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  • How to handle recurring execution?

    - by ShaneC
    I am trying to validate the solution I came up for what I think is a fairly typical problem. I have a service running and every 10 minutes it should do something. I've ended up with the following: private bool isRunning = true; public void Execute() { while(isRunning) { if(isRunning) { DoSomething(); m_AutoResetEvent.WaitOne(new Timespan(0, 10, 0)); } } } public void Stop() { isRunning = false; m_AutoResetEvent.Set(); } The immediate potential problems I can see is that I'm not doing any sort of locking around the isRunning modification in Stop() which gets called by another thread but I'm not sure I really need to? The worst that I think could happen is that it runs one extra cycle. Beyond that are there any obvious problems with this code? Is there a better way to solve this problem that I'm unaware of?

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  • How to double the size of 8x8 Grid whilst keeping the relative position of certain tiles intact?

    - by ke3pup
    Hi guys I have grid size of size 8x8 , total of 64 Tiles. i'm using this Grid to implement java search algorithms such as BFS and DFS. The Grid has given forbidden Tiles (meaning they can't be traversed or be neighbour of any other tile) and Goal and Start tile. for example Tile 19,20,21,22 and 35, 39 are forbidden and 14 an 43 are the Goal and start node when the program runs. My question is , How can i double the size of the grid, to 16x16 whilst keeping the Relative position of forbidden tiles as well as the Relative position of start and goal Tiles intact? On paper i know i can do this by adding 4 rows and columns to all size but in coding terms i don't know how to make it work? Can someone please give any sort of hints?

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  • d3 tree - parents having same children

    - by Larry Anderson
    I've been transitioning my code from JIT to D3, and working with the tree layout. I've replicated http://mbostock.github.com/d3/talk/20111018/tree.html with my tree data, but I wanted to do a little more. In my case I will need to create child nodes that merge back to form a parent at a lower level, which I realize is more of a directed graph structure, but would like the tree to accomodate (i.e. notice that common id's between child nodes should merge). So basically a tree that divides like normal on the way from parents to children, but then also has the ability to bring those children nodes together to be parents (sort of an incestual relationship or something :)). Asks something similar - How to layout a non-tree hierarchy with D3 It sounds like I might be able to use hierarchical edge bundling in conjunction with the tree hierarchy layout, but I haven't seen that done. I might be a little off with that though.

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  • jQuery doesn't work after an Ajax post

    - by user1758979
    I'm using jQuery to sort a list of entries, between <LI></LI> tags, and then an Ajax post to validate the order and 'update' the page with the content returned. $.ajax({url: "./test.php?id=<?php echo $id; ?>&action=modify", contenttype: "application/x-www-form-urlencoded;charset=utf-8", data: {myJson: data}, type: 'post', success: function(data) { $('html').html(data); OnloadFunction (); } }); Then, I lose the ability to sort the list (I'm not sure if clear...). I tried to move the content of the $(document).ready inside the OnloadFunction (), and call it with <script>OnloadFunction ();</script> inside the block dealing with the modifications to do : $action= $_GET['action']; if ($action == "modify") { // Code here } but it doesn't work... I can't figure out how to do that. Could anyone help ? I stripped out the main part of the code to keep only the essential (filename: test.php) <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> <script type="text/javascript" src="jquery-1.8.2.min.js"></script> <script type="text/javascript" src="jquery-ui-1.9.0.custom.min.js"></script> <script> $(document).ready(function(){ //alert("I am ready"); OnloadFunction (); }); function OnloadFunction () { $(function() { $("#SortColumn ul").sortable({ opacity: 0.6, cursor: 'move', update: function() {} }); }); //alert('OnloadFunction ends'); } function valider(){ var SortedId = new Array(); SortIdNb = 0; $('#SortColumn ul li').each(function() { SortedId.push(this.id); }); var data = { /* Real code contains an array with the <li> id */ CheckedId: "CheckedId", SortedId: SortedId, }; data = JSON.stringify(data); $.ajax({url: "./test.php?id=<?php echo $id; ?>&action=modify", contenttype: "application/x-www-form-urlencoded;charset=utf-8", data: {myJson: data}, type: 'post', success: function(data) { //alert(data); $('html').html(data); OnloadFunction (); } }); } </script> </head> <body> <? $action= $_GET['action']; $id = $_GET['id']; if ($id == 0) {$id=1;} $id += 1; if ($action == "modify") { echo "action: modify<br>"; echo "id (àvèc aççént$): ".$id."<br>"; // "(àvèc aççént$)" to check characters because character set is incorrect after the ajax post $data = json_decode($_POST['myJson'], true); // PHP code here to treat the new list send via the post and update the database print_r($data); } ?> <!-- PHP code here to get the following list from the database --> <div id="SortColumn"> <ul> <li id="recordsArray_1">recordsArray_1</li> <li id="recordsArray_2">recordsArray_2</li> <li id="recordsArray_3">recordsArray_3</li> <li id="recordsArray_4">recordsArray_4</li> <li id="recordsArray_5">recordsArray_5</li> </ul> </div> <input type="button" value="Modifier" onclick="valider();"> </body> </html>

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  • How do I implement a DataGrid with an MVVM approach.

    - by Fred
    Hi, I'd like to implement a sort of Addressbook/Contactbook using a Datagrid (or a List) and the MVVM pattern. Something like in Outlook/Thunderbird, where you've a list of your contacts displayed with a 2-3 main fields (name surname for example), and when you double-click a contact, then you get a new modal box that displays all the details of this specific contact. Since a couple of weeks/months, I'm reading a lot of stuff about MVVM pattern on the net, but somehow, I get confused. Until now, I could find any sample like this. (perhaps, I searched wrong?) How could I organize such an application? Thx in advance for your help.

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  • Which is the best Linux C/C++ debugger (or front-end to gdb) to help teaching programming?

    - by omer.gimenez
    I teach a sort of "lite" C++ programming course to novices ("lite" meaning no pointers, no classes, just plain old C, plus references and STL string and vectors). Students have no previous experience in programming, so I believe that using an interactive debugger would help them understand program flow, variables, and recursion. The course is taught in Linux. Teaching them to use gdb is just overkill (they will not use nor understand most features). I just need something simple but easy to use: to see at which line the program is now, what is in the stack (local variables, previous calls, etc.). I look something similar to old Turbo Pascal or Turbo C++ Borland's debugger, or Visual Studio debugger. Thank you,

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  • TypeError: Error #1009 Actionscript 3 help.

    - by matt_t
    I am extremely frustrated. I'm following a tutorial and mimicing it on my own. I've been able to sort out most of the errors so far but this one has me stumped. I have tried replacing all of the class files with the tutorial specimen ones but i still get the error. TypeError: Error #1009: Cannot access a property or method of a null object reference. at com.senocular.utils::KeyObject/construct() at com.senocular.utils::KeyObject() at com.asgamer.basics1::Ship() at com.asgamer.basics1::Engine() Now, not really understanding the error properly I paste dumped the files online for you to look at. Ship class: textbin.com/78z35 Engine class: textbin.com/32b24 KeyObject class: textbin.com/p2725 As the error still occured when using the specimen class files I really have no idea where to begin. I will gladly try out any suggestions (although later on, i'm tired now ;). Thanks very much.

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  • Bash: any command to replace strings in text files?

    - by mikez302
    I have a hierarchy of directories containing many text files. I would like to search for a particular text string every time it comes up in one of the files, and replace it with another string. For example, I may want to replace every occurrence of the string "Coke" with "Pepsi". Does anyone know how to do this? I am wondering if there is some sort of Bash command that can do this without having to load all these files in an editor, or come up with a more complex script to do it. I found this page explaining a trick using sed, but it doesn't seem to work in files in subdirectories.

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  • How to fire off a asych thread in a web application, and gaurantee only 1 thread fires?

    - by Blankman
    I want to cache a object in memory. Regenerating the object when the cache expires is fairly expensive, so I want to do the following: When the cache is "about" to expire, I want to fire off a asychronous thread that will go and rebuild the object and then reset the cache. One thing I am worry about is multiple threads firing to fetch the object to cache, I only want a single thread doing this, realizing many people will be hitting the website. This might not be the best use case to do this, but I want to know how to do this sort of thing.

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  • Creating a db driven primary navigation in django?

    - by Fedor
    I find that it's pretty common most people hardcode the navigation into their templates, but I'm dealing with a pretty dynamic news site which might be better off if the primary nav was db driven. So I was thinking of having a Navigation model where each row would be a link. link_id INT primary key link_name varchar(255) url varchar(255) order INT active boolean If anyone's done something similar in the past, would you say this sort of schema is good enough? I also wanted for there to be an optional dropdown in the admin near the url field so that a user could choose a Category model's slug since category links would be common, but I'm not quite sure how that would be possible.

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  • How to enforce a site-wide license?

    - by Roy Tang
    We have a small .Net program that we sell with individual licenses. The individual licenses are enforced by registering a key file that is generated using information from the machine used to install the program (MAC address, etc.) Now, we have a customer request for a site-wide license, such that they can deploy to as many machines on their site as possible. From the technical POV I'm not sure what are the usual approaches for this; our old approach won't work since we can't map the license to any machine-specific information. Any suggestions? A few more details: the program is a client-side program that includes an Office Add-In the machines to be installed on may or may not have internet access we aren't restricted to .Net-only approaches, I'm just looking for a general idea of how this sort of thing is usually handled

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  • help regarding PERL program

    - by riya
    Could someone write simple PERL programs for the following scenarios: 1) convert a list from {1,2,3,4,5,7,9,10,11,12,34} to {1-5,7,9-12,34} 2) to sort a list of negative numbers 3) to insert values to hash array 4) there is a file with content: C1 c2 c3 c4 r1 r2 r3 r4 put it into an hash array where keys = {c1,c2,c3,c4} and values = {r1,r2,r3,r4} 5) There are testcases running each testcase runs as a process and has a process ID. The logs are logged in a logfile process ID appended to each line. Prog to find out if the test case has passed or failed. The program shoud be running till the processes are running and display output.

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  • Trust metrics and related algorithms

    - by Nick Gerakines
    I'm trying to learn more about trust metrics (including related algorithms) and how user voting, ranking and rating systems can be wired to stiffle abuse. I've read abstract articles and papers describing trust metrics but haven't seen any actual implementations. My goal is to create a system that allows users to vote on other users and the content of other users and with those votes and related meta-data, determine if those votes can be applied to a users level or popularity. Have you used or seen some sort of trust system within a social graph? How did it work and what were its areas of strength and weaknesses?

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  • best way to build iphone settings screen

    - by Christian Schlensker
    I'm building a settings screen for an iPhone app and it is supposed to resemble a grouped table view. Each "cell" should behave like a button. Most cells just have a image view, label view, and disclosure indicator. One will display a value in addition to a label. All of these buttons will present a new view when tapped. Now, how to implement this? I was considering just laying out a set of buttons with custom background images, or would it be best to just use a table view. If that's the case what should it be implemented. So far I've only used table views to display some kind of dynamic data in which each cell displayed the same basic detail view. I'm most curious to figure out how to setup cellForRowAtIndexPath. Would this contain some sort of switch statement to configure each cell individually, or is there an easier way to handle all this?

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  • Linq To SQL: Retain list order when using .Contains

    - by rockinthesixstring
    I'm using Lucene.net to build a MyListOfIds As List(Of Integer) which I then pass on to my Linq service. I then search the database as follows Return _EventRepository.Read().Where(Function(e) MyListOfIds.Contains(e.ID)).ToList Now I know that Lucene is already ordering MyListOfIds based on the weight it gave each term. What sucks is that Linq is losing that order in it's SQL search. My Question: How can I retain that sort order when building my Lambda expression? I tried using LINQPad to see how the query is being built, but because I had to declare a variable LINQPad didn't show me the resultant SQL :-( Here's what I tried in LINQPad Dim i As New List(Of Integer) i.Add(1) i.Add(100) i.Add(15) i.Add(3) i.Add(123) Dim r = (From e In Events Where i.Contains(e.ID) Select e) note: my example is in VB.NET, but I don't mind if responses are in C#

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  • JQuery UI Tabs widget error handling

    - by dthrasher
    When an ajax request fails, the JQuery UI Tabs widget stops responding and the "Loading..." spinner remains on the tab that caused the error. I can get the ajax callback to give me some sort of alert message like so: $('#localtabs > ul').tabs({ ajaxOptions: { success: tabLoadSuccessCallback, error: tabLoadFailureCallback} }); function tabLoadSuccessCallback(XMLHttpRequest, textStatus, errorThrown) { alert("Yay!");} function tabLoadFailureCallback(XMLHttpRequest, textStatus, errorThrown) { alert("Could not get search results.");} But what I'd really like is to be able to display a message within the panel, cancel the spinner, and disable the tab that caused the problem while leaving the rest of the tabs operational. Does anyone have any ideas for how to do this?

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  • Drupal Views limiting content posted by group membership

    - by digital
    Hi, I have various different content types and I want to filter by using views. So say a block only displays content posted in groups that you are a member of. I've created my generic view which so far displays all content of that type, but I'm struggling with linking this to content only posted in groups your a member of. I've looked at the Organic Groups filters but no luck there. I suspect I might need to use some sort of relationship but I'm stuck there. Any help would be greatly appreciated.

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  • How to communicate with Telecom infrastructure using .NET

    - by Raiford
    I am currently writing some pretty gnarly C#/C++/Cli code to interface with Telecommunication equipement and GSM Mobile Networks for a couple of the major telecom here and abroad. GSM networks primarily use SS7 Signaling using a protocol called TCAP to send messages back and forth to Signaling Points within the network. The laws of Tcp/ip do not apply here :) I am very interested in hearing from others in this space specifically individuals using the .NET framework most likely using C# / C++. I have not come across any .NET libraries or tools to assist in this sort of development. Most of the software in this industry is "C" / Java based, as a result I have written tons of infrastructure .NET code using C# where possible and C++ / CLI to interface with hardware. Is anyone aware of any .NET language tools for this niche industry?

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  • how to debug a query that has valid syntax, executes, but returns no results?

    - by Ty W
    So I'm writing a fairly involved query with a half dozen joins, a dependent subquery for [greatest-n-per-group] purposes, grouping, etc. It is syntactically valid, but I've clearly made at least one mistake because it returns nothing. In the past I've debugged valid queries that return nothing by removing joins, executing subqueries on their own, removing WHERE conditions, and removing grouping to see what I would get but so far this one has me stumped. Are there better tools or techniques to use for this sort of thing? This particular query is for MySQL if it matters for any platform-specific tools.

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  • Working with multiple jQuery libraries and Prototype.

    - by Derek
    Ok, i saw some other posts about this sort of thing, but not exactly related. This is not what I want to do, but need to do unfortunately. We have in this order right now Prototype 1.6 jQuery 1.2.6 with noConflict on jQuery with j I need to add jQuery 1.4.2 in that mix as well. It will always be the last one loaded. No option. Is there anyway i can do this currently? I know this is not good, yada, yada, but it has to be done for now unfortunately. Thanks, Derek

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  • Send custom data when initializing java WebService over soap

    - by Mesni
    Hello. I have a question about sending additional data over soap to the functions. My webService function requests only one integer, for example an getDocumentPrivilage(DocumentID). In another WebService user registered and he got an unique ID, so the other application can see who he is. So on Service one he registers, gets id and it has to send it to the other webservice tor the privilage. Id dont wish to rewrite the function so that it gets the unique ID (like this getDocumentPrivilage(uniqID,DocumentID)) but, the wish is that i would be able to create a client that sends this data at the initialization or somehow as some sort of parameter behind the function. Is this possible?? I tried the ServiceLifecycle but cant see any setting i've given in. Im using WebSphere CE for the server and Jax-ws Creating the webapp in java. Thank you very much in advance. lp, Mesni

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  • SQL Server missing tables and stored procedures

    - by Robo
    I have an application on a client's site that processes data each night, last night SQL Server 2005 gave the error "Could not find stored procedure 'xxxx'". The stored procedure does exist in the database, has the right permission as far as I can tell, the application runs fine in other nights as well. In previous occasions, the SQL Server has also gave error saying 'database object not found', and refers to a table in the database that does exists. So, on rare occasions, the server thinks certain stored procedures and tables does not exist in the database. The objects it refers to are often ones that are frequently used. Is the database somehow corrupted, is there some sort of repair/health check I can do?

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  • Why Do Programmers Get So Invested in their Favorite Technologies?

    - by Pierreten
    I've noticed this culture surrounding Ruby where developers truly believe that they are somehow more gifted than developers of other languages, regardless of experience and talent (even when that isn't the case, I've met some extremely junior Ruby developers come up with some pretty basic constructs, and pass them off as some sort of revolutionary idea). The derision of strongly typed languages seems to be a common theme as well; regardless of its merits. Is there something particular to the Ruby syntax in general that is to account for this? Is there a sociological component to it?

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  • arboroaks.net/lakelandhills verse lakelandhillsatarboroaks.com , which is best for SEO?

    - by Roeland
    I am trying to decide what is the best way to approach a site I built with SEO in mind. The site has a parent site (sort of a splash page) (arboroaks.net) and the 3 children sites. Parent site is one page, and each of the 3 child sites is about 8-10pages. Right now I have the 3 child sites set up as folders under arboroaks.net. For example, lakelandhills, a child site, would be arboroaks.net/lakelandhills. I have the full domain, arboroaksatlakelandhills.com redirect to this url (arboroaks.net/lakelandhills). My question is whether I should have the child sites be contained on their own domain or not. Think lakelandhillsatarboroaks.com/about-us.php verse arboroaks.net/lakelandhills/about-us.php. The main reason is obviously for SEO consideration. Thanks!

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  • I've got to update a column in one SQL table with a counter stored in another table, and update that

    - by Bucket
    I'm using SQL server 2005 (for testing) & 2007 (for production). I have to add a unique record ID to all the records in my table, in an existing column, using a "last record ID" column from another table. So, I'm going to do some sort of UPDATE of my table, but I have to get the "last record ID" from the other table, increment it, update THAT table and then update my record. Can anyone give me an example of how to do this? Other users may be incrementing the counter also.

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