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  • How do I dynamically update an instance array to hold a list of dynamic methods on instantiation?

    - by Will
    I am trying to dynamically define methods based on xml mappings. This works really well. However I want to create an instance variable that is a array of the dynamically defined methods. My code looks something like this def xml_attr_reader(*args) xml_list = "" args.each do |arg| string_val = "def #{arg}; " + " xml_mapping.#{arg}; " + "end; " self.class_eval string_val xml_hash = xml_list + "'#{arg}'," end self.class_eval "@xml_attributes = [] if @xml_attributes.nil?;" + "@xml_attributes = @xml_attributes + [#{xml_list}];" + "puts 'xml_attrs = ' + @xml_attributes.to_s;" + "def xml_attributes;" + " puts 'xml_attrs = ' + @xml_attributes.to_s;" + " @xml_attributes;" + "end" end So everything works except when I call xml_attributes on an instance it return null (and prints out 'xml_attrs = '). While the puts before the definition actually prints out the correct array. (when I instantiate the instance)

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  • What are the general strategies for the server of an FPS multiplayer game to update its clients?

    - by Hooray Im Helping
    A friend and I were having a discussion about how a FPS server updates the clients connected to it. We watched a video of a guy cheating in Battlefield: Bad Company 2 and saw how it highlighted the position of enemies on the screen and it got us thinking. His contention was that the server only updates the client with information that is immediately relevant to the client. I.e. the server won't send information about enemy players if they are too far away from the client or out of the client's line of sight for reasons of efficiency. He was unsure though - he brought up the example of someone hiding behind a rock, not able to see anyone. If the player were suddenly to pop up where he had three players in his line of sight, there would be a 50ms delay before they were rendered on his screen while the server transmitted the necessary information. My contention was the opposite: that the server sends the client all the information about every player and lets the client sort out what is allowed and what isn't. I figured it would actually be less expensive computationally for the server to just send everything to the client and let the client do the heavy lifting, so to speak. I also figured this is how cheat programs work - they intercept the server packets, get the location of enemies, then show them on the client's view. So the question: What are some general policies or strategies a modern first person shooter server employs to keep its clients updated?

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  • Update on: How to model random non-overlapping spheres of non-uniform size in a cube using Matlab?

    - by user3838079
    I am trying to use MATLAB for generating random locations for non-uniform size spheres (non-overlapping) in a cube. The for loop in the code below never seems to end. I don't know what am missing in the code. I have ran the code for no. of spheres (n) = 10; dims = [ 10 10 10 ] function [ c r ] = randomSphere( dims ) % creating one sphere at random inside [0..dims(1)]x[0..dims(2)]x... % radius and center coordinates are sampled from a uniform distribution % over the relevant domain. % output: c - center of sphere (vector cx, cy,... ) % r - radius of sphere (scalar) r = rand(1); % you might want to scale this w.r.t dims or other consideration c = r + rand( size(dims) )./( dims - 2*r ); % make sure sphere does not exceed boundaries function ovlp = nonOverlapping( centers, rads ) % check if several spheres with centers and rads overlap or not ovlp = false; if numel( rads ) == 1 return; % nothing to check for a single sphere end dst = sqrt( sum( bsxfun( @minus, permute( centers, [1 3 2] ),... permute( centers, [3 1 2] ) ).^2, 3) ); ovlp = dst >= bsxfun( @plus, rads, rads.' ); %' all distances must be smaller than r1+r2 ovlp = any( ovlp(:) ); % all must not overlap function [centers rads] = sampleSpheres( dims, n ) % dims is assumed to be a row vector of size 1-by-ndim % preallocate ndim = numel(dims); centers = zeros( n, ndim ); rads = zeros( n, 1 ); ii = 1; while ii <= n [centers(ii,:), rads(ii) ] = randomSphere( dims ); if nonOverlapping( centers(1:ii,:), rads(1:ii) ) ii = ii + 1; % accept and move on end end

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  • In WPF, how do I update the object that my custom property is bound to?

    - by Timothy Khouri
    I have a custom property that works perfectly, except when it's bound to an object. The reason is that once the following code is executed: base.SetValue(ValueProperty, value); ... then my control is no longer bound. I know this because calling: base.GetBindingExpression(ValueProperty); ... returns the binding object perfectly - UNTIL I call base.SetValue. So my question is, how do I pass the new "value" on to the object that I'm bound to?

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  • How to update to jersey 2.X on an app using jersey 1.1X?

    - by Maxrunner
    i recently faced a problem with the handling of exceptions using jersey. In this case it was that the exceptions thrown from Exception mapper are not re thrown to the underlaying container, i searched and found that this has been fixed in the 2.0 version. But i'm using jersey 1.10 and the 2.X dependencies are all different and its also maven based. Since this project is not using maven, how do i use the more recent version?In the 2.X versions there are no jackson json jars for example. So i'm having some doubts in how to upgrade. Here's my web.xml config entry for jerse <servlet> <servlet-name>Jersey REST Service</servlet-name> <servlet-class>com.sun.jersey.spi.container.servlet.ServletContainer</servlet-class> <init-param> <param-name>com.sun.jersey.config.property.packages</param-name> <param-value>com.mobile.rest.resources</param-value> </init-param> <init-param> <param-name>com.sun.jersey.api.json.POJOMappingFeature</param-name> <param-value>true</param-value> </init-param> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>Jersey REST Service</servlet-name> <url-pattern>/rest/*</url-pattern> </servlet-mapping> regards,

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  • Are there any frameworks for data subscription and update?

    - by Timothy Pratley
    There is one server with multiple clients. The clients are viewing subsets of the servers entire data. If the data that a client is viewing changes, the client should be informed of the changes so that it displays the current data. Example: Two clients are viewing a list of users in an administration screen. One client adds a new user to the list and modifies the permissions of another user. The other client sees the changes propagated to their view.

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  • how to effectively keep/update postal and telephone code format for each country?

    - by melaos
    hi there, currently we have a table for regex format for phone and postal code for countries that we use to validate when the user register through our forms. but the problem remains on the maintenance on the correctness of these format, thus what's a good way to ensure that we always have the latest copy of this information? is there a web service/etc that i can use to get this? or does it even make sense to keep all these format but instead use a relaxed method to ensure that the user just keys in something which roughly matches the format? the information is used solely for shipping and billing address. we're using asp.net 2.0 btw. thanks ~steve

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  • Setting Image.Source doesn't update when loading from a resource.

    - by ChrisF
    I've got this definition in my XAML: <Image Name="AlbumArt" Source="/AlbumChooser2;component/Resources/help.png" /> The image is display OK on startup. In my code I'm looking for mp3's to play and I display the associated album art in this Image. Now if there's no associated image I want to display a "no image" image. So I've got one defined and I load it using: BitmapImage noImage = new BitmapImage( new Uri("/AlbumChooser2;component/Resources/no_image.png", UriKind.Relative)); I've got a helper class that finds the image if there is one (returning it as a BitmapImage), or returns null if there isn't one: if (findImage.Image != null) { this.AlbumArt.Source = findImage.Image; // This works } else { this.AlbumArt.Source = noImage; // This doesn't work } In the case where an image is found the source is updated and the album art gets displayed. In the case where an image isn't found I don't get anything displayed - just a blank. I don't think that it's the setting of AlbumArt.Source that's wrong, but the loading of the BitmapImage. If I use a different image it works, but if I recreate the image it doesn't work. What could be wrong with the image?

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  • Does anyone know why jquery dialog is showing stale content on ajax update ?

    - by oo
    I have a series of links and when i click on a link i want to show a dialog with detail information. This detail is returned from an jquery ajax request. I am using the following code below to show a partial result through ajax onto a jquery dialog. Here is the jquery code: $(document).ready(function() { $('a.click').live('click', function() { var url = '/Tracker/Info?id=' + $(this).attr("id"); var dialogOpts = { modal: true, bgiframe: true, autoOpen: false, height: 600, width: 450, overlay: { opacity: 0.7, background: "black" }, draggable: true, resizeable: true, open: function() { //display correct dialog content $("#dialogDiv").load(url); } }; $("#dialogDiv").dialog(dialogOpts); //end dialog $("#dialogDiv").dialog("open"); }); }); Here is my controller action code: public ActionResult Info(int id) { return PartialView("LabelPartialView", _Repository.GetItem(id)); } Here is the issue: When i click this the first time (lets say i send id = 1234) it works fine. When i click on another item (lets say i send id = 4567) it shows the content from 1234 still. Which i click this second item again (again its 4567), then it will show the content from 4567. Does anyone know why it might not be refreshed the first time? Is this a timing issue?

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  • Can't update rows in my database using Entity Framework...?

    - by Dissonant
    Okay, this is really weird. I made a simple database with a single table, Customer, which has a single column, Name. From the database I auto-generated an ADO.NET Entity Data Model, and I'm trying to add a new Customer to it like so: using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace Test { class Program { static void Main() { Database1Entities db = new Database1Entities(); Customer c = new Customer(); c.Name = "Harry"; db.AddToCustomer(c); db.SaveChanges(); } } } But it doesn't persist Customer "Harry" to the database! I've been scratching my head for a while now wondering why such a simple operation doesn't work. What on earth could be the problem!?

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  • Why does the BackgroundWorker in WPF need Thread.Sleep to update UI controls?

    - by user364060
    namespace WpfApplication1 { /// <summary> /// Interaction logic for Window1.xaml /// </summary> public partial class Window1 : Window { BackgroundWorker bgWorker; Action<int> myProgressReporter; public Window1() { InitializeComponent(); bgWorker = new BackgroundWorker(); bgWorker.DoWork += bgWorker_Task; bgWorker.RunWorkerCompleted += myWorker_RunWorkerCompleted; // hook event to method bgWorker.ProgressChanged += bgWorker_ReportProgress; // hook the delegate to the method myProgressReporter = updateProgress; bgWorker.WorkerReportsProgress = true; } private void myWorker_RunWorkerCompleted(object sender, System.ComponentModel.RunWorkerCompletedEventArgs e) { object result; result = e.Result; MessageBox.Show(result.ToString()); progressBar1.Value = 0; button1.IsEnabled = true; } private void bgWorker_ReportProgress(object sender, ProgressChangedEventArgs e) { System.Windows.Threading.Dispatcher disp = button1.Dispatcher; disp.BeginInvoke(myProgressReporter,e.ProgressPercentage); //Dispatcher.BeginInvoke(myProgressReporter, DispatcherPriority.Normal, e.ProgressPercentage); } private void updateProgress(int progressPercentage) { progressBar1.Value = progressPercentage; } private void bgWorker_Task(Object sender, DoWorkEventArgs e) { int total = 1000; for (int i = 1; i <= total; i++) { if (bgWorker.WorkerReportsProgress) { int p = (int)(((float)i / (float)total) * 100); bgWorker.ReportProgress(p); } Thread.Sleep(1); // Without Thread.Sleep(x) the main thread freezes or gives stackoverflow exception, } e.Result = "Completed"; } private void button1_Click(object sender, RoutedEventArgs e) { if(!bgWorker.IsBusy) bgWorker.RunWorkerAsync("This is a background process"); button1.IsEnabled = false; } } }

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  • How to update content of one ArrayController from the selected value of another ArrayController in Ember.js

    - by CodeHugger
    I have the following problem in ember.js. A child controller depends on a selected value in a parent controller in order to determine its content. In the database a child has a parent_id reference. App.parentsController = Em.ArrayController.create({ content: [], selected: null }); App.sonsController = Em.ArrayController.create({ // the value of content depends on the id of // the selected item in the parentsController content: [], selected: null }); App.daughtersController = Em.ArrayController.create({ // the value of content depends on the id of // the selected item in the parentsController content: [], selected: null }); I would prefer to solve this without the parentsController having to know anything about the other controllers. This should be possible with observers, bindings or even through calculations but I have no clue where to start. Any help would be well appreciated.

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  • how to get started with TopCoder to update/develop algorithm skills ?

    - by KaluSingh Gabbar
    at workplace, the work I do is hardly near to challenging and doing that I think I might be loosing the skills to look at a completely new problem and think about different ideas to solve it. A friend suggested TopCoder.com to me, but looking at the overwhelming number of problems I can not decide how to get started? what I want is to sharpen my techniques ( not particular language or framework ).

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  • How can I update a Jtextarea once? (mysql side-?)

    - by user1294196
    Ok what I've been trying to do is figure out how to make it so when I press the search button on my program the code that is currently just being printed to the console will print to the text area I have. I can't figure out how to do this and I've searched google and still found no answer. And while I'm at it if anyone could help me figure out how to send this same line of information to a mysql database that would help greatly. package GTE; import java.awt.EventQueue; public class GTE { private JFrame frmGte; public String hashq = "..."; public String twtresults; public int refresh = 1; public static void main(String[] args) { java.awt.EventQueue.invokeLater(new Runnable() { public void run() { try { GTE window = new GTE(); window.frmGte.setVisible(true); } catch (Exception e) {} } }); } /** * Create the application. * @throws IOException * @throws FontFormatException */ public GTE(){ try { initialize(); } catch (FontFormatException e) {} catch (IOException e) {} } /** * Initialize the contents of the frame. * @throws IOException * @throws FontFormatException */ private void initialize() throws FontFormatException, IOException { frmGte = new JFrame(); frmGte.setResizable(false); frmGte.setTitle("GTE"); frmGte.setBounds(100, 100, 450, 390); frmGte.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); GridBagLayout gridBagLayout = new GridBagLayout(); gridBagLayout.columnWidths = new int[]{434, 0}; gridBagLayout.rowHeights = new int[]{21, 0, 0, 0, 0, 0, 0, 0, 0}; gridBagLayout.columnWeights = new double[]{0.0, Double.MIN_VALUE}; gridBagLayout.rowWeights = new double[]{0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, Double.MIN_VALUE}; frmGte.getContentPane().setLayout(gridBagLayout); JLabel GTETitle = new JLabel("Personal Tweet Extractor"); InputStream is = this.getClass().getResourceAsStream("ultraviolentbb_reg.ttf"); Font GTEFont = Font.createFont(Font.TRUETYPE_FONT,is); Font f = GTEFont.deriveFont(24f); GTETitle.setFont(f); GTETitle.setHorizontalAlignment(SwingConstants.CENTER); GridBagConstraints gbc_GTETitle = new GridBagConstraints(); gbc_GTETitle.insets = new Insets(0, 0, 5, 0); gbc_GTETitle.anchor = GridBagConstraints.NORTH; gbc_GTETitle.fill = GridBagConstraints.HORIZONTAL; gbc_GTETitle.gridx = 0; gbc_GTETitle.gridy = 0; frmGte.getContentPane().add(GTETitle, gbc_GTETitle); Label label_2 = new Label("~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~"); GridBagConstraints gbc_label_2 = new GridBagConstraints(); gbc_label_2.insets = new Insets(0, 0, 5, 0); gbc_label_2.gridx = 0; gbc_label_2.gridy = 1; frmGte.getContentPane().add(label_2, gbc_label_2); JLabel SearchTweets = new JLabel("Search For Tweets With" + hashq + ":"); GridBagConstraints gbc_SearchTweets = new GridBagConstraints(); gbc_SearchTweets.insets = new Insets(0, 0, 5, 0); gbc_SearchTweets.gridx = 0; gbc_SearchTweets.gridy = 2; frmGte.getContentPane().add(SearchTweets, gbc_SearchTweets); JLabel label = new JLabel("#"); GridBagConstraints gbc_label = new GridBagConstraints(); gbc_label.insets = new Insets(0, 0, 5, 0); gbc_label.gridx = 0; gbc_label.gridy = 3; frmGte.getContentPane().add(label, gbc_label); JButton Search = new JButton("Start Search"); Search.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent evt) { TS(hashq); GTE.this.refresh = 0; try { nulll dialog = new nulll(); dialog.setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE); dialog.setVisible(true); } catch (Exception e) {} } public void TS(String hashtag){ Twitter twitter = new TwitterFactory().getInstance(); try { System.out.println(hashtag); QueryResult result = twitter.search(new Query("#" + hashtag)); List<Tweet> tweets = result.getTweets(); for (Tweet tweet : tweets) { System.out.println("@" + tweet.getFromUser() + " : " + tweet.getText()); GTE.this.twtresults = ("@" + tweet.getFromUser() + " : " + tweet.getText()); } } catch (TwitterException te) { te.printStackTrace(); System.out.println("Failed to search tweets: " + te.getMessage()); System.exit(-1); } } }); TextField textField = new TextField(); textField.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent evt) { GTE.this.hashq = evt.getActionCommand(); } }); GridBagConstraints gbc_textField = new GridBagConstraints(); gbc_textField.ipadx = 99; gbc_textField.insets = new Insets(0, 0, 5, 0); gbc_textField.gridx = 0; gbc_textField.gridy = 4; frmGte.getContentPane().add(textField, gbc_textField); GridBagConstraints gbc_Search = new GridBagConstraints(); gbc_Search.insets = new Insets(0, 0, 5, 0); gbc_Search.gridx = 0; gbc_Search.gridy = 5; frmGte.getContentPane().add(Search, gbc_Search); Label label_1 = new Label("Search Results For Tweets With"); GridBagConstraints gbc_label_1 = new GridBagConstraints(); gbc_label_1.insets = new Insets(0, 0, 5, 0); gbc_label_1.gridx = 0; gbc_label_1.gridy = 6; frmGte.getContentPane().add(label_1, gbc_label_1); TextArea textArea = new TextArea(); textArea.setText(twtresults); textArea.setEditable(false); GridBagConstraints gbc_textArea = new GridBagConstraints(); gbc_textArea.gridx = 0; gbc_textArea.gridy = 7; frmGte.getContentPane().add(textArea, gbc_textArea); JMenuBar menuBar = new JMenuBar(); frmGte.setJMenuBar(menuBar); JMenu Filemenu = new JMenu("File"); menuBar.add(Filemenu); JMenuItem Exititem = new JMenuItem("Exit"); Exititem.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent evt) { System.exit(0); } }); Filemenu.add(Exititem); JMenu Helpmenu = new JMenu("Help"); menuBar.add(Helpmenu); JMenuItem Aboutitem = new JMenuItem("About"); Helpmenu.add(Aboutitem); } }

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  • How can I use multithreading in a Windows Forms application to update a progress bar?

    - by Steve Syfuhs
    There are two objects. The Windows Form with a button and a progress bar, and another object that handles an algorithm. In the algorithm object there is an event, and a property. The event is ProgressChanged, and the property is Progress (which is an int). In the calling window, the button starts off a set of steps in the algorithm object. As each step (or substeps) occurs, the ProgressChanged event fires, and in the window there is an event handler that essentially increments the progress bar relative to the Progress property. The problem I am running into is that because the algorithm has a possibility (and high liklihood) of running a relatively long time, I need to move it into it's own background thread and push the event back up to the window. My issue is that I'm not completely sure what I'm doing when it comes to multi-threading. I've looked at Control.Invoke and I'm a little lost. Can someone point me in the right direction?

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