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  • Manual bootstrapping with Juju on VPS

    - by aaronfc
    I recently bought a VPS (OpenVZ) with Ubuntu 13.04. Lately I've read about Juju and I thought it would match my needs on my brand new VPS as I want to easily configure Hadoop, Wordpress, Graphite and other services. I tried the juju-local approach but I got an error while installing it: http://paste.ubuntu.com/6373143/ So I got to #juju IRC channel and I was told to use "Manual bootstrapping" and create a question here in order to get more info as it seems is something under development. Could anybody help me getting Juju to work on my VPS? Did any had the same problem? Thanks in advance! EDIT: After some more research (and after reading my own question) I think I should clarify a little more the situation. What I want is a manual provider to allow me manage my VPS from Juju. I know there might be a work in progress and I would appreciate any info regarding it's state and any possible solution :)

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  • Liskov principle: violation by type-hinting

    - by Elias Van Ootegem
    According to the Liskov principle, a construction like the one below is invalid, as it strengthens a pre-condition. I know the example is pointless/nonsense, but when I last asked a question like this, and used a more elaborate code sample, it seemed to distract people too much from the actual question. //Data models abstract class Argument { protected $value = null; public function getValue() { return $this->value; } abstract public function setValue($val); } class Numeric extends Argument { public function setValue($val) { $this->value = $val + 0;//coerce to number return $this; } } //used here: abstract class Output { public function printValue(Argument $arg) { echo $this->format($arg); return $this; } abstract public function format(Argument $arg); } class OutputNumeric extends Output { public function format(Numeric $arg)//<-- VIOLATION! { $format = is_float($arg->getValue()) ? '%.3f' : '%d'; return sprintf($format, $arg->getValue()); } } My question is this: Why would this kind of "violation" be considered harmful? So much so that some languages, like the one I used in this example (PHP), don't even allow this? I'm not allowed to strengthen the type-hint of an abstract method but, by overriding the printValue method, I am allowed to write: class OutputNumeric extends Output { final public function printValue(Numeric $arg) { echo $this->format($arg); } public function format(Argument $arg) { $format = is_float($arg->getValue()) ? '%.3f' : '%d'; return sprintf($format, $arg->getValue()); } } But this would imply repeating myself for each and every child of Output, and makes my objects harder to reuse. I understand why the Liskov principle exists, don't get me wrong, but I find it somewhat difficult to fathom why the signature of an abstract method in an abstract class has to be adhered to so much stricter than a non-abstract method. Could someone explain to me why I'm not allowed to hind at a child class, in a child class? The way I see it, the child class OutputNumeric is a specific use-case of Output, and thus might need a specific instance of Argument, namely Numeric. Is it really so wrong of me to write code like this?

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  • Using Substring() in XML FLOWR Queries

    - by Jonathan Kehayias
    Tonight I was monitoring the #sqlhelp hashtag on Twitter for a response to a question I asked when Randy Knight ( Twitter ) asked a question about using SUBSTRING in FLOWR statements with XML. #sqlhelp Is there a way to do a SQL Type "LIKE" or "SUBSTRING" in the where clause of FLWOR statement? Need to evaluate just first n chars. By the time I posted a response, Randy had figured out how to use the contains() function to solve his problem, but I am going to blog this because...(read more)

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  • Already have Merchant Account, what info will my Gateway need?

    - by Anonymous Coward
    I have a client who already has a merchant account for their physical store. What specific information about the merchant account will my client need to get from his bank to link it up to an online payment gateway that we will be using for the store? -----edits below -"my merchant account" changed to "the merchant account" -It is noted that my client will need to get a "high-risk" merchant account separate from his existing physical stores merchant account. -Though the question is essentially answered, for clarification: We plan to minimize our PCI compliance needs by utilizing something like Braintree's Transparent Redirect or the CRESecure iForm. So the gateway we would need to give the merchant account info to would be either of those two. Though, the CRESecure method would have yet one more step added into the mix since they would forward data to another payment provider. It is now assumed that the best place to field this question is to the support team at Braintree or CRESecure.

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  • How to list user installed applications (not packages)?

    - by Bucic
    Not packages and not all applications. Just the applications user installed by himself from whatever source (Software Center, manually added PPA, etc.). If the above is not possible - a list of all installed applications or at least a GUI which lists the applications so I can take screenshots of it. I've read a dozen of similar questions and people posting answers usually don't even get close to OP question merit. Please note that my question includes 'user installed'. Answer: It is not currently possible in Ubuntu Linux. (choosing tijybba's answer as the closest one though)

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  • When can I be sure a directed graph is acyclic?

    - by Daniel Scocco
    The definition for directed acyclic graph is this: "there is no way to start at some vertex v and follow a sequence of edges that eventually loops back to v again." So far so good, but I am trying to find some premises that will be simpler to test and that will also guarantee the graph is acyclic. I came up with those premises, but they are pretty basic so I am sure other people figured it out in the past (or they are incorrect). The problem is I couldn't find anything related on books/online, hence why I decided to post this question. Premise 1: If all vertices of the graph have an incoming edge, then the graph can't be acyclic. Is this correct? Premise 2: Assume the graph in question does have one vertex with no incoming edges. In this case, in order to have a cycle, at least one of the other vertices would need to have two or more incoming edges. Is this correct?

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  • Learning Asynchronous programming

    - by xenoterracide
    Asynchronous non-blocking event driven programming seems to be all the rage. I have a basic conceptual understanding of what this all means. However what I'm not sure is when and where my code can benefit from being asynchronous, or how to make blocking IO, non-blocking. I'm sure that I can simply use a library to do this, but I'm more interested in more in depth concepts, and the various ways to implement it myself. Are there any comprehensive/definitive books, or other resources on this subject (like GoF for Design Patterns, or K&R for C, tldp for things like bash)? (Note: I'm not sure if this is actually functionally an identical question to my question on Learning event driven programming)

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  • Transformation matrix that maps a window

    - by gbhall
    I'm currently learning OpenGL at uni, and they give us questions to help us learn (these are not worth anything), however I'm stuck on this one question and would have to travel over an hour and a half to uni for an answer. How do I do this question? Please include as many steps as you can, I want to be able to follow exactly how to do this. Find the transformation that maps a window whose lower left corner is at (1,1) and upper right corner is at (3,5) onto: The entire device screen whose dimension is (600, 500) A viewport that has lower left corner at (100,100) and upper right corner at (400,400) Edit: Damn sorry I should have added I am meant to find the matrix, so no code.

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  • Which hosted chat solutions offer the following?

    - by David
    I am looking for a chat room solution similar to the one on StackExchange to facilitate more responsive communication between the contributors on Open-Org.com. My criteria are the following: No Flash (this rules out more than half) Full history (meaning that it is possible to access all previous conversation for future reference. Very customizable No ugly IRC stuff filling up the chat view (I do not want to see who joined an who left etc.) No private conversations possible (this is just not in the spirit of Open-org.com) A hosted solution with a reasonable price. These criteria are so different from this question, so this is not a duplicate question. The service which matches this the closest is Chatroll.com. However, at 199$ per month their prices are outrageous.

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  • What is the logic behind Ubuntu's messy installation process?

    - by Swaahaa
    Before you get into the conclusion that I want to " DISCUSS " this question, I would like stop you with whole respect and state that- I want A Clear Cut Answer for this question. Ubuntu is such an awesome Operating System. Why do the user dread with fear before installing each and every application. I mean why not a platform in Ubuntu which JUST INSTALLS ANYTHING. I am happy when after a lot of SUDOS, TERMINALS and this and that I INSTALL something. But what is the logic behind such a mess.

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  • Handling different screen densities in Android Devices?

    - by DevilWithin
    Well, i know there are plenty of different-sized screens in devices that run Android. The SDK I code with deploys to all major desktop platforms and android. I am aware i must have special cares to handle the different screen sizes and densities, but i just had an idea that would work in theory, and my question is exactly about that method, How could it FAIL ? So, what I do is to have an ortho camera of the same size for all devices, with possible tweaks, but anyway that would grant the proper positioning of all elements in all devices, right? We can assume everything is drawn in OpenGLES and input handling is converted to the proper camera coordinates. If you need me to improve the question, please tell me.

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  • Best URL for cars related website? [duplicate]

    - by Claudio ??is Mulas
    This question already has an answer here: What is the best stucture of SEO friendly URL? 3 answers If this was your website, what will be the URLs for each car on sale? http://www.autoscout24.eu/Details.aspx?id=247572735&asrc=ha I'm working on a car dealership website. What should be the best URL? Consider also that the company can have more models of the same car. I'm not asking for a url scheme, there are a lot of similar questions. My question is: in a car dealership website what is the best url for a car? What are by you the best variables I've to put on the url. Brand, model, year, location, color, miles/km, etc. This website, that url, this particulary case: what will you choose for urls? (even not in the following list) audi_q5_2009.html audi_q5_2009_used.html audi_q5_2009_used.html audi_q5_2009_used_in_alcobendas.html audi_q5_2009_used/247572735.html

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  • Licensing Theme Music from other games

    - by HS01
    As part of my game, I thought it would be fun to make a hidden level that pays tribute to Mario Bros (one of the earliest games I ever played). It would be themed in that way with 8-bit graphics and question mark blocks and completing the level would say "Thank you but the princess is in another castle" or such. For the sound track, I'm thinking of just overlaying the standard mario theme music by playing it on a virtual keyboard using a different instrument/timing or something. My question is, am I legally safe? I'm not using anyone else's actual music, I'm just playing the same tune in a different way myself. Do I have to get licensing for this?

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  • Can anyone recommend a chorded keyboard for a programmer?

    - by Tom Wright
    Pre-emptive strike: It's subjective, but it's also Friday... ;) Inspired by this great question and related to this great question, I have decided to buy a chorded keyboard. (A chorded keyboard, by the way, is one with a reduced number of keys, that must be pressed together, in chords, to give all the possible characters etc. - see wikipedia) Being a programmer means that the keys I use regularly are likely different to a regular Joe (a lot more semi-colons for a start), so I was wondering if any of my fellow programmers had tested a chorded keyboard for use on the battlefield of code? Being a nerd, I'm also interested in the extent to which I'd be able to customise my chorded keyboard. (Macros? Shortcuts?) Edit I'm beginning to suspect that no-one has heard of these, let alone tried one. So we're all talking about the same thing, here's an example: Twiddler 2.1

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  • Database IDs

    - by fatherjack
    Just a quick post, mainly to test out the new blog format but related to a question on the #sqlhelp hashtag. The question came from Justin Dearing (@zippy1981) as: So I take it database_id isn’t an ever incrementing value. #sqlhelp When a new database is created it is given the lowest available ID. This either is in a gap in IDs where a database has been dropped or the database ID is incremented by one from the highest current ID if there are no gaps to fill. To see this in action, connect to your sandbox server and try this: USE MASTER GO CREATE DATABASE cherry GO USE cherry GO SELECT DB_ID() GO CREATE DATABASE grape GO USE grape GO SELECT DB_ID() GO CREATE DATABASE melon GO USE melon GO SELECT DB_ID() GO USE MASTER GO DROP DATABASE grape GO CREATE DATABASE kiwi GO USE kiwi GO SELECT DB_ID() GO USE MASTER GO DROP DATABASE cherry DROP DATABASE melon DROP DATABASE kiwi You should get an incrementing series of database IDs as the databases are created until the last one where the new database gets allocated the ID that is missing because one was dropped.

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  • Why are so many questions closed? [closed]

    - by Kim Jong Woo
    Why is there so many questions on this stackexchange site closed? I mean far more than usual. Even very high quality discussions are closed. Doesn't this high number of closed questions with high number of views and good quality of content seem like that the current policy that governs the criteria for appropriate question might be going against nature? I mean it feels as if lot of questions or discussions are everything surrounding programmer, programming, and need not be objective or seeking definitive answer. It appears lot of questions are of inquisitive nature seeking insight into other programmers and finding common subjects of interest. Is it possible for mods to relax a bit? I mean lot of great questions with [closed] tag everywhere doesn't do justice. This question in itself is a perfect example of what I am talking about and it will be closed. But I think my point is clear.

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  • How to access network folders from within windows 7 virtualbox

    - by musher
    At work we have fileshare storages accessible via the network. I'm not super familiar with this kind of networking, so I'm not 100% sure how to word this question/give enough details right away so please ask for any clarifications. That being said: Host: Xubuntu 14.04 Guest: Windows 7 enterprise Via thunar I can access these network drives fine by going to Browse Network > Windows Network > Server I want to use The name given in the address bar is: smb://SERVER-NAME So my question now, is how do I go about accessing these folders via my win 7 machine in virtualbox? I've searched but all I get is people who can't figure out shared folders between host/guest (which I've got working)

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  • Help with creating bootable usb from iso

    - by Deus Deceit
    --All this is about terminal-- I know some of you will laugh, but I'm trying to install Arch Linux, since I want to learn as much as I can about linux system and how it works. I want to be an expert (maybe in 1000 years, but that's okay :)). The problem is that even tho I know how to do some stuff under linux I'm having a hard time with those names about hard drives, usb, cd, blah blah and how to access them. Big introduction and no question yet, but the purpose is for you to see where I'm standing and give me as many details as possible. And here's the question: How can I put the .iso file in a usb that will run on computers startup and allow me to install Arch linux? Details as to how to turn my pc on and hit F8 or whatever can be discarted lmao :) Ty in advance.

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  • Probelm with ATI catalyst drivers in ubuntu 13.10

    - by Raja
    Recently I've installed dual boot ubuntu 13.10 alongside windows 8. My Laptop is Dell Inspiron 15, with AMD Radeon HD 7670 Video Card. Without fglrx my battery is draining to 1:30 hrs from 3:30hrs (In Ubuntu 13.04 but very slow booting ) so I installed fglrx using What is the correct way to install ATI Catalyst Video Drivers (fglrx)? But the problem is as you all know, Black Screen after logging into ubuntu. Tried so many solutions for this like reinstalling unity , ubuntu-desktop , compizconfig , etc.. but none helped except removing fglrx* completely. (But I need them very badly due to battery) Assuming that all hope is lost., Posting here as a final try.! Will be highly greatfull for those who helped :) PS : For those who think this question is a duplicate., Though the question may be a duplicate, but the answer is not! (so give me a assured solution for this problem before flagging this as duplicate., Kindly understand my frustation) Thank You !

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  • How can I find a good open source project to join?

    - by Lord Torgamus
    I just started working a year ago, and I want to join an open source project for the same reasons as anyone else: help create something useful and develop my skills further. My problem is, I don't know how to find a project where I'll fit in. How can I find a beginner-friendly project? What attributes should I be searching for? What are warning signs that a project might not be the right fit? Are there any tools out there to help match people with open source projects? There's a similar question here, but that question has to do with employment and is limited to PHP/Drupal.

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  • What are approaches for analyzing the cost-benefits of a development methodology?

    - by Garrett Hall
    There are many development practices (TDD, continuous integration, cowboy-coding), principles (SOLID, layers of abstraction, KISS), and processes (RUP, Scrum, XP, Waterfall). I have learned you can't follow any of these blindly, but have to consider context and ROI (return on investment). My question is: How do you know whether you are getting a good ROI by following a particular methodology? Metrics, guesstimation, experience? Do analytical methods exist? Or is this just the million-dollar question in software engineering that has no answer?

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  • Unity Occlusion Portals: What and How?

    - by Nick Wiggill
    (Here I eat my words on Meta about posting Unity questions on Unity Answers... since that site is less responsive than this one.) Unity provides cell-based Occlusion Culling (via Umbra, I believe). However, a newer feature that it supports is Occlusion Portals. The question is, if BSP-based occlusion culling is already a feature of Unity, what do portals add, and how? PS. This question is not "What are portals?" -- I'm aware of the original Quake BSP-style portals -- which is partly why I find the explicit portal concept in Unity odd, since it uses BSP anyway.

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  • How to make a deb install only when the dependency is installed, or the conflicting packages aren't?

    - by adam
    I'm making a package for Cydia, but since it uses APT/dpkg, I thought I'd ask this question here. I want my package to only install if gsc.wildcat (represents an iPad) is installed, or if gsc.front-facing-camera (represents an iPhone 4/4S) is not installed. This setup would let the package only install on the 3GS or an iPad, but there's no package that represents a 3GS that I know of. It also requires iOS 5 (firmware (>= 5.0)). Here's an excerpt from my control file: Depends: gsc.wildcat, firmware (>= 5.0) Conflicts: gsc.front-facing-camera How can I do this with only Depends/Conflicts? (Please note that this question is about dpkg and not Cydia.)

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  • Is anyone doing "real" TDD with Visual-C++, and if yes, how do they do it?

    - by Martin
    Test Driven Development implies writing the test before the code and following a certain cycle: Write Test Check Test (run) Write Production Code Check Test (run) Clean up Production Code Check test (run) As far as I'm concerned, this is only possible if your development solution allows you to very quickly switch between the production and test code, and to execute the test for a certain production code part extremely quickly. Now, while there exist lots of Unit Testing Frameworks for C++ (I'm using Bost.Test atm.) it does seem that there doesn't really exist any decent (for native C++) Visual Studio (Plugin) solution that makes the TDD cycle bearable regardless of framework used. "Bearable" means that it's a one-click action to run a test for a certain cpp file without having to manually set up a separate testing project etc. "Bearable" also means that a simple test starts (linking!) and runs very quickly. So, what tools (plugins) and techniques are out there that make the TDD cycle possible for native C++ development with Visual Studio? Note: I'm fine with free or "commercial" tools. Please: No framework recommendations. (Unless the framework has a dedicated Visual Studio plugin and you want to recommend the plugin.) Edit Note: The answers so far have provided links on how to integrate a Unit Testing framework into Visual Studio. The resources more or less describe how to get the UT framework to compile and get your first Tests running. This is not what this question is about. I'm of the opinion that to really work productively, having the Unit Tests in a manually maintained(!), separate vcproj from your production classes will add so much overhead that TDD "isn't possible". As far as I am aware, you do not add extra "projects" to a Java or C# thing to enable Unit Tests and TDD, and for a good reason. This should be possible with C++ given the right tools, but it seems (this question is about) that there are very little tools for TDD/C++/VS. Googling around, I've found one tool, VisualAssert, that seems to aim in the right direction. However, afaiks, it doesn't seem to be in widespread use (compared to CppUnit, Boost.Test etc.). Edit: I would like to add a comment to the context for this question. I think it does a good summary of outlining (part of) the problem: (comment by Billy ONeal) Visual Studio does not use "build scripts" that are reasonably editable by the user. One project produces one binary. Moreover, Java has the property that Java never builds a complete binary -- the binary you build is just a ZIP of the class files. Therefore it's possible to compile separately then JAR together manually (using e.g. 7z). C++ and C# both actually link their binaries, so generally speaking you can't write a script like that. The closest you can get is to compile everything separately and then do two linkings (one for production, one for testing).

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  • Is it common to purchase an insurance policy for contract development work?

    - by Matthew Patrick Cashatt
    I am not sure if this is the best place for the question, but I am not sure where else to ask. Background I am a contract developer and have just been asked to provide a general liability policy for my next gig. In 6-7 years this has never been asked of me. Question Is this common? If so, can anyone recommend a good underwriter that focuses on what we do as contract software developers? I realize that Google could help me find underwriters but it won't give me unbiased public opinion about which companies actually understand what we do and factor that into the price of the policy. Thanks, Matt

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