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Articles indexed in September 2012

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• ASP.NET design not SOLID

  - by w0051977

  SOLID principles are described here: http://en.wikipedia.org/wiki/SOLID_%28object-oriented_design%29 I am developing a large ASP.NET app. The previous developer created a few very large classes each with lots of different purposes. It is very difficult to maintain and extend. The classes are deployed to the web server along with the code behind files etc. I want to share a small amount of the app with another application. I am considering moving all of the classes of the ASP.NET web app to a DLL, so the small subset of functionality can be shared. I realise it would be better to only share the classes which contain code to be shared but because of the dependencies this is proving to be very difficult e.g. class A contains code that should be shared, however class A contains references to classes B, C, D, E, F, G etc, so class A cannot be shared on its own. I am planning to refactor the code in the future. As a temporary solution I am planning to convert all the classes into a single class library. Is this a bad idea and if so, is there an alternative? as I don't have time to refactor at the moment.

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• Is shipping a Clojure desktop app realistic?

  - by Cedric Martin

  I'm currently shipping a desktop Java application. It is a plain old Java 5 Java / Swing app and so far everything worked nicely. Java 5 was targetted because some users were on OS X version / computers that shall never have Java 6 (we may lift this limitation soon and switch to a newer Java and simply abandoning my users stuck with Java 5). I'm quickly getting up to speed with Clojure but I haven't really done lots of Clojure-to-Java and Java-to-Clojure yet and I was wondering if it was realistic to ship a Clojure desktop application instead of a Java application? The application I'm shipping is currently about 12 MB with all the .jar so adding Clojure doesn't seen to be too much of an issue. My plan would be to have Clojure call Java APIs: my application is already divided in several independent jars. If I understand correctly calling Clojure from Java is harder than calling Java code from Clojure which is why I'd basically rewrite all the UI (part of the UI, mixing Swing components and self-made BufferedImages needs to be rewritten anyway due to the rise of retina display), and do all the 'wiring' from Clojure. So that's the problem I'm facing: is it realistic to ship a Clojure desktop app? (it certainly doesn't seem to be very widespread but then shipping plain Java desktop apps ain't that common either and I'm doing it anyway) Technically, what would need to be done? (compared to shipping a Java app)

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• Convincing Upper Management the need of larger monitors for Developers

  - by The Rubber Duck

  The company I work for has recently hired on several developers, and there are a limited number of monitors to go around. There are two types in the office - a standard 15" (thankfully flatscreen) and a widescreen 23". No developer has a machine capable of a dual monitor setup, and the largest monitors went to the people who got here first. Three or four new senior level developers only have a 15" monitor to work on. To make matters worse, there are perhaps a total of 25-30 DBAs/Testers/Admin types in the company who all have dual screen 23" setups. We have brought the issue to management, and they refuse to take away large monitors from people who have been here for years for the sake of new employees, even if they are senior level. We have pitched the idea of testers sacrificing a large monitor for one of our small ones, but they won't go for that either. What can I say to management to illustrate the need of monitors for developers?

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• What benefits can I get upgrading my ASP.NET (Webform) + DAL(EF) + Repository + BLL structure to MVC?

  - by Etienne

  I'm in the process of defining an approach that may best fit our needs for a big web application development. For now, I'm thinking going with an ASP.NET Architecture with a DAL using Entity Framework, a Repository concept to not access DAL directly from BLL and a BLL that call the repository and make every manipulations necessary to prepare data to push in a presentation layer (.aspx files). I don't plan to use ASP.Net controls and prefer to keep things simple and lightweight using plain html, jQuery UI controls and do most of the server calls with jQuery Ajax. Sometimes, when needed, I plan to use handlers (.ashx) to call BLL methods that will return JSON or HTML to client for dynamic stuff. My solution also has a test project that Mock the Repository with in-memory data to not repose on database for testing BLL methods... It may be usefull to add that we will build a big application over this architecture with hundreds of tables and store procedures with a lot of reading and writing to database. My question is, having this architecture in mind, Is there any evident advantages that I can obtain by using an MVC3 project instead of the described architecture base on Webform? Do you see any problem in this architecture that may cause us problem during the next steps of development? I know the MVC pattern for using it in others projects with Django... but the Microsoft MVC implementation look so much more complex and verbose than Django MVC and it's why I'm hesitating (or waiting for a little push?) right now before jumping into it... We are in a real project with deadlines and don't want to slow the development process without any real benefits.

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• Kindle Screen as Informational Display (weather, unread emails, calendar)

  - by coder543

  I'm looking to create a type of homepage for my kindle like you might expect to see upon waking up (though realistically, I plan on using it as a secondary screen throughout the day) whereupon it shows you several things dividing the screen, but not being scrollable. I just want the summary to fill the screen of the web browser. It would show the weather my gmail inbox my calendar for the day maybe some tech news However, as a starting question, how would I go about embedding my gmail inbox into the page? I would love to put m.gmail.com into an iframe restricted to a certain portion of the screen, but I know that won't likely be happening. Any ideas on how to embed an email summary or the calendar? (both served by Google) I've got the weather part working via AccuWeather's embed-able widget. I was inspired by this: http://lifehacker.com/5943867/hack-a-kindle-into-a-weather-display

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• Branching strategy for parallel development that won't be in the same release?

  - by Telastyn

  My team is working on a product, which for business reasons needs to be released on a regular schedule. An issue has arisen where we want to do development in parallel for the upcoming release, as well as the 'next' release. This is to become standard practice, so it's not as straightforward as cutting a feature branch for the new work. We'll continually have 2+ teams working on different releases of the same product. Is there an SCM best practice for this sort of arrangement?

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• Is it really free to deploy SharpDevelop apps?

  - by Gabriel

  I'm trying SharpDevelop to develop c# applications. Regardless of the language and the IDE, is it free to deploy applications that use WinForms? I've been developing with MonoDevelop just because it has a designer for Gtk# (client doesn't want to pay more for licences as to use VS...), but it's too buggy and it's making us lose lots of time. SharpDevelop looks great at first sight, but I wouldn't like the user or us to have problems with legal software. Thank you for the data! Warm regards.

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• Misunderstanding Scope in JavaScript?

  - by Jeff

  I've seen a few other developers talk about binding scope in JavaScript but it has always seemed to me like this is an inaccurate phrase. The Function.prototype.call and Function.prototype.apply don't pass scope around between two methods; they change the caller of the function - two very different things. For example: function outer() { var item = { foo: 'foo' }; var bar = 'bar'; inner.apply(item, null); } function inner() { console.log(this.foo); //foo console.log(bar); //ReferenceError: bar is not defined } If the scope of outer was really passed into inner, I would expect that inner would be able to access bar, but it can't. bar was in scope in outer and it is out of scope in inner. Hence, the scope wasn't passed. Even the Mozilla docs don't mention anything about passing scope: Calls a function with a given this value and arguments provided as an array. Am I misunderstanding scope or specifically scope as it applies to JavaScript? Or is it these other developers that are misunderstanding it?

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• Banner Ad Development: What programming should be required?

  - by FXquincy

  Banner Ad Development Career questions are potentially off-topic, but I've come across job postings wanting Banner Ad Developers. I'm not sure if they're development, design, or a niche particular to actionscript designers. First, What programming knowledge is required for Banner Ads (IDE, languages, Frameworks etc)? Second, is this a niche for designers or developers? How differently do designers and developers see their skills in JavaScript?

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• How to decide how backward-compatible my new Mac OS X application should be?

  - by haimg

  I'm currently contemplating writing an OS X version of my Windows software. My Windows application still supports Windows XP, and I know that if I drop support for it now, our customers will cry bloody murder. I'm new to OS X development, and as I learn the technology, APIs, etc., I realized that if I'm going to provide comparable level of backward compatibility (e.g. down to OS X 10.5), I would not be able to use many things that look very useful and relevant in my case (ARC, XPC communications, many others). This is quite different from Windows, in my opinion, where there are very little changed between Windows XP and Windows 7 from desktop application developer's standpoint. So, on one hand, it seems like a complete waste to stick to 2007 or 2009-level API in 2012. On the other hand, according to NetMarketShare report and Stat Owl report Mac OS X 10.5 and 10.6 market share is still 11% and 35%-40% respectively. However, I'm not sure if these older OS users are my target audience (buyers of software utilities) if they didn't bother to upgrade their OS... My question: Are there any other reasons I should take into account when deciding if I target 10.5 or 10.6 or 10.7 for a new application?

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• Separating a "wad of stuff" utility project into individual components with "optional" dependencies

  - by romkyns

  Over the years of using C#/.NET for a bunch of in-house projects, we've had one library grow organically into one huge wad of stuff. It's called "Util", and I'm sure many of you have seen one of these beasts in your careers. Many parts of this library are very much standalone, and could be split up into separate projects (which we'd like to open-source). But there is one major problem that needs to be solved before these can be released as separate libraries. Basically, there are lots and lots of cases of what I might call "optional dependencies" between these libraries. To explain this better, consider some of the modules that are good candidates to become stand-alone libraries. CommandLineParser is for parsing command lines. XmlClassify is for serializing classes to XML. PostBuildCheck performs checks on the compiled assembly and reports a compilation error if they fail. ConsoleColoredString is a library for colored string literals. Lingo is for translating user interfaces. Each of those libraries can be used completely stand-alone, but if they are used together then there are useful extra features to be had. For example, both CommandLineParser and XmlClassify expose post-build checking functionality, which requires PostBuildCheck. Similarly, the CommandLineParser allows option documentation to be provided using the colored string literals, requiring ConsoleColoredString, and it supports translatable documentation via Lingo. So the key distinction is that these are optional features. One can use a command line parser with plain, uncolored strings, without translating the documentation or performing any post-build checks. Or one could make the documentation translatable but still uncolored. Or both colored and translatable. Etc. Looking through this "Util" library, I see that almost all potentially separable libraries have such optional features that tie them to other libraries. If I were to actually require those libraries as dependencies then this wad of stuff isn't really untangled at all: you'd still basically require all the libraries if you want to use just one. Are there any established approaches to managing such optional dependencies in .NET?

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• Can't see YouTube videos in either Firefox or Chromium

  - by williepabon

  Dont' know why or if it is related, after upgrading Ubuntu 10.04 kernel ( I guess from 2.6.32-38 to -42) I can's see youtube videos. I checked the flash plug-ins installed and I have: (1) flashplugin-installer, (2) flashplugin-nonfree and (3) flashplugin-nonfree-extrasound. I haven't reinstalled the browsers yet. Here's the code of the plugins installed: williepabon@raquel-desktop:~$ sudo lsb_release -a; uname -a; dpkg -l | egrep 'flash|gnash|swf|spark' [sudo] password for williepabon: No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 10.04.4 LTS Release: 10.04 Codename: lucid Linux raquel-desktop 2.6.32-42-generic #95-Ubuntu SMP Wed Jul 25 15:57:54 UTC 2012 i686 GNU/Linux ii flashplugin-installer 11.2.202.238ubuntu0.10.04.1 Adobe Flash Player plugin installer ii flashplugin-nonfree 11.2.202.238ubuntu0.10.04.1 Adobe Flash Player plugin installer (transit ii flashplugin-nonfree-extrasound 0.0.svn2431-3 Adobe Flash Player platform support library Any ideas to solve this issue? Thanks.

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• Does upgrading a kernel automatically enable trim?

  - by Sheldon Ross

  Simple question, I have some servers that were running 10.04 that I upgraded to 12.04. So they were installed using 10.04 (kernel 2.6.32* I believe) and the version of ext4 that shipped then. By upgrading to 12.04 and the newer kernel, does that enable TRIM automatically? (Do I need to add 'discard' to the fstab?) Or do I need to do a clean install of 12.04 to get TRIM functionality on those drives.

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• Dell Inspiron7520 and ubntu 12.04 issues

  - by user91358

  I have a DELL Inspiron 7520 in the highest configuration: 3rd Generation Intel® Core™ i7-3612QM processor (6M Cache, up to 3.1 GHz) 15.6" Full High Definition (1080p) LED Display 8GB3 Dual Channel DDR3 SDRAM at 1600MHz 1TB 5400RPM SATA HDD + 32GB mSATA SSD w/Intel Smart Response Blu-ray Disc (BD) Combo (Reads BD and Writes to DVD/CD) AMD Radeon™ HD 7730M 2GB 6.09 lbs and I have installed Ubuntu 12.04 few days ago and I'm facing some issues: 1) sometimes the whole ntb freezes and I have to hold power button for 5 secs to shut it down. I think it is something with VGA and connected external monitor. I have read somewhere that it is already a reported bug, but what I am not sure about that it is doing sporadically. Sometimes it freezes right after I log in, sometime I ran few hours and then it freezes. I am using those proprietary drivers but I wasn't been able to install those with updates. 2) the next issue is the fan is quite noisy even when the ntb is almost Idle. (max 10% CPU usage). Can you recommend me some software which could do this power management to lower the noise? I have tried CPU frequency scaling indicator, but it seems that it has not any effects. 3) and issue no. 3: when I want to log out, restart or shutdown using the menu in upper right corner the upper and left trays disappear, but programs are still running and they won't close to complete log out or shutting down the OS. When I use the CLI command, it works fine. Thanks for any help you can provide.

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• How do I know if I am running Wubi or a proper dual-boot?

  - by Don

  I tried to setup a "proper" Windows/Ubuntu dual-boot system, by installing Ubuntu from a USB key. However, I simply could not get the laptop to boot off the USB despite the fact that I made the appropriate changes to the boot device order in the BIOS. So I then turned to Wubi, and (to cut a long story short) it seems I now have a proper dual-boot setup, because I don't need to launch Ubuntu from windows. When I start the laptop, I get that screen that asks me whether I want to run Windows or Ubuntu. However, I'm still not sure if this is a proper dual-boot setup, because when I run windows, it seems that my C: and D: drives are still the same size. If it was a proper dual boot I'd expect separate partitions to have been created for Ubuntu which would have removed some space from the C: and D: drive sizes displayed in Windows. Is there some way that I can confirm whether I'm running a proper dual-boot, and if not, is there some process for converting a Wubi installation to a proper dual-boot?

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• slow virtualbox guest

  - by ecoologic

  I run a guest ubuntu 12.04 on a host ubuntu 12.04, with virtual box, and the guest is much, much slower than the host (ALT+TAB costs 4-5secs). I had a look around and I found contradicting opinions on virtualbox vs vmware (free), so I taught to keep the former. Both systems are updated, I installed the additions on the guest and I evenly split memory and video memory (64mb) between guest and host. I am running a toshiba m200 laptop with 4GB ram and shared video memory. The host bios does not include a configuration option for machine virtualization. I have 2 cpus and I can't give them both to the vm. Is there anything I overlooked that could solve my problem? Feel free to ask for more info, and thank you for any help. EDIT Idling with the monitor open the (single) guest cpu never gets below 55% and could raise to 80 - 90% just moving the mouse around, opening ff will cause the monitor to run 100% in the guest, while the host shows that both cpus are evenly working around 60%. My cpu is Intel® Core™2 Duo CPU T5450 @ 1.66GHz × 2. If this is not a configuration problem, does it mean my machine is too weak for virtualization?

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• Problem installing from Ubuntu 12.04.1 LTS 32bit cd

  - by John Smith

  Older laptop currently running xp, only 128mb ram too. Is 128 just too small? But, 20+ gigs free hard drive and it's been defragmented. When I try to install Ubuntu from a CD I get the screen that says ubuntu and has the four red dots and then eventually goes blank and I just hear hard drive noises. Stays this way indefinitely (shut it off after half a day). Burned another cd, at slow writing speed too, and dl is from Ubuntu and get same result. Any help much appreciated!

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• What does the program cclive do?

  - by Pili Garcia

  I run: $ cclive "http://www.youtube.com/watch?v=NfLTl1yBzpg" and receive this error message: Checking ... ........ libquvi: error: /usr/share/quvi/lua/website/youtube.lua:117: no match: fmt_url_map I run: $ cclive "http://www.youtube.com/watch?v=0uuFeQXyODA" and receive this error message: Checking ... ....... libquvi: error: /usr/share/quvi/lua/website/youtube.lua:117: no match: fmt_url_map Etc., etc., etc.

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• sudo credential caching on by default

  - by Dan Dman

  Just installed a minimal ubuntu 12.04, then installed xfce4 and xinit from the command line after first boot. Totally vanilla installation afaik. I'm noticing that sudo caches the password until I issue sudo -k to clear it. This is unexpected behavior in my mind. I've run xfce4 before and don't recall credential caching being on, nor have I experienced it in the many previous ubuntu installs I've had over the years. Is this a new feature of Ubuntu? Is this something that's the result of the minimal install? Is this an xfce default that's been added recently?

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• Internet TV streaming applications

  - by mark kirby

  Are there any programs for Ubuntu that can pull TV streams from the Internet ? For example like on a blu-ray player you get BBC iplayer and hulu and youtube as apps, so is there an application that can do this ? I know XMBC can but its to fiddly and resource hungry, I just want the net TV apps and not the full media center. Boxee was great for this, it was a media center but had an interface for the apps not just sticking them in some strange menu like XBMC. Please let me know of anything you know of

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• ldap client cannot contact ldap server

  - by Van

  I have followed these instructions: https://help.ubuntu.com/12.04/serverguide/openldap-server.html#openldap-auth-config The ldap server works fine. I can log into it using an ldap account. However, I configured another Ubuntu 12.04 server as a ldap client for authentication but I cannot contact the server. Here is the error: On the client: # ldapsearch -Q -LLL -Y EXTERNAL -H ldapi://ldap01.domain.local -b cn=config dn ldap_sasl_interactive_bind_s: Can't contact LDAP server (-1) The server can receive requests: On the client: # telnet ldap01.domain.local 389 Trying 10.3.17.10... Connected to sisn01.domain.local. Escape character is '^]'. On the client: # ldapsearch -x -h ldap01.domain.local -b cn=config dn # extended LDIF # # LDAPv3 # base <cn=config> with scope subtree # filter: (objectclass=*) # requesting: dn # # search result search: 2 result: 32 No such object # numResponses: 1 On the server: # ps aux | grep slapd openldap 3759 0.0 0.2 564820 8228 ? Ssl 08:39 0:00 /usr/sbin/slapd -h ldap:/// ldapi:/// -g openldap -u openldap -F /etc/ldap/slapd.d I suspect I am missing a configuration parameter either on the server or on the client. I just cannot figure out what. Any help here would be appreciated.

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• Unattended grub configuration after kernel upgrade

  - by bouke

  Today I have been working on automatic deployment of an ubuntu server. I got stuck on automatic updating of the server using apt-get upgrade trying to upgrade to a new kernel. The log looks like this: Setting up linux-image-3.2.0-24-generic (3.2.0-24.39) ... Testing for an existing GRUB menu.lst file ... found: /boot/grub/menu.lst (...) Then a question is presented: Package configuration +---------------------------------¦ +---------------------------------+ ¦ A new version of /boot/grub/menu.lst is available, but the version ¦ ¦ installed currently has been locally modified. ¦ ¦ ¦ ¦ What would you like to do about menu.lst? ¦ ¦ ¦ ¦ install the package maintainer's version ¦ ¦ keep the local version currently installed ¦ ¦ show the differences between the versions ¦ ¦ show a side-by-side difference between the versions ¦ ¦ show a 3-way difference between available versions ¦ ¦ do a 3-way merge between available versions (experimental) ¦ ¦ start a new shell to examine the situation ¦ ¦ ¦ ¦ ¦ ¦ <Ok> ¦ ¦ ¦ +----------------------------------------------------------------------+ The desired outcome would be to select the first option and to continue: Replacing config file /run/grub/menu.lst with new version Updating /boot/grub/menu.lst ... done After running the upgrade by hand, I used debconf-get-selections to inspect the correct answer for the question (see other settings). It seems like update_grub_changeprompt_threeway is the question that should be answered. However, setting this using debconf-set-selections presented me with the same question: debconf-set-selections <<< "grub grub/update_grub_changeprompt_threeway select install_new" apt-get -y dist-upgrade How can this question be automated?

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• display port on x230 not working

  - by Aaron

  having problems with my new lenovo x230 - using dual montiors, only vga registers anything. This has the Intel graphics controller : 00:02.0 VGA compatible controller: Intel Corporation Ivy Bridge Graphics Controller (rev 09) TO get it to even boot, had to add the nomodeset parameter to the kernel. Otherwise will not even start up X Ive upgraded my kernel to the latest 3.6 with no difference. The display section reads the monitor as the only display and labels it as laptop. Cant seem to get it to work! Any help would be greatly appreciated.

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• NetworkManager doesn't detect my broadband device

  - by Joril

  I have a Huawei K3765 (USB ID 12D1:1520) and I'm trying to use it with Ubuntu 10.04 Lucid. I have usb-modeswitch installed, so when I plug the device I can see that it gets switched from storage-mode to modem-mode. My problem is that when I try to create a broadband mobile connection for it, NetworkManager doesn't detect the modem... I tried this on two different laptops. /var/log/daemon.log doesn't show anything of interest, AFAIKT... What could I try?

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• Why are my file selection dialogs so big? How do I make them smaller?

  - by Amanda

  When I use an external monitor, my file selection dialog boxes seem to be huge -- wider than my larger screen. I assume it is a nautilus issue since it happens whether I'm trying to open a file to upload (in firefox) or attach (in thunderbird) or just open it in LibreOffice. See screenshot: The browser window fills my left-hand monitor, the "open" dialog is wider than one screen, and wider than the window that spawned it. It's huge. It didn't used to be huge. Is there some way to force dialog windows to be smaller by default? Whenever I try to open/attach/upload a file I have to re-size the finder dialog before I can see what I'm looking at. I don't understand why it is defaulting to such a huge window.

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