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• How can I refactor my code to use fewer singletons?

  - by fish

  I started a component based, networked game (so far only working on the server). I know why singletons can be bad, but I can't think of another way to implement the same thing. So far I have: A GameState singleton (for managing the global state of the game, i.e. pre-game, running, exiting). A World singleton, which is the root entity for my entity graph An EntityFactory A ComponentFactory I'm thinking about adding a "MessageDispatcher" so individual components can subscribe to network messages. The factories do not have state, so I suppose they aren't so bad. However, the others do have global state, which is asking for trouble. How can I refactor my code so it uses fewer singletons?

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• We're taking OData on the Road!

  We have a series of free, day-long events we're doing around the world to show off the beauty and wonder that is the Open Data Protocol. In the morning we'll be showing you OData and in the afternoon we'll help you get your OData services up and running. Come one, come all! New York, NY - May 12, 2010 Chicago, IL - May 14, 2010 Mountain View, CA - May 18, 2010 Shanghai, China - June 1, 2010 Tokyo, Japan - June 3, 2010 Reading, United Kingdom - June 15, 2010 Paris, France - June 17, 2010 Your speakers...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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• Design application to send messages by marking circle on the map where you want to send message

  - by jhamb

  This is question asked to me by an interviewer, in which a map of world is given, and for those country you want to send message, just marked circle on that area, and just send to all the people comes in that area. Question visual link is : Design this application The approach that I told him: Firstly build whole person's data (contacts , place information and all) Then where you mark on the map, just build a cluster of that country using Hadoop and fire the message to all the person's contact comes in that cluster. So help me for better understandings of this problem, and if have another good approach (all back-end ad front-end) , then please tell me or discuss here with me. Thanks in advance.

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• What can I do to make my eService website customers feel it is a luxurious service? [closed]

  - by Farshid

  I'm developing an e-service website that its monetization model is via paid membership. Beside quality service and content, because I'm serving them for a high fee, I want to make them feel like it is a personal, unparalleled kind of service and I want to spend money for creating things that I give them after their registration such as a beautiful physical membership card so that I can use the effect of mouth-words better and beside that let them be proud about the service. I've tried my best to develop the site experience classy and I'm looking for things in real world to send them after their registration (such as membership card and a small paper tutorial). What are your suggestions? Have you seen things like this before that a website sends you some physical things for making you more loyal and/or something like that? Please kindly share your experiences/suggestions.

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• How can I derive force vectors from velocity vectors?

  - by PixelRouter

  I'm making a 2d shooter ala Geometry Wars. I've got my own simple physics at work driving the background grid and all my entities. To move anything in the world I apply a Vector2d force to it. The 'engine' calculates the resulting acceleration and therefore the velocity. I am trying to port some code I found which implements the classic 'Boids' flocking algorithm, but the code I have works by calculating the Boids' velocities directly, so If i use it as is, it bypasses my physics engine. How I can translate the velocity vectors into force vectors that I can apply to the Boids and which will result in the proper velocities via my physics engine.

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• How does a linked library combined with the main executable program file interact with a kernel?

  - by I ask Questions For a Reason

  I was attempting to find an answer to this, and I did to some degree, but definitely not anywhere good enough to form a respectable, sensible and clear answer. If I am using Windows, Mac, Linux, or nearly any modern made OS for desktop IBM-compatible PCs, laptops, even tablets and smartphones, there's virtual memory. Clearly, compiling, at least on Windows I know this, an executable object file, such as a simple C "Hello World" output to a terminal, will be linked with the standard library, and several other Window's system software, dynamic linked libraries, and the like. However, how does linking all of these executables together or resources form a connectable interaction with, say, a device driver or any other stuff on the lower level?

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• How to learn programming from very basic level to advanced level? [closed]

  - by user1022209

  I know many programming languages ,skills and concepts in very basic, such as PHP, Java, Object-oriented technology. Using PHP, I can build a simple website with CRUD, login function. Using Java, I can make an basic swing csv/plain text editor in which user can switch between 2 different views. In term of object-oriented Technology, I clearly understand what encapsulation, inheritance and Polymorphism are I want to know more about programming. Sometimes I "google" some of the topics I am interested at , the more I see on the internet, the more I feel I am a small potato in the world ( indeed I am ). The codings/concepts are difficult to understand. I lacks confidence right now so I am asking this question :( What is the best way to learn programming to advanced level? Just buy a book and read it page to page? Thanks for any helps

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• Choose Your Boss : un nouveau site d'emplois IT qui s'inspire des sites de rencontres, plus de 200 offres qualifiées

  Choose Your Boss : un nouveau site d'emplois IT qui s'inspire des sites de rencontres Plus de deux cent offres qualifiées de postes disponibles Choose Your Boss est un site original. Il s'inspire de Meetic et autres Attractive World pour mettre en relation développeurs et professionnels de l'IT d'une part et recruteurs d'autre part. Créé par Laurent Chollat-Namy, qui bénéficie d'une expérience professionnelle de 15 ans dans l'IT, celui-ci explique : « Nous avons longuement discuté avec des recruteurs et des informaticiens pour identifier leurs besoins et leurs pratiques. Cette réflexion nous a amenés à réinventer la mise en relation candidat / recruteur en nous inspirant des sites de r...

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• Plagued by multithreaded bugs

  - by koncurrency

  On my new team that I manage, the majority of our code is platform, TCP socket, and http networking code. All C++. Most of it originated from other developers that have left the team. The current developers on the team are very smart, but mostly junior in terms of experience. Our biggest problem: multi-threaded concurrency bugs. Most of our class libraries are written to be asynchronous by use of some thread pool classes. Methods on the class libraries often enqueue long running taks onto the thread pool from one thread and then the callback methods of that class get invoked on a different thread. As a result, we have a lot of edge case bugs involving incorrect threading assumptions. This results in subtle bugs that go beyond just having critical sections and locks to guard against concurrency issues. What makes these problems even harder is that the attempts to fix are often incorrect. Some mistakes I've observed the team attempting (or within the legacy code itself) includes something like the following: Common mistake #1 - Fixing concurrency issue by just put a lock around the shared data, but forgetting about what happens when methods don't get called in an expected order. Here's a very simple example: void Foo::OnHttpRequestComplete(statuscode status) { m_pBar->DoSomethingImportant(status); } void Foo::Shutdown() { m_pBar->Cleanup(); delete m_pBar; m_pBar=nullptr; } So now we have a bug in which Shutdown could get called while OnHttpNetworkRequestComplete is occuring on. A tester finds the bug, captures the crash dump, and assigns the bug to a developer. He in turn fixes the bug like this. void Foo::OnHttpRequestComplete(statuscode status) { AutoLock lock(m_cs); m_pBar->DoSomethingImportant(status); } void Foo::Shutdown() { AutoLock lock(m_cs); m_pBar->Cleanup(); delete m_pBar; m_pBar=nullptr; } The above fix looks good until you realize there's an even more subtle edge case. What happens if Shutdown gets called before OnHttpRequestComplete gets called back? The real world examples my team has are even more complex, and the edge cases are even harder to spot during the code review process. Common Mistake #2 - fixing deadlock issues by blindly exiting the lock, wait for the other thread to finish, then re-enter the lock - but without handling the case that the object just got updated by the other thread! Common Mistake #3 - Even though the objects are reference counted, the shutdown sequence "releases" it's pointer. But forgets to wait for the thread that is still running to release it's instance. As such, components are shutdown cleanly, then spurious or late callbacks are invoked on an object in an state not expecting any more calls. There are other edge cases, but the bottom line is this: Multithreaded programming is just plain hard, even for smart people. As I catch these mistakes, I spend time discussing the errors with each developer on developing a more appropriate fix. But I suspect they are often confused on how to solve each issue because of the enormous amount of legacy code that the "right" fix will involve touching. We're going to be shipping soon, and I'm sure the patches we're applying will hold for the upcoming release. Afterwards, we're going to have some time to improve the code base and refactor where needed. We won't have time to just re-write everything. And the majority of the code isn't all that bad. But I'm looking to refactor code such that threading issues can be avoided altogether. One approach I am considering is this. For each significant platform feature, have a dedicated single thread where all events and network callbacks get marshalled onto. Similar to COM apartment threading in Windows with use of a message loop. Long blocking operations could still get dispatched to a work pool thread, but the completion callback is invoked on on the component's thread. Components could possibly even share the same thread. Then all the class libraries running inside the thread can be written under the assumption of a single threaded world. Before I go down that path, I am also very interested if there are other standard techniques or design patterns for dealing with multithreaded issues. And I have to emphasize - something beyond a book that describes the basics of mutexes and semaphores. What do you think? I am also interested in any other approaches to take towards a refactoring process. Including any of the following: Literature or papers on design patterns around threads. Something beyond an introduction to mutexes and semaphores. We don't need massive parallelism either, just ways to design an object model so as to handle asynchronous events from other threads correctly. Ways to diagram the threading of various components, so that it will be easy to study and evolve solutions for. (That is, a UML equivalent for discussing threads across objects and classes) Educating your development team on the issues with multithreaded code. What would you do?

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• bash script ask for root password

  - by VinceBrowning

  I want have a script that I can give to friends which will add repositories and download files, install them without having to use command as they are not command line savey and have no desire to learn. I need to know how to get the script to prompt them for the root password to allow them to do some of these functions. How would I go about this? Please don't hate on them.. Getting them to start using Linux was a big step and I am just happy that they are attempting something new... and it was in the open source world..

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• What makes Java so suitable for writing NoSQL Databases

  - by good_computer

  Looking at this page that aggregates the current NoSQL landscape, one can see that the majority of these projects are written in Java. Databases are complex systems software dealing with the file system, and so C/C++ would be a better choice than Java for this. (that's my thinking which might be flawed) Secondly, databases deal with transferring large amounts of data from disk to RAM -- which they call a working set. The JVM takes non-trivial amount of RAM for it's own purpose -- so it would be more efficient to use a platform that leaves lots of memory for data instead of hogging it for its own operations. The major relational databases are ALL written in C/C++ MySQL C, C++ Oracle Assembler, C, C++ SQL Server C++ PostgreSQL C SQLite C So what makes Java so popular in NoSQL world.

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• 2d engine with WebGL

  - by Philipp

  I am currently developing a HTML5 canvas game with a sprite-based 2d engine. The engine is working well so far, but now I thought that I could maybe add some cool graphic effects when I would re-implement the whole engine with WebGL. The whole graphic engine would stay strictly two-dimensional (think of it as a 3d world where the z coordinate of all vertices is 0.0). What I hope to gain from this is the ability to use pixel shaders to create special effects. I also think that the performance could improve. What do you think about that plan?

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• How to use HTTP Handler to make a client2client communication? [closed]

  - by meorfi

  I'm new to Web programming! I try to make an app (something like Client to Client communication with C# Handlers and jQuery). I.E.: When 1Client make a click on his clientSide(browser), there paints one point, and on the same time the 2Client sees what 1Client did. And, in turn, where 2Client make a click on his browser, there paints one point, and the 1Client also sees what 2Client did. I could done already the configuration of IIS, I made an simple show Hello World and it run OK. And, further, what should i done.... Can you advice me, please, with some exemples, or tutorials, how to do this job. Sorry for my questions which seems to be not studied.

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• Should my game handle collisions in the Player object?

  - by user1264811

  I'm making a 2D platform game. Right now I'm just working on making a very generic Player class. I'm wondering if it would be more efficient/better practice to have an ActionListener within the Player class to detect collisions with Enemy objects (also have an ActionListener) or to handle all the collisions in the main world. Furthermore, I'm thinking ahead about how I will handle collisions with the platforms themselves. I've looked into the double boolean arrays to see which tiles players can go to and which they can't. I don't understand how to use this class and the player class at the same time.

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• The Advancement of Technology That Lead to Websites Being One of the Most Important Business Assets

  Twenty years ago the world was a very different place. Most companies were still using paper based filing systems and people saw computers as being complicated and expensive. Businesses had storage rooms and large filing cabinets full of alphabetically and chronologically ordered documents and letters. Due to the efforts of large corporations, technology has advanced in a way that most people would have never imagined. What would have taken up a full warehouse worth of space can now be stored digitally in a device that is smaller than a book and it can be searched through in a matter of seconds.

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• Help with off-game tasks

  - by peoro

  I love writing video games for fun, and often do that. I noticed, anyway, that most of the times implementing the gameplay itself doesn't take too much time to me (maybe because I already did that plenty times and know what and how to do for most of the things), but when I try to implement off-game stuff I get lost. By off-game I mean what is not gameplay: menus, cutscenes between levels, world map to choose levels, saving and loading status, managing replays ... Only tried to write a few of these a few times, but always failed; that's why I never really completed and distributed a game. Are these common problems? And where should I start to do this? Where could I find some books/guides about such stuff?

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• Choose Your Boss : un nouveau site d'emplois IT qui s'inspire des sites de rencontres, plus de 200 offres qualifiées

  Choose Your Boss : un nouveau site d'emplois IT qui s'inspire des sites de rencontres Plus de deux cent offres qualifiées de postes disponibles Choose Your Boss est un site original. Il s'inspire de Meetic et autres Attractive World pour mettre en relation développeurs et professionnels de l'IT d'une part et les recruteurs d'autre part. Créé par Laurent Chollat-Namy, qui bénéficie d'une expérience professionnelle de 15 ans dans l'IT, celui-ci explique : « Nous avons longuement discuté avec des recruteurs et des informaticiens pour identifier leurs besoins et leurs pratiques. Cette réflexion nous a amenés à réinventer la mise en relation candidat / recruteur en nous inspirant des sites ...

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• How realistic is it to find remote jobs? [on hold]

  - by user3728220

  I just started teaching myself Python and so far I'm really enjoying it. One of my goals in life is to find a job that I can do remotely from anywhere in the world (that has reliable internet). I know that for some programming career paths this would be impossible to do, so I'm looking for comments or advice about the best way to achieve this. Whether there's certain types of companies or industries to look for, any particular languages that would be best-suited for this, anything else I should know, etc. Thanks!

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• is it valid that a state machine can have more than one possible state for some transition?

  - by shankbond

  I have a requirement for a workflow which I am trying to model as a state machine, I see that there is more than one outcome of a given transition(or activity). Is it valid for a state machine to have more than one possible states, but only one state will be true at a given time? Note: This is my first attempt to model a state machine. Eg. might be: s1-t1-s2 s1-t1-s3 s1-t1-s4 where s1, s2, s3, s4 are states and t1 is transition/activity. A fictitious real world example might be: For a human, there can be two states: hungry, not hungry A basket can have only one item from: apple, orange. So, to model it we will have: hungry-pick from basket-apple found hungry-pick from basket-orange found apple found-eat-not hungry orange found-take juice out of it and then drink- not hungry

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• Diminishing Returns - When is it Time to Take Your Website Live?

  Being a perfectionist is not always the best way to be. Especially in a world where being first to market isn't the worst thing ever. Like many things in life, deciding when to take your new website live is a fine balancing act. The sooner you can start building up a readership or client base, the better; but you risk serious damage to your site's reputation if its functional and technical performance is below par. So when is the right time?

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• 3 Steps to Establishing an Internet Presence

  In today's World Wide Web, establishing an Internet presence could mean a number of things. From, starting a simple personal website, to setting up a profile on a social networking site, to starting a blog using any of the several hosted blog platform solutions. But if you're starting a home business - on or offline, establishing an Internet presence begins with creating a website for your business, where the introductions between potential customers and the products and/or services you offer take place. In many cases, this involves obtaining a domain name, getting reliable web hosting, and building your website.

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• 3 Steps to Establishing an Internet Presence

  In today's World Wide Web, establishing an Internet presence could mean a number of things. From, starting a simple personal website, to setting up a profile on a social networking site, to starting a blog using any of the several hosted blog platform solutions. But if you're starting a home business - on or offline, establishing an Internet presence begins with creating a website for your business, where the introductions between potential customers and the products and/or services you offer take place. In many cases, this involves obtaining a domain name, getting reliable web hosting, and building your website.

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• Best C++ Portable time library for game development

  - by Darkenor

  I'm venturing into the dark world of portable development and I'm looking for a nice library to keep track of system time for all game events. So far I've turned to trust boost and found: This boost library But I'm wondering if it there are some alternatives. I use boost a lot and (while I like it) I find that it sometimes takes me longer to figure out how to use the generic code than to write my own...not-so-generic code. (Ya, ya...I know. I should be less lazy). But anyway, advice appreciated! :)

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• ?Oracle??HCM????Tony Kender???7???

  - by user758881

  Oracle?????Tony Kender,????HCM?????????,??????????????????????? ?: ????????HCM????,???????????? Kender: ?HCM?????????,????????????????Oracle??????????? ?????,?? ERP, Supply Chain, EPM, ? CX,??????,????????????????HCM? ?: ????????????????HCM???? Kender:????,??????????????,?????????????????????????HCM????????——??????????????????????????????????????????????????????HCM???,????????????,?????,?????????,??????????HR?Payroll??? ?: ??????????HCM????,??????? Kende:????????????????,????????,????????????????????????HCM??3??4????5??????????????????????????????????????????,???????????HCM???????????,??????HR??,????????????????????????????????Oracle????????????????HCM?????????????????? ?: Oracle HCM?????????? Kender:???,Oracle?HCM????????HCM???????????????????HCM?,?????????,???????JD Edwards, PeopleSoft ?Oracle E-Business Suite HCM??????????????HCM?????????????,??????????? ?: ??????????Oracle HCM?? Kender:??,?????????????????,???????????Oracle HCM????????????HCM????,??????????????????????IT????????,??????????????????——?????????????????,???????????????????,?? Customer 2 Cloud,?????Oracle HCM on premise???????????Oracle HCM???? ?: ?????????HCM???????? Kender:??,???????????:“?????????????????????????,???????????????????????????????????” Oracle HCM?????????????????????????????,????????????Larry Ellison?Oracle HCM World? keynote ??:“?Facebook?????”? ?: ????????HCM?????,???????????? Kender:????????,????????????????????????????????????????????????????????????????????????????????,????????????????????????????,???????90????????,??????????????Oracle HCM????????????????? ??,????????,???????????????????????????????????????????????,?????????????????????????,???????????????????????Oracle HCM?,??????????????????HCM????????——?????????????????,???on premise ??????????

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• ??????????? Oracle OpenWorld Tokyo 2012 ?????? ~?????????????~ ????????!

  - by M.Morozumi

  Oracle OpenWorld Tokyo 2012?JavaOne Tokyo 2012 ???????????????????????????Oracle Open World ?????????????????2????????? Exadata ???????·DBA·????????? Exadata?????????(???)???Oracle Exadata Database Machine ??? Exadata Storage Server X2-2 ??????????Exadata ???????????????????????????????????Database Machine?????????????????????????????????????????????????????????? ?????????(???) 2012?4?2?~4?3? Oracle BI Suite EE 10g??????! 11g????????????????????!! Oracle BIEE 10g???? 11g Report/Dashboard ?????Oracle BI Suite EE 10g?????????11g???(????)????????????????????????? Oracle BIEE 10g???? 11g Report/Dashboard ?? 2012?4?3?~4?4?

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