April 2015 - Pharo-users - lists.pharo.org

VoyageMongo and Aggregate functions
by Tommaso Dal Sasso May 1, 2015

May 1, 2015

Hi, I am using VoyageMongo to store some data in a mongo database, and I am trying to use some aggregate functions or map/reduce approach, as shown on http://docs.mongodb.org/manual/aggregation/. Is it possible to do it in Voyage, even by directly calling the MongoTalk objects? I am interested in this because it is much more efficient than loading all the data in the pharo image and selecting it afterwards. Thanks, Tommaso (and Roberto)

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OSProcess output to pharo
by Lusa Nicolas May 1, 2015

May 1, 2015

Hi, I am doing some work with OSProcess and I want to get the output directly to pharo (i.e. a stream or a byteString would be cool). I have found this on the web http://pharo.gemtalksystems.com/book/PharoTools/OSProcess/ where it's said that if you want access to the output you have to use PipeableOSProcess from CommandShell project. My question is: is still this the correct way to do it or meanwhile in OSProcess something was implemented to handle this specific case? Thanks. Cheers, Nicolas

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[Ann] MorphicDraw
by Stephan Eggermont April 30, 2015

April 30, 2015

To better understand Morphic, I've started writing a small application that can draw shapes and connect them. A pdf documenting what I've done is at https://github.com/StephanEggermont/MorphicDraw Code is on smalltalkhub, StephanEggermont/MorphicDraw Suggestions, fixes and improvements are welcome Stephan

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[ANN] Screencast on Versionner
by Esteban Lorenzano April 30, 2015

April 30, 2015

Hi, I made a small video on how to use Versionner. Versionner allows you to manage project configurations in a smooth way. https://youtu.be/cFRJDuWL-Q0 <https://youtu.be/cFRJDuWL-Q0> I knowâ¦ is not âKilonâs qualityââ¦ but I hope it will help :) cheers, Esteban

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Reddit discussion (rant) about Pharo 4.0 first time users' experiences
by Esteban A. Maringolo April 30, 2015

April 30, 2015

I don't agree with most of the things mentioned, but I think its worth looking at to see if there is something to actually improve. http://www.reddit.com/r/smalltalk/comments/32xwmr/my_experience_with_pharo_… Regards, Esteban A. Maringolo

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MagicMagritte in Pharo 40.
by stepharo April 30, 2015

April 30, 2015

Hi sean when I load magic magritte I get some messages about ContextPart. I proceeded but just to let you know. Maybe this is a magritte issue. Stef

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Cypress - cross platform Pharo & Visualworks
by Ben Coman April 30, 2015

April 30, 2015

Is anyone using cross-platform Pharo / VisualWorks development with Cypress? https://github.com/CampSmalltalk/Cypress cheers -ben

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Fuel version
by Johannes Rasche Kreuzberg April 30, 2015

April 30, 2015

Hi folks, I'm just migrating to Pharo 4.0 On materialization of objects serialized under Pharo 3 an error was raised: different versions numbers ( 194 required ). Where does version 194 come from ? Monticello from Pharo 3 offers 193 Johannes

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Pharo and Hadoop
by phil＠highoctane.be April 30, 2015

April 30, 2015

I am involved in some Hadoop deployments and there is a very interesting possiblity for Pharo in that ecosystem. Namely, there is a YARN thing in there which is a scheduler for distributing computing on a cluster of nodes. It is possible to deploy all kinds of technologies on the nodes (e.g. Python, R, Java) and Pharo images and VM (in headless mode) could be deployed as well. The deployed node can communicate back to what is called an AppllicationManager via REST callbacks (easy game in Pharo). There is also a C API (now, this is FFI or a plugin - http://zookeeper.apache.org/doc/trunk/zookeeperProgrammers.html) There is also an Hadoop component named ZooKeeper that focuses on acting as a distributed configuration repository. One can talk to it with REST too ( https://github.com/apache/zookeeper/tree/trunk/src/contrib/rest) Given the fact that we also can use some Java calls (using the JNI module with 32-bits Java), we can integrate well enough on YARN I'd say. There is also another project which is very nice and this is SLIDER (on YARN). This is about deploying stuff in an elastic way, (see http://slider.incubator.apache.org/) The next logical thing is to have docker containers (containing a pharo stack) deployed dynamically on the cluster using Slider (like this: http://www.slideshare.net/hortonworks/docker-on-slider-45493303) First step here would be to have a basic YARN-Pharo application and a PoC for talking to ZooKeeper. This would open interesting gates for Pharo given its strengths. Even more when we'll get a 64-bit VM. What is cool with Pharo is that an image can be very small and self containing vs Java application (which have tons of Jar files attached). Access to the data on the HDFS thing can happen through NFSv3 so, we can go that route. There is also a REST API to it ( https://hadoop.apache.org/docs/r1.0.4/webhdfs.html) Tell me what you think! Phil

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Getting all the references to an object
by Sergio Fedi April 30, 2015

April 30, 2015

In other smalltalks I used to send #allReferences to know, well, its obvious. But this approach didn't work on Pharo. How can I do that?

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