March 2021 - Pharo-users - lists.pharo.org

Re: Code not showing all items in directory

by David＠totallyobjects.com

March 7, 2021

Re: Code not showing all items in directory

by StÃ©phane Ducasse

You can put a conditional halt in the loading logic Halt if: [ name = âjoâ] and let us know. Did you check the rights of these files? Are they symbolic links? Because FileSystem has sometimes surprising behavior with symbolic links. S. > On 7 Mar 2021, at 21:35, David Pennington <david(a)totallyobjects.com <mailto:david@totallyobjects.com>> wrote: > > Not sure what you mean by ls. Here is the directory. The file called jo is not appearing in the list. > > <member dir.png> > > > > >> On 7 Mar 2021, at 20:01, StÃ©phane Ducasse <stephane.ducasse(a)inria.fr <mailto:stephane.ducasse@inria.fr>> wrote: >> >> can you show us your file names? >> >> and a ls of your directory? >> >>> On 7 Mar 2021, at 20:58, David Pennington <david(a)totallyobjects.com <mailto:david@totallyobjects.com>> wrote: >>> >>> Hi there. I am a long time user of VAST recently moved to Pharo. I have a directory that contains 20 JSON items. I am using the following code to load all of them into a collection. >>> >>> bucketList >>> >>> >>> | top fileDirectory bucketList nameList | >>> top := FileSystem disk workingDirectory. >>> fileDirectory := top / 'TinyKVDB' / self bucket. >>> bucketList := fileDirectory children. >>> nameList := SortedCollection new. >>> bucketList >>> do: [ :each | >>> nameList add: each asString ] . >>> ^ nameList >>> >>> The code is only loading 18 of the items in the directory. I cannot see that there is anything different between there 18 and the other 2. Can anyone give me some clues here? >>> >>> David >>> TotallyObjects >> >> -------------------------------------------- >> StÃ©phane Ducasse >> http://stephane.ducasse.free.fr <http://stephane.ducasse.free.fr/> / http://www.pharo.org <http://www.pharo.org/> >> 03 59 35 87 52 >> Assistant: Aurore Dalle >> FAX 03 59 57 78 50 >> TEL 03 59 35 86 16 >> S. Ducasse - Inria >> 40, avenue Halley, >> Parc Scientifique de la Haute Borne, BÃ¢t.A, Park Plaza >> Villeneuve d'Ascq 59650 >> France >> > -------------------------------------------- StÃ©phane Ducasse http://stephane.ducasse.free.fr / http://www.pharo.org 03 59 35 87 52 Assistant: Aurore Dalle FAX 03 59 57 78 50 TEL 03 59 35 86 16 S. Ducasse - Inria 40, avenue Halley, Parc Scientifique de la Haute Borne, BÃ¢t.A, Park Plaza Villeneuve d'Ascq 59650 France

March 7, 2021

Re: Code not showing all items in directory

by David＠totallyobjects.com

March 7, 2021

Re: Code not showing all items in directory

by David Pennington

Not sure what you mean by ls. Here is the directory. The file called jo is not appearing in the list. > On 7 Mar 2021, at 20:01, StÃ©phane Ducasse <stephane.ducasse(a)inria.fr> wrote: > > can you show us your file names? > > and a ls of your directory? > >> On 7 Mar 2021, at 20:58, David Pennington <david(a)totallyobjects.com <mailto:david@totallyobjects.com>> wrote: >> >> Hi there. I am a long time user of VAST recently moved to Pharo. I have a directory that contains 20 JSON items. I am using the following code to load all of them into a collection. >> >> bucketList >> >> >> | top fileDirectory bucketList nameList | >> top := FileSystem disk workingDirectory. >> fileDirectory := top / 'TinyKVDB' / self bucket. >> bucketList := fileDirectory children. >> nameList := SortedCollection new. >> bucketList >> do: [ :each | >> nameList add: each asString ] . >> ^ nameList >> >> The code is only loading 18 of the items in the directory. I cannot see that there is anything different between there 18 and the other 2. Can anyone give me some clues here? >> >> David >> TotallyObjects > > -------------------------------------------- > StÃ©phane Ducasse > http://stephane.ducasse.free.fr <http://stephane.ducasse.free.fr/> / http://www.pharo.org <http://www.pharo.org/> > 03 59 35 87 52 > Assistant: Aurore Dalle > FAX 03 59 57 78 50 > TEL 03 59 35 86 16 > S. Ducasse - Inria > 40, avenue Halley, > Parc Scientifique de la Haute Borne, BÃ¢t.A, Park Plaza > Villeneuve d'Ascq 59650 > France >

March 7, 2021

Re: Code not showing all items in directory

by StÃ©phane Ducasse

can you show us your file names? and a ls of your directory? > On 7 Mar 2021, at 20:58, David Pennington <david(a)totallyobjects.com> wrote: > > Hi there. I am a long time user of VAST recently moved to Pharo. I have a directory that contains 20 JSON items. I am using the following code to load all of them into a collection. > > bucketList > > > | top fileDirectory bucketList nameList | > top := FileSystem disk workingDirectory. > fileDirectory := top / 'TinyKVDB' / self bucket. > bucketList := fileDirectory children. > nameList := SortedCollection new. > bucketList > do: [ :each | > nameList add: each asString ] . > ^ nameList > > The code is only loading 18 of the items in the directory. I cannot see that there is anything different between there 18 and the other 2. Can anyone give me some clues here? > > David > TotallyObjects -------------------------------------------- StÃ©phane Ducasse http://stephane.ducasse.free.fr / http://www.pharo.org 03 59 35 87 52 Assistant: Aurore Dalle FAX 03 59 57 78 50 TEL 03 59 35 86 16 S. Ducasse - Inria 40, avenue Halley, Parc Scientifique de la Haute Borne, BÃ¢t.A, Park Plaza Villeneuve d'Ascq 59650 France

March 7, 2021

Code not showing all items in directory

by David Pennington

Hi there. I am a long time user of VAST recently moved to Pharo. I have a directory that contains 20 JSON items. I am using the following code to load all of them into a collection. bucketList | top fileDirectory bucketList nameList | top := FileSystem disk workingDirectory. fileDirectory := top / 'TinyKVDB' / self bucket. bucketList := fileDirectory children. nameList := SortedCollection new. bucketList do: [ :each | nameList add: each asString ] . ^ nameList The code is only loading 18 of the items in the directory. I cannot see that there is anything different between there 18 and the other 2. Can anyone give me some clues here? David TotallyObjects

March 7, 2021

Re: change process variable while process is running

by Richard O'Keefe

Why do the parameters for the sequencer have to be *process* variables? Why can't they be instance variables of an object? SequenceControl (mutex v1 v2 ...) initialize mutex := Mutex new. v1 := default for v1. v2 := default for v2. ... v1 ^v1 v1: x validate x all by itself mutex critical: [ validate x in context of other variables v1 := x]. This takes care of all the memory fiddling necessary. Once again, the existence of this object would be a shared secret between the process and the creating process. On Wed, 3 Mar 2021 at 00:48, <mspgate(a)gmail.com> wrote: > thanks Sven and thanks Richard. > > I already thought it was not a good idea to change a variable inside the > process as for OOP principles. > > but I dint find any solution to do what I want to do, that is a tool for > live coding in which the process variables are values for a sequencer > sendin OSC messages to another application. I need the process for the > timing. > > what I had in mind came from the fact that in c++ frameworks to build > audio application you can modify variable values inside a thread. > > after your answers I think I will have to look for another approach. >

March 3, 2021

Re: change process variable while process is running

by mspgate＠gmail.com

thanks Sven and thanks Richard. I already thought it was not a good idea to change a variable inside the process as for OOP principles. but I dint find any solution to do what I want to do, that is a tool for live coding in which the process variables are values for a sequencer sendin OSC messages to another application. I need the process for the timing. what I had in mind came from the fact that in c++ frameworks to build audio application you can modify variable values inside a thread. after your answers I think I will have to look for another approach.

March 2, 2021

Re: change process variable while process is running

by Richard O'Keefe

How do you modify a variable in another process? DON'T. Yes, it is possible. No, it's an amazingly bad idea in any programming language. First, let us see a simple, obvious, and portable way to do what you want. (It has one minor problem which I'll get to.) shared := Array new: 1. shared at: 1 put: initialValue. [ 1 to: 100 do: [:i | Transcript show: (shared at: 1); cr ] fork. The 'shared' object is a secret shared between the new Process and the (method in the) Process that created it. Nothing else can see it, let alone change it. This is a good thing. The minor problem I mentioned? It might not work. If the two Processes are running on different cores, and if the compiler is (too) smart (enough), memory writes from one Process might not be noticed by memory reads at the other. You should think about processes the way you think about objects. "How do I change a variable in another object? DON'T!" "How do I change a variable in another process? DON'T!" What variables another object has or another process has are PRIVATE IMPLEMENTATION DETAILS. The Object-Oriented rule is ASK, DON'T TELL. That is, you should never *force* an object or process to do anything, you should ASK it to do something by sending a message. The way you send a message to a Process is via a SharedQueue. shared := SharedQueue new. [ |text next| text := 'Kalimera Kosmou'. 1 to: 100 do: [:i | next := shared nextOrNil. next ifNotNil: [text := next]. Transcript show: text; cr] ] fork. shared nextPut: 'Pozdrav svijete'. shared nextPut: 'Hello world'. With this approach, the receiving process has complete and absolute control over when the variable ('text') is changed and indeed whether it is changed. There are several other tools you can use, but my experience has been that getting things right using Processes and SharedQueues FIRST before trying other kinds of things (like rolling your own Mailbox or Rendezvous classes) makes concurrent programming so much easier. It also drives home that the originating process does not know when or whether the receiving process has acted on the message, but that's the case with shared variables too, modern hardware and operating systems being what they are. It's just more OBVIOUS this way and more CONTROLLED. On Tue, 2 Mar 2021 at 22:42, <mspgate(a)gmail.com> wrote: > Hello everybody, I am kind of new to Pharo so I apologise if my > question is silly :) > how can a change a variable in a process while the process is running? > for example in: > [[ | msg| msg := 'help me'. 100 timesRepeat: [(Delay forSeconds: 0.5) > wait. Transcript show: msg; cr]] fork. > > how do I change the value of msg while the process is running in order > to modify what the Transcript is showing? > is that possible? > thanks. > Domenico >

March 2, 2021

Re: change process variable while process is running

by Sven Van Caekenberghe

Hi, You might learn something from the class/hierarchy ProcessSpecificVariable, esp. the methods in the category 'process specific' in the Process class, e.g. #psValueAt:[put:] Sven > On 2 Mar 2021, at 10:42, mspgate(a)gmail.com wrote: > > Hello everybody, I am kind of new to Pharo so I apologise if my > question is silly :) > how can a change a variable in a process while the process is running? > for example in: > [[ | msg| msg := 'help me'. 100 timesRepeat: [(Delay forSeconds: 0.5) > wait. Transcript show: msg; cr]] fork. > > how do I change the value of msg while the process is running in order > to modify what the Transcript is showing? > is that possible? > thanks. > Domenico >

March 2, 2021