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

Re: [Pharo-project] [Vm-dev] Fwd: System time
by David T. Lewis May 4, 2011

May 4, 2011

On Tue, May 03, 2011 at 04:02:04AM +0200, Levente Uzonyi wrote: > > On Mon, 2 May 2011, David T. Lewis wrote: > > > >I have not looked at this carefully, but I suspect an issue in Chronology > >(as opposed to a VM or primitive issue). DateAndTime initializes some > >cached > >values at image startup time, and thereafter calculates things based on the > >millisecond clock. If the millisecond clock drifts with respect to system > >time > >on the underlying platform (as presumably would be the case if the system > >clock > >is synchronized using ntp), then DateAndTime's opinion about current time > >will > >drift with respect to the underlying platform. > > The amount of the drift seems to be 1 millisecond every 14-16 seconds on > my pc. I wrote some code to get the system time via FFI[1], then ran the > following: > > | data | > data := (1 to: 100) collect: [ :run | > 1 seconds asDelay wait. > { DateAndTime now. Win32SystemTime localDateAndTime } ]. > (data collect: [ :each | each first - each second ] as: Set) sorted explore > > > Levente > > [1] http://leves.web.elte.hu/squeak/Win32SystemTime.st I am now running a similar test (attached) on Linux. I was expecting to see clock drift exactly the same as that reported on Windows, but so far after about 15 minutes I see no obvious signs of drift. I cannot explain this but I'll leave it running for a while and see if anything interesting happens. Dave sample output: === Started at 2011-05-03T20:24:35.03-04:00 === Test duration 0:00:15:46.01 OS time now: 2011-05-03T20:40:21.039466-04:00 Squeak time now: 2011-05-03T20:40:21.04-04:00 Difference: 0:00:00:00.000534 Drift: 0:00:00:00.000075 === Started at 2011-05-03T20:24:35.03-04:00 === Test duration 0:00:15:49.072 OS time now: 2011-05-03T20:40:24.101675-04:00 Squeak time now: 2011-05-03T20:40:24.102-04:00 Difference: 0:00:00:00.000325 Drift: -0:00:00:00.000134 === Started at 2011-05-03T20:24:35.03-04:00 === Test duration 0:00:15:52.102 OS time now: 2011-05-03T20:40:27.131382-04:00 Squeak time now: 2011-05-03T20:40:27.132-04:00 Difference: 0:00:00:00.000618 Drift: 0:00:00:00.000159 === Started at 2011-05-03T20:24:35.03-04:00 === Test duration 0:00:15:55.136 OS time now: 2011-05-03T20:40:30.165711-04:00 Squeak time now: 2011-05-03T20:40:30.166-04:00 Difference: 0:00:00:00.000289 Drift: -0:00:00:00.00017

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[Pharo-project] Fwd: [Pharocasts] New comment on SandstoneDb, simple ActiveRecord style persistence....
by laurent laffont May 4, 2011

May 4, 2011

Someone knows ? Laurent ---------- Forwarded message ---------- From: Bernat Romagosa <noreply-comment(a)blogger.com> Date: Wed, May 4, 2011 at 1:37 PM Subject: [Pharocasts] New comment on SandstoneDb, simple ActiveRecord style persistence.... To: laurent.laffont(a)gmail.com Bernat Romagosa <http://www.blogger.com/profile/04492856362620588522> has left a new comment on your post "SandstoneDb, simple ActiveRecord style persistence...<http://www.pharocasts.com/2010/04/sandstonedb-simple-activerecord-style.html>": I was trying to migrate a simple image-based persistence app into Sandstone, so I just recompiled my biz objects to be subclasses of SDActiveRecord, but of course the objects I want to save are already created and "floating" in the image, so when I try to save them I get an error as many instvars haven't been initialized upon creating these objects (as they were already there). Is there a way to automatically do this? Thanks! Bernat. Posted by Bernat Romagosa to Pharocasts <http://www.pharocasts.com/> at May 4, 2011 4:37 AM

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Re: [Pharo-project] About SqueakDBX
by Mariano Martinez Peck May 4, 2011

May 4, 2011

On Wed, May 4, 2011 at 2:30 PM, Nicolas Petton <petton.nicolas(a)gmail.com>wrote: > Hi Mariano, > Hi Nicolas. Please, let me answer in the mailing list so that other can benefit also. > > I was wondering what can SqueakDBX do. http://www.squeakdbx.org/ here you have all you will probably need. In summary, it is a database driver. Like ODBC or like any other wrapper. The good thing is that it provides the same API to all databases and since there is no SQL conversion, you can exploit the benefits of each database. SqueakDBX delegates to the C library OpenDBX, which delegates to the C database client library. So...the "worst" thing of SqueakDBX is that you need the OpenDBX library and the database client libraries. This is explained here: http://www.squeakdbx.org/Architecture%20and%20desing Features: http://www.squeakdbx.org/Targets%20and%20Features Documentation: http://www.squeakdbx.org/documentation > How stable/scalable is it? Is > SqueakDBX itself is really stable. It is being used in several production apps without problems. The only tricky (depending on the OS and database) is to install OpenDBX + client libraries. But once it is working, is really stable. > there an ORM on top of it? > > Yes, it is called GlorpDBX, which is a modified version of the Glorp port to squeak (which was all hardcoded to the postgresql native driver). That version is a little old and we only make it work for PostgreSQL, Oracle, MySQL and MSSQL. However, ESUG has sponsored again. The project is being renamed to DBXTalk and the team (the students) are working in two important things: 1) new port (with the latest code) from Glorp of VW to pharo. And try to automatize the process for the future. 2) new mapping tool on top of squeakDBX but much simpler than Glorp. Something like ActiveRecord or SandstoneDB. The main idea for now is to use Magritte for describing the mappings. These two things are just starting.....so you will have to wait ;) -- Mariano http://marianopeck.wordpress.com

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[Pharo-project] RFC: PluggableTextMorphWithLimits
by Benjamin May 4, 2011

May 4, 2011

Hello Smalltalkers, I'm currently working on new code editing tools, and I've implemented a new subclass of PluggableTextMorph named PluggableTextMorphWithLimits , with a code oriented feature: You have a warningLimit ( 350 by default ) and an alertLimit ( 2* warningLimit by default ), and the number of characters of the text displayed is counted ( without space, tabs, cr etc). If you are below the warning limit, the background is white ( or the default color ), if you are between warningLimit and alertLimit, the background turn more and more yellow, and if you are above the alertLimit, the background turn orange :) After using it for ten minutes, you start shivering when the background turn yellow ;) Gofer new squeaksource: 'Nautilus'; package: 'PluggableTextMorphWithLimits'; load. You can test it by evaluating: PluggableTextMorphWithLimits example. I think it will be used by Nautilus, but maybe more code editing tools should used it. Thanks in advance for your feedback :) Ben

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[Pharo-project] Timespan #intersection: yields wrong result
by Johan Brichau May 4, 2011

May 4, 2011

Hi, I traced a bug when working with timespans to the following issue illustrated in the code snippet below. The last expression in the snippet yields false, although it should yield true (imho). |start end span| start :=DateAndTime now. end := start + 1 hour. span := Timespan starting: start ending: end. (span intersection: span) = span --> false I think that the intersection of a span with itself, should be itself. The origin of the problem is that Timespan>>intersection: creates a new timespan roughly as follows: Timespan starting: aBegin ending: self end. But Timespan>>end returns the end time of the timespan minus the clockprecision. As such, the intersecting span is a nanosecond shorter than the one we would expect. This eventually yields wrong results when working with timespans. The real question now is: should the implementation of Timespan>>intersection be changed -or- should Timespan>>end really return the (non-included) end time (that was passed when constructing it)? I sent this email to bugs(a)chronos-st.org, but a discussion here probably will not hurt either. Best regards Johan Brichau

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[Pharo-project] ZnClient ConnectionTimedOut
by Jimmie Houchin May 4, 2011

May 4, 2011

Hello, I am happily use ZincHttpComponents, specifically ZnClient for my application. I make a request to the Python server part of my application which retrieves data from another server. This at times takes longer than the provided "timeout" for a connection. I am currently doing, ZnClient get: url. How can I increase the "timeout" for retrieving my data. Any help greatly appreciated. Thanks. Jimmie

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[Pharo-project] [COTDC] 57 - ColorMap
by laurent laffont May 3, 2011

May 3, 2011

Today: ColorMap 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

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[Pharo-project] [update 1.3] #13181
by Marcus Denker May 3, 2011

May 3, 2011

13181 ----- Issue 4158: Delete SystemWindow>>convertAlignment Issue 4129: #assert:equals: is the opposite as expected Issue 4077: Dictionary at:ifPresent: performance issues on Cog VM -- Marcus Denker -- http://www.marcusdenker.de INRIA Lille -- Nord Europe. Team RMoD.

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[Pharo-project] Fwd: [Pharo-users] [update 1.3] #13180
by Marcus Denker May 3, 2011

May 3, 2011

Begin forwarded message: > From: Marcus Denker <marcus.denker(a)inria.fr> > Date: May 3, 2011 7:40:01 PM GMT+02:00 > To: A friendly place where any question about pharo is welcome <pharo-users(a)lists.gforge.inria.fr> > Subject: [Pharo-users] [update 1.3] #13180 > Reply-To: A friendly place where any question about pharo is welcome <pharo-users(a)lists.gforge.inria.fr> > > 13180 > ----- > > Issue 4075: when you execute a script in headless mode, doesnt quit > Issue 4144: MessageSet buildWith: is unused and can be removed > Issue 4128: update links of Announcements help > Issue 4120: CrLfFileStream needs to be moved to Compatibility package > Issue 4149: Fix a deprecation in SHParserST80 (fixed by undeprecated) > > > -- > Marcus Denker -- http://www.marcusdenker.de > INRIA Lille -- Nord Europe. Team RMoD. > > -- Marcus Denker -- http://www.marcusdenker.de INRIA Lille -- Nord Europe. Team RMoD.

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[Pharo-project] SVN vs Git for the cogvm
by Torsten Bergmann May 3, 2011

May 3, 2011

>if so, the merge will always be more complicated and the differences >will be more and more... The more you branch/fork/clone the more you have to manage. Does switching to SVN with one "trunk" help? Sorry couldnt resist ;) Bye T. -- NEU: FreePhone - kostenlos mobil telefonieren und surfen! Jetzt informieren: http://www.gmx.net/de/go/freephone

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