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  • Working with data and meta data that are separated on different servers

    - by afuzzyllama
    While developing a product, I've come across a situation where my group wants to store meta data for data entry forms (questions, layout, etc) in a different database then the database where the collected data is stored. This is mostly for security because we want to be able to have our meta data public facing, while keeping collected data as secure as possible. I was thinking about writing a web service that provides the meta information that the data collection program could access. The only issue I see with this approach is the front end is going to have to match the meta data with the collected data, which would be more efficient as a join on the back end. Currently, this system is slated to run on .NET and MSSQL. I haven't played around with .NET libraries running in SQL, but I'm considering trying to create logic that would pull from the web service, convert the meta data into a table that SQL can join on, and return the combined data and meta data that way. Is this solution the wrong way to approach the problem? Is there a pattern or "industry standard" way of bringing together two datasets that don't live in the same database?

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  • Am I permitted to use an LGPL library without releasing the source to the rest of my application, if I dynamically reference the library?

    - by user185812
    I am a bit confused as to what I am/am not allowed to do with a LGPL Library that I intend on using in a small scale commercial C++ Application that I am developing. My current understanding, although I don't know if I am correct, is that I am permitted use the library without releasing the source to the rest of my application if I dynamically reference the library. Does anyone know if this is correct? Are there any restrictions as to how I reference the library? Thank You! I am not a native English speaker and don't understand the licence entirely.

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  • Which statically typed languages support intersection types for function return values?

    - by stakx
    Initial note: This question got closed after several edits because I lacked the proper terminology to state accurately what I was looking for. Sam Tobin-Hochstadt then posted a comment which made me recognise exactly what that was: programming languages that support intersection types for function return values. Now that the question has been re-opened, I've decided to improve it by rewriting it in a (hopefully) more precise manner. Therefore, some answers and comments below might no longer make sense because they refer to previous edits. (Please see the question's edit history in such cases.) Are there any popular statically & strongly typed programming languages (such as Haskell, generic Java, C#, F#, etc.) that support intersection types for function return values? If so, which, and how? (If I'm honest, I would really love to see someone demonstrate a way how to express intersection types in a mainstream language such as C# or Java.) I'll give a quick example of what intersection types might look like, using some pseudocode similar to C#: interface IX { … } interface IY { … } interface IB { … } class A : IX, IY { … } class B : IX, IY, IB { … } T fn() where T : IX, IY { return … ? new A() : new B(); } That is, the function fn returns an instance of some type T, of which the caller knows only that it implements interfaces IX and IY. (That is, unlike with generics, the caller doesn't get to choose the concrete type of T — the function does. From this I would suppose that T is in fact not a universal type, but an existential type.) P.S.: I'm aware that one could simply define a interface IXY : IX, IY and change the return type of fn to IXY. However, that is not really the same thing, because often you cannot bolt on an additional interface IXY to a previously defined type A which only implements IX and IY separately. Footnote: Some resources about intersection types: Wikipedia article for "Type system" has a subsection about intersection types. Report by Benjamin C. Pierce (1991), "Programming With Intersection Types, Union Types, and Polymorphism" David P. Cunningham (2005), "Intersection types in practice", which contains a case study about the Forsythe language, which is mentioned in the Wikipedia article. A Stack Overflow question, "Union types and intersection types" which got several good answers, among them this one which gives a pseudocode example of intersection types similar to mine above.

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  • Is there a Windows philosophy of programming?

    - by Maglob
    I've been programming both in Unix and Windows environments. Mostly I've worked in Unix, where I've learned Unix Philosophy, which can be summarized as Write programs that do one thing and do it well. Write programs to work together. Write programs to handle text streams, because that is a universal interface. There seems to be a clear difference in programming cultures between Unix and Windows worlds, for example: GUI vs CLI Registry vs config files Lots of tools specializing for any given need vs group of generic orthogonal tools which can combined Is there equivalent of "Unix philosophy" in Windows world? What Unix-programmer can learn from Windows or should be aware of when moving to programming in Windows? I would like answers to focus on the best practices of Windows programming (and not a fight between Windows and Unix).

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  • Is the 'C' in MVC really necessary?

    - by Anne Nonimus
    I understand the role of the model and view in the Model-View-Controller pattern, but I have a hard time understanding why a controller is necessary. Let's assume we're creating a chess program using an MVC approach; the game state should be the model, and the GUI should be the view. What exactly is the controller in this case? Is it just a separate class that has all the functions that will be called when you, say, click on a tile? Why not just perform all the logic on the model in the view itself?

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  • Best Practices in Setting up a Build and Deployment environment for the Java Platform

    - by Genadinik
    I have a project for which "quick and dirty" isn't the best solution. What is the most stable and currently accepted set of procedures/tools that I should look into when setting up my build/deploy dev (and later production) environment? What I mean is: Should I use ANT? Or has there been something better that has evolved? In what instances should I use Maven? What are some best practices to create a continuous integration/deployment environment? What are best practices for doing test-driven development? Anything else?

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  • Thoughts on Development using Virtual Machines

    - by J_A_X
    I'll be working as a development lead for a startup and I've suggested that we use VMs for development. I'm not talking about each developer having a desktop with VMs for testing/development, I mean having a server rack where all VMs are managed and have the developers work from a microPC (ChromeOS anyone?) locally, or even remotely from their home computer. To me, the benefits are the fact that it's extremely scalable, cheaper in the long run, easier to manage and that we utilize the hardware its maximum potential. As for cons, I can't think of any particular showstoppers other than we'll need someone to setup/maintain said setup. I was hoping that some of you might of had a similar setup at your place of employment and be able to weight in with your opinions. Thanks.

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  • Best way to relate code smells to a non technical audience?

    - by Ed Guiness
    I have been asked to present examples of code issues that were found during a code review. My audience is mostly non-technical and I want to try to express the issues in such a way that I convey the importance of "good code" versus "bad code". But as I review my presentation it seems to me I've glossed over the reasons why it is important to write good code. I've mentioned a number of reasons including ease of maintenance, increased likelihood of bugs, but with my "non tech" hat on they seem unconvincing. What is your advice for helping a non-technical audience relate to the importance of good code?

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  • moving from wpf to html5

    - by HighCore
    I don't even know if this is the right StackExchange site to post this question. If it isn't, please excuse me and please let me know which would be the right one. I am an experienced WPF developer, and I seriously love the technology. I feel pretty good when working with XAML, bindings, templates, triggers, MVVM and all the WPF world of goodness. Now I have recieved a job offer which surpasses my current salary by 50%. It a position to work as a C# developer in an ASP.Net MVC4 + HTML5 project. I have never EVER in my whole life worked with ASP.Net, nor HTML and I never ever did a web page or web application before. I certainly find myself worried that I will lose all the comfort and joy I live every day coding in WPF. And in the other hand I understand and have seen in these 3/4 months of job hunting that there's a LOT of ASP.Net and really really little or no WPF in the job market (at least here), so I somehow feel forced towards it. So, my question is: Can anybody who had to go thru this type of change tell me the pros and cons of working with these technologies from a developer's perspective? I don't care about open-source / non-microsoft or non-desktop, I care about REAL development experience in every day working with these techs, and whether ASP.Net MVC 4 + HTML + JS is as crappy as I think it is comparing it to WPF.

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  • How to test the render speed of my solution in a web browser?

    - by Cuartico
    Ok, I need to test the speed of my solution in a web browser, but I have some problems, there are 2 versions of the web solution, the original one that is on server A and the "fixed" version that is on server B. I have VS2010 Ultimate, so I can make a web and load test on solution B, but I can't load the A solution on my IDE. I was trying to use fiddle2 and jmeter, but they only gave me the times of the request and response of the browsers with the server, I also want the time it takes to the browser to render the whole page. Maybe I'm misusing some of this tools... I don't know if this could be usefull but: Solution A is on VB 6.0 Solution B is on VB.Net Thanks in advance!

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  • Why should i write a commit message?

    - by acidzombie24
    Why should i write a commit message? I dont want to and i think its stupid every single time. A gui frontend i use which will go unnamed forces you to do it. I hear other doing it everytime even if they are using the VCS on the command line. If i commit several times a day and havent finish a feature what am i writing about? I ONLY ever write a message after many comments and i feel its time for a mini tag or when i do an actual tag. Am i right or am i missing something? also i am using a distributed system

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  • Should one generally develop a client library for REST services to help prevent API breakages?

    - by BestPractices
    We have a project where UI code will be developed by the same team but in a different language (Python/Django) from the services layer (REST/Java). The code for each layer exits in different code repositories and which can follow different release cycles. I'm trying to come up with a process that will prevent/reduce breaking changes in the services layer from the perspective of the UI layer. I've thought to write integration tests at the UI layer level that we'll run whenever we build the UI or the services layer (we're using Jenkins as our CI tool to build the code which is in two Git repos) and if there are failures then something in the services layer broke and the commit is not accepted. Would it also be a good idea (is it a best practice?) to have the developer of the services layer create and maintain a client library for the REST service that exists in the UI layer that they will update whenever there is a breaking change in their Service API? Conceivably, we would then have the advantage of a statically-typed API that the UI code builds against. If the client library API changes, then the UI code won't compile (so we'll know sooner that there was a breaking change). I'd also still run the integration tests upon building the UI or services layer to further validate that the integration between UI and the service(s) still works.

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  • How to develop "Client script library" for ASP.net controls and how do these work?

    - by Niranjan Kala
    I have been working on .Net platform for 2 years and right now I am working on DevExpress controls for 6 months. All these control have client-side Events which are under some ClientScript nameSpace of particular control, Which specify ClientInstanceName, methods and properties accessible at client side. For example Button1 is ClientInstanceName and Button1.Text is a property, with methods like these: Button1.SetValue(); Button1.GetValue(); In ASP.Net Controls, buttons have the ClientClick event that fires before the Server Side Click event. I have inspected and goggled to extend client side functionality in asp.net controls. For example: create a ClientInstanceName property for controls or CheckedChanged event for CheckBox / RadioButton control. I have tried using these MSDN articles: Injecting Client-Side Script from an ASP.NET Server Control Working with Client-Side Script I got much information and ideas from these articles on how to implement/extend these. All are working in the client side. protected override void AddAttributesToRender(HtmlTextWriter writer) { base.AddAttributesToRender(writer); string script = @"return confirm(""%%POPUP_MESSAGE%%"");"; script = script.Replace("%%POPUP_MESSAGE%%", this.PopupMessage.Replace("\"", "\\\"")); writer.AddAttribute(HtmlTextWriterAttribute.Onclick, script); } Here It is just setting up attribute to the button. but all client side interaction no control from server. Here is that I want to know: How can I implement such functionality to create methods, properties etc. on client side. For example I am creating a PopControl as in the above code snippet same behavior as like Ajax ModalPopupExtender That have OK Button related properties. Ajax Controls can be directed to perform work from server side code e.g. Popup1.show(); How can I do this with such client enabled controls implemented controls as windows do? I am learning creation of Ajax Controls but I do not want to use ScriptManager or depend on another control. Just some extension to standard controls. I am expecting for ideas and implementation methods for such functionality.

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  • I want to sell my software [C# desktop application] but I was Stuck in licencing [closed]

    - by Surendra Soni
    Possible Duplicate: if I use .NET Framework for my application, do I have to pay anything to Microsoft? I have developed a desktop application called "Institute Management System" which has modules like Class manager, Subject manager, Topics manager, Student inquiry manager Student admission manager, Fees manager, Exam manager etc. using C# for the front end and MS Access for the back end. The main problem is that I want to sell it and earn some money but I heard that my application needs to be registered at Microsoft, and I would have to get a license from them for selling, and have to pay them money too. I have spent four months developing it at my own expense, and worked very hard to develop it. So I want some tips, advice, any suggestion for the same. Please also tell me the procedure for all of the required registrations and payment issues. And I also want to ask you if you Can you suggest any other technology where I develop my application and sell it without worrying about licencing and related issues? I am now more confused about that "MS technology is open source or not? "

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  • How you return to a code when you don't remember what you were doing?

    - by speeder
    Well, I have some problems with procrastination and whatnot, but those get infinitely worse, when I cannot remember what I should be doing. I mean, I know my project, I wrote 100% of the code so far, and I knew more or less what I was doing, but I don't remember exactly what, I don't remember what file I was editing and why. How I get back on track? (because right now my technique of opening the source code and staring at it is not working)

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  • Teacher demands excessive/unjustified use of Design Patterns

    - by SoboLAN
    I study computer science and I have a class called "Programming Techniques". Its purpose is to teach (us) good object oriented design principles. During the semester we have homeworks, programs that we must write to demonstrate what we've learned. The lab assistant demands for each of these homeworks that specific design patterns should be used. For example, the current homework is an application used for processing customer orders. We are demanded to use either "Factory Method" or "Abstract Factory" design patterns for this. It gets even worse: at the end of the semester we must write a program (something more complex) that must use at least one creational pattern, at least one structural pattern and at least one behavioural pattern. Is it normal to demand this ? I mean, forcing us to design our programs in such a way that a specific design pattern makes sense is just beyond what I consider ok. If I'm a car mechanic and have a huge tool box, then I will use a certain tool from that box if and when the situation demands it. Not more, not less. If my design of the application doesn't demand at all the use of "Abstract Factory" (for example), then why should I implement it ? I'm not sure yet if the senior lecturer agrees with what the lab assistant is demanding, but I want to talk to him about it and I need solid arguments to do so. How should I approach this problem with him ? PS: I'm sure there must be a better way to teach us these things. Maybe making us each week read about 3 design patterns and the next week giving us a test with small but specific programming or architectural situations/problems. The goal in that test would be to identify what design patterns would make sense and how they could be implemented. This way, he can see if we understand them. EDIT: These homeworks are not just 100-line programs, they have quite a lot of requirements and are fairly complicated. This is the reason we have about 2 - 3 weeks of deadline for each of them. I agree that practicing this is the best way to learn. But shouldn't smaller programs/applications be used for this ? Something just for demonstrating purposes. Not big programs with lots of requirements/classes/etc.

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  • Design Pattern Advice for Bluetooth App for Android

    - by Aimee Jones
    I’m looking for some advice on which patterns would apply to some of my work. I’m planning on doing a project as part of my college work and I need a bit of help. My main project is to make a basic Android bluetooth tracking system where the fixed locations of bluetooth dongles are mapped onto a map of a building. So my android app will regularly scan for nearby dongles and triangulate its location based on signal strength. The dongles location would be saved to a database along with their mac addresses to differentiate between them. The android phones location will then be sent to a server. This information will be used to show the phone’s location on a map of the building, or map of a route taken, on a website. My side project is to choose a suitable design pattern that could be implemented in this main project. I’m still a bit new to design patterns and am finding it hard to get my head around ones that may be suitable. I’ve heard maybe some that are aimed at web applications for the server side of things may be appropriate. My research so far is leading me to the following: Navigation Strategy Pattern Observer Pattern Command Pattern News Design Pattern Any advice would be a great help! Thanks

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  • Resources on how to relate structured and semi- / un-structured information

    - by Fritz Meissner
    I don't have a great background in information organisation / retrieval, but I know of a few ways of dealing with the problem. For structured information, it's possible to go OOish - everything "has-a" or "has-many" something else, and you navigate the graph to find relationships between things. For unstructured information, you have techniques like text search and tagging. What resources - articles or books - are there that summarise the CS theory behind these techniques or could introduce me to others? I'm developing a system that needs to handle capture and retrieval of information that ranges from necessarily unstructured (advice about X) to structured (list of Xs that relate to Ys) to a combination (Ys that relate to the advice about X) and I'd like to get some insight into how to do it properly.

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  • Justification for learning/implementing newer Microsoft technologies

    - by Darren
    I work at a large healthcare organization as a mid-level software developer. I have over 10 years experience in the IT industry using Microsoft technologies (ASP.NET & SQL Server). When I go to conferences, code camps, .net user group meetings, I hear of all kinds of new tools and technologies: MVC, LINQ, Entity Framework, WCF Web Services, etc. I guess you could say I'm in my comfort zone using the same old stuff from asp.net 2.0. I use typed datasets for my data access layer. I use web forms and feature rich server controls with master pages. I know how to use plain old SQL and create queries in my typed datasets to get at data my applications need. Throughout my career, I'm always sensitive to not become obsolete with my skill set. What I currently use works fine and my development time is fast. But I'm concerned that if I were to be laid off, I would be asked in interviews how many MVC apps I've written. Or how I am with LINQ or WCF web services. I know that it doesn't matter how many conferences, books, or videos I watch on some new technology...I have to implement/use it or it simply won't sink in. Also, managers who interview don't care how much someone reads up on something, only real use and experience with a technology. I have a new project to write. I've gone to my manager and have asked for additional time for the project for learning/implementing technology I may not be familiar with. Our organization encourages its employees to "learn and grow" and to continue are education. But I always get resistance when I ask for more time to ramp up on something new to implement. My manager is asking for concrete business reasons for implementing these new technologies. I don't have business reasons. My reasons are because I don't want to become obsolete. I could say it would make the project more maintainable in the future by other developers since at some point people could stop using these older technologies, but that' about all I can think of. Does Linq/Entity Framework/MCV apps perform better? So much so that the customers (users in departments I'm creating this app for) need? I doubt it. I'm interested in you guy's thoughts on this. Do many of you have similar plights with trying to use newer upcoming technologies? I doubt I'm on the bleeding edge of technology, either. Are there "business reasons" that you would bring to light for using these technologies? Thanks in advance! Sorry for the long wall of text.

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  • Dictionary as DataMember in WCF after installing .NET 4.5 [migrated]

    - by Mauricio Ulate
    After installing .NET Framework 4.5 with Visual Studio 2012, whenever I want to obtain the reference from a WCF service, my dictionaries are changed into arrays. For example, Dictionary<int, double> is changed into ArrayOfKeyValueOfintdoubleKeyValueOfintdouble. This happens in both Visual Studio 2012 and 2010 (both Express). I've reviewed my configuration and the dictionary data type in the service reference configuration is System.Collection.Generic.Dictionary. Changing this doesn't make a difference. Reverting to just using Visual Studio 2010 and .NET 4.0 is not an option.

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  • Single Responsibility Principle - How Can I Avoid Code Fragmentation?

    - by Dean Chalk
    I'm working on a team where the team leader is a virulent advocate of SOLID development principles. However, he lacks a lot of experience in getting complex software out of the door. We have a situation where he has applied SRP to what was already quite a complex code base, which has now become very highly fragmented and difficult to understand and debug. We now have a problem not only with code fragmentation, but also encapsulation, as methods within a class that may have been private or protected have been judged to represent a 'reason to change' and have been extracted to public or internal classes and interfaces which is not in keeping with the encapsulation goals of the application. We have some class constructors which take over 20 interface parameters, so our IoC registration and resolution is becoming a monster in its own right. I want to know if there is any 'refactor away from SRP' approach we could use to help fix some of these issues. I have read that it doesn't violate SOLID if I create a number of empty courser-grained classes that 'wrap' a number of closely related classes to provide a single-point of access to the sum of their functionality (i.e. mimicking a less overly SRP'd class implementation). Apart from that, I cannot think of a solution which will allow us to pragmatically continue with our development efforts, while keeping everyone happy. Any suggestions ?

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  • Is monkeypatching considered good programming practice?

    - by vartec
    I've been under impression, that monkeypatching is more in quick and dirty hack category, rather than standard, good programming practice. While I'd used from time to time to fix minor issues with 3rd party libs, I considered it temporary fix and I'd submit proper patch to the 3rd party project. However, I've seen this technique used as "the normal way" in mainstream projects, for example in Gevent's gevent.monkey module. Has monkeypatching became mainstream, normal, acceptable programming practice? See also: "Monkeypatching For Humans" by Jeff Atwood

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  • Order of learning sort algorithms

    - by user619818
    I have already studied bubblesort, insertion sort and selection sort and can implement them in C pretty much from knowledge of the algorithm. I want to go on to learn shellsort, merge sort, heapsort and quicksort, which I guess are a lot harder to understand. What order should I take these other sort algos? I am assuming a simpler sort algo helps learn a more complex one. Don't mind taking on some others if it helps the learning process.

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  • signal processing libraries

    - by khinester
    Are there any open source libraries/projects which work in a similar way to http://www.tagattitude.fr/en/products/technology? I am trying to understand the process. At first I thought this could work like when you send a fax to a fax machine. It is basically using the mobile phone’s microphone as a captor and its audio channel as a transporter. Are there any libraries for generating the signal and then being able to decode it?

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  • How do I overcome paralysis by analysis when coding?

    - by LuxuryMode
    When I start a new project, I often times immediately start thinking about the details of implementation. "Where am I gonna put the DataBaseHandler? How should I use it? Should classes that want to use it extend from some Abstract superclass..? Should I an interface? What level of abstraction am I going to use in my class that contains methods for sending requests and parsing data?" I end up stalling for a long time because I want to code for extensibility and reusability. But I feel it almost impossible to get past thinking about how to implement perfectly. And then, if I try to just say "screw it, just get it done!", I hit a brick wall pretty quickly because my code isn't organized, I mixed levels of abstractions, etc. What are some techniques/methods you have for launching into a new project while also setting up a logical/modular structure that will scale well?

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