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• Web service reference location?

  - by Damien Dennehy

  I have a Visual Studio 2008 solution that's currently consisting of three projects: A DataFactory project for Business Logic/Data Access. A Web project consisting of the actual user interface, pages, controls, etc. A Web.Core project consisting of utility classes, etc. The application requires consuming a web service. Normally I'd add the service reference to the Web project, but I'm not sure if this is best practice or not. The following options are open to me: Add the reference to the Web project. Add the reference to the Web.Core project, and create a wrapper method that Web will call to consume the web service. Add a new project called Web.Services, and copy step 2. This project is expected to increase in size so I'm open to any suggestions.

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• Forms authentication for users and Windows for Database?

  - by scyonx

  On our production servers, the admins created a WebUser active directory account which is users for anonymous access to IIS and is also used to authenticate database access with our SQL Server instances using Integrated Security=SSPI in the connection string and identity impersonate="true" in the web.config. I've often come across situations where I would like to or even need to use forms authentication. However, I using forms authentication, Integrated Security seems to use the logged in user's credentials to authenticate against the database. In these cases I have changed the connection string to use the credentials of a SQL Server users instead. I would prefer to not have a hard coded username and password in the connection string or rather worse in code. Is it possible to use forms authentication just for user authentication for users and windows authentication with the IIS user for database access? What would be the best practice in such a situation?

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• What is the accepted pattern for WPF commanding in MVVM?

  - by Robert S.

  I'm working on a WPF app and I understand the command pattern pretty well, but I've found that there are several different implementations of the command pattern for MVVM. There's Josh Smith's implementation in his WPF sample app, the DelegateCommand from Prism, and the CommandBindings implementation. My question is, what is the generally accepted best practice for using commands with MVVM? My application uses Prism so DelegateCommand is available to us. The devs on my team are arguing about which approach is "best." Some don't like the numerous .cs files generated for each command, others prefer that everything be wired up via CommandBindings. I'm at a loss. Can anyone shed some light?

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• Rails: Helpers and Models - where to organize code

  - by Sam

  More and more I'm putting all of my code in models and helpers concerning MVC. However, sometimes I'm not sure where to organize code. Should it go into the model or should it go into a helper. What are the benefits of each. Is one faster or are they the same. I've heard something about all models getting cached so it seems then like that would be a better place to put most of my code. For example here is a scenario that works in a model or in helper: def status if self.purchased "Purcahsed" elsif self.confirmed "Confirmed" elsif self.reserved "Reserved" else "Pending" end end I don't need to save this status as in the database because there are boolean fields for purchased, and confirmed, and reserved. So why put this in a model or why put it into a helper? So I'm not sure of the best practice or benefits gained on putting code into a model or into helper if it can be in both.

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• Dynamicly Inject img alt attribute jQuery

  - by Brock

  I need some help, and before we get going, I know it is probably not best practice, but I am doing some maintenance to an existing site and need to accomplish the following for a fix. <a rel="lightbox" href="site.com" title="a generated title"><img src="site.com/img" class="post-image" alt="a long description"/></a> Okay, so I am trying to figure out how to use jQuery or any other method to take the "alt" attribute from my image, and dynamically overwrite the "title" attribute of my "a" tag. Any help would be awesome, I am kinda lost at this juncture.

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• count of distinct acyclic paths from A[a,b] to A[c,d]?

  - by Sorush Rabiee

  I'm writing a sokoban solver for fun and practice, it uses a simple algorithm (something like BFS with a bit of difference). now i want to estimate its running time ( O and omega). but need to know how to calculate count of acyclic paths from a vertex to another in a network. actually I want an expression that calculates count of valid paths, between two vertices of a m*n matrix of vertices. a valid path: visits each vertex 0 or one times. have no circuits for example this is a valid path: but this is not: What is needed is a method to find count of all acyclic paths between the two vertices a and b. comments on solving methods and tricks are welcomed.

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• Multi-Threading - Cleanup strategy at program end

  - by weismat

  What is the best way to finish a multi-threaded application in a clean way? I am starting several socket connections from the main thread in seperate sockets and wait until the end of my business day in the main thread and use currently System.Environment.Exit(0) to terminate it. This leads to an unhandled execption in one of the childs. Should I stop the threads from the list? I have been reluctant to implement any real stopping in the childs yet, thus I am wondering about the best practice. The sockets are all wrapped nicely with proper destructors for logging out and closing, but it still leads to errors.

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• Maven2: Best practise for Enterprise Project (EAR file)

  - by Maik

  Hello everyone, I am just switching from Ant to Maven and am trying to figure out the best practice to set up a EAR file based Enterprise project? Lets say I want to create a pretty standard project with a jar file for the EJBs, a WAR file for the Web tier and the encapsulating EAR file, with the corresponding deployment descriptors. How would I go about it? Create the project with archetypeArtifactId=maven-archetype-webapp liek a war file and extend from there? What is the best project structure (and POM file example) for this? Where do you stick the ear file related deployment descriptors, etc? Thanks for any help.

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• how to manage vim plugin

  - by Haiyuan Zhang

  I want to know how do you manage your vim plugins. As it is, One of the biggest fun of using is that one can easily try many interesing new plugins, just download it and unzip it in under ~/.vim. But if you try too often and try too much, you might get trouble as confilct of key mapping , in compatitble script version, dpendency between different plugin ..... Then you want to remove some plugin ,kind of like rollback your vim to a sound condition. But, the rollback could be very painful . cus for some "giant" plugin, like perl-support ( it's great plugin, anyway), will consist of many vim scripts which spread in different dirctories. To remove single one giant plugin will be anoying, not too mention if you remvoe many plugin at one time. In a word , I'm looking for good practice for managing vim plugins.

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• CodeIgniter based e-shop, shipping and gift address design problem

  - by alexander

  While building an ecommerce platform I have run into design problems. I'm working with the built-in CodeIgniter's cart class. It stores all the cart information in session. Let say that cart has already been filled with products and user clicks checkout. When should I store order in database? Just after that click or after several steps of gathering information and stoing it in session? How to deal with additional features like different shipping methods? Should I add it to the basket first and get additional (gift address) to session? I dont want to store it in database because of the relation between gift address and order is needed and since I dont know what's the ID of the order. I'm puzzled :) Additionally I think its crucial to keep cart aware of shipping methods and additional bought services (by selecting gift address there is an extra fee) because the cart content is just like an reciept? In brief, what is the best practice to process checkout?

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• Correct sequence of actions when using Markdown & MySQL?

  - by Andrew Heath

  I want my users to be able to write an article in Markdown, have it stored in the MySQL database (with the option to edit it in the future), and displayed for other users. In practice, this is my understanding of how it works: INPUT user input via HTML form using Markdown syntax $queryInput = mysql_real_escape_string($userInput); insert sanitized string into database OUTPUT query field from database $output = Markdown($queryResult); display $output Is that it? Does PHP Markdown preclude the need for htmlspecialchars or Pure HTML ? Thanks!

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• Returning several COUNT results from one ASP SQL statement

  - by user89691

  Say I have a table like this: Field1 Field2 Field3 Field4 fred tom fred harry tom tom dick harry harry and I want to determine what proportion of it has been completed for each field. I can execute: SELECT COUNT (Field1) WHERE (Field1 <> '') AS Field1Count SELECT COUNT (Field2) WHERE (Field2 <> '') AS Field2Count SELECT COUNT (Field3) WHERE (Field3 <> '') AS Field3Count SELECT COUNT (Field4) WHERE (Field4 <> '') AS Field4Count Is it possible to roll up these separate SQL statements into one that will return the 4 results in one hit? Is there any performance advantage to doing so (given that the number of columns and rows may be quite large in practice)?

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• Automatically deleting pyc files when corresponding py is moved (Mercurial)

  - by Oddthinking

  (I foresaw this problem might happen 3 months ago, and was told to be diligent to avoid it. Yesterday, I was bitten by it, hard, and now that it has cost me real money, I am keen to fix it.) If I move one of my Python source files into another directory, I need to remember to tell Mercurial that it moved (hg move). When I deploy the new software to my server with Mercurial, it carefully deletes the old Python file and creates it in the new directory. However, Mercurial is unaware of the pyc file in the same directory, and leaves it behind. The old pyc is used preferentially over new python file by other modules in the same directory. What ensues is NOT hilarity. How can I persuade Mercurial to automatically delete my old pyc file when I move the python file? Is there another better practice? Trying to remember to delete the pyc file from all the Mercurial repositories isn't working.

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• Is unit testing the definition of an interface necessary?

  - by HackedByChinese

  I have occasionally heard or read about people asserting their interfaces in a unit test. I don't mean mocking an interface for use in another type's test, but specifically creating a test to accompany the interface. Consider this ultra-lame and off-the-cuff example: public interface IDoSomething { string DoSomething(); } and the test: [TestFixture] public class IDoSomethingTests { [Test] public void DoSomething_Should_Return_Value() { var mock = new Mock<IDoSomething>(); var actualValue = mock.Expect(m => m.DoSomething()).Returns("value"); mock.Object.DoSomething(); mock.Verify(m => DoSomething()); Assert.AreEqual("value", actualValue); } } I suppose the idea is to use the test to drive the design of the interface and also to provide guidance for implementors on what's expected so they can draw good tests of their own. Is this a common (recommended) practice?

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• Java webapp: where/how to automatically set each picture's width/height

  - by NoozNooz42

  For several reasons, a lot of "webmaster guides" (like Google and Yahoo!'s webmaster guides/guidelines) repeats several times that it is better to always put the width and height attribute of the img tag. One of the most obvious reason is that the elements in the page won't seem to be "jumping around" to a new location after every picture is loaded (always setting the correct width/height sure gets rid of this behavior). And there are other reasons to follow these guidelines / best practices. So: if we consider that these are indeed good practices if there are a lot of pictures and they are changing often if pictures aren't changing between two .war re-deploy (that is: there's no user-contributed picture) if we don't want to manually edit all these width/height attributes How do we automatically/programmatically serve HTML pages where every img tag have their width/height attribute correctly set as the best practice recommend?

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• Ruby character encoding problems in netbeans and command wíndow

  - by salgo60

  I use netbeans as development IDE and runs the application from cmd but have problems to display ISO 8859-1 characters like åäö correct in both cmd window and when I run the application from netbeans Question: What is best practice to set it up Right now I do @output.puts indent + "V" + 132.chr + "lkommen till Ruby Camping!" to get ä My environment chcp 65001 Active code page: 65001 ruby main.rb Source encoding: <Encoding:US-ASCII> Default external: #<Encoding:UTF-8> Default internal: nil Locale charmap: "CP65001" where I have in the code def self.printEncoding puts "Source encoding: #{__ENCODING__.inspect}" if defined? __ENCODING__ if defined? Environment::Encoding puts "Default external: #{Encoding.default_external.inspect}" puts "Default internal: #{Encoding.default_internal.inspect}" puts "Locale charmap: #{ Encoding.locale_charmap.inspect}" end puts "LANG environment variable: #{ENV['LANG'].inspect}" unless ENV['LANG'].nil? end ruby -v ruby 1.9.1p378 (2010-01-10 revision 26273) [i386-mingw32]

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• iPhone+Quartz+OpenGL. What is the correct way for Quartz and OpenGL to play nice together regarding

  - by dugla

  So we know the CoreGraphics/Quartz imaging model is based on pre-multiplied alpha. We also know that OpenGL blending is based on un-premultiplied alpha. What is the best practice to avoid head explosion when doing blending with textures that are derived from pre-multiplied alpha imagery (PNG files generated in Photoshop with pre-multiplied alpha). Given the apples/oranges mish mash of Quartz and OpenGL, what is the correct glBlendFunc for doing the fundamental Porter/Duff "over" operation? Typical example: A simple paint program. Brush shapes are texture-map patterns created from pre-multiplied alpha rgba images. Paint color is specified via glColor4(...) with the alpha channel used to control paint transparency. GL_MODULATE is used so the brush texture multiplies the (translucent) paint color to blend the color into the canvas. Problem: The texture is premult. The color is not. What is the correct way to handle this fundamental inconsistency? Thanks, Doug

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• best analogy to explain free software floss to non geeks

  - by opensas

  How do you explain free libre open source software to a computer illiterate guy? Two well known analogies I've often heard are: free software as a meal recipe, a set of instructions for you to inspect, learn, put into practice, and improve... versus a canned meal that you can only swallow without even knowing what you're eating... and the other is comparing privative software to a car that you aren't allowed to open it's trunk to see inside in case anything goes wrong... I'd like to know what other analogies you know that might help us explain free software to non geeks saludos sas

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• REST: Should I redirect to the version URL of an entity?

  - by sfussenegger

  I am currently working on a REST service. This service has an entity which has different versions, similar to Wikipedia articles. Now I'm wondering what I should return if for GET /article/4711 Should I use a (temporary) redirect to the current version, e.g. GET /article/4711/version/7 Or should I return the current version directly? Using redirects would considerably simplify HTTP caching (using Last-Modified) but has the disadvantages a redirect has (extra request, 'harder' to implement). Therefore I'm not sure whether this is good practice though. Any suggestions, advise, or experiences to share? (btw: ever tried search for "REST Version"? Everything you get is about the version of the API rather than entities. So please bear with me if this is a duplicate.)

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• Store data for songs MySQL DB

  - by Johan

  I'm storing a huge set of songs in a MySQL database. This is what I store in the 'songs' table: CREATE TABLE `songs` ( `song_id` int(10) unsigned NOT NULL auto_increment, `song_artist` varchar(255) NOT NULL, `song_track` varchar(255) NOT NULL, `song_mix` varchar(255) NOT NULL, `song_title` text NOT NULL, `song_hash` varchar(40) NOT NULL, `song_addtime` int(10) unsigned NOT NULL, `song_source` text NOT NULL, `song_file` varchar(255) NOT NULL, PRIMARY KEY (`song_id`) ) ENGINE=MyISAM AUTO_INCREMENT=1857 DEFAULT CHARSET=latin1 Now I'd like to keep track of how many plays each song has, and other song-specific data that relates to the song. I don't want to keep adding fields to the 'songs' table for this. How can I store song related data a more efficient way? What's the best practice here?

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• Why do C compilers prepend underscores to external names?

  - by Michael Burr

  I've been working in C for so long that the fact that compilers typically add an underscore to the start of an extern is just understood... However, another SO question today got me wondering about the real reason why the underscore is added. A wikipedia article claims that a reason is: It was common practice for C compilers to prepend a leading underscore to all external scope program identifiers to avert clashes with contributions from runtime language support I think there's at least a kernel of truth to this, but also it seems to no really answer the question, since if the underscore is added to all externs it won't help much with preventing clashes. Does anyone have good information on the rationale for the leading underscore? Is the added underscore part of the reason that the Unix creat() system call doesn't end with an 'e'? I've heard that early linkers on some platforms had a limit of 6 characters for names. If that's the case, then prepending an underscore to external names would seem to be a downright crazy idea (now I only have 5 characters to play with...).

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• RESTFul, statelesness and sessions

  - by Per Arneng

  RESTFul service has a rule that it should be stateless. By beeing that it does not allow a session to be created and maintained by sending a session key between the client and the server and then holding a session state on the server. If i look at the definition in wikipedia of stateless server http://en.wikipedia.org/wiki/Stateless_server "A stateless server is a server that treats each request as an independent transaction that is unrelated to any previous request" It states that it should be unrelated to any previous request. In practice this means that any type of authentication will be comparing the credentials of a user to a state on the server that was created by a previous operation. So a service called login is related to and dependent on the state that has been created by previous requests (ex: create_user and/or change_password). In my view you are breaking statelessnes by doing authentication. My point is that people are complaining about having sessions in RESTFul is breaking statelesness but doing authentication is also breaking the same rule. What do you think?

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• Career path decisions

  - by MindFold

  Hi all, I'm on a verge of quitting my current job as a .NET programmer. i'm 25 years old and have been a .NET programmer in the past 5-6 years, but now i wonder if maybe i should take this opurtunity and try some other things, like RT\Embedded or Driver development. My pro\cons: i love .NET since you can write enterprise systems with it, learn cool development methodologies and practice many patterns i want to learn RT\Embedded\Driver since its at the heart of so many things and i'm feeling this is a black hole for me. My question are: Is making career leaps a good idea? How can i manage to get myself into a job in RT\Embedded as my whole Resume has c# written all over it. What should i bet my cards on this days? android? java? flash? silverlight? etc?

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• How to setup testing LAMP environment to work with outsourcing companies?

  - by Kelvin

  Hello Guys, I need to setup testing LAMP environment in my office to work with outsourcing companies. This is what I think should be done on my side: Setup testing web server with the same configuration as on production Setup testing SQL server with "fake data"? Outsourcers should have access only to some part of original code Outsourcers should use CVS to update their code Once testing is finished someone releases the update ............ How would you separate original code and database from testing environment, but keep it as close as possible to production? What is the general practice for setting up testing environment and how other companies deal with outsourcers? I will appreciate for any of your thoughts and ideas from your personal experience. Maybe someone can suggest some article on this topic. Thank you a lot!

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• Best design for generating code from an AST?

  - by Sam Washburn

  I'm working on a pretty complex DSL that I want to compile down into a few high level languages. The whole process has been a learning experience. The compiler is written in java. I was wondering if anyone knew a best practice for the design of the code generator portion. I currently have everything parsed into an abstract syntax tree. I was thinking of using a template system, but I haven't researched that direction too far yet as I would like to hear some wisdom first from stack overflow. Thanks!

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