September 2011 - Pharo-dev - lists.pharo.org

Re: [Pharo-project] "Missing Pharo feature: undo close workspace. #Smalltalk"

by Alexandre Bergel

Yeah, I was fed up with the message: are you sure you want to close it and lose the content? :-) If you want some new features regarding the history of workspace content, I can spend time on it. Alexandre Le 23 sept. 2011 Ã 08:27, Clara Allende <clari.allende(a)gmail.com> a Ã©crit : > Yay! Awesome :D > > On 23 September 2011 09:20, Sven Van Caekenberghe <sven(a)beta9.be> wrote: > > On 23 Sep 2011, at 14:13, Mariano Martinez Peck wrote: > > > Since I don't have twitter, I answe here. > > The feature is already there. If you have closed the workspace, then open a new one, press in the small arrow in the top corner, select "previous contents" and it should be there... > > > > cheers > > Very nice, never knew about thatâ¦ > > Sven > > > > -- > "Most good programmers do programming not because they expect to get paid or get adulation by the public, but because it is fun to program." > > Linus Torvalds > >

Sept. 23, 2011

Re: [Pharo-project] Two objects with same hash

by Igor Stasenko

On 23 September 2011 16:32, Denis Kudriashov <dionisiydk(a)gmail.com> wrote: > Yes, I know. > > I just use generated object id to create unique file to archive object. > I generate id by current date and time "yyyyMMddHHmmssSSS + object hash". > But It is my mistake. > Now I use "yyyyMMddHHmmssSSS + UUID" (I need date parameter too). > And I think id like "yyyyMMddHHmmssSSS + object address" is good too for my > purpose. > AFAIK, UUID generation algorithm already includes a current time inside. Which means that your addition of date/time actually superfluous. > > 2011/9/23 Mariano Martinez Peck <marianopeck(a)gmail.com> >> >> >> On Fri, Sep 23, 2011 at 3:22 PM, Denis Kudriashov <dionisiydk(a)gmail.com> >> wrote: >>> >>> I am sure I see It in some block bost. But dont remember >> >> Ok, but GC can move objects arround. If you stick to that value as #hash >> then you dictionaries will be screw...you would need a rehash. But you don't >> know when to trigger it ;) >> >> >>> >>> 2011/9/23 Mariano Martinez Peck <marianopeck(a)gmail.com> >>>> >>>> >>>> On Fri, Sep 23, 2011 at 3:02 PM, Denis Kudriashov <dionisiydk(a)gmail.com> >>>> wrote: >>>>> >>>>> Thank you for all your responses. I will use UUID. >>>>> >>>>> Another assumption: >>>>> I know there is a trick to get object memory address. >>>> >>>> which one? >>>> >>>>> >>>>> Can it be used for object identity? (inside memory of objects) >>>>> >>>>> >>>>> >>>>> 2011/9/23 Marcus Denker <marcus.denker(a)inria.fr> >>>>>> >>>>>> On Sep 23, 2011, at 1:08 PM, Denis Kudriashov wrote: >>>>>> >>>>>> > Hello, >>>>>> > >>>>>> > I use hash message to generate unique object id. (unique between >>>>>> > current memory objects). >>>>>> > And I catch situation when two objects has same hash value. Objects >>>>>> > has been created in loop almost at same time. >>>>>> > >>>>>> > So my question - is it really possible? >>>>>> >>>>>> Yes, easily, as there are only 12 bits for the hash, there are only >>>>>> 4096 different hash values. >>>>>> >>>>>> This means that a hash is *not* at all a UUID, and all hashing data >>>>>> structures need to be optimized >>>>>> for the case of hash collision, as it will happen a lot. >>>>>> >>>>>> Â Â Â Â Marcus >>>>>> >>>>>> >>>>>> -- >>>>>> Marcus Denker -- http://marcusdenker.de >>>>>> >>>>>> >>>>> >>>> >>>> >>>> >>>> -- >>>> Mariano >>>> http://marianopeck.wordpress.com >>>> >>> >> >> >> >> -- >> Mariano >> http://marianopeck.wordpress.com >> > > -- Best regards, Igor Stasenko.

Sept. 23, 2011

Re: [Pharo-project] Two objects with same hash

by Denis Kudriashov

Yes, I know. I just use generated object id to create unique file to archive object. I generate id by current date and time "yyyyMMddHHmmssSSS + object hash". But It is my mistake. Now I use "yyyyMMddHHmmssSSS + UUID" (I need date parameter too). And I think id like "yyyyMMddHHmmssSSS + object address" is good too for my purpose. 2011/9/23 Mariano Martinez Peck <marianopeck(a)gmail.com> > > > On Fri, Sep 23, 2011 at 3:22 PM, Denis Kudriashov <dionisiydk(a)gmail.com>wrote: > >> I am sure I see It in some block bost. But dont remember >> >> > Ok, but GC can move objects arround. If you stick to that value as #hash > then you dictionaries will be screw...you would need a rehash. But you don't > know when to trigger it ;) > > > >> >> 2011/9/23 Mariano Martinez Peck <marianopeck(a)gmail.com> >> >>> >>> >>> On Fri, Sep 23, 2011 at 3:02 PM, Denis Kudriashov <dionisiydk(a)gmail.com>wrote: >>> >>>> Thank you for all your responses. I will use UUID. >>>> >>>> Another assumption: >>>> I know there is a trick to get object memory address. >>>> >>> >>> which one? >>> >>> >>>> Can it be used for object identity? (inside memory of objects) >>>> >>>> >>>> >>>> * >>>> * >>>> 2011/9/23 Marcus Denker <marcus.denker(a)inria.fr> >>>> >>>>> >>>>> On Sep 23, 2011, at 1:08 PM, Denis Kudriashov wrote: >>>>> >>>>> > Hello, >>>>> > >>>>> > I use hash message to generate unique object id. (unique between >>>>> current memory objects). >>>>> > And I catch situation when two objects has same hash value. Objects >>>>> has been created in loop almost at same time. >>>>> > >>>>> > So my question - is it really possible? >>>>> >>>>> Yes, easily, as there are only 12 bits for the hash, there are only >>>>> 4096 different hash values. >>>>> >>>>> This means that a hash is *not* at all a UUID, and all hashing data >>>>> structures need to be optimized >>>>> for the case of hash collision, as it will happen a lot. >>>>> >>>>> Marcus >>>>> >>>>> >>>>> -- >>>>> Marcus Denker -- http://marcusdenker.de >>>>> >>>>> >>>>> >>>> >>> >>> >>> -- >>> Mariano >>> http://marianopeck.wordpress.com >>> >>> >> > > > -- > Mariano > http://marianopeck.wordpress.com > >

Sept. 23, 2011

Re: [Pharo-project] local metacello?

by Mariano Martinez Peck

On Thu, Sep 22, 2011 at 8:30 AM, HwaJong Oh <daliot.oh(a)gmail.com> wrote: > Hi, > > Squeaksource is down at this moment. While wating, I send this question. > > Can Metacello work locally and remotely to squeaksource or other 3rd > server? > Stack up some versions locally and later sync them with squeaksource? > Yes, you can. But you may need to use something like #repositoriesOverride. I am sure Dale can help you more than me. > > HwaJong Oh > > -- > View this message in context: > http://forum.world.st/local-metacello-tp3832544p3832544.html > Sent from the Pharo Smalltalk mailing list archive at Nabble.com. > > -- Mariano http://marianopeck.wordpress.com

Sept. 23, 2011

[Pharo-project] [update 1.4] #14163

by Marcus Denker

14163 ----- Issue 4739: Workspace>>isStylingActive http://code.google.com/p/pharo/issues/detail?id=4739 Issue 4852: Strange name of class SHStyleElement http://code.google.com/p/pharo/issues/detail?id=4852 -- Marcus Denker -- http://marcusdenker.de

Sept. 23, 2011

[Pharo-project] Re : Re : looking for boring morphs

by Alain Plantec

Also look at dialog examples (UITheme class side) Alain >________________________________ >DeÂ : Alain Plantec <alain.plantec(a)yahoo.com> >ÃÂ : "Pharo-project(a)lists.gforge.inria.fr" <Pharo-project(a)lists.gforge.inria.fr> >EnvoyÃ© le : Vendredi 23 Septembre 2011 15h20 >ObjetÂ : [Pharo-project] Re : looking for boring morphs > > >Hi Esteban, > >As an entry point, you have PluggableTextFieldMorph. >You can build one with >UITheme class >> newTextEntryIn: aThemedMorph for: aModel get: getSel set: setSel class: aClass getEnabled: enabledSel help: helpText > >see the 'class:' argument. As an example, if you pass Integer, then a specific converter is used so that you can only enter a valid integer. >AFAIK, so far we have converters for String and Number. > >To implement new converters (to and from Date as an example), dig into >PluggableTextFieldMorph>>convertTo: aClass >Â Â Â "Set the converter object class." > >Â Â Â self converter isNil >Â Â Â Â Â Â Â ifTrue: [self converter: (ObjectStringConverter forClass: aClass)] >Â Â Â Â Â Â Â ifFalse: [self converter objectClass: aClass] > >and indeed, it would be could to integrate new converters. > >See SetingDeclaration>>inputWidgetForString as an client example. > >Cheers >Alain > > > >

Sept. 23, 2011

Re: [Pharo-project] Two objects with same hash

by Mariano Martinez Peck

On Fri, Sep 23, 2011 at 3:22 PM, Denis Kudriashov <dionisiydk(a)gmail.com>wrote: > I am sure I see It in some block bost. But dont remember > > Ok, but GC can move objects arround. If you stick to that value as #hash then you dictionaries will be screw...you would need a rehash. But you don't know when to trigger it ;) > > 2011/9/23 Mariano Martinez Peck <marianopeck(a)gmail.com> > >> >> >> On Fri, Sep 23, 2011 at 3:02 PM, Denis Kudriashov <dionisiydk(a)gmail.com>wrote: >> >>> Thank you for all your responses. I will use UUID. >>> >>> Another assumption: >>> I know there is a trick to get object memory address. >>> >> >> which one? >> >> >>> Can it be used for object identity? (inside memory of objects) >>> >>> >>> >>> * >>> * >>> 2011/9/23 Marcus Denker <marcus.denker(a)inria.fr> >>> >>>> >>>> On Sep 23, 2011, at 1:08 PM, Denis Kudriashov wrote: >>>> >>>> > Hello, >>>> > >>>> > I use hash message to generate unique object id. (unique between >>>> current memory objects). >>>> > And I catch situation when two objects has same hash value. Objects >>>> has been created in loop almost at same time. >>>> > >>>> > So my question - is it really possible? >>>> >>>> Yes, easily, as there are only 12 bits for the hash, there are only 4096 >>>> different hash values. >>>> >>>> This means that a hash is *not* at all a UUID, and all hashing data >>>> structures need to be optimized >>>> for the case of hash collision, as it will happen a lot. >>>> >>>> Marcus >>>> >>>> >>>> -- >>>> Marcus Denker -- http://marcusdenker.de >>>> >>>> >>>> >>> >> >> >> -- >> Mariano >> http://marianopeck.wordpress.com >> >> > -- Mariano http://marianopeck.wordpress.com

Sept. 23, 2011

Re: [Pharo-project] Two objects with same hash

by Denis Kudriashov

Maybe It is some example of NativeBoost 2011/9/23 Denis Kudriashov <dionisiydk(a)gmail.com> > I am sure I see It in some block bost. But dont remember > > > 2011/9/23 Mariano Martinez Peck <marianopeck(a)gmail.com> > >> >> >> On Fri, Sep 23, 2011 at 3:02 PM, Denis Kudriashov <dionisiydk(a)gmail.com>wrote: >> >>> Thank you for all your responses. I will use UUID. >>> >>> Another assumption: >>> I know there is a trick to get object memory address. >>> >> >> which one? >> >> >>> Can it be used for object identity? (inside memory of objects) >>> >>> >>> >>> * >>> * >>> 2011/9/23 Marcus Denker <marcus.denker(a)inria.fr> >>> >>>> >>>> On Sep 23, 2011, at 1:08 PM, Denis Kudriashov wrote: >>>> >>>> > Hello, >>>> > >>>> > I use hash message to generate unique object id. (unique between >>>> current memory objects). >>>> > And I catch situation when two objects has same hash value. Objects >>>> has been created in loop almost at same time. >>>> > >>>> > So my question - is it really possible? >>>> >>>> Yes, easily, as there are only 12 bits for the hash, there are only 4096 >>>> different hash values. >>>> >>>> This means that a hash is *not* at all a UUID, and all hashing data >>>> structures need to be optimized >>>> for the case of hash collision, as it will happen a lot. >>>> >>>> Marcus >>>> >>>> >>>> -- >>>> Marcus Denker -- http://marcusdenker.de >>>> >>>> >>>> >>> >> >> >> -- >> Mariano >> http://marianopeck.wordpress.com >> >> >

Sept. 23, 2011

Re: [Pharo-project] Two objects with same hash

by Denis Kudriashov

I am sure I see It in some block bost. But dont remember 2011/9/23 Mariano Martinez Peck <marianopeck(a)gmail.com> > > > On Fri, Sep 23, 2011 at 3:02 PM, Denis Kudriashov <dionisiydk(a)gmail.com>wrote: > >> Thank you for all your responses. I will use UUID. >> >> Another assumption: >> I know there is a trick to get object memory address. >> > > which one? > > >> Can it be used for object identity? (inside memory of objects) >> >> >> >> * >> * >> 2011/9/23 Marcus Denker <marcus.denker(a)inria.fr> >> >>> >>> On Sep 23, 2011, at 1:08 PM, Denis Kudriashov wrote: >>> >>> > Hello, >>> > >>> > I use hash message to generate unique object id. (unique between >>> current memory objects). >>> > And I catch situation when two objects has same hash value. Objects has >>> been created in loop almost at same time. >>> > >>> > So my question - is it really possible? >>> >>> Yes, easily, as there are only 12 bits for the hash, there are only 4096 >>> different hash values. >>> >>> This means that a hash is *not* at all a UUID, and all hashing data >>> structures need to be optimized >>> for the case of hash collision, as it will happen a lot. >>> >>> Marcus >>> >>> >>> -- >>> Marcus Denker -- http://marcusdenker.de >>> >>> >>> >> > > > -- > Mariano > http://marianopeck.wordpress.com > >

Sept. 23, 2011

[Pharo-project] Re : looking for boring morphs

by Alain Plantec

Hi Esteban, As an entry point, you have PluggableTextFieldMorph. You can build one with UITheme class >> newTextEntryIn: aThemedMorph for: aModel get: getSel set: setSel class: aClass getEnabled: enabledSel help: helpText see the 'class:' argument. As an example, if you pass Integer, then a specific converter is used so that you can only enter a valid integer. AFAIK, so far we have converters for String and Number. To implement new converters (to and from Date as an example), dig into PluggableTextFieldMorph>>convertTo: aClass Â Â Â "Set the converter object class." Â Â Â self converter isNil Â Â Â Â Â Â Â ifTrue: [self converter: (ObjectStringConverter forClass: aClass)] Â Â Â Â Â Â Â ifFalse: [self converter objectClass: aClass] and indeed, it would be could to integrate new converters. See SetingDeclaration>>inputWidgetForString as an client example. Cheers Alain

Sept. 23, 2011