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• Checking preconditions or not

  - by Robert Dailey

  I've been wanting to find a solid answer to the question of whether or not to have runtime checks to validate input for the purposes of ensuring a client has stuck to their end of the agreement in design by contract. For example, consider a simple class constructor: class Foo { public: Foo( BarHandle bar ) { FooHandle handle = GetFooHandle( bar ); if( handle == NULL ) { throw std::exception( "invalid FooHandle" ); } } }; I would argue in this case that a user should not attempt to construct a Foo without a valid BarHandle. It doesn't seem right to verify that bar is valid inside of Foo's constructor. If I simply document that Foo's constructor requires a valid BarHandle, isn't that enough? Is this a proper way to enforce my precondition in design by contract? So far, everything I've read has mixed opinions on this. It seems like 50% of people would say to verify that bar is valid, the other 50% would say that I shouldn't do it, for example consider a case where the user verifies their BarHandle is correct, but a second (and unnecessary) check is also being done inside of Foo's constructor.

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• Need advice for approach for a web-based app that loads excel worksheet but exposes only the charts

  - by John

  I'm looking for suggestions on the Visual Studio approach to take for a web application that is in the conceptual stage. My environment has a lot of tools: Windows Server 2008 R2 Standard 64bit Visual Studio 2010 Professional Edition Sharepoint 2010 Server Enterprise Edition SQL Server 2008 R2 Office 2010 Professional I know I will need this app to retrieve data from a database (or a web service - not sure exactly at this point). The data needs to be placed in an Excel workbook dynamically. The app will need to have a nice user interface (standard web controls - perhaps with some Javascript effects). The Excel ribbon and worksheet grid will need to be hidden. Some web control(s) will cause the Excel chart(s) to be rendered. I am thinking this sounds like Visual Studio Tools for Office (VSTO) so as to leverage .Net and hide Excel. Can you offer suggestions regarding: One ASP.Net Web App Project One Class Library Project for Excel or perhaps which one of the several different Excel 2010 project types (addin, template, document) Would Excel Services for Sharepoint be useful (or required) ? I am feeling a little overwhelmed with so many choices at this early stage of conceptualizing the app. Can you suggest some ideas for this sort of thing? Also, I am a bit more experienced with C# but I've read VB.Net is better for work with the Excel object model. What are general advises with regard to tool choice and overall approach tradeoffs?

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• How a graphic designer can get into game programming?

  - by Robert Valdez

  I'm a graphic design student hoping to pursue a career as a video game artist. However, I want to do some game development as a hobby. I'd like to develop games for the desktop or mobile phones. The only programming experience I have is that I took an intro to programming with java class in which I learned how to make web applets using java's swing library. It was awful. I think the only things I took from the class was what OOP is and how to work with variables and data types and some methods. I also learned some actionscript myself which was fun unfortunately my flash tutorial expired and it's too expensive to buy;( What I was looking to do is learn one programming language and build a game with it without having to go through so many hoops and with minimum cost. If it's possible. I would love to learn C++, but I read it's not best for a beginning programmer. What programming languages or maybe software kits/platforms would you recommend?

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• How to treat your genius team-mate [closed]

  - by Shiplu

  I am soon going to be in a team where a very talented programmer works. Everyone int the company likes him as he knows a lot of thing and does a lot of programming. The PM and the CEO likes him a lot. I am his fan as a programmer. But as a team mate? I always try to avoid him. The reason is, in the very early days of our company our CEO used to choose both of us in a same team we worked together. Then I had many terrible experiences. Most of the time he is doing others work. When team leader breaks the work load and distributes it, He used to work more than a workday everyday and also doing my own work. The result was same duplicate code. He is not working my working finishing his own, he is doing it in the middle. how do you treat such team-mates.

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• BDD: Getting started

  - by thom

  I'm starting with BDD and this is my story: Feature: Months and days to days In order to see months and days as days As a date conversion fan I need a webpage where users can enter days and months and convert them to days. I have some doubts ... Should I write my scenarios before coding anything or should I first write a scenario and then write code, write a scenario again and then write code, and so on ... ? If I should write my scenarios before, can my steps be approved and production code still does not get done? When should I do refactoring on my code? After the feature is done or after each scenario implementation?

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• Project management without experience

  - by Raven13

  I'm a web developer who is part of a three-man team that has been tasked with a rather large and complex development project. Other than some direction and impetus from management, we're pretty much on our own to develop the new website. None of us have any project management experience nor do my two coworkers seem like they would be interested in taking on that role, so I feel like it's up to me to implement some kind of structure to the development process in order to avoid issues down the road. My question is: what can I do as a developer without project managment experience to ensure that our project gets developed successfully and avoid the pitfalls of developing a project without a plan?

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• SQL Strings vs. Conditional SQL Statements

  - by Yatrix

  Is there an advantage to piecemealing sql strings together vs conditional sql statements in SQL Server itself? I have only about 10 months of SQL experience, so I could be speaking out of pure ignorance here. Where I work, I see people building entire queries in strings and concatenating strings together depending on conditions. For example: Set @sql = 'Select column1, column2 from Table 1 ' If SomeCondtion @sql = @sql + 'where column3 = ' + @param1 else @sql = @sql + 'where column4 = ' + @param2 That's a real simple example, but what I'm seeing here is multiple joins and huge queries built from strings and then executed. Some of them even write out what's basically a function to execute, including Declare statements, variables, etc. Is there an advantage to doing it this way when you could do it with just conditions in the sql itself? To me, it seems a lot harder to debug, change and even write vs adding cases, if-elses or additional where parameters to branch the query.

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• Paranoid management, contractor checking work [closed]

  - by user833345

  Just wanted to get some opinions and experiences on an issue I'm having at work. First, a little background. I've been working at a company for some time (past any probation periods) and rewriting a horrendous system. No tests, incomplete and broken functionality everywhere, enough copypasta to feed a small village, redundant code, more unused SQL tables than used ones and terrible performance. I've never seen such bad code, pretty much all of it is worthy of being posted on TheDailyWTF. The company has been operating for a number of years and have had a string of bad developers working on this system. I made a call on rewriting instead of refactoring since I judged it to be less work overall and decided that the result will address the requirements more appropriately, since the central requirement is to have a future-proof system for the next decade with plenty of room to scale up. Refactoring would have entailed untangling a huge ball of yarn and at the same time integrating it with a proper foundation or building a foundation from scratch. I've introduced the latest spiffy framework, unit & functional testing, CI, a bug tracker and agile workflow to the environment. I've fixed most of the performance issues of the old system (there were no indexes on any of the tables, for example). I've created an automated deployment process for the old system. The CTO has been maintaining the old system while I have been building the new one and he has been advising management that everything is being done as per best practices. However, management is hiring a contractor to come in and verify my work. In my experience, this is unprecedented. I can understand their reasoning to an extent, since they've had bad luck in the past, but can't help but feel somewhat offended at the fact that they distrust two senior developers who have been working with them for some time enough that a third party is being brought in. And it's not just me who is under watch - people's emails are constantly checked, someone had a remote desktop application installed on their computer of which I was asked to check the usage logs to try to determine if they were stealing sensitive data and there are CCTV cameras in one of the rooms. It's the first time I've decided to disable my Skype history at work. Am I right to feel indignant here? Has anyone else ever encountered such a situation? If so, how did it work out in the end? Was it worth sticking around? Should I just find another job?

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• Forking project on Github etiquette

  - by Mike Wills

  There is a project on Github that I mostly like and want to use. There are a few things I want to do differently/remove that doesn't make sense for what I want/need. Also I want to add a few things as well. As I understand it, I should fork the project and I can make whatever changes I want and push back to my fork. From there, I also want to occasionally pull into my fork the changes from the original project so I get the latest bug fixes/features. Am I off-base of how I think it should work? How would bring in the changes from the original project?

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• Who should be the architect in an agile project?

  - by woni

  We are developing the agile way for a few months now and I have some troubles understanding the agile manifesto as interpreted by my colleagues. The project we are developing is a framework for future projects and will be reused many times in the next years. Code is only written to fulfill the needs of the current user story. The product owner tells us what to do, but not how to do it. What would be right, in my opinion, because he is not implicitly a programmer. The project advanced and in my eyes it messed up a little bit. After I recognized an assembly that was responsible for 3 concerns (IoC-Container, communication layer and project internal things), I tried to address this to my colleagues. They answered that this would be the result of applying YAGNI, because know one told them to respect that functionalities have to be split up in different assemblies for further use. In my opinion no one has to tell us that we should respect the Separation of Concerns principle. On the other side, they mentioned to prefer YAGNI over SoC because it is less effort to implement and therefore faster and cheaper. We had changing requirements a lot at the beginning of the project and ended up in endless refactoring sessions, because to much has to be adapted. Is it better to make such rather simple design decisions up front, even there is no need in the current situation, or do we have to change a lot in the later progress of the project?

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• Philosophy behind the memento pattern

  - by TheSilverBullet

  I have been reading up on memento pattern from various sources of the internet. Differing information from different sources has left me in confusion regarding why this pattern is actually needed. The dofactory implementation says that the primary intention of this pattern is to restore the state of the system. Wiki says that the primary intention is to be able to restore the changes on the system. This gives a different impact - saying that it is possible for a system to have memento implementation with no need to restore. And that ability of restore is a feature of this. OODesign says that It is sometimes necessary to capture the internal state of an object at some point and have the ability to restore the object to that state later in time. Such a case is useful in case of error or failure. So, my question is why exactly do we use this one? Is it to save previous states - or to promote encapsulation between the Caretaker and the Memento? Why is this type of encapsulation so important? Edit: For those visiting, check out this Implementation!

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• How to make custom libraries accessible?

  - by Milen Bilyanov

  I am trying to compile and install every custom module under it's own designated folder. (ex: /myApps/myLinux/compiled_app) I had luck with python so far, where my python is compiled from source and lives in: /myApps/myLinux/python2.5 and "python2.5" - /myApps/myLinux/python2.5.6-gcc463 so I can access this python through a wrapper script that sets the right environment. The question is recently I had to compile and add something called gperf3.0.4. So now it lives: /myApps/myLinux/gperf3.0 and "gperf3.0" - /myApps/myLinux/gperf3.0.4-gcc463 The question is: How will I point to this lib if some other app needs to access it? Is it done through the LD_LIBRARY_PATH variable? Thanks.

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• How to update dependency during runtime in my .NET application?

  - by Louis Rhys

  I have a server-client application. Sometimes the server is updated which requires some DLLs in the client to be updated as well (The DLLs are the dependencies of the main executable). For now, we have to close the client, manually deploy the DLLs, and then start the client again. This is kind of an inconvenience because the client is an automated application, so normally it doesn't need any user intervention. Is it possible for this to be done automatically without restart or user intervention? Like, the client would download the latest DLL, and replace the current one?

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• Can Win32 message loops survive being ported to native linux?

  - by Chris Cochran

  I would like to port a large Win32 DLL to native linux in C++. I don't think I can use Wine for a DLL like mine, because users of the DLL would then also have to be in Wine, and then they would all whine... As a Windows C++ programmer, I don't (yet) have any familiarity with the GUI front-end services in linux, but if it logically runs on anything like win32 message loops, fonts, bitmaps, invalidation regions, getmessage( ) calls and so forth, it should be a fairly straight forward remapping of my existing code. So what am I looking at here, a remap or a rewrite? The path for such things must be well worn by now.

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• Is QTWebKit still being actively developed? [closed]

  - by Brian M. Hunt

  I am considering recommending PhantomJS/CasperJS for a project, to provide continuous integration testing. Unfortunately those testing frameworks are based on QTWebKit, and it does not appear that there has been much activity on QTWebKit since September of 2011. It seems this is because of Nokia's financial troubles. QT has since been sold to Digia in August of this year, and can be found on qt.digia.com. It is not apparent whether QTWebKit will be actively developed. Before putting the effort into developing a PhantomJS/CasperJS testing framework, I would like to know whether the underlying QTWebKit framework is probably going to continue to be actively developed (or, alternatively, could be easily substituted with an alternative). I would suspect that since Digia just acquired QT it is a little too soon to tell what direction they will take the project. I would be interested in thoughts and comments on this issue.

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• creating object parameters in {}?

  - by RealityDysfunction

  I am trying to decode a piece of code from a book: List<Person> people = new List<Person>() { new Person {FirstName="Homer",LastName="Simpson",Age=47}, new Person {FirstName="Marge",LastName="Simpson",Age=45} }; Person is just a simple class they made, with a bunch of fields: Name, Last Name, etc... What I don't understand is, don't we send parameters to a constructor of Person in non-curly brackets? I tried replicating this code, but it doesn't seem to fly, any takers? Thanks for input.

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• How can I distribute a unique database already in production?

  - by JVerstry

  Let's assume a successful web Spring application running on a MySQL or PostgreSQL database. The traffic is becoming so high and the amount of data is becoming so big that a distributed database solution needs to be implemented to address scalability issue. Let's also assume this application is using Hibernate and the data access layer is cleanly separated with DAOs. Ideally, one should be able to add or remove databases easily. A failback solution is welcome too. What would be the best strategy to scale this database? Is it possible to minimize sharding code (Shard) in the application?

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• Where to put business logic in MVC design?

  - by BriskLabs Pakistan

  I have created a simple MVC java application that adds records through data forms to a database. my app collects data, it also validates it and stores it. This is because the data is being sourced online from different users. the data is mostly numeric in nature. now on the numeric data being stored into database (SQL server) , i wish that my app should be able to perform computations... and display it. the user is not interested in how computations are done so they must be encapsulated. the user must only be able to view the simple computed data which for example A column data - B Column data / C column data etc... and just display it to the user... i know how to write stored procedures for same but i want a 3 tier app I want the data, that I put into the database as a record, worked upon by performing calculations on it. However, the original data should remain unaffected, while the new data, post-calculations, must be stored as a new entity record into the database. Where should I write the code for this background calculation? As it is the rules and business logic... in a new java beans files ?

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• MVC, when to separate controllers?

  - by Rodolfo

  I'm starting with MVC and have a newbie question. What would be the logic criteria to define what a controller should encompass? For example, say a website has a 'help' section. In there, there are several options like: 'about us', 'return instructions', 'contact us', 'employment opportunities'. Each would then be accessed like 'mysite.com/help/aboutus', 'mysite.com/help/returns', 'mysite.com/help/contactus', etc. My question is, should I have a 'help' controller that has 'about us', 'returns', 'contact us', 'employment' as actions with their respective view, or should each of those be a different controller-action-view set? What should be the line of reasoning to determine when to separate controllers?

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• We are moving an Access based corporate front-end into a Web-based App

  - by Max Vernon

  We have an enterprise application with a front end written in Microsoft Access 2003 that has evolved over the past 6 years. The back end data, and a fair amount of back-end logic is contained within several Microsoft SQL Server databases. This front end app consists of around 180 forms, and over 120,000 lines of code, and interacts with VB.Net DLLs that support various critical functions used by our sales force. The current system makes use of 3 monitors to display various information; the Access app uses COM+ to control Microsoft Outlook and Internet Explorer for various purposes. The Access front end sometimes occupies 2 screens, automatically resizing itself based on Windows API-reported screen dimensions. The app also uses a Google map to present data to our agents, and allows two-way interactivity with the map through COM+ connectivity to JavaScript contained in the Google map. At the urging of senior management, we are looking to completely rewrite this application using some web-based technology, such as ASP.Net or perhaps a LAMP stack (the thinking with the LAMP stack thing is "free" is pretty cheap). We want to move to a web-based app so we can eliminate the dependency on our physical location for hiring new sales force members. Currently, our main office is full to capacity, and we need to continue growing the company. Does anyone have any thoughts on what would be the best technology to use for a web-based app of this magnitude? Keeping in mind the app is dependent on back-end services on our existing infrastructure. The app handles financial data and personal customer data, among other things. [I've looked at Best practices for moving large MS Access application towards .Net? and read the answers, and most of the comments. Interesting reading, and has some valid points, but our C.O.O. and contracted Software Architect are pushing for a full web-based app, not a .Net Windows App]

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• Service Layer - how broad should it be, and should it be used also on the local application?

  - by BornToCode

  Background: I need to build a main application with some operations (CRUD and more) (-in winforms), I need to make another application which will re-use some of the functions of the main application (-in webforms). I understood that using service layer is the best approach here. If I understood correctly the service should be calling the function on the BL layer (correct me if I'm wrong) The dilemma: In my main winform UI - should I call the functions from the BL, or from the service? (please explain why) Should I create a service for every single function on the BL even if I need some of the functions only in one UI? for example - should I create services for all the CRUD operations, even though I need to re-use only update operation in the webform? YOUR HELP IS MUCH APPRECIATED

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• 3d point cloud reconstruction using in c++

  - by techie_db

  I've got a project which involves 3D reconstruction if point clouds from a 3D scanner. Being relatively new to the computer vision field I'm in the dark. The objective of the project is to implement this 3D reconstruction in C/C++ without using Matlab so that it can be further integrated with the ROS (for robots). Can anyone guide me with this issue so that I get enough idea regarding how to approach the problem?

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• Standard -server to server- and -browser to server- authentication method

  - by jeruki

  I have server with some resources; until now all these resources were requested through a browser by a human user, and the authentication was made with an username/password method, that generates a cookie with a token (to have the session open for some time). Right now the system requires that other servers make GET requests to this resource server but they have to authenticate to get them. We have been using a list of authorized IPs but having two authentication methods makes the code more complex. My questions are: Is there any standard method or pattern to authenticate human users and servers using the same code? If there is not, are the methods I'm using now the right ones or is there a better / more standard way to accomplish what I need? Thanks in advance for any suggestion.

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• Implementing set of processes in a stored procedure or through the code?

  - by just_name

  I want to know what's the suitable method to implement the following case (best practice). If i make a set of processes like this : 1- select data from set of DB tables. 2- loop on the selected result . 3- Make some checks on each iteration . 4- Insert the result in another table . Implementing the previous steps in a stored procedure or in a transaction through my code (asp.net) . ? Concerning the performance , security and reliability issues .

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• Canonical representation of a class object containing a list element in XML

  - by dendini

  I see that most implementations of JAX-RS represent a class object containing a list of elements as follows (assume a class House containing a list of People) <houses> <house> <person> <name>Adam</name> </person> <person> <name>Blake</name> </person> </house> <house> </house> </houses> The result above is obtained for instance from Jersey 2 JAX-RS implementation, notice Jersey creates a wrapper class "houses" around each house, however strangely it doesn't create a wrapper class around each person! I don't feel this is a correct mapping of a list, in other words I'd feel more confortable with something like this: <houses> <house> <persons> <person> <name>Adam</name> </person> <person> <name>Blake</name> </person> </persons> </house> <house> </house> </houses> Is there any document explaining how an object should be correctly mapped apart from any opninion?

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