October 2012 - Pharo-users - lists.pharo.org

Re: [Pharo-users] subscribe on system change

by Goubier Thierry

Le 15/10/2012 08:10, Daniel Galdames a Ã©crit : > That depends on what version of Pharo you use. > In Pharo 1.4 you can use SystemChangeNotifier to do something like this: > > SystemChangeNotifier uniqueInstance > notify: toSomeObject > ofSystemChangesOfItem: #class > change: #Added > using: #someMethod:. > > then if a new class is added to the system, SystemChangeNotifier will > call #someMethod: on toSomeObject, passing an Event to #someMethod:. You > can browse the code on SystemChangeNotifier to see all the notification > you can use, and the package "System-Change Notification" to see the > events you can receive. > > In Pharo 2.0 you can do the same thing using SystemAnnouncer: > > SystemAnnouncer uniqueInstance > on: ClassAdded > send: #someMethod: > to: toSomeObject. > > You can see the different announcements you can use on browsing the > package "System-announcements". In this example #someMethod: will > receive an announcement. In Pharo 2.0, it could be interesting to use the weak variant of the subscription. SystemAnnouncer uniqueInstance weak on: ClassAdded send: #someMethod: to: toSomeObject. To create a weak link to it. A convenient method when you develop those things is: SystemAnnouncer uniqueInstance unsubscribe: toSomeObject. Because you usually spend time refactoring the #someMethod: above, and it helps knowing how to remove existing triggers. And a nice tool is to look at the announcements as they are produced, with SystemAnnouncer uniqueInstance open These are the tools I found usefull when tracing the system notifications. What I missed? A browser able to show who is subscribing to what. Thierry > -- > Daniel Galdames > > El domingo, 14 de octubre de 2012 a las 20:14, Miguel Enrique Campusano > Araya escribiÃ³: > >> I want to do some logic when there is a change on the system, like >> when a new class is loaded or when a method change. I don't want to >> put this logic explicit on the methods of the system who do that. I >> would like to know if i could subscribe to those special events >> (method change, new method, changes on a class and so on) so I can do >> what I want outside those methods. >> I heard about the Announcements but I don't know if Announcements >> could help with this problem. >> >> Can anyone give me some highlights to do those things? >> >> Thanks! >> (I'm really trying with my english, hope it's understandable) >> >> >> -- >> Miguel Enrique Campusano Araya >> Estudiante de IngenierÃa Civil en ComputaciÃ³n >> Universidad de Chile >> > -- Thierry Goubier CEA list Laboratoire des Fondations des SystÃ¨mes Temps RÃ©el EmbarquÃ©s 91191 Gif sur Yvette Cedex France Phone/Fax: +33 (0) 1 69 08 32 92 / 83 95

Oct. 16, 2012

Re: [Pharo-users] subscribe on system change

by Miguel Campusano

Thanks Daniel! and by the way, I'm using Pharo 2.0 -- View this message in context: http://forum.world.st/subscribe-on-system-change-tp4651205p4651326.html Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com.

Oct. 15, 2012

Re: [Pharo-users] about Metacello package loading order

by Robert Shiplett

and thanks very much for posting your update - and with the summary on that directive I believe that many experienced people see config and build/strip and 'base image' issues as the real challenges to Smalltalk in industrial settings ( the success stories may fail to reveal the pain that was endured - the usual caveat) ( even if back in the day the IT pundits carried on about memory footprint, bytecode and VM, not 'C' compiler, so why not LISP yada-yada ) Native widgets, 3D and all the jQuirky web-tricks pale when a mission critical app gets attention from top brass in a corporation because of a bad build or a config snaffu that "would never happen" if we used { here read Erlang, Gnu D or whatever ) What is not seen is the utter madness of trying to get an Eclipse config that is correct (useable code can be committed to a repo from that workspace) when arriving on any large team Java project running on Eclipse in a corporate setting where there is new work, custom work and maintenance. Not that getting started with an appropriate build does not take more than 5 business days often enough .... ( a scandal, yes, but it just keeps repeating - as any gray-haired St contractor can tell you ... ) The 'C' and 'C++' myth as you surely know is called "configure-make" ... If anything like this had been required to land 747's at Hong Kong Kai-tak a lot of people would have been crossing the Pacific in ships and clipper ships ;-) ... and forget about that cardiac bypass surgery at Cleveland Clinic. ( see redundancy and reliability in gauges vs CRM in the cockpit - and some tower controllers in the past who would be advising you that your gear were, in fact, down ;-) Thankfully, the typical Chevy or Toyoto mechanic does not have to do a build to get your car back to you with new or adjusted brakes ;-) ( yes, ABS - and the Smalltalk analog being ... ) Someone should tell the Adobe FLASH team ... NOT. I would go on, but I have to update my Adobe Reader ... thanks again Sent with neither Adobe AIR not Microsoft SilverLight on the box - and after only one re-boot fo a DLL update ;-) " Now let's reset JAVA_HOME to point at 1.4.4299 so that I can get this Ruby Gem to install ! " R no PCRE used to spell check the above rant no devotee to Scala or Clojure should reply with a flame on this list : if you think you are here, you are actually lost in a Feedax Cessna Caravan at dusk in a UT box canyon at low altitude and high airspeed with BINGO fuel and a Ctr of Lift a bit too near or sliding behind your C of G and now he asks "Was it you who tied down the freight or was it me ?"

Oct. 15, 2012

Re: [Pharo-users] about Metacello package loading order

by Usman Bhatti

The problem was resolved. Thanks to Stef and Marianno for their effort to look at the code. The package was actually loaded in two configurations and I was not calling requires: in all locations (duplicate code is bad even in configuration ;-). So, a bit of cleanup resolved the problem. Good thing is that now I know about this directive that helps debugging package loading. ((ConfigurationOfMantisDemo loadDev) record) loadDirective. usman On Sun, Oct 14, 2012 at 10:04 PM, Mariano Martinez Peck < marianopeck(a)gmail.com> wrote: > > > On Sun, Oct 14, 2012 at 8:25 PM, Usman Bhatti <usman.bhatti(a)gmail.com>wrote: > >> I have a configuration as follows : >> >> spec for: #common do: [ >> "a class in package BBB inherits from a class in package AAA" >> spec >> package: 'AAA'; >> package: 'BBB' with: [spec requires: 'AAA'] >> ]. >> >> > As Stef said, it should work. I don't see anything weird. > Try to PRINT (as Stef said) the result of doing a #record instead of a > #load and see what is being load and in which order. > > >> Now, when I try to load this configuration, it fails to properly load the >> package BBB (there are some missing classes) with this msg: >> >> *This package depends on the following classes:* >> >> * A class in package AAA* >> >> *You must resolve these dependencies before you will be able to load >> these definitions: A class in package BBB.* >> >> It seems that there is a way to load packages in a linear order ( >> http://code.google.com/p/metacello/wiki/FAQ#Controlling_Package_Initializat…) >> However, my project defaults is already set to linear and after reading >> this post my problem is not resolved. >> >> Can anyone help me how I can enforce package AAA to load before BBB? >> >> tx, >> >> usman >> > > > > -- > Mariano > http://marianopeck.wordpress.com > >

Oct. 15, 2012

Re: [Pharo-users] subscribe on system change

by Daniel Galdames

That depends on what version of Pharo you use. In Pharo 1.4 you can use SystemChangeNotifier to do something like this: SystemChangeNotifier uniqueInstance notify: toSomeObject ofSystemChangesOfItem: #class change: #Added using: #someMethod:. then if a new class is added to the system, SystemChangeNotifier will call #someMethod: on toSomeObject, passing an Event to #someMethod:. You can browse the code on SystemChangeNotifier to see all the notification you can use, and the package "System-Change Notification" to see the events you can receive. In Pharo 2.0 you can do the same thing using SystemAnnouncer: SystemAnnouncer uniqueInstance on: ClassAdded send: #someMethod: to: toSomeObject. You can see the different announcements you can use on browsing the package "System-announcements". In this example #someMethod: will receive an announcement. -- Daniel Galdames El domingo, 14 de octubre de 2012 a las 20:14, Miguel Enrique Campusano Araya escribiÃ³: > I want to do some logic when there is a change on the system, like when a new class is loaded or when a method change. I don't want to put this logic explicit on the methods of the system who do that. I would like to know if i could subscribe to those special events (method change, new method, changes on a class and so on) so I can do what I want outside those methods. > I heard about the Announcements but I don't know if Announcements could help with this problem. > > Can anyone give me some highlights to do those things? > > Thanks! > (I'm really trying with my english, hope it's understandable) > > > -- > Miguel Enrique Campusano Araya > Estudiante de IngenierÃa Civil en ComputaciÃ³n > Universidad de Chile >

Oct. 15, 2012

subscribe on system change

by Miguel Enrique Campusano Araya

I want to do some logic when there is a change on the system, like when a new class is loaded or when a method change. I don't want to put this logic explicit on the methods of the system who do that. I would like to know if i could subscribe to those special events (method change, new method, changes on a class and so on) so I can do what I want outside those methods. I heard about the Announcements but I don't know if Announcements could help with this problem. Can anyone give me some highlights to do those things? Thanks! (I'm really trying with my english, hope it's understandable) -- Miguel Enrique Campusano Araya Estudiante de IngenierÃa Civil en ComputaciÃ³n Universidad de Chile

Oct. 14, 2012

Re: [Pharo-users] about Metacello package loading order

by Mariano Martinez Peck

On Sun, Oct 14, 2012 at 8:25 PM, Usman Bhatti <usman.bhatti(a)gmail.com>wrote: > I have a configuration as follows : > > spec for: #common do: [ > "a class in package BBB inherits from a class in package AAA" > spec > package: 'AAA'; > package: 'BBB' with: [spec requires: 'AAA'] > ]. > > As Stef said, it should work. I don't see anything weird. Try to PRINT (as Stef said) the result of doing a #record instead of a #load and see what is being load and in which order. > Now, when I try to load this configuration, it fails to properly load the > package BBB (there are some missing classes) with this msg: > > *This package depends on the following classes:* > > * A class in package AAA* > > *You must resolve these dependencies before you will be able to load > these definitions: A class in package BBB.* > > It seems that there is a way to load packages in a linear order ( > http://code.google.com/p/metacello/wiki/FAQ#Controlling_Package_Initializat…) > However, my project defaults is already set to linear and after reading > this post my problem is not resolved. > > Can anyone help me how I can enforce package AAA to load before BBB? > > tx, > > usman > -- Mariano http://marianopeck.wordpress.com

Oct. 14, 2012

Re: [Pharo-users] about Metacello package loading order

by StÃ©phane Ducasse

usman can you provide to me the link (privately if you need). Stef On Oct 14, 2012, at 8:25 PM, Usman Bhatti wrote: > I have a configuration as follows : > > spec for: #common do: [ > "a class in package BBB inherits from a class in package AAA" > spec > package: 'AAA'; > package: 'BBB' with: [spec requires: 'AAA'] > ]. > Now, when I try to load this configuration, it fails to properly load the package BBB (there are some missing classes) with this msg: > > This package depends on the following classes: > > A class in package AAA > > You must resolve these dependencies before you will be able to load these definitions: A class in package BBB. > > It seems that there is a way to load packages in a linear order (http://code.google.com/p/metacello/wiki/FAQ#Controlling_Package_Initializat…) However, my project defaults is already set to linear and after reading this post my problem is not resolved. > > Can anyone help me how I can enforce package AAA to load before BBB? > > tx, > > usman >

Oct. 14, 2012

Re: [Pharo-users] about Metacello package loading order

by Igor Stasenko

On 14 October 2012 20:25, Usman Bhatti <usman.bhatti(a)gmail.com> wrote: > I have a configuration as follows : > > spec for: #common do: [ > "a class in package BBB inherits from a class in package AAA" > spec > package: 'AAA'; > package: 'BBB' with: [spec requires: 'AAA'] > ]. > > Now, when I try to load this configuration, it fails to properly load the > package BBB (there are some missing classes) with this msg: > > This package depends on the following classes: > > A class in package AAA > > You must resolve these dependencies before you will be able to load these > definitions: A class in package BBB. > > It seems that there is a way to load packages in a linear order > (http://code.google.com/p/metacello/wiki/FAQ#Controlling_Package_Initializat…) > However, my project defaults is already set to linear and after reading this > post my problem is not resolved. > > Can anyone help me how I can enforce package AAA to load before BBB? > That should not happen. Unless you doing something wrong. It looks like a bug in metacello. > tx, > > usman -- Best regards, Igor Stasenko.

Oct. 14, 2012

Re: [Pharo-users] about Metacello package loading order

by StÃ©phane Ducasse

it should work. I have many examples of such a situation and it works. Did you try to get (chef the metacello chapter) the list of packages that we will be loaded. ((ConfigurationOfCoolBrowser project version: '0.2') record: { 'CoolBrowser-Core' . 'CoolBrowser-Addons' }) loadDirective Stef On Oct 14, 2012, at 8:25 PM, Usman Bhatti wrote: > I have a configuration as follows : > > spec for: #common do: [ > "a class in package BBB inherits from a class in package AAA" > spec > package: 'AAA'; > package: 'BBB' with: [spec requires: 'AAA'] > ]. > Now, when I try to load this configuration, it fails to properly load the package BBB (there are some missing classes) with this msg: > > This package depends on the following classes: > > A class in package AAA > > You must resolve these dependencies before you will be able to load these definitions: A class in package BBB. > > It seems that there is a way to load packages in a linear order (http://code.google.com/p/metacello/wiki/FAQ#Controlling_Package_Initializat…) However, my project defaults is already set to linear and after reading this post my problem is not resolved. > > Can anyone help me how I can enforce package AAA to load before BBB? > > tx, > > usman >

Oct. 14, 2012