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Articles indexed in March 2012

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• creative & complex vs simple and readable

  - by Shirish11

  Which is a better option? Its not always that when you have something creative your code is going to look ugly. But at times it does go a bit ugly. e.g. if ( (object1(0)==object2(0) && (object1(1)==object2(1) && (object1(2)==object2(2) && (object1(3)==object2(3)){ retval = true; else retval = false; is simple and readable bool retValue = (object1(0)==object2(0)) && (object1(1)==object2(1)) && (object1(2)==object2(2)) && (object1(3)==object2(3)); but having something like this will make some newbies scratch their heads. So what do I go for? including simple code everywhere might sometime hamper my performance. what I could think of was commenting wherever necessary but at times u get too curious to know what is actually happening. Any suggestions are welcome.

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• How to deal with transactions when creating a database connection for each query

  - by webnoob

  In line with this post here I am going to change my website to create a connection per query to take advantage of .NET's connection pooling. With this in mind, I don't know how I should deal with transactions. At the moment I do something like (psuedo code): GlobalTransaction = GlobalDBConnection.BeginTransaction(); try { ExecSQL("insert into table ..") ExecSQL("update some_table ..") .... GlobalTransaction.Commit(); }catch{ GlobalTransaction.Rollback(); throw; } ExecSQL would be like this: using (SqlCommand Command = GlobalDBConnection.CreateCommand()) { Command.Connection = GlobalDBConnection; Command.Transaction = GlobalTransaction; Command.CommandText = SQLStr; Command.ExecuteNonQuery(); } I'm not quite sure how to change this concept to deal with transactions if the connection is created within ExecSQL because I would want the transaction to be shared between both the insert and update routines.

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• Using macro as an abstraction layer

  - by tehnyit

  I am having a discussion with a colleague about using macro as a thin (extremely) layer of abstraction vs using a function wrapper. The example that I used is Macro way. #define StartOSTimer(period) (microTimerStart(period)) Function wrapper method void StartOSTimer(period) { microTimerStart(period); } Personally, I liked the second method as it allows for future modification, the #include dependencies are also abstracted as well.

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• Why learning new things is not important on a job hunt? [closed]

  - by IAdapter

  I have just finished my job hunt. I think it was about 40 job interviews, I like to travel and get to know many companies. One thing I did not like is that they don't care about new technologies. I think only 2 persons asked me about new stuff in Java world. Most of them care if I know Java (certification and many years of experiance is not enough for them, they need to test me) For example in IBM they only cared what IBM products do I know. Have I ever used any custom extensions of WebSphere? I don't understand those questions. If I learn new frameworks every day then I can learn whatever technology they have very fast. So why it matters if I have ever used those "great" custom extensions of WebSphere? After those 40 interviews I have no reason to learn any new framework, because I see that they don't care. Why those "developers" don't ask questions about new technologies? are they so long at those comapnies that they don't care about new stuff?

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• Design in "mixed" languages: object oriented design or functional programming?

  - by dema80

  In the past few years, the languages I like to use are becoming more and more "functional". I now use languages that are a sort of "hybrid": C#, F#, Scala. I like to design my application using classes that correspond to the domain objects, and use functional features where this makes coding easier, more coincise and safer (especially when operating on collections or when passing functions). However the two worlds "clash" when coming to design patterns. The specific example I faced recently is the Observer pattern. I want a producer to notify some other code (the "consumers/observers", say a DB storage, a logger, and so on) when an item is created or changed. I initially did it "functionally" like this: producer.foo(item => { updateItemInDb(item); insertLog(item) }) // calls the function passed as argument as an item is processed But I'm now wondering if I should use a more "OO" approach: interface IItemObserver { onNotify(Item) } class DBObserver : IItemObserver ... class LogObserver: IItemObserver ... producer.addObserver(new DBObserver) producer.addObserver(new LogObserver) producer.foo() //calls observer in a loop Which are the pro and con of the two approach? I once heard a FP guru say that design patterns are there only because of the limitations of the language, and that's why there are so few in functional languages. Maybe this could be an example of it? EDIT: In my particular scenario I don't need it, but.. how would you implement removal and addition of "observers" in the functional way? (I.e. how would you implement all the functionalities in the pattern?) Just passing a new function, for example?

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• Creating database connections - Do it once or for each query?

  - by webnoob

  At the moment I create a database connection when my web page is first loaded. I then process the page and run any queries against that conection. Is this the best way to do it or should I be creating a database connection each time I run a query? p.s It makes more sense to me to create 1 connection and use it but I don't know if this can cause any other issues. I am using C# (ASP.NET) with MSSQL.

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• design for supporting entities with images

  - by brainydexter

  I have multiple entities like Hotels, Destination Cities etc which can contain images. The way I have my system setup right now is, I think of all the images belonging to this universal set (a table in the DB contains filePaths to all the images). When I have to add an image to an entity, I see if the entity exists in this universal set of images. If it exists, attach the reference to this image, else create a new image. E.g.: class ImageEntityHibernateDAO { public void addImageToEntity(IContainImage entity, String filePath, String title, String altText) { ImageEntity image = this.getImage(filePath); if (image == null) image = new ImageEntity(filePath, title, altText); getSession().beginTransaction(); entity.getImages().add(image); getSession().getTransaction().commit(); } } My question is: Earlier I had to write this code for each entity (and each entity would have a Set collection). So, instead of re-writing the same code, I created the following interface: public interface IContainImage { Set<ImageEntity> getImages(); } Entities which have image collections also implements IContainImage interface. Now, for any entity that needs to support adding Image functionality, all I have to invoke from the DAO looks something like this: // in DestinationDAO::addImageToDestination { imageDao.addImageToEntity(destination, imageFileName, imageTitle, imageAltText); // in HotelDAO::addImageToHotel { imageDao.addImageToEntity(hotel, imageFileName, imageTitle, imageAltText); It'd be great help if someone can provide me some critique on this design ? Are there any serious flaws that I'm not seeing right away ?

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• Who uses GnuSTEP?

  - by adib

  This has been a big question lurking at the back of my head. From what I see, GnuSTEP nowadays is primarily a "hobby" project of a small but tightly-knit group of people. However I haven't seen a large commercial (off-the-shelf) application that uses it, apart from the small applications that comes with the GnuSTEP distribution. Heck, since even Ubuntu doesn't really use it then is GnuSTEP really more than being a "hobby" framework? I know that Sony's SNAP at one brief moment uses GnuSTEP, but they killed the platform before it can do anything meaningful.

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• How can a computer render a CLI/console along with a GUI?

  - by Nathaniel Bennett

  I'm confused when looking into graphics - specifically with operating systems. I mean, how can a computer render a CLI/console along with a GUI? GUI's are completely different from text. And how can we have GUI windows that display text interfaces, ie how can we have CLI in modern Graphics Operating system - that's what I'm mainly trying to grip on to. How does graphics get rendered to display? Is there some sort of memory address that a GPU access which holds all pixel data, and there system's within OS's that gather the pixel position of windows and widgets, along with the Z Index and rasterize them to that memory address, which then the GPU loads to the screen? How about the CLI's integrated with Graphics? How does the OS tell the GPU that a certain part of the screen wants to display text while the rest wants to display pixel data?

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• DI/IoC in Java for a .NET'er used to Castle.Windsor

  - by Ciddan

  Is there a Java DI container that works in a similar way to the most excellent Castle.Windsor container on the .NET side? The Java containers I've had a look at all seem to rely on annotations (Guice) within my services, which I don't dig all that much - I'd like to go POJO all the way if possible. Spring on the other hand can do without the annotations, but it requires a lot of XML. XML configuration != maintainability. One of the really nice things about Castle.Windsor is the wiring you're able to set up in code with Installers, auto wiring based on naming conventions and whatnot. Ideally the container should also support lifecycle management and configuration; i.e. registering components as transient, singleton, pooled etc. Another bonus would be support for interceptors. Any tips would be greatly appreciated.

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• Android edittext right align [closed]

  - by Yoav

  I am using my application with hebrew (right-to-left) layout. I have a feature where I open an activity with EditText in it - where I put some text (previously entered by the user) to be edited by him. However, when I do setText I find out that the text is aligned to the left of the edittext instead of of the right. (If I start with empty edittext then it is automatically right aligned when user starts inputting hebrew, but cursor is positioned to the left) (android:gravity="right" does not work)

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• Ubuntu take hours to start!

  - by y2b4u3d

  I have installed Ubuntu 11.10 as my only OS after I formatted Windows XP but after the installation finished it took four hours to boot and start working it just was stuck in that purple screen with nothing on it!!! But if I unplug the power and start my PC again it start after bring me the grub option... What should I do to make em start just as easy as any OS do! my RAM is 1 GB, 80GB HDD, ASROCK.

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• Black screen with thinkpad edge e525, AMD radeon HD before and after installation, plymouth?

  - by carolien

  I have a new thinkpad edge e525 (which should work) and wanted to try ubuntu (first linux experience). With the ubuntu desktop-cd I had a blackscreen before installation, I could fix that with nomodeset. After the installation, when rebooting I got the black screen again. First I see some ubuntu colour with a green busted stripe. I have the same problem with the live boot, also tried mint live, the stripe gets pink. I installed xubuntu 64bit from an alternate cd and I didnt have problems until de reboot after the installation. Same problem, just a black screen with the green stripe than blackscreen. I tried several things: adding nomodeset to the bootmenu, but than I get: No connection to plymouth and it is stuck at checking the battery status. I tried to replace quiet splash with text. Didnt work either. actually one time I saw a blue booting image before that. I managed to get a root command though via the recovery boot. I didnt dare to just remove the plymouth package. Can I just delete plymouth or do I have to deinstall it as described in several ways. (Problem is, right now the notebook doesnt have a internet connection. And I dont know how to manage it with a usb stick?) Or do I have to install the AMD catalyst driver manually? (Again, how can I do that with an usb stick) I also tried this: Ubuntu hits a black screen after boot. Is there any solution without internet? And if I need internet which is the right one? Please explain step by step what I have to write and so on! Thank you! also tried: set gfxpayload=text and: just remove splash and adding vesafb.nonsense=1 to the grub editor, because I couldnt find it anywhere

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• How can I change the language order by command-line (or text editor)?

  - by KIAaze

  How can I change the language order by command-line (or text editor)? i.e. without using the graphical "gnome-language-selector". (Or is there a better GUI which allows you to select multiple language entries and move them all to another position directly, without having to do it one by one?) Alternatively: Where are the user-specific language settings stored? i.e. the /etc/default/locale for users.

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• Adjust resolution in xfce4 virtualbox guest guest

  - by David

  I have Virtualbox 4.1.2_ubuntur3859 installed on an Ubuntu 11.10 host, running a guest ubuntu server 10.04 with xfce4 and xorg installed with no-install-recommends. I have installed guest additions, but the maximum resolution in the display settings is 800x600. I have read related questions: How to change resolution of the VirtualBox (Ubuntu guest and host)? Higher screen resolution in VirtualBox? upgrading VirtualBox 3.2.10 breaks my guest Ubuntu screen resolution Ubuntu as guest OS (with Vista host) stuck at 800x600 resolution but none contain the solution to my issue. Am I missing any particular packages that would allow me to change resolution? I would like to keep the machine as small as possible.

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• How to Disable Touchpad tap in Toshiba Tecra R850 in Oneiric

  - by Kibi

  I know there's a lot of similar questions, but nothing I have tried here works yet - perhaps I was doing it wrong. New Laptop - Toshiba Tecra R850 with an install of Oneiric. Mostly things are working well, but I have a problem with the touchpad (or whatever it's called) - whenever I use it for moving the mouse pointer I accidentally tap on it - basically I am clicking all over the place by accident. So I want to disable the tap-as-click (after all, I have buttons for clicks too). I open up "Mouse and Touchpad" and on the Touchpad tab I check "Disable touchpad when typing" and UNcheck "Enable mouse clicks with touchpad". This does not achieve anything. The only piece of code I had which worked at all was to completely disable the touchpad by removing the driver - but that is no use since I WANT the mousing ability, just not the tap. In fact, even that would be good if I could still use the little blue stick thing and the other buttons - but it disabled them too. Tried installing touchpad indicator but it didn't seem to want to install. There were suggestions to put stuff into /usr/share/X11/xorg.conf.d so I edited 50-synaptics.conf and added the line Option "TapButton1" "0" But it didn't work and I'm not surprised since the place, syntax and values were all a guess really... Any ideas? This is really annoying. Thanks Kibi

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• Run two shell file with thread

  - by user1149157

  How i can run two file shell in parallel and do not shared the same jvm. may be i use thread but how i run two file shell bu two thread ? File 1: #!/bin/bash # # Script for running several experimentations one the same JVM # Usage : TRACE_DIR NB_EXPE Factories... # param="parameter1" another="parameter2" for ((i = 10; i >= 0; i -= 1)) do echo "run my file with param another " done File 2 : #!/bin/bash # # Script for running several experimentations one the same JVM # Usage : TRACE_DIR NB_EXPE Factories... # a="101" b="400" c="500" echo "run my programme with a b c "

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• Ubuntu server 11.04 recognize only 1 core instead of 4

  - by Kreker

  I searched for other questions and googled a lot but I don't find a solution for solving this problem. Ubuntu Server 11.04 64bit installed on Dell Poweredge with Intel Xeon X5450. He only recognize 1 of the 4 cores I have. Tried to modify the GRUB config but didn't work. IN the machine BIOS I didn't find anything useful. CPU root@darwin:~# cat /proc/cpuinfo processor : 0 vendor_id : GenuineIntel cpu family : 6 model : 23 model name : Intel(R) Xeon(R) CPU X5450 @ 3.00GHz stepping : 10 cpu MHz : 2992.180 cache size : 6144 KB physical id : 0 siblings : 1 core id : 0 cpu cores : 1 apicid : 0 initial apicid : 0 fpu : yes fpu_exception : yes cpuid level : 13 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx lm constant_tsc arch_perfmon pebs bts rep_good nopl aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm dca sse4_1 xsave lahf_lm dts tpr_shadow vnmi flexpriority bogomips : 5984.36 clflush size : 64 cache_alignment : 64 address sizes : 38 bits physical, 48 bits virtual power management: GRUB root@darwin:~# cat /etc/default/grub # If you change this file, run 'update-grub' afterwards to update # /boot/grub/grub.cfg. # For full documentation of the options in this file, see: # info -f grub -n 'Simple configuration' GRUB_DEFAULT=0 #GRUB_HIDDEN_TIMEOUT=0 GRUB_HIDDEN_TIMEOUT_QUIET=true GRUB_TIMEOUT=2 GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian` GRUB_CMDLINE_LINUX_DEFAULT="" GRUB_CMDLINE_LINUX="noapic nolapic" #was with acpi=off # Uncomment to enable BadRAM filtering, modify to suit your needs # This works with Linux (no patch required) and with any kernel that obtains # the memory map information from GRUB (GNU Mach, kernel of FreeBSD ...) #GRUB_BADRAM="0x01234567,0xfefefefe,0x89abcdef,0xefefefef" # Uncomment to disable graphical terminal (grub-pc only) #GRUB_TERMINAL=console # The resolution used on graphical terminal # note that you can use only modes which your graphic card supports via VBE # you can see them in real GRUB with the command `vbeinfo' #GRUB_GFXMODE=640x480 # Uncomment if you don't want GRUB to pass "root=UUID=xxx" parameter to Linux #GRUB_DISABLE_LINUX_UUID=true # Uncomment to disable generation of recovery mode menu entries #GRUB_DISABLE_RECOVERY="true" # Uncomment to get a beep at grub start #GRUB_INIT_TUNE="480 440 1" Complete dmesg Too long, posted on pastebin http://pastebin.com/bsKPBhzu

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• How do I access and enable more icons to be in the system tray?

  - by Jon

  So I'm messing around with Natty a little, and I noticed that all the apps that would normally use the system tray (or "notification area"?) aren't displaying there. Is that a bug, or is that the way it's going to be? I heard something about Ubuntu getting rid of that feature entirely. Is there a way to add it back? I mean, I didn't really like it, either, especially when there were apps that used it unnecessarily, but I can't use CryptKeeper at all now, or easycrypt, and I don't know whether Dropbox has synced without opening Nautilus.

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• Cannot sleep/standby in Ubuntu 12.04

  - by mstaessen

  Yesterday, I installed Ubuntu 12.04 Desktop i386 on my netbook (HP Mini 311c). I am unable to use the sleep mode. When I press the suspend button (or do sudo pm-suspend), the screen flickers but the computer does not power off. Even worse, the screen comes back up and I'm back where I left off. Hibernating does work (although it is not available in Power Management). I have to use pm-hibernate to make that work. I'm using the 3.2.0.20 kernel and Gnome 3.3.92 (Unity, especially compiz, is a resource hog). Before Ubuntu 12.04, I was using Mint Linux 12 with the 3.0 kernel and everything worked fine back then. Any help is much appreciated because this is driving me crazy.

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• Slow internet connection with mobile broadband

  - by Prasad

  I'm using a Huawei 156g USB stick to connect to the internet. In windows it reacts lightning fast and loads pages faster than my Ubuntu 10.10 does, It's not the connection type (HSDPA, WCDMA or gsm) it takes more time to connect, download speed seems okay (But not full speed i think) what is the matter with it? do I need to install some kind of drivers for it? I'm not behind a proxy. please help, I just searched around ask Ubuntu and nothing matched my problem :-(

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• How can I restore a corrupted Shotwell db?

  - by Yann Dìnendal

  While I was importing photos from a SD card in Shotwell, my laptop has crashed (shutdown because of over-heating). Now, I can no longer launch Shotwell: $ shotwell ** ERROR:x86_64-linux-gnu/db/VersionTable.c:104:version_table_construct: assertion failed: (res == SQLITE_OK) If I move the .db file ~/.shotwell/data/photo.db elsewhere so it is no longer present (but backed-up), shotwell will launch, but will rebuild its library, which will be empty. I can re-import the folders shotwell creates, but I lose nearly all meta-data (most importantly the "folders", or events, and their main picture) Is there a way to repair/rebuild/restore photo.db? How can I see what's inside? how bad it's damaged? Or is there another way to get back my events and imports?

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• Ubuntu cannot boot after kernel upgrade

  - by andrey

  Today I have upgraded the Linux kernel (using the Update Manager), from 3.0.0.16-generic to 3.0.0.17-generic. However, after this update, Ubuntu 11.10 cannot boot anymore. I see a strange message which says "initclt: event failed". And if I press [Ctrl]+[Alt]+[F1] it still allows me to log into the text mode. But if I type sudo lightdm, I cannot log into the graphical mode. However, if I choose to boot an older kernel from the GRUB, Ubuntu boots correctly. What should I do, in order to be able to boot the system using the new kernel?

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• How to change default boot with two Ubuntus?

  - by d3vid

  I currently have 11.10 and 12.04 Beta running side-by-side. Since installing the beta, I am presented with a GRUB2 menu every time I boot up, which selects 12.04 by default. (Aside: when the 11.10 kernel updated from 3.0.0-16 to 3.0.0-17 this option did not appear in the GRUB2 menu.) When I open Grub Customizer in 11.10, it shows 11.10 kernel 3.0.0-17 as the default, when I open Grub Customizer in 12.04, it shows 12.04 as the default. How can I change GRUB2 to pick the latest 11.10 kernel as the default? (Latest means that if 3.0.0-18 is released it will become the default, and so on.) And also stop displaying the menu (I only boot into the beta when I have something specific to test). Generic answers that apply to any two Ubuntus running side-by-side are preferred.

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• Blank screen during boot after clean Ubuntu 11.10 install (Intel N10 graphics)

  - by Coen

  After a clean install of Ubuntu 11.10 on my Asus eee PC 1005p, Ubuntu seems to boot correctly, except for initialization of the LCD screen. What I observe: I choose Ubuntu 11.10 in the GRUB 2 menu A blank screen with a blinking cursor in the top left of the screen, for 15-20 seconds. The ubuntu logo with 5 red dots in the center of the screen, for 1 second. The LCD screen is entirely blank The startup sound plays (Ubuntu is configured to auto-login) Still, the LCD screen is entirely blank. When I press Fn-F8 (the switch between LCD screen and external VGA), the LCD screen shows my desktop correctly and everything seems to work fine. Except for the adjust contrast buttons (Fn-F5 and Fn-F6), these seem to cycle through random brightness modes. Something like: 0% - 50% - 20% - 0% - 20% - 0% Any ideas what's causing this or how to solve this? coen@elpicu:~$ lspci -v 00:02.0 VGA compatible controller: Intel Corporation N10 Family Integrated Graphics Controller (prog-if 00 [VGA controller]) Subsystem: ASUSTeK Computer Inc. Device 83ac Flags: bus master, fast devsel, latency 0, IRQ 44 Memory at f7e00000 (32-bit, non-prefetchable) [size=512K] I/O ports at dc00 [size=8] Memory at d0000000 (32-bit, prefetchable) [size=256M] Memory at f7d00000 (32-bit, non-prefetchable) [size=1M] Expansion ROM at <unassigned> [disabled] Capabilities: <access denied> Kernel driver in use: i915 Kernel modules: i915 00:02.1 Display controller: Intel Corporation N10 Family Integrated Graphics Controller Subsystem: ASUSTeK Computer Inc. Device 83ac Flags: bus master, fast devsel, latency 0 Memory at f7e80000 (32-bit, non-prefetchable) [size=512K] Capabilities: <access denied>

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