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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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• 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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• 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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• Qt training tips and tricks

  - by 0xDEAD BEEF

  I have just arrived at new company and have never worked with Qt before, but my task is to learn Qt in 2 weeks, so i can give training to others. So i got 2 weeks to learn Qt and prepare for 2 weeks long Qt training. I am so dead! Please point out some common mistakes, tricks, styles so i can make that training a bit better! Thank you!

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• Where to get pure C++ Lame MP3 encoder - PCM to MP3 example?

  - by Ole Jak

  So all I need is a simple function that sets it up (eating incoming PCM RATE (for example: rate near to 44100) It's channels (for example: 2) and -bits (for example: 16) and desirable 128 kb\s rate) and another one that takes PCM data and encodes it into pure MP3 frames. I know it looks like a silly homework task but I assure you - it is not. I hope it will be of help to all C++ developers starting with MP3s. So can anybody please help me with that?

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• Customizing Log4j to filter PatternLayout

  - by JavaScriptDude

  Greetings, I have just starting migrating to WLS 10.x and have noticed that the thread name [%t] for WL is quite verbose and more informative than I need for my deployment needs. Ultimately, I only care about the thread ID but WL gives me this:    [ACTIVE] ExecuteThread: '0' for queue: 'weblogic.kernel.Default (self-tuning)' ~ Does anybody know if there is a way in log4j to write a custom filter that will allow me to override PatternLayout so I can parse the WLS Thread Name to just output the thread ID which in this case above is 0. I'd rather extend then customize as it makes upgrading libraries so much easier. Thanks :) - JsD

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• Identifying voice as male or female

  - by duder

  I'm not much into audio engineering, so please be easy on me. I'm receiving an audio file as input, and need to detect whether the speaker is male or female. Any ideas how to go about doing this? I'm using php, but am open to using other languages, and don't mind learning a little bit of sound theory as long as the time is proportionate to the task.

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• How to convert SVG images for use with Pisa / XHTML2PDF?

  - by Nick Sergeant

  I'm using Pisa/XHTML2PDF to generate PDFs on the fly in Django. Unfortunately, I need to include SVG images as well, which I don't believe is an easy task. What's the best way to go about either a) converting the SVGs to PNG / JPG (in Python) or b) including SVGs in the PDF export from Pisa?

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• What are the best (powerful yet easy) languages to implement text/data processing and code genegatio

  - by Ivan

  If I want to write my engine which will generate all the code solving the task described in simple declarative style, what languages should I look at?

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• How to simulate windows shutdown while debugging (c#/.net winforms app)?

  - by Rory

  I have an issue with my application when windows shuts down - my app isn't exiting nicely, resulting in the End Task window being displayed. How can I use the debugger to see what's going on? e.g. is there a way to send the windows shutdown message(s) to my application so it thinks windows is shutting down, so i can see exactly how it behaves?

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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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• How to handle set based consistency validation in CQRS?

  - by JD Courtoy

  I have a fairly simple domain model involving a list of Facility aggregate roots. Given that I'm using CQRS and an event-bus to handle events raised from the domain, how could you handle validation on sets? For example, say I have the following requirement: Facility's must have a unique name. Since I'm using an eventually consistent database on the query side, the data in it is not guaranteed to be accurate at the time the event processesor processes the event. For example, a FacilityCreatedEvent is in the query database event processing queue waiting to be processed and written into the database. A new CreateFacilityCommand is sent to the domain to be processed. The domain services query the read database to see if there are any other Facility's registered already with that name, but returns false because the CreateNewFacilityEvent has not yet been processed and written to the store. The new CreateFacilityCommand will now succeed and throw up another FacilityCreatedEvent which would blow up when the event processor tries to write it into the database and finds that another Facility already exists with that name.

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• Can anyone recommend a command line virus scanner that is open source and works with linux/php/apach

  - by Scarface

  Hey guys recently I have had the 'priveledge' of trying to set up an anti virus scanner to scan file uploads to my VPN server. I just finished trying to set up ClamAV but it slowed my server down to a hault once initiated so I had to kill it. Does anyone have any recommendations to a program that will accomplish my task and can be executed in php (other than clamAv)? Any advice greatly appreciated.

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• Integrating twitter pull request with another application

  - by jade

  i'm an absolute newbie to webapps, so please forgive if my question is quite naive or not upto the mark.i have been assigned a task to develop a web app which integrates the twitter pull request with another application using the particular application APIs.basically i dont know what it means.Can anyone explain what is intended to be done and if there is any example of such web apps if any,it will be most appreciated, so that i can get an idea of what is to be actually done.i'm planning to do this using ruby

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• php how to open new tab or new window

  - by dpaksp

  in php my task here is before user downloads a file i have display a form thr where i can get details of user i.e form1...on click on submit button it will go to next php file where it process some logic...from thr i have open new tab or new window in that i have display my file or any thing ....how to do thank u

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• NSOperationqueue i want to block main thread

  - by alexeyndru

  i want to block the main thread until something else is done in the background. i used: result=[self performSelectorInBackground:@selector(calculate:) withObject:expression]; just bellow this line I am using result: [self use:result]; i dont want to use result until it is available. to achieve this I implemented calculate: { [[(AppDelegate *)[[UIApplication sharedApplication] delegate] queue] waitUntilAllOperationsAreFinished]; calculating result... } and still, the result is used before it is calculated. so, i didnt block the main thread. pls help me do that. thanks

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• How to launch from Eclipse in Low priority under Windows?

  - by adum

  I'm running programs from Eclipse (on Windows) that eat a lot of CPU time. To avoid bogging down my whole machine, I set the priority to Low with the Task Manager. However, this is a cumbersome manual process. Is there a way Eclipse can set this priority automatically? EDIT: I realized that each particular launcher (Java, Python etc) has its own configuration method, so I will restrict this question to the Java domain, which is what I need most.

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• How to convert a video via ffmpeg to an mp4 format that will stream and/or download to iPhone and Bl

  - by Yegor

  I have a site where people upload videos, which are converted to .flv format. Simple. I wanted to also convert to an mp4 format that will "stream" to an iphone and blackberry, or allowed to be downloaded to either, for later viewing. Can someone post a working ffmpeg line to accomplish this task? Closest I got was this (which doesn't work) ffmpeg -i in.avi -f mp4 -vcodec libx264 -maxrate 1000 -qmin 3 -qmax 5 -bufsize 4096 -g 300 -acodec libfaac -s 480x320 -ab 128k -qscale 7 out.mp4

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• URL Controller Mapping Strategies (PHP)

  - by sunwukung

  This is kind of an academic question, so feel free to exit now. I've had a dig through Stack for threads pertaining to URL/Controller mapping in MVC frameworks - in particular this one: http://stackoverflow.com/questions/125677/php-application-url-routing So far, I can ascertain two practices: 1: dynamic mapping through parsing the URL string (exploded on '/') 2: pattern matching matching url to config file containing available routes I wanted to get some feedback (or links to some other threads/articles) from folks regarding their views on how best to approach this task.

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• Convert image buffer to pdf with ImageMagick in C++

  - by Chris

  Hi, I've downloaded the dll's for ImageMagick and am wondering if anybody knows of some example code to accomplish a simple task: I have generated an image in C++ and have the buffer in RGB format. I need to convert it to PDF format (without writing to a file) before sending it over a TCP socket. Is this doable with ImageMagick (or any other library)?

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• Manage views for content types (or add a view to multiple lists)

  - by Janis Veinbergs

  I'm surprised that I cannot find on the net a solution where I could manage views for content types. Do I really have to visit each task list with my browser to add/modify a view? Is there any solutions available that would allow me to just define a view for content type and thus make this view available on all lists where content type is?

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• Accelerometer data analysis

  - by jrrt

  Hello, I would like to know if there are some libraries/algorithms/techniques (python, if at all possible) that help to extract features from accelerometer data (extracted from and android phone, btw), like periodicity of movements, energy of acceleration and the like. Has anyone done this kind of task before? Thank you very much in advance :)

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• Best solution for a windows service with constant running threads in C# 4.0

  - by dagda1

  Hi, I want to create a windows service that will create x number of threads that wake up every x number of minutes and do some work. I think the task scheduling or parallel framework is a bad fit for this type of work as it is best suited for work that starts, completes and finishes rather than is constant. Should I look at utilising a thread pool for this approach or does anyone have any advice for a good solution? Thanks Paul

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• What to use to check html links in large project, on Linux?

  - by depesz

  I have directory with 1000 .html files, and would like to check all of them for bad links - preferably using console. Any tool you can recommend for such task?

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• How can I make a changing numerical value for a taskbar icon in C#?

  - by Waffles

  I'm trying to make a program in C# that monitors the processor time of an application. I'd like to have a feature in this program where the task-bar icon is actually a number representing the processor time (like what coretemp has). How would I go about doing something like this?

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