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  • Where does this concept of "favor composition over inheritance" come from?

    - by Mason Wheeler
    In the last few months, the mantra "favor composition over inheritance" seems to have sprung up out of nowhere and become almost some sort of meme within the programming community. And every time I see it, I'm a little bit mystified. It's like someone said "favor drills over hammers." In my experience, composition and inheritance are two different tools with different use cases, and treating them as if they were interchangeable and one was inherently superior to the other makes no sense. Also, I never see a real explanation for why inheritance is bad and composition is good, which just makes me more suspicious. Is it supposed to just be accepted on faith? Liskov substitution and polymorphism have well-known, clear-cut benefits, and IMO comprise the entire point of using object-oriented programming, and no one ever explains why they should be discarded in favor of composition. Does anyone know where this concept comes from, and what the rationale behind it is?

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  • What is the best way to learn how to develop secure applications

    - by Kenneth
    I would like to get into computer security in my career. What are the best ways to learn how to program securely? It seems to me that besides textbooks and taking classes in the subject that perhaps learning how to "hack" would be one of the best ways to learn. My reason for thinking this is the thought that the best way to learn how to prevent someone from doing what you don't want them to is to learn what they're capable of doing. If this is the case, then this poses another question: How would you go about learning to hack in an ethical manner? I definitely don't want to break laws or cause harm in my quest. Thanks for the input!

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  • How to efficiently preserve a really big navigation history in Firefox?

    - by brandizzi
    When I was using Mac, my Firefox stored items in its history for really long times. Sometimes I needed to find a link to a site I have seen two years ago and it found it! Also, the autocomplete in the Firefox bar is really great, so a long history and the autocompleting yield a wonderful feature to me. Unfortunately, it seems this does not happen in Ubuntu's Firefox. I looked for solutions but I just got some Firefox developers saying the option of expanding history is out for performance issues and one is well advised to not try to change it (which read to me as saying "we cannot make it work well so we limit the scope"). Anyway, my question is: is there a way of efficiently expand the size of Firefox history? Sorry for my bitterness, but a solution with strings attached (mostly say that I should not do it, like this addon) is not solution for me. Does someone have the same need of mine and found a solution?

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  • samsung netbook n102sp problems with ubuntu 12.04 does not recognize intel 3150 hd high resolution

    - by foxtier494
    hello friends I have a samsung netbook n102sp atom processor 1.6, 2GB ddr3 ram and a intel 3150hd chiset chart, well the problem is the following the regular work pc has audio, lan, wi-fi reconose the video but I only lansa the resolution of 800 x 600 and I can not upload that's in the details of the computer I get into graphics (VESA: Intel ® Graphics XX) and I can not see videos because they only hear the audio and I use the vlc player I investigate intel 3150hd drivers and try to install layered but I was not please someone help me because it's an ugly work 800 x 600 and I can not see videos please, if anyone knows how to install the driver from Intel that are on the web please guide me when applied dpkg-s xserver-xorg-video-intel tells me that this driver installed ( XvMC "XVideo Motion Compensation" drivers for i810/i815 and i9xx and newer chipsets.)

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  • How much PHP do I need to know to use AJAX?

    - by user1146440
    Hi I am interested in learning to create AJAX calls with Javascript.I already know Javascript and I would like to learn PHP at some point but at the moment I know nothing about it and I don't have the time to learn the full language. How much PHP do I need to know to be able to do AJAX calls? Can someone recommend me some good resources to get familiar with what I need to learn from PHP so I can learn AJAX.I am planing on starting to read AJAX and PHP: Building Modern Web Applications 2nd Edition but I think I need to know some basic PHP.

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  • Ubuntu 13.10 software raid

    - by Piotr Belniak
    I had already Ubuntu OS installed on my desktop PC, where the software RAID 5 is configured ( 3 partitions /, swap and home ). This system was upgraded from the 11.04 till 13.04, it was quite messy, so I decided to install fresh system on existing partitions. 1st of all i found that there is no alternate version of the installer ( which i used to create previous installation ), so i stared with the regular image. I installed mdadm tools, assemble the partitions - fdisk are showing them properly - so i'm starting the installation - and everything i going fine until the GRUB instalation - this part fails - regardless of which partition i use as a target. From the other hand, neither OpenSUse and Ubuntu 12.04 alternate does not have any problems with installing the GRUB - on this configuration, unfortunatelly Ubuntu 12.04 - 12.10 upgrade is failing bacause of some Xorg issues ;(. Maybe someone has an experience with installation of ubuntu 13.10 GRUB on the RAID 5 partitions - and could give me a hint, how to solve my problem. Thanks in advance, Piotr

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  • What's the most important trait of a programmer desired by peer programmers [closed]

    - by greengit
    Questions here talk about most important programming skills someone is supposed to possess, and, a lot of great answers spring up. The answers and the questioners seem mostly interested on qualities related to getting a better job, nailing some interview, things desired by boss or management, or improving your programming abilities. One thing that often gets blown over is the genuine consideration for what traits peers want. They don't much value things like you're one of those 'gets things done' people for the company, or you never miss a deadline, or your code is least painful to review and debug, or you're team player with fantastic leading abilities. They probably care more if you're helpful, are a refreshing person to talk to, you're fun to program in pair with, everybody wants you to review their code, or something of that nature. I, for one, would care that I come off to my peers as a pleasurable programmer to work with, as much as I care about my impression on my boss or management. Is this really significant, and if yes, what are the most desirable traits peers want from each other.

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  • How can i point wildcard domains to a folder in apache

    - by Abishek R Srikaanth
    I am developing an app using PHP and deploying it on Apache on the Amazon AWS environment. This app requires to be made available to customers from their own chosen domain name? How can i acheive this? For example www.customer1.com = /var/www/myapp.mydomain.com www.customer2.com = /var/www/myapp.mydomain.com I would like to do this similar to how bitly enables shortened url's for custom domains. www.myshrturl.com is dns configured to a CNAME - cname.bitly.com Appreciate if someone could help me acheive this functionality. If there are any other details required, please let me know, I shall update the same.

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  • Terminal error messages: bash: /dev/cgroup/cpu/user/2823/tasks: No such file or directory

    - by sasaenator
    This is what I get when I start up the terminal: bash: /dev/cgroup/cpu/user/2823/tasks: No such file or directory bash: /dev/cgroup/cpu/user/2823/notify_on_release: No such file or directory bash: /dev/cgroup/cpu/user/2823/tasks: No such file or directory bash: /dev/cgroup/cpu/user/2823/notify_on_release: No such file or directory sasa@sasa:~$*** I reinstalled 10.10 yesterday because of other problems, I didn't have this error message before. I have a separate /home partition, and new installation picked up almost all of the old settings, also those which I don't like, but it looks like that is not a problem or maybe I am wrong? Wouldn't ask if I knew! :) I'll be glad to post more info if someone needs it!

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  • Should companies require developers to credit code they didn't write?

    - by sunpech
    In academia, it's considered cheating if a student copies code/work from someone/somewhere else without giving credit, and tries to pass it off as his/her own. Should companies make it a requirement for developers to properly credit all non-trivial code and work that they did not produce themselves? Is it useful to do so, or is it simply overkill? I understand there are various free licenses out there, but if I find stuff I like and actually use, I really feel compelled to give credit via comment in code even if it's not required by the license (or lack thereof one).

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  • How do I get an Epson al-c 1700 printer working?

    - by Edmond Frants
    I have a brand new epson aculaser c1700 and i'd like to have it working fine on ubuntu 12.04. so i did my homework, kind of, no printer driver comes for this printer in cups ... so i asked epson support who drove me to avasys who no longer handle support since december 2011. This the question that is still in my mind : as this printer comes with an osx driver which uses cups as printer server, how come no driver can be found for cups? I tried to get ppd and filters from osx driver and use them to install the printer on ubuntu but no answer from printer and none printed sheet i have .... i'm so disappointed i could cry ... I'd like to work with someone to get this working fine, please help me!

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  • How Do I interpret HDD S.M.A.R.T Results?

    - by Marty
    My laptop has recently started to become a bit unreliable, and for some reason I started to suspect that my HDD was starting to fail. After a bit of hunting on the internet, I found Ubuntu's Disk Utility in the System menu and ran the long SMART diagnostics from this. However, since the documentation for Disk Utility is very poor (palimpsest?), I'm not sure how to interpret the results: For example, the Read Error Rate is over 50 million (!), yet the Assessment is rated "Good". So would someone mind explaining to me how to interpret the results of these tests (especially the Normalized, Worst, Threshold and Value numbers)? And maybe tell me what they think of the results I got for my HDD? (Thanks)

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  • Looking for an open source project in Python

    - by Roman Yankovsky
    I am looking for practical tasks to get experience with Python. Just reading the books and not doing any tasks in the language is not effective. I solved some problems on the Project Euler and TopCoder and it helped me to learn the syntax of the language better. But those tasks are hard algorithmically, but as a rule is quite simple from the point of view of programming. Now I'm looking for an interesting open source project in Python, participation in which will help me to better understand the OO-model of language. Although, this is my first step with Python, in general, I am an experienced programmer and I can be useful for a project. May be someone can suggest something?

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  • iPad Jailbreak &ndash; On The Lam In A Single Day

    - by David Totzke
    Exploits to jailbreak the iPhone are well known.  The iPad runs on the iPhone 3.2 firmware.  What this means is that the iPad was shipped with known security vulnerabilities that would allow someone to gain root access to the device. Nice. It’s not like these are security vulnerabilities that are known but have no exploits.  The exploits are numerous and freely available. Of course, if you fit the demographic, you probably have nothing to worry about. Magical and Revolutionary?  Hardly. Dave Just because I can…

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  • How to get Magento to update order status when PayPal returns IPN message?

    - by Nick
    When someone checks out in Magento with PayPal, and PayPal flags their payment for review, Magento correctly sets the order status to "Payment Review". However, if after a day or two PayPal decides the order is OK, it sends an IPN message to Magento with the proper payment status of "Pending" and pending reason of "authorization". I can see this IPN message in Magento's paypal logs (and can simulate it with the sandbox), however, when Magento receives this message it does not update its order status. Why not and how can this be fixed? I am using Magento 1.5.1.0.

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  • Bastion unexpectedly exits when I move my cursor

    - by user69358
    I downloaded the Humble Indie Bundle V, mostly because my friend told me about how great Bastion was. When I first installed it, I was getting the seemingly common "black screen" error that most people got (fixed that half with this http://ubuntuforums.org/showthread.php?p=11992661). But I also have an error where every time I move my cursor, in any direction, any amount, the game closes instantly. I can use the keyboard no problem, but without fail, every time I move my mouse, it crashes. Does anyone know what might be causing this? Has anyone encountered anything like this before? I am worried it may be a hardware issue, but hoping someone might be able to help me out. I'm running Ubuntu 12.04 on a Dell Studio 1558. Graphics card is the stock Intel graphics card, running on 4 GB of RAM.

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  • Oracle WebCenter at the Enterprise 2.0 Conference

    - by Brian Dirking
    We had a great week at the E20 Conference, presenting in four sessions – Andy MacMillan gave a session titled Today’s Successful Enterprises are Social Enterprises and was on a panel that Tony Byrne moderated; Christian Finn spoke on a panel on Unified Communications Unified Communications + Social Computing = Best of Both Worlds?, Mark Bennett spoke on a panel on The Evolution of Talent Management. The key areas of focus this year were sentiment analysis, adoption and community building, the benefits of failure, and social’s role in process applications. Sentiment analysis. This was focused not on external audiences but more on employee sentiment. Tim Young showed his internal "NikoNiko" project, where employees use smilies to report their current mood. The result was a dashboard that showed the company mood by department. Since the goal is to improve productivity, people can see which departments are running into issues and try and address them. A company might otherwise wait until the end of the quarter financials to find out that there was a problem and product didn’t ship. This is a way to identify issues immediately. Tim is great – he had the crowd laughing as soon as he hit the stage, with his proposed hastag for his session: by making it 138 characters long, people couldn’t say much behind his back. And as I tweeted during his session, I loved his comment that complexity diffuses energy - it sounds like something Sun Tzu would say. Another example of employee sentiment analysis was CubeVibe. Founder and CEO Aaron Aycock, in his 3 minute pitch or die session talked about how engaged employees perform better. It was too bad he got gonged, he was just picking up speed, but CubeVibe did win the vote – congratulations to them. Internal adoption, community building, and involvement. On this topic I spoke to Terri Griffith, and she said there is some good work going on at University of Indiana regarding this, and hinted that she might be blogging about it in the near future. This area holds lots of interest for me. Amongst our customers, - CPAC stands out as an organization that has successfully built a community. So, I wonder - what are the building blocks? A strong leader? A common or unifying purpose? A certain level of engagement? I imagine someone has created an equation that says “for a community to grow at 30% per month, there must be an engagement level x to the square root of y, where x equals current community size, and y equals the expected growth rate, and the result is how many engagements the average user must contribute to maintain that growth.” Does anyone have a framework like that? The net result of everyone’s experience is that there is nothing to do but start early and fail often. Kevin Jones made this the focus of his keynote. He talked about the types of failure and what they mean. And he showed his famous kids at work video: Kevin’s blog also has this post: Social Business Failure #8: Workflow Integration. This is something that we’ve been working on at Oracle. Since so much of business is based in enterprise applications such as ERP and CRM (and since Oracle offers e-Business Suite, Siebel, PeopleSoft, and JD Edwards, as well as Fusion Applications), it makes sense that the social capabilities of Oracle WebCenter is built right into these applications. There are two types of social collaboration – ad-hoc, and exception handling. When you are in a business process and encounter an exception, you immediately look for 1) the document that tells you how to handle it, or 2) the person who can tell you how to handle it. With WebCenter built into these processes, people either search their content management system, or engage in expertise location and conversation. The great thing is, THEY DON’T HAVE TO LEAVE THE APPLICATION TO DO IT. Oracle has built the social capabilities right into the applications and business processes. I don’t think enough folks were able to see that at the event, but I expect that over the next six months folks will become very aware of it. WebCenter also provides the ability to have ad-hoc collaboration, search, and expertise location that folks need when they are innovating or collaborating. We demonstrated Oracle Social Network. It’s built on our Oracle WebCenter product to provide social collaboration inside and outside of your company. When we showed it to people, there were a number of areas that they commented on that were different from the other products being shown at the conference: Screenshots from within the product Many authors working on documents simultaneously Flagging people for follow up Direct ability to call out to people Ability to see presence not just if someone is online, but which conversation they are actively in Great stuff, the conference was full of smart people that that we enjoy spending time with. We’ll keep up in the meantime, but we look forward to seeing you in Boston.

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  • Resources for game networking in Java

    - by pudelhund
    I am currently working on a Java multiplayer game. The game itself (single player) already works perfectly fine and so does the chat. The only thing that is really missing is the multiplayer part. Sadly I am absolutely clueless on where to start with that. I roughly know that I will have to work with packages, and I also know many things about streaming etc (chat is already working). Oh and it should - according to this article - be a UDP server. My problem is that I can't find any resources on how to do this. A tutorial (book or website) would be perfect, alternatively a good example of an open source client/server (in Java of course) would be fine as well. If you feel like doing something helpful I'd also really appreciate someone "privately" teaching me via email or some chat program :) Thank you!

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  • IIM Calcutta &ndash; EPBM 14 &ndash; Campus Visit - Arrival

    - by Ram Shankar Yadav
    Here I’m in the Mecca of Management, India’s premier institute of management, to learn great things about management with the management Gurus!! As they say a picture is worth thousand words, so I’ll say it by thousand Pictures ;) EPBM, yep that’s an acronym for Executive Programme in Business Management. It’s a year long program having 14 different management subject, designed to suit working professionals. For more info on EPBM please visit : http://www.iimcal.ac.in/edp/ld.asp or http://www.hnge.in/retail/iimc/iimc_epbm_15.htm   I’m gonna post my experiences, and hope that it will be useful for someone, who is interested in doing this programme. The collage above depicts my full day i.e., 25th April 2010, which started by taking pictures of beautiful moon night @ 3 AM, followed by air travel from 11 AM - 5 PM , meeting with friends/batch mates at Kolkata airport, one and half hour ride to Joka Campus by Yellow Taxi, “New Building” hostel…etc. Things that I didn’t captured on camera : Sweat after reaching campus, IPL Final watching in Common Room, Lot of GAGS and things that you can only experience by being here ….!~ Stay tuned for more…. ram :)

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  • How to pass GET parameters to rewritten URL?

    - by Jakobud
    I have an .htaccess rewrite rule like this: RewriteCond %{SCRIPT_FILENME} !-d RewriteCond %{SCRIPT_FILENAME} !-f RewriteRule ^search/(.*)$ search.php?q=$1 What this does is, if someone visits http://www.mysite.com/search/test the URI that is really processed is http://www.mysite.com/search.php?q=test. Now, if I try to pass an extra random GET parameter to my rewritten URL, the parameter is ignored. So if I try to do visit here: http://www.mysite.com/search/whatever?extra=true The parameter extra is ignored. It doesn't seem to get passed at all. Can this problem be fixed? If so, how?

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  • SDL to SFML simple question

    - by ultifinitus
    Hey! I've been working on a game in c++ for about a week and a half, and I've been using SDL. However, my current engine only needs the following from whatever library I use: enable double buffering load an image from path into something that I can apply to the screen apply an image to the screen with a certain x,y enable transparency on an image (possibly) image clipping, for sprite sheets. I am fairly sure that SFML has all of this functionality, I'm just not positive. Will someone confirm my suspicions? Also I have one or two questions regarding SFML itself. Do I have to do anything to enable hardware accelerated rendering? How quick is SFML at blending alpha values? (sorry for the less than intelligent question!)

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  • When to roll your own game engine?

    - by Joey Green
    I've been a software developer for 5 years now and wanting to get into iOS game development. I've played around with the iOS SDK for about 2 years now, attending cocoaheads meetings and feel I have a good grasp on objective-c/cocoa and even c/c++. I have a game idea and know that I will use Box2D but I'm wondering if I should use cocos2D or not. The main reasons are: I may want to do things graphics wise that aren't available in cocos2d. If I roll my own game engine I'll have more control. Of course the main reason for using a already existing game engine is the time it saves and it makes the hard stuff easier, but for someone who has the technical chops to roll his own does it make sense?

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  • How to unhide an application?

    - by blacklaptop
    I hope you can help me. I have installed ubuntu 12.04 using wubi, my issue is i installed iptux using ubuntu software center, it worked fine, i decided that i wanted it to be hidden at start up, so i changed its setting in preferences. i assumed that if i needed to use it i could go to internet menu and select it. But after restarting i found that after i click on iptux under Internet nothing happens, but i click it after that then a small window shows Fatal Error!! Failed to bind the TCP/UDP port(2425)! Address already in use. I have tried uninstalling using ubuntu software center and reinstalling it but it still had the same problem. I thought it maybe because some files were not uninstalled by USC, so i installed synaptic and uninstalled iptux (complete uninstallation) and then reinstalled it and the same situation occurs. I was hoping someone could inform me how i could unhide iptux. Thank You

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  • SQL SERVER – Free Online Training on .net and SQL

    - by pinaldave
    I around 10 Free Online Training Codes available of .NET and SQL Training from Pluralsight. I am willing to give it to someone who wants learn technology this weekend. You just have to go to my Facebook page and leave a comment explaining in one line – what course will you learn during weekend. I will send all this codes to 10 winners whom I will randomly select using Facebook. Meanwhile do you know how can you generate Zero without using any numbers in T-SQL. My friend Madhivanan has done that and I find it very interesting.Run following T-SQL code – ‘SELECT $’. He has written many other tricks how to generate zero also on his blog. On another note – I have published my answer for question about SELECT * vs SELECT COUNT(*) here. Reference: Pinal Dave (http://blog.SQLAuthority.com) Filed under: About Me, Best Practices, Pinal Dave, PostADay, SQL, SQL Authority, SQL Query, SQL Server, SQL Tips and Tricks, T SQL, Technology

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  • Can't boot Ubuntu 12.04

    - by carlo
    I installed 12.04 on my windows vista laptop. I wanted to make run Ubuntu and ditch windows. I selected to delete disk and install 12.04. It won't let boot 12.04 with out the install disk. When I turn on my laptop now it goes to a black screen with a blinking cursor. I have to power off then insert Ubuntu 12.04 cd as if it wants me to reinstall. I checked the drive and Ubuntu is there with some of my other saves as well. Can someone help me please?

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