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• What is testable code?

  - by Michael Freidgeim

  We are improving quality of code and trying to develop more unit tests. The question that developers asked  was  "How to make code testable ?"  From http://openmymind.net/2010/8/17/Write-testable-code-even-if-you-dont-write-tests/ First and foremost, its loosely coupled, taking advantage of dependency injection (and auto-wiring), composition and interface-programming. Testable code is also readable - meaning it leverages single responsibility principle and Liskov substitution principle.A few practical suggestions are listed in http://misko.hevery.com/code-reviewers-guide/More recommendations are in http://googletesting.blogspot.com/2008/08/by-miko-hevery-so-you-decided-to.htmlIt is slightly too theoretical - " the trick is translating these abstract concepts into concrete decisions in your code."

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• In what order do people build websites?

  - by Corey

  For a website, you need to have an idea, you need to have a design and you need to have data, events and output, right? Whether it be a blog, web app, Q&A site, search engine... Anyway, that is only slightly related to my question. My question is, when designing a website, providing I know the purpose, what should I start with? Should I start with the CSS, design and look&feel using dummy data first, or should I program in the logic, events and output, and style it later? What is the design process of most websites that are built from the ground up?

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• 12.10 starts up to just my desktop background [closed]

  - by Alex

  Possible Duplicate: Unity does not start after installing the fglrx drivers on 12.10 I have only just started using linux more than just instlling it on an old pc for fun and have just changed the driver settings from the default option. The computer starts up and goes through everything else well, but at slightly lower resolution. Once signing on to Ubuntu, it only displays my desktop background and cursor. Can i restore it to the default driver settings? I've spent a while transferring files and don't want to reinstall Ubuntu.

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• QotD: Eben Upton on Raspberry Pi Model B Shipping With 512MB of RAM

  - by $utils.escapeXML($entry.author)

  One of the most common suggestions we’ve heard since launch is that we should produce a more expensive “Model C” version of Raspberry Pi with extra RAM. This would be useful for people who want to use the Pi as a general-purpose computer, with multiple large applications running concurrently, and would enable some interesting embedded use cases (particularly using Java) which are slightly too heavyweight to fit comfortably in 256MB.The downside of this suggestion for us is that we’re very attached to $35 as our highest price point. With this in mind, we’re pleased to announce that from today all Model B Raspberry Pis will ship with 512MB of RAM as standard.Eben Upton, a founder and trustee of the Raspberry Pi foundation, in a blog post announcing the change.

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• How do I increase the touchpad sensitivity on Acer Aspire One 532h?

  - by Yossi Farjoun

  I got a cheap netbook and put ubuntu on it without even booting into the windows it came with. I am now slightly regretting it since the trackpad is very annoying, it only registers when I press quite hard on it, and even then the motion is so slow that I must drag me poor finger 3 times to get the pointer to move up or down that tiny screen. OK. enough rant. now business: I went into the setting and increase sensitivity and acceleration to high. No difference. the behaviour did not change at all. So now my questions are: Is this a hardware problem? Is there a program I can run to see what input the trackpad is receiving? so I know if it can, in theory, read the light touch and not only the heavy, sandpaper-your-fingertips-off touch? is there some manual setting that the system might not be setting correctly and which I could change from the terminal?

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• I've changed my URL schema. How do I tell Google to index the new schema and forget the old one?

  - by growse

  I had a site where the urls were constructed like this /index.php/Topic /index.php/AnotherTopic These were indexed in google, and search results returned that pointed to these. However, I've recently replatformed that site, and reconfigured it so the above urls would be: /index.php?title=Topic /index.php?title=AnotherTopic The original urls are returning 404s. The site is linking to the correct URL schema internally, but Google is retaining the original schema in its search results. I've updated and resubmitted the sitemap which only contains the new schema. Also, Google's webmasters tool is going slightly bananas at the fact there's now a spike in 404 errors in its crawl results. What would be the best approach to get Google to 'forget' about the old schema, and instead index the new schema? Should I try blocking /index.php/ in robots.txt? Should I be returning 301 codes instead of 404 for the original urls?

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• Disabling IPv6 on a single interface

  - by ijw

  I'm slightly weirded out by the fact that Ubuntu won't process ipv4 DHCP unless you explicitly tell it to, but will happily take ipv6 RAs unless you tell it not to. Is there any way to change the default behaviour to be 'do nothing unless I explicitly turn it on'? (Note to answerers: I'm not looking to globally disable ipv6, or completely turn off autoconf. I'm looking to disable autoconf by default (as in, I don't want ipv6 unless I say so in /etc/network/interfaces, in the same way that I don't just get a v4 address unless I've explicitly turned on dhcp). What's happening is that, for any interface that's up - e.g. has an ipv4 config - a v6 address tends to just turn up on the interface as well, despite the fact that I've not enabled that explicitly. The solutions to date are fine as far as they go, but if I disable v6 or autoconf globally, I can't then re-enable v6 on a per-interface basis with a simple command in /etc/network/interfaces. I'm fairly sure I'm asking for the moon on a stick, mind you.)

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• Need to produce an animated texture of Water where each image tiles in all directions

  - by ProfVersaggi

  I need to produce a 2D 'animated' texture of "water" for a game in which each image tiles in 'all' directions, much like those produced by the Caustics Generator, but with the power and flexibility of something the likes of Blender. The final result from Caustics Generator is 32 images that are actually animated such that when the full 32 images are played in a loop they will seamlessly loop forever. They will not only loop in time, but each image also tile in all directions. This is nice, but it comes in only one flavor so to speak. I'd like to accomplish the same thing with a Blender type tool, and I have actually gotten to the point where I generate the X number of images, but they do not tile in 'all' directions, nor are they slightly animated. I've tried Blender texture animations using offsets but with only limited success. Does anyone know of how to (or of a tool) which will animate textures such that they tile in all (4) directions? Many thanks in advance ....

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• Q&amp;A: Where does high performance computing fit with Windows Azure?

  - by Eric Nelson

  Answer I have been asked a couple of times this year about taking compute intensive operations to Windows Azure and/or High Performance Computing on Windows Azure. It is an interesting (if slightly niche) area. The good news is we have a great paper from David Chappell on HPC Server and Windows Azure integration. As a taster: A SOA application running entirely on Windows Azure runs its WCF services in Azure Worker nodes. Download now Related Links: Other Q&A posts on my team blog Don’t forget to connect with the UK team if you stumbled across this post by accident/bing/google

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• Change guest username

  - by Eelviny

  Now, looking around on Google shows me some ways in which to customise the settings of the Guest session. But, I would love a way to change the name of the Guest account. Basically, I'm planning to take some laptops out to a school in Africa and want to rename the "Guest" account in 14.04 to "Student" so the students use that. They tend to store stuff on USB sticks and they're using the Guest account so they can't break anything. EDIT: I'll expand on this slightly. They're using the guest account simply for the reason it doesn't save anything after logoff. This was a specific thing the teachers have asked for. I don't mind if the actual username remains guest behind the scenes, but as long as it shows up as Student to on Unity. Any way of going about this?

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• What is an effective way to organize tasks for a new project?

  - by Dulan

  Is there a practical solution to organizing the initial tasks for a new project? To elaborate, imagine the features/stories/goals are laid out for a project. How might one go about organizing those into sane tasks for the first few versions? The scenario I typically have in mind has the features listed as a high-level reference for what the end user-experience should involve. The tasks for constructing such features are then broken down into chunks (such as "create interface for X component"). Such a task is not necessarily "tied" to only that feature and may be useful when building subsequent features. Is breaking features down into small, code-able solutions valid? Or should they be slightly removed from any specific implementation? I do not expect that there is one "right" answer to this question, but I am looking for a fairly pragmatic and unobtrusive approach. As a note, I'm looking for solutions that are independent of any tools or "systems" used for managing the tasks themselves.

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• Is there a way to recover a file that I have deleted but is still open somewhere?

  - by George Edison

  This question is related to How to recover deleted files? but it is slightly different in nature. Suppose I have a file named ~/something open in a text editor. Further suppose that I open a terminal and run the following command while the file is still open in the text editor: rm ~/something This will delete the file. Now suppose that I changed my mind and wanted to get the file back. The file is still open in the text editor, so it hasn't been removed from the disk or filesystem yet. Is there any way to recover it?

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• HP Pavilion G6 1209 temperature higher than usual and fan working in 11.10

  - by vanjadjurdjevic

  Installing Ubuntu on this new machine i had various problems, so I asked around ask ubuntu for a solution. This is the latest one! :D When I start the pc it shows the temperature around 50-55. When I open chromium it shows 60+ (61,62,63). It even gets to 67-68 when multi-tasking 2 apps. The fan is working slightly louder than in windows 7. Talking about windows 7, the temperature is 45-50 when idle, 50-53 when working in browser. Im already loosing it with this machine. You can find specs here It says 'technishe daten' below the picture. Click that tab and you will reach the specs.

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• Problem with NVIDIA G86 on Kubuntu 12.04

  - by Stefan

  I got problems some weeks ago with my NVIDIA G86 (8500 GT), supposedly due to the infamous 295.40 version of the driver. I got errror messges like NVRM: RmInitAdpterFailed. Tried varous sugestions about setting kernel acpi and memory options, but no luck. I pulled in x-swat and got 302.17, if I remember correctly. It did not help. People recommended xorg-edgers , so I pulled that in and got kernel 3.5.0.12 and nvidia 304.43 but the problem remained. Getting slightly panicked, I tried to back back to vanilla 12.04, so I purged nvidia* and located and removed anything on the system that smelled nvidia. I installed nouveau, cause people said it was great, but as it turns out, my card does not seem to be supported. :-( Sigh... So now I fear that I have atmessed up system, and graphics is terrible. Any help would be appreciated. Xorg.0.log: http://paste.ubuntu.com/1189616/ kern.log: http://paste.ubuntu.com/1189634/

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• When failure is a feature

  Warning: this post is going to be slightly off-topic and non-technical. Well, not computer science technical at least. I was reading an article in SciAm this morning about the possibility of a robot uprising. Dont laugh yet, this is a very real, if still quite remote possibility. The main idea that was described was that AI could rise one day to self-awareness and to an ability to improve itself through self-replication beyond human abilities to control it. Sure, thats one possibility, and some...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• Alternatives to JS in the browser: your experience [closed]

  - by Andrea

  In these days there are many projects whose aim is to bring new languages to the browser by compiling them to JavaScript. Among the others one can mention ClojureScript, CoffeScript, Dart, haXe, Emscripten, Amber Smalltalk. I understand that in part the response to this answer depends on the particular project. But, anyway: Have you tried any of them? Are these tentatives suitable for production sites? Should I want to try one of those, what are the downsides I should carefully evaluate? By the way, I expect the answer to be slightly misleading for CoffeeScript, since its semantics is very close to that of JavaScript, so I guess it should be easier to make it work seamlessly with the existing JavaScript ecosystem.

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• which way should I look at visits by region in Google Analytics?

  - by Drai

  I need to generate a report for only the Americas in Google Analytics. When I create an advanced segment that includes Continent Exactly Matching Americas I get one number, If I create the segment that includes sub-Continent region Includes America I get a slightly different number, And if I look at all visits but choose Demographicslocationand segment by sub-continent region I get yet a 3rd number! (Note: this is because it also includes Caribbean) All are only different by around 1% of traffic. What is the most accurate way to do this, or should I just pick a way and be consistent?

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• Can I use the test suite from an open source project to verify that my own 'compatible library' is compatible?

  - by Mark Booth

  The question Is it illegal to rewrite every line of an open source project in a slightly different way, and use it in a closed source project? makes me wonder what would be considered a clean-room implementation in the era of open source projects. Hypothetically, if I were to develop a library which duplicates the publicly documented interface of an open-source library, without ever looking at the source code for that library, could that code ever be considered a derivative work? Obviously it would need the same class hierarchy and method signatures, so that it could be a drop-in replacement - could that in itself, be enough to provoke a copyright claim? What about if I used the test suite of the open source project to verify whether my clean implementation behaved in the same way as the original library? Would using the test suite be enough to dirty my clean code? As should be expected from a question like this, I am not looking for specific legal advice, but looking to document experiences people may have had with this sort of issue.

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• Wireless/Bluetooth problems on t43p

  - by user75965

  I have been struggling to get my wireless mini pcmcia card recognised by 12.04. It suddenly stopped, mid session. I have taken it out and replaced with a couple of spares with slightly different serial numbers. One had no joy - 'unauathorised'. The other worked briefly for thunderbird but not firefox, it seemed. The network controller reads like this: 0b:02.0 Network controller: Intel Corporation PRO/Wireless 2200BG [Calexico2] Network Connection (rev 05) I have ordered a replacement from ebay, and hope I got the right one - used the the FRU number from the one that stopped working. But I have ALWAYS had no joy with my Thinkpad t43p Bluetooth and Ubuntu ( 12.04, and even 11.04 and 11.10, if I remember rightly). Do you think the Bluetooth problem will solve with a new mini pcmcia? Surely not, as it has never worked, whereas Wireless worked until a couple of weeks ago...

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• SEO Impact of using Responsive Design and the serving of different content on the same URL

  - by bmenekl

  We are currently working on redesigning our site and making it responsive. It is a search intensive site with complex functionality, a lot of search filters and a lot of content. Our mobile versions of certain pages need to hide some functionality (i.e. search filters) that exists in the desktop version and/or content (mainly blocks of text that are not necessary or are increasing page load in mobile devices). My questions is this: does the situation of having the same URL (responsive site) serving slightly different content (text and/or search filters) for certain pages in different devices affect our SEO (SERPs or otherwise)?

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• Using NPM to share resources between UI projects [on hold]

  - by guy mograbi

  I am a UI team leader. My team has a lot of projects using different languages/technologies. In some parts we will rewrite (gradually - @Ampt this is for you) the application in order to enable new fresh technologies in and get old dinosaurs out. I am going to use Node Package Manager to set up an "all powerful" build/dependency manager. Can I use NPM to depend on a private github repository? Can I use NPM to depend on SVN? Will NPM play nice with quickbuild? Since each project might have a slightly different structure (think jetty/maven or play!framework) can I configure NPM to install some dependencies in different folders while still running it from the project's root? How can I, using NPM, get development resources out and build a packaged product? (like a war) Yes/No - is there a reason to use grunt? No discussion, just one liners.

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• Should HTTP Verbs Be Used Semantically?

  - by Xophmeister

  If I'm making a web application which integrates with a server-side backend, would it be considered best practice to use HTTP methods semantically? That is, for example, if I'm fetching data (e.g., to populate a menu, etc.), I would use GET, but to update data (e.g., save a record), I would use POST. (I realise there are other methods that may be even more appropriate, but we need to consider browser support.) I can see the benefits of this in the sense that it's effectively a RESTful API, but at a slightly increased development cost. In my previous projects, I've POST'd everything: Is it worth switching to a RESTful mindset simply for the sake of best practice?

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• How do global cancel/exit commands work in bash?

  - by SecurityGate

  As I have done multiple times before, I've written bash scripts, and just general commands that go nowhere. They just blink the little command line cursor at me for infinity until I control+C the command. When I do cancel the command, what exactly is going on when I do this? Am I somehow stopping and killing the current PID I'm working on? Does it jump to a different run-level and execute something to terminate the command? On a slightly different note, I've never been able to figure out how to set up something like this in a script or program I've worked on. Since I mostly program in Ruby, can I setup something like a certain key press stops the program? Every time I've looked into doing something similar, I always end up getting hung up when it comes to user input, whether that is a loop waiting for a condition, or something like this: def Break() user_break = gets.strip end def Main() Function1() Break() Function2() Break() [...] end It seems and is incredibly bulky, and definitely isn't easily scaled up or down.

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• Forwarding data between two interfaces

  - by user84471

  I installed Ubuntu server 12.04 after that I installed dhcp3-server and configured it like this: At isc-dhcp-server INTERFACES="eth0" And in dhcpd.conf # A slightly different configuration for an internal subnet. subnet 192.168.1.0 netmask 255.255.255.0 { range 192.168.1.5 192.168.1.100; option domain-name-servers 192.168.1.1; option domain-name "nazwa.local"; option routers 192.168.1.1; option broadcast-address 192.168.1.255; default-lease-time 600; max-lease-time 7200; } Also I have two eth interfaces: # second netowrk interface auto eth0 iface eth0 inet static address 192.168.1.1 netmask 255.255.255.0 # The primary network interface auto eth1 iface eth1 inet dhcp When I plug computer to eth0 I get propertly ip adress but I can't visit any sites. I do even this: echo 1 > /proc/sys/net/ipv4/ip_forward

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• Bitmap rotation jitter around pivot

  - by Manderin87

  I am working on a asteriods clone and I have the ship graphic loaded as a 96x96 bitmap. When the player rotates the ship I rotate the bitmap by degree (float). rotation function: if(m_Matrix == null) { m_Matrix = new Matrix(); } else { m_Matrix.reset(); } m_Matrix.setRotate(degree, m_BaseImage.getWidth() / 2, m_BaseImage.getHeight() / 2); m_RotatedImage = Bitmap.createBitmap(m_BaseImage, 0, 0, m_BaseImage.getWidth(), m_BaseImage.getHeight(), m_Matrix, true); draw function: m_Paint.setAntiAlias(true); m_Paint.setFilterBitmap(true); m_Paint.setDither(true); canvas.drawBitmap(m_RotatedImage, (int) posX - m_RotatedImage.getWidth() / 2, (int) posY - m_RotatedImage.getHeight() / 2, m_Paint); When the bitmap is drawn, the bitmap jitters slightly around the pivot. Can anyone fix or tell me why the bitmap is jittering around the pivot? It needs to be smooth.

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