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  • How to plan/manage multi-platform (mobile) products?

    - by PhD
    Say I've to develop an app that runs on iOS, Android and Windows 8 Mobile. Now all three platforms are technically in different program languages. The only 'reuse' that I can see is that of the boxes-and-lines drawings (UML :) charts and nothing else. So how do companies/programmers manage the variation of the same product across different platforms especially since the implementation languages differ? It's 'easier' in the desktop world IMO given the plethora of languages and cross-platform libraries to make your life easier. Not so in the mobile world. More so, product line management principles don't seem to be all that applicable - what is same and variant doesn't really matter - the application is the same (conceptually) and the implementation is variant. Some difficulties that come to mind: Bug Fixing: Applications maybe designed in a similar manner but the bug identification and fixing would be radically different. A bug on iOS may/may-not be existent for that on Android. Or a bug fix approach on one platform may not be the same on another (unless it's a semantic bug like a!=b instead of a==b which would require the same 'approach' to fixing in essence Enhancements: Making a change on one platform would be radically different than on another Code-Design Divergence: They way the code is written/organized, the class structures etc., could be very different given the different implementation environments - leading to further reuse of the (above) UML models. There are of course many others - just keeping the development in sync and making sure all applications are up to the same version with the same set of features etc. Seems the effort is 3x that of a single application. So how exactly does one manage this nightmarish situation? Some thoughts: Split application to client/server to minimize the effect to client side only (not always doable) Use frameworks like Unity-3D that could take care of the cross-platform problem (mostly applicable to games and probably not to other applications etc.) Any other ways of managing a platform line? What are some proven approaches to managing/taming the effects?

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  • Using mod_speling with multi-level htaccess and rewriterules

    - by michaelcgorman
    We recently switched formats for managing our 301s. For the most part, everything went well, but it seems to have stopped mod_speling from working properly. Here's what we changed: old /var/www/html/.htaccess: RewriteEngine on RewriteBase / # Change SHTML to HTML RewriteRule ^(.*)\.shtml$ $1.html [R=permanent,L] # Change PCF to HTML ('cause, you know, we probably have CMS users like that...) RewriteRule ^(.*)\.pcf$ $1.html [R=permanent,L] # Force WWW subdomain for all requests RewriteCond %{HTTP_HOST} !^www.example.edu$ [NC] RewriteRule ^(.*)$ http://www.example.edu/$1 [R,L] # User accounts are on sun.example.edu RedirectMatch ^/~(.*)$ http://sun.example.edu/~$1 # Remove index.html at the end of URLs RewriteCond %{REQUEST_URI} ^(.*/)index\.html$ [NC] RewriteRule . %1 [R=301,NE,L] Redirect 301 /academics/calendar2012-13.html http://www.example.edu/academics/calendar.html Redirect 301 /academics/departments/ http://www.example.edu/majors/ Redirect 301 /academics/Pre-Medical.pdf http://www.example.edu/academics/Pre-Medicine.pdf Redirect 301 ... new /var/www/html/.htaccess: RewriteEngine on RewriteBase / # Change SHTML to HTML RewriteRule ^(.*)\.shtml$ $1.html [R=permanent,L] # Change PCF to HTML ('cause, you know, we probably have CMS users like that...) RewriteRule ^(.*)\.pcf$ $1.html [R=permanent,L] # Force WWW subdomain for all requests RewriteCond %{HTTP_HOST} !^www.example.edu$ [NC] RewriteRule ^(.*)$ http://www.example.edu/$1 [R,L] # User accounts are on sun.example.edu RedirectMatch ^/~(.*)$ http://sun.example.edu/~$1 # Remove index.html at the end of URLs RewriteCond %{REQUEST_URI} ^(.*/)index\.html$ [NC] RewriteRule . %1 [R=301,NE,L] RewriteCond %{REQUEST_FILENAME} !-f RewriteCond %{REQUEST_FILENAME} !-d RewriteRule ^(.*) 404/$1 And then we added a new file at /var/www/html/404/.htaccess: RewriteEngine on RewriteBase /404 RewriteRule ^academics/calendar2012-13.html$ /academics/calendar.html [R=302,L] RewriteRule ^academics/departments/$ /majors/ [R=301,L] RewriteRule ^academics/Pre-Medical.pdf$ /academics/Pre-Medicine.pdf[R=301,L] RewriteRule ... I do have (Webmin-based) access to the httpd.conf (though we don't want to store all our 301s there, if possible). We're running Apache 2.2.15 on RHEL 6 on a server in our own data center. Like I said, the only problem we're seeing is that mod_speling isn't doing its magic anymore. The new format has so many advantages over the old that we really don't want to go back, but mod_speling is so nice to have that we'd also really like it to work if possible. Any ideas for how we might be able to fix mod_speling?

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  • Lua and multi-paradigm programming: scope and capabilities

    - by Ef Es
    Despite having started learning programming with Pascal and C, after the jump to OO (C++, Java) I lost sense of the structured programming paradigm. I have started learning Lua and I have researched many tutorials, but all of them only cover basic operations and language features and capabilities. They feel more like a reference doc than a programmer's guide. Now, when trying to work with day to day tasks, how does one go through most common design patterns like observer, or multithreaded programming, creating UI elements and polling system calls for keyboard or sensors? Is it even feasible in this languages or you have to work with the C binding, libraries and low-level programming to get most stuff done? Do I get the Lua scope wrong?

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  • Dualboot Asus n56v (ubuntu / win 7 x64) - ubuntu doesn't detect partition table made by windows

    - by user76439
    I have an Asus n56v and I've got troubles installing Ubuntu 12.04 x64. I already have installed Windows 7 x64! The hard drive is: Hitachi HTS547575A9E384 My problem: The installation program doesn't recognize the already existing partitions and is offering only options where there are partitions. Can someone help me out? Is this an ACPI/IDE conflict, missing driver or conflict with Windows 7? (I'm not an expert on Linux, only working sometimes with it.) I now tried out some options concerning EFI with a GTP-table. Everything worked but I wasn't able to fix a dual boot (Windows boot loader) nor with GRUB2. The laptop is still having a BIOS, but is able to boot DVDs/CDs in EFI-mode. Now I try to avoid EFI and GTP using the old windows MBR style. I reinstalled Windows, so far no problem. When I want to try to install Ubuntu, it doesn't detect the already existing partition table. It is just showing me an empty space for the whole disk. Other threads like Ubuntu 12.04 does not see windows already install on my computer (dual installation) don't help me out. os-prober shows me a correct result. I don't know how to deal with gdisk as shown in Installer doesn't detect existing partition table/windows 7 partition. I have 750GB for the whole disk. I'm using: 90GB for Windows reserved partition + system partition, 500GB for data and the rest should be for SWAP and linux-system. How can I make Ubuntu detect the partition table?

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  • How to name multi-setter?

    - by IAdapter
    I'm struggling with how to name this method, I don't like the "set" prefix, because I feel it should be reserved for normal "dumb" setters and some tools might not like it (i did not check it in checkstyle, pmd, etc., but I got a feeling they won't like it.) for example (in java, but I feel its language agnostic) public void setField1Field2(String field1, String field2) { this.field1 = field1; this.field2 = field2; } The only purpose of this method is ONLY to set, this method is needed and cannot be joined with any other (because of framework used).

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  • Need to find a find a fast/multi-user database program

    - by user65961
    Our company is currently utilizing Excel and have been encountering a series of issues for starters we have multiple users sharing this application. We utilize it write our schedules for our employees and generate staffing levels. May someone give me please or inform me what are the pros and cons of this program and offer suggestions for another database that allows multiple users to share and also give the pros and cons need something that will hold massive data and allow sharing, protecting capabilities.

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  • FFmpeg multi pass encoding

    - by Levan
    Sorry, I am really new to this, and have problems doing some tasks without help. So I have a terminal command: ffmpeg \ -y \ -i '/media/levan/BEEA60D8EA608E89/Downloads/Videos/Tony Braxton - Un-Break My Heart.VOB' \ -s 1920x1080 \ -aspect 16:9 \ -r 25 \ -b 15550k \ -bt 19792k \ -vcodec libtheora \ -acodec libvorbis \ -ac 2 \ -ar 48000 \ -ab 320k \ ddd.ogg and I want to have 3 pass video in output video, but how do I accomplish this? I found that I must write -pass n command some where, but where to write it I do not know. I tested this and wrote -pass 3 at the end but then the terminal just showed a > symbol.

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  • Have search engines recognise multi-lingual sites

    - by mark
    Hello. I have organised my site by language using the following structure: www.domain.com #spanish language version www.domain.com/en #english language version The site is of Spanish subject matter hence Spanish language takes priority at root of domain. Although the site is new at this stage I would hope visiting from google.com and google.es would return English and Spanish versions respectively. Are there any particular steps I need take to separate the two. Should I add them both as individual sites in Google's webmaster tools and also should I submit individual site maps for each 'site' or as a whole? Thanks in advance.

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  • c# multi - point selection on an image

    - by sinem
    I'm designing interface with visual c# for my image processing project. i'm not good at c# codding. and i haven't enough time. I need point selection on an image and classification these points for using in my image processing code at vhdl. Orginal image will stay at a picturebox and i will use selected image in another picturebox. How i can select points on an image ? please could you help me or send me similar code? I'm getting so confused thank you.

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  • Multi-screen and Nvidia GT220

    - by Bohors
    Excuse me first for my broken English I have 3 monitors on two Nvidia GT220. Unity 2D works fine after using the proprietary drivers. But no way to use compiz effects. I'm on Ubuntu 11.10 (I also tested for curiosity 12.04 for the same result) I noticed in the "System Settings" / "details" that my graphics card is not recognized (graphics card "unknown") and "View" only returns me my first screen (with the correct resolution) also in unknown. $ lspci | grep VGA 01:00.0 VGA compatible controller: NVIDIA Corporation GT216 [GeForce GT 220] (rev a2) 05:00.0 VGA compatible controller: NVIDIA Corporation GT216 [GeForce GT 220] (rev a2) xorg.conf : Section "ServerLayout" Identifier "Layout0" Screen 0 "Screen0" 0 0 Screen 1 "Screen1" Below "Screen0" Screen 2 "Screen2" RightOf "Screen0" InputDevice "Keyboard0" "CoreKeyboard" InputDevice "Mouse0" "CorePointer" Option "Xinerama" "1" EndSection Section "Files" EndSection Section "InputDevice" # generated from default Identifier "Mouse0" Driver "mouse" Option "Protocol" "auto" Option "Device" "/dev/psaux" Option "Emulate3Buttons" "no" Option "ZAxisMapping" "4 5" EndSection Section "InputDevice" # generated from default Identifier "Keyboard0" Driver "kbd" EndSection Section "Monitor" # HorizSync source: edid, VertRefresh source: edid Identifier "Monitor0" VendorName "Unknown" ModelName "Acer V243HL" HorizSync 30.0 - 80.0 VertRefresh 55.0 - 75.0 Option "DPMS" EndSection Section "Monitor" # HorizSync source: edid, VertRefresh source: edid Identifier "Monitor1" VendorName "Unknown" ModelName "LG Electronics L1920P" HorizSync 30.0 - 83.0 VertRefresh 56.0 - 75.0 Option "DPMS" EndSection Section "Monitor" # HorizSync source: edid, VertRefresh source: edid Identifier "Monitor2" VendorName "Unknown" ModelName "Acer V243HL" HorizSync 30.0 - 80.0 VertRefresh 55.0 - 75.0 Option "DPMS" EndSection Section "Device" Identifier "Device0" Driver "nvidia" VendorName "NVIDIA Corporation" BoardName "GeForce GT 220" BusID "PCI:1:0:0" EndSection Section "Device" Identifier "Device1" Driver "nvidia" VendorName "NVIDIA Corporation" BoardName "GeForce GT 220" BusID "PCI:5:0:0" Screen 0 EndSection Section "Device" Identifier "Device2" Driver "nvidia" VendorName "NVIDIA Corporation" BoardName "GeForce GT 220" BusID "PCI:5:0:0" Screen 1 EndSection Section "Screen" Identifier "Screen0" Device "Device0" Monitor "Monitor0" DefaultDepth 24 Option "TwinView" "0" Option "TwinViewXineramaInfoOrder" "DFP-0" Option "metamodes" "1920x1080_60_0 +0+0; nvidia-auto-select +0+0" SubSection "Display" Depth 24 EndSubSection EndSection Section "Screen" Identifier "Screen1" Device "Device1" Monitor "Monitor1" DefaultDepth 24 Option "TwinView" "0" Option "metamodes" "CRT: nvidia-auto-select +0+0" SubSection "Display" Depth 24 EndSubSection EndSection Section "Screen" Identifier "Screen2" Device "Device2" Monitor "Monitor2" DefaultDepth 24 Option "TwinView" "0" Option "metamodes" "DFP: nvidia-auto-select +0+0" SubSection "Display" Depth 24 EndSubSection EndSection Section "Extensions" Option "Composite" "Disable" EndSection Have you any idea? thanks

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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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  • Advice on how to build html5 basic tile game (multi player, cross device)

    - by Eric
    I just read http://buildnewgames.com/real-time-multiplayer/ which explains the fundamentals and bets practices to build a massive real time multiplayer html5 game. My question is however given the “simplicity” of the game I need to build (simple kind of scratch game where you find or not something behind a tile), do I really need complex tools (canvas or node.js for example) ? The game The gamestakes place with a picture of our office as a background (tilemap). For HR purpose, we wish to create the following game fore employees: each day they can come to the website and click on a certain number of tiles (3 max per day) and find behind it motivation advice and interesting facts about the company. The constraints and rules the screen is divided into isometric 2D square tiles. There are basically an image (photograph of our office) number of tiles on the screen game: about 10,000 to much more (with scroll , see below) the players can scroll in 4 directions there are only 2 types of tiles: already open and closed player can open tiles that have not been yet open by other players there is no path for players : any player can click on any tile on the screen at any moment (if it’s not already done by another player) 2 players can’t be on the same tile at the same moment (or if they can, I’ll have to manage to see which one clicked on it first) only one type of player (all with similar roles), no weapon, no internal score… very simple game. no complex physics (collision only occurs if 2 players are on the same tile) The target I need to achieve: cross device, cross browsers high performance reaction (subsecond reactions) average nb of players per hour: up to 10K players per hour (quite high indeed but it’s because we aim at proving our case for the game to our business unit) So what I would like to know: 2D Tiled map: Do I need tiledmapeditor or can I enable me split the screen like here ? should I use canvas or plain html/css could be sufficient for my need? do I need a game engine/framework such as melon.js or crafty./js ? (even if the game play is extremely basic, I do need mouse and touché device support, mouse emulations on touch devices…) or ca I easily/quickly do it without? for my constraints and targets, should I use CPU acceleration ? for my constraints and targets, should I use web workers ? for the database, for a massively real time game should I avoid to put the current locations of player in MySQL as i feel it might slow me down. What kind of DB should I implement ? Thanks for your help !

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  • Cloud consolidation handling multi databases

    - by llaszews
    I have spoken about virtualization and the different types of virtualization. Which includes OS zones, application server domains, database schemas, VLANS and other approaches. Another approach is to create a virtually federated database in the cloud. DBSpaces is a company that has a technology to created a virtually federated database in the cloud. DBSpaces is a Virtual Database technology that allows an organisation thru a single Virtual Database access multiple data sources (or database spaces) in real-time. Additionally dbSpaces can be configured to access an organisations data internally using a remote gateway so that their dbSpace is seamless across the Public and Private cloud.

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  • How to Make Sample Login Multi Company in use mvc4 [closed]

    - by ksyahputra
    How to make for Login Company in use VS.2010 .Net and StoreProcedur TabelUserPayroll *UnitID *UserLogin *UserPassword *ActiveYN TabelUserPersmissions *UnitID *UserLogin *IPAddress *PermissionAccess *PermissionView *PermissionAdd *PermissionEdit *PermissionDelete *PermissionReports TabelMasterCompany *UnitID *UnitNameCompany *CurrencyID TabelHeader *UnitID *PurchaseNumber *Vendor *WareHouse *CurrencyID *Total TabelDetail *UnitID *PurchaseNumber *ItemID *Qty *Price

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  • Vlc And other Multi Media Problems

    - by MrMagu
    ive tried numerous Free Multimedia Programs on ubuntu and i get the same result when i go to watch one of my movies off my other hardrive it allways ends up full screening with a stuck image in the middle and vlc ends up looking pitch black. ive look all over the web for this issue im wondering if anyone is experinceing the same problems I Dont know if it has to do with the duel monitors ive tried adding and re adding the repositorys but it seems to be doing the same repetive thing for over a month now do i need to reinstall the whole system or what idk anyhelp please would be much appreciated Ty MrMagu Xorg Conf File nvidia-settings: X configuration file generated by nvidia-settings nvidia-settings: version 304.37 (buildd@allspice) Sun Sep 9 05:59:26 UTC 2012 Section "ServerLayout" Identifier "Layout0" Screen 0 "Screen0" 0 0 InputDevice "Keyboard0" "CoreKeyboard" InputDevice "Mouse0" "CorePointer" Option "Xinerama" "0" EndSection Section "Files" EndSection Section "InputDevice" # generated from default Identifier "Mouse0" Driver "mouse" Option "Protocol" "auto" Option "Device" "/dev/psaux" Option "Emulate3Buttons" "no" Option "ZAxisMapping" "4 5" EndSection Section "InputDevice" # generated from default Identifier "Keyboard0" Driver "kbd" EndSection Section "Monitor" # HorizSync source: edid, VertRefresh source: edid Identifier "Monitor0" VendorName "Unknown" ModelName "Ancor Communications Inc VE247" HorizSync 30.0 - 83.0 VertRefresh 50.0 - 76.0 Option "DPMS" EndSection Section "Monitor" Identifier "Monitor1" VendorName "Unknown" ModelName "Ancor Communications Inc VE247" HorizSync 30.0 - 83.0 VertRefresh 50.0 - 76.0 EndSection Section "Device" Identifier "Device0" Driver "nvidia" VendorName "NVIDIA Corporation" BoardName "Quadro FX 1500" EndSection Section "Device" Identifier "Device1" Driver "nvidia" VendorName "NVIDIA Corporation" BoardName "Quadro FX 1500" BusID "PCI:1:0:0" Screen 1 EndSection Section "Screen" Removed Option "metamodes" "DFP-0: nvidia-auto-select +0+0, DFP-1: nvidia-auto-select +1920+0; DFP-0: 1920x1080 +0+0, DFP-1: 1920x1080 +1920+0" Removed Option "metamodes" "DFP-0: nvidia-auto-select +0+0; DFP-0: 1920x1080 +0+0; DFP-0: 1920x1080_60 +0+0; DFP-0: 1680x1050 +0+0; DFP-0: 1680x1050_60 +0+0; DFP-0: 1440x900 +0+0; DFP-0: 1440x900_60 +0+0; DFP-0: 1280x1024 +0+0; DFP-0: 1280x1024_75 +0+0; DFP-0: 1280x1024_60 +0+0; DFP-0: 1280x960 +0+0; DFP-0: 1280x960_60 +0+0; DFP-0: 1152x864 +0+0; DFP-0: 1152x864_75 +0+0; DFP-0: 1024x768 +0+0; DFP-0: 1024x768_75 +0+0; DFP-0: 1024x768_70 +0+0; DFP-0: 1024x768_60 +0+0; DFP-0: 800x600 +0+0; DFP-0: 800x600_75 +0+0; DFP-0: 800x600_72 +0+0; DFP-0: 800x600_60 +0+0; DFP-0: 800x600_56 +0+0; DFP-0: 640x480 +0+0; DFP-0: 640x480_75 +0+0; DFP-0: 640x480_72 +0+0; DFP-0: 640x480_60 +0+0; DFP-0: nvidia-auto-select @1920x720 +0+0" Removed Option "metamodes" "DFP-0: nvidia-auto-select +0+0; DFP-0: 1920x1080 +0+0; DFP-0: 1920x1080_60 +0+0; DFP-0: 1680x1050 +0+0; DFP-0: 1680x1050_60 +0+0; DFP-0: 1440x900 +0+0; DFP-0: 1440x900_60 +0+0; DFP-0: 1280x1024 +0+0; DFP-0: 1280x1024_75 +0+0; DFP-0: 1280x1024_60 +0+0; DFP-0: 1280x960 +0+0; DFP-0: 1280x960_60 +0+0; DFP-0: 1152x864 +0+0; DFP-0: 1152x864_75 +0+0; DFP-0: 1024x768 +0+0; DFP-0: 1024x768_75 +0+0; DFP-0: 1024x768_70 +0+0; DFP-0: 1024x768_60 +0+0; DFP-0: 800x600 +0+0; DFP-0: 800x600_75 +0+0; DFP-0: 800x600_72 +0+0; DFP-0: 800x600_60 +0+0; DFP-0: 800x600_56 +0+0; DFP-0: 640x480 +0+0; DFP-0: 640x480_75 +0+0; DFP-0: 640x480_72 +0+0; DFP-0: 640x480_60 +0+0" Identifier "Screen0" Device "Device0" Monitor "Monitor0" DefaultDepth 24 Option "TwinView" "1" Option "TwinViewXineramaInfoOrder" "DFP-0" Option "Stereo" "0" Option "nvidiaXineramaInfoOrder" "DFP-0" Option "metamodes" "DFP-0: nvidia-auto-select +0+0, DFP-1: 1920x1080 +1920+0; DFP-0: 1920x1080 +0+0, DFP-1: nvidia-auto-select +1920+0; DFP-0: 1920x1080_60 +0+0; DFP-0: 1680x1050 +0+0; DFP-0: 1680x1050_60 +0+0; DFP-0: 1440x900 +0+0; DFP-0: 1440x900_60 +0+0; DFP-0: 1280x1024 +0+0; DFP-0: 1280x1024_75 +0+0; DFP-0: 1280x1024_60 +0+0; DFP-0: 1280x960 +0+0; DFP-0: 1280x960_60 +0+0; DFP-0: 1152x864 +0+0; DFP-0: 1152x864_75 +0+0; DFP-0: 1024x768 +0+0; DFP-0: 1024x768_75 +0+0; DFP-0: 1024x768_70 +0+0; DFP-0: 1024x768_60 +0+0; DFP-0: 800x600 +0+0; DFP-0: 800x600_75 +0+0; DFP-0: 800x600_72 +0+0; DFP-0: 800x600_60 +0+0; DFP-0: 800x600_56 +0+0; DFP-0: 640x480 +0+0; DFP-0: 640x480_75 +0+0; DFP-0: 640x480_72 +0+0; DFP-0: 640x480_60 +0+0" SubSection "Display" Depth 24 EndSubSection EndSection Section "Screen" Identifier "Screen1" Device "Device1" Monitor "Monitor1" DefaultDepth 24 Option "Stereo" "0" Option "metamodes" "DFP-1: 1920x1080 +0+0" SubSection "Display" Depth 24 EndSubSection EndSection Section "InputClass" Identifier "Mouse Remap" MatchProduct "Saitek Cyborg R.A.T.7 Mouse" MatchDevicePath "/dev/input/event*" Option "ButtonMapping" "1 2 3 4 5 6 7 8 9 0 0 0 0 0 0" EndSection Pictures http://tinypic.com/r/34o7j1h/6 http://tinypic.com/r/3rn20/6 Ty so Much Mr Magu

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  • Installing multi-boot Linux system

    - by user94924
    I have a dual (XP/Linux) boot Compaq Presario S4500UK with a couple of spare partitions on the boot drive which I want to use for testing different Linux distros/configs before installing them on "live" machines. I tried this with Oneiric which worked fine until I came to uninstalling the test system. Fortunately Oneiric uses Grub2 and so redirecting the bootloader to work from the original Linux partition was a piece of cake - if a bit annoying. I now need to do some tests on Hardy and DSL (Damned Small Linux), neither of which use Grub2. Question: Is it possible to install a test operating system without adding/replacing the bootloader (ie so I can still use Grub2 from the original partition with its nice interface and recovery facilities)? Is there another way of uninstalling/decommisioning a test OS which doesn't trash the boot loader? (The only way I know to do this is by deleting/reformatting the partition which takes with it the bootloader which is in that partition). Any help would be much appreciated. Tks jg1

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  • multi-thread in mmorpg server

    - by jean
    For MMORPG, there is a tick function to update every object's state in a map. The function was triggered by a timer in fixed interval. So each map's update can be dispatch to different thread. At other side, server handle player incoming package have its own threads also: I/O threads. Generally, the handler of the corresponding incoming package run in I/O threads. So there is a problem: thread synchronization. I have consider two methods: Synchronize with mutex. I/O thread lock a mutex before execute handler function and map thread lock same mutex before it execute map's update. Execute all handler functions in map's thread, I/O thread only queue the incoming handler and let map thread to pop the queue then call handler function. These two have a disadvantage: delay. For method 1, if the map's tick function is running, then all clients' request need to waiting the lock release. For method 2, if map's tick function is running, all clients' request need to waiting for next tick to be handle. Of course, there is another method: add lock to functions that use data which will be accessed both in I/O thread & map thread. But this is hard to maintain and easy to goes incorrect. It needs carefully check all variables whether or not accessed by both two kinds thread. My problem is: is there better way to do this? Notice that I said map is logic concept means no interactions can happen between two map except transport. I/O thread means thread in 3rd part network lib which used to handle client request.

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  • Multi Level Security via Roles

    - by Geertjan
    I'm simulating a small scenario: Users can be dragged into roles; roles can be dragged into role groups. When a drop is made into a role group, a new role is created (WindowManager.getDefault().setRole("")). Then, when the user logs in, they log into a particular role. Depending on the role they log into, a different role group is assigned, which maps to a certain "role" in NetBeans Platform terms, i.e., the related level of security is applied and the related windows open.

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  • Multi threading to execute multiple makefiles

    - by user105205
    The problem is it takes lot of time(20-30 minutes) to build our application. There are around 5000+ files and the code is divided into various subsystems, which can be built independently. Each subsystem has its own makefile. My question is: Is it possible to create a thread for each makefile so that all the subsystems are built in parallel and subsequently run a makefile to merge them all? If it is possible, how to proceed about it?

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  • Scalability of multi-threading in game server

    - by Taylor Hill
    What is a reasonable number of threads for a simple 2D mmo in Java? Is it reasonable to have two threads per connection, one for the input stream and one for the output stream? The reason I ask is because I use a blocking method on the input stream, and a workaround seems unnecessarily complex if I were to try to get around it without adding threads. This is mostly for my own edification; I don't expect to have 5 million people playing it ever, or even 5, but I'm wondering what a good scalable solution is, and if this is reasonable for a small server (<30 connections).

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