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• Scalability of multi-threading in game server

  - by Taylor Hill

  What is a reasonable number of threads for a simple 2D mmo in Java? Is it reasonable to have two threads per connection, one for the input stream and one for the output stream? The reason I ask is because I use a blocking method on the input stream, and a workaround seems unnecessarily complex if I were to try to get around it without adding threads. This is mostly for my own edification; I don't expect to have 5 million people playing it ever, or even 5, but I'm wondering what a good scalable solution is, and if this is reasonable for a small server (<30 connections).

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• iOS App Store Under 18 - Post via private limited company? [closed]

  - by jskidd3

  I'm 17 years old and wish to post an application on the iOS App Store. My situation is a little different to other users doing the same thing, though. I'm finding this very frustrating. It's very annoying that Apple don't let younger talent post themselves. Is it true that if I do post under my Father's name I can choose a different name to be listed on the app store? I want to keep this professional, I don't want my father's name to appear underneath the application on the store. :P I have registered myself as the company director of a private limited company. Even though I'm the only one in the company, is this a way to bypass the 18+ restriction or do I need a minimum of 2 employees? Why the hell has this been closed? Thanks

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• 44 Tips for Front End Web Devs (Part 1)

  - by Geertjan

  HTML, JavaScript, and CSS development in NetBeans IDE is fairly new, especially the integrated features of all the editors with the browser. In this screencast, newbies (and even those who have used NetBeans for many years) get a series of tips and insights into using NetBeans IDE in the context of HTML5 development. For example, useful keyboard shortcuts, plugins such as Emmet, and much much more is covered: Part 2 of this series, which is also the final part, is set to be published tomorrow. Note: The outline of the screencast is found in yesterday's blog entry!

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• How do you usually manage callbacks in Java using Swing library?

  - by none

  I'm quite new to the Java Swing programming, and GUI development as well. As a beginner, I'm currently reading Design Pattern, but finding what I'm looking for is quite hard, most of the times. So far, I've never had huge problems defining a view hierarchy - I just use to subclass component from component. But the hard-to-do here is how managing callbacks, which often become hard to maintain due to the hard code. During my last projects, I tried to separate GUI, Listener and Callbacker objects which cooperated together, but in this way it was really hard adding new features. So, which kind of best patterns or best practices do you tend to use when trying to maintain, add new features or even worst avoid to hard-code classes which manage callbacks method in this kind of frameworks (mainly Java Swing)?

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• Triangles in a C++ STL Vector as an Objective-C member sometimes draws incorrectly in OpenGL ES

  - by Rahil627

  The polygons draw correctly 80% of the time. When it fails, a vertex is dislocated. The polygon is consistently drawn with the wrong vertex. I checked that the vector is correct during initialization, even when it's wrongly drawn. I'm using Cocos2d. The class member: @interface Polygon : CCSprite { std::vector<float> triangleVertices; } The draw function called in [Polygon draw]: + (void)drawTrianglesWithVertices:(const std::vector<float> &)v { //glEnableClientState(GL_VERTEX_ARRAY); glDisable(GL_TEXTURE_2D); glDisableClientState(GL_TEXTURE_COORD_ARRAY); glDisableClientState(GL_COLOR_ARRAY); glVertexPointer(2, GL_FLOAT, 0, &v[0]); glDrawArrays(GL_TRIANGLES, 0, v.size()); //glDisableClientState(GL_VERTEX_ARRAY); glEnableClientState(GL_COLOR_ARRAY); glEnableClientState(GL_TEXTURE_COORD_ARRAY); glEnable(GL_TEXTURE_2D); } Any ideas?

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• No sound coming from HDMI

  - by cypwrx

  (Ubuntu 12.04 x64) After looking at other questions (here and other sites) and trying their respective answers, I am still unable to get the hdmi audio out working. I have downloaded the recommended hardware drivers for my card (radeon hd 4350), made sure that the card is not muted in alsamixer, and set it as the correct output device in sound settings. I have also disabled the onboard sound devices in the bios menu. In aplay -l, it shows my hdmi card as hw:0,3 Even after doing sound tests I still cannot hear anything. Any suggestions? Not sure where to go from here, I am fairly new to linux.

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• The shortest licenses

  - by Darek Nedza

  What are the shortest licenses with aims for programmers/code. I have found only MIT that is page-long. What are other licenses that have approximately the same length or even shorter? Edit: Ok, length is not only criteria(I haven't expected one-line licenses, I have understaminate you people). I need easy to read and short licenses. It is meant for people who want to use my code not for lawyers who want to read long licenses. I am creating small codes to use by most people probably free of charge. I don't want useless information to be required, for example: what is X(for example: what is software, source code etc.) very specific information(for example: you can use it shop, opera, school... free of charge; but instead "use it everywhere but don't take money" Depending on type of code I would like to allow/disallow commercial usage.

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• How do I get a Realtek Wireless USB Airlink101 AWLL5088 working?

  - by Tobias_Mann

  I am running Ubuntu 11.10, 32bit. I ordered them a Realtek Airlink101 AWLL5088 based upon the relative ease for linux installation. I am having trouble installing the drivers. I copied the drivers to /usr/src/ and ran sudo ./install.sh from that director listed above. I have tried ndiswrapper, and allowing the default drivers, but with no luck. It seems to continue to try and use the default free drivers, even though I have blacklisted them using the guide described here. There was no error, I was asked which card I was using. I looked at the packaging and at the support page, and guessed number 2, allowed to finish, and rebooted. It continued detect the wireless network after the reboot, but would never complete the connection. I would appreciate any feedback. I am kind of stuck trying to figure this out.

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• CPU spikes cause audio stuttering in Audacious when browsing? (Lubuntu)

  - by Alucai Vivorvel

  My default audio player is Audacious, browser Google Chrome. I tried Firefox, and while I love it, the CPU load spikes when doing something as simple and small and switching a tab, which causes the audio playing to stutter (as sound is onboard and handled thru the CPU). Chrome doesn't do this as much, but there is the occasional stuttering when browsing, which is ridiculous, as not even Windows Vista does this. So I thought maybe it's something to do with how Lubuntu handles sound, I checked and only ALSA was installed. I tried installing PulseAudio, but, while the music "plays", nothing comes through the speakers. Immediately after switching back to ALSA the music pours out of them. So I was wondering if you had any idea what was going on here. I asked on Ubuntu Forums but apparently my problem is too complex, as it's been over a week since the last reply. Specs are: AMD Athlon 64 3200+ @ 2GHz 2GB Corsair 667MHz DDR2 RAM ATi HD Radeon 3650 (AGP) 512MB 500W Cooler Master PSU 80GB SATA II HDD (Vista is installed on 500GB drive) Biostar K8M800 Motherboard

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• Do ALL your variables need to be declared private?

  - by shovonr

  I know that it's best practice to stay safe, and that we should always prevent others from directly accessing a class' properties. I hear this all the time from university professors, and I also see this all the time in a lot of source code released on the App Hub. In fact, professors say that they will actually take marks off for every variable that gets declared public. Now, this leaves me always declaring variables as private. No matter what. Even if each of these variables were to have both a getter and a setter. But here's the problem: it's tedious work. I tend to quickly loose interest in a project every time I need to have a variable in a class that could have simply been declared public instead of private with a getter and a setter. So my question is, do I really need to declare all my variables private? Or could I declare some variables public whenever they require both a getter and a setter?

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• Why isn't my touchpad behaving like said in synclient?

  - by pirad

  I use a small skript to get my touchpad doing what it should: synclient LockedDrags=1 PalmDetect=1 PalmMinWidth=200 RightEdge=5340 VertTwoFingerScroll=1 HorizTwoFingerScroll=0 VertEdgeScroll=0 CoastingSpeed=0 LeftEdge=1800 TopEdge=1900 CircularScrolling=1 CircScrollDelta=0.2 CircScrollTrigger=3 TapButton1=1 TapButton3=3 TapButton2=2 & syndaemon -i 1.3 -d -t -R -k And when running synclient everything looks fine. But when I try to scoll, or tap nothing happens. Even after running killall syndaemon nothing happens. Has anybody an idea? I also have a trackpoint. edit: One problem is: It worked at some point on my system (wich I installed just yesterday= but then something changed and I don't know what and since then it doesn't work any more. edit2: Here's the xorg-log part about touchpads: http://paste.ubuntu.com/1042995/

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• And again... VMware Player 4.0.4 on Ubuntu 12.04 (Precise Pangolin)

  Even with the new version of VMware Player 4.0.4 you are still required to patch their sources. So, same game as last month. Just changing the value of the required version in the kernel patch script of Stefano Angeleri (weltall) and you are done: nano patch-modules_3.2.0.sh Please change line 8 at the top of the script like so: plreqver=4.0.4 Save your modification and then run the following commands: sudo rm /usr/lib/vmware/modules/source/.patchedsudo ./patch-modules_3.2.0.shsudo service vmware restart And again, on first start VMware will present you their EULA which you have to accept, and everything gets back to normal operation mode. Interestingly, one day ago the Ubuntu repositories provided a newer kernel version 3.2.0-25, so everything is running fine for now.

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• Software Center won't take into account my changed OpenID name: any idea?

  - by Pascal Av

  Failing to install IntelliJ from the Software Center, I realized my login is wrong in the /etc/apt/auth.conf entry that the install process generates. In this file, I see my original OpenID, that's the one which got automatically generated when signing up on Launchpad. It contains my last name so I changed it. I purged conf and binaries for Ubuntu One, reinstalled, deleted all listed "Devices" from app, all "Applications" from Launchpad. Deleted ~/.cache/software-center/, reboot, but still: When installing IntelliJ, the auth.conf file receives my original OpenID, not the modified one Problem is that the commercial subscription, for IntelliJ private PPA, uses my modified OpenID, so authentication attempt fails. I can't remove nor modify this subscription, even by changing back my OpenID into Launchpad. Any idea to solve this?

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• Why creating a new MDX language instead of extending SQL?

  - by DReispt

  I have a long experience with SQL, but recently began working with datawarehouse and OLAP technologies: building fact and dimension tables, that then are queried using MDX (MultiDimensional eXpressions). The problem is that MDX works with a completely different logic compared to SQL, and it's a whole new learning curve even for someone with a strong SQL background. Yes, MDX allows you to do things that would be hard or almost impossible with plain SQL. But sometimes it's frustrating to be hours around an MDX to do something you know you could achieve in minutes using SQL (ok, you can tell me to RTFM ...). But why go on to the trouble of creating a new completely different language when you could build on SQL, extend it to add the features needed by OLAP applications?

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• Does facebook store multiple password hashes for each user?

  - by loxxy

  I noticed that Facebook allows multiple variants of my own password : My password as it is. My password with first letter capitalized. My password with all letters capitalized. It is commonly known that passwords are stored as hashes. So my question is, does facebook store multiple hashes for each user? Since the hash of each variant should be completely different... Or am I missing something, here? And there may be more combinations, besides the one I observed as well. This is obviously done to provide a better user experience & they probably have a statistical explanation of people repeating these mistakes. But I could not help but wonder, is it worth to increase so many lookups (in their database) just to help the user type a wrong password? On top of this, they warn about the caps lock (even though they don't seem to care) :

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• How can you monitor internet download usage?

  - by dv3500ea

  Some broadband providers impose a monthly download limit, charging extra if you go over. It is also quite easy to exceed some of the lower limits just by installing/updating packages and 'normal' browsing (which to me includes streaming TV programs and movies). This means that you need to limit the amount you use the internet, yet it is hard to know when. The System Monitor helps a bit with this by giving a total received/total sent in the networking section of the Resources tab. However, this is reset every reboot. It would be good if there was a way to have a monthly total received so you can know how close you are to exceeding your limit and maybe even be given warnings if it looks like you are going to exceed the limits. Does anyone know of a way to achieve this?

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• confusion understanding the fluid 2 column navigation layout

  - by Jason Madux

  I'm trying to understand the following cross-browser layout: http://matthewjamestaylor.com/blog/perfect-2-column-left-menu.htm but I'm having some confusion with some of its parts and there isn't enough information on the page or in the css comments to help me. What is the purpose of the .colleft div? Why can't the 2 columns be directly under the .colmask container? Why does the .colleft div have a right 75%? I don't understand its purpose/benefit. Why don't the widths of .col1 and .col2 add up to 100%? How was left:102% calculated for .col1 and left:6% for .col2? The comments for this are not very clear to me. How is it any different from not even specifiying a left/right css property?

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• Is this CPU usage normal for Xorg?

  - by Samuaz

  I checked System Monitor to see if the frequency of my CPU increases without doing anything and saw that xorg is always using 10-40% of the CPU even if it's not doing much of anything on the desktop or simply surfing the Internet. Is this normal? If not, how can I fix it? I have: a Macbook white 4,1 Core2 Duo running at 2.10 GHz GPU Intel GMA X3100 4GB of RAM Ubuntu 11.04 I am running Unity and I do not have many effects enabled. I have only activated Compiz animations, scale, desktop, some shadows...

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• How would you tackle a pattern-finding program?

  - by Neil

  Just to be clear, I don't think this should be question better suited for stackoverflow.com simply because there's not a single answer but a wide range of possible solutions, making this question far more subjective in nature. I was curious how you guys would tackle a pattern-finding program, which is to say I'd do the following operations: I enter in some input. Program predicts my next input based on all previous inputs. Rinse. Repeat. Since the amount of input I could provide is so varied, including empty strings, conventional means such as switches or regular expressions are out, since it would require you to have an inkling of information about what to expect. I was thinking about some form of genetic algorithm, yet even then I don't have a clue as to how to approach a problem of this caliber. I think some feedback mechanism would be necessary as well as to let the program know how close it was. Anyone had to do a similar type program before?

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• Android Java: Way to effectively pause system time while debugging?

  - by TheMaster42

  In my project, I call nanoTime and use that to get a deltaTime which I pass to my entities and animations. However, while debugging (for example, stepping through my code), the system time on my phone is happily chugging along, so it's impossible to look at, say, two sequential frames of data in the debugger (since by the time I'm done looking at the first frame, the system time has continued to move ahead by seconds or even minutes). Is there a programming practice or method to pause the system clock (or a way for my code to intercept and fake my deltaTime) whenever I pause execution from the debugger? Additional Information: I'm using Eclipse Classic with the ADT plugin and a Samsung SII, coding in Java. My code invoking nanoTime: http://pastebin.com/0ZciyBtN I do all display via a Canvas object (2D sprites and animations).

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• Networking Icon Keeps Disappearing

  - by Zelda64fan

  Almost every time I unlock my computer the networking icon and the Bluetooth icons are missing from the panel. They also disappear if I disable networking with the 'hardware switch', even though before they would just switch to a 'disabled' look. I know I can get the networking one back by running nm-applet, but I'd rather just find a way to make it stop disappearing. What causes this? This is on 12.10 64-bit, if it matters. UPDATE: I ran it from terminal, and got this: $ nm-applet ** Message: applet now removed from the notification area ** Message: PID 31340 (we are 28924) sent signal 15, shutting down... And then it exited. So it thinks it's supposed to quit...? I haven't been able to figure out what process had that ID.

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• Free & Open Source XML Editor Built on Maven

  - by Geertjan

  Here you can download the sources of an XML Editor that uses libraries from NetBeans IDE 7.3 Beta 2 as its basis, while using Maven as its build system: http://java.net/projects/nb-api-samples/sources/api-samples/show/versions/7.3/misc/XMLEditorInMavenNBRCP And here's what it looks like to the user: Note: The Favorites window has been rebranded as "File Browser" and Nimbus is used for the look and feel, thanks to a .conf file that is registered in the POM of the application project.  The cool part is that I didn't type one line of code to get the above result and that only those pieces that an XML Editor actually needs are included in the application, though it could be pruned even further.

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• Capslock as modifier key for AutoKey

  - by nil

  I want to use Capslock as a modifier key for AutoKey shortcuts, and I've successfully remapped it to its own custom key using the terminal command xmodmap -e 'clear Lock' -e 'keycode 66 = F13'. However, AutoKey seems to only allow the modifiers Ctrl Shift Alt Super when setting shortcuts. As a work-around, could I somehow define the shortcuts within the script itself? Would this even be the most efficient work-around? P.S. I found a relevant page, though I'm not exactly sure how to implement it. P.P.S. I found a cheap way to do this by mapping Capslock to Shift+Alt and then setting all appropriate shortcuts in AutoKey with the modifier Shift+Alt. However, I'd really prefer having Capslock as its own modifier. Any help would be appreciated.

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• Big delay to open web pages on Ubuntu 11.10; also slow torrent client speed

  - by user54234

  The keywords for my issue are too common among other issues, so, I couldn't find anything that could answer me: why will it take around 30+ seconds for any of my browsers to open a page? happens even with google.com... with both Firefox and Chromium. This does not happen while I use Windows, from exactly the same point at my house (I've got enough wi-fi signal here for sure). Also, the standard torrent client won't hit the max download speed... I can hit 1 Mb/s with utorrent on Windows, and can't go over 300 kbps here. I tried changing the program settings, no results. Please help me. I REALLY don't wanna go back to Windows. Thanks in advance, I admire this community, and I'm sorry that I couldn't find something that could help me. I already solved a lot of issues without asking, but couldn't do it this time.

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• How do I forward/redirect a website from a folder in a subdomain to another server?

  - by dozza

  I have a client with a site at: subdomain.theirdomain.com/folder It's a 50Gb gallery site that i've now cloned and have locally in MAMP. Once i've made some changes to it I need to host it at alternative physical server/hosting (I intend using a dedicated server I have access to with a technical domain name currently). However, the client would ideally like to keep the existing URL as it has been used extensively in marketing. I've done HTTP redirects and forwards and 301 redirects in the past, but I'm not sure how or even if I can do what the client wants. How can I achieve this, possibly using .htaccess and DNS entries? Caveats: I can't have the site at a 3rd party domain and the client isn't able/allowed to register any additional domains:

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