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• When to Use workflow engines?

  - by A01_

  I'm totally new to this concept from design perspective. I've worked in past on some of the workflow engines as programmer but never had a clarity on why we chose the work-flow engines in first place. And as programmer I know that there are at least 100 ways to do anything when you are writing code but only few of the ways are the best! I still don't understand which use cases are best solved by workflow engines (or rather their concept) than designing a good DI enabled application. I'm looking for any general characteristics of domain-neutral use cases, where work-flow engines are one of the the best options. So my question is: What are general characteristics of a requirement which can be taken as a signal for opting for a good workflow engine and coding around it? Cheers!

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• Does facebook store multiple password hashes for each user?

  - by loxxy

  I noticed that Facebook allows multiple variants of my own password : My password as it is. My password with first letter capitalized. My password with all letters capitalized. It is commonly known that passwords are stored as hashes. So my question is, does facebook store multiple hashes for each user? Since the hash of each variant should be completely different... Or am I missing something, here? And there may be more combinations, besides the one I observed as well. This is obviously done to provide a better user experience & they probably have a statistical explanation of people repeating these mistakes. But I could not help but wonder, is it worth to increase so many lookups (in their database) just to help the user type a wrong password? On top of this, they warn about the caps lock (even though they don't seem to care) :

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• Black screen on Ubuntu 12.04

  - by user1648371

  I've just upgraded to Ubuntu 12.04 and I'm experiencing some problems. The first thing I noticed is that when I click the Workspace switcher all I get is a black screen (I can guess where the different workspaces are located and clicked on them, not a practical solution though). In addition when I lock the screen or suspend the laptop (a Vaio VPCEB4M1E) I get a shifted screen (I see the right most vertical stripe on the left size of the monitor and nothing about all the rest, to put it clearly I can see the gear that allows me to turn the pc off, etc, but not much more..) when I go to the additional driver menu I see the "ATI/AMD proprietary FGLRX graphics driver" are installed and the post-release update version is available. I don't know if the problem is driver related, so before doing anything I'd like to get some suggestions from you guys. Thanks you!

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• Android Java: Way to effectively pause system time while debugging?

  - by TheMaster42

  In my project, I call nanoTime and use that to get a deltaTime which I pass to my entities and animations. However, while debugging (for example, stepping through my code), the system time on my phone is happily chugging along, so it's impossible to look at, say, two sequential frames of data in the debugger (since by the time I'm done looking at the first frame, the system time has continued to move ahead by seconds or even minutes). Is there a programming practice or method to pause the system clock (or a way for my code to intercept and fake my deltaTime) whenever I pause execution from the debugger? Additional Information: I'm using Eclipse Classic with the ADT plugin and a Samsung SII, coding in Java. My code invoking nanoTime: http://pastebin.com/0ZciyBtN I do all display via a Canvas object (2D sprites and animations).

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• Ways to give feedback on Silverlight

  There are a few ways to give feedback on Silverlight. I wanted to share my thoughts on them as some are obvious and some arent. First and foremost, the team is currently (Apr-May 2010) conducting a public survey on the next version planning. Weve put up a survey (yes its legit from Microsoft) for you to help provide some direction and help us further understand use-cases of Silverlight. Please take a few moments and complete the survey for meId appreciate it: Survey: Feedback on future versions...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 productive do you think/know you are?

  - by leinad

  I'm a good programmer, and I know it. Yet, I often find myself thinking that I actually work very slowly. I worked on a feature from Monday to Wednesday this week. On the way home on Wednesday I was wondering what had taken so long. It seemed like I should have been done in a single day but I wasted three to finish it up. This is not the first time I had this feeling. Do you ever feel this or the opposite?

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• And again... VMware Player 4.0.4 on Ubuntu 12.04 (Precise Pangolin)

  Even with the new version of VMware Player 4.0.4 you are still required to patch their sources. So, same game as last month. Just changing the value of the required version in the kernel patch script of Stefano Angeleri (weltall) and you are done: nano patch-modules_3.2.0.sh Please change line 8 at the top of the script like so: plreqver=4.0.4 Save your modification and then run the following commands: sudo rm /usr/lib/vmware/modules/source/.patchedsudo ./patch-modules_3.2.0.shsudo service vmware restart And again, on first start VMware will present you their EULA which you have to accept, and everything gets back to normal operation mode. Interestingly, one day ago the Ubuntu repositories provided a newer kernel version 3.2.0-25, so everything is running fine for now.

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• How does one manage perfectionism in programming? [closed]

  - by Craige

  Possible Duplicate: Where do you draw the line for your perfectionism? First of - I'm a perfectionist; I know and accept this. Problem is, this really is a counter-productive programming trait. It's a never-ending endeavor that hinders productivity as you find a new and "better" way you should be doing something. To me, if you're not doing it right, then don't do it at all. How does one manage such a characteristic in programming?

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• Initiating processing in a RESTful manner

  - by tom

  Let's say you have a resource that you can do normal PUT/POST/GET operations on. It represents a BLOB of data and the methods retrieve representations of the data, be they metadata about the BLOB or the BLOB itself. The resource is something that can be processed by the server on request. In this instance a file that can be parsed multiple times. How do I initiate that processing? It's a bit RPC like. Is there best practice around this? (First time on programmers. This is the right place for this sort of question, right?)

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• Halloween: Season for Java Embedded Internet of Spooky Things (IoST) (Part 2)

  - by hinkmond

  To start out our ghost hunting here at the Oracle Santa Clara campus office, we first need a ghost sensor. It's pretty easy to build one, since all we need to do is to create a circuit that can detect small fluctuations in the electromagnetic field, just like the fluctuations that ghosts cause when they pass by... Naturally, right? So, we build a static charge sensor and will use a Java Embedded app to monitor for changes in the sensor value, running analytics using Java technology on a Raspberry Pi. Bob's your uncle, and there you have it: a ghost sensor. See: Ghost Detector So, go out to Radio Shack and buy up these items: shopping list: 1 - NTE312 JFET N-channel transistor (this is in place of the MPF-102) 1 - Set of Jumper Wires 1 - LED 1 - 300 ohm resistor 1 - set of header pins Then, grab a flashlight, your Raspberry Pi, and come back here for more instructions... Don't be afraid... Yet. Hinkmond

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• How to make Ubuntu 14.04 run with less lag?

  - by King Shimkus

  I recently updated from Ubuntu 12.04 LTS to 14.04 LTS and for the first time it worked! However, whenever I move my mouse over an application icon on the unity shell, the animation takes forever to show me what the name of the application is ( A.k.a the tooltip ). The same happens with menus and sub-menus. Other than that, it is overall in general, slow. I just want to know if there are any tips to fix this or make my system faster. This is what it says when I type in glxinfo | grep renderer: GLX_MESA_multithread_makecurrent, GLX_MESA_query_renderer, OpenGL renderer string: Gallium 0.4 on llvmpipe (LLVM 3.4, 128 bits) Output of lspci | grep VGA: 00:02.0 VGA compatible controller: Intel Corporation 82865G Integrated Graphics Controller (rev 02)

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• Facing unity problems after upgrading to Ubuntu 12.04

  - by sh2515

  I upgraded to 12.04 and had problems with unity. So this is what I did 1) Ctrl + Alt + F1 sudo apt-get install compizconfig-settings-manager Export DISPLAY=:0 ccsm 2) Ctrl + Alt + F7 3) Enabled unityplugin 4) Ctrl + Alt + F1 unity --replace it worked with a couple of error messages now I have to put in start up application export DISPLAY=:0 unity --replace NVIDIA software recognises my monitor but ubuntu sees it as laptop. something isn't right can someone point out what info I need to put here for people to help. I have been upgrading this from 8 ish so have altered lots especially when compiz fusion first came out. Also if I run recovery session and type 'unity --replace' it starts and runs fine.

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• Designing a single look up entity

  - by altsyset

  In almost every application you have this look up entity that provides a dynamic references. This are things like type, category, etc. These entities will always have id, name, desc So at first I designed different entities for each look up. Like education_type, education_level, degree_type.... But on a second thought I decided to have on entity for each of these kinds of entities. But when I am done with the design and check the relation this entity will be referenced by almost all entities in the system and I don't believe that is appropriate. So What is your take on this? Can you give me some clear pros and cons?

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• Good places for starting to learn Lua scripting [closed]

  - by Cascalho

  I want to start learning to script in lua for game development. I could start with the official Lua tutorials, but I would rather study scripts that were written specifically for games and learn the syntax from there as I believe this is faster and more related to what I want. Can you recommend tutorials in video or text that are very detailed in explaining the code? Or some open source game with heavily commented code? What I want is something detailed that walks me through it, so I start understanding both the syntax and how each piece relate to each other, like "First of all, install this, this and that." "So, here we are defining a new function that will make the player jump." "This is the main script that calls the other ones. It defines these variables." "This function tests if the player is alive."

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• A relatively new blog seems to be getting very poor Google indexing

  - by Genadinik

  I have a new blog that is 2 months old. In the first few weeks, it was getting indexed nicely and my GoogleWebmaster reports were showing that it was getting crawled and began ranking for some terms. Then as I kept writing, the GoogleWebmaster report thinned out and showed less and less terms that this blog ranks for. Now there are only 4 terms with one of them being my name. Is there something I need to do to keep the old posts to remain indexed and crawled? Thanks, Alex

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• What to bring to a programming interview? [closed]

  - by ddrum

  I have just completed my Master's degree in Computer Science and have gotten my first job interview as a developer. I do not have much experience in large scale development projects, but I am hoping my university education counts for something. I am wondering, what materials should I bring that would impress my interviewers? What do most interviewers expect, especially from a new graduate? **Edit: The job interview went OK, except I forgot my pants. Thanks for all the great advice!

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• Issues with upgrade to ubuntu 14.04

  - by SUBPUR

  First, I should say that I am a total beginner. When answering, please do not take for granted that I understand even the most basic step. Now for my question: Yesterday, I was given the option to update to ubuntu 14.04. I clicked yes, and the system took about 2.5 hours to accomplish this task. Now, whenever I log into my user account, I get an error message and then I am asked to authenticate my user account. When I try to enter the password, my computer freezes. Please help, what can I do to fix this?

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• Empathy Video chat symbol (Indicator Icon)

  - by Anandababu153

  I'm using empathy for the first few weeks now on Ubuntu 12.10. I can't find any symbols indicating a contact has the ability to do a video chat or voice chat... Though I can see a "Mobile" symbol which say "Online from a mobile or Phone device". PS: I can see a video call, Audio call option enables when I right click on a particular contact. I don't see any option to configure anything like that. OS : Ubuntu 12.10 Gnome 3.6.1 (PPA) Empathy : 3.6.0.3

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• Resolution problems

  - by tampe125

  i'm having some troubles with screen resolution. First of all, i'm using a Lenovo Thinkpad E520, with BackTrack 5 R2 installed. As far as I know, BT is based on Ubuntu 3.2, so I hope this is the right place to ask for help. My natural resolution is 1366x768, but I'm stuck with 1024x768. This is my hardware: lspci | grep VGA 00:02.0 VGA compatible controller: Interl Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09) How can I fix that? Is there a ready-to-use driver or I have to compile that from source? At least, is there a solution, at all? :(

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• Google Scholar Realted Question

  - by Art

  I have just requested Google Scholar to use my web site for collecting papers from my personal web site: http://cs.uic.edu/~asmirnov/publications.html I was wondering if I did everything right: I submitted a request on the form provided on scholar web site I published the papers in PDF on my web site Is there anything else needed for Google to index my web site? Other questions are: 1. The first paper (link to it) is not to just paper, but to the whole issue. 2. Are there any tages to be added on my web site, if so, then which and how do I add them? 3. What are those exporting options available on google scholar web site and how do they work? Thank you very much for being patient with me and my questions as well.

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• A drop in SERP after following webmaster guidelines [on hold]

  - by digiwig

  So here's a puzzle for all you SEO gurus out there. I recently launched my own site. I had target keywords which were ranking very well for about 1 month, within the top five and even appearing in first place. In an attempt to maintain good positioning, I followed guidelines by adding robots.txt, an xml sitemap redirecting non-www to www redirecting index.php to root domain adding htaccess 301 redirect for old pages I added rich snippets created a google+ account, verified my picture to appear, I went through each of the webmaster issues with duplicate titles and meta descriptions and improved header tag document outlines i even created a few more blog posts to keep the content freshing and moving. So now my website appears on page 2 with my target keywords - and all because I followed the guidelines. What is happening? I see competitors with stagnant content superglued to position 1.

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• How to render a texture partly transparent?

  - by megamoustache

  Good Morning StackOverflow, I'm having a bit of a problem right now as I can't seem to find a way to render part of a texture transparently with openGL. Here is my setting : I have a quad, representing a wall, covered with this texture (converted to PNG for uploading purposes). Obviously, I want the wall to be opaque, except for the panes of glass. There is another plane behind the wall which is supposed to show a landscape. I want to see the landscape from behind the window. Each texture is a TGA with alpha channel. The "landscape" is rendered first, then the wall. I thought it would be sufficient to achieve this effect but apparently it's not the case. The part of the window supposed to be transparent is black and the landscape only appears when I move past the wall. I tried to fiddle with GLBlendFunc() after having enabled it but it doesn't seem to do the trick. Am i forgetting an important step ? Thank you :)

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• Print out the amount of times 2 words appear in the syslog. But also have it tell me how many times for each hour

  - by wolfspinone

  So I'm trying to create a bash script that looks for two words in my syslog file. Then I want the script to print out how many times those two words have appeared. Also I want it to print it out for every hour of the day. So like if the word dog appeared 4 times during the first hour of today, it says Hour one, dog 4. Finally at the end of the script I want it to print out how many times those words appeared all day. The sudo code I have thus far is if 2 > hour find permit find block print both finish if 1 < hour < 2 find permit find block print both finish if 2 < hour < 3 find permit find block print both finish command is grep -o "\WORD\" Syslog.txt * | sort | uniq -c

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• Books or resources about x86 64 assembly written in AT&T style?

  - by Gnijuohz

  I know what I'm asking for is quite specific and many would say if you know x86 assembly, this wouldn't be an issue. But now I'm taking a course that requires me to use x86 64 assembly in AT&T style and I'm not familiar with assembly in the first place. So I think if I can find some books or web resources about x86 64 assembly written in AT&T convention, it'll help me the most. But so far, I haven't found such books or detailed web resources yet. So can anyone point me to some good resouces? Advice on learning Assembly is also appreciated here!

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• Logic - Time measurement

  - by user73384

  To measure the following for tasks- Last execution time and maximum execution time for each task. CPU load/time consumed by each task over a defined period informed by application at run time. Maximum CPU load consumed by each task. Tasks have following characteristics- First task runs as background – Event information for entering only Second task - periodic – Event information for entering and exiting from task Third task is interrupt , can start any time – no information available from this task Forth task highest priority interrupt , can start any time – Event information for entering and exiting from task Should use least possible execution time and memory. 32bit increment timer available for time counting. Lets prepare and discuss the logic, It’s OK to have limitations …! Questions on understanding problem statement are welcome

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