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• What to choose API based server or Socket based server for data driven application

  - by Imdad

  I am working on a project which has a Desktop Application for MAC/COCOA, a native application for iPhone another native application in iPad. All the application do almost same thing. The applications are data driven applications. Every communication to server is made via a restful API developed in PHP. When a user logs in a lot of data is fetched from server. And to remain in sync with server pooling is done. As there are lot of data to pool it makes application slower and un-reliable. A possible solution that comes into my mind is to use Socket based server. My question is that will it reasonably improve the performance? And which technology (of sockets) will be good as a server side solution for data driven application? I have heard a lot about Node.js. Please give your suggestions.

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• When is an object oriented program truly object oriented?

  - by Syed Aslam

  Let me try to explain what I mean: Say, I present a list of objects and I need to get back a selected object by a user. The following are the classes I can think of right now: ListViewer Item App [Calling class] In case of a GUI application, usually click on a particular item is selection of the item and in case of a command line, some input, say an integer representing that item. Let us go with command line application here. A function lists all the items and waits for the choice of object, an integer. So here, I get the choice, is choice going to conceived as an object? And based on the choice, return back the object in the list. Does writing this program like the way explained above make it truly object oriented? If yes, how? If not, why? Or is the question itself wrong and I shouldn't be thinking along those lines?

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• Best Practice - XML To Excel

  - by MemLeak

  I've to read a big XML file with a lot of information. Afterwards I extract the needed information (~20 Points(columns) / ~80 relevant Data (rows, some of them with subdatasets) and write them out in a Excel File. My Question is how to handle the extraction (of unused Data) part, should I copy the whole file and delete the unused parts, and then write it to excel or is it a good approach to create Objects for each column? should I write the whole xml to excel and start to delete rows in excel? What would be performant and a acceptable solution?

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• Robots.txt and "Bad" Robots

  - by Lynda

  I understand robots.txt and its purpose. I have read some people saying that using a Robots.txt gives "bad" robots or robots who do not obey a robots.txt a way to access pages on your site that you do not want accessed. While I am not looking to get into a debate about that I do have a question: If I have a structure like this: /Folder/ /Sub-Folder 1/ /Sub-Folder 2/ (Note: There are no pages within /Folder/ only other folders.) If I Disallow: /Folder/ it will prevent "good" robots from accessing the directory and any contents within the sub-folders. While we know that bad robots will see the /Folder/ will they be able to see and acess the sub-folders and the pages within the subfolders if they are not listed in the robots.txt? (Note: I do not fully understand how robots good or bad crawl a site beyond using a robots.txt and links within the site.)

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• which platform to choose for designing a game

  - by Pramod

  I am new to gaming platform and don't have any experience in gaming as well. I want to develop a small shooting game and don't have any idea from where to start and which platform to use like things. I have some experience in java and .net. Can anyone help me in giving me a start? I don't mind even if this question is voted down or closed. But please do help me. I've tried searching other similar questions but everyone is already into gaming and i can't get any of the words. Please refer me to some books or tutorials

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• Markdown, LaTeX combined in WYSIWYG editor. Is there any?

  - by om-nom-nom

  I really like the way markdown is implemented in SE bunch of sites, where I can easily write code blocks, performing formatting or even use latex on some of sites like writing $\pi$. I also like how this online editor looks and feels. But it's all online. Is there any offline WYSIWYG analogs of notepag or WMD in Ubuntu that optionally supports pdf as an output format? Both markdown and latex desired. I desire to simultaneously use Markdown and LaTeX. I'm planing to use an editor for writing some technical stuff with math, but it's annoying to be constantly in "LaTeX-mode". So it would be awesome to immerse in LaTeX when I need formulas and use markdown when I need to speak on natural language. UPD. Almost all answers was quite useful, but none of them answers directly on my question. I'll accept @N.N. answer as a most complete.

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• OpenGL-ES: clearing the alpha of the FrameBufferObject

  - by MrDatabase

  This question is a follow-up to Texture artifacts on iPad How does one "clear the alpha of the render texture frameBufferObject"? I've searched around here, StackOverflow and various search engines but no luck. I've tried a few things... for example calling GlClear(GL_COLOR_BUFFER_BIT) at the beginning of my render loop... but it doesn't seem to make a difference. Any help is appreciated since I'm still new to OpenGL. Cheers! p.s. I read on SO and in Apple's documentation that GlClear should always be called at the beginning of the renderLoop. Agree? Disagree? Here's where I read this: http://stackoverflow.com/questions/2538662/how-does-glclear-improve-performance

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• Is there a LibreOffice equivalent to microsofts office themes?

  - by Dr. Mike

  I've used MS office for many years now. Especially powerpoint. One of the strengths is that it defines and separates the concepts of template and theme. A theme can be saved and contains fonts, colours, and a set of images that can be reused every time you create a new presentation. This ensures that everyone in your organization uses exactly the same colours and fonts all the time. Now I know that you can download templates for LibreOffice, but I have not seen anything similar to the theme concept. The file extensions used in MS office are the following for the two concepts mentioned: Example Powerpoint template file name: mytemplate.potx Example Powerpoint theme file name: mytheme.thmx Now back to my question: Do these concepts and their separation exist in LibreOffice or OpenOffice? If so, how do I create them?

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• apt-get update bzip2 errors

  - by Tejas Kale

  I installed Ubuntu 11.10 today on my Lenovo w500. After that when i tried running sudo apt-get update This is the error i am getting. Get:117 http://ftp.jaist.ac.jp oneiric-security/universe TranslationIndex [73 B] 99% [48 Sources bzip2 0 B] [22 Sources bzip2 5,294 kB] 1,983 kB/s 0s bzip2: Compressed file ends unexpectedly; perhaps it is corrupted? *Possible* reason follows. bzip2: Inappropriate ioctl for device Input file = (stdin), output file = (stdout) It is possible that the compressed file(s) have become corrupted. You can use the -tvv option to test integrity of such files. You can use the `bzip2recover' program to attempt to recover data from undamaged sections of corrupted files. I found the following similar question : Errors while updating Ubuntu 11.10 , But the solutions mentioned ( changing the download server, running apt-get clean, apt-get autoclean) and have also tried removing the /var/cache/apt/archives/lists direcotry. As a result of this, I am unable to install any new packages.

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• How do you go about training a replacement?

  - by SnOrfus

  I recently asked about leaving a position and got a lot of great answers. One of the common threads was that being around to train the new person would be expected and could go a long way. Now considering that (I think) most people don't stay at a company for a long time after they've given notice, and it will take time for the company to interview/hire one - that leaves for a short amount of time to get someone up to speed. I've also never trained anyone before. I did a bunch of tutoring in University and College, but teaching a language/technology is far different from training someone to replace you on your job. So the question is: how do you go about training someone to replace you in a, potentially, short amount of time?

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• How do I ban a wifi network in Network Manager?

  - by Chris Conway

  My wifi connection drops sometimes and, for some reason, Network Manager attempts to connect to my neighbor's network, which requires a password that I don't know. The network in question is not listed in the "Edit Connections..." dialog and I can find no reference to it in any configuration file, but still the password dialog pops up every time my main connection drops. Is there a way to blacklist a wireless network so that the Network Manager will never attempt to connect to it? Or, equivalently, how can I remove the configuration data that causes the Network Manager to attempt to connect to this particular network?

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• Difference in fans on Windows 7 and Ubuntu 12.04

  - by Timo

  I have bought a Hp Pavilion DV7 with Core i7 CPU and installed Ubuntu 12.04 on dual boot with Windows 7 alongside. Apart from the difference in battery life (although that's fixed with Jupiter), I have another problem with the fans. On Windows my fans work perfectly and the laptop is cool, but it seems to overheat in Ubuntu. It becomes quite hot and it looks like my fans are not working under Ubuntu. I think I'm having the same problem as How can I keep the cpu temp low?, but since I cannot comment because of the lack of reputation (?), I post the question as a new thread. I think the result of the overheating is that my keyboard doesn't seem to follow when I start typing a long text. It just freezes and types the last letter multiple times. For example: when I type the word freezes, it shows freeeee so the zes changed into eee...

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• Easy user management on html site?

  - by James Buldon

  I hope I'm not asking a question for which the answer is obvious...If I am, apologies. Within my html site (i.e. not Wordpress, Joomla, etc.) I want to be able to have a level of user management. That means that some pages I want to be only accessible to certain people with the correct username and password. What's the best way to do this? Are there any available scripts out there? I guess I'm looking for a free/open source version of something like this: http://www.webassist.com/php-scripts-and-solutions/user-registration/

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• How to make pulseaudio work again?

  - by Pawel M.

  I was having problems with sound (mono only output), so following advice from another askubuntu question I made some edits in /etc/pulse/default.pa After rebooting I had no sound at all. So I deleted /etc/pulse/default.pa entirely and tried another reboot. I did not backup the file (stupid, I know). How to come back to working config? edit: I tried: sudo apt-get remove pulseaudio (reboot) sudo apt-get install pulseaudio (reboot) It's still not working. The file /etc/pulse/default.pa is missing. Here's what pulseaudio and pacmd commands show: $ pulseaudio E: [pulseaudio] main.c: Daemon startup without any loaded modules, refusing to work. $ pacmd No PulseAudio daemon running, or not running as session daemon.

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• Javascript slider Image and text from php, scrollable in groups by indexes

  - by Roberto de Nobrega

  I am looking for a javascript solution that slides images with text, pulled from php. This slider will slide in groups by indexes in points. I was googling, but nothing as I need. I am going to make an example. Imagine 10 products. I need to show the principal picture, and a text below the image. It is going to show 6 products, and with points (indexes), I click and the group slides to the next group. Do you know some script.?? I know the php code, but I am a newbie with javascript.! Thanks.!! PD. I am lost of where i have to put this question. So, If this was a wrong place, let me know, and accept my apologises.! ;)

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• Javascript slider Image and text from php, scrollable in groups by indexes

  - by Roberto de Nobrega

  I am looking for a javascript solution that slides images with text, pulled from php. This slider will slide in groups by indexes in points. I was googling, but nothing as I need. I am going to make an example. Imagine 10 products. I need to show the principal picture, and a text below the image. It is going to show 6 products, and with points (indexes), I click and the group slides to the next group. Do you know some script.?? I know the php code, but I am a newbie with javascript.! Thanks.!! PD. I am lost of where i have to put this question. So, If this was a wrong place, let me know, and accept my apologises.! ;)

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• Force gdm login screen to the primary monitor

  - by Kirill

  I have two monitors attached to my video card. Primary monitor has a resolution equal to 1280x1024 and the second has 1920x1200. My gdm login screen always appears on the second monitor even if it is switched off. My question is how to force gdm to show the login screen always on the primary monitor with resolution 1280x1024? I use Nvidia GT9500 videcard in Twinview mode. I can't use Xinerama because vpdau doesn't work correclty in this mode. What I have found is that mouse pointer always appears in the center of union of the screens and center is always on the monitor with higher resolution. Login screen always shows where mouse cursor is. Now my primary monitor has a resolution equal to 1920x1080. The problem still persists, mouse cursor always appears in the right-bottom corner of the second monitor.

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• Make my website dynamically loaded data available to Facebook Open Graph Object Scrapper

  - by fvaliquette

  Here is the design of my web site: The user enter myWebsite.com/a/1 .htaccess rules redirect to myWebsite.com/b Now the JavaScript ExtJS library is loading. Extracting the value from the URL (in this case it is “1”) Loading ./xml/1.xml From 1.xml setting the Open Graph data (Title, type, image, etc) Loading data that will be shown to the user from 1.xml into the website. My question is: How can I make the Open Graph data available to Facebook? Facebook do not to load my ExtJS JavaScript Library before extracting the Open Graph Object values from the HTML. Is there an easy solution to this problem? The only solutions I found is to make statics web pages or dynamically pages rendered on the server side but I would like to avoid these since my web page implementation is already finished and I would like to avoid re working on it.

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• Immutable Method in Java

  - by Chris Okyen

  In Java, there is the final keyword in lieu of the const keyword in C and C++. In the latter languages there are mutable and immutable methods such as stated in the answer by Johannes Schaub - litb to the question How many and which are the uses of “const” in C++? Use const to tell others methods won't change the logical state of this object. struct SmartPtr { int getCopies() const { return mCopiesMade; } }ptr1; ... int var = ptr.getCopies(); // returns mCopiesMade and is specified that to not modify objects state. How is this performed in Java?

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• 12.04 boots into terminal after first install. How to boot into GUI permanently?

  - by Deniz

  As a person with a quite limited CLI experience I congratulate myself on installing Ubuntu on an ancient non-pae Fujitsu Amilo M1425 thru the network with mini.iso. However upon reboot I'm met w/ the following: Ubuntu 12.04.1 LTS ubuntu-fujitsu tty1 ubuntu-fujitsu login: for which my specified login during setup is not accepted. (I'm quite sure its correct) Let's assume this screen is passed, how to start the GUI and make it the permanent option during boot? This box will return to a mostly comp-illiterate person, for which the existence of ubuntu will be an enough shock already. Wouldn't wanna leave him w/o the GUI. Other posts here mention the command startx but I probably need a login in the first place.. So "why won't it accept my login & how can I make the GUI-boot permanent?" is my question. Thanks in advance.

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• Using a SMTP Service for email

  - by Josh S.

  This may be a horribly obvious question, but I'm learning and just need someone to confirm it for me. I putting together a private social network that needs to email their members (through the social network software, Elgg) regularly. I'm hosting it on a shared HostGator plan (because they won't receive much traffic) and they'll email 10-1000 emails a few times a week. HostGator restricts you to 500 per hour. I'm also worried about deliverability. I've been searching up and down about how to throttle the emails so it will all send reliably... but then I came across the idea of an outside SMTP relay service. Would using an SMTP service resolve this issue? If so, any opinions on quality SMTP services?

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• Will domain change affect my pagerank?

  - by Chankey Pathak

  I have two blogger's blog. (http://chankeypathak.blogspot.com and http://javaenthusiastic.blogspot.com) One blog has PR 3 and the other blog has PR 2. I want to buy the domain for both blogs so that they will become http://chankeypathak.com/ and http://javaenthusiastic.com/ I will follow all the procedures that Blogger suggests so that all the visitors to http://chankeypathak.blogspot.com will be redirected to http://chankeypathak.com/ and same for the java's blog. I just want to know that whether this will affect my pagerank or not? I want my PR to remain same and not to be change because of domain change. Let me know. Thank you. PS: I don't know whether one person is allowed to post his site's URL in questions or not. If it is not allowed then you may edit the question.

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• Techniques to read code written by others?

  - by Simon

  Are there any techniques that you find useful or follow when it comes to reading and understanding code written by others when Direct Knowledge Transfer/meeting the person who wrote the code is not an option. One of the techniques that I follow when dealing with legacy code is by adding additional debugging statements and based on the values I figure out the flow/logic. This can be tedious at times. Hence the reason behind this question, Are there any other techniques being widely practiced or that you personally follow when it comes to dealing with code written by other people/colleagues/open-source team?

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• How to fix the apt-get -f install error [duplicate]

  - by Satish Patel

  This question already has an answer here: How do I fix a “Could not get lock /var/lib/dpkg/lock” problem? 12 answers I am getting continuous error when I run the command sudo apt-get -f install The output of the command is as follows: Reading package lists... Done Building dependency tree Reading state information... Done Correcting dependencies... Done The following extra packages will be installed: default-jre-headless icedtea-7-jre-jamvm openjdk-7-jre openjdk-7-jre-headless openjdk-7-jre-lib Suggested packages: fonts-ipafont-gothic fonts-ipafont-mincho ttf-telugu-fonts ttf-oriya-fonts ttf-kannada-fonts ttf-bengali-fonts The following NEW packages will be installed: default-jre-headless icedtea-7-jre-jamvm openjdk-7-jre openjdk-7-jre-headless openjdk-7-jre-lib 0 upgraded, 5 newly installed, 0 to remove and 28 not upgraded. 2 not fully installed or removed E: Could not get lock /var/cache/apt/archives/lock - open (11: Resource temporarily unavailable) E: Unable to lock directory /var/cache/apt/archives/ satish@satish-Inspiron-N5010 ~ $ please guide ASAP

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• FISL 12, Sao Jose Do Rio Preto, Brasilia, DFJUG, Goiania, and The Developers Conference, Sao Paolo

  - by arungupta

  Java EE 6/7 and GlassFish are visiting multiple cities in Brazil: Jun 26 - Jul 2 FISL 12, Porto Alegre Jul 3 Sao Jose Do Rio Preto JUG Jul 4 - 5 DFJUG Taguatinga, Brasilia and other venues Jul 6 - 7 Goiania JUG and other venues Jul 8 - 9 The Developers Conference, Sao Paolo Even though my main focus will be Java EE 6/7 and GlassFish but feel free to ask any question. There are several speakers from Oracle at FISL so stop by at the booth and talk to us. @paulojeronimo, with the help of the local community, organized a 10k run on the morning of Jul 5th. So please feel free to run along, should be fun. @raphaeladrien mentioned about some nice parks near my hotel in Goiania so you'll find me running there as well. There will be interesting discussions around different Web frameworks in Goiania. And then there are always 4 things to not miss in Brazil - Churrascaria, Guarana, Coffee, Caipirinha. Where will I see you ?

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