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  • What are the performance characteristics of SignalR at scale?

    - by Joel Martinez
    I'm interested in the performance characteristics of SignalR at scale ... particularly, how it behaves at the fringes of capability. When a server is at capacity, what happens? Does it drop messages? Do some clients not get notified? Are messages queued until all are delivered? And if so, will the queue eventually overflow and crash the server? I ask because conducting such a test myself would be impractical, and I'm hoping someone could point me to documentation speaking to this ... or perhaps someone could comment that has seen how SignalR behaves at scale. Thanks! note: I'm familiar with this other stackoverflow question on the stability and scalability of SignalR. But I believe my question is asking a slightly different question in that I'm not concerned with the theoretical scaling limits, I want to know how it behaves when it reaches the limits ... so I know what to be on the lookout for.

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  • Easiest way to position camera in XNA?

    - by DMan
    Everytime I load my model into XNA, I can usually see it far off in the distance. When I change some parameters and make it zoom up close, 10/10 times it's rotated funny and I'm set with the task of rotating it. Is there any easy way to do it except by experimenting? Or am I exporting it wrong (using Blender)? Is there any value I should set the objects in my 3d scene to be before exporting it so they appear 'upright'?

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  • Fastest possible summing numbers up to N

    - by dada
    Okay so i need really FAST algorithm or code in C if you have any it would be nice. The task is to sum all numbers from 1 to N for a given number N (it can be negative number too), so i did the usual way (you know just summing with loop from 1 to N) but it's not fast enough - i need something faster, i guess that i need the fastest possible way to do this. If anyone could help me, please do. Thanks.

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  • C#: returns array from object.

    - by jitm
    Hello, There is the next task: I need to check if input parameter (object) is array, then return array of input elements. For example I have input array like this: int [] array = {1,2,3,4}; And method private object[] GetArray(object @from) { } So, I need to check in this method that input variable is array and after return this array. For checking I use if(@from.GetType().IsArray) And how to create array from object ??? Is it possible ? Thanks.

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  • android phone's scroll ball, D-Pad not working

    - by user270811
    hi, i have a Cliq and a MyTouch phone. i am writing a game that requires a fire button. on the cliq, it's the center of the D-Pad, and on the MyTouch, the scroll ball. i am handling the onKeyDown events via a separate thread. it all works until i press the button too many times, meaning the key down event is no longer fired off. if i press the D-Pad down or scroll the ball down, then the fire button works again. i can only guess that maybe the message queue within the OS is full, therefore the fire button temporarily malfuntions. can someone help me? thanks.

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  • bash script code help to make zip/tar of several folders .

    - by Arsheep
    I am very new in bash and never coded in before but this task is stuck so need to get rid of it . I need to make bash script to make a single compressed file with several dirs. Like - /home/code/bots/ /var/config/ . . . /var/system/ and all will be compressed to single file /var/file/bkup.[zip][tar.gz] Thanks in advance

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  • Is it possible to generate a XSL-FO template from a PDF?

    - by Vihung
    Given a PDF document, is it possible to generate a XSL-FO (FOP) template? Obviously, this would be a one-time thing - the generated template would just be a starting point for creating a proper template that pulls in the appropriate data. For me, the ideal tool for doing so would be a Java-based one and should be executable from the command line or through an ANT task. Failing that, it would be something that runs on Linux and MacOS X.

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  • Killing a process that keeps respawning

    - by terabytest
    I got infected by a virus. It looks like I removed it, but it somehow injected a few more processes (I can see them in the task manager) that respawn when I kill them (somehow). Is there a way to destroy those process to stop them from respawning, or in the case something else is respawning them, to kill that "something"?

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  • How do I open a hardware accelarated DirectX window on a secondary screen

    - by user567021
    I'm looking to create a hardware accelarated DirectX (9 at the moment) window on a secondary screen. This screen is connected to the same graphics display as the primary screen (at least at the moment). Currently, when I try to open the window on the secondary screen based on window position or by dragging it there, CPU usage jumps by about 10%, which seems to indicate that windows is switching to a software fallback rather than the hardware accelaration. Machine is windows XP running a NVIDIA graphics card (varying cards as this runs on several machines), with the latest driver. It's also running CUDA at the same time to produce the images if that matters. Programming language is c++, manual window and message queue creation, no tookbox used at the moment to manage the GUI Thanks

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  • How can I tell if the screen is on in android?

    - by user297020
    In Android 2.2 (Level 7) the function PowerManager.IsScreenOn() returns a boolean that is true if the screen is turned on and false if the screen is turned off. I am developing code for Android 1.5 (Level 3). How do I accomplish the same task in older versions of Android? I do not want to turn the screen on or off in my code. I just want to know what it is.

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  • MooTools event listener disappears after element.innerHTML is changed

    - by acoder
    Hi everyone, I am trying to achieve this task using MooTools. Description: I attached an event listener to "myButton" link. A click on this link initiates an AJAX request and updates "myDiv" content based on the response text. During this request a POST variable is being sent to "button.php", but it's not used at the moment.. (i wish to use it later) OK, as a result, "myDiv" gets exactly the same link with the same ID (myButton) + a random number, so that we could see that each click generates a new number. The problem: After the first click on "myButton", "myDiv" updates correctly, showing a random number. When I click "myButton" for the second time (this time in newly updated div), the div does not refresh anymore. Please note that I need "myButton" to be inside "myDiv", and "myDiv" must be updated (refreshed) after each click without having to refresh the entire page. Can somebody show me how to achieve this task based on this simplified code example? index.html <html> <head> <script type="text/javascript" src="mootools-1.2.4-core-nc.js"></script> <script> window.addEvent('domready', function() { $('myButton').addEvent('click', function(e) { e.stop(); var myRequest = new Request({ method: 'post', url: 'button.php', data: { action : 'test' }, onRequest: function() { $('myDiv').innerHTML = '<img src="images/loading.gif" />'; }, onComplete: function(response) { $('myDiv').innerHTML = response; } }); myRequest.send(); $('myButton').removeEvent('click'); }); }); </script> </head> <body> <div id="myDiv"> <a id="myButton" href="#">Button</a> </div> </body> </html> button.php <a id="myButton" href="#">Button</a> clicked <?php echo rand(1,100); ?>

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  • Symfony2 Forms: is it possible to bind a form in an "unconventional way"?

    - by DonCallisto
    Imagine this scenario: in our company there is an employee that "play" around graphic,css,html and so on. Our new project will born under symfony2 so we're trying some silly - but "real" - stuff (like authentication from db, submit data from a form and persist it to db and so on..) The problem As far i know, learnt from symfony2 "book" that i found on the site (you can find it here), there is an "automated" way for creating and rendering forms: 1) Build the form up into a controller in this way $form = $this->createFormBuilder($task) ->add('task','text'), ->add('dueDate','date'), ->getForm(); return $this->render('pathToBundle:Controller:templateTwig', array('form'=>$form->createview()); 2) Into templateTwig render the template {{ form_widget(form) }} // or single rows method 3) Into a controller (the same that have a route where you can submit data), take back submitted information if($rquest->getMethod()=='POST'){ $form->bindRequest($request); /* and so on */ } Return to scenario Our graphic employee don't want to access controllers, write php and other stuff like those. So he'll write a twig template with a "unconventional" (from symfony2 point of view, but conventional from HTML point of view) method: /* into twig template */ <form action="{{ path('SestanteUserBundle_homepage') }}" method="post" name="userForm"> <div> USERNAME: <input type="text" name="user_name" value="{{ user.username}}"/> </div> <div> EMAIL: <input type="text" name="user_mail" value="{{ user.email }}"/> </div> <input type="hidden" name="user_id" value="{{ id }}" /> <input type="submit" value="modifica i dati"> </form> Now, if into the controller that handle the submission of data we do something like that public function indexAction(Request $request) { if($request->getMethod() == 'POST'){ // sono arrivato per via di un submit, quindi devo modificare i dati prima di farli vedere a video $defaultData = array('message'=>'ho visto questa cosa in esempio, ma non capisco se posso farne a meno'); $form = $this->createFormBuilder($defaultData) ->add('user_name','text') ->add('user_mail','email') ->add('user_id','integer') ->getForm(); $form->bindRequest($request); //bindo la form ad una request $data = $form->getData(); //mi aspetto un'array chiave=>valore /* .... */ We expected that $data will contain an array with key,value from the submitted form. We found that it isn't true. After googling for a while and try with other "bad" ideas, we're frozen into that. So, if you have a "graphic office" that can't handle directly php code, how can we interface from form(s) to controller(s) ? UPDATE It seems that Symfony2 use a different convention for form's field name and lookup once you've submitted that. In particular, if my form's name is addUser and a field is named userName, the field's name will be AddUser[username] so maybe it have a "dynamic" lookup method that will extract form's name, field's name, concat them and lookup for values. Is it possible?

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  • Does anybody know of an Atom APP server for .Net?

    - by ianmayo
    Hi all, I'm aware of the Argotic framework for .Net that assists in the collation and management of Atom data, but does anybody know of a .Net application/framework that implements the Atom Publishing Protocol (APP)? Creating a .Net APP server from scratch seems a daunting task, even if it 'stands on the shoulders' of Argotic. Maybe a .Net rewrite of Apache Abdera (or other O/S implementation) would be easier. I welcome your thoughts, Ian

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  • Getting the download count of a specific S3 object

    - by phidah
    I've got a number of S3 objects that are available to my customers. Since I'd like to bill my customers by usage, I wondered if there is any smart kind of way to get the number of times a given file has been downloaded? Alternatively, I suppose I could parse the log files provided by S3, but with 10m+ fetches per customer this might be bit of a task. Any ideas?

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  • Implementing the procducer-consumer pattern with .NET 4.0

    - by bitbonk
    With alle the new paralell programming features in .NET 4.0, what would be a a simple and fast way to implement the producer-consumer pattern (where at least one thread is producing/enqueuing task items and another thread executes/dequeues these tasks). Can we benfit from all these new APIs? What is your preferred implementation of this pattern?

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  • Use of ebay API

    - by Hab
    I am given a task to R& D ebay api. As i have tried to explore on net i still have no clear idea that how and why to use it in my apps. Also are there many ebay api's for different purposes? Any sample code available using this api in objective c for iPhone. Any doc available providing general info about it.

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  • [Flex] Caching canvas into ByteArray

    - by Eugene
    Task: (all in code, not visual) create a canvas, place into it some labels and draw some lines, then cache it as byteArray. The problem is that if I cache an object that is already drawed on the screen, it works great, but if I cache a canvas, that have been created few lines earlier, this results white image. Is there any solution to cache a display object, that was created in code, but not intended to be displayed at all?

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  • Syncing Online Content with iPhone Application

    - by PF1
    Hi Everyone: I am looking for some way to sync a online XML file with my iPhone application and only download the newest changed items. Each item is marked with a date attribute, so I assume this is possible. I have heard that Core Data can accomplish this task, but I am unsure of the suggested method and how to approach implementing it. Thanks for any help.

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  • Weird exception with delayed_job

    - by Tam
    Trying to queue a job with delayed_job as follows: Delayed::Job.enqueue(BackgroundProcess.new(current_user, object)) current_user and object are not nil when I print them out. The weird thing is that sometimes refreshing the page or running the command again works! Here is the exception trace: Delayed::Backend::ActiveRecord::Job Columns (44.8ms) SHOW FIELDS FROM `delayed_jobs` TypeError (wrong argument type nil (expected Data)): /Users/.rvm/rubies/ruby-1.9.1-p378/lib/ruby/1.9.1/yaml.rb:391:in `emit' /Users/.rvm/rubies/ruby-1.9.1-p378/lib/ruby/1.9.1/yaml.rb:391:in `quick_emit' /Users/.rvm/rubies/ruby-1.9.1-p378/lib/ruby/1.9.1/yaml/rubytypes.rb:86:in `to_yaml' vendor/plugins/delayed_job/lib/delayed/backend/base.rb:65:in `payload_object=' activerecord (2.3.9) lib/active_record/base.rb:2918:in `block in assign_attributes' activerecord (2.3.9) lib/active_record/base.rb:2914:in `each' activerecord (2.3.9) lib/active_record/base.rb:2914:in `assign_attributes' activerecord (2.3.9) lib/active_record/base.rb:2787:in `attributes=' activerecord (2.3.9) lib/active_record/base.rb:2477:in `initialize' activerecord (2.3.9) lib/active_record/base.rb:725:in `new' activerecord (2.3.9) lib/active_record/base.rb:725:in `create' vendor/plugins/delayed_job/lib/delayed/backend/base.rb:21:in `enqueue'

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  • [Android] any integer return when user read the sms

    - by dhaiwat
    Hi i want to do some activity on sms after user read it, so how can my background service in android know that particular sms is now read(when my service start work) to react for some task. is there system generate any integer when user read sms. if it generate than how will i get? if anyone have any idea than share it.

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  • symfony 1.4: doctrine build model warning

    - by tigerstyle
    Hi volks, I copied my sources from my lokal dev (everything works fine) to my repository and from there I did a checkout on my remote dev. Now when I try to build everything I get this error: devel:/var/www/myproject# ./symfony doc:build-model doctrine generating model classes file+ /tmp/doctrine_schema_48726.yml Warning: file_get_contents(/var/www/myproject/lib/model/doctrine//base/BaseAdvert.class.php): failed to open stream: No such file or directory in /var/www/myproject/lib/vendor/symfony/lib/plugins/sfDoctrinePlugin/lib/task/sfDoctrineBuildModelTask.class.php on line 77 Do you know what the problem could be? Thx for your answers :)

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