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• XMLFoundation

  As the name suggests it provides a foundation for XML support in an application, however this is much more than just another XML parser. It applies a unique approach to handling XML that allows your application code to focus on the application rather than traversing DOM or subscribing to SAX events

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• Point line collision reaction

  - by user4523

  I am trying to program point line segment collision detection and reaction. I am doing this for fun and to learn. The point moves (it has a velocity, and can be controlled by the user), whilst the lines are strait and stationary. The lines are not axis aligned. Everything is in 2D. It is quite straight forward to work out if a collision has occurred. For each frame, the point moves from A to B. AB is a line, and if it crosses the line segment, a collision has occurred (or will occur) and I am able to work out the point of intersection (poi). The problem I am having is with the reaction. Ideally I would like the point to be prevented from moving across the line. In one frame, I can move the point back to the poi (or only alow it to move as far as the poi), and alter the velocity. The problem I am having with this approach (I think) is that, next frame the user may try to cross the line again. Although the point is on the poi, the point may not be exactly on the line. Since it is not axis aligned, I think there is always some subtle rounding issue (A float representation of a point on a line might be rounded to a point that is slightly on one side or the other). Because of this, next frame the path might not intersect the line (because it can start on the other side and move away from it) and the point is effectively allowed to cross the line. Firstly, does the analysis sound correct? Having accepted (maybe) that I cannot always exactly position the point on the line, I tried to move the point away from the line slightly (either along the normal to the line, or along the path vector). I then get a problem at edges. Attempting to fix one collision by moving the point away from the line (even slightly) can cause it to cross another line (one shape I am dealing with is a star, with sharp corners). This can mean that the solution to one collision inadvertently creates another collision, which is ignored. Again, does this sound correct? Anyway, whatever I try, I am having difficulty with edges, and the point is occasionally able to penetrate the polygons and cross lines, which is undesirable. Whilst I can find a lot of information about collision detection on the web (and on this site) I can find precious little information on collision reaction. Does any one know of any good point line collision reaction tutorials? Or is my approach too flawed/over complicated?

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• Which swing testing frameworks are well suited to TDD?

  - by Niel de Wet

  I am trying to follow a BDD/TDD approach to developing an IntelliJ IDEA plugin, and in order to do a full acceptance test I want to exercise my plugin through the GUI. I know that I can do it using Window Licker, but looking at the commit log there hasn't been any activity since 2010. I see there are several other frameworks, but which are current and suited for TDD? If you have any experience with swing and TDD, please share those as well.

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• ADO.NET Data Services business logic processing

  a simple approach that provides business logic processing before forwarding data to the clients with ADO.NET Data Services.  read moreBy Siyamand AyubiDid 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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• User input and Automated input seperation

  - by tpaksu

  I have a mysql db and I have an automation script which modifies the data inside once a day. And, these columns may have changed by an user manually. What is the best approach to make the system only update the automated data, not the manually edited ones? I mean yes, flagging the cell which is manually edited is one way to do it, but I want to know if there's another way to accomplish this? Just curiosity.

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• How to refactor a method which breaks "The law of Demeter" principle?

  - by dreza

  I often find myself breaking this principle (not intentially, just through bad design). However recently I've seen a bit of code that I'm not sure of the best approach. I have a number of classes. For simplicity I've taken out the bulk of the classes methods etc public class Paddock { public SoilType Soil { get; private set; } // a whole bunch of other properties around paddock information } public class SoilType { public SoilDrainageType Drainage { get; private set; } // a whole bunch of other properties around soil types } public class SoilDrainageType { // a whole bunch of public properties that expose soil drainage values public double GetProportionOfDrainage(SoilType soil, double blockRatio) { // This method does a number of calculations using public properties // exposed off SoilType as well as the blockRatio value in some conditions } } In the code I have seen in a number of places calls like so paddock.Soil.Drainage.GetProportionOfDrainage(paddock.Soil, paddock.GetBlockRatio()); or within the block object itself in places it's Soil.Drainage.GetProportionOfDrainage(this.Soil, this.GetBlockRatio()); Upon reading this seems to break "The Law of Demeter" in that I'm chaining together these properties to access the method I want. So my thought in order to adjust this was to create public methods on SoilType and Paddock that contains wrappers i.e. on paddock it would be public class Paddock { public double GetProportionOfDrainage() { return Soil.GetProportionOfDrainage(this.GetBlockRatio()); } } on the SoilType it would be public class SoilType { public double GetProportionOfDrainage(double blockRatio) { return Drainage.GetProportionOfDrainage(this, blockRatio); } } so now calls where it used would be simply // used outside of paddock class where we can access instances of Paddock paddock.GetProportionofDrainage() or this.GetProportionOfDrainage(); // if used within Paddock class This seemed like a nice alternative. However now I have a concern over how would I enforce this usage and stop anyone else from writing code such as paddock.Soil.Drainage.GetProportionOfDrainage(paddock.Soil, paddock.GetBlockRatio()); rather than just paddock.GetProportionOfDrainage(); I need the properties to remain public at this stage as they are too ingrained in usage throughout the code block. However I don't really want a mixture of accessing the method on DrainageType directly as that seems to defeat the purpose altogether. What would be the appropiate design approach in this situation? I can provide more information as required to better help in answers. Is my thoughts on refactoring this even appropiate or should is it best to leave it as is and use the property chaining to access the method as and when required?

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• Bing Search Engine Optimization Tips

  Microsoft's introduction of Bing completely transformed our conventional ways of website optimization. Websites will have a new approach to search engine optimization, where there no longer be a need to submit your website to popular search engines or even get links from external sources just for your website to get indexed.

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• Evolving Architectures Part II but Design is emergent

  This is part II of a series on agile architecture. You can read part I here.In the previous installment I provided a definition for software architecture and raised the apparent friction between the up front design implied by software architecture and the YAGNI approach and deferred requirements prompted by agile development in the large. This [...]...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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• SSIS Training Comes to NYC 30 Jul-3 Aug!

  - by andyleonard

  Linchpin People is excited to announce the scheduling of From Zero To SSIS in New York City 30 Jul – 03 Aug 2012! Training Description From Zero to SSIS was developed by Andy Leonard to train technology professionals in the fine art of using SQL Server Integration Services (SSIS) to build data integration and Extract-Transform-Load (ETL) solutions. The training is focused around labs and emphasizes a hands-on approach. Most technologists learn by doing; this training is designed to maximize the time...(read more)

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• Should I disallow(robots.txt) archive/author pages with links already available on the front page? [on hold]

  - by WPRookie82

  I am working on a simple Wordpress blog where when an article is published, it appears on ALL these pages: Homepage - Headline(clickable) + 3-line summary Parent category page - Headline(clickable) + 3-line summary Child category page - Headline(clickable) + 3-line summary Author page - Headline(clickable) sitemap.xml I've been told that I should add all author pages to my robots.txt, under disallow, so as search engine bots do not spider /author/* since all links on these pages are available elsewhere. Is this a good approach or maybe rel=nofollow is better, or maybe I shouldn't worry about this at all?

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• SQL Server 2012 Integration Services - Package and Project Parameters

  In SQL Server 2012, Microsoft introduced SQL Server Data Tools to accommodate the dynamic nature of SSIS constructs in the form of package and project parameters. This approach lets you combine multi-package projects into a single unit, eliminating the possibility of breaking dependencies between parent and child packages during subsequent deployments. Get smart with SQL Backup ProGet faster, smaller backups with integrated verification.Quickly and easily DBCC CHECKDB your backups. Learn more.

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• Play Framework Plugin for NetBeans IDE (Part 2)

  - by Geertjan

  After I published part 1 of this series, the first external contribution (i.e., not by me) to the NetBeans plugin for Play Framework 2 was committed today. Yann D'Isanto added support for creating new Play projects: That completely solves a problem I was working on, in a different way altogether. I was working on creating a new wizard that would call "play new" on the command line and pass into the command line the entered name and application type (1 for Java and 2 for Scala). However, Yann's solution is better, at least in the sense in that it works, as opposed to mine which didn't, because of problems I continually had with the command line, since one needs to press Enter multiple times on the Play command line when creating new projects, which I wasn't able to simulate in my new wizard. Yann's approach is simply to follow the approach taken in the Project Type Module Tutorial, which explains how to register a project sample in the IDE. I was inspired by Yann's contribution, especially when he mentioned that one needs to build Play projects on the command line. So, I added a new menu item on the right-click of a project for building Play projects, which simply passes "play compile" to the command line for the current project: Via the IDE's main menu bar, you can also Build and Run the application, though the code for the Clean function needs to be added still, which would be a cool thing for anyone out there to add, by using all the existing code and then passing "play clean compile" to the command line. Something else that Yann added is an Options Window extension, thanks to the Options Window Module Tutorial, for registering the Play installation, which is a step forward from my hard coded solution. I changed things slightly so that, when Build or Run are selected, without a Play installation being defined, the Options window opens, displaying the tab that Yann created, shown below. Notice that there's no Browse button, which would be a simple next step for anyone else to contribute. A small tip is to use the FileChooserBuilder from the NetBeans IDE APIs when working on the Browse button: Looking forward to more contributions to the Play Framework 2 plugin for NetBeans IDE. Just leave a message here with your ideas, with your java.net name, and then I'll add you to the project on java.net, where I very much look forward to your contributions: http://java.net/projects/nbplay/sources/nbplay

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• "Expecting A Different Result?" (2 of 3 in 'No Customer Left Behind' Series)

  - by Kathryn Perry

  A guest post by David Vap, Group Vice President, Oracle Applications Product Development Many companies already have some type of customer experience initiative in process or one that could be framed as such. The challenge is that the initiatives too often are started in a department silo, don't have the right level of executive sponsorship, or have been initiated without the necessary insight and strategic business alignment. You can't keep doing the same things, give it a customer experience name, and expect a different result. You can't continue to just compete on price or features - that is not sustainable in commoditized markets. And ultimately, investing in technology alone doesn't solve customer experience problems; it just adds to the complexity of them. You need a customer experience strategy and approach on how to execute a customer-centric worldview within your business. To develop this, you must take an outside in journey on how your customers are interacting with your business to establish a benchmark of your customers' experiences. Then you must get cross-functional alignment on what you are trying to achieve, near, mid, and long term. Your execution of that strategy should be based on a customer experience approach: Understand your customer: You need to capture the insights across interactions, channels (including social), and personas to better understand whom to serve, how to serve them, and when to serve them. Not all experiences or customers are equal, so leverage this insight to understand the strategic business objectives you need to address. Then determine which experiences can be improved immediately and which over time to get the result you need. Empower your ecosystem: You need to align your front-line employees with your strategy and give them the power, insight, and tools that allow them to cultivate a culture around strengthening the relationships with your customers. You also need to provide the transparency, access, and collaboration that enable your customers and partners to self serve and self solve and to share with ease. Adapt your business: You need to enable the discipline of agility within your organization and infrastructure so that you can innovate, tailor, and personalize experiences. This needs to be done both reactively from insight and proactively in real time so you can stay ahead of shifting market trends and evolving consumer behaviors. No longer will the old approaches provide the same returns. To compete, differentiate, and win in a world where the customer has the power, you must execute a strategy that is sure to deliver a better brand experience for your customers. Note: This is Part 2 in a three-part series. Part 1 is here. Stop back for Part 3 on November 28.

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• PHP - Internal APIs/Libraries - What makes sense?

  - by Mark Locker

  I've been having a discussion lately with some colleagues about the best way to approach a new project, and thought it'd be interesting to get some external thoughts thrown into the mix. Basically, we're redeveloping a fairly large site (written in PHP) and have differing opinions on how the platform should be setup. Requirements: The platform will need to support multiple internal websites, as well as external (non-PHP) projects which at the moment consist of a mobile app and a toolbar. We have no plans/need in the foreseeable future to open up an API externally (for use in products other than our own). My opinion: We should have a library of well documented native model classes which can be shared between projects. These models will represent everything in our database and can take advantage of object orientated features such as inheritance, traits, magic methods, etc. etc. As well as employing ORM. We can then add an API layer on top of these models which can basically accept requests and route them to the appropriate methods, translating the response so that it can be used platform independently. This routing for each method can be setup as and when it's required. Their opinion: We should have a single HTTP API which is used by all projects (internal PHP ones or otherwise). My thoughts: To me, there are a number of issues with using the sole HTTP API approach: It will be very expensive performance wise. One page request will result in several additional http requests (which although local, are still ones that Apache will need to handle). You'll lose all of the best features PHP has for OO development. From simple inheritance, to employing the likes of ORM which can save you writing a lot of code. For internal projects, the actual process makes me cringe. To get a users name, for example, a request would go out of our box, over the LAN, back in, then run through a script which calls a method, JSON encodes the output and feeds that back. That would then need to be JSON decoded, and be presented as an array ready to use. Working with arrays, as appose to objects, makes me sad in a modern PHP framework. Their thoughts (and my responses): Having one method of doing thing keeps things simple. - You'd only do things differently if you were using a different language anyway. It will become robust. - Seeing as the API will run off the library of models, I think my option would be just as robust. What do you think? I'd be really interested to hear the thoughts of others on this, especially as opinions on both sides are not founded on any past experience.

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• ASP.NET Scheduler: How To Implement End-User Restrictions

  Check out this 2 step approach to prevent users from editing appointments in the ASPxScheduler: Step 1: Choose Restriction First decide which action in the ASPxScheduler you want to prevent. Heres a list of the available ones: AllowAppointmentConflicts AllowAppointmentCopy AllowAppointmentCreate AllowAppointmentDelete AllowAppointmentDrag AllowAppointmentDragBetweenResources AllowAppointmentEdit AllowAppointmentMultiSelect AllowAppointmentResize AllowInplaceEditor...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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• Entity Framework 5, separating business logic from model - Repository?

  - by bnice7

  I am working on my first public-facing web application and I’m using MVC 4 for the presentation layer and EF 5 for the DAL. The database structure is locked, and there are moderate differences between how the user inputs data and how the database itself gets populated. I have done a ton of reading on the repository pattern (which I have never used) but most of my research is pushing me away from using it since it supposedly creates an unnecessary level of abstraction for the latest versions of EF since repositories and unit-of-work are already built-in. My initial approach is to simply create a separate set of classes for my business objects in the BLL that can act as an intermediary between my Controllers and the DAL. Here’s an example class: public class MyBuilding { public int Id { get; private set; } public string Name { get; set; } public string Notes { get; set; } private readonly Entities _context = new Entities(); // Is this thread safe? private static readonly int UserId = WebSecurity.GetCurrentUser().UserId; public IEnumerable<MyBuilding> GetList() { IEnumerable<MyBuilding> buildingList = from p in _context.BuildingInfo where p.Building.UserProfile.UserId == UserId select new MyBuilding {Id = p.BuildingId, Name = p.BuildingName, Notes = p.Building.Notes}; return buildingList; } public void Create() { var b = new Building {UserId = UserId, Notes = this.Notes}; _context.Building.Add(b); _context.SaveChanges(); // Set the building ID this.Id = b.BuildingId; // Seed 1-to-1 tables with reference the new building _context.BuildingInfo.Add(new BuildingInfo {Building = b}); _context.GeneralInfo.Add(new GeneralInfo {Building = b}); _context.LocationInfo.Add(new LocationInfo {Building = b}); _context.SaveChanges(); } public static MyBuilding Find(int id) { using (var context = new Entities()) // Is this OK to do in a static method? { var b = context.Building.FirstOrDefault(p => p.BuildingId == id && p.UserId == UserId); if (b == null) throw new Exception("Error: Building not found or user does not have access."); return new MyBuilding {Id = b.BuildingId, Name = b.BuildingInfo.BuildingName, Notes = b.Notes}; } } } My primary concern: Is the way I am instantiating my DbContext as a private property thread-safe, and is it safe to have a static method that instantiates a separate DbContext? Or am I approaching this all wrong? I am not opposed to learning up on the repository pattern if I am taking the total wrong approach here.

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• Multiple database accesses or one massive access?

  - by DudeOnRock

  What is a better approach when it comes to performance and optimal resource utilization: accessing a database multiple times through AJAX to only get the exact information needed when it is needed, or performing one access to retrieve an object that holds all information that might be needed, with a high probability that not all is actually needed? I know how to benchmark the actual queries, but I don't know how to test what is best when it comes to database performance when thousands of users are accessing the database simultaneously and how connection pooling comes into play.

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• Chapter 5: From 2005 to 2010: Business Logic and Data

  After reading this chapter, you will be able to Use the Entity Framework (EF) to build a data access layer using an existing database or with the Model-First approach .Generate entity types from the Entity Data Model (EDM) Designer using the ADO.NET Entity Framework POCO templates. Get data from Web services Learn about data caching using the Microsoft Windows Server AppFabric (formerly known by the codename “Velocity”)

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• Should I use multiple column primary keys or add a new column?

  - by Covar

  My current database design makes use of a multiple column primary key to use existing data (that would be unique anyway) instead of creating an additional column assigning each entry an arbitrary key. I know that this is allowed, but was wondering if this is a practice that I might want to use cautiously and possibly avoid (much like goto in C). So what are some of the disadvantages I might see in this approach or reasons I might want a single column key?

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• Determining whether a visitor reached two different pages in one visit

  - by Shaun

  I have a funnel that I would like to track. Tracking this funnel won't work with the default "goal funnel" tracking in Google due to the fact that I am mixing events and pageviews. As such, I've created a series of reports: Visits to demo pages - An inclusion filter on "Page". Triggers an Event on these pages - An inclusion filter on "Page" and "Event Category". Does not bounce - An inclusion filter on "Page" and an exclusion filter on "Exit Page" for these same pages. Reach our storefront - ?? Purchase something - An inclusion filter on "Page" and a report that shows "Transactions". At a basic level, I need to track users who reached demo pages, then reached any page on our store. Intuitively, I created a segment, used two inclusive "Page" filters (one for the demo pages and one for any page in our store), and combined them with an "AND" operator. I thought this was working until I tried to do the same thing in a dashboard widget and on a custom report. When I tried the same thing in those areas, I got zero results. I figured this might be because widgets and custom report filters function differently from segment filters (the options are different for all of them), so I tried applying my "demo page && store page" segment to a report that gave me a general page list. All I saw was a list of the specific pages. I tried simplifying things by creating a custom report that showed all visits to store pages, then applied a segment that filtered for users who visited demo pages. This got me the same numbers as my "demo page && store page" segment, but showed a list of demo pages. This has led me to believe that the "demo page && store page segment" approach and the "demo segment && store report" functionally behave the same. However, this experience has left me questioning whether they're giving me what I want. Are these methods showing me all users who reached both sets of pages? Is there a better/easier/more standard way of doing this aside from looking at visitor flow reports? I'm trying to avoid a combination of custom variables/events and using the horizontal funnel approach since it would consume a large number of our limited goals and seems more complicated than is necessary for tracking this funnel.

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• F# and the useful infinite Sequence (I think)

  - by MarkPearl

  So I have seen a few posts done by other F# fans on solving project Euler problems. They looked really interesting and I thought with my limited knowledge of F# I would attempt a few and the first one I had a look at was problem 5. Which said : “2520 is the smallest number that can be divided by each of the numbers from 1 to 10 without any remainder. What is the smallest number that is evenly divisible by all of the numbers from 1 to 20?” So I jumped into coding it and straight away got stuck – the C# programmer in me wants to do a loop, starting at one and dividing every number by 1 to 20 to see if they all divide and once a match is found, there is your solution. Obviously not the most elegant way but a good old brute force approach. However I am pretty sure this would not be the F# way…. So after a bit of research I found the Sequences and how useful they were. Sequences seemed like the beginning of an approach to solve my problem. In my head I thought - create a sequence, and then start at the beginning of it and move through it till you find a value that is divisible by 1 to 20. Sounds reasonable? So the question is begged - how would you create a sequence that you are sure will be large enough to hold the solution to the problem? Well… You can’t know! Some more googling and I found what I would call infinite sequences – something that looks like this… let nums = 1 |> Seq.unfold (fun i -> Some (i, i + 1))   My interpretation of this would be as follows… create a sequence, and whenever it is called add 1 to its size (I would appreciate someone helping me on wording this right functionally). Something that I don’t understand fully yet is the forward pipe operator (|>) which I think plays a key role in this code. With this in hand I was able to code a basic optimized solution to this problem. I’m going to go over it some more before I post the full code just in case!

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• TechEd 2014 Day 1

  - by John Paul Cook

  Today at TechEd 2014, many people had questions about the in-memory database features in SQL Server 2014. A common question is how an in-memory database is different from having a database on a SQL Server with an amount of ram far greater than the size of the database. In-memory or memory optimized tables have different data structures and are accessed differently using a latch free and lock free approach that greatly improves performance. This provides part of the performance improvement. The rest...(read more)

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• Is it ok to nofollow all outbound links? [duplicate]

  - by Noam

  This question already has an answer here: Could globally applying rel=“nofollow” to external links have a negative SEO impact 1 answer I'm currently adding a nofollow to almost all of my outbound links thinking this will keep the PR inside my domain. Is this a bad approach?

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• Object Oriented Design of a Small Java Game

  - by user2733436

  This is the problem i am dealing with. I have to make a simple game of NIM. I am learning java using a book so far i have only coded programs that deal with 2 classes. This program would have about 4 classes i guess including the main class. My problem is i am having a difficult time designing classes how they will interact with each other. I really want to think and use a object oriented approach. So the first thing i did was design the Pile CLASS as it seemed the easiest and made the most sense to me in terms of what methods go in it. Here is what i have got down for the Pile Class so far. package Nim; import java.util.Random; public class Pile { private int initialSize; public Pile(){ } Random rand = new Random(); public void setPile(){ initialSize = (rand.nextInt(100-10)+10); } public void reducePile(int x){ initialSize = initialSize - x; } public int getPile(){ return initialSize; } public boolean hasStick(){ if(initialSize>0){ return true; } else { return false; } } } Now i need help in designing the Player Class. By that i mean i am not asking for anyone to write code for me as that defeats the purpose of learning i was just wondering how would i design the player class and what would go on it. My guess is that the player class would contain method for choosing move for computer and also receiving the move human user makes. Lastly i am guessing in the Game class i am guessing the turns would be handeled. I am really lost right now so i was wondering if someone can help me think through this problem it would be great. Starting with the player class would be appreciated. I know there are some solutions for this problem online but i refuse to look at because i want to develop my own approach to such problems and i am confident if i can get through this problem i can solve other problems. I apologize if this question is a bit poor but in specific i need help in designing the Player class.

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• Store image as logic file (in db by using binary format) or physical file (in the server)

  - by Michel Ayres

  In those study cases of image storage, An image that change only once in a while, if it changes at all (like an image for an article) The image case from above is not only one image but over 10, that link to the same article An image that have changes very often (like a banner image for a website) The image above is huge What is the best approach for each case? What is the "right/faster" way to do this task in each scenario ?

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