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  • The Singleton Pattern

    - by Darren Young
    Hi, I am a new programmer (4 months into my first job) and have recently taken an interest in design patterns. One that I have used recently is the Singleton. However, looking at some comments on this thread Overused or abused programming techniques .......it has some bad feedback. Come somebody explain why? I have found it useful in some places, however I could probably have achieved the same without it using a static class. Thanks.

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  • i cant use ubuntu software manager

    - by hossein
    It's the first time that I use ubuntu and I can't use the ubuntu software manager, when I type update codes in terminal it shows this error Reading package lists... Error! W: GPG error: http://ir.archive.ubuntu.com precise Release: The following signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key <[email protected]> E: Encountered a section with no Package: header E: Problem with MergeList /var/lib/apt/lists/ir.archive.ubuntu.com_ubuntu_dists_precise_main_binary-i386_Packages E: The package lists or status file could not be parsed or opened.

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  • BCM 4306 not recognized after upgrade on a Dell Latitude D600

    - by Brian Eisemann
    This is extremely frustrating to me. I had the wireless card working before I upgraded to 11.10. At first the wireless device was recognized but it told me there was no firmware, so I went ahead and went through the process I did before of installing the b43/b43legacy firmware, and now my wireless device is not even recognized, or showing up anywhere! 02:03.0 Network controller [0280]: Broadcom Corporation BCM4306 802.11a/b/g [14e4:4324] (rev 03)

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  • How does rc job work / order of (contradicting) "start on ..." and "stop on ..." stanzas

    - by Binarus
    Hi, I just can't understand how Upstart's rc job definition in Natty 11.04 works. To illustrate the problem, here is the definition (empty lines and comments are left out): start on runlevel [0123456] stop on runlevel [!$RUNLEVEL] export RUNLEVEL export PREVLEVEL console output env INIT_VERBOSE task exec /etc/init.d/rc $RUNLEVEL Let's suppose we currently are in runlevel 2 and the rc job is stopped (that is exactly the situation after booting my box and logging in via SSH). Now, let's assume that the system switches to runlevel 3, for example due to a command like "telinit 3" given by root. What will happen to the rc job? Obviously, the rc job will be started since it is currently stopped and the event runlevel 3 is matching the start events. But from now on, things are unclear to me: According to the manual $RUNLEVEL evaluates to the new runlevel when the job is started (that means 3 in our example). Therefore, the next stanza "stop on runlevel [!$RUNLEVEL]" translates to "stop on runlevel [!3]"; that means we have a first stanza which will trigger the job, but the second stanza will never stop the job and seems to be useless. Since I know that the Ubuntu / Upstart people won't do useless things, I must be heavily misunderstanding something. I would be grateful for any explanation. While trying to understand this, an additional question came to my mind. If I had contradicting start and stop triggers, for example start on foo stop on foo what would happen? I swear I never will do that, but I am nevertheless very interested in how Upstart handles that on the theoretical level. Thank you very much! Editing the question as a reaction on geekosaur's first answer: I can see the parallelism, but it is not that easy (at least, not to me). Let's assume the job aurrently is still running, and a new runlevel event comes in (of course, the new runlevel is different from the current one). Then, the following should happen: 1) The job is single instance. That means that "start on ..." won't be triggered since the job is currently running; $RUNLEVEL is not touched. 2) "stop on ..." will be triggered since the new runlevel is different from $RUNLEVEL, so the job will be aborted. 3) Now, the job is stopped and waiting. I can't see how it is restarted with the new runlevel. AFAIK, initctl emits events only once, so "start on ..." won't be triggered and the new runlevel won't be entered. I know that I still misunderstanding something, and I am grateful for explanations. Thank you very much!

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  • Seven SEO Mistakes to Avoid

    SEO seems relatively easy at first, but danger lurks around every corner. One false step and all of your SEO work vanishes into a de-indexing or the dreaded Google sandbox. In this article, we'll explore the seven SEO mistakes to avoid.

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  • Cant install 12.04.1 or 12.10 in Asus GT75VW laptop

    - by Software companies in perth
    I got this new laptop that comes with a 256 GB ssd drive 128 GB are used for the preinstalled Windows 7 I want to install Ubuntu on the other 128 Gb. I first installed 12.10, it worked and booted once into the OS bu then it started booting onto a black screen so i tried with 12.04.1, i tried installing it a few times with the normal and alternate installer but after saying the installation was OK, it boots onto this distorted graphics screen with a purpelish background where you can't do anything.... What do i do?

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  • Protect and Improve your Software with SmartAssembly 5

    - by Bart Read
    SmartAssembly 5 has been released. You can download a 14-day fully-functional free trial from: http://www.red-gate.com/products/smartassembly/index.htm This is the first major release since Red Gate acquired the tool last year, and our focus has mainly been on improving the quality of an already great tool. We've also simplified the licensing model so that there are now only three editions: Standard - bullet-proof protection at a bargain price, Pro - includes the SDK & custom web server...(read more)

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  • best command line tool to join videos

    - by user1079002
    I have used ffmpeg, but with it you have to first make mpg videos then do cat video1.mpg video2.mpg > joined.mpg and then convert to joined.mpg to joined.mp4 with ffmpeg to be able to upload on youtube. I heard there's mencoder which can join avi files without converting to mpg and using cat command. I'm making videos to upload on youtube so it needs to be avi mp4 or flv format. Which tool is the best to join videos from command line?

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  • Chrome in the launcher does not open with keyboard hotkey (Super + #)

    - by Jin
    I'm running Ubuntu 14.04 LTS and I have chrome as the first application locked in my launcher. When I click it or press Super+1 the Chrome icon just flashes, but never opens the app. All other apps open fine. I have to manually find it in Unity and launch it from there, or from Terminal. I've set this to launch properly on another machine but I don't know why it's not working on my laptop. Why does this happen?

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  • Is there any officially recognized, specific determinants that make a language programming/scripting?

    - by Dan
    I remember when I was first learning web-based programming everyone was intent on JavaScript not being a "programming language," but rather a scripting language; I have not heard that argument in quite a while now. I hear a lot of languages, like perl for example, referred to at different times as both a scripting and programming language. I know that a scripting language is less capable than a programming language, but where exactly does the line lie? Citation would be appreciated.

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  • Where to find my website's source code?

    - by Aamir Berni
    my company ordered a website and we were given all usernames and passwords but I can't find the PHP source files and this is my first website assignment. I have no prior exposure to web technologies although I've been programming for a decade and know computer usage inside out. I tried to use the cPanel to find .php files but there aren't any. There are no MySQL databases either. I'm lost. I'll appreciate any help in this regards.

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  • xubuntu 12.04 slow boot

    - by user76390
    my xubuntu 12.04 fresh installed boots in more than 30 seconds, here the first big gap in dmesg: [ 1.984795] firewire_core: created device fw0: GUID 000ae4060034203a, S400 [ 2.336568] EXT4-fs (sda1): mounted filesystem with ordered data mode. Opts: (null) [ 15.465275] ADDRCONF(NETDEV_UP): eth0: link is not ready [ 15.503348] udevd[331]: starting version 175 once booted everything works fine (networks included) thanks for help!

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  • Picasa 3.9 login fails with 2-factor authentication

    - by Paul Pomes
    I've installed Picasa 3.9 via the instructions at webupd8, however the login window keeps failing with the message, "You must be connected to the Internet to use this feature." If "Try again" is tried I'll successfully pass the first login screen of username and password. Next I'm prompted for the verification code which then takes me back to the "You must be connected to the Internet to use this feature" screen again.

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  • Questions about identifying the components in MVC

    - by luiscubal
    I'm currently developing an client-server application in node.js, Express, mustache and MySQL. However, I believe this question should be mostly language and framework agnostic. This is the first time I'm doing a real MVC application and I'm having trouble deciding exactly what means each component. (I've done web applications that could perhaps be called MVC before, but I wouldn't confidently refer to them as such) I have a server.js that ties the whole application together. It does initialization of all other components (including the database connection, and what I think are the "models" and the "views"), receiving HTTP requests and deciding which "views" to use. Does this mean that my server.js file is the controller? Or am I mixing code that doesn't belong there? What components should I break the server.js file into? Some examples of code that's in the server.js file: var connection = mysql.createConnection({ host : 'localhost', user : 'root', password : 'sqlrevenge', database : 'blog' }); //... app.get("/login", function (req, res) { //Function handles a GET request for login forms if (process.env.NODE_ENV == 'DEVELOPMENT') { mu.clearCache(); } session.session_from_request(connection, req, function (err, session) { if (err) { console.log('index.js session error', err); session = null; } login_view.html(res, user_model, post_model, session, mu); //I named my view functions "html" for the case I might want to add other output types (such as a JSON API), or should I opt for completely separate views then? }); }); I have another file that belongs named session.js. It receives a cookies object, reads the stored data to decide if it's a valid user session or not. It also includes a function named login that does change the value of cookies. First, I thought it would be part of the controller, since it kind of dealt with user input and supplied data to the models. Then, I thought that maybe it was a model since it dealt with the application data/database and the data it supplies is used by views. Now, I'm even wondering if it could be considered a View, since it outputs data (cookies are part of HTTP headers, which are output)

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  • Missed The Latest OPN Partnercast?

    - by Roxana Babiciu
    Don’t miss the replays. Patrick Ty, Director of Partner Enablement for CX discusses the advantages of Oracle’s Marketing Automation solutions. First, watch his interview with Neil Wilson, Vice President of Global Alliances & Channels, on Oracle Eloqua Marketing Automation. Then, see his conversation with David Lewis, the Founder and CEO of DemandGen International Inc., covering Marketing Automation best practices for partners.

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  • Linux Under The Spotlight As We Prepare For A Chaos Bound National Elections

    <b>Tech Source:</b> "With less than a few days to go before the Philippines will hold its first ever fully automated national elections, it seems like we're in for a really bumpy ride. Serious, embarrassing, and idiotic technical glitches were discovered while testing the Precinct Count Optical Scan (PCOS) machines that will be used to count votes for the polls."

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  • How to change FAT32 sort order on drive?

    - by Chad--24216
    I use a USB drive to play music in my car. Unfortunately, the car does not sort the music alphabetically and relies on how the music is sorted on the FAT32 drive. This Windows software here solves the problem. Anything comparable available for me on Ubuntu? PS: at first I thought it was a file creation date problem askubuntu question. But although I figured out the answer to that question, it didn't solve the problem like I thought it would.

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  • Migrating from OCS 2007 R2 to Lync: Part 2

    In the story so far, Johan has described how to check that the migration from your OCS to Lync is supported and how to determine the requirements for the new installation This was followed by a walk-through of the preparation the Active Directory and installation of the first Lync Front End Server with a Mediation Server co-located. Now Johan tackles the merging the OCS configuration, and connection to the outsode world, followed by testing, performing and then validating the migration.

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  • Recording for the JVM Diagnostics & Configuration Management sessions

    - by ablyth
    Hi All The middleware team have posted recordings of their first 2 sessions from the iDemo series they are running ( MiddlewareTechTalk Blog). Check them out below! Please download the recording from the following links. Troubleshoot Java Memory Leaks with Oracle JVM Diagnostics9 June 2011, 2:04 pm Sydney Time, 53 mins Manage WebLogic Servers by Oracle Enterprise Manager & Configuration Manager16 June 2011, 1:59 pm Sydney Time, 49 minutes Cheers Alex

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  • Adding a SQL Server Membership Provider using the aspnet_regsql.exe Utility

    - by nannette
    You may add a SQL Server Membership Provider using the aspnet_regsql.exe Utility on either your SQL Server Express local database or on a full-blown SQL Server database . In both implementations, you would use the aspnet_regsql.exe utility. This tool is installed when you install your .NET Framework. To use this on your SQL Server 2008 database server, for instance, you would need to first download and install the .NET Framework onto your server. Then you would need to find the location of the aspnet_regsql...(read more)

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  • Best Language for the job? Database | C++, .NET, Java

    - by Randy E
    Ok, quick overview. I'm pretty brand new to software design. I have experience reading and editing/customizing PHP things for online scripts/software; Such as CMS, Wordpress, some forum solutions. I'm about to begin my degree in Software Design, the school I'm going to will allow us to kind of focus on an area, C++, Java, or .NET. I've played around a little with VB over the past week, mostly just trying to get a slight feel for it, however nothing extensive. I've been through Herbert Schildt's "C++, A Beginner's Guide." but I was mainly reading it, not doing anything with it beyond a couple basic Console Apps (and getting frustrated with auto-close :/ ). Now, where I decide to focus more in with my degree will depend on what the best language for the job is for my first piece of software I want to develop on my own. Assume I haven't looked at any of the languages at all, please help with the following: My first piece of software will be a database program. Everything has to do with users inputting and retrieving data, and calling that data to help with another function of the software, automatically calculating billing information based on information inputted in the other portion of the program. I won't go into too many details as I'm targeting a niche that doesn't have too much competition, but the competition that is there is established. I want to offer more features, scalable solutions, and the ability to port it to an online version. Ok, basically, it is a complete case management with integrated billing for Private Investigators. I would like the case management to be able to check the Database to see if certain information has been inputted before (such as Names/SSN's), and then the billing will pull hours inputted in the case portion for investigative work, multiplying by an already inputted amount for the fee, and then calculate sales tax. I also want to provide potential clients with an easily scalable solution, that is, a basic option for start ups that costs the least amount, with no additional users, ran on one machine. A middle option with the ability to create users and place them in two groups (User or Admin), as well as adding a few additional features, ran on one machine, but this will allow it to be accessed after being mapped on a network drive. And a third option to allow the placement into 4 different groups (Investigators, Billing, Managers, Admins) and more features. And then, a couple of years after launch, a 4th option that is browser based allowing the same 4 groups to login, as well as clients (view things concerning their case, with some admin customizable objects that can be added for clients view), over the internet. The only licensing security I would like to employ right off the bat will be serial key generated after ordering online (received in an email after the successful purchase). The program will access a database stored on a server periodically to verify license. I would like it to be able to check to make sure it's the most updated version and automatically update if not.

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  • Best Guide To Doing On Page SEO

    If you want your website to start dominating the search engines for certain keywords, the first step is doing On Page SEO. The fact is that if your own website is not correctly optimised for keywords... [Author: Martin Sejas - Web Design and Development - April 10, 2010]

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  • SQL Server Begin Try

    - by Derek Dieter
    The try catch methodology of programming is a great innovation for SQL 2005+. The first question you should ask yourself before using Try/Catch should be “why?”. Why am I going to use Try/Catch? Personally, I have found a few uses, however I must say I do fall into the category of not [...]

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