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  • How to write reusable code in node.js

    - by lortabac
    I am trying to understand how to design node.js applications, but it seems there is something I can't grasp about asynchronous programming. Let's say my application needs to access a database. In a synchronous environment I would implement a data access class with a read() method, returning an associative array. In node.js, because code is executed asynchronously, this method can't return a value, so, after execution, it will have to "do" something as a side effect. It will then contain some code which does something else than just reading data. Let's suppose I want to call this method multiple times, each time with a different success callback. Since the callback is included in the method itself, I can't find a clean way to do this without either duplicating the method or specifying all possible callbacks in a long switch statement. What is the proper way to handle this problem? Am I approaching it the wrong way?

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  • Can't install fglrx on Kernel 3.11.0-12

    - by byf-ferdy
    I'm running Ubuntu Gnome 13.10 on a Sony Vaio laptop. I tried to install the newest fglrx driver from the cchtml.com guide but no matter which version I use (13.4 or even 13.9) the installation of the generated .debs fails with this message: Error! Bad return status for module build on kernel: 3.11.0-12-generic (x86_64) This seems to be a confirmed bug on launchpad. Currently I'm running the Radeon SI driver but I really need some 3D acceleration. What is there I can do to install any version of fglrx correctly or to speed up the bug-fixing-process? How long does the fixing of these bugs usually take?

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  • KScope - so much going on!

    - by jgelhaus
    Greetings from Kscope 11!  We are enjoying catching up with old friends as well as meeting new ones. There's so many excellent examples of superior development with Oracle Database all over the conference.  Our users never cease to amaze us. There are too many to mention in this short area, but a few highlights include: Monday night's Guru Panel of Tom Kyte, Steve Feuerstein and Cary Millsap ODTUG Board member Monty Latiolais interview with Oracle vp of Database Development, Mike Hichwa Fabulous time aboard the Queen Mary!! See all the Kscope videos As the conference winds down, we thank everyone (wonderful planning and conference execution) as well as bid our goodbyes.  It's just for a short while as we make plans to attend Kscope12 - see ya'll in San Antonio!

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  • Improve efficiency of web building setup and processes - Wordpress on Mac

    - by Rob
    Can anyone see any ways in which I can improve my speed and efficiency with the following setup? Or if there are any obvious holes in my building process? This is for building Wordpress websites on Mac: 1) I have a standard Wordpress setup that I work from which includes various plugins that I tend to use across all setups - thus cutting out the step of having to download them all the time! 2) My standard WP files are copied into a Dropbox folder - thus creating backups of the files. 3) I then open up MAMP and setup a local version. 4) I open up Coda and setup the FTP details so files can be uploaded to the live domain by using the publish button. If anyone has any advice on how to improve this process then please let me know!

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  • tail-like view on HTML logfiles

    - by h0b0
    I'm working on an application that creates HTML log files. I'm tired of having to manually reload and scroll to the bottom in the browser to see the latest entries. A solution that does not really satisfy me is using the Firefox plugins ReloadEvery and ScrollyFox. In many situations reloading frequency and scrolling speed are just to slow. Of course I could actually use tail, but I would prefer a rendered HTML page. Do you have any suggestions? Firefox extensions are preferred, but any other tip is appreciated, too.

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  • how to disable usb storage in ubuntu 13.10?

    - by user288289
    I want to block my all my USB mas storage and allow only devices like keyboard and mouse . I'm able to do so by following the KB. But the issue is that when I connect devices like mobile phones & TABS, I'm able to access the mass storage & able to copy & paste. Disable usb mass storage Kindly advise me how could I block these mobile storage devices. Please note that I only want to block mass storage the other features like charging & android apk execution to mobile should work as usually. Please help...

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  • Winnipeg SQL Server UG April Event &ndash; How To Do An Index Review

    - by D'Arcy Lussier
    April Event - How to Do an Index Review April 14th, 2010 5:30 - 8:00 17th Floor Conference Room, Richardson Building One Lombard Place, Winnipeg Pizza and Drinks Provided! Did you know that SQL Server 2005+ keeps query execution statistics, index usage statistics and even missing index statistics?  Learn how to access this information and use it to help you make good decisions about what your database really needs in terms of indexes in a lot less time than you might think an index review should take.  There are 6 or 7 (depending on your version of SQL server) DMVs (dynamic management views) to look at which reveal a lot about your database and how you can improve its performance. To register for this event, please click HERE to register!

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  • Keyboard "type ahead" in CRUD web apps?

    - by user61852
    In some data entry contexts, I've seen data typists, type really fast and know so well the app they use, and have a mechanic quality in their work so that they can "type ahead", ie continue typing and "tab-bing" and "enter-ing" faster than the display updates, so that in many occasions they are typing in the data for the next form before it draws itself. Then when this next entry form appears, their keystrokes fill the text boxes and they continue typing, selecting etc. In contexts like this, this speed is desirable, since this persons are really productive. I think this "type ahead of time" is only possible in desktop apps, but I may be wrong. My question is whether this way of handling the keyboard buffer (which in desktop apps require no extra programming) is achievable in web apps, or is this impossible because of the way web apps work, handle sessions, etc (network latency and the overhead of generating new web pages ) ?

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  • How to make a ball fall faster on a ramp? Unity3D/C#

    - by Timothy Williams
    So, I'm making a ball game. Where you pick up the ball, drop it on a ramp, and it flies off in to blocks. The only problem right now is it falls at a normal speed, then lightly falls off, not nearly fast enough to get over the wall and hit the blocks. Is there any way to make the ball go faster down the ramp? Maybe even make it go faster depending on what height you dropped it from (e.g. if you hold it way above the ramp, and drop it, it will drop faster than if you dropped it right above the ramp.) Thanks.

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  • Synchronization between game logic thread and rendering thread

    - by user782220
    How does one separate game logic and rendering? I know there seem to already be questions on here asking exactly that but the answers are not satisfactory to me. From what I understand so far the point of separating them into different threads is so that game logic can start running for the next tick immediately instead of waiting for the next vsync where rendering finally returns from the swapbuffer call its been blocking on. But specifically what data structures are used to prevent race conditions between the game logic thread and the rendering thread. Presumably the rendering thread needs access to various variables to figure out what to draw, but game logic could be updating these same variables. Is there a de facto standard technique for handling this problem. Maybe like copy the data needed by the rendering thread after every execution of the game logic. Whatever the solution is will the overhead of synchronization or whatever be less than just running everything single threaded?

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  • On my way home ...

    - by Mike Dietrich
    Modern technology is nice - sitting in the speed train from Holyhead to London Euston - working a bit. This means: I'm heading home. Still 16 hours to go - but up to now everything seems to work fine. Irish Ferries did a great job. Even though they might never have seen some many passengers entering the Ulysses (what a good name for a ship to start the journey with) everybody was so friendly and helpful. The night at Holyhead station ... ahm ... But the train left right in time. German airspace is still closed until at least 8pm tonight. And Irish airspace seems to be closed as well today. So it might be the best decision to take the longer journey. At least now I have the chance to see some countryside (a bit flat out there - but very green) ;-)

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  • What reasons are there for not using a third party version control service?

    - by Earlz
    I've recently noticed a bit of a trend for my projects as of late. I use to run my own SVN server on my VPS, but recently the nail went in the coffin for that when I got my last project migrated from my server to a Mercurial repo on Bitbucket. What are some of the ramifications to this? (disregarding the change in version control systems) It seems like there has been a huge explosion in version control hosting, and companies like Bitbucket even offer private repos for free, and Github and other such services are extremely cheap now. Also, by using them you get the benefit of their infrastructure's speed and stability. What reasons are there these days to host your own version control? The only real reason I can think of is if your source code is super top secret.

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  • Slow Wireless Reconnect After Suspend - Broadcom 4312 with STA drivers

    - by nrhine1
    I am using 10.10 with STA drivers, I reinstalled ubuntu because the b43 drivers were giving me a huge hassle along with some weird kernel issues. My wireless speed is fine, everything works well, except upon restart of computer and after taking the computer out of suspend. It takes about 30-45 seconds for the wireless to reconnect, and I think it is a driver issue (I clicked on the network manager at the top and for about 30 seconds there are no wireless networks listed.) I tried this advice already: http://lilserenity.wordpress.com/2007/10/31/fix-ubuntu-dropping-wireless-on-suspendhibernate-resume/ which basically says to change this: STOP_SERVICES="" to STOP_SERVICES="networking" in the file /etc/default/acpi-support This did not help anything. Something to note is that the issue does not occur when I am logging back in after already logging in once and logging out.

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  • Script to email files content

    - by Tarun
    I have created a shell script that takes backups everyday and emails its execution as successfull or unsuccessfull. Now I want that it send the contents of log file it creates with the mail as well. I have seen how to send file as attachement but I want to send the contents of the file as email message and not the file. Please Help. Its code is like #Email Settings Message_Success="Database Backup generated successfully" Message_Failure="Problem occured while generating Database Backup please verify" Subject="Database Backup Status Mail" Recipients="[email protected]" #Verify Backup Created if [ -f "$Path_Mysql_Dump" ]; then echo "Database Backup Created" >> $Path_Log_File echo "$Message_Success" | mail -s "$Subject" "$Recipients" else echo "Database Backup not created please verify the process will terminate" >> $Path_Log_File echo "$Message_Failure" | mail -s "$Subject" "$Recipients" exit -1 fi

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  • My First Weeks at Red Gate

    - by Jess Nickson
    Hi, my name’s Jess and early September 2012 I started working at Red Gate as a Software Engineer down in The Agency (the Publishing team). This was a bit of a shock, as I didn’t think this team would have any developers! I admit, I was a little worried when it was mentioned that my role was going to be different from normal dev. roles within the company. However, as luck would have it, I was placed within a team that was responsible for the development and maintenance of Simple-Talk and SQL Server Central (SSC). I felt rather unprepared for this role. I hadn’t used many of the technologies involved and of those that I had, I hadn’t looked at them for quite a while. I was, nevertheless, quite excited about this turn of events. As I had predicted, the role has been quite challenging so far. I expected that I would struggle to get my head round the large codebase already in place, having never used anything so much as a fraction of the size of this before. However, I was perhaps a bit naive when it came to how quickly things would move. I was required to start learning/remembering a number of different languages and technologies within time frames I would never have tried to set myself previously. Having said that, my first week was pretty easy. It was filled with meetings that were designed to get the new starters up to speed with the different departments, ideals and rules within the company. I also attended some lightning talks being presented by other employees, which were pretty useful. These occur once a fortnight and normally consist of around four speakers. In my spare time, we set up the Simple-Talk codebase on my computer and I started exploring it and worked on my first feature – redirecting requests for URLs that used incorrect casing! It was also during this time that I was given my first introduction to test-driven development (TDD) with Michael via a code kata. Although I had heard of the general ideas behind TDD, I had definitely never tried it before. Indeed, I hadn’t really done any automated testing of code before, either. The session was therefore very useful and gave me insights as to some of the coding practices used in my team. Although I now understand the importance of TDD, it still seems odd in my head and I’ve yet to master how to sensibly step up the functionality of the code a bit at a time. The second week was both easier and more difficult than the first. I was given a new project to work on, meaning I was no longer using the codebase already in place. My job was to take some designs, a WordPress theme, and some initial content and build a page that allowed users of the site to read provided resources and give feedback. This feedback could include their thoughts about the resource, the topics covered and the page design itself. Although it didn’t sound the most challenging of projects when compared to fixing bugs in our current codebase, it nevertheless provided a few sneaky problems that had me stumped. I really enjoyed working on this project as it allowed me to play around with HTML, CSS and JavaScript; all things that I like working with but rarely have a chance to use. I completed the aims for the project on time and was happy with the final outcome – though it still needs a good designer to take a look at it! I am now into my third week at Red Gate and I have temporarily been pulled off the website from week 2. I am again back to figuring out the Simple-Talk codebase. Monday provided me with the chance to learn a bunch of new things: system level testing, Selenium and Python. I was set the challenge of testing a bug fix dealing with the search bars in Simple-Talk. The exercise was pretty fun, although Mike did have to point me in the right direction when I started making the tests a bit too complex. The rest of the week looks set to be focussed on pair programming with Mike as we work together on a new feature. I look forward to the challenges that still face me and hope that I will be able to get up to speed quickly. *fingers crossed*

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  • Better drivers for SiS 650/740 integrated video?

    - by Bart van Heukelom
    I installed Xubuntu 10.10 on an old box today and the graphical performance is horrid. According to lspci, the video card is this: 01:00.0 VGA compatible controller: Silicon Integrated Systems [SiS] 65x/M650/740 PCI/AGP VGA Display Adapter (prog-if 00 [VGA controller]) Subsystem: ASUSTeK Computer Inc. Device 8081 Flags: 66MHz, medium devsel, IRQ 11 BIST result: 00 Memory at f0000000 (32-bit, prefetchable) [size=128M] Memory at e7800000 (32-bit, non-prefetchable) [size=128K] I/O ports at d800 [size=128] Expansion ROM at <unassigned> [disabled] Capabilities: <access denied> Kernel modules: sisfb Is there a way to make it faster? Alternative drivers? The additional drivers tool shows nothing. I'm specifically interested in improving Java's Java2D rendering speed, because I'll be running a "stat screen" written in that language on it.

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  • Where Facebook Stands Heading Into 2013

    - by Mike Stiles
    In our last blog, we looked at how Twitter is positioned heading into 2013. Now it’s time to take a similar look at Facebook. 2012, for a time at least, seemed to be the era of Facebook-bashing. Between a far-from-smooth IPO, subsequent stock price declines, and anxiety over privacy, the top social network became a target for comedians, politicians, business journalists, and of course those who were prone to Facebook-bash even in the best of times. But amidst the “this is the end of Facebook” headlines, the company kept experimenting, kept testing, kept innovating, and pressing forward, committed as always to the user experience, while concurrently addressing monetization with greater urgency. Facebook enters 2013 with over 1 billion users around the world. Usage grew 41% in Brazil, Russia, Japan, South Korea and India in 2012. In the Middle East and North Africa, an average 21 new signups happen per minute. Engagement and time spent on the site would impress the harshest of critics. Facebook, while not bulletproof, has become such an integrated daily force in users’ lives, it’s getting hard to imagine any future mass rejection. You want to see a company recognizing weaknesses and shoring them up. Mobile was a weakness in 2012 as Facebook was one of many caught by surprise at the speed of user migration to mobile. But new mobile interfaces, better mobile ads, speed upgrades, standalone Messenger and Pages mobile apps, and the big dollar acquisition of Instagram, were a few indicators Facebook won’t play catch-up any more than it has to. As a user, the cool thing about Facebook is, it knows you. The uncool thing about Facebook is, it knows you. The company’s walking a delicate line between the public’s competing desires for customized experiences and privacy. While the company’s working to make privacy options clearer and easier, Facebook’s Paul Adams says data aggregation can move from acting on what a user is engaging with at the moment to a more holistic view of what they’re likely to want at any given time. To help learn about you, there’s Open Graph. Embedded through diverse partnerships, the idea is to surface what you’re doing and what you care about, and help you discover things via your friends’ activities. Facebook’s Director of Engineering, Mike Vernal, says building mobile social apps connected to Facebook in such ways is the next wave of big innovation. Expect to see that fostered in 2013. The Facebook site experience is always evolving. Some users like that about Facebook, others can’t wait to complain about it…on Facebook. The Facebook focal point, the News Feed, is not sacred and is seeing plenty of experimentation with the insertion of modules. From upcoming concerts, events, suggested Pages you might like, to aggregated “most shared” content from social reader apps, plenty could start popping up between those pictures of what your friends had for lunch.  As for which friends’ lunches you see, that’s a function of the mythic EdgeRank…which is also tinkered with. When Facebook changed it in September, Page admins saw reach go down and the high anxiety set in quickly. Engagement, however, held steady. The adjustment was about relevancy over reach. (And oh yeah, reach was something that could be charged for). Facebook wants users to see what they’re most likely to like, based on past usage and interactions. Adding to the “cream must rise to the top” philosophy, they’re now even trying out ordering post comments based on the engagement the comments get. Boy, it’s getting competitive out there for a social engager. Facebook has to make $$$. To do that, they must offer attractive vehicles to marketers. There are a myriad of ad units. But a key Facebook marketing concept is the Sponsored Story. It’s key because it encourages content that’s good, relevant, and performs well organically. If it is, marketing dollars can amplify it and extend its reach. Brands can expect the rollout of a search product and an ad network. That’s a big deal. It takes, as Open Graph does, the power of Facebook’s user data and carries it beyond the Facebook environment into the digital world at large. No one could target like Facebook can, and some analysts think it could double their roughly $5 billion revenue stream. As every potential revenue nook and cranny is explored, there are the users themselves. In addition to Gifts, Facebook thinks users might pay a few bucks to promote their own posts so more of their friends will see them. There’s also word classifieds could be purchased in News Feeds, though they won’t be called classifieds. And that’s where Facebook stands; a wildly popular destination, a part of our culture, with ever increasing functionalities, the biggest of big data, revenue strategies that appeal to marketers without souring the user experience, new challenges as a now public company, ongoing privacy concerns, and innovations that carry Facebook far beyond its own borders. Anyone care to write a “this is the end of Facebook” headline? @mikestilesPhoto via stock.schng

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  • Need more RAM?? Running VMmachine + ubuntu

    - by JBizzle
    So I looked but im running ubuntu in vm machine and its running at a snails pace and I installed the 64bit ver. Running windows 7 64bit the down side is that I only have 2GB of ram installed.....bummer huh I know the answer is im going to need more ram I just want to confirm... Or is there an tip that I can do change some settings to make it run faster in VM? I just want verification on what steps I can take if any to speed things up? Thanks Experts!

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  • Starting web development with ASP.Net [closed]

    - by nayef harb
    Possible Duplicate: Fastest way to get up to speed on webapp development with ASP.NET? If you develop with ASP.NET, which other technologies do you use? How much do i need to learn in order to get an entry level asp.net job? training plan for asp.net and c# Trying to learn ASP.NET What should every programmer know about web development? I learned web development in ASP.Net couple of month ago in college, nothing serious just couple of general lessons. But now I am confused where to start, should I start with HTML and JavaScript before ASP.Net?

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  • How to make a ball fall faster on a ramp?

    - by Timothy Williams
    So, I'm making a ball game. Where you pick up the ball, drop it on a ramp, and it flies off in to blocks. The only problem right now is it falls at a normal speed, then lightly falls off, not nearly fast enough to get over the wall and hit the blocks. Is there any way to make the ball go faster down the ramp? Maybe even make it go faster depending on what height you dropped it from (e.g. if you hold it way above the ramp, and drop it, it will drop faster than if you dropped it right above the ramp.)

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  • Plus besoin de failles pour exploiter les PDF malicieux, un chercheur publie un "Proof of Concept" q

    Plus besoin de failles pour exploiter les PDF malicieux Un chercheur en sécurité publie un "Proof of Concept" qu'il a communiqué aux éditeurs Didier Stevens est un chercheur en sécurité qui vient de sérieusement ébranler le format PDF. Il a en effet publié un "Proof of Concept" (une démonstration qui, volontairement, ne va pas jusqu'au bout) - ou PoC - qui permet de lancer l'exécution d'un code via une ligne de commande dans un document PDF. Avec cette méthode, Didier Stevens arrive par exemple à lancer et à faire tourner une calculatrice. Le PoC présenté sur son blog a été réalisé avec Adobe Reader 9.3.1 sur Windows XP SP3 et Windows 7. Mais il fonctio...

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  • Ubuntu 11.10 doesn't detect Intel integrated graphics (i7-2670QM CPU)

    - by Telmo Marques
    The laptop I'm using is an MSI GT683DX-847PT that comes with an NVIDIA GeForce GTX570M discrete GPU, and an Intel Core i7-2670QM CPU. According to Intel's description of the Core i7-2670QM CPU, it has an HD Graphics 3000 integrated GPU. The problem is that the Intel integrated graphics GPU doesn't come up in lspci nor in lshw, only the NVIDIA GPU shows up. Here is the output of both commands: sudo lspci: http://pastebin.com/raw.php?i=9AZg8bJy sudo lshw: http://pastebin.com/raw.php?i=6cAMFQsY I was counting on having two GPU's to run CUDA programs on the discrete NVIDIA GPU, while X was handled by the integrated Intel GPU, to prevent kernel execution timeout. Why doesn't the Intel HD Graphics 3000 GPU show up? Any tests I could make to verify the presence of an integrated GPU?

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  • Applications affected by memory performance

    - by robotron
    I'm writing a paper on the topic of applications affected more by memory performance than processor performance. I've got a lot written regarding the gap between the two, however I can't seem to find anything about the applications that might be affected more by memory performance than by processor speed. I suppose these are applications that make a large amount of memory references, but I have no idea what kind of applications would make such large number of references to make it stand out? Perhaps databases? Can you please give me any pointers on how to proceed, some links to papers? I'm really stuck.

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  • DIY Photo Rig Takes Laser-Triggered 3D Insect Photos

    - by Jason Fitzpatrick
    How do you catch a butterfly in flight and in 3D? You do it with this laser triggered photo rig. This it yourself monster is an absolute beauty of at-home engineering. It has dual focus planes, dual flashes, a laser trigger, and enough machined aluminum to make us wish we had a CNC out in the garage. If you’re one part photographer, one part electronics tinker, and one part machinist, this is the kind of weekend project that will cement you into neighborhood DIY lore. Hit up the link below for a full build guide and sample photos. High-Speed 3D Portable Macro Unit [via DIY Photography] How to Make the Kindle Fire Silk Browser *Actually* Fast! Amazon’s New Kindle Fire Tablet: the How-To Geek Review HTG Explains: How Hackers Take Over Web Sites with SQL Injection / DDoS

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  • gstreamer vaapi problem

    - by squallbayu
    I installed gstreamer-vaapi from this PPA : ppa:guido-iodice/video sudo apt-get install gstreamer0.10-vaapi libgstvaapi-x11-0 libgstvaapi0 but, if I run totem movie player (via terminal) it's show this error : (totem:3383): GLib-GObject-WARNING **: g_object_set_valist: object class 'TotemScrsaver' has no property named 'reason' (totem:3383): GLib-GObject-WARNING **: value "10752000" of type 'guint' is invalid or out of range for property 'connection-speed' of type 'guint' libva: libva version 0.31.0 Xlib: extension "XFree86-DRI" missing on display ":0.0". libva: va_getDriverName() returns 0 libva: Trying to open /usr/lib/dri/nvidia_drv_video.so libva error: /usr/lib/dri/nvidia_drv_video.so init failed libva: va_openDriver() returns -1 Segmentation fault It's seems I get wrong nvidia_drv_video.so. What should I do? If I uninstall it, it's work fine, but I want to use this vaapi backend for my video decoding via GPU while I run gstreamer based apps. PS : I use Ubuntu Lucid 64bit and MSI CR 400 Notebook : Intel Core 2 Duo Nvidia 8200M

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