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• using BOSH/similar technique for existing application/system

  - by SnapConfig.com

  We've an existing system which connects to the the back end via http (apache/ssl) and polls the server for new messages, needless to say we have scalability issues. I'm researching on removing this polling and have come across BOSH/XMPP but I'm not sure how we should take the BOSH technique (using long lived http connection). I've seen there are few libraries available but the entire thing seems bloaty since we do not need buddy lists etc and simply want to notify the clients of available messages. The client is written in C/C++ and works across most OS so that is an important factor. The server is in Java. does bosh result in huge number of httpd processes? since it has to keep all the clients connected, what would be the limit on that. we are also planning to move to 64 bit JVM/apache what would be the max limit of clients in that case. any hints?

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• Run groovy script from within gradle

  - by macattack

  What's the best way to create a gradle task, which runs a groovy script? I realize that gradle build files are groovy, so I would think it would be possible to do something like this: task run << { Script app = new GroovyShell().parse(new File("examples/foo.groovy")) // or replace .parse() w/ a .evalulate()? app.run() } I get all kinds of whacky errors when I try this if bar.groovy is using @Grab annotations or even doing simple imports. I want to create a gradle task to handle this, so that I can hopefully reuse the classpath definition. Would it be better to move the examples directory into the src directory somewhere? What's a best practice?

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• Constraining window position to desktop working area

  - by simplecoder

  I want to allow a user to drag my Win32 window around only inside the working area of the desktop. In other words, they shouldn't be able to have any part of the window extend outside the monitor(s) nor should the window overlap the taskbar. I'd like to do it in a way that does cause any stuttering. Handling WM_MOVE messages and calling MoveWindow() to reposition the window if it goes off works, but I don't like the flickering effect that's caused by MoveWindow(). I also tried handling WM_MOVING which prevents the need to call MoveWindow() by altering the destination rectangle before the move actually happens. This resolves the flickering problem, but another issue I run into is that the cursor some times gets aways from the window when a drag occurs allowing the user to drag the window around while the cursor is not even inside the window. How do I constrain my window without running into these issues?

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• Using accelerometer to detect iPad lock switch trigger?

  - by DevDevDev

  So for complicated reasons I am managing view rotations myself, and am only implementing UIDeviceOrientationPortrait as the autorotating orientation. Anyway, when one clicks the screen lock on the iPad, the device will rotate to UIDeviceOrientationPortrait, which will cause my code to rotate, which I do not want to happen. For instance of the user is holding the device in "landscape mode", i.e. I have already manually rotated the UI to landscape mode, and he/she clicks the screen lock, it will rotate the UI to portrait mode, even though the user did not move the device at all. So somehow I need a way to differentiate between rotations to portrait mode occuring from the screen lock, and those occuring from device rotation. As such, I would like somehow to use the accelerometer to detect whether or not the device was actually 'rotated' or whether the button was clicked. Thanks!

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• rails routes for permalink with namespaced class

  - by David

  this one in my routes works perfectly: map.connect ':permalink', :controller = 'pages', :action = 'show' for this class: class PagesController < BackendController and on /xxx/pages it is shown like this: <%= link_to "#{item.link_name}", {:controller = :pages, :action = :show, :permalink = item.permalink} % which will generate a link like "how-to-create-permalinks". but i decided to move the PagesController into a subdirectory so the class is now written like so: class Backend::PagesController < BackendController But how does the route look like now? And how do i display it on the template so it links using the permalink? Thanks!

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• Rails: Skinny Controller vs. Fat Model, or should I make my Controller Anorexic?

  - by Nick Gorbikoff

  I know similar questions have been answered before - such as: Where should logic go, where to do certain tasks, etc. But I have a more specific question - How far should I take this axiom: "keep your controller skinny, make your model fat!" Here is an example: For instance let's say I have multiple source of verification data. A good example would be a VIN number - I can verify it against, manufacturers data source, DMV's data source, also my local databases - to see what I have on record. So I have a model called Vin and vins_controller. Inside the model I have 5 methods: check_against_local_db, check_against_dmv, check_against_car_maker_1, check_against_car_maker_2, etc. In my controller keeping with the REST, in action show - I have a simple case statement which looks at the params[:source], and based on source specified - will call specific check method. Now here is the question: Should I leave the logic that governs which data source to call in controller or should I move it to model and then in controller just do something like check_vin(source, vin)? Should I make my controller anorexic?

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• Curious to Know what Eclipse 'Show Heap Status' does

  - by GustlyWind

  Hi All In Eclipse (I am using 3.4 Ganymede) there is an option under Preferences>General>Show Heap Status which when checked shows near bottom of IDE like 46M of 98M and if we move the mouse over 'Recycle Bin' it says 'Run Garbage Collector'. I am curoius to know how this works.What will happen when 'Run Garbage Collector' is clicked. My enivroment set up is something like jdk6 is insatlled and IDE used for development and run in Tomcat server. So my understanding is all the objects which are run through Tomcat should be garbage collected. Is this correct. Is there a way to see what objects Eclipse identified as Garbage Cheers

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• Blackberry custom slideshow-style BitmapField manager

  - by Diego Tori

  Right now, I'm trying to figure out how to implement the following: Suppose I have a custom Manager that has about 10 or so BitmapFields layed out in a horizontal manner (similar to a slideshow contained in a HFM ) . What I want to achieve is to be able to move the image HFM via touchEvent horizontally, where a BitmapField would take focus on the left-hand side of the custom Manager. In other words, will I have to give a value to setHorizontalScroll and if so, is it a matter of just incrementing that value when the user makes a left or right touch event. Also, how can I get the focus of a Field within a given position on the screen (i.e. the left-most Field on the HFM) when the HFM is scrolling sideways via touchEvent?

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• Looking for design/architecture suggestions for a simple HTML game.

  - by z-boss

  Imagine that HTML page is a game surface (see picture). User can have n number of boards (blue divs) on his page. Each board can be moved, re-sized, relabeled, created new and removed. Inside each board there are m number of figures (purple divs). Each of these user can move inside the board or to another board, re-size, change color and label, delete, add new. The goal of the game is not important, but let's say it is to rearrange figures in a certain way so that they disappear. But the goal of the programmer is to save the whole game surface in the database for every user of the site, and to load it later when he returns. So, how do I go about data exchange between client and the database? I'll give my idea in one of the answers.

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• Silverlight 4: ToolTipService

  - by xscape

  I can't scroll to my scrollviewer, it disappear when I move the mouse. Was it because it was just a tooltip? If yes, is there a way to scroll the text in my tooltip? <TextBlock TextWrapping="Wrap" Style="{StaticResource TextBlockWidthStyle}" Text="{Binding ExtendedDescription}" TextTrimming="WordEllipsis"> <ToolTipService.ToolTip> <ScrollViewer Width="310" VerticalScrollBarVisibility="Auto"> <TextBlock Text="{Binding ExtendedDescription}" Width="300" TextWrapping="Wrap"/> </ScrollViewer> </ToolTipService.ToolTip> </TextBlock>

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• Wpf- Is there any way to disable some of the default hotkeys in a RichTextBox?

  - by Justin

  I have several keybindings in my text editing application that no longer work now that I have switched from using a regular textbox to using a richtextbox. This is because the wpf richtextbox has several default hokeys such as "Ctrl+1", "Ctrl+2", and "Ctrl+5". My keybindings are defined in a view that contains the view that the richtextbox is in. I can't move the keybindings to the richtextbox; Is there any fix for this problem? Other than using a third-party control or creating my own richtextbox from textboxbase.

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• Direct3D 11 effect files deprecated?

  - by Toji

  I've been playing around with Direct3D 11 a little bit lately and have been frustrated by the lack of documentation on the basics of the API (such as simple geometry rendering). One of the points of confusion brought on by the sparse documentation is the (apparent) move away from the use of effects for shaders. In D3D11 all of the effect (.fx) support has been removed from the D3DX libraries and buried away in a hard to find (sparsely documented, of course) shared source library. None of the included examples use it, preferring instead to compile HLSL files directly. All of this says to me that Microsoft is trying to get people to stop using the effect file format. Is that true? Is there any documentation of any kind that states that? I'm fine doing it either way, but for years now they've been promoting the .fx format so it seems odd that they would suddenly decide to drop it.

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• jQuery hover function

  - by Daniel Hertz

  So I have a hover function that is supposed to move an arrow under the corrent the link that someone hovers over. The problem is, the arrow never returns to the current link when the person stops hovering over the link. However, if I set the left properly with a constant value it works. Anyone have any ideas? var currentId = '#' + $('body').attr('id') + '_link'; var xCordCurrent = $(currentId).offset().left - ($('#arrow').width() / 2); var xCordHover = $(event.target).offset().left + ($(event.target).width() / 2) - ($('#arrow').width() / 2); $('#arrow').animate( { left: xCordHover }, { duration: 'slow', easing: 'easeOutBack' }) }, function(event) { $('#arrow').animate( { left: xCordCurrent }, { duration: 'slow', easing: 'easeOutBack' }) });

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• Best way to access database from android

  - by Brandon Delany

  I am working on a Android app and I have a dilemma. I have a list of Objects. I have to update each of these objects with a database. I have 2 methods: Method 1: I can loop through the Objects. For each object I can connect to the server, update it, and then move on to the next Object, and so forth. Method 2: I can store the Objects in a list, send the whole list to the server, update it on the server side, then return a list of updated objects. My questions are: Which method is faster? Which method is easier on the phone's battery? By the way, Method 1 is easier for me to code :). Thank you.

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• UIScrollView content to track a CAKeyFrameAnimation along a path

  - by CMLloyd

  In my App I have a full-screen UIScrollView where the content is a UIImageView containing a map image which is about 2000px square (i.e. larger than the UIScrollView). Currently, I plot a path across the map and animate a "beacon" image along it using a CAKeyFrameAnimation, which works great. What I would like to be able to do is to make the UIScrollView content move with the animation in such a way as to keep the beacon image in the centre of the screen (giving the user the impression of tracking along the path). Any suggestions on how I might achieve this?

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• How can I resume downloads in Perl?

  - by Neeraj

  I have a project that depends upon some other binaries to be downloaded from web at install time.For this what i do is: if ( file-present-in-src/) # skip that file else # use wget to download the file The problem with this approach is that when I interrupt a download in middle, and do invoke the script next time, the partially downloaded file is also skipped (which is not desired), also I want wget to resume the download of the partially downloaded file. How should I go about it: Possible Solutions I could think of: Let the file to be downloaded to some file say download_tmp. Move to original file if successful. Handle SIG{'INT'} to write proper cleanup code. But none of these could help resume the partial file download, Any insights?

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• Guiding a Robot Through a Path

  - by Hamza Yerlikaya

  I have a field filled with obstacles, I know where they are located, and I know the robot's position. Using a path-finding algorithm, I calculate a path for the robot to follow. Now my problem is, I am guiding the robot from grid to grid but this creates a not-so-smooth motion. I start at A, turn the nose to point B, move straight until I reach point B, rinse and repeat until the final point is reached. So my question is: What kind of techniques are used for navigating in such an environment so that I get a smooth motion? The robot has two wheels and two motors. I change the direction of the motor by turning the motors in reverse. EDIT: I can vary the speed of the motors basically the robot is an arduino plus ardumoto, I can supply values between 0-255 to the motors on either direction.

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• Searching Techniques/Algorithms for Resources over a given area

  - by Raydon

  I have a flat area with nodes randomly placed on this flat surface. I need techniques which are able to take a starting point, move in a certain way (the algorithm), find nodes and continue searching. I do not have an overall view of the surface (i.e. I cannot see everything), only a limited view (i.e. 4 cells in any direction). Ideally, these methods would be efficient in the way that they work. Any points in the right direction would be greatly appreciated.

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• Working local and upload on save in Eclipse with Aptana

  - by Saif Bechan

  Currently I am working in Dreamweaver for my web project. The way I work is open local files, and when I save the files are uploaded via FTP to my server. This works great because I have the same files local and on the server, and I don't have to move the files around a lot. Is this possible in eclipse with Aptana? I have tried working with RSE(remote system explorer), but then I only work with the remote files. I have also tried the normal Aptana FTP features, but there is no 'save on upload' feature. Does anyone have some recommendations for me?

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• Jquery draggable persistence either through mysql or saving cookie in the database?

  - by Muhammad Jehanzaib

  I want to know that how can I persist the divs dropped on a draggable. I have been trying since long but stuck at this point. Actually you can see the demo here. I have to save the user designed wedding floor. So whenever user logins next time he/ she is able to see the last design saved. The code is shown below: $(document).ready(function() { $("#droppable").droppable({ accept: '.draggable', drop: function(event, ui) { $(this).append($(ui.draggable).clone()); $("#droppable .draggable").addClass("objects"); $(".objects").removeClass("ui-draggable draggable"); $(".objects").draggable({ containment: 'parent', }); } }); $(".draggable").draggable({ helper: 'clone', tolerance: 'touch', cursor:'move' }); });

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• Custom jQuery dropdown

  - by Coughlin

  I am creating a custom simple dropdown using jQuery that hides/shows a element based on over state. The problem I have now is that when you go over the shown element it hides, you cant move your mouse in to the dropdown that was created. Any thoughts on how to fix that also, is there an easier way to do what I have? I am going to be reusing this and not sure the best way to set the code up for I dont need to copy/paste six times. $(function(){ $("#dog-nav").hover( function(){ $(".sub-drop-box-dog").show("fast"); }, function(){ $(".sub-drop-box-dog").hide("fast"); } ); $("#cat-nav").hover( function(){ $(".sub-drop-box-cat").show("fast"); }, function(){ $(".sub-drop-box-cat").hide("fast"); } ); });

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• UILabel reset after Autorotate

  - by MB

  Hi, I have a UILabel in a view that is set by calling a method against my view controller. The app is a TABBar app and the VC is in the MORE section. When I rotate the phone the label disappears (don't mind that) when I rotate back the label is showing all .......... (the value it is set to in the XIB) I added a line to set the label in the shouldAutoRotateToOrientation method lblProductTxt.titleLabel.text = self.productText; when autorotating what viewcontroller methods are being called. ?? the shouldAutoRotateToOrientation method doesn't get called when the VC is in the More section but when I move it it does get called but has no affect on the labeltext

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• How do I maintain formatting of comments when I save them to the database in an asp.net mvc applicat

  - by baijajusav

  The title was probably not very clear. Consider this scnerio: you have a blog site or really just any site where a user can respond via a comment. You want to maintain the formatting for the comments. So paragraph's should be separated, first sentence indented, bolding of keywords allowed, etc. How would one go about doing this? This is something just about every kind of blogging site handles, including this site. My initial guess is that comments are saved to that database either in an xml format or as the raw html. Those are really my only guesses. I suppose magic strings could be used to denote the starting and ending of various formatting as well, but magic strings are generally frowned upon. I'm doing this in an asp.net mvc application. I'm using version 1 of mvc, but I would be willing to move to 2 if that makes for an easy solution here.

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• Drawing the UIPicker values from multiple components?

  - by Rob

  I have the UIPicker setup with multiple components and a button below it. Depending on what the user has chosen with the UIPicker determines which new view will be loaded but I am having trouble determining how to extrapolate the information from the picker itself. Right now I have this method being called when the button is pressed: - (IBAction) buttonPressed { if (component:1 == 1 && component:2 == 1) { //Load the view number 1. } else if (component:1 == 2 && component:2 == 1) { //Load the view number 2. } else { //Load the view number 3. } } I obviously know that my code is wrong but I hope it gets the point across. I have multiple components and I need to figure out how to use the information that the user is scrolling to on the picker to determine which view to move to. (I know how to load the views, I just commented those in the code to illuminate the problem areas better.)

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• What do you do when every possible business idea is already taken?

  - by jonathanconway

  I have a bit of free time and lots of enthusiasm for software and the web. I want to make a start-up, to sell kind of product or online service, but I'm having a hard time coming up with business ideas that haven't already been implemented. For example, I thought of making an e-ordering website for ordering food from restaurants online. Good thing I typed it into Google, because the market is already full of hundreds of websites doing the same thing and competing heavily. The same thing has happened with so many other business ideas I've become excited and passionate about - they're all taken. What's your response to this? Do you agree that all the good ideas seem to be taken? Or do you think there is room for new businesses, and that I'm just not thinking (or looking) hard enough? Have you ever tried idea after idea, only to find that it was already being done, and you had to move onto something else?

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