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  • Are scheduled job servers the right choice for a time sensitive game engine?

    - by maple_shaft
    I am currently architecting and designing an exciting new web application that will be entering into some areas that I have very little experience in, game development. The application is not necessarily a game, but there are some very time sensitive tasks and scheduled jobs that a server will need to run to perform game related activities (Eg. New match up starts at noon every day for a 12 day tournament, updating scoreboards at 5pm every day, etc...) In the past I have typically used cron jobs with the Quartz Scheduler running within a web application server, but I know that this isn't likely a scalable solution for the truly massive userbase that management is telling me to expect (Granted they are management and are probably highly optimistic about this) and also for how important the role of these tasks are in this web application. The other important thing I want to consider is that I want to avoid SPOF (Single Point Of Failure). If the primary job server goes down, another job server should be able to successfully run the job in its place. I suppose this can be done appropriately record locking and database transactions. My question is if scheduled jobs like CRON running on a web application server are a wise design choice given the time sensitive game tasks of this application, or is there something more appropriate for running a scalable game engine parallel to the web application servers?

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  • Login and redirect to user home page [migrated]

    - by Rich
    The problem I can't currently solve is when a user logs in. They arrive at the site (index.php) and enter username and password, which gets submitted via a Post form back to index.php - if there are incorrect details then they get an error message. But if successful then I would like them to be taken to their user home page - but I can't do this! I am left presenting them with a link to the home page, which is more than a little clunky. Seems there must be an obviously solution - never seen a site before that didn't redirect! Not sure is the answer is PHp, HTML, or Javascript.

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  • Utilisez-vous le framework Web JBoss Seam destiné à simplifier le développement d'applications Web ? Partagez votre expérience

    L'équipe Java vous propose un débat concernant le framework Web JBoss Seam. Ce framework, disponible depuis début 2005 et proposé par Gaving King le créateur d'Hibernate, veut simplifier le développement d'applications Web. Pour cela Seam se base sur les standards EJB3 et JSF proposés par Java EE et se focalise à réduire la complexité de ces différentes briques (voir article Présentation globale de Seam pour les principes de base). Aujourd'hui Seam atteint la version 3 et offre de nombreuses avancées pour simplifier le développement Web. En parallèle, de nombreux framework Web ont déjà su s'...

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  • multitenancy with some data sharing

    - by user55108
    I'm in the planning stages of a new webapp, and I am leaning strongly toward a multitenancy model. The app has a file storage function, where the user can upload (and operate on) files. I would like the ability of the user to share these files, however. How is this typically accomplished in a multi-tenant model? The example would be something like google docs. Each user has their own files; they can edit and tag and build collections with these files. Then, they can share a doc or a collection with someone else for collaboration. If every user has their own Database and tables, what strategy would one use to allow this kind of sharing while minimizing duplication of files and associated metadata?

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  • Adding multiple data importers support to web applications

    - by DigiMortal
    I’m building web application for customer and there is requirement that users must be able to import data in different formats. Today we will support XLSX and ODF as import formats and some other formats are waiting. I wanted to be able to add new importers on the fly so I don’t have to deploy web application again when I add new importer or change some existing one. In this posting I will show you how to build generic importers support to your web application. Importer interface All importers we use must have something in common so we can easily detect them. To keep things simple I will use interface here. public interface IMyImporter {     string[] SupportedFileExtensions { get; }     ImportResult Import(Stream fileStream, string fileExtension); } Our interface has the following members: SupportedFileExtensions – string array of file extensions that importer supports. This property helps us find out what import formats are available and which importer to use with given format. Import – method that does the actual importing work. Besides file we give in as stream we also give file extension so importer can decide how to handle the file. It is enough to get started. When building real importers I am sure you will switch over to abstract base class. Importer class Here is sample importer that imports data from Excel and Word documents. Importer class with no implementation details looks like this: public class MyOpenXmlImporter : IMyImporter {     public string[] SupportedFileExtensions     {         get { return new[] { "xlsx", "docx" }; }     }     public ImportResult Import(Stream fileStream, string extension)     {         // ...     } } Finding supported import formats in web application Now we have importers created and it’s time to add them to web application. Usually we have one page or ASP.NET MVC controller where we need importers. To this page or controller we add the following method that uses reflection to find all classes that implement our IMyImporter interface. private static string[] GetImporterFileExtensions() {     var types = from a in AppDomain.CurrentDomain.GetAssemblies()                 from t in a.GetTypes()                 where t.GetInterfaces().Contains(typeof(IMyImporter))                 select t;       var extensions = new Collection<string>();     foreach (var type in types)     {         var instance = (IMyImporter)type.InvokeMember(null,                        BindingFlags.CreateInstance, null, null, null);           foreach (var extension in instance.SupportedFileExtensions)         {             if (extensions.Contains(extension))                 continue;               extensions.Add(extension);         }     }       return extensions.ToArray(); } This code doesn’t look nice and is far from optimal but it works for us now. It is possible to improve performance of web application if we cache extensions and their corresponding types to some static dictionary. We have to fill it only once because our application is restarted when something changes in bin folder. Finding importer by extension When user uploads file we need to detect the extension of file and find the importer that supports given extension. We add another method to our page or controller that uses reflection to return us importer instance or null if extension is not supported. private static IMyImporter GetImporterForExtension(string extensionToFind) {     var types = from a in AppDomain.CurrentDomain.GetAssemblies()                 from t in a.GetTypes()                 where t.GetInterfaces().Contains(typeof(IMyImporter))                 select t;     foreach (var type in types)     {         var instance = (IMyImporter)type.InvokeMember(null,                        BindingFlags.CreateInstance, null, null, null);           if (instance.SupportedFileExtensions.Contains(extensionToFind))         {             return instance;         }     }       return null; } Here is example ASP.NET MVC controller action that accepts uploaded file, finds importer that can handle file and imports data. Again, this is sample code I kept minimal to better illustrate how things work. public ActionResult Import(MyImporterModel model) {     var file = Request.Files[0];     var extension = Path.GetExtension(file.FileName).ToLower();     var importer = GetImporterForExtension(extension.Substring(1));     var result = importer.Import(file.InputStream, extension);     if (result.Errors.Count > 0)     {         foreach (var error in result.Errors)             ModelState.AddModelError("file", error);           return Import();     }     return RedirectToAction("Index"); } Conclusion That’s it. Using couple of ugly methods and one simple interface we were able to add importers support to our web application. Example code here is not perfect but it works. It is possible to cache mappings between file extensions and importer types to some static variable because changing of these mappings means that something is changed in bin folder of web application and web application is restarted in this case anyway.

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  • SSH automatic logon works for one user but not the other

    - by tinmaru
    I want to enable automatic ssh login using the .ssh/config file for my git user. Here is my .ssh/config file: Host test HostName myserver.net User test IdentityFile ~/.ssh/id_rsa Host git HostName myserver.net User git IdentityFile ~/.ssh/id_rsa It works for my test user but not for my git user so my global SSH configuration is correct. The configuration are exactly the same as far as I know. It used to work with git user but I'm unable what change has broken the automatic logon. When I type: ssh -v git I get the following log: ... debug1: Authentications that can continue: publickey,password debug1: Next authentication method: publickey Offering RSA public key: /Users/mylocalusername/.ssh/id_rsa debug1: Authentications that can continue: publickey,password debug1: Next authentication method: password [email protected]'s password: _ Does anyone know what could be a possible difference

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  • How can I designed multi-threaded application for larger user base

    - by rokonoid
    Here's my scenario, I need to develop a scalable application. My user base may be over 100K, every user has 10 or more small tasks. Tasks check every minute with a third party application through web services, retrieving data which is written in the database, then the data is forwarded to it's original destination. So here's the processing of a small task: while(true){ Boolean isNewInformationAvailable = checkWhetherInformationIsAvailableOrNot(); If(isNewInformationAvailable ==true){ fetchTheData(); writeToDatabase(); findTheDestination(); deliverTheData(); isAvailable =false; } } Here is the question: as the application is large, how should I approach designing this. I'm going to use Java to write it. Should I use concurrency, and how would you manage the concurrency?

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  • Setting up a LAMP VM server for Development and Testing?

    - by TdotThomas
    Info: I would like to set up a VM server on my local computer which will serve pages in the exact same way as my current hosting (but only to me on my local computer). I currently pay a big web hosting company to host my website & web store and they are doing a great job, but I would like to be able to work on my Web site and its corresponding MySQL DB, HTML, and PHP code without being at risk of messing something completely up on the live servers. My current plan of action: Set up a VM webserver with Debian, MySQL, PHP, Apache. Copy web store (PHP/HTML) code to VM server. Copy my current MySQL databases from my hosting provider and install on VM server. Modify and test new features on VM server. Upload MySQL DB and HTML/PHP code back to web host's server where it should work as before but with new modifications. Questions: Now I'm pretty sure I have steps one and two down correctly but I can't for the life of me figure out how to proceed next, so here are my questions. I have my /etc/host file set up so www.MySite.test redirects to the IP address of the local VM webserver. Once I import my PHP/HTML files and MySQL file whats the best way to navigate around the fact that all of my files and DBs will reference www.MySite.com. I can export my MySQL dbs but do I also have to export my MySQL users and passwords to access those db or are those coded into my html/php code?

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  • Une API pour le service de raccourcissement d'URL de Google à la disposition des développeurs Web

    Une API pour le service de raccourcissement d'URL de Google Est mise à la disposition des développeurs Web Google vient de publier une API pour Goo.gl, son service de raccourcissement d'URL. L'API permettra aux développeurs d'intégrer le service Goo.gl à leurs pages Web et à leurs différents projets Web. Le service de raccourcissement d'URL Goo avait été déployé par Google en 2009 pour se lancer sur le marché des « URL-Shortner » et concurrencer ainsi Bit.ly. Depuis son lanc...

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  • Releasing patches and updates to web service users

    - by Kalidoss.M
    I have written one web services using Java. Its already live (Up & Running). During development I have SVN(repository) + Jira for task maintenance + Maven for building the web services. Now i have some small update for my web services and i have created that task in Jira and committed the files in svn with respect to Jira-Id after all testing, etc.. Say my web services is used by 10 clients, we did not give our source code to them. Is there any steps/procedure available to release patch/updates? Is there any way to render/create the change log at the build time (maven). How do i manage the change log for all version or Patch updates during build time? (Automatically)

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  • How to build a good service layer in ASP.NET?

    - by Swippen
    I have looked through some questions, technologies for building a good service layer but I have some questions regarding this that I need help with. First some information of what I have for requirements. We currently have a number of web applications that talk to each other in a spiderweb looking way (all talking to each other in a confusing way via webservices and database data). We want to change this so that all applications go through a service layer where we can work more with cache and encapsulate common functionality and more. We want this layer to also have a Web API so that 3rd party clients can consume information from the service. The problem I see is that if we build the service layer with say MVC4 Web API don't we need to communicate between the application using the webAPI meaning we have to construct URLs and consume JSON/Xml. That does not sound too effective. I assume a better method would be working with entities and WCF to communicate between the application but then we might loose the Web API magic? So the question is if there is a way to consume a service layer as both a Web API (JSON/XML) and as a more backend service layer with entities. If we are forced to use 2 different service layers we might have to duplicate some functionality and other bad things. Hope the question is clear enough and please ask if you need any more information.

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  • Managing a Web Portal

    - by A competent translator
    After skimming almost all questions tagged "books" here at Pro Webmasters to find a book on managing web portals I found references to general web mastering. Are there books on managing and curating content of public web portals , i.e. a governmental portal for a given department or agency ? I need a reference on the day-to-day management and best practices of a portal and its content. Also welcomed are references on managing multilingual portals.

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  • 12 Must Have Google Chrome Extensions For Web Designers

    <b>Tech Drive-In:</b> "Google Chrome extensions pool is growing and growing fast. Firefox has been the primary tool for web developers for a long time now. Tools like Firebug in Firefox has taken cult status among web developers. But things are slowly changing now and a number of good alternatives for Firefox web developer extensions can be found among Google Chrome extensions too."

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  • Web Development Company - Dedicated PHP Developers in Demand

    PHP programming has many features that can make a website attractive and interactive, the two most important necessities to survive in the World Wide Web. To get the maximum of the invested money, web owners should consider outsourcing the development process to an Indian web designing and development company.

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  • Invalid user names when creating a LDAP account

    - by h1d
    I'm trying to set up a system where a visitor can enter any user name in a form to create a new user and in the end it gets built on LDAP directory and I'm planning that to be mapped as a UNIX account as well (on Ubuntu Linux) by making the system look up for system accounts on the LDAP. Doing so is fine, but I feel that many user names should be avoided, one of the obvious being 'root' and all the other user names taken for daemons etc. How do you tackle at this problem? Do you make up a list of disallowed user names by checking /etc/passwd? I was thinking that if, internally, the user names could be prepended as 'ldap_' or something, it will avoid any naming conflicts but that seems hard when the LDAP entry name is 'joe' but the system account will look like 'ldap_joe'. Not even sure how that can be achieved.

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  • Why is Web SQL database deprecated?

    - by user221287
    I am making a hybrid Android app. At first I decided to use localStorage, after spending 2 days, I realized that it is very strange and so dropped it. Then, I picked up indexedDB, after spending today's whole day and actually getting the output in Google Chrome, it is not running inside a WebView of the android app. And I never used Web SQL database at all because it was deprecated. Anyhow, it has come to my notice that PhoneGap still uses Web SQL and android's browsers support it. Why was Web SQL deprecated in the first place? And will it be a good idea for me to go with Web SQL now?

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  • Storing images in file system and returning URLs or virtually resizing and returning byte arrays?

    - by ismaelf
    I need to create a REST web service to manage user submitted images and displaying them all in a website. There are multiple websites that are going to use this service to manage and display images. The requirements are to have 5 pre-defined image sizes available. The 2 options I see are the following: The web service will create the 5 images, store them in the file system and and store the URL's in the database when the user submits the image. When the image is requested, the web service will return an array of URLs. I see this option to be a little hard on the hard drive. The estimates are 10,000 users per site, and lets say, 100 sites. The heavy processing will be done when the user submits the image and each image is going to be pulled from the File System. The web service will store just the image that the user submits in the file system and it's URL in the database. When the user request images, the web service will get the info from the DB, load the image on memory, create its 5 instances and return an object with 5 image arrays (I will probably cache the arrays). This option is harder on the processor and memory. The heavy processing will be done when the images get requested. A plus I see for option 2 is that it will give me the option to rewrite the URL of the image and make them site dependent (prettier) than having a image repository for all websites. But this is not a big deal. What do you think of these options? Do you have any other suggestions?

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  • Google Analytics: Track user usage and flow

    - by Quintin Par
    Can someone help to query Google analytics to track a specific user behavior and usage pattern? Currently I pass user id’s to GA as _setCustomVar(2, 'id', id, 1); This is session based. But I am yet to master how I can utilize this to view usage pattern & behavior for the passed id. Say, I need to understand the visualization flow for one id or the page view count for that id etc Rephrasing, can I filter all existing reports for a specific id that I can select?

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  • Vim and emacs usage/use case/user statistics

    - by G. Kayaalp
    I wonder if there are statistical documents/research based on use of the two major text editors, in which amount of usage is compared to use case, be it programming language, industry, user age, OS and/or many other things I can't think of now. I don't need this information for an assignment/homework or something, I'm just curious about it. I've been searching this for some time, not very intensively, and only thing I have found was this: Emacs user base size Lastly, I want to denote that I'm not looking for estimations. I'm not asking if one editor is better that the other, nor I am expecting help on choice between them. I'm not asking for opinions.

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