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• How to recognize a good programmer?

  - by gius

  Our company is looking for new programmers. And here comes the problem - there are many developers who look really great at the interview, seem to know the technology you need and have a good job background, but after two moths of work, you find out that they are not able to work in a team, writing some code takes them very long time, and moreover, the result is not as good as it should be. So, do you use any formalized tests (are there any?)? How do you recognize a good programmer - and a good person? Are there any simple 'good' questions that might reveal the future problems? ...or is it just about your 'feeling' about the person (ie., mainly your experience), and trying him out? Edit: According to Manoj's answer, here is the question related to the coding task at the job interview.

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• Inside BackgroundWorker

  - by João Angelo

  The BackgroundWorker is a reusable component that can be used in different contexts, but sometimes with unexpected results. If you are like me, you have mostly used background workers while doing Windows Forms development due to the flexibility they offer for running a background task. They support cancellation and give events that signal progress updates and task completion. When used in Windows Forms, these events (ProgressChanged and RunWorkerCompleted) get executed back on the UI thread where you can freely access your form controls. However, the logic of the progress changed and worker completed events being invoked in the thread that started the background worker is not something you get directly from the BackgroundWorker, but instead from the fact that you are running in the context of Windows Forms. Take the following example that illustrates the use of a worker in three different scenarios: – Console Application or Windows Service; – Windows Forms; – WPF. using System; using System.ComponentModel; using System.Threading; using System.Windows.Forms; using System.Windows.Threading; class Program { static AutoResetEvent Synch = new AutoResetEvent(false); static void Main() { var bw1 = new BackgroundWorker(); var bw2 = new BackgroundWorker(); var bw3 = new BackgroundWorker(); Console.WriteLine("DEFAULT"); var unspecializedThread = new Thread(() => { OutputCaller(1); SynchronizationContext.SetSynchronizationContext( new SynchronizationContext()); bw1.DoWork += (sender, e) => OutputWork(1); bw1.RunWorkerCompleted += (sender, e) => OutputCompleted(1); // Uses default SynchronizationContext bw1.RunWorkerAsync(); }); unspecializedThread.IsBackground = true; unspecializedThread.Start(); Synch.WaitOne(); Console.WriteLine(); Console.WriteLine("WINDOWS FORMS"); var windowsFormsThread = new Thread(() => { OutputCaller(2); SynchronizationContext.SetSynchronizationContext( new WindowsFormsSynchronizationContext()); bw2.DoWork += (sender, e) => OutputWork(2); bw2.RunWorkerCompleted += (sender, e) => OutputCompleted(2); // Uses WindowsFormsSynchronizationContext bw2.RunWorkerAsync(); Application.Run(); }); windowsFormsThread.IsBackground = true; windowsFormsThread.SetApartmentState(ApartmentState.STA); windowsFormsThread.Start(); Synch.WaitOne(); Console.WriteLine(); Console.WriteLine("WPF"); var wpfThread = new Thread(() => { OutputCaller(3); SynchronizationContext.SetSynchronizationContext( new DispatcherSynchronizationContext()); bw3.DoWork += (sender, e) => OutputWork(3); bw3.RunWorkerCompleted += (sender, e) => OutputCompleted(3); // Uses DispatcherSynchronizationContext bw3.RunWorkerAsync(); Dispatcher.Run(); }); wpfThread.IsBackground = true; wpfThread.SetApartmentState(ApartmentState.STA); wpfThread.Start(); Synch.WaitOne(); } static void OutputCaller(int workerId) { Console.WriteLine( "bw{0}.{1} | Thread: {2} | IsThreadPool: {3}", workerId, "RunWorkerAsync".PadRight(18), Thread.CurrentThread.ManagedThreadId, Thread.CurrentThread.IsThreadPoolThread); } static void OutputWork(int workerId) { Console.WriteLine( "bw{0}.{1} | Thread: {2} | IsThreadPool: {3}", workerId, "DoWork".PadRight(18), Thread.CurrentThread.ManagedThreadId, Thread.CurrentThread.IsThreadPoolThread); } static void OutputCompleted(int workerId) { Console.WriteLine( "bw{0}.{1} | Thread: {2} | IsThreadPool: {3}", workerId, "RunWorkerCompleted".PadRight(18), Thread.CurrentThread.ManagedThreadId, Thread.CurrentThread.IsThreadPoolThread); Synch.Set(); } } Output: //DEFAULT //bw1.RunWorkerAsync | Thread: 3 | IsThreadPool: False //bw1.DoWork | Thread: 4 | IsThreadPool: True //bw1.RunWorkerCompleted | Thread: 5 | IsThreadPool: True //WINDOWS FORMS //bw2.RunWorkerAsync | Thread: 6 | IsThreadPool: False //bw2.DoWork | Thread: 5 | IsThreadPool: True //bw2.RunWorkerCompleted | Thread: 6 | IsThreadPool: False //WPF //bw3.RunWorkerAsync | Thread: 7 | IsThreadPool: False //bw3.DoWork | Thread: 5 | IsThreadPool: True //bw3.RunWorkerCompleted | Thread: 7 | IsThreadPool: False As you can see the output between the first and remaining scenarios is somewhat different. While in Windows Forms and WPF the worker completed event runs on the thread that called RunWorkerAsync, in the first scenario the same event runs on any thread available in the thread pool. Another scenario where you can get the first behavior, even when on Windows Forms or WPF, is if you chain the creation of background workers, that is, you create a second worker in the DoWork event handler of an already running worker. Since the DoWork executes in a thread from the pool the second worker will use the default synchronization context and the completed event will not run in the UI thread.

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• What criteria would I use SQL Stream Insight vs TPL Dataflow [closed]

  - by makerofthings7

  There is an add-in to the Task Parallel Library (TPL) called TPL Dataflow that allows a variety of data processing scenarios. It seems that there are some parallels to the SQL Stream Insight product, however since SQL's Stream Insight has some interesting licensing around it, and it has a better performance depending on what license I get... I found myself asking myself should I use TPL Dataflow and not have any licensing issues, and possibly better performance. Can anyone tell me if performance is a valid criteria for comparing SQL Stream Insight vs TPL Dataflow? What other criteria should I be looking at when comparing the two?

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• Licensing a collaborative research project

  - by Marcus Jones

  I am involved with an international research project which involves many different universities, national labs, and companies. The project is developed by national grants and in-kind support. One task in the project is to develop code to streamline workflow in our domain (energy simulation) by scripting common pre- and post-processing tasks for different tools. We want this code to be freely distributable to the simulation community. How can we ensure that this effort is digestible by the legal departments of these different parties such that the people involved can freely code?

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• Prevent shutdown when rsnapshot is running

  - by highsciguy

  Since shutdowns during rsnapshot operation will lead to inconsistent/partial backups, I wonder how to delay the system shutdown while rsnapshot is active. The task is complicated by the fact that I need a solution which is compatible with non-expert users. I.e. I need to tell reliably to the user that he needs to wait until the process is finished and not to do a hard reset. Once this is the case shutdown should continue. A possible solution could be to replace the action of the window managers (mostly KDE) shutdown/restart/hibernate buttons by a script which first checks if rsync is active and shows a message if this is the case. But I do not know if this is possible in KDE.

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• Upgrade to Quantal unity top bar, side bar, and window declorations missing

  - by Nicky Bailuc

  I upgraded from 12.04.1 to 12.10 via the Update Manager and the upgrade said it completed successfuly. However after rebooting the unity task bar was missing along with the launch bar and the window declorations. All compiz settings seemed to be purge deleted, and at first bootup it gave me a system error. The desktop exists, and once I remember I messed up the compiz settings and just had to press Ctrl+Alt+F1 and in the virtual terminal type "unity --reset" then "sudo reboot". Everything worked as if i reinstalled the entire operating system. This time it said “Warning no variable set. setting to :0. The reset option is now dupricated”. What am I suppose to do now? I need this fixed as soon as possible because I need a couple of certainly installed programs and the data within them (long story short).

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• How to modify Dreamweaver's SpryMenuBar.js to send a msgbox on what menu was clicked?

  - by Mike

  I have a simple HTML webpage made in Dreamweaver with a SpryMenuBar. When I click on a menu item, I want to send a pop up message box that says which menu item was clicked. (This is not really my objective but once I can learn to hook into the spry java script with a mouse click listener I can try to do what I am really after.) The problem is for some reason I can't seem to get started with this seemingly simple task. Does anybody know how to revise the SpryMenuBar.js to make a msgbox showing the item that was clicked? For example if I click a menu that say's 'Contact us', I wan't to throw a message box that says "You pressed, Contact us". Note: My final objective is to actually call another function that changes text in the center of my page, depending on what menu item was clicked.

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• Strategy/algorithm to divide fair teams based on history

  - by Vegar

  We are a group of people playing floorball together on a regular basis. Every session starts with the daunting task of dividing teams... So what would be better than an application to pick teams automatically? So, given a history of team-combinations and results, and a list of people showing up for this particular session, what would be a good strategy to find the optimal teams? By optimal, I mean teams as equal as possible. Any ideas? Edit: To make it clear, the date that I have to base the picking on, would be something like this: [{ team1: ["playerA", "playerB", "playerC"], team2: ["playerD", "playerE", "playerF"], goals_team1: 10, goals_team2: 8 }, { team1: ["playerD", "playerB", "playerC"], team2: ["playerA", "playerE", "playerG"], goals_team1: 2, goals_team2: 5 }, { team1: ["playerD", "playerB", "playerF"], team2: ["playerA", "playerE", "playerC"], goals_team1: 4, goals_team2: 2 }]

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• Comparing the Performance of Visual Studio&apos;s Web Reference to a Custom Class

  As developers, we all make assumptions when programming. Perhaps the biggest assumption we make is that those libraries and tools that ship with the .NET Framework are the best way to accomplish a given task. For example, most developers assume that using <a href="http://www.4guysfromrolla.com/articles/120705-1.aspx">ASP.NET's Membership system</a> is the best way to manage user accounts in a website (rather than rolling your own user account store). Similarly, creating a Web Reference to communicate with a <a href="http://www.4guysfromrolla.com/articles/100803-1.aspx">web service</a> generates markup that auto-creates a <i>proxy class</i>, which handles the low-level details of invoking the web service, serializing parameters,

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• Tips/tricks to manage a new team with new code

  - by Fanatic23

  How do you handle yourself in a new team where you are the senior most developer and most others in the team are junior to you by several years. The task ahead of the team is something nobody else including you has accomplished in their career before. Management insists on higher productivity of the whole team, and as senior developer you are responsible. Any tips for coming out trumps in a situation like this? Clearly, the entire team needs time to learn and let's not forget the team's new. However, deadlines are up ahead as well...

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• Is there an antipattern to describe this method of coding?

  - by P.Brian.Mackey

  I have a codebase where the programmer tended to wrap things up in areas that don't make sense. For example, given an Error log we have you can log via ErrorLog.Log(ex, "friendly message"); He added various other means to accomplish the exact same task. E.G. SomeClass.Log(ex, "friendly message"); Which simply turns around and calls the first method. This adds levels of complexity with no added benefit. Is there an anti-pattern to describe this?

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• Ask the Readers: How Do You Set Up a Novice-Proof Computer?

  - by Jason Fitzpatrick

  You’re into technology, you like tweaking and tinkering with computers, and, most importantly, you know how to keep your computer from turning into a virus-laden and fiery wreck. What about the rest of your family and friends? How do you set up a novice-proof computer to keep them secure, updated, and happy? It’s no small task protecting a computer from an inexperienced user, but for the benefit of both the novice and the innocent computer it’s an important undertaking. This week we want to hear all about your tips, tricks, and techniques for configuring the computers of your friends and relatives to save them from themselves (and keep their computer running smoothly in the process). Sound off in the comments with your tricks and check back in on Friday for the What You Said roundup to add see how your fellow readers get the job done. How Hackers Can Disguise Malicious Programs With Fake File Extensions Can Dust Actually Damage My Computer? What To Do If You Get a Virus on Your Computer

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• How to create a use case diagram for board game played on PC

  - by user970696

  I'm struggling with a task as I was given to practice UML and use cases. The problem is that I should model computer version of a board game so I am unsure about a few things. obviously it does not matter if you play against the PC or another player, the actions are the same. The game is simply like tic tac toe. E.g. Actor Player ---(Place a diamond)-----include----(Check for a row)---include--(Swap players) But the game is played on the PC, so is Check for row really a use case? And the same with Swap players? Because the system would do that. On the other hand, if it was not, how could I continue?

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• Revamped Joomla site to Google search engine

  - by user3127632

  I am about to upload a revamped site of Joomla (update from 1.5 to 2.5 + changes). I currently have a test bed subdomain that I am currently working on. In few days I am about to do the swap and replace the old site with the new one. I am worrying about Search Engines and specifically Google. The site currently has a very good rank (appears 2nd in the search), what actions do I have to take in order to be updated and preserve the rank? (except submitting the new sitemap I guess). It's not a difficult task but because I don't have the option to be wrong or mistakes to be done I an asking for a more "expert" advice.

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• Add Custom Color Changing RGB LED Lighting to Your Next Project

  - by Jason Fitzpatrick

  While this specific project is a really neat back-lit bookcase with customizable LED lights galore, you could easily add the exact same setup to just about anything you wanted to give some LED love. The core of the project is a set of addressable LED modules, an Arduino board, and a simple bit of code. You could use it to make a 70s style mood lighting box, add color changing accents to your media room, or any other number of fun projects just by cloning this project and extending/shortening the wires where appropriate. The control module allows for solid colors, multi-colors, and animations. Hit up the link below for more information including the source code. ExpeditInvaders [via IKEAHacker] HTG Explains: What The Windows Event Viewer Is and How You Can Use It HTG Explains: How Windows Uses The Task Scheduler for System Tasks HTG Explains: Why Do Hard Drives Show the Wrong Capacity in Windows?

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• Laptop works fine with ac adapter, hangs after login screen using battery

  - by tavoton

  I did an Ubuntu 10.10 Desktop Edition clean install (amd64 version) on a notebook Medion Akoya E1311. With AC adapter everything works fine, but using battery, it hangs after login screen. I can type login, password too, and I can press login button. But then I can see mouse cursor and lower task bar, not upper, and nothing works. The only thing I can do is login on a terminal with ctrl+alt+F1, this is ok. Nothing seems alive on Gnome except mouse cursor. The only thing I did after Ubuntu fresh install was donwloading driver for RTL8191SE from Realtek web, because WiFi didn't work, now works fine, with ac adapter of course. Hardware is a Notebook Medion Akoya E1311 AMD Sempron 210U 1 GB DDR2 ATI RS690M (Radeon X1200 Series) Western Digital 160GB wireless RTL8191SEvB ethernet RTL8101E/RTL8102E

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• Handling cameras in a large scale game engine

  - by Hannesh

  What is the correct, or most elegant, way to manage cameras in large game engines? Or should I ask, how does everybody else do it? The methods I can think of are: Binding cameras straight to the engine; if someone needs to render something, they bind their own camera to the graphics engine which is in use until another camera is bound. A camera stack; a small task can push its own camera onto the stack, and pop it off at the end to return to the "main" camera. Attaching a camera to a shader; Every shader has exactly one camera bound to it, and when the shader is used, that camera is set by the engine when the shader is in use. This allows me to implement a bunch of optimizations on the engine side. Are there other ways to do it?

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• Are developers expected to have skills of business analysts?

  - by T. Webster

  Our business analyst has left the team. We are now expected to do the work which was previously done by the business analyst, and the management thinks that a task which is done in three months by a business analyst can be done in one month by a developer. My experience is in programming only, and I'm not familiar to the business intelligence tools. To me this seems like maybe an unfair comparison or expectation, and might even trivialize the role of a business analyst. Has anyone else encountered this situation? How to deal with it?

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• How do I set my environment up for TopCoder?

  - by Nils

  I tried out TopCoder today. While I liked the problem, the Java editor didn't work for me. The remote compiling time and the lack of unit tests also made it difficult to complete the task. I ended up coding the solution in Eclipse and the pasting it into the TopCoder window. I tried out EclipseCoder, but it didn't suit my needs either. What tools do you use and how do you hook up your development environment with TopCoder? How does TopCoder handle submissions, and is there any way to speed up the time it takes to process them?

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• Is MVC now the only way to write PHP?

  - by JasonS

  Hey... its XMAS Eve and something is bugging me... yes, I have work on my mind even when I am on holiday. The vast amount of frameworks available for PHP now use MVC. Even ASP.net has its own MVC module. I can see the attraction of MVC, I really can and I use it frequently. The only downside that I can see is that you have to fire up the whole system to execute a page request. Depending on your task this can be a little wasteful. So the question. In a professional environment is this the only way to use PHP nowadays or are their other design methods which have alternative benefits?

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• Jumpshare Makes It Dead Simple To Drag, Drop, and Share 150+ File Formats

  - by Jason Fitzpatrick

  If you’re looking for a super simple way to share files with friends and coworkers Jumpshare offers drag and drop file transfer with a powerful built in file viewer. You don’t need to register, install any software, or do anything but drag the file, drop it onto the Jumpshare interface, and share the link with your friend. Share the link and your friend can watch the real-time progress of the file upload as well as download or view the completed files within the Jumpshare file viewer. Files are hosted for two weeks before deletion. Hit up the link below to take it for a test drive. Jumpshare HTG Explains: Is ReadyBoost Worth Using? HTG Explains: What The Windows Event Viewer Is and How You Can Use It HTG Explains: How Windows Uses The Task Scheduler for System Tasks

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• SQL SERVER – Merge Two Columns into a Single Column

  - by Pinal Dave

  Here is a question which I have received from user yesterday. Hi Pinal, I want to build queries in SQL server that merge two columns of the table If I have two columns like, Column1 | Column2 1                5 2                6 3                7 4                8 I want to output like, Column1 1 2 3 4 5 6 7 8 It is a good question. Here is how we can do achieve the task. I am making the assumption that both the columns have different data and there is no duplicate. USE TempDB GO CREATE TABLE TestTable (Col1 INT, Col2 INT) GO INSERT INTO TestTable (Col1, Col2) SELECT 1, 5 UNION ALL SELECT 2, 6 UNION ALL SELECT 3, 7 UNION ALL SELECT 4, 8 GO SELECT Col1 FROM TestTable UNION SELECT Col2 FROM TestTable GO DROP TABLE TestTable GO Here is the original table. Here is the result table. Reference: Pinal Dave (http://blog.sqlauthority.com)Filed under: PostADay, SQL, SQL Authority, SQL Query, SQL Server, SQL Tips and Tricks, T SQL

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• Microsoft Access 2010: How to Modify Tables

  As you work with Microsoft Access 2010, it is highly likely that you will run in to times where you need to modify the fields contained within your tables. Luckily, this is a task that is not hard to accomplish, and this tutorial will teach you how to do so. Before you begin modifying tables, you should be aware that there are basically three different ways in which you can affect or control the type of data that enters your fields, which are data types, character limits, and validation rules. We will be taking a look at them today, so let's begin, shall we? Keep in mind that for this tutor...

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• How to correctly create a virtual file system?

  - by Paul

  A task in my homework assignment asks me to create a virtual file system, mount it, and perform some operations on it. I am supposed to create a file of 10 MB whose bits are all set to 0, format it as ext3 and mount it. This is how I've done that: dd if=/dev/zero of=~/filesyst bs=10485760 count=1 sudo mkfs.ext3 ~/filesyst sudo mount –o loop ~/filesyst /media/fuse Even though I've used /dev/sero, the file i still full of gibberish characters (mostly at-signs). The permissions on /media/fuse are drw-rw-rw- (which are alright), but the permissions on the files inside it are something like this: d????????? ? ? ? ? ? lost+found -????????? ? ? ? ? ? secret_bin Where have I gone wrong?

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• ADF Business Components

  - by Arda Eralp

  ADF Business Components and JDeveloper simplify the development, delivery, and customization of business applications for the Java EE platform. With ADF Business Components, developers aren't required to write the application infrastructure code required by the typical Java EE application to: Connect to the database Retrieve data Lock database records Manage transactions   ADF Business Components addresses these tasks through its library of reusable software components and through the supporting design time facilities in JDeveloper. Most importantly, developers save time using ADF Business Components since the JDeveloper design time makes typical development tasks entirely declarative. In particular, JDeveloper supports declarative development with ADF Business Components to: Author and test business logic in components which automatically integrate with databases Reuse business logic through multiple SQL-based views of data, supporting different application tasks Access and update the views from browser, desktop, mobile, and web service clients Customize application functionality in layers without requiring modification of the delivered application The goal of ADF Business Components is to make the business services developer more productive.   ADF Business Components provides a foundation of Java classes that allow your business-tier application components to leverage the functionality provided in the following areas: Simplifying Data Access Design a data model for client displays, including only necessary data Include master-detail hierarchies of any complexity as part of the data model Implement end-user Query-by-Example data filtering without code Automatically coordinate data model changes with business services layer Automatically validate and save any changes to the database   Enforcing Business Domain Validation and Business Logic Declaratively enforce required fields, primary key uniqueness, data precision-scale, and foreign key references Easily capture and enforce both simple and complex business rules, programmatically or declaratively, with multilevel validation support Navigate relationships between business domain objects and enforce constraints related to compound components   Supporting Sophisticated UIs with Multipage Units of Work Automatically reflect changes made by business service application logic in the user interface Retrieve reference information from related tables, and automatically maintain the information when the user changes foreign-key values Simplify multistep web-based business transactions with automatic web-tier state management Handle images, video, sound, and documents without having to use code Synchronize pending data changes across multiple views of data Consistently apply prompts, tooltips, format masks, and error messages in any application Define custom metadata for any business components to support metadata-driven user interface or application functionality Add dynamic attributes at runtime to simplify per-row state management   Implementing High-Performance Service-Oriented Architecture Support highly functional web service interfaces for business integration without writing code Enforce best-practice interface-based programming style Simplify application security with automatic JAAS integration and audit maintenance "Write once, run anywhere": use the same business service as plain Java class, EJB session bean, or web service   Streamlining Application Customization Extend component functionality after delivery without modifying source code Globally substitute delivered components with extended ones without modifying the application   ADF Business Components implements the business service through the following set of cooperating components: Entity object An entity object represents a row in a database table and simplifies modifying its data by handling all data manipulation language (DML) operations for you. These are basically your 1 to 1 representation of a database table. Each table in the database will have 1 and only 1 EO. The EO contains the mapping between columns and attributes. EO's also contain the business logic and validation. These are you core data services. They are responsible for updating, inserting and deleting records. The Attributes tab displays the actual mapping between attributes and columns, the mapping has following fields: Name : contains the name of the attribute we expose in our data model. Type : defines the data type of the attribute in our application. Column : specifies the column to which we want to map the attribute with Column Type : contains the type of the column in the database   View object A view object represents a SQL query. You use the full power of the familiar SQL language to join, filter, sort, and aggregate data into exactly the shape required by the end-user task. The attributes in the View Objects are actually coming from the Entity Object. In the end the VO will generate a query but you basically build a VO by selecting which EO need to participate in the VO and which attributes of those EO you want to use. That's why you have the Entity Usage column so you can see the relation between VO and EO. In the query tab you can clearly see the query that will be generated for the VO. At this stage we don't need it and just use it for information purpose. In later stages we might use it. Application module An application module is the controller of your data layer. It is responsible for keeping hold of the transaction. It exposes the data model to the view layer. You expose the VO's through the Application Module. This is the abstraction of your data layer which you want to show to the outside word.It defines an updatable data model and top-level procedures and functions (called service methods) related to a logical unit of work related to an end-user task. While the base components handle all the common cases through built-in behavior, customization is always possible and the default behavior provided by the base components can be easily overridden or augmented. When you create EO's, a foreign key will be translated into an association in our model. It defines the type of relation and who is the master and child as well as how the visibility of the association looks like. A similar concept exists to identify relations between view objects. These are called view links. These are almost identical as association except that a view link is based upon attributes defined in the view object. It can also be based upon an association. Here's a short summary: Entity Objects: representations of tables Association: Relations between EO's. Representations of foreign keys View Objects: Logical model View Links: Relationships between view objects Application Model: interface to your application  

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