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  • How to write a network game?

    - by TomWij
    Based on Why is so hard to develop a MMO?: Networked game development is not trivial; there are large obstacles to overcome in not only latency, but cheat prevention, state management and load balancing. If you're not experienced with writing a networked game, this is going to be a difficult learning exercise. I know the theory about sockets, servers, clients, protocols, connections and such things. Now I wonder how one can learn to write a network game: How to balance load problems? How to manage the game state? How to keep things synchronized? How to protect the communication and client from reverse engineering? How to work around latency problems? Which things should be computed local and which things on the server? ... Are there any good books, tutorials, sites, interesting articles or other questions regarding this? I'm looking for broad answers, but specific ones are fine too to learn the difference.

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  • How do I create a file?

    - by Shira
    Hi, I'm following instructions about Installing and setting TFTPD in Ubuntu. It asks to Create /etc/xinetd.d/tftp and put this entry: service tftp { protocol = udp port = 69 socket_type = dgram wait = yes user = nobody server = /usr/sbin/in.tftpd server_args = /tftpboot disable = no } What does it mean to create? Is there any command I need to type? And "put this entry" - it means to type in one line all the lines above? I don't know Linux & I need your help please.

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  • Confused with X.ORG version number

    - by caligula
    There is my trouble: I'm trying to install ATI drivers on my Dell Vostro 3350 laptop. On the AMD's site I followed steps to determine which driver should I use. After selecting what hardware I use I got a link to download amd-driver-installer-12-3-x86.x86_64.run and below was a description of that driver that it was compatible with X.Org version from 6.7 to 7.6. And I do not know what version of X.Org my Ubuntu uses. Cause after googling I found that version is 7.6 in Ubuntu 11.10. But after typing: X -version I got the output: X.Org X Server 1.10.4 Release Date: 2011-08-19 X Protocol Version 11, Revision 0 So what is the exact version of X.Org in Ubuntu 11.10 and how should one reliably determine it? Can anyone construe? Thanks.

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  • Database Insider Newsletter: February 2011 Edition Available

    - by jenny.gelhausen
    The February edition of the Database Insider Newsletter is now available. This edition covers the upcoming IOUG's Day of Real World Performance Tour What's coming for Collaborate 2011 How Oracle helps you steer clear of security pitfalls and much more... Enjoy! var gaJsHost = (("https:" == document.location.protocol) ? "https://ssl." : "http://www."); document.write(unescape("%3Cscript src='" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'%3E%3C/script%3E")); try { var pageTracker = _gat._getTracker("UA-13185312-1"); pageTracker._trackPageview(); } catch(err) {}

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  • Document Foundation : pas de LibreOffice OnLine cette année mais un feuille de route officielle, le portage pour Android progresse

    La Document Foundation : pas de LibreOffice OnLine cette année Mais un feuille de route officielle, le portage pour Android progresse Edit 16h : La Document Foundation vient de corriger une confusion dans la communication autour des déclinaisons Cloud et mobiles de son fork d'OpenOffice.org. Elle annonce une feuille de route. La Document Foundation a posé hier la dernière pierre de la dernière version de la branche 3.4 de sa suite bureautique open-source. Résultat, son énergie va à présent être entièrement tournée vers la branche 3.5 de LibreOffice. Et vers les nouvelles déclinaisons de son fork d'OpenOffice.org. La première...

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  • OpenJDK In The News: Oracle Outlines Roadmap for Java SE and JavaFX at JavaOne 2012

    - by $utils.escapeXML($entry.author)
    The OpenJDK Community continues to host the development of the reference implementation of Java SE 8. Weekly developer preview builds of JDK 8 continue to be available from jdk8.java.net.OpenJDK continues to thrive with contributions from Oracle, as well as other companies, researchers and individuals.The OpenJDK Web Site Terms of Use was recently updated to allow work on Java Specification Requests (JSRs) for Java SE to take place in the OpenJDK Community, alongside their corresponding reference implementations, so that specification leads can satisfy the new transparency requirements of the Java Community Process (JCP 2.8).“The recent decision by the Java SE 8 Expert Group to defer modularity to Java SE 9 will allow us to focus on the highly-anticipated Project Lambda, the Nashorn JavaScript engine, the new Date/Time API, and Type Annotations, along with numerous other performance, simplification, and usability enhancements,” said Georges Saab, vice president, Software Development, Java Platform Group at Oracle. “We are continuing to increase our communication and transparency by developing the reference implementation and the Oracle-led JSRs in the OpenJDK community.”Quotes taken from the 14th press release from Oracle mentioning OpenJDK, titled "Oracle Outlines Roadmap for Java SE and JavaFX at JavaOne 2012".

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  • building bittorrent client from scratch

    - by Bill
    I'm new to programming. I find reading introductory programming books boring. I think these doesn't teach enough of the problem solving skills that I need. So I decided to build a bitTorrent client. I think I understand to some point how the protocol works. I have also downloaded the source code of deluge bittorrent client. I have access to python documentation too. I need to know if there are some resources available that can help me build a bitTorrent client that are more detailed than the wikipedia article here: http://en.wikipedia.org/wiki/BitTorrent

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  • WebCenter in Action: ResCare

    - by Kellsey Ruppel
    Register Now for this webcast. ResCare Solves Content Lifecycle Challenges with Oracle WebCenter Complex documents must be created, assembled, reviewed, and tracked. To avoid fragmented, chaotic information processes, organizations must adopt an integrated set of strategies, standards, best practices, and technologies for managing information. Attend this webcast to learn how Oracle WebCenter has allowed ResCare to: Solve content lifecycle challenges Reduce compliance and business risks Increase adoption of intranet as primary business communication tool Register now for this webcast.  REGISTER NOW Register now for this exclusive event. Tuesday, October 30, 2012 10:00 a.m. PT / 1:00 p.m. ET Presented by: Joe Lichtefeld, VP of Application Services & PMO, ResCare Wayne Boerger, Product Manager, TEAM Informatics Doug Thompson, EVP Global Development, TEAM Informatics Presented by : Copyright © 2012, Oracle and/or its affiliates. All rights reserved. Contact Us | Legal Notices and Terms of Use | Privacy Statement

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  • What failure can kill a long running IRC client? [closed]

    - by Xeoncross
    I have an IRC bot that I built in PHP using sockets that attempts to run forever and (if disconnected) reconnects again. I have it listening to several channels. Apparently it's fairly resilient, because it can run for several days before the process ends and CRON has to start it up again. However, based on the fact the process ends I'm assuming there are other conditions I'm not accounting for that are causing problems. I have nothing in my error logs giving me a hint. In addition, sometimes the process will continue running - but I notice it's no longer present in any of the channels on the IRC server which makes me think it violated some part of the protocol. I have logic setup to handle: reply to PING's correctly reconnect on disconnect (and reconnect to channels) respond to private messages (so someone doesn't ban it) prevent memory leaks What other failure could be killing my long-running IRC client?

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  • DSS: SOA 11g (11.1.1.6) Solutions- End To End B2B Scenarios

    - by JuergenKress
    For access to the Oracle demo systems please visit OPN and talk to your Partner Expert Demo Highlights This demo showcases various features of Oracle B2B like Comprehensive document management and trading partner management Extensive B2B protocol support Secure and reliable message exchange B2B batching feature B2B Security & B2B Reports/Metrics Complete end-to-end processes tracking Demo Architecture & Bill of Materials & Demo Collateral  & OFM Demos Corner & DSS Offerings & Scheduling Demos on DSS & DSS Support SOA & BPM Partner Community For regular information on Oracle SOA Suite become a member in the SOA & BPM Partner Community for registration please visit  www.oracle.com/goto/emea/soa (OPN account required) If you need support with your account please contact the Oracle Partner Business Center. Blog Twitter LinkedIn Mix Forum Technorati Tags: SOA Suite,SOA demo,dss,SOA Community,Oracle SOA,Oracle BPM,BPM,Community,OPN,Jürgen Kress

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  • Futures/Monads vs Events

    - by c69
    So, the question is quite simple: in an application framework, when performance impact can be ignored (10-20 events per second at max), what is more maintainable and flexible to use as a preferred medium for communication between modules - Events or Futures/Promices/Monads ? Its often being said, that Events (pub/sub, mediator) allow loose-coupling and thus - more maintainable app... My experience deny this: once you have more that 20+ events - debugging becomes hard, and so is refactoring - because it is very hard to see: who, when and why uses what. Promices (i'm coding in javascript) are much uglier and dumber, than Events. But: you can clearly see connections between function calls, so application logic becomes more straight-forward. What i'm afraid. though, is that Promices will bring more hard-coupling with them... p.s: the answer does not have to be based on JS, experience from other functional languages is much welcome.

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  • Ensuring ethernet is configured before continuing init scripts.

    - by Pete Ashdown
    Is there a better way to ensure that an ethernet port is configured before continuing through startup init scripts? When 802.3ad bonded ethernet is configured on Ubuntu, it takes some time before it finishes protocol negotiation and starts passing packets, because the networking script just configures, but does not verify that traffic is being passed. As a result, this can throw off some of the other network dependent scripts, like the init for drbd. Right now, I just have a loop that pings the gateway in a startup script, but this seems less than optimal: GATEWAYIP=10.0.0.1 while ( ! ping -c 1 $GATEWAYIP ); do echo gateway not up done

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  • Document Foundation : pas de LibreOffice OnLine cette année mais une feuille de route officielle, le portage pour Android progresse

    La Document Foundation : pas de LibreOffice OnLine cette année Mais un feuille de route officielle, le portage pour Android progresse Edit 16h : La Document Foundation vient de corriger une confusion dans la communication autour des déclinaisons Cloud et mobiles de son fork d'OpenOffice.org. Elle annonce une feuille de route. La Document Foundation a posé hier la dernière pierre de la dernière version de la branche 3.4 de sa suite bureautique open-source. Résultat, son énergie va à présent être entièrement tournée vers la branche 3.5 de LibreOffice. Et vers les nouvelles déclinaisons de son fork d'OpenOffice.org. La première...

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  • Switch to https

    - by Mike
    I'm looking to use an .htaccess file to use mod_rewrite to switch the protocol from http:// to https:// when someone hits my website. For instance, once someone goes to: http://www.mywebsite.com/ I'd like the browser to switch to: http*s*://www.mywebsite.com/ The same goes for the http://mywebsite.com/ - https://mywebsite.com This is the following code I've been using and I've experienced some odd things so if anyone could provide me with information if this is the right way to do it, or if you have a better way, please provide it. Thanks in advance. RewriteEngine On RewriteCond %{SERVER_PORT} !=443 RewriteRule ^(.*)$ https://www.ebaillv.com/$1 [R=301,L]

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  • Restricting access to sites

    - by Paul
    I'm having some problems configuring my local proxy server so that it would restrict access to certain websites. The proxy server I'm using is Squid; I edited its configuration file found in /etc/squid/squid.conf to include the following: acl wikipedia dstdomain .wikipedia.org http_access deny wikipedia I tried to redirect elinks to use Squid. According to Squid's config file, it listens to port 3128, so in /etc/elinks/elinks.conf I added the following: set protocol.http.proxy.host = "localhost:3128" I also restarted Squid with sudo /etc/init.d/squid restart, but I can still access the banned websites using Elinks. What did I do wrong?

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  • Is 301 redirect sufficient to solve WWW and HTTP/S duplication?

    - by Thomas Ojo
    I was reading about this article - SEO preference for WWW or HTTP:// protocol redirection? Do www websites rank better than NON-www? I have same problem but I needed a help on this further. What about https:// How will this be treated? Is the redirect 301 sufficient to solve the problem? I have a SEO company that says if possible, i should not have redirect but I don't think this is visible? Does permanent redirect in any way have effect on SEO services if properly done?

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  • Why won't Remmina connect to Windows 7 Remote Desktop?

    - by rfc1484
    I'm using Ubuntu and I'm trying to connect to another machine in a different network using remote desktop. In Windows7 I have made the following in order to activate remote desktop: I've gone to computer - properties - remote settings I've selected the option: "Allow connections from computers running any version of Remote Desktop I've opened "Windows Firewall with Advanced Security" In inbound rules I've enabled the rules for remote desktop (public and domain) I have also installed Remmina in the Ubuntu machine. For configuring it I did the following steps: Selected the RDP protocol In the server input I have written the Windows machine public IP. In username / password I have typed my login credentials (the same as my Windows admin account) But when I try to connect I get this error message: "Unable to connect to RDP server 89.130.251.160" If I ping my Windows7 machine, I have a correct response. Any suggestions?

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  • E-learning, VPN décentralisé et voitures connectées gagnent le concours de start-ups de l'Epitech : bravo aux jeunes développeurs

    E-learning, VPN décentralisé et voitures connectées gagnent le concours 2012 de start-ups de l'Epitech Créées par de jeunes développeurs Chaque année, l'Epitech organise un concours de création d'entreprise (baptisé EIP) auquel participent ses étudiants en 4ème et 5ème année. Le but est de leur mettre le pied à l'étrier et de leur faire toucher du doigt tous les impératifs (marketing, communication, partenariat, etc.) qu'ils seront amenés à gérer dans le monde du travail et des affaires. A la clef, en moyenne 15% des étudiants deviennent de « vrais » entrepreneurs. Pour l'école il s'agit évidemment d'une formidable vitrine pour rappeler que l'esprit d'initiative est au coeur de sa pédagogi...

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  • ipv6 just wont go away 12.10 server

    - by VladoPortos
    After very long time using Ubuntu old LTS version I have re-installed to new LTS 12.10, but I can't get rid of ipv6 ! I have did: in /etc/modprobe.d/blacklist.conf: blacklist ipv6 blacklist ip6table_filter blacklist ip6_tables in /etc/sysctl.conf net.ipv6.conf.all.disable_ipv6 = 1 net.ipv6.conf.default.disable_ipv6 = 1 net.ipv6.conf.lo.disable_ipv6 = 1 But ufw happily use v6 protocol, and in dmesg: ip6_tables: (C) 2000-2006 Netfilter Core Team . . IPv6: ADDRCONF(NETDEV_CHANGE): em1: link becomes ready What is going to take to get rid of IPv6 ? I swear Terminator didn't put so much fight.

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  • Why do XML namespace URIs use the http scheme?

    - by svick
    A XML namespace should be a URI, but it can use any URI scheme, including those that are not URLs. Then why do all widely used XML namespaces use the http scheme (e.g. http://www.w3.org/XML/1998/namespace), considering that trying to use the URI as an URL by retrieving that document using the HTTP protocol is not guaranteed to do anything useful (and often doesn't)? I understand the usefulness of DNS domains in namespace names to help guarantee uniqueness. But that doesn't require the http scheme, there could be a separate scheme for that (something like namespace:w3.org/XML/1998/namespace). This would avoid the confusion between URIs and URLs, while maintaining domain-based uniqueness.

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  • Laptop won't get to grub after meddling with kernels

    - by Joren
    I recently found out I had different kernel versions installed, so I removed the 3.9 kernel as proposed in this answer on my earlier question. After that, I updated my grub, but My laptop won't seem to reach it. Output of aptitude search linux | grep ^i: i libselinux1 - SELinux runtime shared libraries i libselinux1:i386 - SELinux runtime shared libraries i linux-firmware - Firmware for Linux kernel drivers i A linux-headers-3.11.0-12 - Header files related to Linux kernel versi i A linux-headers-3.11.0-12-generic - Linux kernel headers for version 3.11.0 on i linux-headers-3.11.4-031104 - Header files related to Linux kernel versi i linux-headers-3.11.4-031104-gen - Linux kernel headers for version 3.11.4 on i linux-headers-generic - Generic Linux kernel headers i linux-libc-dev - Linux Kernel Headers for development i linux-sound-base - base package for ALSA and OSS sound system i pptp-linux - Point-to-Point Tunneling Protocol (PPTP) C i syslinux - collection of boot loaders i syslinux-common - collection of boot loaders (common files) i syslinux-legacy - Bootloader for Linux/i386 using MS-DOS flo i util-linux - Miscellaneous system utilities How do I proceed to fix this error from my live cd?

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  • Speaking at the VS 2010 Launch at TechEd India this week

    Ill be speaking at TechEd India and the Visual Studio 2010 Launch in Bangalore, India this week. Ill be doing three sessions: Tuesday 2:30- Building RESTful Applications with the Open Data Protocol Wednesday 12:30-Building Applications with Silverlight 4.0 and WCF RIA Services Wednesday 2:30-Exploring the Silverlight 4.0 Business Features In addition, Team Telerik will be staffing a booth with Tee-shirts (hopefully if they get out of customs on time!) and live demos of our products and our brand new product to be announced today! See you at my sessions or at the booth! Technorati Tags: Telerik,TechEd 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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  • Webcast Replay: Extreme Performance for Consolidated Workloads with Oracle Exadata

    - by kimberly.billings
    If you missed our live webcast Extreme Performance for Consolidated Workloads with Oracle Exadata last week, the replay is now available. Watch the free on-demand webcast in which Tim Shetler, Vice President of Oracle Database Product Management, and Richard Exley, Consulting Member of Technical Staff, discuss how Oracle Exadata can help you can significantly improve application performance and reduce infrastructure costs by consolidating transaction processing, data warehousing, or mixed workloads on Oracle Exadata. Note: (1) Turn off pop-up blockers if the slides do not advance automatically. (2) Slides are available for download. var gaJsHost = (("https:" == document.location.protocol) ? "https://ssl." : "http://www."); document.write(unescape("%3Cscript src='" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'%3E%3C/script%3E")); try { var pageTracker = _gat._getTracker("UA-13185312-1"); pageTracker._trackPageview(); } catch(err) {}

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  • Google et Adobe se mettent au Social Analytics et proposent de chiffrer les retombées des actions marketing sur les réseaux sociaux

    Google et Adobe se mettent au Social Analytics Et proposent d'évaluer concrètement les retours sur investissement des actions marketing sur les réseaux sociaux Combien rapporte une campagne ou une opération marketing sur sur les réseaux sociaux ? Aujourd'hui, évaluer un tel ROI est un des défis pour les Webmarketeurs. Les managers et les décideurs veulent en effet de plus en plus intégrer Facebook ou Tweeter dans leurs stratégies de communication, mais ils veulent aussi savoir ce que cela rapporte. Google l'a bien compris et devrait proposer dans les semaines qui viennent de nouveaux indicateurs à Google Analytics. En résumé, Analytics pourra tracer les visites entra...

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  • What is REST (in simple English)

    - by Gaurav
    Lately I have become interested in familiarizing myself with REST. I tried reading wiki entry on REST, but it was of no help. I would really appreciate it if someone can explain in simple English (that is without unnecessary tech jargon) What is REST What position it occupies in web architecture ecosystem How tightly (or loosely) it is coupled with protocol. What are the alternatives to REST and how does REST compare with them. I understand it may not be possible to answer this in one or two paragraphs, in that case relevant links will be highly appreciated.

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