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• What is the increase in developer productivity while using Hibernate?

  - by Tarun Kohli

  I was curious to find out the percentage increase in developer's productivity by using Hibernate. We use both Hibernate and NHibernate extensively and find them to be extremely elegant frameworks but haven't undertaken any study to find out the time savings by using them. IMHO, one could get a good 30 to 40% jump in developer productivity as one doesn't have to write the basic CRUD operations and bother about caching. But, are there are any formal case studies which prove that point? I would really appreciate if someone could direct me to a published white paper about some statistics about the productivity gains.

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• How to use OpenGL functions from multiples thread?

  - by Robert

  I'm writing a small game using OpenGL. I'm implementing basic networking in this game and I'm facing a problem. I have a thread in my client socket class that check for available data, when there are data I raise an event like this : immutable int len = this.m_socket.receive(data); if(len > 0) { this.m_onDataEvent(data); } Then on my game class, I have a function that handle and parse data like this : switch(msgId) { case ProtocolID.CharacterData: // Load terrain with opengl, character model.... Im not able to call opengl functions because my opengl context is created from a different thread. But I really don't know how I can solve this problem, I tried Google but it's really hard to find a solution. I'm using D programming language if it can help.

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• Logging in over and over again. How to fix this?

  - by romeovs

  Ok, I messed up. I installed ubuntu 11.10, installed awesome wm and removed unity, to have something to fall back on, I also installed gnome-session-fallback. I was messing around and did the following, because the awesome wiki told me to: gconftool-2 --type bool --set /apps/nautilus/preferences/show_desktop False # Still disable the buggy Nautilus desktop thing gconftool-2 --type string --set /desktop/gnome/session/required_components/windowmanager awesome # sets awesome as wm Now here's what's wrong: I can start up decently, and then I get into a login window (that of gnome-session-fallback). I enter my username, select the preferred window manager (awesome in my case) and enter my password. It accepts these, but then hold for a second and just opens the login window again, in effect preventing me from actually logging in. I also tried gconftool-2 --unset (from the tty) on these settings, but that didn't work either. What can I do to revert the gconftool-2 settings to something that should work? I tried apt-get purging gnome-session-fallback and lightdm, and then installing them again, but that didn't work.

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• Why do Core Data sqlite table columns start with 'Z'?

  - by Dia

  I was looking at the sqlite table that Core Data generates and noticed that all table columns start with 'Z'. I realize this is an implementation detail, but I was curious as to why that's the case and if there was a design decision involved in this. Anyone happen to know or guess why? Here's a sample schema output of Core Data sqlite database: sqlite .schema CREATE TABLE ZPOST ( Z_PK INTEGER PRIMARY KEY, Z_ENT INTEGER, Z_OPT INTEGER, ZPOSTID INTEGER, ZUSER INTEGER, ZCREATEDAT TIMESTAMP, ZTEXT VARCHAR ); CREATE TABLE ZUSER ( Z_PK INTEGER PRIMARY KEY, Z_ENT INTEGER, Z_OPT INTEGER, ZUSERID INTEGER, ZAVATARIMAGEURLSTRING VARCHAR, ZUSERNAME VARCHAR ); CREATE TABLE Z_METADATA (Z_VERSION INTEGER PRIMARY KEY, Z_UUID VARCHAR(255), Z_PLIST BLOB); CREATE TABLE Z_PRIMARYKEY (Z_ENT INTEGER PRIMARY KEY, Z_NAME VARCHAR, Z_SUPER INTEGER, Z_MAX INTEGER);

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• Copy and Paste problems in Visual Studio 2010

  tweetmeme_source = 'alpascual';After installing Visual Studio 2010 I started having problems with Copy and Paste. Trying to find out how many users are being affected by this bug. The use case to reproduce the bug, just using VS2010 for a few minutes and eventually doing Control C and Control V to copy lines of code does not work. Using the menu to do the copy and paste also wont work. Looks like a problem in the clipboard itself IMHO. The set up of my computer. Windows 7 Professional with 4...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• Is it possible to construct a cube with less than 24 vertices

  - by Telanor

  I have a cube-based world like minecraft and I'm wondering if there's a way to construct a cube with less than 24 vertices so I can reduce memory usage. It doesn't seem possible to me for 2 reasons: the normals wouldn't come out right and per-face textures wouldn't work. Is this the case or am I wrong? Maybe there's some fancy new dx11 tech that can help? Edit: Just to clarify, I have 2 requirements: I need surface normals for each cube face in order to do proper lighting and I need a way to address a different indexes in a texture array for each cube face

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• Making retro games: Any good known game architectures?

  - by A.Quiroga

  I'm trying to do a remake of Snowbros . I'm doing it using libgdx but at each time i must try to thought how things got done . For example the physics of the jump and collisions . It seams to be time perfect , but i use the deltaTime to try to aproximate the value in game . I think in this case maybe its using some calcs with processor Hz , but i don't know. Then the simple question , is there any resources of how did they programm this games? Or any idea of the simple ideas repeated each game to game in the old style retro games.

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• Red Gate join the SSIS custom component club

  I recently noticed that Red Gate have launched themselves into the SSIS component market by releasing a new Data Cleanser component, albeit in beta for now. It seems to be quite a simple component, bringing together several features that you can find elsewhere, but with a suitable level  polish that you’d expect from them. String operations include find and replace with regular expressions, case formatting and trim, all of which are available today in one form or another, but will the RedGate factor appeal to people? Benefits include ease of use, all operations in one place, versus installing a custom component which many organisations do not like. I’m also interested to see where they take this and SSIS products in general, as it almost seems too simple for RedGate, a company I normally associate with more advanced problem solving. Perhaps they are just dipping a toe in the water with a simple component for now?

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• Free Webinar: Filling the Gap in SharePoint Records Management

  - by CatherineRussell

  Webinar: Filling the Gap in SharePoint Records Management Find out how you can solve your challenges with conceptClassifier for SharePoint and leverage SharePoint 2007 and 2010 in this free one hour webinar. This informative webinar will focus on records management in SharePoint and how Concept Searching’s award winning conceptClassifier for SharePoint automatically generates conceptual and descriptor metadata from documents, automatically changes the Content Type, and automatically declares records. Juan J. Celaya, President and CEO of COMPU-DATA International, LLC will share his expertise and experience using the U.S. Army’s Joint Services Records Research Center (JSRRC) as a case study and illustrates how they solved the challenge of processing millions of records to support veteran’s claims using conceptClassifier.    Webinar is on June 23rd from 11:30am – 12:30pm EST and explore real world examples of how to simplify your Records Management processes in SharePoint: http://www.clicktoattend.com/?id=149003

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• Should I just always Convert.ToInt32 my integers to account for potential nullable integers?

  - by Rowan Freeman

  If my MSSQL database contains a data type that is NULL (i.e. null is allowed) then ORMs, such as EntityFramework in my case, create .NET objects that are nullable. This is great, and the way I use nullables is like this: C# int? someInt = 5; int newInt = someInt.Value; // woot VB.NET Dim someInt As Integer? Dim newInt As Integer = someInt.Value ' hooray However, recently I had to make a change to the database to make an Id field no longer NULL (nullable). This means that .Value is now broken. This is a nuisance if the Id property is used a lot. One solution that I thought of is to just use Convert.ToInt32 on Id fields so it doesn't matter if an int is nullable or not. C# int newInt = Convert.ToInt32(someInt); // always compiles VB.NET Dim newInt As Integer = Convert.ToInt32(someInt) ' always compiles Is this a bad approach and are there any alternatives?

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• Why does java.util.ArrayList allow to add null?

  - by Alfredo O

  I wonder why java.util.ArrayList allows to add null. Is there any case where I would want to add null to an ArrayList? I am asking this question because in a project we had a bug where some code was adding nulls to the List and it was hard to spot where the bug was. Obviously a NullPointerException was thrown but not until another code tried to access the element. The problem was how to locate the code that added the null object. It would have been easier if the ArrayList throwed an exception in the code where the elements was being added.

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• Why am I am unable to open exe files?

  - by Aaron

  It doesn't matter what disk I use, it can not open the program. I keep getting the following error: Archive: /media/xxxxxxxx/INSTALL/_Setupa.exe [/media/xxxxxxxxxx/INSTALL/_Setupa.exe] End-of-central-directory signature not found. Either this file is not a zipfile, or it constitutes one disk of a multi-part archive. In the latter case the central directory and zipfile comment will be found on the last disk(s) of this archive. zipinfo: cannot find zipfile directory in one of /media/xxxxxx/INSTALL/_Setupa.exe or /media/xxxxxxxxx/INSTALL/_Setupa.exe.zip, and cannot find /media/xxxxxxxxx/INSTALL/_Setupa.exe.ZIP, period. Any ideas?

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• How to perform simple collision detection?

  - by Rob

  Imagine two squares sitting side by side, both level with the ground like so: A simple way to detect if one is hitting the other is to compare the location of each side. They are touching if all of the following are false: The right square's left side is to the right of the left square's right side. The right square's right side is to the left of the left square's left side. The right square's bottom side is above the left square's top side. The right square's top side is below the left square's bottom side. If any of those are true, the squares are not touching. But consider a case like this, where one square is at a 45 degree angle: Is there an equally simple way to determine if those squares are touching?

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• Find Nearest Object

  - by ultifinitus

  I have a fairly sizable game engine created, and I'm adding some needed features, such as this, how do I find the nearest object from a list of points? In this case, I could simply use the Pythagorean theorem to find the distance, and check the results. I know I can't simply add x and y, because that's the distance to the object, if you only took right angle turns. However I'm wondering if there's something else I could do? I also have a collision system, where essentially I turn objects into smaller objects on a smaller grid, kind of like a minimap, and only if objects exist in the same gridspace do I check for collisions, I could do the same thing, only make the gridspace larger to check for closeness. (rather than checking every. single. object) however that would take additional setup in my base class and clutter up the already cluttered object. TL;DR Question: Is there something efficient and accurate that I can use to detect which object is closest, based on a list of points and sizes?

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• Problem with sound in Kubuntu 12.10

  - by Mihkel

  I'm really enjoying Kubuntu 12.10 experience, but the problem starts with sound. It wasn't here before, but today sound sounds garbled and echoed and wrong. It happens in Audacity and VLC. It doesn't happen when I test the sound devices nor when I use Amarok to play the music files (but come on, who uses Amarok to listen to a random music file, it's much more natural to use VLC for that ;-) ) Kubuntu/Phonon recognizes 2 sound devices: 1) RV770 HDMI Audio [Radeon HD 4850/4870] Digital Stereo [HDMI] 2) Built-in Audio Analog Stereo I know it has to use the second option, and it probably does, but that's not the case. What I did find out was that I had to rescan for audio devices in Audacity (and probably select "sysdefault") for it to sound normal. Why does it happen? I've tried following some other questions, but well.

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• How Does The Maybe Monad Relate To The Option Type?

  - by Onorio Catenacci

  I was doing a presentation on F# and was discussing the Option type when someone in the audience asked me if the Option type is F#'s implementation of the maybe monad. I know that's not the case but I did want to ask how the two concepts are related. I mean it seems to me that an option type might be the result of the operation of a maybe monad but I'm not even sure of that. Would someone elucidate the relationship between the maybe monad and the option type in those functional languages which support it?

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• Installing Ubuntu before or after upgrading from Vista to Win 7?

  - by andresmh

  I just got a new SSD hard drive for my thinkpad laptop. I just installed Vista with the factory CDs. On my old OS, my main OS was Ubuntu but I do want to keep Windows on a separate partition as a dual booth system. I definitely want to upgrade to Win 7 though and I will get it in a few days. My question is: should I install Ubuntu now and then upgrade to Win 7 in a few days? or is that going to mess up with the grub (or something else)? If that is the case, then I'd rather wait to install Ubuntu until after I upgrade to Vista. P.S. I know that probably any kind of mess done by the Win upgrade could be fixed, but I just want to avoid wasting time.

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• Do you count a Masters in CS as a negative? [closed]

  - by Pete Hodgson

  In my experience interviewing developers I feel like candidates who've achieved a Masters in Comp Sci tend to be worse programmers on average that those who don't have a Masters. Is that just me, or have others noticed this phenomenon? If so, why would that be the case? UPDATE I appreciate the thoughtful comments. I think I should have been clearer in the comparison I'm making. Given two candidates who graduated from college around the same time, someone who went on to gain a Masters seems on average to be a worse programmer than someone who spent all their time in industry.

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• Do search engines rank internal redirects negatively?

  - by siverd

  A client is in the late stages (code complete) of a website redesign and unfortunately hasn't implemented 301 redirects to point high traffic pages to the new URL's. As I understand it our only option at this point is to create redirects within the CMS. Our CMS allows us to do this: www.mysite.com/category/current-page.html will redirect to www.mysite.com/new-category-name/new-page.html The site now uses custom logic on our 404 page to check this list of redirects and if one exists forwards the user to the new-page.html I understand that using 301 redirects would be the correct way to maintain our page rank but I think that would require a code change which isn't possible. Question How will search engines respond to this? Will they wait until the redirect happens and allow us to keep our page rank (authority, trust, etc) or will they see the 404 page and down-rank us? Worst case...will they make our new-page.html start from a rank of "0"? Thanks for your help.

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• Procedural Planets, Heightmaps and Textures

  - by henryprescott

  I am currently working on an OpenGL procedural planet generator. I hope to use it for a space RPG, that will not allow players to go down to the surface of a planet so I have ignored anything ROAM related. At the moment I am drawing a cube with VBOs and mapping onto a sphere. I am familiar with most fractal heightmap generating techniques and have already implemented my own version of midpoint displacement (not that useful in this case I know). My question is, what is the best way to procedurally generate the heightmap. I have looked at libnoise which allows me to make tilable heightmaps/textures, but as far as I can see I would need to generate a net like this. Leaving the tiling obvious. Could anyone advise me on the best route to take? Any input would be much appreciated.

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• Deferred contexts and inheriting state from the immediate context

  - by dreijer

  I took my first stab at using deferred contexts in DirectX 11 today. Basically, I created my deferred context using CreateDeferredContext() and then drew a simple triangle strip with it. Early on in my test application, I call OMSetRenderTargets() on the immediate context in order to render to the swap chain's back buffer. Now, after having read the documentation on MSDN about deferred contexts, I assumed that calling ExecuteCommandList() on the immediate context would execute all of the deferred commands as "an extension" to the commands that had already been executed on the immediate context, i.e. the triangle strip I rendered in the deferred context would be rendered to the swap chain's back buffer. That didn't seem to be the case, however. Instead, I had to manually pull out the immediate context's render target (using OMGetRenderTargets()) and then set it on the deferred context with OMSetRenderTargets(). Am I doing something wrong or is that the way deferred contexts work?

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• How to prevent a Gtk.SourceView from grabbing the URI of a file

  - by laboleite

  I'm making a text editor using GTK3 in Vala. I need to drag a file and, when I drop it into the application window, the application opens that file. I'm using a Gtk.Notebook that contains the Gtk.SourceView's. It works when I drop a file into an empty Gtk.Notebook, but when there is at least one Gtk.SourceView's appended on it, the SourceView grab the URI of the file, shows it and the window can't handle the opening of the file. In this case, what can I do to prevent a Gtk.SourceView from grabbing the uri of a file when I drop a file into a Gtk.SourceView. PS: I tried to use the drag_dest_unset() inside the SourceView derived class. It worked, the SourceView didn't grab the URI and the window could open the file, but the application showed a message like this, in runtime: Gtk-WARNING **: Can't set a target list on a widget until you've called gtk_drag_dest_set() to make the widget into a drag destination

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• How does "rm" on a NTFS filesystem differs from Window's own implementation?

  - by DavideRossi

  I have an external USB disk with an NTFS filesystem on it. If I remove a file from Windows and I run one of the several "undelete" utilities (say, TestDisk) I can easily recover the file (because "it's still there but it's marked as deleted"). If I remove the file from Linux no utility (unless I use a deep-search signature-based one) can recover the file. Why? How is unlink implemented in Linux's NTFS file system code? It looks like it does not just "mark it as undeleted" but it wipes away some on-disk structure, is this the case?

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• MySQL tech writer position on Oracle jobs site

  - by stefanhinz

  Just in case you missed this, last week I announced that my team is looking for an experienced technical writer. Now the job offer has gone live on the Oracle website. Have a look! That's the EMEA job site, but the position is actually available for Europe or North America. The job offer should appear on the American site soon, too. If you want to join a great team, or if you know someone suitable who does, don't hesitate to contact me!

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• I'm trying to install Bruteforce Savedata from the archiver

  - by Jonathan

  I've just installed UBUNTU 12.04 for curiosity purposes. I'm a gamer and I wanted to install Brute force Save data on my comp. So i download it and it open in the Archive manager i go to run the ".exe" but encounter this message Archive: /home/c4/Desktop/Bruteforce_Save_Data_installer.exe [/home/c4/Desktop/Bruteforce_Save_Data_installer.exe] End-of-central-directory signature not found. Either this file is not a zipfile, or it constitutes one disk of a multi-part archive. In the latter case the central directory and zipfile comment will be found on the last disk(s) of this archive. zipinfo: cannot find zipfile directory in one of /home/c4/Desktop/Bruteforce_Save_Data_installer.exe or /home/c4/Desktop/Bruteforce_Save_Data_installer.exe.zip, and cannot find /home/c4/Desktop/Bruteforce_Save_Data_installer.exe.ZIP, period. Please help!

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