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  • Should concrete classes avoid calling other concrete classes, except for data objects?

    - by Kazark
    In Appendix A to The Art of Unit Testing, Roy Osherove, speaking about ways to write testable code from the start, says, An abstract class shouldn't call concrete classes, and concerete classes shouldn't call concrete classes either, unless they're data objects (objects holding data, with no behavior). (259) The first half of the sentence is simply Dependency Inversion from SOLID. The second half seems rather extreme to me. That means that every time I'm going to write a class that isn't a simple data structure, which is most classes, I should write an interface or abstract class first, right? Is it really worthwhile to go that far in defining abstract classes an interfaces? Can anyone explain why in more detail, or refute it in spite of its benefit for testability?

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  • What is testable code?

    - by Michael Freidgeim
    We are improving quality of code and trying to develop more unit tests. The question that developers asked  was  "How to make code testable ?"  From http://openmymind.net/2010/8/17/Write-testable-code-even-if-you-dont-write-tests/ First and foremost, its loosely coupled, taking advantage of dependency injection (and auto-wiring), composition and interface-programming. Testable code is also readable - meaning it leverages single responsibility principle and Liskov substitution principle.A few practical suggestions are listed in http://misko.hevery.com/code-reviewers-guide/More recommendations are in http://googletesting.blogspot.com/2008/08/by-miko-hevery-so-you-decided-to.htmlIt is slightly too theoretical - " the trick is translating these abstract concepts into concrete decisions in your code."

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  • Can I use a desktop as a network server?

    - by Jhourlad Estrella
    Pardon me if I'm asking the wrong question. But I am a newbie in networking and I'm not sure what direction to go on this. I have just setup an Ubuntu Desktop. I am planning to convert it to a network server without losing the GUI interface (again, I'm a newbie) and use it to manage and monitor user access to a network with a small number of network terminals all running on Windows. My purpose is to use the new server to filter sites accessed by each terminals, monitor sites being visited by employees and grant access to both group and user-specific folders based on their IP address. Is this possible? What server software do I need to install? How do I structure the hardware? (I have a router, a hub, the Ubuntu server and the network terminals) How do I assign privileges to users and monitor them at the same time? Thank you in advance for your replies.

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  • How to use PostgreSQL on AWS - Ubuntu 11.10

    - by That1Guy
    I'm extremely new to cloud-computing, Linux, and PostgreSQL, so if this is a stupid question, I apologize. I've managed to create an m1.large instance running Ubuntu 11.10, connect via Putty SSH, and install PostgreSQL (sudo apt-get install postgresql), but that is as far as I've gotten. My goal is to run several python web-scraping scripts that I've written on this instance (so as not to eat up all of our bandwidth (smaller company at the moment)) and insert the scraped data into a PostgreSQL table on the instance and later retrieve that data to store on our local server (as I've heard AWS EBS is unreliable and I don't want to take chances). How can I configure PostgreSQL on my AWS instance? How can I access the data from my machine? I currently use PgAdmin3 to manage PosgreSQL on our local server. Can I use this same interface to manage PostgreSQL on my AWS instance? Any suggestions, solutions, links, etc is greatly appreciated. And again, if this is a dumb question, I apologize.

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  • How to support tableless columns with WYSIWYG editor?

    - by Andy
    On the front page of a site I'm working on there's a small slideshow. It's not for pictures in particular, any content can go in, and I'm currently setting up the editing interface for the client. I'd like to be able to have one/two/more columns in the editable area, and ideally that would be via CSS - does anyone know of a WYSIWYG editor that supports this? I'm using Drupal (would prefer not to involve Panels as it would require a bit of work to make it a streamlined workflow for content entry) in case that matters to anyone. To start the ball rolling, one way would be to use templates. I know CKEditor supports templates, and it looks like TinyMCE might have something similar. I don't know how well these work with tableless columns (the CKEditor homepage demo uses tables to achieve its two column effect). Holding out for a cool solution!

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  • How to solve cyclic dependencies in a visitor pattern

    - by Benjamin Rogge
    When programming at work we now and then face a problem with visitors and module/project dependencies. Say you have a class A in a module X. And there are subclasses B and C in module Y. That means that module Y is dependent on module X. If we want to implement a visitor pattern to the class hierarchy, thus introducing an interface with the handle Operations and an abstract accept method in A, we get a dependency from module Y to module X, which we cannot allow for architectural reasons. What we do is, use a direct comparison of the types (i.e. instanceof, since we program in Java), which is not satisfying. My question(s) would be: Do you encounter this kind of problem in your daily work (or do we make poor architectural choices) and if so, how is your approach to solve this?

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  • Windows Phone : Nokia et Microsoft organisent de nouvelles formations gratuites partout en France d'avril à mai

    Windows Phone : Nokia et Microsoft organisent de nouvelles formations gratuites Un peu partout en France d'avril à mai Le Team Nokia repart sur les routes de France pour un second Road Show sur Windows Phone 7.5. Pour cette nouvelle édition, deux niveaux de formation seront proposés. Le « Level 1 » permettra de découvrir Mango (interface Metro, Live Tile, notifications?). Elle abordera également l'utilisation du SDK 7.1, le Marketplace et l'AppHub pour la monétisation et la publication des applications. Le « Level 2 » s'adressera lui aux développeurs connaissant déjà les bases du développement pour Mango. Y seront détaillées les bonnes pratiques...

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  • How to set Ubuntu as wireless accespoint in the GUI way?

    - by Agmenor
    My aim is to make my Ubuntu machine be a wireless accesspoint using wifi. Of course I found two AskUbuntu questions already treating that; this one and that one. Nevertheless, as far as I am concerned I would like to set up such a network in the Graphical User Interface (GUI) way. Please avoid solutions with the command line. So a solution suggesting to use Network Manager would be really welcomed. Please name and describe very precisely each step, so I can easily find the equivalent in my own language. Thank you for your answers!

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  • Writing a desktop application for progammer from PHP background

    - by Mark
    I have a client who wants a tool for him to be able to upload his products, enter orders, and keep track of customer details. There are quite a few highly customised requests, which is why he wants the tool custum made. He does not care much about the interface design - it just has to be usable and provide access to the databade. I've already designed the database. I have no experience of desktop applications and usually write my web apps in PHP with the Yii framework. But hosting this on a server seems like overkill. I also have .net experience from a few years ago. What would be the best options for writing this as a desktop application?

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  • Unix as opposed to Windows (Java and C++)

    - by user997112
    Firstly I should explain the background. I am interested in high frequency trading programming roles. After looking at many job specs it is very clear that there is a big demand for programmers who have programmed Java and C++ on Unix as opposed to Windows. My question is what are the differences a High Freq programmer would come across? It cannot be something in the language itself because syntactically they do not differ over OS? Therefore I thought it must be something which the programming language has to interface, resources etc? Could anyone please help me out as I am trying to improve my C++/Java on Unix, in order to aim for this type of career? ps I'm guessing part of this answer lies with the socket infrastructure on Unix?

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  • How can I get a 1920x1080 resolution?

    - by Sam T.
    I a newbie Linux and have just installed Ubuntu in a dual boot with Windows 7. I love the interface of Ubuntu but unfortunately I can only get a 800x600 or 1024x728 resolution with black bars all around the screen. I have an nVidia GTX 570 graphics card and an Asus 1080p 23" monitor. What may be of note is that I had to use the nomodeset command on installation of the boot would get stuck at a line with "nouveau", which I understand is to do with the drivers. Additionally, when I type in xrandr to the terminal, it comes up with the error message "failed to get size of gamma for output default". I guess what I am looking for here is someone who could explain to me really simply the steps I have to take to get a full 1080p resolution, at which point I am sure i will become a great fan of the OS! Thanks in advance, Sam T.

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  • Am I getting paid a reasonable wage for web engineering?

    - by sailtheworld
    I've been doing some research and it looks like most people in my line of work - WEB ENGINEERING/WEB APPLICATION DEVELOPMENT - that get paid hourly, make anywhere from $30-80 an hour for their work. With that said, I have SEVEN years of experience with web development including OOP-PHP, MySQL, jQuery, OOP-JS, interface design, ajax, database architecture, etc. I am also very strong with visual design and workflow - thus, I've made some really high quality interactive interfaces. I also have a lot of experience with Zend Framework, Symfony, Wordpress, Drupal, etc and a really strong portfolio to show for it. Here's the catch: I'm 20 years old, haven't graduated from college yet (I'm doing part time school and ~30 hours a week of web development.) But I've literally been doing web apps since I was 13 years old. So my question is: is $14 an hour a reasonable starting wage for working at a company part time?

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  • Where do I set my SPF record?

    - by Misha
    Many years ago we purchased a domain from Yahoo. Now our website is hosted on Amazon EC2. The output of an SPF checking tool (http://www.kitterman.com/getspf2.py) says SPF records are primarily published in DNS as TXT records. The TXT records found for your domain are: i=182&m=bizmail-mx2-p9 SPF records should also be published in DNS as type SPF records. No type SPF records found. Checking to see if there is a valid SPF record. No valid SPF record found of either type TXT or type SPF. Where do I get access to these values? Can somebody speculate, where can I find an interface, or a configuration file to fill in the missing fields?

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  • Weird issue with iptables redirection

    - by skypemesm
    I am trying to redirect all incoming traffic on UDP port 5060 to port 56790, and all outgoing traffic from 5060 to the port 56789. I used these iptables rules: iptables -t nat -I PREROUTING -p udp ! -s localhost --dport 5060 -j REDIRECT --to-port 56790 iptables -t nat -I OUTPUT -p udp ! -s localhost --sport 5060 -j REDIRECT --to-port 56789 I listen on both ports using RAW SOCKETS after setting the interface to PROMISCUOUS mode using ioctl. I see packets ONLY on 56789 i.e.SENDING side, and I do not see any packets on 56790, while wireshark shows that many packets are delivered to port 5060. Why would this happen? Any ideas? Do you think it's a problem with iptables rules or something to do with raw sockets? [This is ubuntu 10.04 and iptables v1.4.4]

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  • How to improve Unity Performance?

    - by Wolter Hellmund
    I installed ubuntu netbook edition on my netbook* expecting to get the best performance out of it, but apparently, that didn't turn out. Unity is a bit slow on it, and when I click on Files and folders it takes a while to load the respective interface and the bar at the top disappears and then loads in. Is this expected? Is there anything I can do to improve the performance? Is this problem specific to my netbook? *Netbook info: Acer - Aspire One 1.6 GHz Intel Atom Processor 1 GB RAM Memory Intel GMA 950 graphics card

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  • MammothVPS launches Backups, DNS Management and more!!!

    - by stefan.sedich
    Yesterday we launched a bunch of new features over at MammothVPS, - All VPS' now have an on-site, off-server backup facility available to them. By default all customers will have 1 free weekly backup made available to them, and should you wish to you can purchase more slots which are available in daily, weekly and monthly schedules. - DNS hosting has been made available and will be free for all customers. You can find the new interface in your mPanel. - A cleanup of the menu system has been done to make it easier to navigate around both the site and mPanel. - You will find new sections on site, we now have more information about our services and have included things like a Knowledge Base, which will provide information on howto setup various applications on your VPS. - Added the ability to change the kernel your VPS is running on. So head on over to MammothVPS and check it out.

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  • Complete Beginner to Game Programming and Unreal Engine 4, Looking For Advice [on hold]

    - by onemic
    I am currently a 2nd year programming student(Just finished my first year so I will be starting my second year in September) and have mainly learned C and C++ in my classes. In terms of what I know of C++, I know about general inheritance, polymorphism, overloading operators, iterators, a little bit about templates(only class and function templates) etc. but not of the more advanced topics like linked lists and other sequential containers(containers in general I guess), enumerations, most of the standard library(other than like strings and vectors), and probably a bunch of other stuff I dont even know about yet. I subscribed to Unreal Engine 4 as I was very intrigued by their Unreal Tournament announcement earlier this month, especially after hearing that UE4 is going completely C++. Of course my end goal in doing this programming program is to eventually go into game/graphics programming. Since it's my summer off, I thought what better way then to actually apply some of my skills to a personal project so I actually have a firmer understanding of C++ past what my professors tell me. My questions are this: What would be the best way to start off making a small personal game in UE4 as a project for the summer? What should I be aiming for, especially for someone that is still learning C++? Should I focus on making a simple 2D game rather than a 3D one to get started? Seeing the Flappy Chicken showcase intrigued me because before I thought the UE engine was pretty much pigeonholed into being for FPS games What should my expectations be going into UE4 and a game engine for the first time?(UE4 will be my first foray into making a game) What can I expect to gain from making things in UE4, in terms of making games and in terms of further fleshing out my knowledge of C++? Would you recommend I start off 100% using C++ for scripting or using the visual blueprints? Since I'm not a designer, how would I be able to add objects and designs to my game? For someone at my level is retaining the UE4 subscription worth it or is it better to cancel and resub when I learn enough about UE4 and C++? Lastly is there anything to be gained in terms of knowledge/insight through me looking at the source code for UE4? I opened it in VS2013, but noticed that most of the files were C# files and not cpp's. Thanks in advance for taking the time to answer.

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  • Internet Explorer 10 bientôt disponible pour Windows 7, Microsoft annonce la sortie d'une préversion en novembre

    Internet Explorer 10 bientôt disponible pour Windows 7, Microsoft annonce la sortie d'une préversion en novembre Les utilisateurs de Windows 7 pourront télécharger une préversion d'Internet Explorer 10 à partir de mi-novembre. IE 10 est la prochaine mise à jour majeure du navigateur de Microsoft qui sera disponible en version finale au même moment que Windows 8 annoncé pour le 26 octobre prochain. Cette version se distingue essentiellement par sa nouvelle interface qui repose sur les tuiles Windows 8 et le support de la navigation tactile. Le navigateur dispose de nouvelles capacités de développement et de performances améliorées grâce à l'accélération matérielle. M...

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  • Gnome 3 Shell extensions not working on Ubuntu 12.4 [closed]

    - by user63960
    Possible Duplicate: Gnome Shell Extension Empty I just upgraded to Ubuntu 12.4 running on a Win 7 box via VBox and switched the user interface to Gnome 3 but have a problem. In Advanced Settings (gnome tweak), the Shell Extensions window has no listings and the Theme window shows a "caution" triangle next to the Shell theme drop box. I have re-installed the default extensions using the Noobs Lab posted instructions: sudo apt-get install shell-extensions3.4 sudo apt-get install gnome-shell-extensions The commands appear to complete without error. Symptoms are: Gnome 2 visual appearance and no window borders or controls. To close a window, I have to click the window indicator in the sys tray and select the close menu item. Any ideas?

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  • How to set up an ethernet and wireless network using /etc/network/interfaces?

    - by den-javamaniac
    Hi. Currently I have ethernet and wireless networks configured through a network manager (further NM) but it seems to be a bit buggy (I need a different MAC for ether which is never applied if using NM), so I would like to move all the network configs to interfaces file. I know (or can google for) configuration code, but I'm not sure how NM works and it looks like it overrides interface config. Please advice, how I can handle this issue. NOTE: I also would like to be able to locate and connect to various wireless networks but not sure how to do it.

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  • Windows 8 : PayPal publie une API pour le paiement in-app, sortie d'une flopée d'applications dont Dropbox, Twitter, ESPN

    Windows 8 : PayPal publie une API pour le paiement in-app sortie d'une flopée d'applications dont Dropbox, Twitter, ESPN PayPal vient de sortir son API pour Windows 8. L'interface de programmation de la société permettra aux développeurs d'intégrer des moyens de paiement dans leurs applications Windows 8. Parmi les différents modes de monétisation dont supporte l'API, on va noter la présence du paiement in-app qui a été mis en avant par Microsoft. Cette option permettra aux développeurs de facturer des mises à jour, des fonctionnalités additionnelles ou encore les contenus d'une application. À titre d'exemple, Microsoft cite le jeu Crowdstar "Fish wit...

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  • What software is responsible for connecting to the wireless net specified in /etc/network/interfaces?

    - by zuba
    I'm curious what software (package, utility in bin's) handle interface parameters in /etc/network/interfaces and decides to connect to the specified wireless net. I use wifi usb stick dlink DWL-110 attached to wlan0 with ndiswrapper driver. Sometimes wlan0 sees my wifi net - iwlist wlan0 scan shows it, but does not connect to it - iwconfig shows AP Not-Associated, until I replug the stick. Neither reinserting module with ndiswrapper, not ifdown/ifup or restarting networking helps. That is why I need to know what OS entity handles connection/reconnection to wireless net. EDIT: shame on me, I use wireless-tool package with wep encryption

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  • Telerik Q1 2010 Release Enhances Productivity Throughout .NET Toolbox

    Entire product portfolio now supports Microsoft Visual Studio 2010 RC Waltham, MA, March 10, 2010 Telerik, a leading vendor of development tools and user interface components for .NET, announced today their Q1 2010 release, consisting of a complete update of the Telerik .NET developer toolbox and the official release of Telerik Extensions for ASP.NET MVC and JustCode. This release is further marked by significant performance innovations in the companys Silverlight and WPF UI controls, full support...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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  • Telerik Q1 2010 Release Enhances Productivity Throughout .NET Toolbox

    Entire product portfolio now supports Microsoft Visual Studio 2010 RC Waltham, MA, March 10, 2010 Telerik, a leading vendor of development tools and user interface components for .NET, announced today their Q1 2010 release, consisting of a complete update of the Telerik .NET developer toolbox and the official release of Telerik Extensions for ASP.NET MVC and JustCode. This release is further marked by significant performance innovations in the companys Silverlight and WPF UI controls, full support...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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  • How can set up a file sharing server to allow remote access over a WAN?

    - by pst007x
    I want to set up a server to allow remote access over a WAN. The purpose is to allow people to remote connect and download specific files from a specified folder hosted on the server. Is there software available to achieve this, preferably with an interface so I can easily add and remove users, plus monitor who is connected at any time? I have looked around and only found terminal references, and not very clear how to set up. I have a service running on my Win server, but I am hoping to move from that to Ubuntu for my file sharing. I do not want people who access the server to have any local accounts or any access to any folder/files apart from authorised folders/files. Thanks

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