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  • How to implement Session timeout in Web Server Side?

    - by Morgan Cheng
    I beheld a web framework implementing in-memory session in this way. The session object is added to Cache with timeout. When the time is out, the session is removed from Cache automatically. To protect race condition, each request should acquire lock on given session object to proceed. Each request will "touch" the session in Cache to refresh the timeout. Everything looks fine, until this scenario is discovered. Say, one operation takes a long time, longer than timeout. Another request comes and wait on session lock which is currently hold by the long-time request. Finally, the long-time request is over, it releases the lock. But, since it already takes longer time than timeout, the session object is already removed from Cache. This is obvious because the only request holding the lock doesn't have a chance to "touch" the session object in cache. The second request gets the lock but cannot retrieve the expired Session object. Oops... To fix this issue, the second request has to re-create the Session object. But, this is just like digging a buried dead body from tomb and try to bring it back to life. It causes buggy code. I'm wondering what's the best way to implement timeout in session to handle such scenario. I know that current platform must have good session mechanism. I just want to know the under-the-hood how.

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  • How do languages handle side effects of compound operators?

    - by Kos
    Hello, Assume such situation: int a = (--t)*(t-2); int b = (t/=a)+t; In C and C++ this is undefined behaviour, as described here: Undefined Behavior and Sequence Points However, how does this situation look in: JavaScript, Java, PHP... C# well, any other language which has compound operators? I'm bugfixing a Javascript - C++ port right now in which this got unnoticed in many places. I'd like to know how other languages generally handle this... Leaving the order undefined is somehow specific to C and C++, isn't it?

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  • To be effective on your home projects is it better using the same technologies used at work?

    - by systempuntoout
    To be more productive and effective, is it better to start developing an home project using the same technologies used at work? I'm not talking about a simple hello world web page but an home project with all bells and whistles that one day, maybe, you could sell on internet. This dilemma is often subject of flames between me and a friend. He thinks that if you want to make a great home-made project you need to use the same technologies used daily at work staying in the same scope too; for example, a c++ computer game programmer should develope an home-made c++ game. I'm pretty sure that developing using the same technologies used at work can be more productive at beginning, but surely less exciting and stimulating of working with other languages\ides\libraries out of your daily job. What's your opinion about that?

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  • rails server side to upload file from jquery-html5-upload?

    - by Mr_Nizzle
    I'm trying to use this plugin: jquery-html5-upload http://plugins.jquery.com/project/jquery-html5-upload and it's working but i don't know how to get the file and save it on the server on the rails action. in my rails log i just get this: ... 7?\021\b\000\034\000%\003\001\021\000\002\021\001\003\021\001\377?\e\000\000\001\005\001\001\000\000\000\000\000\000\000\000\000\000\000\003\001\002\004\005\006\000\a\377?2\020\000\001\002\002\b\005\002\004\a\000\000\000\000\000\000\000\001\002\003\004\021\000\005\022\023\024!\"1\006\#$2A\aQ\026ar?3BCR\201\243\261\377?\030\001\001\001\001\001\001\000\000\000\000\000\000\000\000\000\000\000\000\002\001\004\005\377?!\021\001\000\001\003\003\005\001\000\000\000\000\000\000\000\000\000\000\021\001\002\ ... i don't really know how to get the file and save it on the server. thx.

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  • Javascript Call function serverside

    - by Dusty
    I need to call a Javascript function from the server side in Client side. I looked and didn't find any way how to do it. I looked also over AJAX but can't figure it out. I am using ASP ( clasic) not .net . I need to call the function in client-side with a variable that comes from the client-side. Please help me!!! Thanks a million !!! I am using a FlashMovies that is sending a value to a Javascript function through ExternalInterface class. The function in javascript receiving it is gAnswer(result) and in this function i would need to have something like : Server side: function saveResult(result) {code to be saved on the server goes here } Client side : function gAnswer (result) { saveResult(result) } <- THis is the part i dont know how to do. The function gAnswer is being called when the flash movie finished by itself. Would you be able to provide some code on how to ? thanks to each one of you who helped me =)

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  • is it possible to turn off vdso on glibc side?

    - by heroxbd
    I am aware that passing vdso=0 to kernel can turn this feature off, and that the dynamic linker in glibc can automatic detect and use vdso feature from kernel. Here I met with this problem. There is a RHEL 5.6 box (kernel 2.6.18-238.el5) in my institution where I only have a normal user access, probably suffering from RHEL bug 673616. As I compile a toolchain of linux-headers-3.9/gcc-4.7.2/glibc-2.17/binutils-2.23 on top of it, gcc bootstrap fails in cc1 in stage2 cannnot be run Program received signal SIGSEGV, Segmentation fault. 0x00002aaaaaaca6eb in ?? () (gdb) info sharedlibrary From To Syms Read Shared Object Library 0x00002aaaaaaabba0 0x00002aaaaaac3249 Yes (*) /home/benda/gnto/lib64/ld-linux-x86-64.so.2 0x00002aaaaacd29b0 0x00002aaaaace2480 Yes (*) /home/benda/gnto/usr/lib/libmpc.so.3 0x00002aaaaaef2cd0 0x00002aaaaaf36c08 Yes (*) /home/benda/gnto/usr/lib/libmpfr.so.4 0x00002aaaab14f280 0x00002aaaab19b658 Yes (*) /home/benda/gnto/usr/lib/libgmp.so.10 0x00002aaaab3b3060 0x00002aaaab3b3b50 Yes (*) /home/benda/gnto/lib/libdl.so.2 0x00002aaaab5b87b0 0x00002aaaab5c4bb0 Yes (*) /home/benda/gnto/usr/lib/libz.so.1 0x00002aaaab7d0e70 0x00002aaaab80f62c Yes (*) /home/benda/gnto/lib/libm.so.6 0x00002aaaaba70d40 0x00002aaaabb81aec Yes (*) /home/benda/gnto/lib/libc.so.6 (*): Shared library is missing debugging information. and a simple program #include <sys/time.h> #include <stdio.h> int main () { struct timeval tim; gettimeofday(&tim, NULL); return 0; } get segment fault in the same way if compiled against glibc-2.17 and xgcc from stage1. Both cc1 and the test program can be run on another running RHEL 5.5 (kernel 2.6.18-194.26.1.el5) with gcc-4.7.2/glibc-2.17/binutils-2.23 as normal user. I cannot simply upgrade the box to a newer RHEL version, nor could I turn VDSO off via sysctl or proc. The question is, is there a way to compile glibc so that it turns off VDSO unconditionally?

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  • How to implement "circular side-scrolling" in my game?

    - by Mr.Gando
    I'm developing a game, a big part of this game, is about scrolling a "circular" background ( the right end of the Background Image can connect with the left start of the Background image ). Should be something like this: ( Entity moving and arrow to show where the background should start to repeat ) This happens in order to allow to have an Entity walking, and the background repeating itself over and over again. I'm not working with tile-maps, the background is a simple Texture (400x300 px). Could anyone point me to a link , or tell me the best way I could accomplish this ? Thanks a lot.

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  • Running Network Application on port Server side give me error how can i solve it?

    - by Phsika
    if i run Server App. Exception occurs: on Dinle.Start() System.Net.SocketException - Only one usage of each socket address (protocol/network address/port) is normally permitted How can i solve this error? Server.cs using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Windows.Forms; using System.IO; using System.Net; using System.Net.Sockets; using System.Threading; namespace Server { public partial class Server : Form { Thread kanal; public Server() { InitializeComponent(); try { kanal = new Thread(new ThreadStart(Dinle)); kanal.Start(); kanal.Priority = ThreadPriority.Normal; this.Text = "Kanla Çalisti"; } catch (Exception ex) { this.Text = "kanal çalismadi"; MessageBox.Show("hata:" + ex.ToString()); kanal.Abort(); throw; } } private void Server_Load(object sender, EventArgs e) { Dinle(); } private void btn_Listen_Click(object sender, EventArgs e) { Dinle(); } void Dinle() { // IPAddress localAddr = IPAddress.Parse("localhost"); // TcpListener server = new TcpListener(port); // server = new TcpListener(localAddr, port); //TcpListener Dinle = new TcpListener(localAddr,51124); TcpListener Dinle = new TcpListener(51124); try { while (true) { Dinle.Start(); Exception is occured. Socket Baglanti = Dinle.AcceptSocket(); if (!Baglanti.Connected) { MessageBox.Show("Baglanti Yok"); } else { TcpClient tcpClient = Dinle.AcceptTcpClient(); if (tcpClient.ReceiveBufferSize 0) { byte[] Dizi = new byte[250000]; Baglanti.Receive(Dizi, Dizi.Length, 0); string Yol; saveFileDialog1.Title = "Dosyayi kaydet"; saveFileDialog1.ShowDialog(); Yol = saveFileDialog1.FileName; FileStream Dosya = new FileStream(Yol, FileMode.Create); Dosya.Write(Dizi, 0, Dizi.Length - 20); Dosya.Close(); listBox1.Items.Add("dosya indirildi"); listBox1.Items.Add("Dosya Boyutu=" + Dizi.Length.ToString()); listBox1.Items.Add("Indirilme Tarihi=" + DateTime.Now); listBox1.Items.Add("--------------------------------"); } } } } catch (Exception ex) { MessageBox.Show("hata:" + ex.ToString()); } } } }

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  • Adding UIComponent to both Canvas and Tree in Flex 3

    - by Chris M
    I currently am trying to add a custom class which subclasses UIComponent to both a tree and a canvas, but when I try to re-order the tree by dragging I get this error: TypeError: Error #1010: A term is undefined and has no properties. at mx.controls::Tree/get firstVisibleItem()[C:\autobuild\3.2.0\frameworks\projects\framework\src\mx\controls\Tree.as:764] at flash.utils::ByteArray/writeObject() at flash.desktop::Clipboard/putSerialization() at flash.desktop::Clipboard/convertFlashFormat() at flash.desktop::Clipboard/setData() at mx.managers::NativeDragManagerImpl/doDrag()[C:\autobuild\3.2.0\frameworks\projects\airframework\src\mx\managers\NativeDragManagerImpl.as:282] at mx.managers::DragManager$/doDrag()[C:\autobuild\3.2.0\frameworks\projects\framework\src\mx\managers\DragManager.as:243] at mx.controls.listClasses::ListBase/dragStartHandler()[C:\autobuild\3.2.0\frameworks\projects\framework\src\mx\controls\listClasses\ListBase.as:9085] at flash.events::EventDispatcher/dispatchEventFunction() at flash.events::EventDispatcher/dispatchEvent() at mx.core::UIComponent/dispatchEvent()[C:\autobuild\3.2.0\frameworks\projects\framework\src\mx\core\UIComponent.as:9298] at mx.controls.listClasses::ListBase/mouseMoveHandler()[C:\autobuild\3.2.0\frameworks\projects\framework\src\mx\controls\listClasses\ListBase.as:8822] When I do not add the UIComponent to the canvas, this error does not occur, anyone have any knowledge as to why this happens?

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  • Is there a nice XSL stylesheet for client-side DocBook rendering?

    - by Steven Huwig
    I want the DocBook documents in my SVN repository to look nice if someone looks at them in a web browser. I've started to write a CSS stylesheet, but I think that it will have significant limitations -- particularly ones regarding hyperlinks. There is a large body of DocBook XSL stylesheets at the DocBook site , but they don't seem to be appropriate for browser rendering. I don't want to generate static documents and put them into SVN. I want them to be basically readable for other developers without much hassle. I could write my own browser-appropriate XSL stylesheet to convert DocBook to HTML, but it seems like someone else must have already done this. I just don't know where to find it.

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  • Great projects, works, people in intersection of programming and art/music?

    - by jacob
    In a recent question I was introduced to the work of André Michelle, which blew me away. What other great people or works do you know in the fields of art and music? As someone with a love for math/programming and art/music I'd love to know more about people using sophisticated (or not so sophisticated) techniques to produce creative things. The software used can be anything from Max/MSP, Flash to simple C code or Assembler. Pointers to forums, blogs, newsletters and similar are very appreciated as well.

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  • Control within another control in asp.net disables server-side events?

    - by Xaisoft
    I have a control which has a button on it. All the button does is redirect the user to another page. On this control I have another control which just display some stuff, nothing fancy. When I click on the button, it does nothing. When I remove or comment out the other control, the button event works. Is this by design? I am not sure how to fix it or what is causing it. ControlA.ascx contains a button with an event like so: protected void Button1_Click(object sender, EventArgs e) { Response.Redirect("~/Home.aspx"); } ControlA.ascx contains another control inside of it, lets call it ControlB.ascx. The Button1 click event does not fire when ControlB.ascx is in ControlA.ascx, but when I remove it or take it out, Button1 event fires and it goes to Home.aspx. This does not only happen for Button1, if I decide to add a second button and create an event for it, if ControlB is in ControlA, the second button event won't fire either.

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  • How to use Wordpress' http.php in external projects?

    - by NJTechGuy
    I am trying to parse data from a pipe-delimited text file hosted on another server which in turn will be inserted in a database. My host (1and1) disabled allow_url_fopen in php.ini I guess. Error message : Warning: fopen() [function.fopen]: URL file-access is disabled in the server configuration in Code : <? // make sure curl is installed if (function_exists('curl_init')) { // initialize a new curl resource $ch = curl_init(); // set the url to fetch curl_setopt($ch, CURLOPT_URL, 'http://abc.com/data/output.txt'); // don't give me the headers just the content curl_setopt($ch, CURLOPT_HEADER, 0); // return the value instead of printing the response to browser curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); // use a user agent to mimic a browser curl_setopt($ch, CURLOPT_USERAGENT, 'Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.5) Gecko/20041107 Firefox/1.0'); $content = curl_exec($ch); // remember to always close the session and free all resources curl_close($ch); } else { // curl library is not installed so we better use something else } //$contents = fread ($fd,filesize ($filename)); //fclose ($fd); $delimiter = "|"; $splitcontents = explode($delimiter, $contents); $counter = ""; ?> <font color="blue" face="arial" size="4">Complete File Contents</font> <hr> <? echo $contents; ?> <br><br> <font color="blue" face="arial" size="4">Split File Contents</font> <hr> <? foreach ( $splitcontents as $color ) { $counter = $counter+1; echo "<b>Split $counter: </b> $colorn<br>"; } ?> Wordpress has this cool http.php file. Is there a better way of doing it? If not, how do I use http.php for this task? Thank you guys..

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  • In ASP.NET MVC, what is the equivalent of ASP classic's server side includes?

    - by Quakkels
    I have been developing in classic ASP for about 2.5 years and I am trying to update my skill set to include ASP.NET MVC. What is the MVC way of executing SSIs? IE: How can I include a database drawn navigation list in a sidebar? I have been looking into partial views, but they seem to get their content from the controller. As far as I can tell this means that I would need to write each controller to pass the navigation list. Am I thinking along the right lines?

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  • How to setup Continuous Integration and Continuous Deployment for Django projects?

    - by ycseattle
    Hello, I am researching about how to set up CI and continuous deployment for a small team project for a Django based web application. Here are needs: Developer check in the code into a hosted SVN server (unfuddle.com) A CI server detects new checkin, check out the source, build, run functional tests. If tests all passed, deploy the code to the webserver on Amazon EC2. For now, the CI server is also responsible to run the functional tests. I figured out that I can use Husdon as the CI server, use Selenium to run functional tests, and use Fabric to deploy the build to remote web server in Amazon cloud. I am new to Django development and not very familiar with opensource tools. My questions are: I can find some information to integrate hudson with selenium, but I couldn't find much information on how to integrate Fabric to Hudson as well. Is this setup viable? Do you see problems? How do I integrate and deploy database changes? Most likely in the early stage we will change database schema very often with code changes. I used to use Visual Studio and the database project made it very simple to deploy. I wonder if there is "established, well-supported" way to do that. Thanks!!

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  • jqGrid concatinating/building html tag incorrectly

    - by Energetic Pixels
    Please excuse to length of post. But I needed to explain what I am seeing. I have a onSelectRow option that is supposed to build stacked html <li> tags (such as <li>...</li> <li>...</li> <li>...</li> ) up to the number of static xml elements that I am looking at. But my script is concatinating all the image src links together instead of building the whole listobject tag. Everything else in my jqGrid script works with exception of repeated elements inside my xml. onSelectRow: function() { var gsr = $('#searchResults').jqGrid('getGridParam', 'selrow'); if (gsr) { var data = $('#searchResults').jqGrid('getRowData', gsr); $('#thumbs ul').html('<li><a class='thumb' href='' + data.piclocation + '' title='' + data.pictitle + ''><img src='" + data.picthumb + "' alt='" + data.pictitle + "' /></a><div class='caption'><div class='image-title'>" + data.pictitle + "</div></div></li>"); };" my xml file is something like this: <photo> <pic> <asset>weaponLib/stillMedia/slides/A106.jpg</asset> <thumb>weaponLib/stillMedia/thumbs/A106.jpg</thumb> <caption>Side view of DODIC A106</caption> <title>Side view of 22 caliber long rifle ball cartridge</title> </pic> <pic> <asset>weaponLib/stillMedia/slides/A106_A.jpg</asset> <thumb>weaponLib/stillMedia/thumbs/A106_A.jpg</thumb> <caption>Side view of DODIC A106</caption> <title>Side view of 22 caliber long rifle ball cartridge</title> </pic> <pic> <asset>weaponLib/stillMedia/slides/A106_B.jpg</asset> <thumb>weaponLib/stillMedia/thumbs/A106_B.jpg</thumb> <caption>Side view of DODIC A106</caption> <title>Side view of 22 caliber long rifle ball cartridge</title> </pic> <pic> <asset>weaponLib/stillMedia/slides/A106_C.jpg</asset> <thumb>weaponLib/stillMedia/thumbs/A106_C.jpg</thumb> <caption>Side view of DODIC A106</caption> <title>Side view of 22 caliber long rifle ball cartridge</title> </pic> <pic> <asset>weaponLib/stillMedia/slides/A106_D.jpg</asset> <thumb>weaponLib/stillMedia/thumbs/A106_D.jpg</thumb> <caption>Side view of DODIC A106</caption> <title>Side view of 22 caliber long rifle ball cartridge</title> </pic> My script works fine when it only sees one sequence, but when it sees more than one it puts all html inside the tags together then for the caption and title does the same for them. It generates only one <li></li> tag set instead of 5 in the example above like I want. The <li> tags are being used by a slideshow (with thumbnails) utility. Inside firebug, I can see the object that it is built for me: <a title="Side view of 22 caliber long rifle ball cartridgeSide view of 22 caliber long rifle ball cartridgeSide view of 22 caliber long rifle ball cartridgeSide view of 22 caliber long rifle ball cartridgeSide view of 22 caliber long rifle ball cartridge" href="weaponLib/stillMedia/slides/A106.jpgweaponLib/stillMedia/slides/A106_A.jpgweaponLib/stillMedia/slides/A106_B.jpgweaponLib/stillMedia/slides/A106_C.jpgweaponLib/stillMedia/slides/A106_D.jpg" class="thumb"><img alt="Side view of 22 caliber long rifle ball cartridgeSide view of 22 caliber long rifle ball cartridgeSide view of 22 caliber long rifle ball cartridgeSide view of 22 caliber long rifle ball cartridgeSide view of 22 caliber long rifle ball cartridge" src="weaponLib/stillMedia/thumbs/A106.jpgweaponLib/stillMedia/thumbs/A106_A.jpgweaponLib/stillMedia/thumbs/A106_B.jpgweaponLib/stillMedia/thumbs/A106_C.jpgweaponLib/stillMedia/thumbs/A106_D.jpg"></a> Within jqGrid, the cell is holding: <td title="weaponLib/stillMedia/slides/A106.jpgweaponLib/stillMedia/slides/A106_A.jpgweaponLib/stillMedia/slides/A106_B.jpgweaponLib/stillMedia/slides/A106_C.jpgweaponLib/stillMedia/slides/A106_D.jpg" style="text-align: center; display: none;" role="gridcell">weaponLib/stillMedia/slides/A106.jpgweaponLib/stillMedia/slides/A106_A.jpgweaponLib/stillMedia/slides/A106_B.jpgweaponLib/stillMedia/slides/A106_C.jpgweaponLib/stillMedia/slides/A106_D.jpg</td> I know that jqGrid is building it wrong. I am double-stumped as to direction to fix it. Any suggestions would be greatly greatly appreciated. tony

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  • How do people handle working with Code Names for their projects?

    - by Mark
    Hi All, Recently we started using some code names for several different types of prototype applications all following a theme. This made things a little more fun and was a great idea. The problem is that Im not too sure how people deal with migrating a codebase from "codename" state into version 1.0 state which may have a proper name... not something that a client really shouldnt see :) We are using Visual Studio at the moment, and I can see that you can change the assembly name, but there are references to the namespaces, etc... that would really be a large change to make. Do people both changing things like namespaces before the v1.0 release?

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  • Assemble an image browser side with JavaScript or Flash?

    - by Kris Walker
    Would it be possible to assemble an image on the browser by 'concatenating' other downloaded images together? The use case is this. The page will display 36 different tiles (small images). The user should be able to arrange those tiles into a 6 x 6 grid and save the resulting grid to disk as an image. The best solution would be to do it all in the browser without Flash. The next best solution would be to allow the user to create the grid in the browser with simple JavaScript drag and drop functionality and then send the coordinates to the server for image processing. The last solution would be to do it all in the browser with Flash. Is it even possible for Flash to create an image and then allow the user to save it from the browser? I am familiar with the Pixastic JavaScript library ( http://www.pixastic.com/ ), but it relies on getting image data to and from a canvas element which is not very well supported. What if I send the tile images to the browser as base64 encoded strings? Could I use JavaScript to create the 6 x 6 grid image? And if so, is there some way of allowing the user to get it onto disk without relying on the canvas element?

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