Squeak-dev May 2001

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143 participants
597 discussions

Re: get instance using the hash value?
by Richard A. O'Keefe 28 May '01

28 May '01

An object has a hash value (self hash). 1. How can I get hold of an object with its hash value? anInstance _ AClassCanCreateInstanceUsingHashValue hash: 2340 It is in the nature of hash codes that they are not unique. There could be many thousands of objects with that hash code. Hash codes are not pointers, they're just a hack to speed up table lookups. I haven't checked: does Squeak 3.x still use 12-bit hash codes? 2. If I can get hold of an instance, how can I destroy it? Unseemly hacking in the VM aside, you can't. Smalltalk objects can survive anything except the death of (their) universe and insufficient attention. If you stop looking at them, they pine away. What you _can_ do is hunt down variables holding references to an object and nil them out, whereupon the object will eventually pine away because no-one is interested any more. What is the application problem you are trying to solve by these means?

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Re: Community and Artifact Define One Another (Was: SqF purpose:supporting the Squeak community?)
by John Hinsley 28 May '01

28 May '01

Alan Kay wrote: > > "Sociologists talk about method, physicists talk about physics" -- Poincare > > A very adaptable quote .... > Yes. Physicists I talked to denied that Popper's "Scientific Method" had anything to do with what they did and were more inclined to a Feyerabendian view of the process. Except they had little time for Feyerabend because he seemed to be "attacking science" on the basis of what Popper said scientists did! Cheers John -- ****************************************************************************** Marx: "Why do Anarchists only drink herbal tea?" Proudhon: "Because all proper tea is theft." ******************************************************************************

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Re: Community and Artifact Define One Another (Was: SqF purpose: supporting the Squeak community?)
by John Hinsley 28 May '01

28 May '01

Bijan Parsia wrote: > But Feyerabend is wonderful to read. Yes. Really a breath of fresh air. > They recently released a collection > of "almost correspondence" twixt F and Lakatos. Worth getting. I'd love to have this. Do you have a reference? Cheers John -- ****************************************************************************** Marx: "Why do Anarchists only drink herbal tea?" Proudhon: "Because all proper tea is theft." ******************************************************************************

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Re: RE: get instance using the hash value?
by Bob Arning 28 May '01

28 May '01

On Mon, 28 May 2001 08:30:41 -0700 TECHIN.A.KANG(a)mail.sprint.com wrote: >Side Question: how do I track down the objects holding this SwikiShelf? PointerFinder on: SwikiShelf someInstance Cheers, Bob

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Re: Community and Artifact Define One Another (Was: SqF purpose: supporting the Squeak community?)
by Joseph Pelrine 28 May '01

28 May '01

At 17:35 28.05.2001 , Bijan Parsia wrote: >But Feyerabend is wonderful to read. They recently released a collection >of "almost correspondence" twixt F and Lakatos. Worth getting. Could you post a title, ISBN or something like that for this book? Thanks -- - Joseph Pelrine [ | ] Daedalos Consulting Email: jpelrine(a)acm.org Web: www.daedalos.com/~j_pelrine Smalltalk - scene and not herd!

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RE: get instance using the hash value?
by TECHIN.A.KANG＠mail.sprint.com 28 May '01

28 May '01

ComSwiki is the application. I shutdown the Comanche Server, exit squeak. Run squeak, do someting, exist squeak. And ... Somehow I notice this suitation: The Comanche server is NOT running. When I execute "SwikiShelf allInstances". I got an Instance of it. When I run Comanche to startup swiki, I get 2 SwikiShelf instance. When I shutdown the Comanche, the lastest SwikiShelf goes way, but not the first one,which is always there! Side Question: how do I track down the objects holding this SwikiShelf? Thanks, Techin Alex Kang -----Original Message----- From: ok [mailto:ok@atlas.otago.ac.nz] Sent: Sunday, May 27, 2001 10:29 PM To: squeak Cc: ok Subject: Re: get instance using the hash value? An object has a hash value (self hash). 1. How can I get hold of an object with its hash value? anInstance _ AClassCanCreateInstanceUsingHashValue hash: 2340 It is in the nature of hash codes that they are not unique. There could be many thousands of objects with that hash code. Hash codes are not pointers, they're just a hack to speed up table lookups. I haven't checked: does Squeak 3.x still use 12-bit hash codes? 2. If I can get hold of an instance, how can I destroy it? Unseemly hacking in the VM aside, you can't. Smalltalk objects can survive anything except the death of (their) universe and insufficient attention. If you stop looking at them, they pine away. What you _can_ do is hunt down variables holding references to an object and nil them out, whereupon the object will eventually pine away because no-one is interested any more. What is the application problem you are trying to solve by these means?

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Re: Community and Artifact Define One Another (Was: SqF purpose: supporting the Squeak community?)
by John Hinsley 28 May '01

28 May '01

Bijan Parsia wrote: > Lakatos is a good antidote to Popper. But Feyerabend is arguably a better one! Cheers John -- ****************************************************************************** Marx: "Why do Anarchists only drink herbal tea?" Proudhon: "Because all proper tea is theft." ******************************************************************************

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Best way to deal with OS events?
by Kevin Fisher 28 May '01

28 May '01

Hi Folks: A quick question about OS events and Squeak...I'm in the process of hacking up a PDA application for the iPaq running Squeak. I'm doing this on Linux for the iPaq as well. Anyway, I'm trying to figure out how best to impliment an alarm for a calendar similar to what the Palm does. I want to be able to set events for dates & times and have the iPaq wake up and make a 'beep' or something. The functionality for the alarm wakeup stuff is all OS-level, and is not quite there yet...however it probably will be in short order. So my question is, how best to read an OS event like this from Squeak? I'm thinking that OSProcess might be my best bet, but that would limit portability. I'm not sure exactly how the 'wakeup event' will appear... probably an APM related event, I imagine. Any ideas? (and for anyone interested, the latest release of Linux for the iPaq is quite nice...it includes 'ipkg', similar to Debian's dpkg which makes it trivial to strip the system down to it's bare bones for space. All that, and the power/suspend button finally works. :)

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[EXPERIMENTAL][GOODIE] HintingBrowser
by danielv＠netvision.net.il 28 May '01

28 May '01

>A funny idea is to color the browser based on the ' complexity' of the >method.... so if the method is very long, the panel get red.... >Bye, >Diego Gomez Deck As in like this? (BTW, this changset includes Bobs MethodSubstitute, and so should simply work, no prerequisites) from preamble: "Change Set: HintingBrowser Date: 28 May 2001 Author: Daniel Vainsencher Experimental!! Adds hints about the contents of methods in the Browser. A - accessor S - just return self C - just return some constant P - a primitive a number - regular code, higher number mean more complicated code. Complex methods also get their names colored red. This very alpha code, much hackery, not meant for inclusion in update stream... Having gotten this clear, this code can say various things - 1. We can get some information more easily than entering the method, especially when browsing code. The info found by this version is only the trivially available, we could do more. 2. Cute icons might be better than letters 3. A smarter PluggableList would be able to get lists of things other than texts, and display each appropriately - (not like in this code by a fixed mapping) maybe by asking the list items, maybe by being configured with the right morph Factory by the application"!

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Re: The license-free fonts, was: Re: Packaging Squeak for DebianGNU/Linux
by Henrik Gedenryd 28 May '01

28 May '01

Duane Maxwell wrote: > We played with the X11 bitmap fonts but were unimpressed by the quality of > the glyphs - they don't seem as polished. The outline fonts suffer from the > problem that they don't look very good at small sizes. In our application, > printing was considered rare, so precision matching with print was secondary > to legibility on screen - which made fonts like Helvetica inferior to, say, > Geneva. My thought was that if people really wanted the other encoding one could select a defult font out of the X11 set which is ok. It would have been a reasonable trade-off. But Accu appearently gives us that option too. The subpixelrendered outline fonts usually look _very_ good, even down to size 10. Regular antialliased ones look ok-ish, and several GUIs, like Aqua and Eazel/Nautilus (oops, they're gone) now use them widely, some even everywhere (Aqua). > I think general Squeak users have the same needs - and it also > explains the emergence of new fonts like Arial and Verdana in newer > browsers Another problem is that there are several versions of the bitmaps for Times and Helvetica. Some look very different on screen. > As to the encoding issue, in my limited experience, Squeak doesn't use the > extended characters very frequently, probably because the existing fonts are > either incomplete or inconsistent. I suspect a change of encding wouldn't > affect much. Judging from the replies (none) the encoding doesn't seem like a hot issue any longer. Henrik

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