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• EMC Acquires Archer for IT Governance

  The data storage giant starts the new year with — what else? — an acquisition.

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• Python: Inheritance of a class attribute (list)

  - by Sano98

  Hi everyone, inheriting a class attribute from a super class and later changing the value for the subclass works fine: class Unit(object): value = 10 class Archer(Unit): pass print Unit.value print Archer.value Archer.value = 5 print Unit.value print Archer.value leads to the output: 10 10 10 5 which is just fine: Archer inherits the value from Unit, but when I change Archer's value, Unit's value remains untouched. Now, if the inherited value is a list, the shallow copy effect strikes and the value of the superclass is also affected: class Unit(object): listvalue = [10] class Archer(Unit): pass print Unit.listvalue print Archer.listvalue Archer.listvalue[0] = 5 print Unit.listvalue print Archer.listvalue Output: 10 10 5 5 Is there a way to "deep copy" a list when inheriting it from the super class? Many thanks Sano

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• Comma Seperated Values and LIKE php/mysql Troubles

  - by Jay

  The Set up This is more or less a follow up question to something I had previously posted regarding comma separated values (explode,implode). Here's the scenario which has been stomping me the last few days as I'm a noob--sorry for the lengthy post. I'm passing a variable via the url (index.php?id=variable), I then check the database to find the rows containing that variable using SELECT * FROM table WHERE column LIKE '%$variable%' I'm using the wildcards because the results are a comma separated value with the variable appearing multiple times in the database. So if we were assigning-- say schools to popular tv shows..my database is set up so that the user can assign more than one school to the tv show. IE. South Park-- fsu, nyu ,mit Archer -- harvard, nyu Index.php?id=nyu would display Sourth Park & Archer. The Problem Because I am using Like '%variable%' If I have the following: South Park--uark Archer--ua index.php?=ua Instead of just Archer showing, Southpark would also show. Which makes sense due to the wildcards...but can anyone think of a way to do this achieving the results I want?..Is there any way achieve more precise results using a comma separated value?..I'm completely stomped and will appreciate any help.

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• Python: Class factory using user input as class names

  - by Sano98

  Hi everyone, I want to add class atttributes to a superclass dynamically. Furthermore, I want to create classes that inherit from this superclass dynamically, and the name of those subclasses should depend on user input. There is a superclass "Unit", to which I can add attributes at runtime. This already works. def add_attr (cls, name, value): setattr(cls, name, value) class Unit(object): pass class Archer(Unit): pass myArcher = Archer() add_attr(Unit, 'strength', 5) print "Strenght ofmyarcher: " + str(myArcher.strength) Archer.strength = 2 print "Strenght ofmyarcher: " + str(myArcher.strength) This leads to the desired output: Strenght ofmyarcher: 5 Strenght ofmyarcher: 2 But now I don't want to predefine the subclass Archer, but I'd rather let the user decide how to call this subclass. I've tried something like this: class Meta(type, subclassname): def __new__(cls, subclassname, bases, dct): return type.__new__(cls, subclassname, Unit, dct) factory = Meta() factory.__new__("Soldier") but no luck. I guess I haven't really understood what new does here. What I want as a result here is class Soldier(Unit): pass being created by the factory. And if I call the factory with the argument "Knight", I'd like a class Knight, subclass of Unit, to be created. Any ideas? Many thanks in advance! Bye -Sano

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• Flash/Flex/Air and iOS

  - by David Archer

  I'm just a little confused with all of the news recently regarding the cancellation of mobile flash, so was hoping for a little help. I've had a search through and can't find the answers to these questions, so any help would be great. First up, I'm looking to create a game in Flash first, to test whether the concept works as a fun game (on Newgrounds/Kongregate/Facebook etc.). Would it be best to use Flash CS5.5, or Flash Builder? Secondly, with mobile flash now being discontinued by Adobe, could I still port this game over to iOS through the Flash platform, or would it be better at that point to re-write the whole game using Objective C? (NOTE: I'm not an Objective C developer, but am instead a Javascript and Actionscript dev). Any help would be great. Thanks!

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• How can I move from Java and ColdFusion to Ruby on Rails?

  - by Ciaran Archer

  Currently I work with ColdFusion 9+ and some Java in a Windows environment. Prior to ColdFusion, my background was in Java and JSP. I'm considering a move towards Ruby on Rails, as I think it would be a real challenge, keep things fresh, and provide more job opportunities. In order to get into it, I started to build my personal website in Rails 3.0. But what else can I do to make this transition from what I know now to Ruby and Rails? Are there specific or idiomatic aspects of Ruby or Rails I should keep in mind when switching over from a ColdFusion and Java mindset?

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• What is a name for a job where you do system analysis, project management and data diagramming?

  - by David Archer

  In the last 4 months I've been able to manage a team and step away from the coding for a bit. I've been planning the system in full (both System Analysis and project managing, alongside action and data diagramming) writing the technical documentation, the code's architecture, keeping track of the other guys doing the actual coding, QA, bug reports and dealing with clients. I had to take two days' training on node.js just to see if it would be suitable for a project we were considering. Is there a name for this job? Project Manager and Systems Architect don't quite seem to have the same stuff, and IT manager seems way off. I only want to know so that I can get some qualification towards it and try to move into this kind of work full-time.

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• Advice for someone moving from Windows / Coldfusion / Java to Linux / Ruby / Rails

  - by Ciaran Archer

  Hi all I am thinking of undertaking a serious career move. Currently I work day to day with ColdFusion 9+, and some Java in a Windows environment. My background is Java/JSP etc prior to ColdFusion. I'm considering a move towards Ruby / Rails on Linux as I think it would be a real challenge, keep things fresh and would stand me in good stead for the next few years. There are also more jobs in this area. I would consider myself an experienced web professional. I do TDD and I understand good OO design concepts. I have worked for the past few years on a busy transactional gaming website with all the security and performance challenges that entails. I have also contributed to an open source ColdFusion project recently and I am a active member of the CF community on StackOverflow . In order to maintain my current remuneration (!) etc. I would like to get up to speed on Ruby / Rails and Linux before I go job hunting. The idea is that I can demonstrate enough proficiency in these new skills and combined with my other language / programming / architectural and performance experience I have I'll be a good candidate. I am building a personal website in Rails 3.0 on Ubuntu which I hope will expose me to lots of Rails/Ruby and I am reading a few books. What else can I do? Has anyone made this type of move, and if so would they have any tips apart from what I've mentioned? Is there any areas around Rails/Ruby/Linux that I have to get up to speed with? Any and all tips are appreciated.

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• Advice for Setting up an On-Call Team

  - by Ciaran Archer

  I'm leading a largish development team (~35 developers). We are doing primarily Web Development work on a number of sites. Historically the knowledge on the teams has been pretty siloed. If you worked on Site A you will know how to troubleshoot it, but you would not be a lot of help on Site B. We also have a few cross-cutting concerns, i.e. common components used between sites which require specialized knowledge to troubleshoot. With all this in mind, I'm trying to understand the best way to setup an on-call team. This would be a team of programmers who would be available to deal with out-of-hours emergency issues occasionally (say one call every 2 weeks). They may be required to deploy emergency fixes. Part of me is saying we can't have a big on-call team with shallow knowledge, instead we need a smaller team with deep knowledge who can expect to be on-call more often and remunerated as such. Does anyone have any suggestions based on experience on how to setup this team? Thanks in advance.

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• A good example project to 'prove' my skills [closed]

  - by David Archer

  I've been a commercial programmer for about 3 years now but all of my commercial work is based upon PHP (with Cake PHP, Wordpress and Wildfire) and ASP.Net (on C#, including MVC 3, Umbraco and Kentico) as well as plenty of HTML/CSS/jQuery examples to show. A future employer has asked me to show my Ruby on Rails potential. I've done Ruby on Rails before for fun, but nothing worthy of commercial showing. What I'd like to know, from a group of programmers, is what would be a good 'portfolio demo' piece for you? What have you seen in the past that impressed you? What are you looking for? For Ruby lead developers specifically, what sort of things are you looking to see in the code? Cheers!

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• Unity 3d (Using Blender) - anime/manga/cel-shaded style characters

  - by David Archer

  Making a game using Blender for 3D models and Unity for the game engine. Just wondering if anyone knows any links to pages that give a tutorial on Japanese anime style 3D modelling, texturing and shading through blender. I'm actually looking to create a cel-shaded look eventually (read: Okami/Jet Set Radio style) and I'm kind of stuck with the design stuff. I'm not a Blender expert by any means, and still kind of new to the design side of things (I'm a programmer by trade), so please don't vote me down too hard. I've tried googling, but there doesn't seem to be much in the way of what I'm after. The only thing I've found really is a plugin for blender called freestyle, or using the ToonShader shading tool. If there are any good tutorials or anything, I'm really happy to sit through them - just want to learn :) Thanks for any help :)

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• Object-Oriented equivalent of LISP's progn function?

  - by Archer

  I'm currently writing a LISP parser that iterates through some AutoLISP code and does its best to make it a little easier to read (changing prefix notation to infix notation, changing setq assignments to "=" assignments, etc.) for those that aren't used to LISP code/only learned object oriented programming. While writing commands that LISP uses to add to a "library" of LISP commands, I came across the LISP command "progn". The only problem is that it looks like progn is simply executing code in a specific order and sometimes (not usually) assigning the last value to a variable. Am I incorrect in assuming that for translating progn to object-oriented understanding that I can simply forgo the progn function and print the statements that it contains? If not, what would be a good equivalent for progn in an object-oriented language?

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• Root access issues - how do others manage this?

  - by Ciaran Archer

  Hi there I use my Ubuntu 10.04 LTS instance (via Virtual Box on Windows 7) with a non-root user. I am trying out developing Rails applications and I notice that I need to run some rails commands with sudo. The problem this gives me is some files are created by the root user then, and I cannot edit them via a GNOME window with my logged in user. What is the correct thing to do here? Should I somehow always login as root? If so how? Is there some way for me to give all files under my home directory (where I do all my Rails work) the correct permissions for all users, so I can edit them with my logged in user via a window? At the moment I have to resort to opening a file via the command line like this sudo gedit myFile.rb - this is not very sustainable! Thanks in advance!

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• 2010 Collaboration Summit Impressions

  - by Elena Zannoni

  It's a bit late, but there you have it anyway. April 14 to 16 I attended the Linux Foundation Collaboration Summit in SFO. I was running two tracks, one on tracing and one on tools. You can see the tracks and the slides here: http://events.linuxfoundation.org/events/collaboration-summit/slides I was pretty busy both days, Thursday with a whole day tracing track, Friday with a half day toolchain track. The sessions were well attended, the rooms were full, with people spilling in the hallways. Some new things were presented, like Kernelshark, by Steve Rostedt, a GUI (yes, believe it or not, a GUI) written in GTK. It is very nice, showing a timeline for traced kernel events, and you can zoom in and filter at will. It works on the latest kernels, and it requires some new things/fixes in GTK. I don't recall exactly what version of GTK though. Dominique Toupin from Ericsson presented something about user requirements for tracing. Mostly though about who's who in the embedded world, and eclipse. Masami and Mathieu presented an update on their work. See their slides. The interesting thing to me was of course the new version of uprobes w/o underlying utrace presented by Jim Keniston. At the end of the session we had a discussion about the future of utrace. Roland wasn't there, butTom Tromey (also from RedHat) collected the feedback. Basically we are at a standstill now that utrace has been rejected yet again. There wasn't much advise that anybody could give, except jokingly, we decided that the only way in is to make it a part of perf events. There needs to be another refactoring, but most of all, this "killer app" that would be enabled because of utrace hasn't materialized yet. We think that having a good debugging story on Linux is enough of a killer app, for instance allowing multiple tracers, and not relying on SIGCHLD etc. I think this wasn't completely clear to the kernel community. Trying to achieve debugging via a gdb stub inside the kernel interfacing to utrace and that is controlled via the gdb remote protocol also lost its appeal (thankfully, since the gdb remote protocol is archaic). Somebody would have to be creative in how to submit utrace. It doesn't have to be called utrace (it was really a random choice, for lack of a letter that was not already used in front of the word "trace"). So basically, I think the ideas behind utrace are sound, and the necessity of a new interface is acknowledged. But I believe the integration/submission process with the kernel folks has to restart from scratch, clean slate. We'll see. There are many conferences and meetings coming up in the near future where things can be discussed further. On the second day, Friday, we had the tools talks. It was interesting to observe the more "kernel" oriented people's behavior towards the gcc etc community. The first talk was by Mark Mitchell, about Gcc and its new plugin architecture. After that, Paolo talked about the new C++1x standard, which will be finalized in 2011. Many features are already implemented in the libstdc++ library and gcc and usable today. We had a few minutes (really, the half day track was quite short) where Bradley Kuhn from the Software Freedom Law Center explained the GPLv3 exception for gcc (due to the new gcc plugin architecture and the availability of the intermediate results from the compilation, which is a new thing). I will not try to explain, but basically you cannot take the result of the preprocessing and then use that in your own proprietary compiler. After, we had a talk by Ian Taylor about the new Gold linker. One good thing in that area is that they are trying to make gold the new default linker (for instance Fedora will use gold as the distro linker). However gold is very different from binutils' old linker. It doesn't use a linker script, for instance. The kernel has been linked with gold many times as an exercise (the ground work was done by Kris Van Hees), but this needs to be constantly tested/monitored because the kernel linker script is very complex, and uses esoteric features (Wenji is now monitoring that each kernel RC can be built with gold). It was positive that people are now aware of gold and the need for it to be ported to more architectures. It seems that the porting is very easy, with little arch dependent code. Finally Tom Tromey presented about gdb and the archer project. Archer is a development branch of gdb mostly done by RedHat, where they are focusing on better c++ printing, c++ expression parsing, and plugins. The archer work is merged regularly in the gdb mainline. In general it was a good conference. I did miss most of the first day, because that's when I flew in. But I caught a couple of talks. Nothing earth shattering, except for Google giving each person registered a free Android phone. Yey.

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• LVM2 vs MDADM performance

  - by archer

  I've used MDADM + LVM2 on many boxes for quite a while. MDADM was serving for both RAID0 and RAID1 arrays, while LVM2 where used for logical volumes on top of MDADM. Recently I've found that LVM2 could be used w/o MDADM (thus minus one layer, as the result - less overhead) for both mirroring and stripping. However, some guys claims that READ PERFORMANCE on LVM2 for mirrored array is not that fast as for LVM2 (linear) on top of MDADM (RAID1) as LVM2 does not read from 2+ devices at a time, but use 2nd and higher devices in case of 1st device failure. MDADM reads from 2 devices at a time (even in mirrored mode). Who could confirm that?

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• xp vpn client dns issue

  - by David Archer

  Hi All, I have a problem with dns when connected to my work vpn. For ease of explanation I'll use the following in my outline of the problem: - name of my machine on work network is REMOTE_XP (original i know) - ip of my machine on work network is 192.168.2.80 - name of my machine on my local network is LOCAL_XP - ip of my machine on my local network is 10.0.0.3 What I want to be able to do when connected to vpn: - browse the internet from LOCAL_XP - ping by name REMOTE_XP Now it seems I've so far mentioned either 1 but not both of my wishlist. If i go to my vpn network properties (on LOCAL_XP) and uncheck the "use default dns on remote network" then I can browse the internet from my local machine but can't ping REMOTE_XP (though I can ping 192.168.2.80) If I check "use default dns..." then I can ping REMOTE_XP but can't browse the internet from LOCAL_XP. Is there a way I can have my dns cake and eat it, or will I have to accept that it will be an either/or situation? Thanks in advance.

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• Synergy on Linux and Linux

  - by archer

  Using Synergy-plus-1.3.4 on Gentoo Linux kernel 2.6.36-tuxonice-r3. Using SHIFT+CAPS to change keyboard layout on BOTH server and client boxes. Works perfectly if change layout using attached keyboard. But when using synergy keyboard (moved mouse from server screen to client and changing with SHIFT+CAPS) it has no effect. Synergy is just amazing thing exception this small issue which I'm assured is solvable. Please, gimme some hint.

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• Hardware, network infrastructure for runnng gaming server nd on VirtualGL

  - by archer

  Foud nice project VirtualGL (http://www.virtualgl.org/). Tried to run 3D fames (EVE Online, Prototype) on server and display the output on thin client using 100Mbps network. Server: Gentoo Linux on AMD Phoenom II x6 3.4Gz, 8GB RAM, 2x NVIDIA 9800 GTX in single session with display resulution 1024x768 on client. Performance is very promising. Going to increase network speed to 1Gbps (using either Ethernet or Fiber) and run 5-6 clients simultenously. My questions are: a) what would be better for network - 1Gbps Ethernet or Fiber (clients are distributed in max 20m around server)? Is that a must to use managed switch for better network performance? b) Should I increase number of video cards to put in SLI on server (going to use Gigabyte GA-890FXA-UD7 which has 6 PCIExpress slots [2 x4, 2 x8 and 2 x16]). Will it impact performance significantly. If I need to increase the number of video cards - what would be better - put 2 banks of video cards with 3 in bank using SLI, or 3 banks with 2 in the bank? Would linux recognize that and properly use all banks of video cards? c) any suggestions on good thin clients supporting 1920x1080 HDMI video and 1Gbps network I understand that my questions can't be answered clearly (unless someone already managed to use this kind of stuff ;)) although any suggestions would be very helpful.

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• Synergy on Linux and Linux

  - by archer

  Using Synergy-plus-1.3.4 on Gentoo Linux kernel 2.6.36-tuxonice-r3. Using SHIFT+CAPS to change keyboard layout on BOTH server and client boxes. Works perfectly if change layout using attached keyboard. But when using synergy keyboard (moved mouse from server screen to client and changing with SHIFT+CAPS) it has no effect. Synergy is just amazing thing exception this small issue which I'm assured is solvable. Please, gimme some hint.

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• What's the reason to break HDD to few partitions for MDADM+LVM2?

  - by archer

  I'm using 2 HDDs each 1TB in size. I'm going to create MDADM+LVM2 over them. Initially I though about this partition layout: /dev/sda1 - 1Gb (boot) /dev/sda2 - 500Gb (md0) /dev/sda3 - 499Gb (md1) /dev/sdb1 - 1Gb (boot) /dev/sdb2 - 500Gb (md0) /dev/sdb3 - 499Gb (md1) md0 is going to be raid0 and md1 is going to be raid1 however, I found some info that this would be better to break each drive to more partitions (lets say 10 partitions 100Gb in size each). What's the reason of doing that?

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• Using virtual functions

  - by Tucker Morgan

  I am starting to use virtual functions, and i am programming a simple text game, my question is this, if i have a virtual function called spec_abil with in a Super class called rpg_class. If you allow the player to class what class they want to play, say a mage class, a archer class, and a warrior class, which all have their own spec_abil function. How do you write it so that the program knows which one to use depending on the chosen class.

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• Serial Port Data Structure

  - by Seth Archer

  I need to send data to a hardware device over serial port. I'm using a program called serial port tool for os x. After I connect to the device there is a form box where I can type data to send. I have no idea how to format the data. Here is an excerpt from the manual for the device. "The Net Manager Command structure consists of one start byte, one command byte, five bytes of data, and a one byte checksum. Each message packet is formatted as follows:" an example command is: Byte0=30 Byte1=7 Byte2=5 Byte3=1 Byte4=2 Byte5=0 Byte6=245 How do I type that into the form box in serial port tool? Thanks, Seth

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• Linq to Xml to Datagridview

  - by David Archer

  Right, starting to go crazy here. I have the following code: var query = (from c in db.Descendants("Customer") select c.Elements()); dgvEditCusts.DataSource = query.ToList(); In this, db relates to an XDocument.Load call. How can I get the data into the DataGridView? Just thought I should mention: it returns a completely blank dgv

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• How to calculate Least Signficant Byte in Ruby

  - by Seth Archer

  I'm sending a byte array to a piece of hardware. The first 7 bytes contain data and the 8th byte is a checksum. The 8th byte is the Least Significant Byte of the sum of the first 7 bytes. Examples that include the correct checksum. The last byte of each of these is the checksum 200-30-7-5-1-2-0-245 42-0-0-1-176-0-148-39 42-0-0-3-177-0-201-118 How do I calculate the checksum? Thanks, Seth

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• Ruby SerialPorts Gem

  - by Seth Archer

  Using Ruby SerialPorts Gem to interact with hardware. When I write a byte array to the hardware using a program called "Serial Port Monitor" the hardware responds correctly. However, when I write the same byte array using ruby it doesn't work unless I do a read request just before the write request. This device doesn't respond correctly with this sp = SerialPort.new(args) sp.write [200.chr, 30.chr, 6.chr, 5.chr, 1.chr, 2.chr, 0.chr, 244.chr] But it does if I add a read request before the write. Like this sp SerialPort.new(args) sp.read sp.write [200.chr, 30.chr, 6.chr, 5.chr, 1.chr, 2.chr, 0.chr, 244.chr] This works, but I'm at a loss as to why. I should also add that the first snippet does work occasionally maybe 1/10 of the time.

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