > > My suggestion to the SqueakDBX team is to incllude a working sample but > this time based on the Morphic UI Designer. > Got it. And what about Seaside for example? Few years back, we used to have a Seaside + GlorpDBX + SqueakDBX example that we used for the university thesis. However, I guess it is quite outdated and note sure if it works. But maybe we should do that. I think it is a good idea. In addition, we can use the same example for the PBE chapter. Finally, I remember an ESUG project which idea was a open source application based in pharo, seaside, glorp, etc, to use as an example/learning. I don't remember the name right now....but it would be awesome if that app could be changed to use GlorpDBX + SqueakDBX instead :) thanks mariano > ----- Original Message ----- > *From:* Mariano Martinez Peck <marianopeck(a)gmail.com> > *To:* GermÃ¡n Arduino <garduino(a)gmail.com> > *Cc:* ESUG Mailing list <esug-list(a)lists.esug.org> ; A friendly place > where any question about pharo is welcome<pharo-users(a)lists.gforge.inria.fr>; Pharo > Development <pharo-project(a)lists.gforge.inria.fr> ; The general-purpose > Squeak developers list <squeak-dev(a)lists.squeakfoundation.org> > *Sent:* Friday, March 04, 2011 7:53 AM > *Subject:* Re: [Esug-list] [squeak-dev] [ANN] ESUG supports once > againSqueakDBX > > > > On Fri, Mar 4, 2011 at 11:50 AM, GermÃ¡n Arduino <garduino(a)gmail.com>wrote: > >> Certainly all the Smalltalk community should thank ESUG by the >> continous support to lot of initiatives. >> >> > And to ESUG sponsors :) > and ESUG conference attendees...and...and..lots of people :) > > >> Thanks ESUG. >> >> >> 2011/3/4 Mariano Martinez Peck <marianopeck(a)gmail.com>: >> > We are really happy to announce that ESUG will sponsor us once again >> through >> > the ESUG Summer Talk project. This means that we have reached the ESUG >> > expectations and that they still think that relational database access >> is an >> > important matter in Smalltalk. >> > >> > One important thing is that we are going to rename the project (we are >> still >> > working on it) since SqueakDBX runs not only in Squeak but also in >> Pharo, >> > and there have been even ports to Dolphin. What's the reason for this >> > decision? Because we do not want to couple ourselves to a smalltalk >> dialect >> > nor to OpenDBX, because our project is much more than that (later I will >> > tell you about our plans). So, these are some of the possible names: >> > ObjectPark, SmallParking, Parktalk, SmallValet, Valetalk, ValetST, >> > NorayTalk, Ballard, Noray and Cruise. Please let us know which one is >> your >> > favourite or help us find a new one. >> > >> > Another important subject is the team. There will be three "mentors", >> > Esteban Lorenzano, Diogenes Moreira and myself, Mariano Martinez Peck; >> and >> > three students: Guillermo Polito, Nicolas Scarcella and Santiago >> Bragagnolo. >> > >> > We are open to suggestions and ideas. In addition, we have defined a >> > possible list of actions that I copy at the end of the email. >> > >> > For the moment, the url remains www.squeakdbx.org and the mailing >> > list squeakdbx(a)lists.squeakfoundation.org >> > >> > Once again, we want to thank ESUG for their support and trust. >> > >> > Thank you very much, >> > >> > SqueakDBX team >> > >> > >> > >> > >> > >> > Possible list of actions: >> > >> > 1) Change SqueakDBXâs name. >> > >> > 2) Update GLORP version since the actual one is 3 years old. >> > >> > Port it again from VisualWorks, create a VW porting tool (may be). >> > Complete support to Glorp. Today it works with PostgreSQL, Oracle and >> > MySQL. Make it work with most databases OpenDBX supports. >> > >> > 3) Create a lightweight solution, alternatively to GLORP. There are >> some >> > options: >> > >> > Make SqueakSave work with SqueakDBX. SqueakSave developers already >> > contacted us because they wanted to do it. SqueakSave seems to be 20% >> slower >> > than Glorp but you don't need to write the mappings :) >> > Adapt Ramon Leon's active record to use an abstract database driver, and >> > create a driver for SqueakDBX. >> > Port the new Glorpâs kind of active record to Pharo. (included in 2). >> > >> > 4) Write a Pharo By Example 2 chapter based on the card game Stef built >> ;). >> > >> > 5) Cog compatibility. >> > >> > 6) Use Alien instead of FFI. >> > Eliot is working on a threaded CogVM. One of the projects of the GSoC of >> > this year was to make something similar to a threaded FFI. What the >> student >> > did is a modification in Alien (I think) that can be run in a >> multithreaded >> > envirorment. He worked with Eliot. The idea is when Eliot releases the >> > threaded CogVM, this FFI would work our of the box, and would avoid >> locking >> > the WHOLE vm while a C function is being invoked (as it happens today >> with >> > FFI).....So....when that VM is released, we MUST migrate to that). >> > >> > 7) Explore performance issues (maybe with our approach of "In thread >> > execution plugin"). >> > >> > 8) Complete integration with OpenDBX. For example, Oracle, for large >> objects >> > (Clob, Blob, etc) use specific functions. There are specific functions >> in >> > OpenDBX that have to be used if the database uses specific functions >> (oracle >> > is the only one for the moment.). We don't manage those functions yet. >> > >> > 9) In this link http://www.squeakdbx.org/Targets%20and%20Features >> > You can see a list of future possible features like Connection pooling >> (now >> > it is done!), Prepared statement interface, Store procedures, Escape and >> > avoid of SQL insertion, Authentication support: extends to other >> methods, >> > not only user/password, Full text support, etc. >> > >> > >> > >> > > ------------------------------ > > _______________________________________________ > Esug-list mailing list > Esug-list(a)lists.esug.org > http://lists.esug.org/mailman/listinfo/esug-list_lists.esug.org > >

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[ANN] ESUG supports once again SqueakDBX
by Mariano Martinez Peck March 4, 2011

March 4, 2011

We are really happy to announce that ESUG will sponsor us once again through the ESUG Summer Talk project. This means that we have reached the ESUG expectations and that they still think that relational database access is an important matter in Smalltalk. One important thing is that we are going to rename the project (we are still working on it) since SqueakDBX runs not only in Squeak but also in Pharo, and there have been even ports to Dolphin. What's the reason for this decision? Because we do not want to couple ourselves to a smalltalk dialect nor to OpenDBX, because our project is much more than that (later I will tell you about our plans). So, these are some of the possible names: ObjectPark, SmallParking, Parktalk, SmallValet, Valetalk, ValetST, NorayTalk, Ballard, Noray and Cruise. Please let us know which one is your favourite or help us find a new one. Another important subject is the team. There will be three "mentors", Esteban Lorenzano, Diogenes Moreira and myself, Mariano Martinez Peck; and three students: Guillermo Polito, Nicolas Scarcella and Santiago Bragagnolo. We are open to suggestions and ideas. In addition, we have defined a possible list of actions that I copy at the end of the email. For the moment, the url remains www.squeakdbx.org and the mailing list squeakdbx(a)lists.squeakfoundation.org Once again, we want to thank ESUG for their support and trust. Thank you very much, SqueakDBX team Possible list of actions: 1) Change SqueakDBXâs name. 2) Update GLORP version since the actual one is 3 years old. Port it again from VisualWorks, create a VW porting tool (may be). Complete support to Glorp. Today it works with PostgreSQL, Oracle and MySQL. Make it work with most databases OpenDBX supports. 3) Create a lightweight solution, alternatively to GLORP. There are some options: Make SqueakSave work with SqueakDBX. SqueakSave developers already contacted us because they wanted to do it. SqueakSave seems to be 20% slower than Glorp but you don't need to write the mappings :) Adapt Ramon Leon's active record to use an abstract database driver, and create a driver for SqueakDBX. Port the new Glorpâs kind of active record to Pharo. (included in 2). 4) Write a Pharo By Example 2 chapter based on the card game Stef built ;). 5) Cog compatibility. 6) Use Alien instead of FFI. Eliot is working on a threaded CogVM. One of the projects of the GSoC of this year was to make something similar to a threaded FFI. What the student did is a modification in Alien (I think) that can be run in a multithreaded envirorment. He worked with Eliot. The idea is when Eliot releases the threaded CogVM, this FFI would work our of the box, and would avoid locking the WHOLE vm while a C function is being invoked (as it happens today with FFI).....So....when that VM is released, we MUST migrate to that). 7) Explore performance issues (maybe with our approach of "In thread execution plugin"). 8) Complete integration with OpenDBX. For example, Oracle, for large objects (Clob, Blob, etc) use specific functions. There are specific functions in OpenDBX that have to be used if the database uses specific functions (oracle is the only one for the moment.). We don't manage those functions yet. 9) In this link http://www.squeakdbx.org/Targets%20and%20Features You can see a list of future possible features like Connection pooling (now it is done!), Prepared statement interface, Store procedures, Escape and avoid of SQL insertion, Authentication support: extends to other methods, not only user/password, Full text support, etc.

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left scrollbars
by Torsten Bergmann March 2, 2011

March 2, 2011

>Hi, what is the default way of getting left scrollbars - is there a >setting? In Squeak there was a preference for that. With Polymorph (Pharo's UI framework) it looks like this is now dependent on the UI setting of the current theme. This makes sense but it always returns true at the moment. Maybe because most themes have scrollbar on right. To check just inspect: "UITheme current settings scrollBarsOnRight" See class ThemeSettings>>scrollBarsOnRight Seems like it is not yet finished (always true, no real Setting in the settings browser) If you switch to return false instead of true the layout of the standard browser is broken. At least in Pharo 1.2 You can open an issue on the bugtracker (http://issues.pharo-project.org) so we can take care of this. I also CC'ed Gary - maybe he is able to comment. Bye T. BTW: t-o = torsten Olschewski? -- GMX DSL Doppel-Flat ab 19,99 Euro/mtl.! Jetzt mit gratis Handy-Flat! http://portal.gmx.net/de/go/dsl

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Re: [Pharo-users] Is there a metric server for Pharo
by Panu Suominen March 1, 2011

March 1, 2011

2011/2/28 Marcus Denker <marcus.denker(a)inria.fr>: > There is Moose: > It has all the code for calculating metrics. (and to do visualizations based on them) I know. But the results should be stored somewhere to be publicly viewable. Preferably version information is attached to the metrics enabling monitoring if problems get fixed or introduced. > We are actually developing a reporting dashboard thing for the pharo code base... > maybe Cyrille can tell more? OK. I would like to know more. :)

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rounding errors
by t olschewski March 1, 2011

March 1, 2011

Hi, using formatted number output recently I got the following output: 1.0 printPaddedWith: $0 to: 2.1. "'01.0'" 1.0 printPaddedWith: $0 to: 2.2. "'01.00'" 1.0 printPaddedWith: $0 to: 2.3. "'01.00'" <-- wrong 1.0 printPaddedWith: $0 to: 2.4. "'01.000'" <-- wrong 1.0 printPaddedWith: $0 to: 2.5. "'01.00000'" running Float>>printPaddedWith:to: in the debugger showed me that the reason of this odd behaviour seems to be produced by Float>>truncated and/or Float>>fractionPart. I can provoke errors of that kind even easier: (2.3 fractionPart * 10) truncated. => "2" (instead of 3) In Primitive 51 (primitiveTruncated for Float>>truncated) I read frac = modf(rcvr, &trunc); so the problem looks like an issue with rounding errors in Math-Library's modf function. Indeed, I can reproduce the odd result of "(2.3 fractionPart * 10) truncated." in C++ using modf: // g++ -lm truncate.cpp && ./a.out #include<iostream> #include<cmath> using namespace std; int main(){ double f1, f2, f3; modf(10 * 0.3, &f1); cout << f1 << endl; modf(10 * modf(2.3, &f2), &f3); cout << f3 << endl; } // output: // 3 (ok) // 2 (error - should be 3) Question: what can be done about this? As a matter of fact, several important methods spread over a number of classes (Float, Number, Morph ... being among them) are senders of Float>>truncated or Float>>fractionPart, so rounding errors in primitive 51 or 52 could provoke unexpected behaviour in surprising places. -- View this message in context: http://forum.world.st/rounding-errors-tp3327130p3327130.html Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com.

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left scrollbars
by t olschewski March 1, 2011

March 1, 2011

Hi, what is the default way of getting left scrollbars - is there a setting? Obviously I can modify ScrollPane>>initialize to set scrollBarOnLeft := true, but maybe there is a better way. When I am pulling a scrollbar, I am always looking at the line starts not ends for judging how far I've got to scroll, so left scrollbars are more usable to me. -- View this message in context: http://forum.world.st/left-scrollbars-tp3329476p3329476.html Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com.

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