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• Abstract factory pattern on top of IoC?

  - by Sergei

  I have decided to use IoC principles on a bigger project. However, i would like to get something straight that's been bothering me for a long time. The conclusion that i have come up with is that an IoC container is an architectural pattern, not a design pattern. In other words, no class should be aware of its presence and the container itself should be used at the application layer to stitch up all components. Essentially, it becomes an option, on top of a well designed object-oriented model. Having said that, how is it possible to access resolved types without sprinkling IoC containers all over the place (regardless of whether they are abstracted or not)? The only option i see here is to utilize abstract factories which use an IoC container to resolve concrete types. This should be easy enough to swap out for a set of standard factories. Is this a good approach? Has anyone on here used it and how well did it work for you? Is there anything else available? Thanks!

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• real time scenario between interface/abstract class ?

  - by JavaUser

  Hi , Please give me a real time simple example for the below questions : Where to use interface rather abstract class Where to use abstract class rather interface I need code snippet for both . Which takes low memory and which performs well . Do I need to consider the design aspect also? What is the conceptual difference not the syntactical difference .

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• make scrollbars look the same in every OS?

  - by Haroldo

  Scrollbars get quite a bit of use in the site i'm working on and how they look on some OS's really doesn't fit with the design - especially if someone's running xp! looking for a lightweight css / jquery method of custom styling my scrollbars?

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• What script is vBulletin using for their manual?

  - by Chris

  http://www.vbulletin.com/docs/html/ Are they using a custom design or is that a script? If it's custom, is there something similar to it that I could use to document my software?

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• Scrollbar skininng problem

  - by simplemagik

  I'm skinning scrollbar in my flex app and got one problem. This white square between scrollbars(view the image) ruibs all my design and i need to disable it, make it invisible, change it background color, alpha or smth like this. I can paste some code here but i think there is no need in it. Working in Flex 3. any ideas? image

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• certification Test engine

  - by harigm

  HI, I am trying to build an certification Test engine in my website techification.com Can any one please help me, what are the things That i need to consider before I start design and implementation. This application will be for all the users who are willing to take Sun certification or any certifications and they can come to techification.com and take the online exam and get evaluated before they take the actual Exam.

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• How to prevent arbitrary code execution vulnerability in our programs?

  - by Calmarius

  You always read in changelogs when your system or browser or any program updates that they fixed a bug that made possible that an attacker can execute any code in your computer with a forged website, or attacking your computer with carefully forged packets, etc... Because you read it so often that means any program can have similar vulnerabilites... What causes this? how to design our programs to prevent similar issues?

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• Questions about Wordpress 3.0 RC

  - by Nimbuz

  I'm looking to upgrade my blog from Wordpress 2.5 to 3.0 RC, but I'm not sure if: It is stable? It will support existing v2.5 plugins? It will support my custom themes? Or do I have to design them from scratch for 3.0? Many thanks for your help!

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• Tagging in Subversion - how do I make the decision about continuing to work on my trunk vs. the new

  - by Howiecamp

  I'm running Tortoise SVN to manage a project. Obviously the principles around tagging apply to any implementation of SVN but in this question I'll be referring to some TortoiseSVN-specific dialog boxes and messages. My working directory and the subversion repository structure both have a Source root directory and the Trunk, Tags and Branches directories underneath. (I couldn't figure out how to do a multilevel indented hierarchy in markdown without using bullets, so if someone could edit and fix this I'd appreciate it.) I'm working out of the Trunk directory in my working copy and it's pointing at the Trunk directory in the repo. I want to apply a Tag "Release1" so I click the "Branch/tag..." menu option and set the repo path as my [repo_path/bla/Source/Tags/Release1" tag. This dialog box gives me the option to "Switch my working copy to new branch/tag". I understand that if this option is left unchecked, the new "Release1" branch under /Tags" will be created but my working copy will remain on the previous "Trunk" path. If I do check this option (or use the Switch command) I understand that my working copy will switch to the new "Release1" branch under "/Tags". Where I'm missing a concept is how to make this decision. It doesn't seem like I want to switch my working directory to the recently created tag since by definition (?) I want that tag to be a snapshot of my code as of a point in time. If I don't switch the working directory, I'll continue working off Trunk and when I'm ready to take another snapshot I'll make another tag. And so on... Am I understanding this right or am I stating something incorrectly in the previous paragraph (e.g. the statement about not wanting to switch to the tag since the tag should represent a point in time snapshot) or otherwise missing something regarding how to make this decision?

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• Disposing the members that implement IDisposable.

  - by Amby

  In my Dispose methods (like the one below), everytime i want to call someObj.Dispose() i also have a check for someObj!=null. Is that because of bad design on my part? Is their a cleaner way to ascertain that Dispose of all the members (implementing IDisposable) being used in an object is called without having a risk of NullReference exception ? protected void Dispose(bool disposing) { if (disposing) { if (_splitTradePopupManager != null) { _splitTradePopupManager.Dispose(); } } } Thanks for your interest.

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• PHP: Object Oriented Programming -> Operator

  - by oman9589

  So I've been reading through the book PHP Solutions, Dynamic Web Design Made Easy by David Powers. I read through the short section on Object Oriented PHP, and I am having a hard time grasping the idea of the - operator. Can anyone try to give me a solid explanation on the - operator in OOP PHP? Example: $westcost = new DateTimeZone('America/Los_Angeles'); $now->setTimezone($westcoast); Also,a more general example: $someObject->propertyName Thanks

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• XCode CoreData files not found/opening

  - by jAmi

  Hello, I am using the Xcode 3.1.4 that means SDK 3.1.2 The problem is that I cannot open .xcdatamodel (Core Data) file and I don't even get the Data Model option in Design Menu bar. When ever I double click and try to open the file, XCode gives me an error saying that it cannot find the file at (my project's path).Perhaps it was moved or deleted? , but the file exists at the same path. Please help me out as I haven't upgraded my system to Snow Leopard so cant use SDK 3.2 Regards jAmi

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• What is the best way to create a wizard in C# for web?

  - by Yan

  Hi , i want to create a wizard the include a few steps ,that in the final steps we need to include all the steps and save on the data base. what is the best design to do this ? there is implemante for a jquery ? i need to save the steps in sessions till the final save ? thanks !!!!

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• jQuery to store data for sessions

  - by Ted

  I am trying to use jQuery AJAX. What my requirement is, i wish to load user names from DB in dataset, convert it to JSON format and store it in memory or using jQuery data for use while a user is browsing my site, i.e for a session. This way I can use autocomplete or my own code to display data to user. Can anyone help me design such a scenario?

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• Multilevel asynchronous method call pattern in c#

  - by michajas

  Hi, I have design problem regarding async calls to method. I'd like to know best/good pattern to call async method, which calls another async method, which calls another async method :) In other words, I have WCF service reference created with async methods and I want to call them from another async method which is called by other async method. All this for non blocking GUI. Thanks!

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• Implementing a hilbert map of the internet

  - by Martin

  In the XKCD comic 195 a design for a map of the internet address space is suggested using a hilbert curve so that items from a similar IPs will be clustered together. Given an IP address, how would I calculate the 2D coordinates (in the range zero to one) that this IP is located on such a map?

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• On what platform did these popular programming languages originate?

  - by speciousfool

  Perhaps you know the story of HTTP and HTML being developed on a NeXT computer. I am curious which platform served as the first home for these programming languages: Ada C C++ C# D Erlang Fortran Haskell Java Javascript Lisp Logo MATLAB ML Perl PHP Prolog Python R Ruby Scheme SQL Smalltalk I thought it might be interesting to reflect on how the machine and operating environment lead to different design decisions. Or to see if some architecture or operating system variant was particularly fruitful for programming language development. A question for the historians among us.

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• Image compatibility in iphone and android

  - by damodar

  I developed UI for iphone apps and now want to use the same UI in Android apps. I read that Android use dip for image resolution and i also read that 1 dip=1.5 pixel.I simply multiply the image size by 1.5px. Now the problem is that the image is blur and not as clear as in iphone apps.So will some body suggest me how should i make a design so that it could be used in iphone and android.

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• Sparse checkouts and svn:externals

  - by JesperE

  I'm trying to do a sparse checkout of a folder containing externals, but none of the externals are being checked out. This issue seems to indicate that this behavior may be by design, or at least that it isn't clear what the behavior should be. From my point of view, the obvious behavior is that externals are treated just as any other directory, and checked out following the same sparse checkout rules. Is there a way to work around this except manually checking out the externals?

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• boolean expressions, why just two terms?

  - by Ed Guiness

  Given that it's valid to write a = b = c = 2; It would also be nice, rather than bool allTwo = a == 2 && b == 2 && c == 2; to instead write bool allTwo = a == b == c == 2; But I can't. Is there a language-design reason for this?

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• Does UserId data type affect FormsAuthentication.SetAuthCookie(UserId.ToString(), false)?

  - by FreshCode

  Does the original data type of the username string in a call to FormsAuthentication.SetAuthCookie(...) make any difference with regards to security or code maintainability? As I understand it, the cookie is encrypted and used to identify a user on each request. I'm curious whether it should affect the design of the primary key on my Users table in my database, eg. Guid vs int or a unique username string.

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• Designing the iPhone interface in a nib or in code?

  - by Jacob Relkin

  I've been pondering over this question for a long time already. On the one hand, Interface Builder offers a really easy way to design the interface and wire the elements up with objects in code. On the other hand, in larger projects, Interface Builder becomes a hassle to maintain. Any suggestions would be greatly appreciated.

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• SWT: cleaning up before application exit

  - by Alexey Romanov

  What is the best way for an SWT application to clean up resources before application exit? I see two options: 1) Add a DisposeListener to main window (or better, to the Display). Will it get run if an uncaught exception happens? 2) Use a shutdown hook. Any problems to be aware of there which aren't mentioned in Design of the Shutdown Hooks API?

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• How to implement session like stackoverflow?

  - by stacker

  I'm implementing this kink of login: http://jaspan.com/improved_persistent_login_cookie_best_practice In this design a new token issued to the user each new login. So it tells me that I need to Now I need to implement a session, for this login. I'd like to implement session like stackoverflow, so people will can have session without login. but for a login there will be always a session. Any ideas how?

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• drupal (CMS) or codeigniter (MVC) for creating a new web application?

  - by ajsie

  im going to create a new web application that is very customized. it will contain images, that are fully searchable - in a very, very customized way. when you click on the pictures you can add comments and so on. it requires users to be registered, but the registration/login process will be highly customized too. at the moment im using CodeIgniter for this. But i've read a lot of posts about CMS like Drupal and it sounds like i could let it handle basic stuff, maybe design and other front end work. i have no experience with CMS, in fact, i just started to use a MVC framework like CI and was impressed of how much easier it gets to start developing. so i wonder, if i'm going to create this kind of application, could i use drupal and then add the usual stuff, as i was going to do with CodeIgniter, like controllers, views, models, config files, my own libraries and so on? how does it work on a system like Drupal. how do you code PHP with it as with any MVC framework. it sounds like it has a lot of modules, i just wonder, if i can use it as a MVC framework but have the benefit of having all these basic stuff and design ready to use? cause then it sounds like the best "library" to provide for a web application from scratch. or is it difficult to create a customized app with it? i guess it has modules like images and users, but then how could i customize these so that every image has tags on it and country information, or have every user subscribing to changes to an image, that email will be sent to users and so on? cause i guess its easy to install a module. the question is, how do i customize it. maybe i don't need all that table columns. maybe i want to add/remove business logic. what are the pros and cons with using Drupal for this? is it even the right way to go? can you make a Stackoverflow with Drupal? Facebook? Twitter? Youtube? assuming that you know php of course. share your thoughts cause im totally new on creating a web application! thanks

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