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• Which web framework or technologies would suit me?

  - by Suraj Chandran

  Hi, I had been working on desktop apps and server side(non web) for some time and now I am diving in to web first time. I plan to write a scalable enterprise level app. I have worked with Java, Javascript, Jquery etc. but I absolutely hate jsp. So is there any framework that focuses on developing enterprise level web apps without jsp. I liked Wicket's approach, but I think there is a little lack of support of dynamic html in it and jquery(yes i looked at wiquery). Also I feel making wicket apps scalable would take some sweat. Can Spring MVC, Struts2 etc. help me make with this with just using say Java, JavaScript, and JQuery. Or are there any other options for me like Wicket. Please do forgive if anything above looks insane, I am still working on my understanding with enterprise web apps. NOTE: If you think that I should take a different direction or approach, please do suggest!

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• How to securely delete files stored on a SSD?

  - by Chris Neuroth

  From a (very long, but definitely worth to read) article on SSDs: When you delete a file in your OS, there is no reaction from either a hard drive or SSD. It isn’t until you overwrite the sector (on a hard drive) or page (on a SSD) that you actually lose the data. File recovery programs use this property to their advantage and that’s how they help you recover deleted files. The key distinction between HDDs and SSDs however is what happens when you overwrite a file. While a HDD can simply write the new data to the same sector, a SSD will allocate a new (or previously used) page for the overwritten data. The page that contains the now invalid data will simply be marked as invalid and at some point it’ll get erased. So, what would be the best way to securely erase files stored on a SSD? Overwriting with random data as we are used to from hard disks (e.g. using the "shred" utility) won't work unless you overwrite the WHOLE drive...

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• Precising definition of programming paradigm

  - by Kazark

  Wikipedia defines programming paradigm thus: a fundamental style of computer programming which is echoed in the descriptive text of the paradigms tag on this site. I find this a disappointing definition. Anyone who knows the words programming and paradigm could do about that well without knowing anything else about it. There are many styles of computer programming at many level of abstraction; within any given programming paradigm, multiple styles are possible. For example, Bob Martin says in Clean Code (13), Consider this book a description of the Object Mentor School of Clean Code. The techniques and teachings within are the way that we practice our art. We are willing to claim that if you follow these teachings, you will enjoy the benefits that we have enjoyed, and you will learn to write code that is clean and professional. But don't make the mistake of thinking that we are somehow "right" in any absolute sense. Thus Bob Martin is not claiming to have the correct style of Object-Oriented programming, even though he, if anyone, might have some claim to doing so. But even within his school of programming, we might have different styles of formatting the code (K&R, etc). There are many styles of programming at many levels. Sp how can we define programming paradigm rigorously, to distinguish it from other categories of programming styles? Fundamental is somewhat helpful, but not specific. How can we define the phrase in a way that will communicate more than the separate meanings of each of the two words—in other words, how can we define it in a way that will provide additional meaning for someone who speaks English but isn't familiar with a variety of paradigms?

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• Setting execute permission on a Fedora 11 (host and guest) shared folder file is not working for me.

  - by pmr

  I have set up a VirtualBox Fedora 11 (i386) guest on my Fedora 11 (x86_64) host system with shared folders enabled. I mount the shared folder successfully with the recommended "mount -t vboxsf share /shareddir -o rw,exec,uid=500,gid=100" command. I can successfully read and write files in the share from the guest but I cannot set the execute bit on any file in the share from the guest system. Nothing in GoogleSpace seems to address my issue let alone provide a solution. fwiw, selinux is disabled on both the guest and host and the shared folder is an ext4 file system.

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• Unity3D: How to make the camera focus a moving game object with ITween?

  - by nathan

  I'm trying to write a solar system with Unity3D. Planets are sphere game objects rotating around another sphere game object representing the star. What i want to achieve is let the user click on a planet and then zoom the camera on this planet and then make the camera follow and keep it centered on the screen while it keep moving around the star. I decided to use iTween library and so far i was able to create the zoom effect using iTween.MoveUpdate. My problem is that the focused planet does not say properly centered as it moves. Here is the relevant part of my script: void Update () { if (Input.GetButtonDown("Fire1")) { Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition); RaycastHit hit; if (Physics.Raycast(ray, out hit, Mathf.Infinity, concernedLayers)) { selectedPlanet = hit.collider.gameObject; } } } void LateUpdate() { if (selectedPlanet != null) { Vector3 pos = selectedPlanet.transform.position; pos.z = selectedPlanet.transform.position.z - selectedPlanet.transform.localScale.z; pos.y = selectedPlanet.transform.position.y; iTween.MoveUpdate(Camera.main.gameObject, pos, 2); } } What do i need to add to this script to make the selected planet stay centered on the screen? I hosted my current project as a webplayer application so you see what's going wrong. You can access it here.

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• Is 'Protection' an acceptable Java class name

  - by jonny

  This comes from a closed thread at stack overflow, where there are already some useful answers, though a commenter suggested I post here. I hope this is ok! I'm trying my best to write good readable, code, but often have doubts in my work! I'm creating some code to check the status of some protected software, and have created a class which has methods to check whether the software in use is licensed (there is a separate Licensing class). I've named the class 'Protection', which is currently accessed, via the creation of an appProtect object. The methods in the class allow to check a number of things about the application, in order to confirm that it is in fact licensed for use. Is 'Protection' an acceptable name for such a class? I read somewhere that if you have to think to long in names of methods, classes, objects etc, then perhaps you may not be coding in an Object Oriented way. I've spent a lot of time thinking about this before making this post, which has lead me to doubt the suitability of the name! In creating (and proof reading) this post, I'm starting to seriously doubt my work so far. I'm also thinking I should probably rename the object to applicationProtection rather than appProtect (though am open to any comments on this too?). I'm posting non the less, in the hope that I'll learn something from others views/opinions, even if they're simply confirming I've "done it wrong"!

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• What is wrong with my specular phong shading

  - by Thijser

  I'm sorry if this should be placed on stackoverflow instead however seeing as this is graphics related I was hoping you guys could help me: I'm attempting to write a phong shader and currently working on the specular. I came acros the following formula: base*pow(dot(V,R),shininess) and attempted to implement it (V is the posion of the viewer and R the reflective vector). This gave the following result and code: Vec3Df phongSpecular(const Vec3Df & vertexPos, Vec3Df & normal, const Vec3Df & lightPos, const Vec3Df & cameraPos, unsigned int index) { Vec3Df relativeLightPos=(lightPos-vertexPos); relativeLightPos.normalize(); Vec3Df relativeCameraPos= (cameraPos-vertexPos); relativeCameraPos.normalize(); int DotOfNormalAndLight = Vec3Df::dotProduct(normal,relativeLightPos); Vec3Df reflective =(relativeLightPos-(2*DotOfNormalAndLight*normal))*-1; reflective.normalize(); float phongyness= Vec3Df::dotProduct(reflective,relativeCameraPos); if (phongyness<0){ phongyness=0; } float shininess= Shininess[index]; float speculair = powf(phongyness,shininess); return Ks[index]*speculair; } I'm looking for something more like this:

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• Real world pitfalls of introducing F# into a large codebase and engineering team

  - by nganju

  I'm CTO of a software firm with a large existing codebase (all C#) and a sizable engineering team. I can see how certain parts of the code would be far easier to write in F#, resulting in faster development time, fewer bugs, easier parallel implementations, etc., basically overall productivity gains for my team. However, I can also see several productivity pitfalls of introducing F#, namely: 1) Everyone has to learn F#, and it's not as trivial as switching from, say, Java to C#. Team members that have not learned F# will be unable to work on F# parts of the codebase. 2) The pool of hireable F# programmers, as of now (Dec 2010) is non-existent. Search various software engineer resume databases for "F#", way less than 1% of resumes contain the keyword. 3) Community support as of now (Dec 2010) is less available. You can google almost any problem in C# and find someone that has already dealt with it, not so with F#. Third party tool support (NUnit, Resharper etc) is also sketchy. I realize that this is a bit Catch-22, i.e. if people like me don't use F# then the community and tools will never materialize, etc. But, I've got a company to run, and I can be cutting edge but not bleeding edge. Any other pitfalls I'm not considering? Or anyone care to rebut the pitfalls I've mentioned? I think this is an important discussion and would love to hear your counter-arguments in this public forum that may do a lot to increase F# adoption by industry. Thanks.

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• What's the best self-tracking software for Linux?

  - by trench

  I'm looking for a way to track myself and receive quality data upon which I can write future scripts/programs. For example, I use Google Reader a lot. I'd like to track the hrefs that garner my clicks. Further, I'd like to drop all of the words of each href into a database where they can be stacked in a hierarchical manner. At the end of the week I want to know that "Ubuntu" garnered 448 clicks and "Cheetos" garnered 2. :) That's just one example... I'd like this tracking and data-collecting to extend beyond my browser. I know writing something to do this myself wouldn't be too awfully difficult but if something already exists I'd happily use it. Thanks in advance. Primary OS: Ubuntu 10.04

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• Samba shares won't automount on boot from fstab

  - by kelvin

  This question seems to have been asked a few times, but doesn't seem anybody has really solved it yet, at least not for my specific circumstance. I have FSAT setup to mount a CIFs share, but on boot up the share never gets mounted. However, if i run mount -a after boot up, it mounts everything just fine. Here's what my fstab looks like. Ignore the commented ones... I just did a few for testing purposes right now. //192.168.1.97/media /mnt/samba cifs credentials=/home/xbmc/.smbcredentials,rw,file_mode=0777,dir_mode=0777,sec=ntlm,auto 0 0 #//192.168.1.97/media/TV\040Shows /home/xbmc/TV\040Shows cifs credentials=/home/xbmc/.smbcredentials,rw,file_mode=0777,dir_mode=0777,sec=ntlm,auto //192.168.1.97/media/Movies /home/xbmc/Movies cifs credentials=/home/xbmc/.smbcredentials,rw,file_mode=0777,dir_mode=0777,sec=ntlm,auto 0 0 //192.168.1.97/media/Music /home/xbmc/Music cifs credentials=/home/xbmc/.smbcredentials,rw,file_mode=0777,dir_mode=0777,sec=ntlm,auto 0 0 #//192.168.1.97/media/3\040-\040My\040Pictures /home/xbmc/Pictures cifs credentials=/home/xbmc/.smbcredentials,rw,file_mode=0777,dir_mode=0777,sec=ntlm,auto #//192.168.1.97/media/XBMC /home/xbmc/Admin cifs credentials=/home/xbmc/.smbcredentials,rw,file_mode=0777,dir_mode=0777,sec=ntlm,auto Have seen a few things on the internet where it was believed its because the share isn't available yet (i.e. wifi not connected yet, etc) when it's attempting to mount. 1) Is there anyway to confirm that's the problem, 2) IF so, is there a solution? Is there some way to put a delay in fstab? Or how might i write a script to run mount -a a certain amount of time after boot? Found the option _netdev from a little research, included that in fstab but still the same result. Thanks for your help.

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• distributed, fault-tolerant network block device

  - by gucki

  I'm looking for a distributed, fault-tolerant network storage system which exposes block devices (not filesystems) on the clients. A client's block device should write simultaneously to several storage nodes A client's block device should not fail as long as not all storage nodes backing it went down The master should automatically redistribute storages' data when a storage node fails or gets added/ removed A single master (which is for metadata only) is fine So ideally the architecture would be very similar to moosefs (http://www.moosefs.org/) but instead of exposing a real filesystem mounted using a fuse client it'd expose block devices on the clients. I know of iscsi and drbd but both don't seem to offer what I'm looking for. Or am I missing something?

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• Software for formatting / web-publishing tutorial-type, technical articles

  - by gojira

  I want to put some of my own technical writing on the web: tutorials, how-to's, conceptual articles about programming etc. I write mostly for myself yet, but think others can benefit from it so I want to put it online, and I also have plans of making everything more coherent and turning it into a book. My articles are not meant as a blog, they're just meant as a collection of tutorials and how-to's, but I think a blog-type software would probably be the most appropriate mode of formatting that kind of stuff. Right now I am using the blog feature of cite u like, which is very low tech and I really need something better. On my wish list is, among other things: code snippets in scrollable boxes syntax highlighting for source code snippets tagging articles with graphical icons according to topic, like in slashdot of course users (i.e. readers) should be able to comment on articles Also, just more options than a super-simple blog should look slick! should not look wikipedia-like Is there any software you can recommend for this purpose?

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• How to "translate" interdependent object states in code?

  - by Earl Grey

  I have the following problem. My UI interace contains several buttons, labels, and other visual information. I am able to describe every possible workflow scenario that should be be allowed on that UI. That means I can describe it like this - when button A is pressed, the following should follow - In the case of that A button, there are three independent factors that influence the possible result when pushing the A button. The state of the session (blank, single, multi, multi special), the actual work that is being done by the system at the moment of pressing the A button (nothing was happening, work was being done, work was paused) and a separate UI element that has two states (on , off)..This gives me a 3 dimensional cube with 24 possible outcomes. I could write code for this using if cycles, switch cycles etc....but the problem is, I have another 7 buttons on that ui, I can enter this UI from different states..some buttons change the state, some change parameters... To sum up, the combinations are mindbogling and I am not able come up with a methodology that scales and is systematically reliable. I am able to describe EVERY workflow with words, I am sure my description is complete and without logical errors. But I am not able to translate that into code. I was trying to draw flowcharts but it soon became visually too complicated due to too many if "emafors". Can you advice how to proceeed?

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• Installing packages in R path[1]="\file/users/bernard/R/win-library/2.15": Access is denied

  - by user1812210

  I recently attended an R training course and was happily working with a laptop in RStudio. On my return to the office I installed RStudio and I tried to run some scripts I had gathered from the course. However, these scripts required me to install packages and when I tried to install the packages the result was an error. Error in install.packages : path[1]="\file/users/bernard/R/win-library/2.15": Access is denied In my firm we write to a server drive refferred to as the U: drive rather than the hard disk on the desktop for security reasons. Any ideas what is going on? I have checked the properties of the folder in windows and it says I have permission but still it fails. I have tried creating a folder on the C drive and directing R_LIBS_USER to it but no luck.

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• Thanks All the readers and community and Happy new year to all of you.

  - by Jalpesh P. Vadgama

  This is my first blog post for new year 2011 and I would like to take this opportunity to thank all the readers for making my blog very successful and accepting me a community member. As year 2010 has lots of up down in IT filed it was recession period and now we almost recovered from it. Personally year 2010 has been very successful to me as I have been awarded as Microsoft Most Valuable Professional for visual C#. And It was one of the greatest achievement of my life. I would like to take this opportunity to thanks Microsoft for this and thanks all friends specially Jacob Sebastian who has given me guidance any time I required it. I have been also awarded dzone most valuable blogger this year and it was a nice surprise from dzone. I would like thanks dzone for this. Once again I am wishing you happy new year and may this year will bring success to all of you. One more thing I have found that I have met lots of people who is quite intelligent and exceptional developers and IT professionals but they are not blogging their stuff. I would say please my blog post a why a developer should write blog and Start blogging immediately because unless and until you don’t blog community will not know what you are doing.  Till then happy blogging and programming ... Stay tuned for more..

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• After logging out of SSH, screen sessions disappear on Arch Linux

  - by Ivan

  On Arch Linux (I'm on a single dedicated server, where my domain name points to only one IP), when I SSH into a user (say, for example, user mc), and then do screen -S test (or -dmS, the resulting issue is the same), run a command, and then detach from it, then exit out of my SSH session, and log back in, the screen session disappears. screen -ls returns No Sockets found in /run/screens/S-mc. The only way I can reattach to my sessions is if I never logged out of my SSH. How do I fix this? I do have read/write access in /run/screens/S-mc I detach from screen sessions with Ctrl-A,D disown -a && exit gives me the same problem shopt huponexit returns "huponexit off" There is no ~/.logout, and ~/.bash_logout is empty, with 3 lines of comments, telling me it's the ~/.bash_logout file ls -l /usr/bin | grep screen returns lrwxrwxrwx 1 root root 12 Oct 31 2012 screen -> screen-4.0.3 -rwsr-xr-x 1 root root 363672 Oct 31 2012 screen-4.0.3

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• Send less Server Data with "AFK"

  - by Oliver Schöning

  I am working on a 2D (Realtime) MultiPlayer Game. With Construct2 and a Socket.IO JavaScript Server. Right now the code does not include the Array for each Player. var io = require("socket.io").listen(80); var x = 10; io.sockets.on("connection", function (socket) { socket.on("message", function(data) { x = x+1; }); }); setInterval(function() { io.sockets.emit("message", 'Pos,' + x); },100); I noticed a very annoying problem with my server today. It sends my X Coordinates every 100 milliseconds. The Problem was, that when I went into another Browser Tab, the Browser stopped the Game from running. And when I went back, I think the Game had to run through all the packages. Because my Offline Debugging Button still worked immediately and the Online Button only responded after some seconds. So then I changed my Code so that it would only send out an update when it received a player Input: var io = require("socket.io").listen(80); var x = 10; io.sockets.on("connection", function (socket) { socket.on("message", function(data) { x = x+1; io.sockets.emit("message", 'Pos,' + x); }); }); And it Updated Immediately, even when I had been inactive on the Browser Tab for a long time. Confirming my suspicion that it had to get through all the data. Confirm Please! It would be insane to only send information on Client Input in a Real Time Game. But how would I write a AFK function? I would think it is easier to run a AFK Boolean Loop on the Server. Here is what I need help for: playerArray[Me] if ( "Not Given any Input for X amount of Seconds" ) { "Don't send Data" } else { "Send Data" }

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• Linux PCIE Physical Bus Address

  - by Without me Its just Aweso

  I am working on designing a custom PCIexpress card. I am trying to write a kernel module that will DMA my custom card. Right now when i plug the card into linux no valid PCI device shows up (meaning I probably have a error on my end, i know) however, If I halt the system at startup in the bootloader (uboot) I am able to directly access the card as I know in uboot the physical memory address that is mapped to my device. Is there a way I can access the card in a simliar fashion in linux? Thanks, Stephanie

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• Set up SSL/HTTPS in zend application via .htaccess

  - by davykiash

  I have been battling with .htaccess rules to get my SSL setup working right for the past few days.I get a requested URL not found error whenever I try access any requests that does not do through the index controller. For example this URL would work fine if I enter the it manually https://www.example.com/index.php/auth/register However my application has been built in such a way that the url should be this https://www.example.com/auth/register and that gives the requested URL not found error My other URLs such as https://www.example.com/index/faq https://www.example.com/index/blog https://www.example.com/index/terms work just fine. What rule do I need to write in my htaccess to get the URL https://www.example.com/auth/register working? My htaccess file looks like this RewriteEngine On RewriteCond %{HTTPS} off RewriteRule (.*) https://%{HTTP_HOST}%{REQUEST_URI} [L] RewriteCond %{REQUEST_FILENAME} -s [OR] RewriteCond %{REQUEST_FILENAME} -l [OR] RewriteCond %{REQUEST_FILENAME} -d RewriteRule ^.*$ - [NC,L] RewriteRule ^.*$ index.php [NC,L] I posted an almost similar question in stackoverflow

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• Assign PowerShell script to run at startup using PowerShell on Window Server 2012

  - by James Toyer

  I'm trying to write a PowerShell script that will run when a Windows 2012 instance is created on AWS using the configuration tools provided by AWS. My problem is that I want to change the name of the machine once it has started up, restart the machine and carry on set up process after. The main reason for this is that one of the applications, Boundary, installed in the set up process takes the name of the server when first installed. It is then doesn't seem possible to change it's name in their portal. Ideally I would have two PowerShell scripts, one to start the set up process, initialised through AWS and another that runs the first time the machine restarts. This second script would ideally be queued to run on the next start by the initial set up script. So I guess my question are: Is this possible? How would I go about doing this. My Google foo is letting me down here so any answers would be appreciated.

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• Should I have seperate business and personal websites?

  - by Thomas Clowes

  I have my business website - I am a web designer and developer, and also buy/sell websites/domain names. As such my website links to 'Our sites' = the websites which we design and run as well as a variety of tools such as a domain whois tool. These are obviously relevant to the business. As an individual, I like to travel and do white water kayaking as a hobby. I also have a degree in economics. I have thus created a blog on my business website where I write about domain names, web design, kayaking, travelling and economics. I've just begun researching SEO and am looking into optimizing my business website. I don't actually directly offer any services to clients at the moment, my main aim is to have a business website which supports my websites. If for example a potential advertise on one of my sites checks out the business website, I want them to think professional, down to earth, quirky. Given this is having my business/personal interests intertwined a problem? For SEO.. on my homepage for example when I'm writing a headline and a paragraph about what we do.. what do I put? and how do I optimize for SEO with keywords and the like? Further to the above, my company sponsors me and a group of accquantances as a kayaking team.. as such my personal interests do sort of overlap (just to add a complexity :))

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• Run Python Server at Startup

  - by DizzyDoo

  Hello, I've got a few Python based servers that I need to run, and would like them to start automatically when I start my Ubuntu Server box. What is the best way to execute them like this? I was hoping I could write a Bash script and use Screen to get them running in the background, where I can check on them every now and then, but where as echo screen -d -m python works just fine, echo screen -d -m `sudo python /home/matt/tornadoServer/tornadoDeploy.py` doesn't, with no error messages. Is that something to do with the spaces? Even though I did surround it with backquotes? I also tried: WEB="screen -d -m `sudo python /home/matt/tornadoServer/tornadoDeploy.py`" echo $WEB As a way of escaping the spaces, but no luck. What's Bash scripting way to do this? And, once the Bash script works, where can I put it to make it execute on startup?

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• Where are task scheduler event files stored on Windows Server 2008?

  - by MacGyver

  I tried setting up triggers in Task Scheduler Windows Server 2008, but Microsoft needs to fix a bug that I documented on Stack Overflow. So I can't use triggers until they fix this bug. Basically the Task Scheduler doesn't trigger an event that has a Result Code of 2147942402. http://stackoverflow.com/questions/10933033/windows-server-2008-task-scheduler-trigger-xml-syntax-for-email-notification-ta In the mean time, I'd like to write a task that runs .NET code that queries the log/event files programmatically every 15 minutes and sends success/failure emails based on the events that occured for the given tasks in task scheduler. Here's where the XPath is stored for the Task Trigger XML tab (that I can't rely on): C:\Windows\System32\Tasks\ I cannot find where the events (or log files containing the event ids) of each task are stored. Does anyone know where to find these log files? The log name is "Microsoft-Windows-TaskScheduler/Operational".

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• Send encrypted mail using GPG by command-line?

  - by Mohammad AL-Rawabdeh

  A few days ago I asked about how I can secure email and many people advised me to use PGP tool, and I read about it and I use it. Now I want to write a batch file to send encrypted email with attachments. I know how I can generate key, exchange key with other side and encrypt email with PGP mail but until now I don't know how I can integrate PGP tool with my mail and how I can send the encrypted email. In other words, how can I send encrypted email that encrypts with PGP tool to other side by command line (batch file)?

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• Problem in listening to multicast in multihomed Linux server

  - by Lior

  I am trying to write a multicast client on a machine with two NICs, and I can't make it work. I can see with a sniffer that once I start the program the NIC (eth4) start receiving the multicast datagrams: y.y.y.y. (some ip) - z.z.z.z (multicast ip, not my eth4 NIC IP) UDP Source port: kkk (some other port) Destination port: xxx (multicast port) However, I can't get those packets using my program (listening to port xxx on eth4). I also added: route add 224.0.0.0 netmask 240.0.0.0 dev eth4 Searched the web for some examples/explanations, but it seems like I do what everybody else does. Any help will be appreciated. is there anything else to do with route/iptables?

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