September 2011 - Pharo-users

Persistence of data across sessions

by graham telfer

Hi there, I completed the Bank Account tutorial written for Squeak. It worked fine but I have a question about persistence of data. After I built the bank account and gave it a balance history I saved and quit. Later I wanted to go back to it. The account and its details were gone and I could only create a new account. How is data saved across sessions in Pharo?

Sept. 3, 2011

[COTDC] 79 - RefactoryChange

by laurent laffont

A comment per day is known to expend your life expectancy. Today: RefactoryChange Comment Of The Day Contest - One Day One Comment Rules: #1: Each day a not commented class is elected. Each day the best comment will be integrated with name of the author(s). #2: If you cannot comment it, deprecate it. Results: http://code.google.com/p/pharo/wiki/CommentOfTheDayContest Laurent

Sept. 2, 2011

Fwd: Smalltalks 2011: Call for Submission/Participacion

by Mariano Martinez Peck

---------- Forwarded message ---------- From: gabriela arevalo <gabriela.arevalo(a)fast.org.ar> Date: Thu, Sep 1, 2011 at 10:36 PM Subject: Smalltalks 2011: Call for Submission/Participacion To: Sorry for multiple copies Following you have the Spanish version of the Smalltalks 2011 Call for Submission/Participation ======== ENGLISH The FundaciÃ³n Argentina de Smalltalk (FAST, http://www.fast.org.ar) invites you to the 5th Argentine Smalltalk Conference, to be held on November 3, 4 and 5, 2011 at the Quilmes University located in Buenos Aires. Everyone, including teachers, students, researchers, developers and entrepreneurs, are welcome as speakers or attendees. Registration is free and now open at http://www.fast.org.ar/smalltalks2011 The goal of the Conference is to strengthen the bonds between the Argentine and the international Smalltalk community through the exchange of works, experiences and anecdotes connected with this technology and related matters. As in the previous editions, renowned members of the international Smalltalk community will visit us, and like last year we will have a Research Session with publications reviewed by an international committee. Also, the traditional Industry Track will be available for those who prefer a more practical environment. You can submit papers or talks now through our website at http://www.fast.org.ar/smalltalks2011/technical-session Finally, a Pharo Sprint will be held prior to the conference for those willing to help the community coding, and two seminars will take place for those who want to get acquainted with or learn more about Smalltalk. For more information go to http://www.fast.org.ar/smalltalks2011/events For any questions please contact us at info(a)fast.org.ar. See you there! ==== SPANISH La FundaciÃ³n Argentina de Smalltalk (FAST, http://www.fast.org.ar) los invita a la 5ta Conferencia de Smalltalk de Argentina, a realizarse desde el 3 al 5 de Noviembre del 2011 en la sede de la Universidad de Quilmes, Buenos Aires. Esperamos verlos a todos entre la audiencia o como oradores, ya sean profesores, estudiantes, investigadores, desarrolladores o empresarios. La registraciÃ³n es gratis y estÃ¡ disponible en http://www.fast.org.ar/smalltalks2011 El objetivo de la conferencia es afianzar los vÃnculos entre las comunidades Smalltalk de Argentina y del mundo y con todo desarrollador, educador o investigador que utilice el paradigma de Objetos. Esto lo lograremos a travÃ©s del intercambio de trabajos, experiencias y vivencias conectadas con esta tecnologÃa. Nuevamente en esta ediciÃ³n nos visitarÃ¡n personalidades de renombre de la comunidad internacional y contaremos con un track de investigaciÃ³n formal con publicaciones y referato de un comitÃ© internacional. Contaremos tambiÃ©n con el tradicional track de industria para aquellos que prefieran un ambiente mÃ¡s prÃ¡ctico. Pueden suscribir sus propuestas de charlas o papers mediante nuestra pÃ¡gina web en http://www.fast.org.ar/smalltalks2011/technical-session Por Ãºltimo, se realizarÃ¡ un Pharo Sprint para todos aquellos que tengan interÃ©s de aportar concretamente con cÃ³digo a la comunidad y se dictarÃ¡n dos seminarios para aquellos que quieran entender y conocer mÃ¡s Smalltalk. Para mÃ¡s informaciÃ³n ir a http://www.fast.org.ar/smalltalks2011/events Cualquier duda no dejen de consultarla enviando un mail a info(a)fast.org.ar Nos vemos en la conferencia! -- Mariano http://marianopeck.wordpress.com

Sept. 2, 2011

Re: [Pharo-users] Evented I/O ?

by Davorin Rusevljan

On Thu, Sep 1, 2011 at 9:56 AM, StÃ©phane Ducasse <stephane.ducasse(a)inria.fr> wrote: > I would really that somebody run an experience on wrapping some good unix async library. I am working on the AMQP 1.0 client library (AMQP is a message queue specification), and using async io, and providing event based api for the AMQP library (using reactor pattern like in ruby's Event Machine) would be great. I might try to implement small event machine, and use it to both wrap AioPlugin, and to wrap interface to AMQP.. But I'll make no big proomises.:) Davorin Rusevljan http://www.cloud208.com/

Sept. 2, 2011

Re: [Pharo-users] Evented I/O ?

by Davorin Rusevljan

On Thu, Sep 1, 2011 at 2:16 PM, David T. Lewis <lewis(a)mail.msen.com> wrote: > It will work on OS X also, but the plugin is not usually distributed > on those VMs. There is no implementation for Windows. just a dummy question, does plugin also work under the Cog VM? davorin

Sept. 2, 2011

Re: [Pharo-users] [COTDC] 78 - RBSubclassResponsibilityNotDefinedRule

by StÃ©phane Ducasse

On Sep 1, 2011, at 8:52 PM, laurent laffont wrote: > You want a cool, better and fun system ? You want to be proud ? You want glory ? Nice ladies and caring men ? You want to stop drinking sugar water for the rest of your life and come with us and change the world ? > > Yes, we can !!! > > > Just participate to the COMMENT OF THE DAY CONTEST and win the respect of all Pharoers around the world ! Free participation, big reward ! > > > Today: RBSubclassResponsibilityNotDefinedRule This rules identifies when several methods in a set of subclasses are defined but not in the superclass. It identifies that an abstract method is missing in the superclass. > > > > Comment Of The Day Contest - One Day One Comment > Rules: > #1: Each day a not commented class is elected. Each day the best comment will be integrated with name of the author(s). > #2: If you cannot comment it, deprecate it. > Results: http://code.google.com/p/pharo/wiki/CommentOfTheDayContest > > Laurent

Sept. 1, 2011

[COTDC] 78 - RBSubclassResponsibilityNotDefinedRule

by laurent laffont

You want a cool, better and fun system ? You want to be proud ? You want glory ? Nice ladies and caring men ? You want to stop drinking sugar water for the rest of your life and come with us and change the world ? Yes, we can !!! Just participate to the COMMENT OF THE DAY CONTEST and win the respect of all Pharoers around the world ! Free participation, big reward ! Today: RBSubclassResponsibilityNotDefinedRule Comment Of The Day Contest - One Day One Comment Rules: #1: Each day a not commented class is elected. Each day the best comment will be integrated with name of the author(s). #2: If you cannot comment it, deprecate it. Results: http://code.google.com/p/pharo/wiki/CommentOfTheDayContest Laurent

Sept. 1, 2011

Re: [Pharo-users] Evented I/O ?

by David T. Lewis

On Thu, Sep 01, 2011 at 09:10:40AM +0200, Davorin Rusevljan wrote: > On Thu, Sep 1, 2011 at 2:16 AM, David T. Lewis <lewis(a)mail.msen.com> wrote: > > Are you talking about signaling the image when an IO event happens? > > If so, see http://wiki.squeak.org/squeak/3384. The plugin is included > > in standard unix VMs. > > > I did a quick peek, if not perfect, it might be of much help. > > On positive side: > - it allows for async work with files and sockers Files, sockets, pipes. Anything that looks like a file descriptor on unix. > > On might be improved side: > - it depends on select call which in it self is not perfect for large > number of file descriptors (like thousand(s)) Yes, the plugin provides a hook into the underlying aio mechanism in the VM. > - it seems to require Smalltalk process for each file desciptor, and > ProcessScheduler might also not be happy with thousands of smalltalk > processe Yes. If you want to put a load on the aio plugin, try running the CommandShell unit test suite with a standard unix interpreter VM. > - unix only. > Yes. It will work on OS X also, but the plugin is not usually distributed on those VMs. There is no implementation for Windows. > Anyway, even so: > - it will still probably be much better than synchronous way of doing things. > - it might be used to experiment, design and prototype nice callback > based API on the Smalltalk side. > > Thanks! > > Davorin Rusevljan > http://www.cloud208.com/

Sept. 1, 2011

Re: [Pharo-users] Evented I/O ?

by StÃ©phane Ducasse

I would really that somebody run an experience on wrapping some good unix async library. Stef > Are you talking about signaling the image when an IO event happens? >> If so, see http://wiki.squeak.org/squeak/3384. The plugin is included >> in standard unix VMs. > > > I did a quick peek, if not perfect, it might be of much help. > > On positive side: > - it allows for async work with files and sockers > > On might be improved side: > - it depends on select call which in it self is not perfect for large > number of file descriptors (like thousand(s)) > - it seems to require Smalltalk process for each file desciptor, and > ProcessScheduler might also not be happy with thousands of smalltalk > processe > - unix only. > > Anyway, even so: > - it will still probably be much better than synchronous way of doing things. > - it might be used to experiment, design and prototype nice callback > based API on the Smalltalk side. > > Thanks! > > Davorin Rusevljan > http://www.cloud208.com/ >

Sept. 1, 2011

Re: [Pharo-users] Evented I/O ?

by Davorin Rusevljan

On Thu, Sep 1, 2011 at 2:16 AM, David T. Lewis <lewis(a)mail.msen.com> wrote: > Are you talking about signaling the image when an IO event happens? > If so, see http://wiki.squeak.org/squeak/3384. The plugin is included > in standard unix VMs. I did a quick peek, if not perfect, it might be of much help. On positive side: - it allows for async work with files and sockers On might be improved side: - it depends on select call which in it self is not perfect for large number of file descriptors (like thousand(s)) - it seems to require Smalltalk process for each file desciptor, and ProcessScheduler might also not be happy with thousands of smalltalk processe - unix only. Anyway, even so: - it will still probably be much better than synchronous way of doing things. - it might be used to experiment, design and prototype nice callback based API on the Smalltalk side. Thanks! Davorin Rusevljan http://www.cloud208.com/

Sept. 1, 2011