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• Value vs Entity objects (Domain Driven Design)

  - by StackUnderflow

  I have just started reading DDD. I am unable to completely grasp the concept of Entity vs Value objects.. Can someone please explain the problems (maintainability, performance.. etc) a system could face when a Value object is designed as a Entity object. Example would be great... Thanks

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• When in Debug mode in Java, is there anything like a Console where I can type commands?

  - by devoured elysium

  Is it possible in Eclipse to have a Console, where when in Debug mode I can try out things? Like in python, where I can type at any moment for example 1+1 or myVariable.toString(), etc? C# has a similar concept with the F# shell. I'd like to inspect my variables at run-time and try out some methods, having that kind of console would be of great help. Thanks

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• char pointers & integer pointers (++)

  - by benjamin button

  i have two pointers, char *str1; int *str2; if i look at the size of both the pointers lets assume str1=4 bytes str2=4 bytes str1++ will increment by 1 byte but if str2++ will increment 4 byte could anybody tell e the concept behind this?

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• TDD a controller with ASP.NET MVC 2, NUnit and Rhino Mocks

  - by Nissan Fan

  What would a simple unit test look like to confirm that a certain controller exists if I am using Rhino Mocks, NUnit and ASP.NET MVC 2? I'm trying to wrap my head around the concept of TDD, but I can't see to figure out how a simple test like "Controller XYZ Exists" would look. In addition, what would the unit test look like to test an Action Result off a view?

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• Best Role-Based Access Control (RBAC) database model

  - by jhs

  What is the best database schema to track role-based access controls for a web application? I am using Rails, but the RBAC plugin linked by Google looks unmaintained (only 300 commits to SVN; latest was almost a year ago). The concept is simple enough to implement from scratch, yet complex and important enough that it's worth getting right. So how do others architect and implement their RBAC model?

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• python3: removing several chars from a string with a long chain of .replace().replace().replace()

  - by MadSc13ntist

  I found this example on stack overflow. I understand it, but seems like a bit much for such a simple method concept... removing several chars from a string. import string exclude = set(string.punctuation) s = ''.join(ch for ch in s if ch not in exclude) is there a builtin string method in python 3.1 to do something to the tune of: s = "a,b,c,d,e,f,g,h,i" s = s.strip([",", "d", "h"]) instead of: s = s.replace(",", "").replace("d", "").replace("h", "")

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• Vaadin - GWT error "module xxx may need to be recompiled

  - by John Leonard

  I'm ramping up on Vaadin and I'm getting this javascript alert whenever I try and run the demo apps. GWT module 'com.vaadin.terminal.gwt.DefaultWidgetSet' may need to be recompiled I've tried cleaning the project to no avail. As I said, I'm ramping up so I'm sure there's some simple step I'm missing or a concept I haven't grasped.

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• What is the difference between RDF and OWL?

  - by vicky21

  I am trying to grasp the concept of Semantic Web. I am finding it hard to understand what exactly is the difference between RDF and OWL. Is OWL an extension of RDF or these two are totally different technologies?

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• PHP: Script for generating Crossword game?

  - by Prashant

  I need an script for generating crossword game. I have a list of 8 words for which I wnat to generate a crossword game, let's say for 15 column and 15 row. I am not getting the concept of this problem. How to generate this using PHP ?? Can anyone tell me how to do that ??

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• What is validating a binary search tree?

  - by dotnetdev

  I read on here of an exercise in interviews known as validating a binary search tree. How exactly does this work? What would one be looking for in validating a binary search tree? I have written a basic search tree, but never heard of this concept. Thanks

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• How Dispatcher differs from the background thread ?

  - by Ashish Ashu

  How Dispatcher concept in .NET 3.5 in WPF differs from the background thread in .NET 2.0 ? For example what will be difference between statements below: delegate.Invoke/BeginInvoke AND this.dispatcher.Invoke/BeginInvoke

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• Push Notification (duplicate?)

  - by Moshe

  I've seen other questions here about PNS, in terms of code, but how does the concept work?do I need to tell my client that they need a server? What goes in the server in terms of configuration/cron or whatever? Please explain the process. Thanks a ton. EDIT: Please explain: Do I need to purchase an SSL certificate, or does Apple issue a "client" or " app" SSL certificate for me?

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• Secure, simple php faq creating/editing scripts?

  - by Tchalvak

  I'm looking to build a simple site centered around a simple faq system in php. The faq concept is simple, but I want to have an administrative-access backend for editing and creating the entries, and securing a login seems more complex and time-consuming, so I'm looking for suggestions for code to start me off. Does anyone know of any open source php scripts or snippets that would work for administrative login to some php scripts that could be used as a simple faq system? Or both, the faq php code + web administrative access code?

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• What are all the instances of syntactic sugar in Scala?

  - by Jackson Davis

  I decided to create this question to have a single source for all things syntactic sugar in Scala. I feel these details are some of the things most frustrating to starting users and are hard to search for since most/all of them are purely symbols and are thus hard to search for without knowing the name of the concept. TODO: implicit conversions _ syntax for anonymous functions Extractors(Unapply/UnapplySeq) Other things I'm forgetting

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• php- javascript

  - by arafat

  i got a sales web site each time i press "sales" button it it will open a new frame. there is a possibility for more then one frame at the same time. my problem is i want to close the frame after i click enter and home page to be updated provided all the other pending sales frames are remain open.... i tried to do so with window concept also no use so any body can geve a solution regards

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• How to implement 3D model interaction like 3D max or other game editors?

  - by Rushi

  I am developing game editor.To detect mouse hit on 3D model I am using mouse picking concept. But I want to give interactive arrows functionality like other game editor with actual arrows at the center of model in three direction. How to achieve this..?

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• Tic-Tac-Toe AI: How to Make the Tree?

  - by cam

  I'm having a huge block trying to understand "trees" while making a Tic-Tac-Toe bot. I understand the concept, but I can't figure out to implement them. Can someone show me an example of how a tree should be generated for such a case? Or a good tutorial on generating trees? I guess the hard part is generating partial trees. I know how to implement generating a whole tree, but not parts of it.

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• Transient collections for Scala?

  - by Alexey Romanov

  Clojure has a very nice concept of transient collections. Is there a library providing those for Scala (or F#)?

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• Query two different Servers

  - by Felipe Fiali

  I have to query two different servers from a dynamically built query. It basically gets data from one server, treats it, and inserts it into another server. The only problem is I have to be sure it works for both situations: If both the source and destination databases are on the same server, and if they're not. I understand the concept of using Linked Servers in SQL Server, but I cannot think of a way to consider both alternatives, same server and different servers. A little help?

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• Implode a Object List in .NET 2

  - by serhio

  I have(.NET2) an List<Object> objects. I want to "implode" (PHP concept) this array to CSV(obj1;obj2;obj3...) What is the most efficient way? StringBuilder, string.Join? NB. Each object implements a specific override of ToString()

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• Go back to main window once secondView is loaded

  - by Ruthy

  Hi, I have a Tableview on AppDelegate That calls a SecondView (dvController) when DidSelectRowAtIndexPath using: [self.window addSubview:[dvController view]]; On SecondView I defined a button linked to IBAction that should go back to previous view. It works great but when row selected but, How could then go back to previous view if main one is AppDelegate? self.window addSubview:[?? view]]; Should be basic concept but I am quite new and unable to get the solution. Thanx :)

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• Custom Map using iPhone MapKit

  - by DHamrick

  I am attempting to use MapKit to create a custom map (similar to this concept http://mapwow.com/) using an image instead of the google maps image. This is so we can include the gps functionality and the pins functionality. I have looked in the documentation and there does not appear to be a standard way of doing it. Is there a way to do this using MapKit or has someone found a way to achieve something similar?

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• synchronize sql cennection in multithreading in c#

  - by Lalit Dhake

  I am using multi threading concept to run some process. this process uses the sql connection object to get the data from database.This object is in another class. how to synchronize the sql connection while using multithreading?

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• ASP.NET MVC, How to get the page content before render

  - by user361993

  In ASP.NET MVC, how to get the page content before render, we know in Web form app, we can override the method protected override void Render(HtmlTextWriter writer) to get the page content before render. but in MVC there are no event concept, so how we can get the page content. the purpose for that is to emphasize(wrap <strong> tag) the keywords before the page rendered. I'd appreciate for any advice. Thank you.

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• data format encoding and etc

  - by hguser

  Hi: I Suddenly found that I have no idea about the concept of data format and the encoding. For exmpale, what is the differences about the ascii/binary/base64/text-xml ? For a real case, I am working with a web service whose parameter I have to define,however one of the parameter should be ascii,another is binary and the last is netcdf. So,how to define it? ALso I wonder the ascii needed parameter can be a .txt or .dat ?

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