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• Moving dozens of existing standalone retail sites to one central inventory database: what should I know going in?

  - by palintropos

  This will be the first project of this scale that I have attempted, and the first time I have run a website at all (much less dozens) using an off-site database. In particular, I'd like to know: what sort of optimizations I should read up on to make this run as smoothly as possible? any pitfalls/gotchas wiser, more experienced folk are aware of I should be on the lookout for, and what damage-control and preventative measures I should take against the nightmare scenario of the main server (hosting the database) having an outage, grinding over 100 websites to a halt (because they have no access to the product data).

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• How do I implement powerups for my Breakout clone?

  - by Eva

  I'm making a simple Breakout clone in Python that will have very many powerups/powerdowns (so far I came up with 26). Some will affect the paddle (paddle missile, two paddles, short paddle, etc.), some will affect the ball (slow ball, destructo-ball, invisible ball, etc.), some will affect the bricks (brick scramble, move up, bricks indestructible, etc.), and some will affect other game aspects (extra life, more points, less points, etc.). I'm pretty sure I have the code to draw the falling powerups and test for collisions with the paddle down, but I'm confused about how to code the effects of the powerups. Since there are very many powerups, it seemed inefficient to add specific methods to each component as done in this tutorial. However, I can't think of an other ways to implement the powerups. I found a page that hints at some way to design powerup behavior using classes, but I'm at a loss for how to do that. (A short example would help.) Please give me a short code example of another way to implement the effects of the powerups.

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• Is it normal for 12.04 to occupy almost 4GB?

  - by Grant

  I'm using a ASUS EeePC 901 and have some basic questions/issues. I installed 12.04 on the 4GB drive, selecting the option to erase it before doing so. Immediately after the installation I saw that Update Manager had over 100 updates pending. I attempted to install these, but was told that I had less than 100 MB remaining. Does the OS occupy all the other space? It seems that the best solution is to install 12.04 on the 16GB drive. Is this true? If I do this, what is the best way to erase the 4GB drive afterwards?

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• Ruby Installation System similar to NSIS (Nullsoft Scriptable Install System), feasibility?

  - by Chris Valentine

  I'm learning (relearning) how to use NSIS as I have not touched it in a bit. I also have recently become familiar with the Ruby language and find it very pleasing and actually a bit fun. And upon reading about the history of Rake I had a thought. What are the pros/cons of someone making (or migrating, or something) an installation system similar to NSIS in Ruby. It seems the learning curve would be far easier (NSIS seems so low level) and probably get the same job done in far less scripting. NSIS seems very outdated. Seems it would tie into things like Rake easier and Ocra and make Ruby distribution simpler for applications too. Maybe even give me a project to work on. Any thoughts on this?

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• What is the benefit of the "download will begin shortly" page?

  - by Fammy

  I've noticed many websites that host files for downloads have an interstitial page between the download link/button and the actual start of the download. Terminology on the page may include "Your download will begin shortly. If it does not, try this direct link". What is the purpose of this page? It seems to draw away from the general experience of downloading a file. Is this beneficial for bookmarking? Less experienced users? Analytics?

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• Is it normal for 12.04 to occupy almost 4GB? Also, related questions

  - by Grant

  I'm using a ASUS EeePC 901 and have some basic questions/issues. I installed 12.04 on the 4GB drive, selecting the option to erase it before doing so. Immediately after the installation I saw that Update Manager had over 100 updates pending. I attempted to install these, but was told that I had less than 100 MB remaining. Does the OS occupy all the other space? It seems that the best solution is to install 12.04 on the 16GB drive. Is this true? If I do this, what is the best way to erase the 4GB drive afterwards?

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• Gone in 60 Seconds: An Insecure Database is an Easy Target

  - by Troy Kitch

  According to the recent Verizon Data Breach Investigations Report, 98% of breached data originates from database servers and nearly half are compromised in less than a minute! Almost all victims are not even aware of a breach until a third party notifies them and nearly all breaches could have been avoided through the use of basic controls. Join us for this November 28th webcast to learn more about the evolving threats to databases that have resulted in over 1 billion stolen records. Also, hear how organizations can mitigate risks by adopting a defense-in-depth strategy that focuses on basic controls to secure data at the source - the database. There's no turning back the clock on stolen data, but you can put in place controls to ensure your organization won't be the next headline. Note, this webcast will be recorded for on-demand access after November 28th. 

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• Can GJK be used with the same "direction finding method" every time?

  - by the_Seppi

  In my deliberations on GJK (after watching http://mollyrocket.com/849) I came up with the idea that it ins not neccessary to use different methods for getting the new direction in the doSimplex function. E.g. if the point A is closest to the origin, the video author uses the negative position vector AO as the direction in which the next point is searched. If an edge (with A as an endpoint) is closest, he creates a normal vector to this edge, lying in the plane the edge and AO form. If a face is the feature closest to the origin, he uses even another method (which I can't recite from memory right now) However, while thinking about the implementation of GJK in my current came, I noticed that the negative direction vector of the newest simplex point would always make a good direction vector. Of course, the next vertex found by the support function could form a simplex that less likely encases the origin, but I assume it would still work. Since I'm currently experiencing problems with my (yet unfinished) implementation, I wanted to ask whether this method of forming the direction vector is usable or not.

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• Can I use metro style interface in my own web application?

  - by LukeP

  I am wondering if I would need to license the Metro style or if I can just freely use it in my own applications. I mean, is it patented or protected in any way that would prevent me from building my own implementation? I effectively would like to copy the visible part of it. I like to idea of being able to: Provide an interface which is used somewhere else (as in 1 less to learn) Use the interface that has been tested for usability (I personally like it) Have the possibility of getting free publicity because of implementing full Metro style web application while not associated with Microsoft, etc.

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• Is it worth becoming a programmer?

  - by D. Higueras

  Hi everybody. I'm a first year student in CS and I absolutely love programming. Many people have told me it isn't so good once you start working. Some things like bringing your work home(thinking about how to solve problems), working many hours when the timeline reaches an end an so on. I've heard being a system administrator is a lot less stressing job, since you don't have to worry about it at home. So my questions are(for experienced programmers): Is it worth becoming a programmer? Does your job satisfy you enough to overcome these problems? Thanks in advance.

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• What would you call the concept of CofeeScript or Sass to be?

  - by MaG3Stican

  There is this rising trend with web development of making new pseudo languages to extend the functionality of JavaScript, CSS and HTML given that those are static and their metamorphosis or evolution is painfully slow due to the variety of browser providers. So I am currently having a concept dilema on how to categorize them for a book I was made to write by my employer as no one seems to have a name for these pseudo languages. A tiny list of them : JavaScript: LiveScript, Metalua, Uberscript, EmberScript. HTML: Razor, Java Scriptlets. CSS : LESS, Sass. I believe the concept of these pseudo languages and a language or an extension of a language is quite different. First these languages do not extend any functionality currently existing on HTML or CSS or JavaScript, they simply work around it. And also they do not "compile" to an intermediate language, they are merely 1-1 translated to something that only then can be compiled. What would you call them?

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• Why does Linq to Entity Sum return null when the list is empty?

  - by Hannele

  There are quite a few questions on Stack Overflow about the Linq to Entity / Linq to SQL Sum extension method, about how it returns null when the result set is empty: 1, 2, 3, 4, 5, 6, 7, and many more, as well as a blog post discussing the issue here. Now, I could go a flag these as duplicates, but I feel it is still an inconsistency in the Linq implementation. I am assuming at this point that it is not a bug, but is more or less working as designed. I understand that there are workarounds (for example, casting the field to a nullable type, so you can coalesce with ??), and I also understand that for the underlying SQL, a NULL result is expected for an empty list. But because the result of the Sum extension for nullable types is also not nullable, why would the Linq to SQL / Linq to Entity Sum have been designed to behave this way?

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• Examples of "hidden" humor in programming books? [closed]

  - by Maglob

  Every now and then while reading programming books, I find more a less hidden jokes, passage of texts written in witty, tongue-in-cheek fashion, right there in middle of more serious text. These make me giggle and I remember these for years :) Such as The Java Programming Language, documentation about currentTimeMillis(): "The time is returned in a long, so it will not overflow until the year 292280995, which should suffice for most purposes. More sophisticated applications may require the Date class." Common Lisp The Language, 2nd ed, in index: "kludges, 1-971" What good "hidden" jokes you have come across while reading programming books?

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• Looking for parallel programming problem

  - by Chris Lieb

  I am trying to come up with a problem that is easily solvable in a parallel manner and that requires communication between threads for a test. I also am trying to avoid problems that require require random waits, which rules out dining philosophers and producer-consumer (bounded buffer), two of the classics. My goal is for the student to be able to write the program in less than 20-30 minutes in front of a computer not knowing of the problem beforehand. (This is to prevent preparation more than to come up with something novel.) I am trying to stress the communication aspect of the program, though the multi-threaded nature is also important. Does anyone have some ideas? Edit: I'm using Google Go for the language and testing comprehension of the goroutines/channels combo vs an actors library that I authored.

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• Is there a formal name for gradually initiating software changes?

  - by g .

  At times when we develop new features or functionality, we gradually "turn it on" to ensure a smooth transition and minimal impact for users. Instead of one big sudden change, we are able to control with the configuration aspects of the functionality that make it more or less intrusive to the user. This is all done in the same release/version of the software, so no software development changes are required (unless bugs turn up that need to be fixed). For example, initially we may only perform logging or analysis of data without acting upon it. Or we make something optional for a period of time before it becomes compulsory. The idea is that this reduces the potential for problems either on the technical side as well as unexpected changes by the user. The question is, is there a formal name for this approach?

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• Is there ongoing work in the kernel team to improve battery life under linux?

  - by leousa

  I have read in some forums that the kernel team is working on improving battery life and energy efficiency in linux. Unfortunately our community really lags behind windows and mac in that regard. I would like to read about the reasons why this difference exists with other platforms. Is it purely due to closed hardware specs from vendors or does it has to be with kernel design issues? Apple devices with unix cores have amazing battery times, but they also design their own hardware...just want to understand this issues in a less technical way I know that recent kernel updates in Ubuntu have improved the battery life in most computers, but I was wondering if there is still development going on and where can I read more about it. Thanks in advance

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• ubuntu is becoming more unstable

  - by Michael Hennessey

  I find ubuntu extremely unstable with mouse freezes (that can be corrected with control key), constant Compiz crashes ( with ATI non proprietary drivers also), problems installing drivers ( why would I want a video driver that fails to play most games, with loss of function of so many games (BZ flag?? has been around for years with no problems). I get the feeling that there is so one in your dept who is intentionally making poor and unstable choices for less than altruistic reasons. Whatever happened has been worsening ever since Unity became a choice. I have tried Kubuntu, Mint, Lubuntu and several other variants with similar poor results. Be aware I have used Ubuntu for many years.

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• Advantages of country TLD vs. .com

  - by Tschareck

  I want to get a domain for my site. The site's topic would be about Vienna, but the content will be in English. I was thinking, if I should get .com domain or .at domain. .at is both much cheaper and easier to get (there is less chance that my desired phrase is already registered). Is there any disadvantage in terms of SEO and page rank, if my domain does not end with .com? The site will be in English and targeted not just for Austria, but globally, mostly foreign tourists. I don't care if it's easy to remember the address, I expect most traffic to be from search engines anyway.

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• Why does Evolution give me multiple reminders for the same event?

  - by Dylan McCall

  I have a bunch of calendars on my Google Calendar account (school & work, personal, etc.), so I have Evolution subscribed to each one of those calendars. When I get a notification for an upcoming (recurring) event, I actually get many notifications for the same event, all at the same time. For example, just now I got 21 notifications for one event. I am using Gnome Shell, where the message tray displays event notifications in its own way. I get the same behaviour on my other computer, also running Ubuntu 11.10 with Gnome Shell. (And it has happened running Unity where Evolution only shows its dialog window with event reminders, but I'm not sure if it has happened quite as intensely). Does someone know why this is happening, and maybe how to fix it? It would be cool to get slightly less panic-inducing event reminders :)

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• Beginner's steps to game programming [on hold]

  - by CodeTrasher

  I have graduated from university less than 6 months ago and became a B.Eng in Software Engineering. I have moderate understanding of programming experience from languages like C++, Java and C#. But mostly on simple desktop and mobile applications. I've tried some simple Pong-like games but never finished even the smallest game. I have a couple of nice ideas growing (IMO, at least...) in my mind but don't really know where to begin. 2D is way to go, of course, at the beginning. I just want to hear from more experienced game devs how they started out. Should I make a rough outline of the core idea and mechanics and start working on a prototype of core gameplay? Or should I just practice more by making Pong, Asteroids and that sort of games and get an understanding of those before moving on? Thanks to all!

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• What are good HTML 5 and PHP 5 books to get? [closed]

  - by lardtard

  I am looking for beginner books into PHP 5 (Maybe with a bit into MySQL?) and HTML 5. I started self-teaching myself PHP although it has become a problem as the tutorials online are either outdated or just crap. I also managed to start learning with very little HTML knowledge so I am looking to brush up on my HTML knowledge and get more into PHP. I also am unsure weather I should be looking into XHTML or HTML5, or both so an answer to that would be splendid. I just want to become more self-sufficient and less reliant on other for my programming needs. I've searched Google for books but I'm just not sure which one is the "best" for me and makes for good practice and habits which brings me here.

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• Les Variables de plus en plus proches du CSS, WebKit commence à les supporter de manière expérimentale

  Les Variables de plus en plus proches du CSS WebKit commence à les supporter de manière expérimentale L'équipe de WebKit, le moteur de rendu utilisé entre autres par Chrome et Safari, va supporter de manière expérimentale une des avancées les plus attendues (et fondamentales ?) du CSS : les variables. Jusqu'ici, seules des alternatives (comme less.js) permettaient d'utiliser ces variables dans des feuilles de style. Problème, ces « tours de passe-passe » demandent une phase de compilation. La solution du W3C, qui sera donc très prochainement supportée par le build Canary de Chrome et plus largement par les Nightly Builds de Webkit, est beaucoup plus simple.

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• As a programmer, are you required to do timesheets?

  - by vcsjones

  Timesheets are something that I've never been fond of, but non-the-less something that is a requirement within my company. They don't bother me so much, but they seem to really grind some other people's gears. I suppose I have a few questions, and feedback would be great. Are you required to do timesheets, assuming you aren't a contractor? (That is understandable to me). What is the granularity of timesheets that you would be comfortable with or that you use? (ex: all entries must be under two hours). Would timesheets ever factor into your reasons for not accepting a job or leaving a current one? How has management within your organization justified timesheets if you aren't billing to a client?

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• Getting collision detection in Pygames

  - by user36010

  I am writing a game in Pygame, I want to get collision detection. The aim is when a object hits another, the target object disappears. I want to avoid having classes and just have my code class less for now, in one script. This makes it difficult to get collision detection because the Rect method in Pygame is called on by an object(class). The logic I want to achieve is: object hits a target object target object disappears. is there an easy way to achieve this?(with minimal code possible)

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• Ubuntu on low powered laptop

  - by zkent

  First off, I am new to Ubuntu. I come from a Windows background (DOS before that) and am loving it so far. I installed it on an older Dell laptop that I wanted to get another year out of. I set this machine up primarily as a LAMP development machine for a project I am working on. The machine is a Vostro 1500 and it has 4GB RAM (maxed) and an upgraded hard drive. I can't watch YouTube videos for long before it starts to overheat and start acting sporadic. I can live without YouTube but every so often the application switching (alt-tab) gets slower and begins not showing all applications and the Dash home quits displaying properly. I am sure I am asking a lot of this old machine. What I really want to know is: are there any settings in Ubuntu that allow me to lower the graphic effects (fade-ins, transparencies, fancy transitions, etc) that would be less taxing on the video card?

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