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• Aspect-oriented Programming and Code Contracts in ASP.NET MVC

  There are some aspects to application programming, such as logging, tracing, profiling, authentication and authorization that cut across the business objects. These are difficult to deal with in an object-oriented paradigm without resorting to code-injection, code-duplication or interdependencies. In ASP.NET MVC, you can use attributes in the form of action filters to provide a neater way of implementing these cross-curring concerns.

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• Offset Forward vector of object based on Rotation

  - by Taylor

  I'm using the Bullet 3D physics engine in a iOS application running openGL ES 1.1 Currently I'm accepting info from the gyroscope to allow the user to "look around" a 3d world that follows a bouncing ball (note: it only takes in the yaw to look around 360 degrees). Im also accepting information from the accelerometer based on the tilt to push the ball. As of right now, to move forward, the user tilts the devise forward (using the accelerometer); to move to the right, the user tilts the devise to the right and so on. The forward vector is currently along it's local Z-axis. The problem is that I want to change the ball bounce based on where the user has changed the view. If I change the view, the ball bounces in the fixed direction. I want to change the forward facing direction so that when a user changes the view (say to the look at the right of the world, the user rotates the device), tilting the devise forward will result in a forward force in that direction. Basically, I want the forward vector to take the rotation into consideration. Sorry if I didn't explain the issue well enough, its kind of confusing to write down.

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• Materials from Parallel Programming Pattern Presentation at Charlottesville .NET User Group Meeting

  - by John Blumenauer

  On Thursday, May 27, I had the privilege of presenting “A Look at Parallel Programming Patterns” at the Charlottesville .NET User Group’s monthly meeting.  Those folks in attendance had many great questions and were obviously very interested in what the Parallel Task Library has to offer.  The code and slides can be found HERE.  Thanks again to CHODOTNET for having me in town to speak.  If you experience any problems downloading the slides or code, please let me know.

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• Am I getting Scheme wrong?

  - by nischayn22

  Inspired by the numerous posts about the importance of learning Lisp/Scheme I started to learn Scheme two days back, I am using the book "The little Schemer" and have completed half of it. But I still haven't learned anything new, the book teaches about recursion which I already understand and uses lambda (which I can think of a way to define a function in C). I still haven't got the concept of functional programming (please point to some example of functional compared to normal programming methods in C/C++ so I can get it). Am I learning in the wrong way? or is "The little Schemer" for a newbie in programming and I should look for some other books?

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• Generating HTML Help files based on XML documentation

  - by geekrutherford

  Since discovering the XML commenting features built into .NET years ago I have been using it to help make my code more readable and simpler for other developers to understand exactly what the code is doing. Entering /// preceding a line of code causes Visual Studio to insert "summary" tags.  It also results in additional tags being generated if you are commenting a method with parameters and a return type. I already knew that Intellisense would pick up these comments and display them when coding and selecting properties, methods, etc. from a class.  I also knew that you could set Visual Studio to generate an XML file containing said comments.  Only recently did I begin to wonder if I could generate some kind of readable help files based on these comments I so diligently added. After searching the web I came across NDoc, an open source project which creates documentation for you based on the XML files generated by Visual Studio.  Unfortunately, NDoc has become stale and no longer supported (last release was back in 2005). Fortunately there is a little known tool from Microsoft themselves called "Sandcastle Help File Builder".  This nifty little tool gives you a graphical interface that allows you to specify multiple DLL and XML files from which to generate a MSDN like HTML Help File for your own projects! You can check it out here: http://shfb.codeplex.com/ If you are curious how to set Visual Studio to generate the above reference XML documentation files simply go to your projects property page and edit as shown below (my paths are specific, you can leave yours at the default values):

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• High paid non-finance programming roles? [closed]

  - by Ian

  Besides finance (front-office/high frequency trading) developer roles, are there any other very well paid programming roles, specifically for C++ or Java? One particular industry I would find interesting is the energy industry? However, I completed an internship for one of the massive energy companies and their "IT department" was nothing more than Microsoft Access- they outsourced all the technical work to IBM and Accenture. EDIT: USD 110k+ Defense would sounds great except the fact I am not a US citizen :)

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• Help w/ iPad 1 performance for tile-based DOM Javascript game

  - by butr0s

  I've made a 2D tile-based game with DOM/Javascript. For each level, the map data is loaded and parsed, then lots of tiles ( elements) are drawn onto a larger "map" element. The map is inside of a container that hides overflow, so I can move the map element around by positioning it absolutely. Works a treat on desktop browsers, and my iPad 2. My problem is that performance is really bad on iPad 1. The performance hit is directly related to all the tile elements in my map, because when I remove or reduce the number of tiles drawn, performance improves. Optimizing my collision detection loop has no effect. My first thought was to batch groups of tiles into containers, then hide/show them based on proximity to the player, however this still causes a huge hiccup when the player moves and a new group of tiles is displayed (offscreen). Actually removing the out-of-sight elements from the DOM, then re-adding them as necessary is no faster. Anyone know of any tips that might speed up DOM performance here? My map is 1920 x 1920 pixels, so as far as I know should be within the WebKit texture limit on iOS 5/iPad. The map is being moved with CSS3 transforms, and I've picked all the other obvious low-hanging fruit.

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• What are the advantages and Disadvantages of Using an Aspect Orientated Programming Paradigm

  - by JHarley1

  Ok so here is the question: What are the advantages and Disadvantages of Using an Aspect Orientated Programming Paradigm. My advantages and disadvantages thus far: Advantages: Complements object orientation. Modularizes cross-cutting concerns improving code maintainability and understandability. Disadvantage: Not the easiest of concepts to grasp - not as well documented as O-O O-O goes far enough in the separation of concerns... List item Would anyone like to challenge any of these/ add their own? Many Thanks, J

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• How to choose between using a Domain Event, or letting the application layer orchestrate everything

  - by Mr Happy

  I'm setting my first steps into domain driven design, bought the blue book and all, and I find myself seeing three ways to implement a certain solution. For the record: I'm not using CQRS or Event Sourcing. Let's say a user request comes into the application service layer. The business logic for that request is (for whatever reason) separated into a method on an entity, and a method on a domain service. How should I go about calling those methods? The options I have gathered so far are: Let the application service call both methods Use method injection/double dispatch to inject the domain service into the entity, letting the entity do it's thing and then let it call the method of the domain service (or the other way around, letting the domain service call the method on the entity) Raise a domain event in the entity method, a handler of which calls the domain service. (The kind of domain events I'm talking about are: http://www.udidahan.com/2009/06/14/domain-events-salvation/) I think these are all viable, but I'm unable to choose between them. I've been thinking about this a long time and I've come to a point where I no longer see the semantic differences between the three. Do you know of some guidelines when to use what?

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• Location-Based redirection and duplication in sub-directories affecting SEO

  - by Joshua

  I currently own the website www.xyz.com. The website has a sub-directory for each of the 3 target countries: .../en-US/ (United States), .../es-MX/ (Mexico), and .../es-DO/ (Dominican Republic). I have two main questions about this setup: Currently, the main domain/root (xyz.com) contains a blank index.php file, but I would like for a user to be redirected to one of the sub-directories based on their regional location. What is the best way to accomplish this? I have looked at using browser language-based redirection, but how would I know whether to direct a user to the MX or DO site if the browser language is set to spanish? Is there a way to detect a user's geographic location? Also, the 3 websites are practically identical except they all have 3 unique color schemes and the US site is in english while the MX and DO sites are in spanish. My problem is that I believe GoogleBot is penalizing/banning my site because the spanish text on the MX and DO pages are nearly identical and are thus marked as duplicates/spam. Is there a way to avoid this?

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• Programming MVC2 is out with code

  The sample code for my latest book Programming ASP.NET MVC (covers version 2 and 2010) is available via the book's catalog page at Microsoft Press site run by O'Reilly.  You click the Examples link here to get to it: http://oreilly.com/catalog/9780735627147/...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• Read about Interface-Based Programming in C#

  - by Editor

  Learn to program using interfaces by reading C# Online.NET articles like Interfaces and Abstract Classes. And, here is an excerpt from a VSLive! article on Interface-Based Programming in C#. "Interfaces help define a contract, or agreement, between your application and other objects. This agreement indicates what sort of methods, properties and events are exposed by an object. [...]

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• Getting Started with Component Architecture: DI?

  - by ashes999

  I just moved away from MVC towards something more component-architecture-like. I have no concept of messages yet (it's rough prototype code), objects just get internal properties and values of other classes for now. That issue aside, it seems like this is turning into an aspect-oriented-programming challenge. I've noticed that all entities with, for example, a position component will have similar properties (get/set X/Y/Z, rotation, velocity). Is it a common practice, and/or good idea, to push these behind an interface and use dependency injection to inject a generic class (eg. PositionComponent) which already has all the boiler-plate code? (I'm sure the answer will affect the model I use for message/passing)

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• Basic Facts About Ruby on Rails Programming Language

  The saying "Feels lighter, more agile, and easier to understand" has become the definition for ruby on rails. Many people still don't know that ror is otherwise called as ruby on rails. Let's learn more about the basic facts of ruby on rails, the lightening fast programming language today.

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• General programming techniques to speed up coding time

  - by mcwise

  I am preparing for a programming contest in C++ where it is all about producing working code in a short time. An example would be to use a macro to get the minimum of two ints(but I was told that you shouldn't use macros as they are not type-safe) or using memsets to initialize arrays (but I was told that you shouldn't use memsets in C++). This leads to the question, what kind of coding techniques exist to use at a real job?

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• Role based access to resources for a RESTful service

  - by mutex

  I'm still wrapping my head around REST, but I wonder if someone can help with any suggestions or approaches to role based access control for a RESTful service, particularly from the point of view of securing the data and how the URLs might look. It's probably best to consider an example: Say I have a REST service for Customers, and want to split the users of this REST service into Admin, Editor and Reader roles: Admins can change all attributes of a Customer resource Editors can change only some Readers can only view them. Access control rights are assigned to the Customers entities individually. So for example a user of the service might have admin rights to Customers 1,2 and 3 but Editor access to 4,5 and Reader access to 7,8,9. Now consider the user calling the service. What is a good way to seperate the list of Customers for the current User? GET /Customer - this might get a list of all customers that the current user has Admin\Editor\Reader access to. But then on each Customer the consumer would need an indication of what role they have. Or would it be "better" having something like GET /Customer/Admin - return all customers the current user has Admin access to. Just looking for some high level pointers or reading on a decent way to secure\filter the resources based on roles of the current user.

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• Getting my younger brother started on programming

  - by SmartLemon

  My younger brother is 13 years old, I started programming when I started to develop Android applications when I was 15, last year my brother gained an interest in it and he would always pestering me about letting him make something himself, so I wrote him a few tutorials and he built himself a small application that had a few buttons that did something, I think you put in your dob and it would tell you what day you were born on, he took a couple of days building up to his final application, maybe even a week, learning everything he needed. Since then he hasn't really done much more because I have been engulfed in work and such where I have my own programming problems to sort out. I told him that when he was my age (I am 17) that he should be better then me, he was a bit sceptical about this however. I dont think he has as much logical reasoning as I would think he needs to solve more complex problems, but shouldnt that just develop over time as it did with me? He has been pestering me for the past week or something to write him more tutorials, but I didn't have time. All I had with me was a playlist I had downloaded from the new boston from youtube for C++, it's about 73 videos. He is currently about 20-30 videos in, he has come to ask me a few questions about it and thats it. Should I have really properly started him with C++? Should I stop him now and start him again on python or ruby? I know that C++ shouldn't really be a beginners language, especially for someone who is only 13, by the time this question is answered will probably be up to learning about inheritance or something. Some people may see this as not a real question, but it is, and should be used as a reference for others. I want to know, should I start him on a different language whch is more easy? What language then? And would it be better for me to teach him myself (I would make time) or just continue him with the new boston? There are a few more questions throughout this question but these are the main ones. Part of the question people seem to be neglecting is me asking whether I should change what language he is learning to another, or since he is already pretty far through the tutorials should I just leave him with C++ and he can learn the other languages freely by himself?

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• Programming tourism

  - by Andrew_B

  I'm going on vacation to Paris, France for 10 days. Actually, it's my girlfriend's wish to go there but I'm not very interested in visiting, sightseeing, etc. Recently, I came up with an idea of trying to do something like programming tourism. :) I'd like to do something related to programming in a startup-like company. I do not want a salary or any kind of compensation. I want to overview process, social aspects, environment and "what it feels like" to development software in another country. I'm from Russia. I've been a software developer since 2003. I prefer C#4 but I'm ready to use anything Turing-complete. I have some MS certifications and am familiar with all .NETs since 1.1. Currently I'm finishing PhD in CS. I'm interested in multidimensional indexing and I can turn any piece of data and code to OLAP system. :) But it'd take too much time. What can I do? I have no more than one week. I want a totally complete project in a short amount of time. Implement some features in well-tested project Do a code review Debug memory, performance and concurrency issues Do unit testing So, about the questions: Is it legal? I'm ready to sign NDA if it's necessary. I'll have tourist visa. Is it possible? I'm really sure that bureaucratic companies with lots of HRs and PMs will not allow such experiments. But small companies can afford it. I'm ready to guarantee support on my code after leaving home :) P.S. I still havn't started learning French :) I hope it will not take too much time :) P.P.S. Yes, it's girlfriend-approved. What's in it for me? It's fun. It's fun to see new systems and people who created them. It's fun to complete meaningful things. Quickly. What's in it for them? Feature, debug, review or test. If my short-term colleagues will like this style of working I can invite them to make same trip into my company :) I think in Russia it's even more exciting :)

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• Basic Facts About Ruby on Rails Programming Language

  The saying "Feels lighter, more agile, and easier to understand" has become the definition for ruby on rails. Many people still don't know that ror is otherwise called as ruby on rails. Let's learn more about the basic facts of ruby on rails, the lightening fast programming language today.

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• Make Your Site Come Alive With PHP Programming

  Are you looking out to learn more about hypertext preprocessor programming which is nothing other than what is known as PHP? Then this article can offer you plenty of knowledgeable information on the same. PHP has literally become the talk of the town nowadays.

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• Overused or abused programming techniques

  - by Anto

  Are there any techniques in programming that you find to be overused (IE used way more excessively than what they should be) or abused, or used a bit for everything, while not being a really good solution to many of the problems which people attempt to solve with it. It could be regular expressions, some kind of design pattern or maybe an algorithm, or something completely different. Maybe you think people abuse multiple inheritance etc.

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• Matching users based on a series of questions

  - by SeanWM

  I'm trying to figure out a way to match users based on specific personality traits. Each trait will have its own category. I figure in my user table I'll add a column for each category: id name cat1 cat2 cat3 1 Sean ? ? ? 2 Other ? ? ? Let's say I ask each user 3 questions in each category. For each question, you can answer one of the following: No, Maybe, Yes How would I calculate one number based off the answers in those 3 questions that would hold a value I can compare other users to? I was thinking having some sort of weight. Like: No -> 0 Maybe -> 1 Yes -> 2 Then doing some sort of meaningful calculation. I want to end up with something like this so I can query the users and find who matches close: id name cat1 cat2 cat3 1 Sean 4 5 1 2 Other 1 2 5 In the situation above, the users don't really match. I'd want to match with someone with a +1 or -1 of my score in each category. I'm not a math guy so I'm just looking for some ideas to get me started.

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• Make Your Site Come Alive With PHP Programming

  Are you looking out to learn more about hypertext preprocessor programming which is nothing other than what is known as PHP? Then this article can offer you plenty of knowledgeable information on the same. PHP has literally become the talk of the town nowadays.

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• Someone who needs inspiration [on hold]

  - by Anestis

  My apologies if it is not a code problem. However, it is a problem that concerns programming. As a recently graduated Computer Systems Engineering I have gained some basic knowledge with programming using JAVA. I have realised 2 things, the first one is that I realy liked programming and the second is that I am not good at all. More specifically, I struggle on problem solving and when i face complex tasks I feel lost. Every day , I spend some quality time doing simple exercises in order to be more familiar with JAVA. My target is to become a good programmer and find a job on a software company. I am afraid maybe " I dont have it" thats why I am asking you , what should I do? Should i give up? Thanks in advance, Anestis

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• What are the difference between: agent, actor, dataflow based programming?

  - by inf3rno

  What are the difference between the following terms? agent-based programming agent-based programming with microagents actor-based programming actor-based programming with lightweight actors dataflow based programming It is hard to find comparing articles and they are very similar. Afaik they have different constraints and they are implemented on a different abstraction level, but I need some reassurance...

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