September 2017 - Pharo-users

execute a code block at a given time in pharo ?
by Daniel BLANC Oct. 4, 2017

Oct. 4, 2017

Hi All, I'm a very beginner with smalltalk. I am building a small seaside app for controlling wifi access of my teenagers kids. In this app I need to start or stop the wifi acces at a given time. For the moment I'm doing it with an infinite loop in a process, with this code: WifiController >> startScheduler ^ SchedulerProcess ifNil: [ SchedulerProcess := [ [ true ] whileTrue: [ self schedulerApplyAutoStartStopRules. 56 seconds wait ] ] forkNamed: 'DanWifiManagerScheduler' ] I'm wondering if there is a way to do this without this infinite loop ? May be there is a class in the standard pharo image that can execute a code block at a given time ? Thanks, Daniel

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"Leaking" CommandLineHandler when running headless image
by Holger Freyther Oct. 3, 2017

Oct. 3, 2017

Hi, I am currently trying to run one of my images as non-root and related to that look into keeping changes in a different directory or not writing them at all. While looking at a write failure I saw some paths being logged that I used during CI to load code and should have been GCed. Observation: Pharo --headless My.image eval "Smalltalk garbageCollect. CommandLineHandler allSubInstances size" 84 Pharo --headfull My.image eval "Smalltalk garbageCollect. CommandLineHandler allSubInstances size" 2 As part of the CommandLineHandler allSubInstances there are eight LoadUpdatesCommandLineHandler still active. I would assume that a full GC should have collected them by now (some of them being created in May). In a headfull image they disappear quickly I varied the execution a bit: Pharo --headless RoamingHub.image eval --no-quit "[ Smalltalk garbageCollect. FileStream stdout print: CommandLineHandler allSubInstances size; lf. Smalltalk snapshot: false andQuit: true] fork" 0 Hypothesis: * Command line handlers call >>#snapshot:andQuit:. * Image resumes in this process * New session created * Command line handlers execute * Calls snapshot:andQuit: * Image resumes.. * New session created * Command line handlers execute ... Can this be true? I think the proposal to start the image differently would help here? Any comments/ideas? holger

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Spec "bindings"
by Rob Rothwell Oct. 3, 2017

Oct. 3, 2017

Hello, I was wondering what more experienced users than myself thought of the idea of an explicit Spec "connection point" to a domain model object similar to Dolphin's "showOn:" method, like: CounterApp showOn: counter. This would perhaps trigger something like Dolphin's Presenter>>model: message (although I've always found the use of "model" confusing when there are so many "models" involved.) after the widgets had been created: ComposableModel>>initializeBindings: anObject In many cases, if your domain model uses ValueHolders as well (like Spec does), making a connection could just mean replacing the Spec ValueHolder with your domain ValueHolder so changes to the domain model would automatically propagate to the UI presentation without providing explicit code in ComposableModel>>initializePresenter. However, since I am still trying to understand and learn Spec, it's quite possible I am missing some key point and there are reasons not to explore this line of thinking! Thank you, Rob

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Testing a Unicode Character's Category
by Prof. Andrew P. Black Oct. 3, 2017

Oct. 3, 2017

The Pharo image has a table of Unicode Character Categories in a class variable GeneralCategory of class Unicode. But there do not seem to be many methods to interpret this data. For example, while there is a method Unicode class >> #isDigit: aCharacter that checks if the Unicode category of aCharacter is Nd, and Unicode class >> #isLetter: aCharacter that checks if aCharacter is in one of the letter categories, there does not seem to be a general way of asking âwhat is the category of this characterâ. I want to check if a character is a mathematical symbol, that is, if it is in the Unicode Category Sm. Whatâs the right way of doing this? Would it be reasonable to add a method Unicode class >> #category: aCharacter that answers one of the 29 category symbols #Cc to #Zs? Or âisâ methods for each category? Andrew

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Roasssal not working on Windows with Pharo 6.1
by kmo Oct. 2, 2017

Oct. 2, 2017

Is it just me or my systems but is there a major problem with Roassal on Pharo 6.1 on Windows? At work on my Windows 7 machine, Roassal installs from the catalog browser but the examples will not run. I get an error - External module not found. it seems to be looking for the Surface dll which is definitely present in the pharo folder. On my Windows 10 netbook, Roassal will not even install from the catalog browser. It starts to install then comes up with an unhelpful "something has gone wrong" message. Roassal still works in Pharo 5. So is this just a 6.1 issue? -- Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html

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How to set library path for UFFI on Linux?
by Dan Wilczak Sept. 30, 2017

Sept. 30, 2017

I've just installed the 64-bit version of Pharo 6.1 on OpenSuse linux (64 bit). The Athens demos fail because UFFI looks for libcairo in /usr/lib rather the /usr/lib64. I tried setting LD_LIBRARY_PATH but that has no effect. How can I force it to use lib64? Dan -- Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html

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[ Spec ]How can I get input and field with a fixed height?
by Stephane Ducasse Sept. 30, 2017

Sept. 30, 2017

Hi I would like to be able to get combo box, input field with a fixed height. Any ideas? Stef

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Pharo 6.1 UDCBSQLite problem, masked behind "Error: External module not found"?
by Herby VojÄÃk Sept. 30, 2017

Sept. 30, 2017

Hello! I got the strange error first reported as "External module not found", but after putting a few diagnostic transcript outputs to the code: TowergameSyncTests >> setUp Transcript cr; show: self; cr; show: 'ENTER setUp'; cr. dao := Towergame daoForLogin: self loginToTemporaryDatabase. session := dao glorpSession. Transcript cr; show: 'LEAVE setUp'; cr. TowergameSyncTests >> tearDown Transcript cr; show: 'ENTER tearDown'; cr. session logout. Transcript cr; show: 'LEAVE tearDown'; cr. I got this in an (excerpt of an) output in my Go CD agent. It runs on 32bit Ubuntu 16.04.3, uses 61+vm: 13:10:58.277 [go] Start to execute task: Plugin with ID: script-executor. 13:10:58.295 [script-executor] OS detected: 'Linux'. Is Windows? false 13:10:58.313 [script-executor] Script written into '/var/lib/go-agent/pipelines/filmtower-srv/cffa4492-a817-41e0-bb64-72a9e5a3d890.sh'. 13:10:58.325 + cd code 13:10:58.325 + ../pharo/pharo ./filmtower.image conf/run-tests.st 13:10:58.866 13:10:58.867 TowergameServerTests 13:10:58.961 4 run, 4 passes, 0 skipped, 0 expected failures, 0 failures, 0 errors, 0 unexpected passes 13:10:58.962 13:10:58.962 TowergameSyncTests 13:10:58.962 13:10:58.962 TowergameSyncTests>>#testPlayerCanHaveDisabledDeviceSaved 13:10:58.962 ENTER setUp 13:10:58.991 13:10:58.991 ENTER tearDown 13:10:58.994 13:10:58.995 TowergameSyncTests>>#testPlayerChecksStateVersion 13:10:58.995 ENTER setUp 13:10:59.000 13:10:59.000 ENTER tearDown 13:10:59.001 13:10:59.002 TowergameSyncTests>>#testPlayerChecksStateVersionAndHasFreshlyInstalled 13:10:59.002 ENTER setUp 13:10:59.014 13:10:59.015 ENTER tearDown 13:10:59.015 13:10:59.021 TowergameSyncTests>>#testPlayerChecksStateVersionAndIsBehind 13:10:59.021 ENTER setUp 13:10:59.031 Error: External module not found 13:10:59.031 ExternalLibraryFunction(Object)>>error: 13:10:59.033 ExternalLibraryFunction(Object)>>externalCallFailed 13:10:59.034 ExternalLibraryFunction(ExternalFunction)>>invokeWithArguments: 13:10:59.034 UDBCSQLite3DatabaseExternalObject class>>finalizeResourceData: 13:10:59.035 FFICalloutAPI>>function:module: 13:10:59.035 UDBCSQLite3Library(Object)>>ffiCall:module: 13:10:59.036 UDBCSQLite3DatabaseExternalObject class>>finalizeResourceData: 13:10:59.036 FFIExternalResourceExecutor>>finalize 13:10:59.036 WeakFinalizerItem>>finalizeValues 13:10:59.059 [ each finalizeValues ] in [ :each | [ each finalizeValues ] on: Exception fork: [ :ex | ex pass ] ] in WeakRegistry>>finalizeValues in Block: [ each finalizeValues ] 13:10:59.059 BlockClosure>>on:do: 13:10:59.079 [ Processor terminateActive ] in [ :ex | 13:10:59.079 | copy onDoCtx process handler bottom thisCtx | 13:10:59.079 onDoCtx := thisContext. 13:10:59.079 thisCtx := onDoCtx home. 13:10:59.079 13:10:59.079 "find the context on stack for which this method's is sender" 13:10:59.079 [ onDoCtx sender == thisCtx ] 13:10:59.079 whileFalse: [ onDoCtx := onDoCtx sender. 13:10:59.079 onDoCtx 13:10:59.079 ifNil: [ "Can't find our home context. seems like we're already forked 13:10:59.079 and handling another exception in new thread. In this case, just pass it through handler." ^ handlerAction cull: ex ] ]. 13:10:59.079 bottom := [ Processor terminateActive ] asContext. 13:10:59.079 onDoCtx privSender: bottom. 13:10:59.079 handler := [ handlerAction cull: ex ] asContext. 13:10:59.080 handler privSender: thisContext sender. 13:10:59.081 (Process forContext: handler priority: Processor activePriority) 13:10:59.081 resume. 13:10:59.081 13:10:59.081 "cut the stack of current process" 13:10:59.081 thisContext privSender: thisCtx. 13:10:59.082 nil ] in BlockClosure>>on:fork: in Block: [ Processor terminateActive ] 13:10:59.226 13:10:59.228 [script-executor] Script completed with exit code: 1. 13:10:59.285 [go] Current job status: failed. There are two dimensions to this: 1. It is not "External module not found" as far as I can say, as a few tests passed, going through both setUp and tearDown. Something is wrong when finalizers kick in. FWIW, the login I use to log in the test db, created anew each time, because it is SQLite temp db, is: TowergameSyncTests >> loginToTemporaryDatabase ^ Login new database: UDBCSQLite3Platform new; host: ''; port: ''; username: ''; password: ''; databaseName: ''; yourself If I understood correctly, it creates db backed by temp file which gets removed once connection closes. Everything works fine in my dev machine (Win 10, non-headless), where tests just pass fine. 2. Where are "LEAVE setUp" and "LEAVE tearDown" messages? They are missing from the transcipt (again, on dev machine, in non-headless mode, they show up in the Transcript window). Can someone hint at what is wrong / udbcsqlite authors look at if there isn't something incorrect in the sqlite driver / library? I don't know what to do in this state. It seems it should just work. (I can upload the image somewhere if you're interested). Thanks, Herby P.S.: I tried on 64-bit linux (Ubuntu 14.04) with get.pharo.org/64/61+vm, and ran things that Go CD job does by hand. The output is the same (few tests run, then finalizers crash the image). P.P.S.: When tried again and again trying just the last line (... run-tests.st), it consistently crashes the same way.

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Re: [Pharo-users] Bloc Space within a Space
by Sean P. DeNigris Sept. 29, 2017

Sept. 29, 2017

Pharo Smalltalk Users mailing list wrote >> But how to drive it? e.g. simulate events > > ok, so we agree here. Bloc is done in that perspective. > For now, you have to implement your own BlocSpace with an adequate > #processEvents method, > your can also implement your own main loop manager (polymorphic with > BlMainLoopManager). Given the flurry of Bloc development, are we able (or any closer) today to simulate a Bloc world/space/whatever-the-lingo-is, taking full control over the hand, events, etc? For years I've dreamed of being able to mock/stub out all the dependencies and have full control over a world within a world. There seemed to be agreement in principle, but it always seemed "just around the bend". I loaded Bloc in latest Pharo to play around, but am not quite sure if this is yet possible. Thanks! ----- Cheers, Sean -- Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html

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[Demo] Creating Bloc Widgets with Pharo
by Stephan Eggermont Sept. 29, 2017

Sept. 29, 2017

Bloc is ready for your experiments. Here is my first one. Please let me know what and how to improve. Bloc allows for the creation of beautiful widgets. Here is a panel containing collapsible subpanels that can be reordered with drag-and-drop. https://vimeo.com/235934701 Stephan

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