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• Ubuntu boot problem/unity failure

  - by Kenny

  So here I am sitting in a big pile of muck...over the last 2 days things have just been going from bad to worse with version of Ubuntu 12.10. So 2 days ago I was fiddling around with kismet and airmon-ng. I had added a bunch of libraries, I remember adding GTK+, Glib, Pango, etc. After restarting the other day my desktop opened fine but my background was changed to the default and none of my files on the desktop were visible and the top bar and side bar were not visible or functioning. The window managers were still working. I then tried reinstalling my nvidia drivers to see if that would change anything, it did not. Then after doing some searching online I found something that suggested I try deleting the file "libgtk-3.so.0". I deleted this and tried to restart the computer. Upon restart, I was greeted by a black screen with some writing saying something about -starting clamAV [OK] -problem with Apache Server could not verify correct...something... - checking battery state [ok]. After it gets to battery state it just stops and sits there indefinitely. So to sum, I cannot login to ubuntu because it just sits at this black screeen. If anyone has any idea as to what is going on and how to fix it please let me know. Thanks!

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• Input Handling and Game loop

  - by Bob Coder

  So, I intercept the WM_KEYDOWN and other messages. Thing is, my game can't/shouldn't react to these messages just yet, since my game might be currently drawing to the screen or in the middle of updating my game entities. So the idea is to keep a keyboardstate and mousestate, which is updated by the part of my code that intercepts the windows messages. These states just keep track of which keys/buttons are currently pressed. Then, at the start of my game's update function, I access these keyboard and mouse states and my game reacts to the user input. Now, which is the best way to access these states? I assume that windows messages can be sent whenever, so the keyboard/mouse states are constantly being edited. Accessing say a list of currently pressed keys in the keyboard state the same time another part of the code is editing the list would cause problems. Should I make a deep copy of a state and act on that? How would I deal with the garbage generated though, this would take place every frame.

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• How can I install oracle-java7 from webupd8 ppa?

  - by Ahmed Zain El Dein

  I installed ppa:webupd8team/java and I get the following error Output from: sudo apt-get install oracle-java7-installer Reading package lists... Done Building dependency tree Reading state information... Done Suggested packages: binfmt-support visualvm ttf-baekmuk ttf-unfonts ttf-unfonts-core ttf-kochi-gothic ttf-sazanami-gothic ttf-kochi-mincho ttf-sazanami-mincho ttf-arphic-uming The following packages will be upgraded: oracle-java7-installer 1 upgraded, 0 newly installed, 0 to remove and 0 not upgraded. 1 not fully installed or removed. Need to get 0 B/16.0 kB of archives. After this operation, 64.5 kB of additional disk space will be used. Could not exec dpkg! E: Sub-process /usr/bin/dpkg returned an error code (100) i did afterwords those line of code trying to resolve the issue becuase it is not existed actually in the /usr/bin/dpkg there is no dpkg mkdir /tmp/dpkg cd /tmp/dpkg wget http://archive.ubuntu.com/ubuntu/pool/main/d/dpkg/dpkg_1.15.5.6ubuntu4_i386.deb ar x dpkg*.deb data.tar.gz tar xfvz data.tar.gz ./usr/bin/dpkg sudo cp ./usr/bin/dpkg /usr/bin/ sudo apt-get update sudo apt-get install --reinstall dpkg then i get this $ sudo apt-get install --reinstall dpkg Reading package lists... Done Building dependency tree Reading state information... Done 0 upgraded, 0 newly installed, 1 reinstalled, 0 to remove and 6 not upgraded. 1 not fully installed or removed. Need to get 0 B/1,814 kB of archives. After this operation, 0 B of additional disk space will be used. dpkg: warning: 'dpkg-deb' not found on PATH. dpkg: 1 expected program(s) not found on PATH. NB: root's PATH should usually contain /usr/local/sbin, /usr/sbin and /sbin. E: Sub-process /usr/bin/dpkg returned an error code (2) How can I fix this?

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• ASP.NET Session Management

  - by geekrutherford

  Great article (a little old but still relevant) about the inner workings of session management in ASP.NET: Underpinnings of the Session State Management Implementation in ASP.NET.   Using StateServer and the BinaryFormatter serialization occuring caused me quite the headache over the last few days. Curiously, it appears the w3wp.exe process actually consumes more memory when utilizing StateServer and storing somewhat large and complex data types in session.   Users began experiencing Out Of Memory exceptions in the production environment. Looking at the stack trace it related to serialization using the BinaryFormatter. Using remote debugging against our QA server I noted that the code in the application functioned without issue. The exception occured outside the context of the application itself when the request had completed and the web server was trying to serialize session state into the StateServer.   The short term solution is switching back to the InProc method. Thus far this has proven to consume considerably less memory and has caused no issues. Long term the complex object stored in session will be off-loaded into a web service used to access the information directly from the database outside the context of the object used to encapsulate it.

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• Can't connect to or see my wifi ssid

  - by ant

  Today I installed ubuntu 12.04 on my laptop. I am unable to see my home SSID or even connect to it. I've tried to connect as a hidden SSID but I always get prompted for authorization although my key is correct. I'm in in Europe but my laptop is from US. I'm not sure if that is relevant. I've read around this site and saw something that has to do with setting the channel above 11. I'm not sure I did that correctly I did this : How to use Wi-Fi channels above 11? Did't help. I'm able to connect with cable but not via wifi either windows or linux. Other devices in my home can connect without any issues, even the kindle. Here is the screenshot from my router : Here is some additional info : lspci | grep -i network 08:00.0 Network controller: Qualcomm Atheros AR9285 Wireless Network Adapter (PCI-Express) (rev 01) lspci -nnk | grep -A2 0280 08:00.0 Network controller [0280]: Qualcomm Atheros AR9285 Wireless Network Adapter (PCI-Express) [168c:002b] (rev 01) Subsystem: Hewlett-Packard Company U98Z062.10 802.11bgn Wireless Half-size Mini PCIe Card [103c:303f] Kernel driver in use: ath9k m-tool NetworkManager Tool State: connected (global) Device: wlan0 ---------------------------------------------------------------- Type: 802.11 WiFi Driver: ath9k State: disconnected Default: no HW Address: 90:4C:E5:38:79:0D Capabilities: Wireless Properties WEP Encryption: yes WPA Encryption: yes WPA2 Encryption: yes I'm not sure what to do next. Any suggestions?

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• Does immutability entirely eliminate the need for locks in multi-processor programming?

  - by GlenPeterson

  Part 1 Clearly Immutability minimizes the need for locks in multi-processor programming, but does it eliminate that need, or are there instances where immutability alone is not enough? It seems to me that you can only defer processing and encapsulate state so long before most programs have to actually DO something. If a program performs actions on multiple processors, something needs to collect and aggregate the results. All this involves multi-process communication before, after, and possibly during some transformations. The start and end state of the machines are different. Can this always be done with no locks just by throwing out each object and creating a new one instead of changing the original (a crude view of immutability)? What cases still require locking? I'm interested in both the theoretical/academic answer and the practical/real-world answer. I know a lot of functional programmers like to talk about "no side effect" but in the "real world" everything has a side effect. Every processor click takes time and electricity and machine resources away from other processes. So I understand that there may be more than one perspective to answer this question from. If immutability is safe, given certain bounds or assumptions, I want to know what the borders of the "safety zone" are exactly. Some examples of possible boundaries: I/O Exceptions/errors Interfaces with programs written in other languages Interfaces with other machines (physical, virtual, or theoretical) Special thanks to @JimmaHoffa for his comment which started this question! Part 2 Multi-processor programming is often used as an optimization technique - to make some code run faster. When is it faster to use locks vs. immutable objects? Given the limits set out in Amdahl's Law, when can you achieve better over-all performance (with or without the garbage collector taken into account) with immutable objects vs. locking mutable ones? Summary I'm combining these two questions into one to try to get at where the bounding box is for Immutability as a solution to threading problems.

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• Prefer class members or passing arguments between internal methods?

  - by geoffjentry

  Suppose within the private portion of a class there is a value which is utilized by multiple private methods. Do people prefer having this defined as a member variable for the class or passing it as an argument to each of the methods - and why? On one hand I could see an argument to be made that reducing state (ie member variables) in a class is generally a good thing, although if the same value is being repeatedly used throughout a class' methods it seems like that would be an ideal candidate for representation as state for the class to make the code visibly cleaner if nothing else. Edit: To clarify some of the comments/questions that were raised, I'm not talking about constants and this isn't relating to any particular case rather just a hypothetical that I was talking to some other people about. Ignoring the OOP angle for a moment, the particular use case that I had in mind was the following (assume pass by reference just to make the pseudocode cleaner) int x doSomething(x) doAnotherThing(x) doYetAnotherThing(x) doSomethingElse(x) So what I mean is that there's some variable that is common between multiple functions - in the case I had in mind it was due to chaining of smaller functions. In an OOP system, if these were all methods of a class (say due to refactoring via extracting methods from a large method), that variable could be passed around them all or it could be a class member.

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• Partner Showcase -- GreyHeller

  - by PeopleTools Strategy

  This is the next in a series of posts spotlighting some of our creative partners.  GreyHeller is a PeopleSoft-focused software company founded by PeopleTools alumni Larry Grey and Chris Heller.  GreyHeller’s products focus on addressing the technology needs of PeopleSoft customers in the areas of mobile Enablement, reporting/business intelligence, security, and change management.  The company helps customers protect and extend their investment in PeopleSoft.GreyHeller’s products and services are in use by nearly 100 PeopleSoft customers on 6 continents.  Their product solutions are lightweight bolt-ons--extensions to a customer’s PeopleSoft environment requiring no new infrastructure.  This makes for rapid implementations.A major area of interest for PeopleSoft customers these days is mobile enablement.  GreyHeller's current mobile implementations include the following customers: Texas Christian University (Live:  TCU student newspaper article here) Coppin State University (Live) University of Cambridge (June go-live) HealthSouth (June go-live) Frostburg State Univrsity (Q3 go-live) Amedisys (Q3 go-live) GreyHeller maintains a PeopleTools-focused blog that provides tips, techniques, and code snippets aimed at helping PeopleSoft customers make the most of their PeopleSoft system.  In addition to their blog, the GreyHeller team conducts and records weekly webinars that demonstrate latest PeopleTools features and Tips and techniques.  Recordings of these webinars can be accessed here.Visit GreyHeller’s web site for more information on the company and its work.

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• Set up Work Manager Shutdown Trigger in WebLogic Server 10.3.4 Using WLST

  - by adejuanc

  WebLogic Server's Work Managers provide a way to control work and allocated threads. You can set different scheduling guidelines for different applications, depending on your requirements. There is a default self-tuning Work Manager, but you might want to set up a custom work manager in some circumstances: for example, when you want the server to prioritize one application over another when a response time goal is required, or when a minimum thread constraint is needed to avoid deadlock. The Work Manager Shutdown Trigger is a tool to help with stuck threads in which will do the following: Shut down the Work Manager. Move the application to Admin State (not active). Change the Server instance health state to failed. Example of a Shutdown Trigger set on the config.xml for your domain: <work-manager>   <name>stuckthread_workmanager</name>   <work-manager-shutdown-trigger>     <max-stuck-thread-time>30</max-stuck-thread-time>     <stuck-thread-count>2</stuck-thread-count>   </work-manager-shutdown-trigger> </work-manager> Understand that any misconfiguration on the Work Manager can lead to poor performance on the server. Any changes must be done and tested before going to production. How can one create a WorkManagerShutdownTrigger for WLS 10.3.4 using WLST? You should be able to create a WorkManagerShutdownTrigger using WLST by following these steps: edit() startEdit() cd('/SelfTuning/mydomain/WorkManagers') create('myWM','WorkManager') cd('myWM/WorkManagerShutdownTrigger') create('myWMst','WorkManagerShutdownTrigger') cd('myWMst') ls()

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• Proportional speed movement between mouse and cube

  - by user1350772

  Hi i´m trying to move a cube with the freeglut mouse "glutMotionFunc(processMouseActiveMotion)" callback, my problem is that the movement is not proportional between the mouse speed movement and the cube movement. MouseButton function: #define MOVE_STEP 0.04 float g_x=0.0f; glutMouseFunc(MouseButton); glutMotionFunc(processMouseActiveMotion); void MouseButton(int button, int state, int x, int y){ if(button == GLUT_LEFT_BUTTON && state== GLUT_DOWN){ initial_x=x; } } When the left button gets clicked the x cordinate is stored in initial_x variable. void processMouseActiveMotion(int x,int y){ if(x>initial_x){ g_x-= MOVE_STEP; }else{ g_x+= MOVE_STEP; } initial_x=x; } When I move the mouse I look in which way it moves comparing the mouse new x coordinate with the initial_x variable, if xinitial_x the cube moves to the right, if not it moves to the left. Any idea how can i move the cube according to the mouse movement speed? Thanks EDIT 1 The idea is that when you click on any point of the screen and you drag to the left/right the cube moves proportionally of the mouse mouvement speed.

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• Are first-class functions a substitute for the Strategy pattern?

  - by Prog

  The Strategy design pattern is often regarded as a substitute for first-class functions in languages that lack them. So for example say you wanted to pass functionality into an object. In Java you'd have to pass in the object another object which encapsulates the desired behavior. In a language such as Ruby, you'd just pass the functionality itself in the form of an annonymous function. However I was thinking about it and decided that maybe Strategy offers more than a plain annonymous function does. This is because an object can hold state that exists independently of the period when it's method runs. However an annonymous function by itself can only hold state that ceases to exist the moment the function finishes execution. So my question is: when using a language that features first-class functions, would you ever use the Strategy pattern (i.e. encapsulate the functionality you want to pass around in an explicit object), or would you always use an annonymous function? When would you decide to use Strategy when you can use a first-class function?

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• Uses of persistent data structures in non-functional languages

  - by Ray Toal

  Languages that are purely functional or near-purely functional benefit from persistent data structures because they are immutable and fit well with the stateless style of functional programming. But from time to time we see libraries of persistent data structures for (state-based, OOP) languages like Java. A claim often heard in favor of persistent data structures is that because they are immutable, they are thread-safe. However, the reason that persistent data structures are thread-safe is that if one thread were to "add" an element to a persistent collection, the operation returns a new collection like the original but with the element added. Other threads therefore see the original collection. The two collections share a lot of internal state, of course -- that's why these persistent structures are efficient. But since different threads see different states of data, it would seem that persistent data structures are not in themselves sufficient to handle scenarios where one thread makes a change that is visible to other threads. For this, it seems we must use devices such as atoms, references, software transactional memory, or even classic locks and synchronization mechanisms. Why then, is the immutability of PDSs touted as something beneficial for "thread safety"? Are there any real examples where PDSs help in synchronization, or solving concurrency problems? Or are PDSs simply a way to provide a stateless interface to an object in support of a functional programming style?

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• CodePlex Daily Summary for Saturday, September 15, 2012

  CodePlex Daily Summary for Saturday, September 15, 2012Popular ReleasesMCEBuddy 2.x: MCEBuddy 2.2.15: Changelog for 2.2.15 (32bit and 64bit) 1. Added support for %originalfilepath% to get the source file full path. Used for custom commands only. 2. Added support for better parsing of Media Portal XML files to extract ShowName and Episode Name and download additional details from TVDB (like Season No, Episode No etc). 3. Added support for TVDB seriesID in metadata 4. Added support for eMail non blocking UI testCrashReporter.NET : Exception reporting library for C# and VB.NET: CrashReporter.NET 1.2: *Added html mail format which shows hierarchical exception report for better understanding.VCC: Latest build, v2.3.00914.0: Automatic drop of latest buildScarlet Road: Scarlet Road Test Build 007: Playable game. Includes source.DotNetNuke Search Engine Sitemaps Provider: Version 02.00.00: New release of the Search Engine Sitemap Providers New version - not backwards compatible with 1.x versions New sandboxing to prevent exceptions in module providers interfering with main provider Now installable using the Host->Extensions page New sitemaps available for Active Forums and Ventrian Property Agent Now derived from DotNetNuke Provider base for better framework integration DotNetNuke minimum compatibility raised to DNN 5.2, .NET to 3.5PDF Viewer Web part: PDF Viewer Web Part: PDF Viewer Web PartChris on SharePoint Solutions: View Grid Banding - v1.0: Initial release of the View Creation and Management Page Column Selector Banding solution.$linq - A Javascript LINQ library: Version 1.0: Version 1.0 Initial releasePowerConverter: PowerConverter Beta: This is the first release of PowerConverter. Allows for converting PE code to Power code.NetView Control for Microsoft Access: DevVersion 19852 - More Databinding and Resizing: NetView Renamed event GotFocus to Clicked Added events Clicked/DoubleClicked Added event BackgroundDoubleClicked Changed nomenclature for world coordinates to (Position1, Position2)|Extent1xExtent2 Renamed Locked -> Readonly Added properties Minimum1/Maximum1 and Minimum2/Maximum2 Removed NetView.DeviceDefinitionArea, obsolete properties Support for resizing Added properties BackColor and BorderColor NetView Properties form added binding field for BusinessId propagate erro...Runtime Dynamic Data Model Builder: Main Library Version 1.0.0.0: Main Library Version 1.0.0.0Microsoft Ajax Minifier: Microsoft Ajax Minifier 4.67: Fix issue #18629 - incorrectly handling null characters in string literals and not throwing an error when outside string literals. update for Issue #18600 - forgot to make the ///#DEBUG= directive also set a known-global for the given debug namespace. removed the kill-switch for disregarding preprocessor define-comments (///#IF and the like) and created a separate CodeSettings.IgnorePreprocessorDefines property for those who really need to turn that off. Some people had been setting -kil...Lakana - WPF Framework: Lakana V2: Lakana V2 contains : - Lakana WPF Forms (with sample project) - Lakana WPF Navigation (with sample project)Microsoft SQL Server Product Samples: Database: OData QueryFeed workflow activity: The OData QueryFeed sample activity shows how to create a workflow activity that consumes an OData resource, and renders entity properties in a Microsoft Excel 2010 worksheet or Microsoft Word 2010 document. Using the sample QueryFeed activity, you can consume any OData resource. The sample activity uses LINQ to project OData metadata into activity designer expression items. By setting activity expressions, a fully qualified OData query string is constructed consisting of Resource, Filter, Or...Arduino for Visual Studio: Arduino 1.x for Visual Studio 2012, 2010 and 2008: Register for the visualmicro.com forum for more news and updates Version 1209.10 includes support for VS2012 and minor fixes for the Arduino debugger beta test team. Version 1208.19 is considered stable for visual studio 2010 and 2008. If you are upgrading from an older release of Visual Micro and encounter a problem then uninstall "Visual Micro for Arduino" using "Control Panel>Add and Remove Programs" and then run the install again. Key Features of 1209.10 Support for Visual Studio 2...Social Network Importer for NodeXL: SocialNetImporter(v.1.5): This new version includes: - Fixed the "resource limit" bug caused by Facebook - Bug fixes To use the new graph data provider, do the following: Unzip the Zip file into the "PlugIns" folder that can be found in the NodeXL installation folder (i.e "C:\Program Files\Social Media Research Foundation\NodeXL Excel Template\PlugIns") Open NodeXL template and you can access the new importer from the "Import" menuAcDown????? - AcDown Downloader Framework: AcDown????? v4.1: ??●AcDown??????????、??、??、???????。????，????，?????????????????????????。???????????Acfun、????(Bilibili)、??、??、YouTube、??、???、??????、SF????、????????????。 ●??????AcPlay?????，??????、????????????????。 ● AcDown??????????????????，????????????????????????????。 ● AcDown???????C#??，????.NET Framework 2.0??。?????"Acfun?????"。 ????32??64? Windows XP/Vista/7/8 ???? 32??64? ???Linux ????(1)????????Windows XP???,?????????.NET Framework 2.0???(x86)，?????"?????????"??? (2)???????????Linux???，????????Mono?? ??...Move Mouse: Move Mouse 2.5.2: FIXED - Minor fixes and improvements.MVC Controls Toolkit: Mvc Controls Toolkit 2.3: Added The new release is compatible with Mvc4 RTM. Support for handling Time Zones in dates. Specifically added helper methods to convert to UTC or local time all DateTimes contained in a model received by a controller, and helper methods to handle date only fileds. This together with a detailed documentation on how TimeZones are handled in all situations by the Asp.net Mvc framework, will contribute to mitigate the nightmare of dates and timezones. Multiple Templates, and more options to...DNN Metro7 style Skin package: Metro7 style Skin for DotNetNuke 06.02.00: Maintenance Release Changes on Metro7 06.02.00 Fixed width and height on the jQuery popup for the Editor. Navigation Provider changed to DDR menu Added menu files and scripts Changed skins to Doctype HTML Changed manifest to dnn6 manifest file Changed License to HTML view Fixed issue on Metro7/PinkTitle.ascx with double registering of the Actions Changed source folder structure and start folder, so the project works with the default DNN structure on developing Added VS 20...New ProjectsBizTalk Zombie Management: A powerful tool to handle zombie. As a service you can monitor all zombie instance and process them. For the moment only file is supporting.bxkw8: oooooooooooh long johnsonCellularSolver: The main idea of a this project - create cellular automation (CA) simulation system. We try to reduce ODE/PDE/Integral Equations models to CA-modelEAWebService: EAWebService is web service that executes parallel evolutionary algorithm. Finite Element Method Samples with C#: Finite Element Method Samples with C# Game Jolt C# Trophy API: The Game Jolt Trophy API provides dotNET developers with access to the Game Jolt services including Trophies, High Scores, Data Storage and many more.GNSystem: GNSystem is a simple (yet, no so elegant) Web-Application which contains a Forum system and a CMS\Blog system. GNSystem is written in ASP.Net MVC 4 using C#Hospital Management System (HMS): HMS is a software basically working to make the hospital management much easier and fasterInfinity - WPF.MVC: Framework for WPF/SL/WinFormsKindle: Kindle PublisherMetroCash: A personal finance management programmetroCIS: metroCIS - Eine open-source Anwendung für Windows8 Verwalte dein Studium an der FH Technikum Wien mit dieser App und erleichter dir damit dein Studentenleben.MTAC: MTAC, for My Tfs Administration Center, is a centralized administration tool for TFSMyStart: Create an Open Source implementation of the Windows Start Menu (based initially on Windows 7), to be used on Windows 8.NLite Data Framework: NLite Linq ORM frameworkPDF Viewer Web part: Here now presenting PDF Viewer web part solution with code. Project91405: dfgfdgfdrProject91407: awqwqProject91407M: 111Purchasesales(??????): a simple Sales Manage Project.QueryOver Specification: A simple implementation of the Specification Pattern using NHibernate QueryOver.Shopping Analytics: Esta aplicacion muestra como aprovechar diversas caracteristicas de la plataforma Windows Phone.simbo: Simbo is a simple, fun app for sharing small notes with friends where many of the concepts in your note can be represented by a symbols.SISLOG: El sistema de logística SISLOG es un software que cual será capaz de automatizar y optimizar los procesos que se llevan a cabo en el área de logística.SQL Server Scripts - A RSSUG CodePlex Project: The SQL Server Scripts project is dedicated to supplying high quality scripts to help with the maintenance and development of SQL Server in every environment.Talqum.League: Talqum.League is a League organisator and statistics app.The Pratoriate Foundation: used for all software dev projects for the non profit Pratoriate Foundation.

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• Problem with APTonCD application

  - by Harikrishnan

  I created a iso image using aptoncd & burned it to a dvd. Now when i tried to restore, the program does not detect the dvd in the drive. It shows "Please insert a disc in the drive." and if we click "ok" it shows E: Failed to mount the cdrom. The dvd is in the drive itself. I tried sudo lshw -C disk and the output is: *-cdrom description: DVD-RAM writer product: DVDRAM GH22NS50 vendor: HL-DT-ST physical id: 1 bus info: scsi@1:0.0.0 logical name: /dev/cdrom logical name: /dev/cdrw logical name: /dev/dvd logical name: /dev/dvdrw logical name: /dev/scd0 logical name: /dev/sr0 logical name: /media/APTonCD logical name: /media/apt version: TN02 capabilities: removable audio cd-r cd-rw dvd dvd-r dvd-ram configuration: ansiversion=5 mount.fstype=iso9660 mount.options=ro,relatime,uid=1000,gid=1000,iocharset=utf8,mode=0400,dmode=0500 state=mounted status=ready *-medium physical id: 0 logical name: /dev/cdrom logical name: /media/APTonCD logical name: /media/apt configuration: mount.fstype=iso9660 mount.options=ro,relatime,uid=1000,gid=1000,iocharset=utf8,mode=0400,dmode=0500 state=mounted Then i checked in disk utility application. in that dvd rom is shown as /dvd/sr0 My ubuntu version is 10.10. Please help me to solve the problem.

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• Logic / Render phases with a single thread

  - by DevilWithin

  The question I have may generate different opinions from different developers, but I'd still like to have an answer on this. Its all about the updating and rendering steps of the game loop, and their use under multi and single threaded environments. Currently, there is one thread running, which takes care of sequentially executing events , logic and rendering. Sometimes, the logic part may wish to change the game state to something else, and in between do some loading of files. The result is that the game hangs completely while loading, and then proceeds to normal rendering of the new state. To go around this, i could make another thread, do the loading there while the main thread renders a smooth loading animation, and then proceed normally. The real question is about if i don't create another thread. I could refresh the screen from the logic thread, and provide some basic loading screen, which could be not so smoothly updated while the files load. In fact, this approach is not loved by a lot of developers, as it scrambles render code in the logic step, which may cause problems of different sorts.. Hope its clear!

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• Per-vertex animation with VBOs: Stream each frame or use index offset per frame?

  - by charstar

  Scenario Meshes are animated using either skeletons (skinned animation) or some form of morph targets (i.e. per-vertex key frames). However, in either case, the animations are known in full at load-time, that is, there is no physics, IK solving, or any other form of in-game pose solving. The number of character actions (animations) will be limited but rich (hand-animated). There may be multiple characters using a each mesh and its animations simultaneously in-game (they will be at different poses/keyframes at the same time). Assume color and texture coordinate buffers are static. Goal To leverage the richness of well vetted animation tools such as Blender to do the heavy lifting for a small but rich set of animations. I am aware of additive pose blending like that from Naughty Dog and similar techniques but I would prefer to expend a little RAM/VRAM to avoid implementing a thesis-ready pose solver. I would also like to avoid implementing a key-frame + interpolation curve solver (reinventing Blender vertex groups and IPOs). Current Considerations Much like a non-shader-powered pose solver, create a VBO for each character and copy vertex and normal data to each VBO on each frame (VBO in STREAMING). Create one VBO for each animation where each frame (interleaved vertex and normal data) is concatenated onto the VBO. Then each character simply has a buffer pointer offset based on its current animation frame (e.g. pointer offset = (numVertices+numNormals)*frameNumber). (VBO in STATIC) Known Trade-Offs In 1 above: Each VBO would be small but there would be many VBOs and therefore lots of buffer binding and vertex copying each frame. Both client and pipeline intensive. In 2 above: There would be few VBOs therefore insignificant buffer binding and no vertex data getting jammed down the pipe each frame, but each VBO would be quite large. Are there any pitfalls to number 2 (aside from finite memory)? Are there other methods that I am missing?

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• Kids and programming: ScratchKara

  - by Mike Pagel

  Ever now and then I kept wondering how to share with my kids the excitement of creating something with your computer. Of course, today this is a bit more difficult, as they have seen 3D animation games and well-edited websites. I guess that's why they weren't all that hyped when I found my first computer model at our local recycling facilities (an 8-bit Laser VZ-200 with rubber keys). When I finally got it up and running with an old analog TV set they finally asked whether we could play soccer on it. Needless to say that my showing them how it remembers some BASIC commands and lists and executes them did not make any impression. So the question is for real: How do you get today's kids excited about programming? And just recently I looked again for environments that allow even young kids (mine are 7 and 9 years old now) to do something and have fun. Obviously any real, text-oriented programming language wouldn't work well. To cut it short: Something really nice was built by University of Oldenburg: ScratchKara. It is the perfect mixture of Kara, a simulation of a little ladybug and Scratch, an authoring environment from MIT. ScratchKara allows kids to initially simply explore how the bug moves and turns by pressing the action buttons, then move towards sequencing commands through drag & drop, and eventually end up building algorithms with procedures and functions. Even through it is built for kids and beginners, the environment comes with debugging and refactoring, which I found more than amazing. My kids love it and I have to admit I keep thinking about how to solve a bit more advanced problems with this language, which does not allow you to store any state information (other than your call stack). Yes, I am hooked, too... Once the language is understood you can then move to one of the original Kara versions, where you can define the bug's behavior through finite statemachines, Turing tables, Java and other textual languages. And from there, anything is possible.

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• TDD: Write a separate test for object initialization or relying on other tests exercising it

  - by DXM

  This seems to be the common pattern that's emerging in some of the tests I've worked on lately. We have a class, and quite often this is legacy code whose design can't be easily altered, which has a bunch of member variables. There's some kind of "Initialize" or "Load" function which would put an object into a valid state. Only after it is initialized/loaded, are the members in the proper state so that other methods can be exercised. So when we start writing tests, first test is "TestLoad" and all we put in there is exercising initialization logic. Then we might add one (or few) TestLoadFailureXXX tests and those are definitely valuable. Then we start writing tests to verify other behaviors but all of them require the object to be loaded. So they all start by running exactly the same code as "TestLoad". So my question: Is TestLoad even necessary? Do you take it and let other tests simply exercise the loading? Or leave it so things are more explicit? I know that each unit test function should have no (or as little as possible) overlap with other test functions, but it seems like in cases of loading, this is unavoidable. And whether we like it or not, if something in the loading code breaks, we will end up with a whole test suite of failures. Is there another approach that I might be missing here? Thank you for the responses. It definitely makes sense that you want to see "InitializationTest" and if that fails you know where to start looking. In case it matters, this question is mostly about C++ and we use CppUnit framework. And now, thanks to sleske, I'll be constantly wishing that CppUnit supported test dependencies. Might have to hack something in one of these days :)

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• In MVC , DAO should be called from Controller or Model

  - by tito

  I have seen various arguments against the DAO being called from the Controller class directly and also the DAO from the Model class.Infact I personally feel that if we are following the MVC pattern , the controller should not coupled with the DAO , but the Model class should invoke the DAO from within and controller should invoke the model class.Why because , we can decouple the model class apart from a webapplication and expose the functionalities for various ways like for a REST service to use our model class. If we write the DAO invocation in the controller , it would not be possible for a REST service to reuse the functionality right ? I have summarized both the approaches below. Approach #1 public class CustomerController extends HttpServlet { proctected void doPost(....) { Customer customer = new Customer("xxxxx","23",1); new CustomerDAO().save(customer); } } Approach #2 public class CustomerController extends HttpServlet { proctected void doPost(....) { Customer customer = new Customer("xxxxx","23",1); customer.save(customer); } } public class Customer { ........... private void save(Customer customer){ new CustomerDAO().save(customer); } } Note- Here is what a definition of Model is : Model: The model manages the behavior and data of the application domain, responds to requests for information about its state (usually from the view), and responds to instructions to change state (usually from the controller). In event-driven systems, the model notifies observers (usually views) when the information changes so that they can react. I would need an expert opinion on this because I find many using #1 or #2 , So which one is it ?

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• SQL Server Database Settings

  - by rbishop

  For those using Data Relationship Management on Oracle DB this does not apply, but for those using Microsoft SQL Server it is highly recommended that you run with Snapshot Isolation Mode. The Data Governance module will not function correctly without this mode enabled. All new Data Relationship Management repositories are created with this mode enabled by default. This mode makes SQL Server (2005+) behave more like Oracle DB where readers simply see older versions of rows while a write is in progress, instead of readers being blocked by locks while a write takes place. Many common sources of deadlocks are eliminated. For example, if one user starts a 5 minute transaction updating half the rows in a table, without snapshot isolation everyone else reading the table will be blocked waiting. With snapshot isolation, they will see the rows as they were before the write transaction started. Conversely, if the readers had started first, the writer won't be stuck waiting for them to finish reading... the writes can begin immediately without affecting the current transactions. To make this change, make sure no one is using the target database (eg: put it into single-user mode), then run these commands: ALTER DATABASE [DB] SET ALLOW_SNAPSHOT_ISOLATION ONALTER DATABASE [DB] SET READ_COMMITTED_SNAPSHOT ON Please make sure you coordinate with your DBA team to ensure tempdb is appropriately setup to support snapshot isolation mode, as the extra row versions are stored in tempdb until the transactions are committed. Let me take this opportunity to extremely strongly highly recommend that you use solid state storage for your databases with appropriate iSCSI, FiberChannel, or SAN bandwidth. The performance gains are significant and there is no excuse for not using 100% solid state storage in 2013. Actually unless you need to store petabytes of archival data, there is no excuse for using hard drives in any systems, whether laptops, desktops, application servers, or database servers. The productivity benefits alone are tremendous, not to mention power consumption, heat, etc.

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• How to re-add RAID-10 dropped drive?

  - by thiesdiggity

  I have a problem that I can't seem to solve. We have a Ubuntu server setup with RAID-10 and two of the drives dropped out of the array. When I try to re-add them using the following command: mdadm --manage --re-add /dev/md2 /dev/sdc1 I get the following error message: mdadm: Cannot open /dev/sdc1: Device or resource busy When I do a "cat /proc/mdstat" I get the following: Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [r$ md2 : active raid10 sdb1[0] sdd1[3] 1953519872 blocks 64K chunks 2 near-copies [4/2] [U__U] md1 : active raid1 sda2[0] sdc2[1] 468853696 blocks [2/2] [UU] md0 : active raid1 sda1[0] sdc1[1] 19530688 blocks [2/2] [UU] unused devices: <none> When I run "/sbin/mdadm --detail /dev/md2" I get the following: /dev/md2: Version : 00.90 Creation Time : Mon Sep 5 23:41:13 2011 Raid Level : raid10 Array Size : 1953519872 (1863.02 GiB 2000.40 GB) Used Dev Size : 976759936 (931.51 GiB 1000.20 GB) Raid Devices : 4 Total Devices : 2 Preferred Minor : 2 Persistence : Superblock is persistent Update Time : Thu Oct 25 09:25:08 2012 State : active, degraded Active Devices : 2 Working Devices : 2 Failed Devices : 0 Spare Devices : 0 Layout : near=2, far=1 Chunk Size : 64K UUID : c6d87d27:aeefcb2e:d4453e2e:0b7266cb Events : 0.6688691 Number Major Minor RaidDevice State 0 8 17 0 active sync /dev/sdb1 1 0 0 1 removed 2 0 0 2 removed 3 8 49 3 active sync /dev/sdd1 Output of df -h is: Filesystem Size Used Avail Use% Mounted on /dev/md1 441G 2.0G 416G 1% / none 32G 236K 32G 1% /dev tmpfs 32G 0 32G 0% /dev/shm none 32G 112K 32G 1% /var/run none 32G 0 32G 0% /var/lock none 32G 0 32G 0% /lib/init/rw tmpfs 64G 215M 63G 1% /mnt/vmware none 441G 2.0G 416G 1% /var/lib/ureadahead/debugfs /dev/mapper/RAID10VG-RAID10LV 1.8T 139G 1.6T 8% /mnt/RAID10 When I do a "fdisk -l" I can see all the drives needed for the RAID-10. The RAID-10 is part of the /dev/mapper, could that be the reason why the device is coming back as busy? Anyone have any suggestions on what I can try to get the drives back into the array? Any help would be greatly appreciated. Thanks!

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• How to debug suspend?

  - by mlissner

  I've been using Ubuntu for about five years now, and I still can't make it suspend when I want to. It's quite irritating that I can program up a storm, hack the machine in numerous other ways, and yet, and yet when I try to make it suspend or debug suspend, I fail miserably. I need help. Where do I begin to find the problem? What do I do to fix it? I'm placing a bounty on this, because I've literally lost hours of my life to this problem, and leaving my computer on ALL the time is terrible. The symptoms: Pressing suspend brings my computer to a state where it has a blinking cursor, the fans are running, it seems that the HD has turned off (I think), and I can't do anything to bring it back from this state (short of a hard reboot). Possibly related: My fans stay on even after a shutdown, and even then, I have to press the power button for five seconds before I can start it up again. I don't know what logs to look at to debug the problem, and I imagine they'd get nuked on reboot anyway. Please, please help. This drives me completely nuts, and I've been living with it for over a year.

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• Really impossible to have Gimp 2.8 on Ubuntu 11.10?

  - by ubuntico

  For days, I have been trying to find a solution and repositories to install Gimp 2.8 on Ubuntu 11.10. Each time I get this error: Tried to update pango via sudo apt-get install pango-graphite [sudo] password for xxx: Reading package lists... Done Building dependency tree Reading state information... Done pango-graphite is already the newest version. Then also tried sudo apt-get install libgdk-pixbuf2* Reading package lists... Done Building dependency tree Reading state information... Done Note, selecting 'libgdk-pixbuf2.0-0' for regex 'libgdk-pixbuf2*' Note, selecting 'libgdk-pixbuf2.0-dev' for regex 'libgdk-pixbuf2*' Note, selecting 'libgdk-pixbuf2.0-doc' for regex 'libgdk-pixbuf2*' Note, selecting 'libgdk-pixbuf2-ruby' for regex 'libgdk-pixbuf2*' Note, selecting 'libgdk-pixbuf2-ruby1.8' for regex 'libgdk-pixbuf2*' Note, selecting 'libgdk-pixbuf2-ruby1.8-dbg' for regex 'libgdk-pixbuf2*' Note, selecting 'libgdk-pixbuf2.0-common' for regex 'libgdk-pixbuf2*' libgdk-pixbuf2-ruby is already the newest version. libgdk-pixbuf2-ruby1.8 is already the newest version. libgdk-pixbuf2-ruby1.8-dbg is already the newest version. libgdk-pixbuf2.0-doc is already the newest version. libgdk-pixbuf2.0-0 is already the newest version. libgdk-pixbuf2.0-dev is already the newest version. libgdk-pixbuf2.0-common is already the newest version. 0 upgraded, 0 newly installed, 0 to remove and 31 not upgraded. And still error :(. Please help as I do not want to upgrade to Ubuntu 12.04 just to have Gimp. Really a mission impossible????

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• Interpolation between two 3D points?

  - by meds

  I'm working with some splines which define a path a character follows (you can see a gameplay video here to get a better understanding of what's going on: http://www.youtube.com/watch?v=BndobjOiZ6g). Basically the characters 'forward' look direction is set to the 'forward' direction of the spline and when players tilt their phone left and right the character is strafed along its 'right' coordinate. The issue with this is (rather obviously) in performance, interpolating over a spline to find the nearest position and tangent relative to the player is an incredibly costly operation. To get by this I cache a finite number of positions in what I call 'SplineDetails', the class is as follows: public class SplineDetails { public SplineDetails() { Forward = Vector3.forward; Position = Vector3.one * float.MaxValue; Alpha = -1; } public float Alpha; // [0,1] measured along length of spline where 0 is the initial point and 1 is the end point of the spline public Vector3 Position; // the point of the spline at this alpha public Vector3 Forward; // the forward tangent of the spline at this alpha } I populate this with say 30 coordinates and I can give a rough estimate of a coordinate and 'forward' based on a position past in. It's not as accurate but it's much faster. But now I'd like to make the system work better by estimating positions and 'forward' directions by interpolating between two of the cached points though I'm stuck trying to figure out some logic. My first problem is, how can I determine between which two points the object is? Given each point can be placed at different intervals along the spline it could mean that two points in front or behind the object can be closer to the object. The other problem is to figure out the proportion between the two paths it's between, i.e. if there is a point a at coordinate (0,0,0) and point b at coordinate (1,0,0) if the object is at position (0.5,0,0) then the result it should give is '0.5' (as it is equal distance away from point a and point b). That's a simple example, but what if the object is at coordinate (0.5,3,0) for example?

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• Unable to install Skype ("Unmet dependencies" error)

  - by Alex Maslakov

  Trying to install skype on Ubuntu 12, I faced and issue. When I type: sudo apt-get update sudo apt-get install skype I get an error Reading package lists... Done Building dependency tree Reading state information... Done skype is already the newest version. You might want to run 'apt-get -f install' to correct these: The following packages have unmet dependencies: skype : Depends: lib32stdc++6 (>= 4.1.1-21) but it is not going to be installed Depends: lib32asound2 (> 1.0.14) but it is not going to be installed Depends: ia32-libs but it is not going to be installed Depends: libc6-i386 (>= 2.7-1) but it is not going to be installed Depends: lib32gcc1 (>= 1:4.1.1-21+ia32.libs.1.19) but it is not going to be installed E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution). How do I solve it? Is the way I'm using the right one to install skype? UPDATE: If I try to do sudo apt-get install lib32stdc++6 lib32asound2 ia32-libs libc6-i386 lib32gcc1 skype then I get Reading package lists... Done Building dependency tree Reading state information... Done skype is already the newest version. You might want to run 'apt-get -f install' to correct these: The following packages have unmet dependencies: ia32-libs : Depends: ia32-libs-multiarch lib32asound2 : Depends: libasound2 (= 1.0.25-1ubuntu10) E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution).

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