April 2014 - Pharo-users - lists.pharo.org

Re: [Pharo-users] RDBMS Atomic Counter?

by Esteban Lorenzano

but Iâm with Sven here, you should use sequences (unless there is something that prevents you to do itâ¦ ?). Esteban On 17 Apr 2014, at 11:50, itlists(a)schrievkrom.de wrote: > I think this is simply a case of optimistic locking - there is a general > way and very often db specific ways > > first you get the current active value ... (one row) > > currentValue from "select counterfield from tablename" > > > then you update the table (single row) > > > update > tablename > set > counterfield = currentValue + 1 > where > counterfield = currentValue > > commit > > then you look how many rows have been changed (=1) and assume, that > commit was successful and then you know if you were successful ... > otherwise you must retry ... > > this is a simple, with worst performance but portale approach ... > > Marten > > > Am 16.04.2014 21:52, schrieb Esteban A. Maringolo: >> Hi, >> >> A few weeks ago Sven was asking for a lock-free in-image atomic counter. >> >> Today I'm in need of implementing a DB backed (PGSQL) counter for >> business forms numbering, and maybe there are some toughts you're >> willing to share :) >> >> I can't find any other way than a row lock for each counter, but maybe >> there is something better (I avoid locks as much as possible). >> >> Any thoughts to share here? >> >> Regards! >> > > > -- > Marten Feldtmann >

April 17, 2014

Re: [Pharo-users] RDBMS Atomic Counter?

by itlists＠schrievkrom.de

I think this is simply a case of optimistic locking - there is a general way and very often db specific ways first you get the current active value ... (one row) currentValue from "select counterfield from tablename" then you update the table (single row) update tablename set counterfield = currentValue + 1 where counterfield = currentValue commit then you look how many rows have been changed (=1) and assume, that commit was successful and then you know if you were successful ... otherwise you must retry ... this is a simple, with worst performance but portale approach ... Marten Am 16.04.2014 21:52, schrieb Esteban A. Maringolo: > Hi, > > A few weeks ago Sven was asking for a lock-free in-image atomic counter. > > Today I'm in need of implementing a DB backed (PGSQL) counter for > business forms numbering, and maybe there are some toughts you're > willing to share :) > > I can't find any other way than a row lock for each counter, but maybe > there is something better (I avoid locks as much as possible). > > Any thoughts to share here? > > Regards! > -- Marten Feldtmann

April 17, 2014

Re: [Pharo-users] [Pharo-business] [ANN] FontAwesome for Seaside

by Sven Van Caekenberghe

Thanks, Torsten, very useful, as ever ! And a nice demo ;-) Small question: is font awesome a strict superset of the icons already in twitter bootstrap or not ? Should I replace one with the other ? Sven On 17 Apr 2014, at 10:27, Torsten Bergmann <astares(a)gmx.de> wrote: > Hi, > > FontAwesome is (as you may know) an iconic font designed for the user with Twitter Bootstrap. > > I now created a "FontAwesome for Seaside" project - which is a small Seaside wrapper for the > FontAwesome project (using the latest version 4.0.3). > > This is intended as an addition to the already available "Bootstrap for Seaside" [2] project > that I wrote and both should allow you to give your Smalltalk based web application a nice > stylish look. > > The project is located on STHub, see [1] where you will also find the documentation. > > A live demo can be found on http://pharo.pharocloud.com/fontawesome. > > To try yourself load it from the Pharo config browser or read the docu to see what is required. > > Thx > T. > > [1] http://smalltalkhub.com/#!/~TorstenBergmann/FontAwesome > [2] http://smalltalkhub.com/#!/~TorstenBergmann/Bootstrap<fontawesome.png>_______________________________________________ > Pharo-business mailing list > Pharo-business(a)lists.pharo.org > http://lists.pharo.org/mailman/listinfo/pharo-business_lists.pharo.org

April 17, 2014

Re: [Pharo-users] how to duplicate document with Voyage

by olivier auverlot

simply ? Thanks ;-) 2014-04-17 10:42 GMT+02:00 Esteban Lorenzano <estebanlm(a)gmail.com>: > > On 17 Apr 2014, at 10:17, Norbert Hartl <norbert(a)hartl.name> wrote: > > > > > Am 17.04.2014 um 10:08 schrieb Olivier Auverlot < > olivier.auverlot(a)gmail.com>: > > > >> Hi, > >> > >> I'm using Voyage and I need to duplicate an existing document in a > Mongo database. I suppose that the id must be changed before saving. > >> > >> What is the best way to do that ? > >> > > If you need a shallow copy then you better just copy the object and > store it. Changing the id is asking for trouble I guess. That would > probably work if you implement #= on those objects but I think it is a hack. > > > > anObject copy save > > +1 > > > > > should do. > > > > Norbert > > > > > > >

April 17, 2014

Re: [Pharo-users] how to duplicate document with Voyage

by Esteban Lorenzano

On 17 Apr 2014, at 10:17, Norbert Hartl <norbert(a)hartl.name> wrote: > > Am 17.04.2014 um 10:08 schrieb Olivier Auverlot <olivier.auverlot(a)gmail.com>: > >> Hi, >> >> I'm using Voyage and I need to duplicate an existing document in a Mongo database. I suppose that the id must be changed before saving. >> >> What is the best way to do that ? >> > If you need a shallow copy then you better just copy the object and store it. Changing the id is asking for trouble I guess. That would probably work if you implement #= on those objects but I think it is a hack. > > anObject copy save +1 > > should do. > > Norbert > >

April 17, 2014

[ANN] FontAwesome for Seaside

by Torsten Bergmann

Hi, FontAwesome is (as you may know) an iconic font designed for the user with Twitter Bootstrap. I now created a "FontAwesome for Seaside" project - which is a small Seaside wrapper for the FontAwesome project (using the latest version 4.0.3). This is intended as an addition to the already available "Bootstrap for Seaside" [2] project that I wrote and both should allow you to give your Smalltalk based web application a nice stylish look. The project is located on STHub, see [1] where you will also find the documentation. A live demo can be found on http://pharo.pharocloud.com/fontawesome. To try yourself load it from the Pharo config browser or read the docu to see what is required. Thx T. [1] http://smalltalkhub.com/#!/~TorstenBergmann/FontAwesome [2] http://smalltalkhub.com/#!/~TorstenBergmann/Bootstrap

April 17, 2014

Re: [Pharo-users] how to duplicate document with Voyage

by Norbert Hartl

Am 17.04.2014 um 10:08 schrieb Olivier Auverlot <olivier.auverlot(a)gmail.com>: > Hi, > > I'm using Voyage and I need to duplicate an existing document in a Mongo database. I suppose that the id must be changed before saving. > > What is the best way to do that ? > If you need a shallow copy then you better just copy the object and store it. Changing the id is asking for trouble I guess. That would probably work if you implement #= on those objects but I think it is a hack. anObject copy save should do. Norbert

April 17, 2014

how to duplicate document with Voyage

by Olivier Auverlot

Hi, I'm using Voyage and I need to duplicate an existing document in a Mongo database. I suppose that the id must be changed before saving. What is the best way to do that ? Best regards Olivier ;-)

April 17, 2014

Re: [Pharo-users] We need *you* for the upcoming Pharo's website

by Esteban A. Maringolo

Sorry but I don't fully understand the request. You want screenshots of Pharo or about the things we build with Pharo? Esteban A. Maringolo 2014-04-16 6:16 GMT-03:00 Esteban Lorenzano <estebanlm(a)gmail.com>: > please do not answer all at once! (subtle irony) > anyway, I have to add that screencast has to be Pharo3 based. > > cheers, > Esteban > > On 15 Apr 2014, at 13:03, Damien Cassou <damien.cassou(a)gmail.com> wrote: > >> Hi everyone, >> >> we are working on a new website for Pharo! We need your help. If you >> have some time, please create and send us one of the following items: >> >> - An up-to-date screenshot of Pharo 3.0 that shows some cool features. >> It should be 800px wide ; >> - A screencast ; >> - A paragraph (around 40 words) that presents a nice topic about Pharo >> and a corresponding screenshot. >> >> We will select 1 large screenshot, 3 screencasts and 4 topic paragraphs. >> >> This could be a very nice way for you to contribute to Pharo! >> >> Best, >> >> -- >> Damien Cassou >> http://damiencassou.seasidehosting.st >> >> "Success is the ability to go from one failure to another without >> losing enthusiasm." >> Winston Churchill >> > >

April 17, 2014

Re: [Pharo-users] RDBMS Atomic Counter?

by Sven Van Caekenberghe

If you are thinking about an RDBMS like postgresql, why not just use sequences ? http://www.neilconway.org/docs/sequences/ Especially the INSERT ... RETURNING ... ; is useful. On 16 Apr 2014, at 21:52, Esteban A. Maringolo <emaringolo(a)gmail.com> wrote: > Hi, > > A few weeks ago Sven was asking for a lock-free in-image atomic counter. > > Today I'm in need of implementing a DB backed (PGSQL) counter for > business forms numbering, and maybe there are some toughts you're > willing to share :) > > I can't find any other way than a row lock for each counter, but maybe > there is something better (I avoid locks as much as possible). > > Any thoughts to share here? > > Regards! >

April 16, 2014