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• How to Implement a Parallel Workflow

  - by Paul

  I'm trying to implement a parallel split task using a workflow system. I'm using .NET but my process is very simple and I don't want to use WF or anything heavy like that. I've tried using Stateless. So far is was easy to set up and run, but I may be using the wrong tool for the job because I'm not sure how you're supposed to model parallel split workflows, where you have multiple sub-tasks required before you can advance to the next state, but the steps don't require being performed in any particular order. I can easily use the dynamic configuration options to check my data model manually to see if the model is in the correct state (all sub-tasks completed) and can transition to the next state, but this seems to completely break the workflow paradigm. What is the proper, orthodox way to implement a parallel split process? Thanks

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• TestDrive equivalent for Ubuntu Server

  - by Marius Gedminas

  Every now and then I'd like to play with a fresh minimal install of Ubuntu (to test sysadminish scripts, application install instructions, package dependency lists etc.). I'd like to have a tool as simple to use as testdrive: pick a version (say, 'maverick'), run a command, get a shell in a new virtual machine. I'd like that shell to be in the current terminal, rather than a new GUI window that testdrive uses. Setting up the new VM to accept SSH logins with my ssh public key is fine. I'd like the VM to have network access out of the box; NAT to a virtual network interface is fine. Why a VM? Chroots don't really cut it: installing, say, Apache in a chroot would fail because it would try to listen on port 80, which is already taken. Containers might work, though, if there are any that are supported by standard Ubuntu kernels.

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• distribution update made my close/minimize/maximize window buttons diappear

  - by Marc Sauvageau

  I am running an ubuntu/gnome3 environment. While running the upgrade manager on 12.04, I was informed that there was a distribution update but that it was partial. (whatever that means) After a few failed attempts at updating through the manager, I decide to run sudo apt-get update && sudo apt-get update. The updates seem to work however, the close/maximize/minimize buttons of all windows have disappeared. I also can no longer use the Alt+Tab function. I tried to post an image but I need more rep (sorry) I have tried to run the updates again but nothing changes. I'm still very new at this. I would appreciate it if you could use simple terms to describe or ask questions. Thanks in advance!

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• PHP API to trade products from eshop through REST/xml

  - by Donatas Veikutis

  I need algorithm, or PHP api example, or existing decision how to make system for trade big information for B2B xml with goods information. Now I try to use Slim framework to do that system. But for me need some documentation what architecture have to be in here. System requiments is simple: User have autentification username and password Then he can see which product groups assigned to it Then he can see all product with information (price, title, description, images, specifications etc.). Its will the easiest way to get a free php api for that I think, and try too edit some code. But I did not found anything.

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• Server side random selection of players

  - by Ron

  Assuming I have a simple client-server game, where the server picks random players on a very frequent base, I was wondering what is the best way to select a random player (According to the following constraints): Solution must be high performance and highly scalable Random spread should be relatively even (meaning if I have 3 players and pick 99 times, they will all be picked 33 times more or less) Should only pick players who were active in the past X days (optional, but a big bonus) The actual DB or data model used to store players isn't an issue here, as we'll select the technology in accordance to our needs. However, high performance and scalability is (at the moment we have over 60,000 unique daily active players, and we plan on growing even more). Thanks!

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• Is a Single Texture Cube Map Possible?

  - by smoth190

  I'm currently developing a test project to explore OpenGL 3 texturing abilities. I have a simple cube, made of 8 vertices and 36 indices. I want each of the cubes faces to have a different texture, so I devised this texture: I made it obvious which sections I want visible (I hope...). In Direct3D, I once made a skybox, and I used a cubemap. However, I had to split it into 6 different textures. This is annoying and hard to manage, it would be nice to have just one texture. Is this even possible? I read somewhere that I could do this by duplicating vertices, is that a good idea? Someone else said I could do it in the shader, but that also baffles me...

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• OpenID implementation - PHP, Javascript, MySQL

  - by Marc A.

  Hello, I've started doing some research on the technologies that I will need for my website. I'm trying to implement a really simple website with OpenID user registration. The website will store a block of text for each user. I imagine this means that I will need a database with: User ID Open ID url Data Having said that, I'm still having trouble deciding what I really need to do this. I know that I will need the following for the actual site: Javascript JQuery CSS But on the back end, I'm kind of lost at the moment. I've been looking at the OpenID-Selector, which is coded in Javascript. It seems like it's exactly what is used on this site. Will I actually need PHP? MySQL for the data and user registration? Thanks for the kickstart!

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• Linux ciblé par un mystérieux Rootkit infectant des sites Web par injection d'iFrame

  Linux ciblé par un mystérieux Rootkit infectant des sites Web par injection d'iFrame Des chercheurs en sécurité ont découvert un nouveau Rootkit ciblant les plateformes Linux. Le 13 novembre dernier, un propriétaire de site Web agacé par le comportement d'un programme poste sur le mailing-list Full Disclosure celui-ci afin d'obtenir des clarifications sur son rôle. Les experts en sécurité de Kaspersky et CrowdStrike ont confirmé par la suite qu'il s'agit d'un Rootkit conçu pour attaquer les systèmes d'exploitation Linux 64 bit, plus précisément la dernière version du kernel utilisée dans Debian Squeezy. D'un code relativement simple et encore en phase d'exp...

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• Multiple Vertex Buffers per Mesh

  - by Daniel

  I've run into the situation where the size of my mesh with all its vertices and indices, is larger than the (optimal) vertex buffer object upper limit (~8MB). I was wondering if I can sub-divide the mesh across multiple vertex buffers, and somehow retain validity of the indices. Ie a triangle with a indice at the first vertex, and an indice at the last (ie in seperate VBOs). All the while maintaining this within Vertex Array Objects. My thoughts are, save myself the hassle, and for meshes (messes :P) such as this, just use the necessary size ( 8MB); which is what I do at the moment. But ideally my buffer manager (wip) at the moment is using optimal sizes; I may just have to make a special case then... Any ideas? If necessary, a simple C++ code example is appreciated. Note: I have also cross-posted this on stackoverflow, as I was not sure as to which it would be more suitable (its partly a design question).

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• Low complexity shader to indicate the sides of a polyline

  - by Pris

  I have a bunch of polylines that I draw using GL_LINES. They can have thousands of points. They actually represent the separation of land and water on a map. I don't have complete polygons, just the ordered set of points. I'm looking for a neat but efficient way to visually convey Side A and Side B as being different. For example I could offset the polyline in one direction a few times and fade it out (but every offset is doubling the number of points), or offset it once to make a "ribbon" and give one side a 'glow' like effect to mimic the outer glow or shadow of a polygon). This is for a mobile application and I'm using OpenGL ES 2. I'd like to keep the effect as simple as possible from a complexity stand point. I'm looking for some additional ideas; maybe there's a clever shader technique out there or a visual effect I haven't considered.

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• How do I get Picasa 3.9 to play .MOV files?

  - by user44405

  I have been using Picasa for years, first in XP then in Ubuntu from 8.04 onwards & now in Lubuntu 11.10. For 11.10, I downloaded Picasa3.9.0 from FileHippo & installed it in Wine. Everything works well, except it doesn't play videos from my camera - it just shows a thumbnail - whereas earlier versions played videos OK. The videos appear as **.MOV (QuickTime video) in file manager, & can be played by, for instance, GNOME MPlayer or Movie Player (but not properly by Banshee...). Is there some simple way of getting Picasa 3.9 to play them?

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• Is it a bad idea to run SELinux and AppArmor at the same time?

  - by jgbelacqua

  My corporate policy says that Linux boxes must be secured with SELinux (so that a security auditor can check the 'yes, we're extremely secure!' checkbox for each server). I had hoped to take advantage of Ubuntu's awesome default AppArmor security. Is it unwise to run both Apparmor and SELinux? (If so, can this bad idea be mitigated with some apparmor and/or selinux tweaks?) Update 1/28 -- Kees Cook has pointed out in his answer the dead simple reason why it's a bad idea to run both -- the Linux kernel says you can't1. [ 1 More precisely, the Linux Security Modules interface framework is designed for a single running implementation, and does not support more than a single running implementation. ] Update 1/27 -- I've accepted the answer from kenny.r , though I would be happier with some more technical reasons of why this would fail, or examples of actual conflicts that this would cause.

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• Spreadsheet or writing an application?

  - by Lenny222

  When would you keep simple to medium-complex personal calculations in a spread sheet (Excel etc) and when would you write a small program or script for it? For example when you want to calculate what size of mortgage you can afford to buy a house. I could create a spreadsheet and have a nice tabular representation. On the other hand, if i would write a small script in a nice language (in my case Haskell), i'd have the security of a nice type system, preventing typos etc. What are the pro/cons in your opinion?

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• Game-a-Week 2 (The Sequel)

  - by Matt Christian

  After finishing Game-a-Week One I immediately wanted to go back and begin refactoring the code although I also wanted to work on a game demo idea I've had for quite awhile.  I tried doing both over the holiday weekend while up north (without internet!) and eventually hit a wall with an error. Today I am going to restart my refactoring and updates by starting Game-a-Week 2.  This challenge is to do the following: Refactor the old code Add a handful of new features to the demo This sounds simple enough but will be quite a challenge to finish in just around a week.  I have an idea on how I want to refactor the code, but the new features I'd like to implement will be tricky.  I'm going to try to implement: Quest giving / finishing / NPC's Quest Log Menu Inventory giving / receiving Inventory Menu This Game-a-Week is much more design oriented although will provide a good challenge for programming as well.  Wish me luck!

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• designing classes with similar goal but widely different decisional core

  - by Stefano Borini

  I am puzzled on how to model this situation. Suppose you have an algorithm operating in a loop. At every loop, a procedure P must take place, whose role is to modify an input data I into an output data O, such that O = P(I). In reality, there are different flavors of P, say P1, P2, P3 and so on. The choice of which P to run is user dependent, but all P have the same finality, produce O from I. This called well for a base class PBase with a method PBase::apply, with specific reimplementations of P1::apply(I), P2::apply(I), and P3::apply(I). The actual P class gets instantiated in a factory method, and the loop stays simple. Now, I have a case of P4 which follows the same principle, but this time needs additional data from the loop (such as the current iteration, and the average value of O during the previous iterations). How would you redesign for this case?

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• Book about tcp, http, named pipe, shared memory, wcf and other inter-process communication protocol

  - by Samuel

  Recently, I had to create a program to send messages between two winforms executable. I used a tool with simple built-in functionalities to prevent having to figure out all the ins and outs of this vast quantity of protocols that exist. But now, I'm ready to learn more about the internals difference between each of theses protocols. I googled a couple of them but it would be greatly appreciate to have a good reference book that gives me a clean idea of how each protocol works and what are the pros and cons in a couple of context. Here is a list of nice protocols that I found: Shared memory TCP List item Named Pipe File Mapping Mailslots MSMQ (Microsoft Queue Solution) WCF I know that all of these protocols are not specific to a language, it would be nice if example could be in .net. Thank you very much.

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• Interpolation gives the appearance of collisions

  - by Akroy

  I'm implementing a simple 2D platformer with a constant speed update of the game logic, but with the rendering done as fast as the machine can handle. I interpolate positions between actual game updates by just using the position and velocity of objects at the last update. This makes things look really smooth in general, but when something hits a wall/floor, it appears to go through the wall for a moment before being positioned correctly. This is because the interpolator is not taking walls into account, so it guesses the position into walls until the actual game update fixes it. Are there any particularly elegant solutions for this? Simply increasing the update rate seems like a band-aid solution, and I'm trying to avoid increasing the system reqs. I could also check for collisions in the actual interpolator, but that seems like heavy overhead, and then I'm no longer dividing the drawing and the game updating.

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• How do I dynamically reload content files?

  - by Kikaimaru

  Is there a relatively simple way to dynamically reload content files, such as effect files? I know I can do the following: Detect change of file Run content pipeline to rebuild that specific file Unload ALL content that was loaded Load all content And use double references to reference content files. The problem is with step 3 (and step 2 isn't that nice either). I need to unload everything because if I have model Hero.x which references Model.fx effect, and I change the Model.fx file, I need to reload the Hero.x file which will then call LoadExternalReference on Model.fx. Has someone managed to make this work without rewriting the whole ContentManager (and every ContentReader) and tracking calls to LoadExternalReference?

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• Basic game architechture best practices in Cocos2D on iOS

  - by MrDatabase

  Consider the following simple game: 20 squares floating around an iPhone's screen. Tapping a square causes that square to disappear. What's the "best practices" way to set this up in Cocos2D? Here's my plan so far: One Objective-c GameState singleton class (maintains list of active squares) One CCScene (since there's no menus etc) One CCLayer (child node of the scene) Many CCSprite nodes (one for each square, all child nodes of the layer) Each sprite listens for a tap on itself. Receive tap = remove from GameState Since I'm relatively new to Cocos2D I'd like some feedback on this design. For example I'm unsure of the GameState singleton. Perhaps it's unnecessary.

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• How can I boot into Windows from GRUB rescue WITHOUT CD drive?

  - by user103968

  I took this from another website's string where i found no good answer This is my situation: installed Ubuntu without a CD (using A USB) dual boot installation (Windows 7+Ubuntu) didn't like the installation and decided to boot into Windows and delete the Linux partitions forgot to fix the mbr from within Windows Now, when I boot, I am stuck in the GRUB rescue limbo. Simple question: How can I boot into Windows from GRUB rescue? I cannot boot from CD because I don't have a CD drive, therefore the usual solutions (recovery CD etc) do not work. Any hints? Is there a way i can maybe do this through a USB? Thanks

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• xbox thumbstick used to rotate sprite, basic formula makes it "stick" or feel "sticky" at 90 degree intervals! how do get smooth rotation?

  - by Hugh

  Context: C#, XNA game I am using a very basic formula to calculate what angle my sprite (spaceship for example) should be facing based on the xbox controller thumbstick ie. you use the thumbstick to rotate the ship! in my main update method: shuttleAngle = (float) Math.Atan2(newGamePadState.ThumbSticks.Right.X, newGamePadState.ThumbSticks.Right.Y); in my main draw method: spriteBatch.Draw(shuttle, shuttleCoords, sourceRectangle, Color.White, shuttleAngle, origin, 1.0f, SpriteEffects.None, 1); as you can see its quite simple, i take the current radians from the thumbstick and store it in a float "shuttleAngle" and then use this as the rotation angle (in radians) arguement for drawing the shuttle. For some reason when i rotate the sprint it feels sticky at 0, 90, 180 and 270 degrees angles, it wants to settle at those angles. its not giving me a smooth and natural rotation like i would feel in a game that uses a similar mechanic. PS: my xbox controller is fine!

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• XNA frame rate spikes in full screen mode

  - by ProgrammerAtWork

  I'm loading a simple texture and rotating it in XNA, and this works. But when I run it in full screen 1920x1080 mode I see spikes while my texture is rotating. If I run it windowed with 1920x1080 resolution, I don't get the spikes. The size of the texture does not seem to matter, I tried 512 texture size and 2048 texture size, same thing happens. Spikes in full screen, no spikes in windowed, resolution does not seem to matter, Debug or Release does not seem to do anything either. Anyone got ideas of what could be the problem? Edit: I think this problem has something to do with the vertical retrace. Set this property: _graphicsDeviceManager.SynchronizeWithVerticalRetrace = false; you'll lose vsync but it will not stutter.

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• URL structure for content that is updated daily

  - by Brendon

  A small, simple site I am working on displays a single page with the day's best offers on it. The user is able to move back and forth between previous days. Which of the following URL structures works best? Structure 1 /index.html -- today's best offers /2013-06-29.html -- yesterday's best offers, etc. Structure 2 /index.html -- 302 redirects to /2013-06-30.html (or whatever today is) /2013-06-30.html -- today's best offers /2013-06-29.html -- yesterday's best offers, etc. I quite like structure 2 from the user's point of view (they can share content easily), but I am a bit concerned about updating the redirect from /index.html every single day -- would this perhaps have unintended SEO consequences?

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• Simpler alternative to AngelScript

  - by Vee

  I want to give players the ability to create and share bullet patterns for a shoot'em up. The pattern scripts should have all the common programming stuff like loops, if/else, variables, and so on. But in the end, I just want them to call a "spawn bullet at X, Y with Z angle and A speed" in the C++ game. To spawn a circle of bullets, the user should only have to write a script with a for loop that goes from 0 to 360 and calls the spawn bullet function on every iteration. I tried integrating AngelScript, but I am getting nowhere - it looks way to complex for a simple task like this one. Is there an easy to integrate library that can solve my problem? Thanks.

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• How to use short breaks at work effectively for self-development?

  - by Alaudo

  At the moment my daily work as a developer requires me to have short 10-20 min breaks after every 2-3 hours. It would be nice if I could use those effectively to improve my expertise in programming or CS in general. I tried several things: Reading jokes online gets boring very soon. Trying to solve some (even the most simple) tasks from different code contests requires more time, as long as I have some idea of an algorithm the time is over. Reading a randomly picked Wikipedia-article about Computer Science: depending upon the article sometimes it requires more time and is not an easy reading for a break. So, I ended up reading StackOverflow questions and answers with most votes: that is entertaining and educative. Do you have any other suggestions?

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