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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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  • MySQL: Best of Breed Database

    - by Bertrand Matthelié
    Oracle offers best of breed technology at every layer of the stack, from servers and storage to applications. Discover why MySQL is a best of breed database solution for: Web-based applications, including the next generation of highly demanding web, cloud, mobile and social application Distributed applications requiring a powerful and reliable embedded database Custom and departmental enterprise applications on Windows and other platforms Check out our Resource Center to get access to white papers and other resources. And, remember to register for MySQL Connect if you haven’t done so yet. You can still save US$ 300 over the on-site fee – Register Now!

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  • Effective methods for managing work tasks? (documenting/remembering/prioritizing)

    - by Kaleb Brasee
    I'm looking for suggestions on effective methods that I can use to document, remember and prioritize tasks at work. Many of the these tasks belong to a primary project, but they also exist for independent initiatives. The tasks themselves cover everything from development to documentation to discussions, with varying priorities, and deadlines ranging from right away to a few months from now. Historically I have used a notepad to keep track of these tasks, with a star next to an item indicating it needs to be done and a check mark when it's completed. However, as I gain more responsibilities and more things to manage: it becomes harder to make sure I've done everything (because some things get lost 5 pages back) it becomes harder to remember what's most important to do next it becomes harder to keep track of dependencies between tasks Has anyone found methods that have made their tasks easier to manage? I've considered adding some meta-data to keep track of what's most important and dependencies, or possibly switching to an app that could automate this (if such a thing exists). Something that's accessible anywhere would definitely be a plus.

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  • could not save the file /usr/... permission denied (13.04)

    - by plaguedoctor
    I am running Ubuntu 13.04 and am trying to create an .sh file for conky in /usr/bin using gedit. When trying to save I get the error dialogue: Could not save the file /usr/bin/conky-start.sh You do not have the permissions necessary to save the file. Please check that you typed the location correctly and try again." From searching, I think I have to run a command in terminal to allow permission, but I couldn't find out what that is. Edit: I'm trying to create the file conky-start.sh, not change or run it. Thus far, I've opened gedit, copied and pasted some required info from the net, and I'm trying to save-as /usr/bin/conky-start.sh Perhaps I need to create the file first in terminal, then edit it? How would I do that?

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  • ASP.NET Combo Box and List Box Performance Improvements - v2010 vol 1

    Check out this great new performance feature of our ASP.NET combo box and list box controls for the DXperience v2010.1 release. You can now manually populate lists with items based on the currently applied filter criteria. This means that you can significantly decrease web server workload by loading only a subset of all items when working with large datasets. For instance, when using a large data source, you can only request a few records to be visible on the screen. The rest of the items can...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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  • Is it possible to lose some directories when upgrading from 11.10 to 12.04?

    - by maythux
    Last day I upgraded my Ubuntu 11.10 desktop to Ubuntu 12.04. I was running a KVM virtual about 7 machines and managed by virt-manage software. Anyway when I finished upgrading I found that virt-manager is not working. So I had to reconfigure it again and install some other missing packages that was deleted! Eventually, I managed to solve this issue. Then I started to restore my virtual machines. I restored 2 machines without any problems. The third and fourth ones (Windows) made a check disk that lasted more that 6 hours but finally it worked. Other machines I can't find their attached hard disks. I don't know what happened but I can't find those files. Does upgrading delete files? Is there anyway to restore those files?

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  • Using Enums for comparing string values in Switch

    - by kaleidoscope
    Problem Scenario: There is an enum keeping track of operations to be performed on a table Public Enum PartitionKey { Createtask, Updatetask, Deletetask } User is entering the value for the operation to be performed and the code to check the value entered in switch case. Switch (value) {           case PartitionKey.Createtask.ToString():          {          Create();          break;          }          case PartitionKey.Updatetask.ToString():          {           Update();           break;          }          case PartitionKey.Deletetask.ToString():          {           Delete();          break;          } } and it displays as error as “.” Solution: One of the possible implmentation is as below. Public Enum PartitionKey: byte { Createtask, Updatetask, Deletetask } Switch ((PartitionKey)(Int32.Parse(value))) {          case PartitionKey.Createtask:          {                   Create();                   break;          }          case PartitionKey.Updatetask:          {                    Update();                   break;          }          case PartitionKey.Deletetask:          {                    Delete();                   break;          }          default:          {                   break;          } } Technorati Tags: Enum,A Constant Value is required,Geeta,C#

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  • Apple pushnotification [closed]

    - by VIVEK
    I have a PHP script located in path like /var/www/vhosts/hostname/httpdocs/webservices, I have both PHP script and .pem files there, and I have called the .pem file in the script properly, but still when I run the script , I don't get push notification , instead i get warnings such as: Warning: stream_socket_client() [function.stream-socket-client]: Unable to set local cert chain file `ck_push_test.pem'; Check that your cafile/capath settings include details of your certificate and its issuer in /var/www/vhosts/ipartyapps.com/httpdocs/webservices/testPush.php on line 12 Warning: stream_socket_client() [function.stream-socket-client]: failed to create an SSL handle in /var/www/vhosts/ipartyapps.com/httpdocs/webservices/testPush.php on line 12 Warning: stream_socket_client() [function.stream-socket-client]: Failed to enable crypto in /var/www/vhosts/ipartyapps.com/httpdocs/webservices/testPush.php on line 12 Warning: stream_socket_client() [function.stream-socket-client]: unable to connect to ssl://gateway.push.apple.com:2195 (Unknown error) in /var/www/vhosts/ipartyapps.com/httpdocs/webservices/testPush.php on line 12 Failed to connect 0 I double checked everything path, permissions and owner/group of both script and .pem files, still not getting push notification. Any suggestions please, as it's urgent.

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  • Packaging an application written in C

    - by Jishnu
    I have an application written in C. What I have is a bunch of c files and some .h files. Also, I created a Makefile to do compilation. How can I compile this into a deb package. I searched google, and put everything into a "name_0.1.orig.tar.gz" file and created a folder named "name-0.1", then inside that folder, "dh_make" Skipping creating ../name_0.1.orig.tar.gz because it already exists Currently there is no top level Makefile. This may require additional tuning. Done. Please edit the files in the debian/ subdirectory now. You should also check that the name Makefiles install into $DESTDIR and not in / . I have a Makefile in name.tar.gz, why it is not recognizing ?

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  • How does N create it's tileset?

    - by Darestium
    I am trying to recreate a Multiplayer version of the popular flash game N in java. I have a single question however. Are the tiles for the games draw or are they defined with mathamatical formulars/In code? Since I do see how they would scale up in flash if they were not. So if anyone has any ideas how I should go about creating the tileset, or how they are created in the game please let me know. You can check out the game here.

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  • Do I lose/gain performance for discarding pixels even if I don't use depth testing?

    - by Gajoo
    When I first searched for discard instruction, I've found experts saying using discard will result in performance drain. They said discarding pixels will break GPU's ability to use zBuffer properly because GPU have to first run Fragment shader for both objects to check if the one nearer to camera is discarded or not. For a 2D game I'm currently working on, I've disabled both depth-test and depth-write. I'm drawing all objects sorted by their depth and that's all, no need for GPU to do fancy things. now I'm wondering is it still bad if I discard pixels in my fragment shader?

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  • How to determine which cells in a grid intersect with a given triangle?

    - by Ray Dey
    I'm currently writing a 2D AI simulation, but I'm not completely certain how to check whether the position of an agent is within the field of view of another. Currently, my world partitioning is simple cell-space partitioning (a grid). I want to use a triangle to represent the field of view, but how can I calculate the cells that intersect with the triangle? Similar to this picture: The red areas are the cells I want to calculate, by checking whether the triangle intersects those cells. Thanks in advance. EDIT: Just to add to the confusion (or perhaps even make it easier). Each cell has a min and max vector where the min is the bottom left corner and the max is the top right corner.

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  • How do I fix the Gparted message : Error while reading block at sector xxx ?

    - by Agmenor
    When I tried to move one of my partitions, I got some error messages. Here are some extracts: Move /dev/sda7 to the left 00:05:09 ( ERROR ) (...) check file system on /dev/sda7 for errors and (if possible) fix them 00:00:10 ( SUCCESS ) e2fsck -f -y -v /dev/sda7 (...) move file system to the left 00:04:52 ( ERROR ) perform read-only test 00:04:52 ( ERROR ) using internal algorithm read 114013242 sectors finding optimal blocksize (...) read 113357882 sectors using a blocksize of 1024 sectors 00:04:36 ( ERROR ) 22527034 of 113357882 read Error while reading block at sector 385849832 23182394 sectors read ( ERROR ) (...) libparted messages ( INFO ) Input/output error during read on /dev/sda What should I do to effectively move my partition?

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  • BleachBit: How to Completely Clear URL History in Firefox?

    - by tSquirrel
    14.04 / Firefox 29.0 I've been using Bleachbit to clear usage/file history, and for the most part it works great. However, it doesn't seem to clear the website hostnames out of the URL, at all. These addresses are not bookmarked. Also, the total URL isn't preserved, just the hostname. Visit site http://www.bluesnews.com/some_random_URL_string Exit Firefox Run Bleachbit, with ALL Firefox options selected Restart Firefox Check history: completely empty, other than bookmarked sites. www.bluesnews is NOT bookmarked Type "blue" which is Firefox automatically completes as "http://www.bluesnews.com/" Alternate Step #3: Use Firefox's built-in "Clear History" and select ALL entries with a time frame of "Everything". Same result as above. My inquiry in BB forums hasn't been responded to. I found Dan's proposed solution, however changing autocomplete in about:config only turns off the function, it doesn't actually stop storing URLs.

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  • 302 Redirect Issue for Joomla 2.5.7 version site

    - by DDD
    For my site i am using Joomla 2.5.7 version and FB comments tools for the articles in the site. i am getting the 302 redirect problem for the FB comments for the Articles to which i post. I have checked the url's here http://www.webconfs.com/http-header-check.php and got the following result with 302 redirect. for http://www.fijoo.com HTTP/1.1 302 Moved Temporarily = Date = Wed, 21 Nov 2012 09:46:39 GMT Server = Apache/2.2.22 (Unix) mod_ssl/2.2.22 OpenSSL/1.0.0-fips mod_auth_passthrough/2.1 mod_bwlimited/1.4 FrontPage/5.0.2.2635 mod_perl/2.0.6 Perl/v5.10.1 X-Powered-By = PHP/5.3.16 Set-Cookie = =en-GB; expires=Wed, 21-Nov-2012 10:46:40 GMT LOCATION = / Content-Length = 0 Connection = close Content-Type = text/html How to overcome this anyone please help.

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  • Mouse Not Detected & Network Not Connected After Installing Ubuntu 12.04 Desktop via Live USB

    - by albus_severus
    I just recently (+- 30 minutes ago) install Ubuntu 12.04 Desktop on my pc (dual boot) via Live USB (i check the "automatically install upgrade" option when installing it). unfortunately, at the login screen after the installation finished (after reboot), i cannot use my mouse! also, an error message occur saying that network connection is not available. but, when i restart again and using the "try Ubuntu without installing" in the Live USB, the problems didn't occur. i tried to googling this but failed to find any solution. and yes, i am totally green on Ubuntu and Linux. so, please, help me on this. thanks in advance.

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  • adding pls to rhythmbox

    - by tomasz74
    I try to add .pls radio station to rhythmbox. I download the file and I click musicimport file but nothing happen. I added one station before and it works fine but now it simply does not work. Also when I try to get from the file, click on open with rhythmbox I have the error: Couldn't start playback Problem occurred without error being set. This is a bug in Rhythmbox or GStreamer. I have all medibuntu installed and I have one radio station already playing. I don't know how to proceed from now and what should I check if there is something to fix. Anyone get similar problem? (Ubuntu 12.04 64-bit Gnome3)

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  • Computer won't wake from hibernate

    - by Icoo
    So I have a pretty dumb problem...I accidentaly pressed Hibernate while trying to Restart...since then my computer wont boot into Ubuntu anymore (through normal mode or single user mode - rescue mode that is)...all I get is: mount: mounting /dev on /root/dev failed: No such file or directory mount: mounting /sys/ on root/sys failed: No such file or directory mount: mounting /proc on /root/proc failed: No such file or dirctory Target filesystem doesn't have requested /sbin/init. No init found. Try passing init= boot arg. BusyBox v1.15.3 (Ubuntu 1:1.15.3-1ubuntu5) built-in shell (ash) Enter 'help' for a list of built-in commands. (initramfs) Obviously I tried to fire up the Live CD and run fsck (or e2fsck) from there (or just try to do a Check of /dev/sdb1 my partition via gparted - which is basically the same thing). But it doesn't allow me...both gparted and fsck say that the device is busy (I can't even mount it in the LiveCD to rescue data)...umount /dev/sdb1 says its not mounted...any ideas?

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  • Vector reflect problem

    - by xdevel2000
    I'm testing some vector reflection and I want to check what happens when a ball collides with a paddle. So if I have: Vector2 velocity = new Vector2(-5, 2); position_ball += velocity; if (position_ball.X < 10) { Vector2 v = new Vector2(1,0); // or Vector2.UnitX velocity = Vector2.Reflect(velocity, v); } then, correctly, velocity is (5,2) after Reflect, but if I do: if (position_ball.X < 10) { Vector2 v = new Vector2(1,1); velocity = Vector2.Reflect(velocity, v); } then velocity is (1,8) and not (5, -2) that is the solution of reflection equation R = V - 2 * (V . N) Why is that?

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  • Global Adopt a JSR Program Update

    - by heathervc
    The Global Adopt a JSR program, combining efforts of SouJava and London Java Community,  is an excellent place to get some Java User Group (JUG) resources for JSRs.  It also has the potential to act as an extra set of eyes, ears and volunteers for JSRs. The Global project to go to is at: http://adoptajsr.java.net.  The wiki page explaining the whole program and benefits to Spec Leads and EG's can be found there, including: The mailing list: [email protected] . Portugese speakers-mainly Brazlian JUG members-have their own mailing list and more language lists may be added as required. The IRC channel is at adoptajsr on irc.freenode.net Also check out this InfoQ article with Martijn Verburg about the London Java user group, the Adopt a JSR program, the JCP and Oracle’s handling of the Java community.

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  • New Layout Features In ASP.NET and WinForms Scheduler Reporting - v2010.1

    Check out these 2 new features of the ASPxScheduler and XtraScheduler that helps you improve appointment layout and display. Quick recap: Our Scheduler controls use the powerful XtraReports Suite for exporting and printing. This gives you added benefits for more flexibility, control and features. Read the 'ASP.NET Calendar SchedulingNew DevExpress Reporting Integration' post to learn more. CanShrink And CanGrow The 2 new layout properties are called CanShrink and CanGrow: CanShrink...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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  • Dynamic Components

    - by Alex
    I am attempting to design a component-based architecture that allows Components to be dynamically enabled and disabled, much like the system employed by Unity3D. For example, all Components are implicitly enabled by default; however, if one desires to halt execution of code for a particular Component, one can disable it. Naively, I want to have a boolean flag in Component (which is an abstract class), and somehow serialize all method calls into strings, so that some sort of ComponentManager can check if a given Component is enabled/disabled before processing a method call on it. However, this is a pretty bad solution. I feel like I should employ some variation of the state paradigm, but I have yet to make progress. Any help would be greatly appreciated,

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  • Ask The Readers: How Do You Find Your Next Game?

    - by Jason Fitzpatrick
    Once upon a time the only place for new video game information was down at the arcade. These days there’s a news source and niche for everyone and every kind of game; where and how do you find your next video game conquest? Word of mouth? App recommendations? Critical reviews? This week we’re interested in lining ourselves up for a little summer fun: tell us all about your tips, tricks, and techniques for finding the real gems in the pile of games that comes out every year. Sound off in the comments and then check back in on Friday for the What You Said roundup. HTG Explains: What Is Two-Factor Authentication and Should I Be Using It? HTG Explains: What Is Windows RT and What Does It Mean To Me? HTG Explains: How Windows 8′s Secure Boot Feature Works & What It Means for Linux

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  • Handling hitboxes

    - by TheBroodian
    So I have an issue that I'm laughing at myself about, because it really seems like it should be something that I should be able to figure out pretty quickly. I am designing a 2D action platformer; I have a playable character, and a dummy 'punching bag' character for testing purposes that I've created. I've just gotten enough of both of them done that I can start prototyping and testing them in runtime. Then I realized- neither of them have references of each other (intentionally so), so how do I check for hitboxes stored within my playable character from my dummy character? Long story short, how do I make my dummy know when he's been punched by my hero?

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  • Can't copy file (I/O error) Ubuntu Server

    - by QxQ
    I'm running Ubuntu Server 12.04, and basically found out that a couple of files aren't behaving like they should. The file name is r.-1.-1.mca, and I've tried using this terminal command sudo cp r.-1.-1.mca ../ The hard drive is working/thinking for a while, then spits this back out: cp: reading `r.-1.-1.mca': Input/output error cp: failed to extend `../r.-1.-1.mca': Input/output error I have another file behaving like this. My guess is that these files are corrupt, so I tried running the server in recovery mode and it told me to check the file system. However, it didn't come up with any errors. Is there a way to repair these files so I can use them normally again?

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