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Articles indexed Saturday March 31 2012

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• Subscribe/Publish Model in Web-based Application (c#) - Best Practices for Event Handlers

  - by KingOfHypocrites

  I was recently exposed to a desktop application that uses an publish/subscribe model to handle commands, events, etc. I can't seem to find any good examples of using this in a web application, so I wonder if I am off base in trying to use this for web based development (on the server side)? I'm using asp.net c#. My main question in regards to the design is: When using a publish/subscribe model, is it better to have generic commands/events that pass no parameters and then have the subscribers look at static context objects that contain the data relevant to the event? Or is it better to create custom arguments for every event that contain data related to the event? The whole concept of a global container seems so convenient but at the same time seems to break encapsulation. Any thoughts or best practices from anyone who has implemented this type of model in a web based application? Even suggestions on this model out of the scope of my question are appreciated.

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• How to structure an application which reads UPC barcodes

  - by tugberk

  I have no previous experience on creating a project for a seller which will use barcode reader. I am trying to put together a small project but I cannot figure out how the pieces should glue together. I will create a sample with Motorola Scanner SDK to read barcodes and from that point, I have couple of questions: How UPC barcodes work in general? AFAIK, a barcode stores the manufacturer and product info but no price data. Should I store price information inside a database which corresponds to barcode data? I would really appreciate if you can guide me here.

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• Strategy for building an application to replace a large spreadsheet

  - by Dan Walmsley

  I'm working on an application that is going to replace a rather large spreadsheet. The spreadsheet is used to budget purchases and things like that. It is the largest spreadsheet I have ever seen, and it required a lot of manual data entry, so this application is going to automate much of that. But as I'm working on this I've noticed its slow going. And I got to thinking this must be a common thing to do many companies will start with something like a spreadsheet, then when they get too big to maintain that, they will get a custom application built. So is there anything out there ( a framework or similar ) that does this sort of thing, migrating a spreadsheet to a custom application. I've had a quick Google but not really seen the kind of thing that I'm looking for. It's too late for this project, but I thought it would be worth having a look for next time. How do you guys tackle this problem?

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• Developing a Configurable Pricing Program

  - by Ben DeMott

  The organization I work at has some interesting requirements when it comes to pricing for online commerce. Currently the developers write different 'pricing rules' and those rules can be applied to our items based on attributes of the items. For Example: INPUTS: [cost, sug_retail, discontinued, warehouse_qty, orderable_qty, brand, type, days_available, shipping_rate, weight, map_protected, map_discount] MATCH: brand=x, warehouse_qty 1, discontinued=True, map_protected=False SET: retail_price = (sug_retail * 0.95), offer_price1 = (cost * 1.25 + shipping_rate) I am looking to allow the merchandising team to have more control over the pricing and formulas - they are afterall technical enough to write excel formulas. I've been looking at writing a desktop application that uses something like numexpr http://code.google.com/p/numexpr/ or http://sympy.org/en/index.html to allow non-programmers to integrate their own logic into our pricing backend. We have multiple price-tiers we have to set, for multiple markets, so an elegant solution is needed. It's getting frustrating for the dev team to continually tweak/manage all of the pricing rules (we sell over 200 brands in 3 markets). My question is; does this seem like a decent approach? Can you think of a better way to parse string-mathematical-grammer? Can you think of a different way for users to provide formula's to integrate into a automated pricing system? Does anyone know of any examples of existing applications that do this? Excel, and Access are out of the question - the volume of data we manipulate has already proven the need to automate it - now we just need some visibility into that automation.

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• What does it mean to be agile?

  - by JD01

  We have a project that everyone says we will be doing in a agile way but I doubt we have clearly understood what agile is. In previous projects we had planning meetings, then defined the product back log and allocated the work to developers in 2 to 3 week sprints. Every morning we had scrum meetings (which seemed to go on for 1/2 an hour each time) and each developer got on with it after that. Hardly anyone wrote any tests until at the end of sprint and work that was not completed was added on to the next sprint. Developers hardly spoke to each other and there was no TDD involved in development. In fact most developers had a spec at the start and just got on with it for the 2 or 3 weeks the sprint was arranged for. There was hardly any communication with the client/stake holder. QA got involved usually a few months later and by then we found missing requirements which further increased the amount of work we had to do. Clearly there was no feedback loop. So my question is, where did we go wrong and how can I prevent the team from making the same mistakes.

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• How to guide stakeholder(s) not to get far from the scrum vision?

  - by Saeed Neamati

  Consider this scenario: Stakeholder(s): Let's build a web application to manage user's financial data. Scrum team: Ok, let's do it. . . . After 3 sprints Stakeholder(s): Let's also implement a mailing system, so that when user's financial status is not good, (s)he would be warned. Scrum team: Ok, it's not that hard. We'll do it. . . . After 5 sprints Stakholder(s): Let's become a mailing provider. Here, how should scrum team guide stakeholder to stay inside the scope of scrum vision? Maybe a more fundamental question is, should the at all? Update: Of course there is a product owner. But by scrum team I meant PO, SM, and Team.

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• Software design methods for Java or any other programming language

  - by IkerB

  I'm junior programmer and I would like to know how professionals write their code or which steps they follow when they are creating new software. I mean, which steps they follow, which programming methodology, software architecture design application software, etc. I would like to find a tutorial where they explain from the beginning which steps I have to follow from The Idea I have in my mind to the final version of the application in any language. Or perhaps how is your programming steps or rules that you used to follow. Because everytime I want to create the an application I spend few time on the design and a lot of time coding (I know, that's not good).

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• career planning advice [closed]

  - by JDB

  Possible Duplicate: Are certifications worth it? I am at the point in my career where people start to veer off into either management-type roles or they focus on solidifying their technical skills to stay in the development game for the long-haul. Here's my story: I've got a degree in economics, an MA in Political Science and an MBA in Finance and Management. In addition, I've done coursework in advanced math and software development (although no degree in math or software). All-in-all, I've got 13 years of post-secondary education under my belt. I, however, currently work as a software developer using C# for desktop, Silverlight, Flex and javascript for web, and objective c for mobile. I've been in software development for the past 3.3 years, and it seems like it comes pretty easy to me. I work in a field called "geospatial information systems," which just involves customization and manipulation of geospatial data. Right now I am looking at one of several certifications. Given this background, which of these certifications has the highest ceiling? CFA PMP various development/technological certifications from Microsoft, etc. Other? My academic and work experience are all heavy on the analytical/development side, esp. so given the MBA and the B.S. in Econ. The political science degree was really a lot of stats. So it seems that I would be good pursuing more of the CFA/analytical role. This is a difficult path, however, because I have no work experience in the financial sector, and the developers in finance are all "quants," which again, I am OK with, but I haven't done much statistical modeling in the past 3.3 years. The PMP would require knowledge of best practices as it pertains explicitly to software development. I also don't enjoy a lot of business travel, a common theme for most PMP jobs I've seen. If certifications is the route, which would you recommend? Anything else? I've thought about going back to try to knock out a B.S. in C.S., but I wasn't sure how long that would take, or what would be involved. Thoughts or recommendations? Thanks in advance! I turn 32 this weekend, which is what has forced me to think about these issues.

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• What should I recommend a small company looking for C# developers

  - by Coder

  Here is the issue. I am a senior developer, and one of the start-ups I designed the system (management system/database/web) a long time ago, have grown and need software updates. I have left their system to another developer long time ago, but apparently he has left the job, and so they are asking me if I can suggest them where to find a new one. The problem is that the company has no clue that the IT is not cheap. They expect multiple features to be added for 40$, so that's an issue. Actually one of the reasons why I left the project when I did. Lots of expectations, little pay, also I know those people outside work, so I decided to avoided stressing the nonwork-relationships and left the project gracefully. Today they asked me for an advice, and I told them that the feature list they want is probably going to cost some if they'll get a senior developer for the job. So I guess their best bet is to find someone who loves coding and has just finished the school. Which would give someone a chance to code for money which is good for a student, and at the same time, allow the student to get some hands on experience. Then again, the system is not exactly 20 line console program, there is an MSSQL database, ASP.NET web page and content management system with all the AJAX stuff and some other things. So student straight out of school could have some problems with that. But, I thought about the issue some more, and I think that junior developer is a tricky deal, without mentoring, he can either screw up royally, or just do what's asked. Also, it seems no one is coming to interviews at all, which is weird, or maybe not. What should I suggest them?

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• Interview approaches and questions for a software developer intern

  - by maple_shaft

  What are some good ideas, common approaches and appropriate questions that you would bring when interviewing a software development intern to join your team? I really don't have expectations of any kind for this person, I understand that as an intern with no prior work experience that he won't have much to bring to the table. I am more or less looking for a good attitude and somebody willing to learn. What would be appropriate if you intend to put this intern 70/30 (QA Testing/Coding)? Would that be a good internship experience in your opinion?

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• Topics for development team cross training sessions

  - by BBlake

  Our team of developers are going to start holding monthly meetings for the purposes of cross training and knowledge improvement. We're looking for ideas for topics to discuss. We've already made a list of some obvious ones, such as discussions/training on specific applications, proper usage of TFS for source control, bug tracking and code reviews, coding standards, and corporate architecture. The problem we're having is that we are a cross-platform development team so we don't want to look at topics that only apply to certain members of the team (Sql, .NET, reporting, third party apps, etc). We'll use sub-team meetings for those. So what other topics that would apply across a broad development team would be good for these training sessions?

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• Why fork a library for your own application?

  - by Mr. Shickadance

  Why should a programmer ever fork a library for inclusion in a widely used application? I ask this question because I was reading an article about why Chromium isn't packaged for many Linux distros like Fedora. Apparently its largely due to the fact that Google has forked a number of libraries, modified them, and included them in Chromium. This has driven up the complexity of packaging releases. There are a number of reasons why this can be a bad thing, but how strong a case can you actually make for doing so in a large widely used application such as Chromium? The original article: http://ostatic.com/blog/making-projects-easier-to-package-why-chromium-isnt-in-fedora Isn't it usually worth the effort to make slight modifications to your own program in order to use a popular and well developed library?

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• Bazaar issues while installing Ubuntu TV

  - by Aleksi Kinnunen

  I tried to install Ubuntu TV in Ubuntu 12.04 with this guide: https://wiki.ubuntu.com/UbuntuTV/Contributing. Everything had been OK until I wrote to the terminal bzr branch lp:~s-team/ubuntutv/trunk ubuntu-tv. It says: Permission denied (publickey). ConnectionReset reading response for 'BzrDir.open_2.1', retrying Permission denied (publickey). bzr: ERROR: Connection closed: Unexpected end of message. Please check connectivity and permissions, and report a bug if problems persist.

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• Boot Ubuntu on smartphone SD card?

  - by berad

  Now here's what I want: Ubuntu on the SD card that lives in my phone. I like using Ubuntu portably and my phone as a flash drive, but I haven't been able to make these work together yet. I've tried booting off my Huawei U8800 (Android 2.2) and Nokia E66 with a micro-SD card (with 11.10, boots OK in a card-reader) on an eeepc 901 without luck. The Huawei doesn't show up in the BIOS boot menu. BIOS sees the Nokia but halts at "Boot error". I guess this is related to the phone's flash drive emulation and how it handles bootsectors, but I don't know enough about how that works to go any further. Has anyone succeeded in this?

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• Higher screen resolution in VirtualBox?

  - by pelms

  I've just installed Ubuntu 10.04 into VirtualBox on Windows 7. Unfortunately the only options showing for screen resolution are 640x480 and 800x600 and the monitor is showing as 'Unknown'. How would I go about upping the resolution to 1280x1024 (I'm on a 1600x1200 monitor)? Update I tried mounting the VirtualBox 'Guest Additions' ISO (from the VBox 'Devices' menu) and doing sudo sh ./VBoxLinuxAdditions-x86.run from the mounted drive, which gave 2 new listed resolutions after a reboot (1024x768 and the 16:9 version of that resolution). These worked when I selected them but disappeared when I switched back to another resolution. I tried rebooting and running VBoxLinuxAdditions-x86.run again but onlu the 2 low res options listed this time. I think I'm going to reinstall... Seems to be a VBox problem rather than an Ubuntu problem as after reinstalling 10.4 overwriting the original virtual partition, sudo sh ./VBoxLinuxAdditions-x86.run now has no affect at all.

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• Can T520+Bumblebee run an external monitor via DisplayPort?

  - by Fen

  Using 64-bit Ubuntu 11.10 and integrated (Intel) graphics, I can run the 1600x900 laptop display plus a 1600x1200 external monitor connected to the VGA adapter. But my external monitor is 1920x1200 so I have black stripes on each side. I believe the resolution is limited like this as the maximum resolution available from the Intel GPU is 2560x1600 = 4,096,000 pixels and I'm asking for a 3520x1200 = 4,224,000 display (with 1200x300 lost above the laptop screen). At 3200x1200 = 3,840,000 pixels, the Intel GPU seems happy. Under Windows, the same limit exists when using the VGA adapter, but if I turn Optimus on then I can connect the external monitor to the DisplayPort and get its full resolution and an extended desktop. I've seen that Bumblebee can run apps on the DisplayPort using the 'optirun' command. My question is: can Bumblebee run the DisplayPort in concert with the Intel card running the laptop screen creating a large virtual desktop (as on Windows)? If so, are there any pointers to how to do this? I tried once, failed, and dropped back to Integrated Graphics (and black stripes) as I could find no reports of this configuration working.

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• Sound works for only one user at a time

  - by Patrick

  I've noticed that sound becomes unavailable to me when someone else is logged into my machine and playing music (or has facebook open) in the other account. I've had to ask them to unlock their account and turn it off so I can get sound in my own stuff. Even in sound preferences, the hardware itself disappears and output is "dummy sound". Is there a way to prevent this from happening? What would be really good is if I could turn down the volume (or mute entirely) all the sounds on all other accounts on a per-user basis from my sound preferences without affecting whatever setting they have - essentially saying whenever user A is logged in, all sounds from user B's account are muted and anything from user C's account is at 50% while I can still have my own at full volume.

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• How do I fix “Ubuntu is running in low-graphics mode?” for NVIDIA GeForce GT555M

  - by David Chen

  As title, I'm using Ubuntu 10.04, and my ubuntu kept showing the sign “Ubuntu is running in low-graphics mode”. I've read another question with same topic (http://askubuntu.com/questions/10664/how-do-i-fix-ubuntu-is-running-in-low-graphics-mode ), but the other one is using ATI Radeon X1200. How can I fix the problem? I'm running Ubuntu on a 200GB partition, and the rest of my computer is Windows7. My graphic card is NVIDIA GeForce GT 555M, and my computer is ACER ASPIRE 5951G.

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• FTP over ssh hangs on "Connection established: Waiting for Welcome Message"

  - by Siriss

  I have looked far and wide and have not quite found the answer. I am running ubuntu 11.10, openssh, and vsftpd. I am trying to configure my FTP to tunnel over ssh. My ssh connection works just fine and I can create the tunnel to my FTP port. When I go to use Filezilla to connect, it hangs at "Waiting for Welcome Message". I think it is an iptables issue, but I can't seem to figure out what needs to be changed. When I take iptables down, it connects just fine. I don't want to open any more external ports, just my one SSH port, and I can't seem to get it right on the internal port forwarding rule. I always end up opening it to the outside. I would love some help if anyone has any ideas and I hope I have made it clear. Thank you in advance!!

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• How to prevent window list "confusion" when detaching eclipse views?

  - by amotzg

  I'm detaching eclipse views to float on my other screen in order to get more coding space on the first screen. When doing that, the detached windows appear in ubuntu's window list applet with the eclipse icon but with no title. Then, when pushing the main eclipse button on the window list, one of the detached views will get to front but not the main eclipse window. When using Alt+tab I can also see the extra eclipse icons but choosing the correct one for the main window works and make it the active window while also showing all detached childs. Other applications behave as expected, e.g. gimp floating panels don't show on the windows list and this is also the case with SlickEdit, Firefox child windows all show on window list but gets the focus correctly, etc. I can see the the workspace switcher show my two screens but in 'Monitor preferences' I see my two screens as one big screen. I'm working with ubuntu 10.04.4 under a VMware Workstation 7.1.3 build-324285. 'uname -a' output: Linux ubuntu 2.6.32-40-generic #87-Ubuntu SMP Tue Mar 6 00:56:56 UTC 2012 x86_64 GNU/Linux The desktop screen shot with the problem, ununtu's version, and Monitor preferences. How can I solve it and make only the main window show in window list or at least get activated when pushing it's button on the window list?

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• How do I turn off nVidia high performance mode?

  - by gpen06

  I am new to Ubuntu 11.10 and never touched linux until today. I installed Ubuntu alongside with Windows 7. I have an issue with my laptop overheating and freezing when it uses the high performance GPU graphics mode (hybrid card). It is an easy fix for Windows 7. I simply set the graphics mode manually to the low performance integrated graphics (save power) mode using advanced power settings. In Ubuntu, I'm stumped at how to do this. When using Ubuntu, my laptop is showing the same symptoms as it did without the fix for Windows. I have the nVidia graphics driver installed for Windows which allows me to see which mode I am in. I downloaded it off of my laptop's website (ASUS). They do not offer driver downloads for linux. Screenshot of power settings in Windows 7

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• What am I doing wrong in my config for MySql?

  - by Knight Hawk3

  When I load my my.conf with the config at the bottom Mysql fails to start and prints no errors. I am running Arch Linux (Updated) with the latest MySQL (5.5) and the latest nginx (Well latest in the repository, Not sure how to check. Only installed it today) I will give you any info you ask for. Thanks for helping! # The following options will be passed to all MySQL clients [client] #password = your_password port = 3306 socket = /var/run/mysqld/mysqld.sock # Here follows entries for some specific programs # The MySQL server [mysqld] port = 3306 socket = /var/run/mysqld/mysqld.sock skip-locking key_buffer = 16K max_allowed_packet = 1M table_cache = 4 sort_buffer_size = 64K read_buffer_size = 256K read_rnd_buffer_size = 256K net_buffer_length = 2K thread_stack = 64K # Don’t listen on a TCP/IP port at all. This can be a security enhancement, # if all processes that need to connect to mysqld run on the same host. # All interaction with mysqld must be made via Unix sockets or named pipes. # Note that using this option without enabling named pipes on Windows # (using the “enable-named-pipe” option) will render mysqld useless! # #skip-networking server-id = 1 # Uncomment the following if you want to log updates #log-bin=mysql-bin # Uncomment the following if you are NOT using BDB tables skip-bdb # Uncomment the following if you are using InnoDB tables #innodb_data_home_dir = /var/lib/mysql/ #innodb_data_file_path = ibdata1:10M:autoextend #innodb_log_group_home_dir = /var/lib/mysql/ #innodb_log_arch_dir = /var/lib/mysql/ # You can set .._buffer_pool_size up to 50 – 80 % # of RAM but beware of setting memory usage too high #innodb_buffer_pool_size = 16M #innodb_additional_mem_pool_size = 2M # Set .._log_file_size to 25 % of buffer pool size #innodb_log_file_size = 5M #innodb_log_buffer_size = 8M #innodb_flush_log_at_trx_commit = 1 #innodb_lock_wait_timeout = 50 skip-innodb [mysqldump] quick max_allowed_packet = 16M [mysql] no-auto-rehash # Remove the next comment character if you are not familiar with SQL #safe-updates [isamchk] key_buffer = 1M sort_buffer_size = 1M [myisamchk] key_buffer = 1M sort_buffer_size = 1M [mysqlhotcopy] interactive-timeout So what is my silly error?

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• Page Titles - Including gender of a fashion product in page titles?

  - by Cedric

  I need a bit of help to decide whether it is worth including gender in page titles. In the webmaster tools: I looked at our search queries that include "women", and they account for 9% of our total search queries for the site. I am wondering if it is the right way assess the benefit of including "woman" or "men" in page titles, looking at it with existing results pointing to us already? Is there another tool that I can check the actual queries that may not include us in search results? Like google insights maybe? http://www.google.com/insights/search/#q=shoes%2Cshoes%20for%20women&cmpt=q So it looks like 1.1% of searches for "shoes" are also "shoes for women" is that correct? As a direct comparison, doing the same analysis on our own search queries, I get 1.8% when comparing "shoes for women" to "shoes" Implementing this automation would probably affect 99% of our site if not more, splitting it in 2 segments (one portion of page titles including "women" and the other including "men") Will doing so create a massively repetitive keyword throughout the site, hurting SEO? http://support.google.com/webmasters/bin/answer.py?hl=en&answer=35624 (see "Avoid repeated or boilerplate titles.")

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• Any good web frameworks for asynchronous multiplayer games?

  - by Steven Stadnicki

  I'm trying to craft a site for web-based (original) board games, and my client (currently written in Actionscript, but that's highly fungible) works fine - I can play solitaire games in the client - but it has nothing to connect to. What I'm looking for is a server framework for handling accounts/authentication and game tracking: something that would let players log in, show them a list of their current games, let them invite friends to new games, let them make moves in the games they have open, etc. I'm flexible on language; obviously I'm going to have to write a lot of server code to handle the actual game logic, but that should be straightforward enough. I'm more concerned with how to handle the user (and game) DBs, though suggestions for a good server framework for communicating with the DBs (and serving up, most likely, JSON for client communications) are also welcome. Right now my leaning is towards Ruby (probably with Rails) but as far as I can determine it would be a pretty good chunk of effort to set up the necessary databases, so having something even higher-level would be really useful to me.

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• Level Editor + Game -> Duplicating rendering/game specific code?

  - by Utkarsh Sinha

  I've been reading about how to design code for a game. One thing I haven't been able to figure out is - how do you manage writing an outside-game level editor (not an 'in-game level editor') without 'copying' code from the game? For example, you might have to copy all code about the different types of entities you can have. You'll have to add the game rendering code. My guess is this can be done by making a DLL out of the 'engine' part of the game. Then, share it between the actual game and the level editor. Or is there a better/easier way to do this?

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