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• Did You Know: I'm going back to Boston!

  - by Kalen Delaney

  After spending 5 months in Boston last summer and fall, I'm going back again, to teach my 5-day SQL Server Internals and Query Tuning class for Boston SQL Training. Last time I taught my course there, we had a completely full class with a waiting list. So I'm going to offer the course again! The class will be delivered April 11- 15 but early bird registration ends next Tuesday, February 1st. I'm very excited to go back, and thankful to Adam Machanic of Boston SQL Training for this opportunity. You...(read more)

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• Unable to remove some unity lenses

  - by S Prasanth

  I removed the files, video, photos and friends lenses with the following command. sudo apt-get purge unity-lens-files unity-lens-video unity-lens-photos unity-lens-friends Although the corresponding results have disappeared from dash, only the friends tab has been removed. There still are tabs for files, video and photos, albeit empty. How do I remove these empty tabs? I use Ubuntu 13.10 Saucy Salamander. I understand that this issue didn't exist in 12.04. The directory structure of unity lenses seems to have changed from 12.04 to 13.10. Earlier the lenses were stored in /usr/share/unity/lenses/. That isn't the case now, rendering this answer inappropriate: http://askubuntu.com/a/120116/111720

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• Transactional Interceptors in Java EE 7 - Request for feedback

  - by arungupta

  Linda described how EJB's container-managed transactions can be applied to the Java EE 7 platform as a whole using a solution based on CDI interceptors. This can then be used by other Java EE components as well, such as Managed Beans. The plan is to add an annotation and standardized values in the javax.transaction package. For example: @Inherited @InterceptorBinding @Target({TYPE, METHOD}) @Retention(RUNTIME) public @interface Transactional { TxType value() default TxType.REQUIRED } And then this can be specified on a class or a method of a class as: public class ShoppingCart { ... @Transactional public void checkOut() {...} ... } This interceptor will be defined as part of the update to Java Transactions API spec at jta-spec.java.net. The Java EE 7 Expert Group needs your help and looking for feedback on the exact semantics. The complete discussion can be read here. Please post your feedback to [email protected] and we'll also consider comments posted to this entry.

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• I need help installing Ubuntu 11.10 to multi-drive system

  - by CookyMonzta

  I have a machine with 3 hard drives; the primary, which is 750GB (drive 0), and 2 others, each of which is 640GB (drives 1 and 2). On the last screen before the actual installation begins, this is how my hard drive configuration looks: /dev/sda [DISK0, 750GB] /dev/sda1 ntfs 104MB [Win7 System Reserved] /dev/sda2 ntfs 499,997MB [Windows 7 Pro] free space 250,052MB [This space intended for Windows 8] /dev/sdb [DISK1, 640GB] /dev/sdb1 ntfs 400,085MB [Windows XP Pro] free space 240,049MB [This space intended for Ubuntu] /dev/sdc [DISK2, 640GB] [This drive intended for various backups] free space 160,033MB /dev/sdc5 ntfs 480,101MB [Acronis Secure Zone] As you can see, I have 3 drives, all SATA. I have Win7 on my first drive (0), WinXP on my second drive (1) and a secure zone for daily backups on my third drive (2). I want to put Ubuntu 11.10 Oneiric Ocelot on the drive that also has XP. I've already used 400GB for XP and I have 240GB remaining, for which, my intention was to create a 4GB swap file and use the rest for Ubuntu itself. This is what my second hard drive looked like, for my intended setup before installation: /dev/sdb /dev/sdb5 swap 4,095MB [Linux swap] /dev/sdb6 ext4 235,951MB [Ubuntu 11.10] Needless to say, this is only the second time I have attempted to install Linux. I managed to get 7.10 Gutsy Gibbon working on an old machine. I have two problems with this installation: Ubuntu asks for a location to install the boot loader (i.e., "Device for Boot Loader Installation"). I already have a boot loader; namely, Acronis OS Selector (from Acronis Disk Director 11). So I decided to put the Ubuntu boot loader in /dev/sdb6 (where I intend to install Ubuntu), to keep it from interfering with my Acronis OS Selector. Once I hit "Install now", I ended up with the following error: "No root file system is defined. Please correct this from the partitioning menu." What am I missing? Did I attempt to put the boot loader in the wrong place? I assume I did, because as I am writing this entry, I am looking at LinuxIdentity.com's Ubuntu 11.04 Natty Narwhal magazine, and I see a screenshot (Figure 7 on Page 13) that implies that the boot loader can be installed anywhere, including the first hard drive (in the MBR, which would obviously force me to reinstall the Acronis OS Selector) or even on a floppy. But why do I get an undefined root file system error? I thought /dev/sdb6 was the root file. Obviously I'm missing something in the installation procedure. Should I try installing it in Windows using the WUBI Installer? I assume that, if I attempt to install Ubuntu from WinXP (on the second drive), it will automatically install Ubuntu on the empty partition alongside XP. But will I have the option of creating a swap partition? And what if the WUBI Installer searches all of my drives and decides to install Ubuntu on my first drive's empty partition (which I have left empty for Win8 upon its release)?

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• Area of testing

  - by ?????? ??????????

  I'm trying to understand which part of my code I should to test. I have some code. Below is example of this code, just to understand the idea. Depends of some parametrs I put one or another currency to "Event" and return his serialization in the controller. Which part of code I should to test? Just the final serialization, or only "Event" or every method: getJson, getRows, fillCurrency, setCurrency? class Controller { public function getJson() { $rows = $eventManager->getRows(); return new JsonResponse($rows); } } class EventManager { public function getRows() { //some code here if ($parameter == true) { $this->fillCurrency($event, $currency); } } public function fillCurrency($event, $currency) { //some code here if ($parameters == true) { $event->setCurrency($currency); } } } class Event { public function setCurrency($currency) { $this->updatedAt = new Datetime(); $this->currency = $currency; } }

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• Designing exceptions for conversion failures

  - by Mr.C64

  Suppose there are some methods to convert from "X" to "Y" and vice versa; the conversion may fail in some cases, and exceptions are used to signal conversion errors in those cases. Which would be the best option for defining exception classes in this context? A single XYConversionException class, with an attribute (e.g. an enum) specifying the direction of the conversion (e.g. ConversionFromXToY, ConversionFromYToX). A XYConversionException class, with two derived classes ConversionFromXToYException and ConversionFromYToXException. ConversionFromXToYException and ConversionFromYToXException classes without a common base class.

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• How to camel-case where consecutive words have numbers?

  - by Rob I

  Just wondering if anybody has a good convention to follow in this corner-corner-corner case. I really use Java but figured the C# folks might have some good insight too. Say I am trying to name a class where two consecutive words in the class name are numeric (note that the same question could asked about identifier names). Can't get a great example, but think of something like "IEEE 802 16 bit value". Combining consecutive acronyms is doable if you accept classnames such as HttpUrlConnection. But it seriously makes me throw up a little to think of naming the class IEEE80216BitValue. If I had to pick, I'd say that's even worse than IEEE802_16BitValue which looks like a bad mistake. For small numbers, I'd consider IEEE802SixteenBitValue but that doesn't scale that well. Anyone out there have a convention? Seems like Microsoft's naming guidelines are the only ones that describe acronym naming in enough detail to get the job done, but nobody has addressed numbers in classnames.

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• How should I write new code when the old codebase and the environment uses lots of globals in PHP

  - by Nicola Peluchetti

  I'm working in the Wordpress environment which itself heavily relies on globals and the codebase I'm maintaining introduces some more. I want this to change and so I'm trying to think how should I handle this. For the globals our code has introduced I think I will set them as dependencies in the constructor or in getter / setter so that I don't rely on them being globals and then refactor the old codebase little by little so that we have no globals. With Wordpress globals I was thinking to wrap all WP globals inside a Wrapper class and hide them in there. Like this class WpGlobals { public static function getDb() { global $wpdb; return $wpdb; } } Would this be of any help? The idea is that I centralize all globals in one class and do not scatter them through the code, so that if Wordpress kills one of them I need to modify code only in one place. What would you do?

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• New windows from the dock in Gnome Shell

  - by Andrea

  I am using Gnome Shell on Ubuntu 11.10, and I frequently use workspaces, as the shell encourages to do. My only complaint is that it is slow to place different windows of the same program in different workspaces. What I would like to do: click on an empty workspace, click on the Nautilus icon in the dock and browse to the correct folder. Then click on another empty workspace, click on the Nautilus icon and so on. This does not work: the second time I open Nautilus, the dock lets me switch to the previous instance, which is almost never what I want. So I have to click on the Nautilus icon, open a new window, place it on a different desktop, switch to that folder and finally browse to the correct folder. Is there a way to simplify this flow? It would be even better if I was able to link a specific folder from the dock, or better yet to have something similar to a Unity lens, where I can choose between the most used folders.

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• GestureListener's fling method doesn't get called

  - by nosferat

  I'm using SimpleGestureDetector from the libgdx-users Wiki as my InputProcessor. I set it in the created() method: Gdx.input.setInputProcess(new SimpleDirectionGestureDetector(charController)); charController is my class which implements the DirectionListener interface defined in the SimpleDirectionGestureDetector class and it is responsible for moving the player character. However the character doesn't change direction when I'm performing a fling action in any direction. I've checked and the fling() method in the SimpleDirectionGesture class doesn't get called and I have no idea why, since everything seems good. What am I doing wrong?

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• Should concrete classes avoid calling other concrete classes, except for data objects?

  - by Kazark

  In Appendix A to The Art of Unit Testing, Roy Osherove, speaking about ways to write testable code from the start, says, An abstract class shouldn't call concrete classes, and concerete classes shouldn't call concrete classes either, unless they're data objects (objects holding data, with no behavior). (259) The first half of the sentence is simply Dependency Inversion from SOLID. The second half seems rather extreme to me. That means that every time I'm going to write a class that isn't a simple data structure, which is most classes, I should write an interface or abstract class first, right? Is it really worthwhile to go that far in defining abstract classes an interfaces? Can anyone explain why in more detail, or refute it in spite of its benefit for testability?

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• Do employers hiring for software jobs care about the classes you took in a Computer Science Masters program?

  - by Bob Dole

  I'm torn between two classes right now for next semester (Software Design and Advanced Computer Graphics). I would enjoy Advanced Computer Graphics more, but I feel the software design class would help me when approaching anything I ever build for the rest of my career. I feel though I could just buy the book (I already have both books actually) of the Software Design class and go through it, if I wanted. But think it would be a bit tougher to pick up the Advanced Computer Graphics class on my own. So do employers look at the graduate classes you've taken to decide if you would be a good fit or not? I think, more importantly, what I'm wanting to know is if I wanted to work for a high-end software company like Apple or Google would a company like that be more impressed by someone that took software engineering classes or hardcore CS classes?

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• How to design console application with good seperation of UI from Logic

  - by JavaSa

  Is it considered an overkill for console application to be design like MVC , MVP or N tier architecture? If not which is more common and if you can link me to simple example of it. I want to implement a tic tac toe game in console application. I have a solution which hold two projects: TicTacToeBusinessLogic (Class library project) and TicTacToeConsoleApplication (Console application project) to represent the view logic. In the TicTacToeConsoleApplication I've Program.cs class which holds the main entry point (public static void Main). Now I face a problem. I want the game to handle its own game flow so I can: Create new GameManager class (from BL) but this causing the view to directly know the BL part. So I'm a little confused how to write it in an acceptable way. Should I use delegates? Please show me a simple example.

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• Why setter method when getter method enough in PHP OOP

  - by phphunger

  I am practicing OOP with PHP, and I am struck at setter and getter methods. I can directly access the class properties and methods with getter method then what's the use of setter method? See my example. <?php class MyClass{ public $classVar = "Its a class variable"; public function Getter(){ return $this -> classVar; } } $obj = new MyClass; echo $obj -> Getter(); ?>

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• Collision Systems Implementation

  - by hrr4

  Just curious what might be a good way to implement a decent collision system. As a class inherited by a base Entity class? Currently I'm stuck and could just use a couple better ideas than my own. Any help is appreciated! Edit: Sorry, it's 2D Collisioning but honestly, I'm not looking for specific collision methods. I'm looking more about the lines of implementation. Just curious of some of the common methods of how to implement collision systems such as: Should the entire collision system be it's own class? What, if anything, should be inheritable? These are some of my questions. Sorry for the confusion.

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• is 'protected' ever reasonable outside of virtual methods and destructors?

  - by notallama

  so, suppose you have some fields and methods marked protected (non-virtual). presumably, you did this because you didn't mark them public because you don't want some nincompoop to accidentally call them in the wrong order or pass in invalid parameters, or you don't want people to rely on behaviour that you're going to change later. so, why is it okay for that nincompoop to use those fields and methods from a subclass? as far as i can tell, they can still screw up in the same ways, and the same compatibility issues still exist if you change the implementation. the cases for protected i can think of are: non-virtual destructors, so you can't break things by deleting the base class. virtual methods, so you can override 'private' methods called by the base class. constructors in c++. in java/c# marking the class as abstract will do basically the same. any other use cases?

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• Depending on another open source library: copy/paste code or include

  - by user5794

  I'm working on a large class and started implementing new features that need graphics. I started writing the graphics functions myself, but I know that open source libraries exist that can provide me with this functionality without me having to write it myself. The problem is that I prefer the class to be self-sufficient and not dependent on any other library. If I don't write it myself, I would have to ask the user to make sure a graphics library is already installed (less user-friendly). If I write it myself, I do a lot more work than I have to. I could also copy/paste some of the relevant code into my own class, but not sure about the disadvantages of doing this (it's an open source library that matches my license, so I'm not concerned with legality, just programming-wise if there are disadvantages). So what should I do: copy paste code from the external library write the code myself so it's truly self-sufficient ask the user to download and install another library

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• Does this factory method pattern example violate open-close?

  - by William

  In Head-First Design Patterns, they use a pizza shop example to demonstrate the factory method pattern. public abstract class PizzaStore { public Pizza orderPizza(String type) { Pizza pizza; pizza = createPizza(type); pizza.prepare(); pizza.bake(); pizza.cut(); pizza.box(); return pizza; } abstract Pizza createPizza(String type) } public class NYPizzaStore extends PizzaStore { Pizza createPizza(String item) { if (item.equals("cheese") { return new NYStyleCheesePizza(); } else if (item.equals("veggie")) { return new NYStyleVeggiePizza(); } else if (item.equals("clam")) { return new NYStyleClamPizza(); } else if (item.equals("pepperoni")) { return new NYStylePepperioniPizza(); } else return null; } } I don't understand how this pattern is not violating open-close. What if we require a beef Pizza, then we must edit the if statement in the NYPizzaStore class.

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• Can data classes contain methods for validation?

  - by Arturas M

  OK, say I have a data class for a user: public class User { private String firstName; private String lastName; private long personCode; private Date birthDate; private Gender gender; private String email; private String password; Now let's say I want to validate email, whether names are not empty, whether birth date is in normal range, etc. Can I put that validation method in this class together with data? Or should it be in UserManager which in my case handles the lists of these users?

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• battery icon / power indicator not shown in menu bar after upgrade to 12.04

  - by user488728

  since the upgrade from 11.10 to 12.04 the battery icon / power indicator is not shown any more in the menu bar. I went to 'system settings'--'power' and tried to set 'show battery status in menu bar' to 'always', however the selection button seems to be corrupt. Strangely, when I open the power settings dialog, the 'show battery status in menu bar' field is set to an empty string instead of showing one of the three possible choices. When I click on the small arrow next to it, the three possible choices are shown. Whatever I select, upon closing the settings dialog and reopening it, the selection field is back to empty. Please help. Thanks! HF

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• Ubuntu 12.10 and Gnome-Shell : can't see nor launch apps except with Alt + F2

  - by Ratoune2008

  I've installed Ubuntu 12.10 and Gnome-Shell 3.6. Everything worked fine till the moment I've began to customize the main menu (apps wich appears in Dash and so on). I don't know wether I've done something wrong or if there is a bug : suddenly, the Dash became empty. My favourite docks too, except the "Show apps" button. When I activate it, there is only an empty dash, no apps showed. The only way I can access an app is using the "Alt+F2" shortcut. I've tried to restart gnome-shell (Alt-F2 / r) but nothing has changed... A logout and a reboot have not changed ... Do you know how to repair the gnome-shell ? Thanks for your help...

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• Javascript Tips and Tricks

  - by ybbest

  1. Replace all , in one Javascript string. var totalAmount= "100,000,000,000"; var find= ","; //Replace the first , with the empty string var replace=""; totalAmount= totalAmount.replace(find,replace); alert(totalAmount); var totalAmount2= "100,000,000,000"; var newFind=/,/g //Replace all , with empty string totalAmount2= totalAmount2.replace(newFind,replace); alert(totalAmount2);

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• C# Image Download

  - by Nouman Zakir

  A C# class that makes it easier to download images from the web. Use the following code in your program to download image files such as JPG, GIF, PNG, etc from the internet using WebClient class. using System;using System.Drawing;using System.Drawing.Imaging;using System.IO;using System.Net;public class DownloadImage { private string imageUrl; private Bitmap bitmap; public DownloadImage(string imageUrl) { this.imageUrl = imageUrl; } public void Download() { try { WebClient client = new WebClient(); Stream stream = client.OpenRead(imageUrl); bitmap = new Bitmap(stream); stream.Flush(); stream.Close(); } catch (Exception e) { Console.WriteLine(e.Message); } } public Bitmap GetImage() { return bitmap; } public void SaveImage(string filename, ImageFormat format) { if (bitmap != null) { bitmap.Save(filename, format); } }}

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• How to disable password prompt for default keyring?

  - by user110431

  I'm using Ubuntu 12.10 64Bit. How to disable ubuntu enter password for keyring default to unlock prompt ? Every time I open Chrome or ubuntu software center, this annoying window jump out. I have being searching online for a long time, most of the answers are like delete ~/.gnome2/keyring XX , but I don't have such directory or go to password and keys , disable some option, but this window is empty in my case, very strange , even I add a new password keyring, it is still empty. None of these methods works in my case. I will be very appreciate if you can help

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• The rule of 5 - to use it or not?

  - by VJovic

  The rule of 3 (the rule of 5 in the new c++ standard) states : If you need to explicitly declare either the destructor, copy constructor or copy assignment operator yourself, you probably need to explicitly declare all three of them. But, on the other hand, the Martin's "Clean Code" advises to remove all empty constructors and destructors (page 293, G12:Clutter) : Of what use is a default constructor with no implementation? All it serves to do is clutter up the code with meaningless artifacts. So, how to handle these two opposite opinions? Should empty constructors/destructors really be implemented?

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