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  • How can I design 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; } } 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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  • Google se lance encore un peu plus dans la voix sur IP et la vidéo-conférence, au moment où Skype so

    Mise à jour du 19/05/10 Google se lance dans la voix sur IP et la vidéo-conférence Au moment où Skype sort la nouvelle version de son application Les deux faits ne sont pas liés, mais ils montrent que la voix sur Internet (VoIP) au sens large est un secteur en plein devenir. Après Gizmo5 (lire ci-avant), Google vient en effet de lancer une Offre Publique d'Achat (OPA) sur une société norvégienne spécialisée dans la « transmission du son et de la vidéo en temps réel » sur Internet. La définition d'une technologie qui fait furieusement penser à Skype. La direction de Global IP Solutions a d'ores et déjà annoncé qu'...

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  • How do I connect the seams between my terrain?

    - by gnomgrol
    I'm using c++ and D3D11 and I'm trying to create a (pretty) large terrain, lets say 4096x4096, maybe larger. I've got the basics of terrain creation and already split it up into chunks. But, when I'm rendering them (every chunk has its own vertex and index buffer, as well as its own heightmap), there are still little pieces missing between them. I read a lot about LOD(Level Of Detail) and GMM(Geometry Mipmap), but I can't really implement the theory I read. At the moment, it looks like this: I could really use some help, everything is welcome. If you have some good tutorials on any of this, please share them.

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  • L'informaticien, artisan des temps modernes ou le développement est-il plus proche d'un processus in

    L'informaticien, artisan des temps modernes ? Non, le processus complet est plus proche d'un processus industriel Salut, Je viens de lire à l'instant un billet sur l'informatique et un parallèle avec l'artisanat. C'est un sujet qui revient souvent. Peut-on comparer notre métier avec la pratique de l'artisanat ? Personnellement je ne le pense pas, notre métier peut couvrir un large spectre, du technicien spécialisé à l'expert dans son domaine mais en aucun cas je ne le comparerai à de l'artisanat. En fait je compare l'évolution des pratiques de création logicielles à...

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  • Where to start when digging into an existing J2EE codebase?

    - by Jacob Krustchinsky
    I work for a company that produces enterprise applications to be used by schools and districts to manage all of their tests and standards data. Their existing application is written in J2EE and is very large. I personally am a seasoned PHP and Ruby = RoR developer and I have been asked to attempt to implement easily added but crucial features to an existing J2EE codebase. I am very familiar with Java SE and know the architecture of a web application well. What I am asking for is, will this suffice for the task ahead and what tips can you give me in digging into the code base and actually efficiently adding these new features? Is there anything important I need to know before beginning and what can I expect in terms of problems and issues coming from a Java SE, PHP, RoR background? Time isn't too much of an issue, I should have plenty of time to familiarize myself with J2EE.Please also note, syntax will not be a problem here.

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  • How strict are standard employer IP agreements about coding outside of work?

    - by JosephRT
    I'm in negotiations for a position with a large corporation and I'm reading their employment terms. In their IP/copyright section they state that anything that I do outside of work that is "similar" to what I perform on the job is also theirs. I understand that it's intentionally very vague to protect them, but I'm also a little nervous that it could be abused. The way I read it, anything I produce outside of work could be claimed as well, because it would fall under "programming". Is this relatively standard? Could I negotiate more specific terms (I have asked if I could get clarification)? Should I be worried that they could abuse this? I just don't want to be caught in a situation where come up with a (potentially) great idea outside of work and they swoop down and lay claim to it.

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  • Is 500 million lines of code even remotely possible? [on hold]

    - by kmote
    The New York Times is reporting that the Healthcare.gov website contains "about 500 million lines of software code." This number, attributed to "one specialist", and widely repeated across the interwebs, seems incredibly far-fetched (even assuming a large fraction of that number includes standard libraries). If this is an accurate estimate, it would truly be staggering (as this fascinating infographic vividly reveals). I realize StackExchange:Programmers isn't Snopes.com, but I'd like to find out if anyone here believes this is even remotely possible. I'd like to know if there is a plausible system of accounting (using examples from publicly available data, if possible) that could lead someone to conclude that such an estimate is within the realm of reason. How could a codebase (by any measure) sum up to such an exhorbitant number of code lines?

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  • JSR 348, 355, and 358: Moving JCP Forward

    - by arungupta
    The three-step JCP evolution consists of the following JSRs: • JSR 348, JCP transparency • JSR 355, Merging the two existing Executive Committees • JSR 358, complex issues moved postponed from JSR 348 The JSR 348 is already completed and JSR 355 is scheduled to be complete later this year. JSR 358 was recently filed and plans to revise several items such as modify the JSPA, Process Document, and a large number of complex issues. Because of the nature and scope of work, the Expert Group consists of representatives from all companies in the Executive Committee. Following the process set by JSR 348, all the work is done in open at jsr358.java.net. All the email discussions are here and JIRA here. Read Patrick Curran's blog for more details as well. The JSR review ballot ends on Jul 9th however the work has already happening for the past few months. Now is your chance to contribute and make JCP more effective!

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  • When removing a bunch of files from a website, is 301 to the start page appropriate? [closed]

    - by Uwe Keim
    Possible Duplicate: What to do with random pages after a 301 redirect? Currently, we are working on modifying the contents of a website of one of our products. Since we are re-positioning the product, we would like to delete roughly 50% (around 200) of the pages of the website. My questions, in terms of SEO are: Would it have a negative effect if Google suddenly sees the large page drop? Is it OK to provide a 301 to the start page of the website for all removed pages?

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  • SQL Server Data Type Precedence

    I am executing a simple query/stored procedure from my application against a large table and it's taking a long time to execute. The column I'm using in my WHERE clause is indexed and it's very selective. The search column is not wrapped in a function so that's not the issue. What could be going wrong? Schedule Azure backupsRed Gate’s Cloud Services makes it simple to create and schedule backups of your SQL Azure databases to Azure blob storage or Amazon S3. Try it for free today.

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  • Oracle E-Business Financials Recommended Patch Collections (RPCs) for R12.1.3 Have Been Released for August 2012

    - by Oracle_EBS
    What is a Recommended Patch Collection (RPC)? An RPC is a collection of recommended patches consolidated into a single, downloadable patch, ready to be applied. The RPCs are created with the following goals in mind: Stability: Address issues that occur often and interfere with the normal completion of crucial business processes, such as period close--as observed by Oracle Development and Global Customer Support. Root Cause Fixes: Deliver a root cause fix for data corruption issues that delay period close, normal transaction flow actions, performance, and other issues. Compact: While bundling a large number of important corrections, we have kept the file footprint as small as possible to facilitate uptake and minimize testing. Reliable: Reliable code with multiple customer downloads and comprehensive testing by QA, Support and Proactive Support. RPCs are available for the following products: Cash Management Collections E-Business Tax Financials for India Fixed Assets General Ledger Internet Expenses iReceivables Loans Payables Payments Receivables Subledger Accounting For the latest Financials Recommended Patch Collections (RPCs), please view: EBS: R12.1 Oracle Financials Recommended Patches [Doc ID 954704.1].

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  • What things need to be considered when redeveloping the whole UI for a web app?

    - by Robin
    I am the lead developer on a thick client web app (Java swing) which we're looking at recreating as a web app. We're part way through some initial work, have chosen a framework on the server and integrated with our previous backend code. We're just starting to get into the client side of things, looking at javascript frameworks etc. The previous system was pretty sensibly architected so the logic is already serverside. The challenge ahead of us is really about redeveloping the user interface rather than anything else. What would be the list of things to consider in redeveloping the entire user interface for any application? I'm trying to get an idea of how large a task might still be ahead of me and the team.

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  • Encouraging business and team members to write more code

    - by Aliixx
    I am really interested to hear any ideas or working practices that can be adopted to encourage our team of developers to write more code. A little background here is involves a team of varying disciplines, experience and qualities and the nature of the work has a large focus on bug fixes and business logic / data validation over writing lots of new greenfield code or even refactoring. We are attempting to move to a more Agile philosophy and really what would be great is to hear any ideas that can be sold to the team and / or the business with the aim of: Writing more new code to improve experience, abilities and increase exposure to newer and emerging patterns and practices. Energizing the effort of the team and inspire. Encouraging wider input of new ideas, patterns and practices from the team as a whole. I would be very interested (and grateful) to hear any ideas or examples of ideas that can help here. Thanks!

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  • Resolution text mode Removing ubuntu-server 10.04

    - by Fabin
    Hello Friends .. I have ubuntu-server on my server and also in terminals and an application squeegee in text mode. This version 9.10 of ubuntu-server system came with a resolution at the terminal, which makes use of the application, the fonts (letters) are very small. Please, if anyone knows how to take the resolution of text mode 10:04 ubuntu server, tell me. To illustrate. I need the resolution is to get as Debian, large fonts! Still using version 9.04, it was the last that still has not implemented the resolution at the terminal (text mode). I remind you that non-use graphical interface. Only text mode. Thanks.

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  • Does anyone have a specific example of using the Flyweight Pattern?

    - by Jeremy E
    I have been studying design patterns and came accross the fly weight pattern. I have been trying to see opportunities to use the pattern in my applications but I am having trouble seeing how to use it. Also, what are some signs that a fly weight pattern is being used when I read other peoples code? According to the definition it says: Use sharing to support large numbers of fine-grained objects efficiently. If I read it right Dictionaries and Hashtables could be instances of fly weights is this correct? Thanks in advance.

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  • How to Choose the Best SEO Expert

    The internet has turned out to be one of the most powerful marketing tools ever invented by man. Its reach of millions of people is several times more than any other medium. Web marketing and web promotion are today an integral part of the sales plans of any medium or large scaled enterprise. As the world rapidly moves to the internet, if your company does not have a website today, you will not be able to make a place for yourself in the future. Irrespective of the business the company is involved in, its presence on the internet is absolutely unavoidable nowadays.

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  • "Never do in code what you can get the SQL server to do well for you" - Is this a recipe for a bad design?

    - by PhonicUK
    It's an idea I've heard repeated in a handful of places. Some more or less acknowledging that once trying to solve a problem purely in SQL exceeds a certain level of complexity you should indeed be handling it in code. The logic behind the idea is that for the large majority of cases, the database engine will do a better job at finding the most efficient way of completing your task than you could in code. Especially when it comes to things like making the results conditional on operations performed on the data. Arguably with modern engines effectively JIT'ing + caching the compiled version of your query it'd make sense on the surface. The question is whether or not leveraging your database engine in this way is inherently bad design practice (and why). The lines become blurred further when all the logic exists inside the database and you're just hitting it via an ORM.

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  • How do I render an entire frame to a Texture2D?

    - by redcodefinal
    I asked a question here: C# XNA Make rendered screen a texture2d But, I ended up not getting the exact result I was looking for since I didn't ask the question right. In a game I am writing, I render an extremely large city out of objects, this can cause lag when moving the camera to view things that are off screen. I need a way to render then ENTIRE city, even the stuff that is off screen, and make it into a Texture2D. The answer I chose for the last one didn't work entirely right because it only gets what is on screen, not what is off.

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  • How to calculate shot angle and velocity to hit a moving target?

    - by Guen
    I am developing a 2D Android game and I am making an aiming algorithm for AI projectiles to hit enemies either following a path, or free moving. At the moment it just calculates where the target will be after a distance and fires a projectile to meet it at that distance. Of course this means varying the projectile speed to meet the target. Does anyone have any tips for a simple-ish algorithm (optimal-ish) to calculate when the projectile needs to fire and where it needs to aim if it can only travel at a constant velocity? Say the projectile goes twice the speed of the target? The only way I can think of involves searching and seems quite large.

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  • Synchronizing Mysql Table Schema [on hold]

    - by user1122069
    I have some difficulty keeping track of my SQL changes in a text file in SVN. One solution that I am aware of is to put the SQL queries in files (1.sql, 2.sql...) and to manually load each file at the proper time. Besides missing commas, the process is too cumbersome when builds become more frequent. I have actually taken to asking a co-worker to send me his SQL changes on Skype and we just apply the changes immediately on our local, development, and production servers (using three PhpMyAdmin tabs). I have seen several GUI tools mentioned in similar questions on SO, but these are actually more work and less automated than the aforementioned methods. Is there any standardized process by which this is done in an automated way? I can only guess that large companies build their own mechanisms of keeping track of database schema changes (yet I can't find a word about it - maybe they use files?). This question was closed as off-topic on Stack Overflow, so I am re-posting it here.

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  • Should Business Interfaces be part of the Model layer?

    - by Mik378
    In an oriented-services enterprise application, isn't it an antipattern to mix Service APIs (containing interface that external users depends on) with Model objects (entities, custom exceptions objects etc...) ? According to me, Services should only depends on Model layer but never mixed with it. In fact, my colleague told me that it doesn't make sense to separate it since client need both. (model and service interfaces) But I notice that everytime a client asks for some changes, like adding a new method in some interface (means a new service), Model layer has to be also delivered... Thus, client who has not interested by this "addition" is constrained to be concerned by this update of Model... and in a large enterprise application, this kind of delivery is known to be very risked... What is the best practice ? Separate services(only interfaces so) and model objects or mix it ?

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  • iptables firewall to protect against automated entries

    - by Kenyana
    I am getting unusually large calls on my app. I have implemented CSRF Check over ajax and its working but am still getting so many calls. My guess is that someone has a script that is 'logged' in and making all these calls. Could someone please share a good iptables script for blocking ip's that run 10 calls to /controler/action in a second. I am using `/sbin/iptables -A INPUT -p tcp --syn --dport $port -m connlimit --connlimit-above N -j REJECT --reject-with tcp-reset save the changes see iptables-save man page, the following is redhat and friends specific command service iptables save` That is from cyberciti

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  • Protecting the integrity of a game state while minimizing amount of data sent

    - by espais
    I'm developing a game in PHP/jQuery, and naturally have to be wary of any sort of data coming from the client. At present, I have tables of data representing the map (2D roguelike), monsters, items, and player(s). Initially, my thought was to simply package it all in a JSON object and send it every game tick, however when actually looking at the data I realized that's quite a large packet to be sending. So, my question is what is a good approach for minimizing data sent to the client? Obviously I would need to figure out some way of validating whatever it sends back. Initially we'd hoped to do some minimal verification on the client-side, but each time we thought of one thing we could do it is immediately invalidated with tools like Firebug. Kind of an open question I realize, but we want to get this right before we move on with our implementation so we don't have to shoehorn in bugfixes later on.

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  • In-memory DB to perform intersects on set slices

    - by IanC
    I have a specific programming need where I need to efficiently store large sorted sets in memory, query them for ranges, and intersect them against other sets that are also queried for ranged. I am looking at Redis, but I can't see a range slice command. MongoDB can only use 1 index, so it has to perform row-level scans, whereas I wish to process using columns that are intersected. I'm also looking at Counchbase, but can't easily determine from the documentation if it is suited to this. I know it uses Memcached, which is AFAIK not suited to this usage. Could anyone share potential solutions for this specific problem? EDIT For example, I need to perform the following: Get the IDs of all cars where the price is between 2000 and 3000, and intersect that will all cars where the engine capacity is between 3000 and 4000.

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  • Need suggestions on what you regard as &ldquo;security&rdquo;

    - by John Breakwell
    I’m currently writing a large piece on MSMQ security and wanted to check I was covering the right areas. I have some doubts as I’ve seen the occasional MSMQ forum question where a poster has used the word “security” in different contexts to what I was expecting. So here are the areas I plan to cover: Message security encryption on the wire (SSL and IPSEC) encryption of the message (MSMQ encryption) encryption of the payload (data encryption) signing and authentication Queue security SIDs and ACLs Discoverability Cross-forest issues Storage security NTFS permissions unencrypted data Service security Ports and Firewalls DOS attacks Hardened mode (HTTP only) RPC secure channel requirement authenticated RPC requirement Active Directory object permissions Setup Administrator requirements What else would you want to see?

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