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• A talk about observer pattern

  - by Martin

  As part of a university course I'm taking, I have to hold a 10 minute talk about the observer pattern. So far these are my points: What is it? (defenition) Polling is an alternative Polling VS Observer When Observer is better When Polling is better (taken from here) A statement that Mediator pattern is worth checking out. (I won't have time to cover it in 10 minutes) I would be happy to hear about: Any suggestions to add something? Another alternative (if exists)

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• ADF Mobile on BlackBerry

  - by Duncan Mills

  Worth checking out: Luc Bors has an article on OTN covering the use of both browser based and native applications written with ADF on BlackBerry. A great overview and of course perfectly timed for you to try this out yourself using the new ADF Mobile Client extension which is available as a technical preview with Oracle JDeveloper PatchSet .

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• Interested in developing JavaFX content for TV?

  - by [email protected]

  If you answered YES to this question, you might be interested in checking out this excellent article written by the JavaFX team entitled, "Tips for Developing to the JavaFX TV Platform."  And with the new JavaFX TV emulator included in JavaFX 1.3, you'll be able to build and prototype TV applications directly on your Windows-based desktop.

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• Delete Perl install files?

  - by Bjorn

  I have a VPS that is managed and am mysteriously running out of space, I think I found a few files I can delete. So just double checking it's ok to delete the Perl install files: /root/perl588installer.tar.gz (pretty sure this can go) /root/perl588installer/ (wasn't sure if this can go, I'm thinking it's just used when perl is installed) I rarely install this kind of thing myself but when I do I'm sure you can delete these files. Thanks

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• MIX 2010 Covert Operations Day 1

  - by GeekAgilistMercenary

  Portland Departure - Farewell Stumptown Off I go on a plane from Portland, Oregon to Las Vegas, Nevada for the MIX 2010 Conference.  Before I even boarded the plane I met Paul Gomes a Senior Software Engineer and Andrew Saylor the Director of Business Development.  Both of these SoftSource Employees were en route to MIX themselves.  Being stoked to already be bumping into some top tier people, I bid them adieu and headed for my seat on the plane. I boarded, and had before the boarding opted for an upgrade.  I have to advise that if you get a chance on Alaska to upgrade at the last minute, take it.  It is usually only about $50 bucks or so and the additional space makes working on the ole' laptop actually possible (even on my monstrous 17" laptop).  So take it from me, click that upgrade button and fork over that $50 bucks for anything over an hour flight, the comfort and ability to work is usually worth it! Las Vegas Arrival - Welcome to Sin City Got into Las Vegas and swung out of the airport.  I then, with my comrade Beth attempted to get Internet Access for the next 3 hours.  Las Vegas, is not the most friendly Internet Access town.  I will just say it, I am not sure why any Internet related company (ala Microsoft) would hold a conference here.  There are more than a dozen other cities that would be better. But I digress, I did manage to get Internet Access after checking into the Circus Circus.  Don't ask why I ended up staying here, if you run into me in person, ask then because there is a whole story to it. At this point I started checking out each session further on the MIX10 Site.  There are a number I deemed necessary to check out.  However, you'll have to read my pending entries to see which session I jumped into. With this juncture in time reached, I got a ton of work to wrap up, some code to write and some sleep to get.  Until tomorrow, adieu. For more of my writing, thoughts, and other topics check out my other blog, where the original entry is posted.

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• Databinder.Eval using Lamda Expressions

  Using lambda expression to help with compile time checking of Eval statements...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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• Mutation Testing

  You may have a twinge of doubt when your code passes all its unit tests. They might say that the code is OK, but if the code is definitely incorrect, will the unit tests fail? Mutation Testing is a relatively simple, but ingenious, way of checking that your tests will spot the fact that your code is malfunctioning. It is definitely something that every developer should be aware of.

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• The Truth About SEO and Site Ranking

  Initially surfing the net was as easy as sending and receiving mails alongside checking for other related information and chatting on live portals. Although no one as at then thought about how all these things were made to work because it mattered less then but now with the dynamism that is associated with the internet it has become imperative to learn other more salient features that makes the internet a Pandora box of some sort.

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• Static site generator with web-based file manager?

  - by user234

  I'm checking around options of static web site generators which led me to lots of articles about them! However, no word is spoken on how to edit files through a browser; it's always assumed you have either DropBox or some FTPish or terminal access. The only generator I could find that includes a browser based admin screen is Kirby (getkirby.com, mentioned at modernstatic.com) Besides the application above, what setup would you recommend to have both static HTML generation and web-based file management? Thanks!

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• Commit Review Questions

  - by Wes McClure

  Note: in this article when I refer to a commit, I mean the commit you plan to share with the rest of the team, if you have local commits that you plan to amend/combine, I am referring to the final result. In time you will find these easier to do as you develop, however, all of these are valuable before checking in!  The pre commit review is a nice time to polish what might have been several hours of intense work, during which these things were the last things on your mind!  If you are concerned about losing your work in the process of responding to these questions, first do a check-in and amend it as you go (assuming you are using a tool such as git that supports this), rolling the result into one nice commit for everyone else.  Did you review your commit, change by change, with a diff utility? If not, this is a list of reasons why you might want to start! Did you test your changes? If the test is valuable to be automated, is it? If it’s a manual testing scenario, did you at least try the basics manually? Are the additions/changes formatted consistently with the rest of the project? Lots of automated tools can help here, don’t try to manually format the code, that’s a waste of time and as a human you will fail repeatedly. Are these consistent: tabs versus spaces, indentation, spacing, braces, line breaks, etc Resharper is a great example of a tool that can automate this for you (.net) Are naming conventions respected? Did you accidently use abbreviations, unless you have a good reason to use them? Does capitalization match the conventions in the project/language? Are files partitioned? Sometimes we add new code in existing files in a pinch, it’s a good idea to split these out if they don’t belong ie: are new classes defined in new files, if this is something your project values? Is there commented out code? If you are removing an existing feature, get rid of it, that is why we have VCS If it’s not done yet, then why are you checking it in? Perhaps a stash commit (git)? Did you leave debug or unnecessary changes? Do you understand all of the changes? http://geekswithblogs.net/wesm/archive/2012/04/11/programming-doesnrsquot-have-to-be-magic.aspx Are there spelling mistakes? Including your commit message! Is your commit message concise? Is there follow up work? Are there tasks you didn’t write down that you need to follow up with? Are readability or reorganization changes needed? This might be amended into the final commit, or it might be future work that needs added to the backlog. Are there other things your team values that you should review?

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• What if(event) statement means in JavaScript?

  - by j flo

  I'm rather new to JavaScript and programming in general so I am pretty much only used to seeing if statements that have some kind of comparison operator like, if (x < 10) or if(myBool). I have seen an if statement checking against an event, but I don't understand what or why the event is being checked like that. What's the semantic meaning behind that check or comparison? Here is the code in question: if(event){ event.preventDefault(); }

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• GUVCVIEW errors

  - by Brian Snapp

  I had GUVCVIEW working once before. it suddenly quit working. This is the error I receive........ bt_audio_service_open: connect() failed: Connection refused (111) bt_audio_service_open: connect() failed: Connection refused (111) bt_audio_service_open: connect() failed: Connection refused (111) bt_audio_service_open: connect() failed: Connection refused (111) video device: /dev/video0 /dev/video0 - device 1 Init. Intergrated Webcam (location: usb-0000:00:1a.7-2) { pixelformat = 'YUYV', description = 'YUV 4:2:2 (YUYV)' } { discrete: width = 640, height = 480 } Time interval between frame: 1/30, 1/20, 1/15, 1/10, 1/5, { discrete: width = 352, height = 288 } Time interval between frame: 1/30, 1/20, 1/15, 1/10, 1/5, { discrete: width = 320, height = 240 } Time interval between frame: 1/30, 1/20, 1/15, 1/10, 1/5, { discrete: width = 176, height = 144 } Time interval between frame: 1/30, 1/20, 1/15, 1/10, 1/5, { discrete: width = 160, height = 120 } Time interval between frame: 1/30, 1/20, 1/15, 1/10, 1/5, { discrete: width = 1024, height = 768 } Time interval between frame: 1/9, 1/5, { discrete: width = 1280, height = 1024 } Time interval between frame: 1/9, 1/5, checking format: 1196444237 Format unavailable: 1196444237. Init v4L2 failed !! Init video returned -2 trying minimum setup ... video device: /dev/video0 /dev/video0 - device 1 Init. Intergrated Webcam (location: usb-0000:00:1a.7-2) { pixelformat = 'YUYV', description = 'YUV 4:2:2 (YUYV)' } { discrete: width = 640, height = 480 } Time interval between frame: 1/30, 1/20, 1/15, 1/10, 1/5, { discrete: width = 352, height = 288 } Time interval between frame: 1/30, 1/20, 1/15, 1/10, 1/5, { discrete: width = 320, height = 240 } Time interval between frame: 1/30, 1/20, 1/15, 1/10, 1/5, { discrete: width = 176, height = 144 } Time interval between frame: 1/30, 1/20, 1/15, 1/10, 1/5, { discrete: width = 160, height = 120 } Time interval between frame: 1/30, 1/20, 1/15, 1/10, 1/5, { discrete: width = 1024, height = 768 } Time interval between frame: 1/9, 1/5, { discrete: width = 1280, height = 1024 } Time interval between frame: 1/9, 1/5, checking format: 1448695129 Requested Format unavailable: get width 640 height 480 vid:0c45 pid:6410 driver:uvcvideo (guvcview:4079): Gtk-CRITICAL **: gtk_hscale_new_with_range: assertion `min < max' failed (guvcview:4079): Gtk-CRITICAL **: gtk_scale_set_draw_value: assertion `GTK_IS_SCALE (scale)' failed Segmentation fault I suppose the problem lies in the fact, that I cannot locate a configuration file to edit. Any help in where this file may lie? I have tried searching for any/everything related to guvcview, and have had zero success. Thank you for taking the time to read this, and hopefully providing a solution..

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• StrongVPN on Ubuntu: Simple VPN Solution That Works

  <b>Linx Pro Magazine:</b> "Ask any knowledgeable mobile user, and she will tell you that the best way to securely access the Internet in public places is through a VPN (virtual private network) connection. So if you enjoy sipping coffee at a local cafe while checking email and browsing the Web, a secure VPN connection is a good solution..."

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• Explanation of the definition of interface inheritance as described in GoF book

  - by Geek

  I am reading the first chapter of the Gof book. Section 1.6 discusses about class vs interface inheritance: Class versus Interface Inheritance It's important to understand the difference between an object's class and its type. An object's class defines how the object is implemented.The class defines the object's internal state and the implementation of its operations.In contrast,an object's type only refers to its interface--the set of requests on which it can respond. An object can have many types, and objects of different classes can have the same type. Of course, there's a close relationship between class and type. Because a class defines the operations an object can perform, it also defines the object's type . When we say that an object is an instance of a class, we imply that the object supports the interface defined by the class. Languages like c++ and Eiffel use classes to specify both an object's type and its implementation. Smalltalk programs do not declare the types of variables; consequently,the compiler does not check that the types of objects assigned to a variable are subtypes of the variable's type. Sending a message requires checking that the class of the receiver implements the message, but it doesn't require checking that the receiver is an instance of a particular class. It's also important to understand the difference between class inheritance and interface inheritance (or subtyping). Class inheritance defines an object's implementation in terms of another object's implementation. In short, it's a mechanism for code and representation sharing. In contrast,interface inheritance(or subtyping) describes when an object can be used in place of another. I am familiar with the Java and JavaScript programming language and not really familiar with either C++ or Smalltalk or Eiffel as mentioned here. So I am trying to map the concepts discussed here to Java's way of doing classes, inheritance and interfaces. This is how I think of of these concepts in Java: In Java a class is always a blueprint for the objects it produces and what interface(as in "set of all possible requests that the object can respond to") an object of that class possess is defined during compilation stage only because the class of the object would have implemented those interfaces. The requests that an object of that class can respond to is the set of all the methods that are in the class(including those implemented for the interfaces that this class implements). My specific questions are: Am I right in saying that Java's way is more similar to C++ as described in the third paragraph. I do not understand what is meant by interface inheritance in the last paragraph. In Java interface inheritance is one interface extending from another interface. But I think the word interface has some other overloaded meaning here. Can some one provide an example in Java of what is meant by interface inheritance here so that I understand it better?

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• Need Help in Pointing to focus on the Key elements in Code Review Phase?

  - by Sankar Ganesh

  Hi Friends, Let us share your views on the Code Review process, If someone gave a code snippet and ask you to review that code, then what are the major things you will focus on that code Review process. For Instance: I will check any dead code is available in that code, other than Checking Dead Code, what are the key elements to be focused on CODE REVIEW PROCESS. Thanks For Sharing Your Views Sankar Ganesh.S

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• Using Url Rewrite to Block Page Requests

  - by The Official Microsoft IIS Site

  The other day I was checking the traffic stats for my WordPress blog to see which of my posts were the most popular. I was a little concerned to see that wp-login.php was in the Top 5 total requests almost every month. Since I’m the only author on my blog my logins could not possibly account for the traffic hitting that page. The only explanation could be that the additional traffic was coming from automated hacking attempts. Any server administrator concerned about security knows that “ footprinting...(read more)

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• CAPTCHA blocking for my scraping script?

  - by Surabhil Sergy

  I am working on a scraping project which involves getting web data and parsing them for further use. I have been working using PHP and CURL to make scraping scripts which crawls web data and I make use of either PHP Dom or Simple HTML DOM Parser library for these kinds of projects. On a recent project I encountered some challenges; initially I found the target website blocked my server IP such that the server could not make any successful requests to the site. Understanding these issues as common I bought a set of private proxies and tried to make request calls using them. Though this could get successful response, I noticed the script is getting some kind of blocks after 2-3 continuous requests. On printing and checking the response I could see a pop-up asking for CAPTCHA validation. I could not see any captcha characters to be entered and it also shows an error “input error: invalid referrer”. On examining the source I could see some Google recaptcha scripts within. I’m stuck at this point and I m not able to execute my script. My script is used for gathering data and it needs to go through a large number of pages periodically over the site. But in the current scenario I am not able to proceed with my script. I could see there are some options to overcome these captcha issues and scraping these kinds of sites too are common. I have been checking my script performance and responses over last two months. I could see during first month I was able to execute very large number of requests from a single IP and I was able to get results. Later I get an IP block and used private proxies which could get me some results. Later I am facing now with the captcha trouble. I would appreciate any help or suggestions in this regard. (Often in this kind of questions I used to get a first comment as, ‘Have you asked for prior permission from the target?’ .I haven’t ,but I know there are many sites doing so to get the details out of sites and target sites may not often give access to them. I respect the legality and scraping etiquettes but I would like to know at what point I stuck and how could I overcome that! ) I could provide any supporting information if needed.

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• Simple Query tuning with STATISTICS IO and Execution plans

  A great deal can be gleaned from the use of the STATISTICS IO and the execution plan, when you are checking that a query is performing properly. Josef Richberg, the current holder of the 'Exceptional DBA' award, explains how an apparently draconian IT policy turns out to be a useful ways of ensuring that Stored Procedures are carefully checked for performance before they are released

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• How to disable Chrome's Incognito Mode?

  - by Jason Tu

  I use this extension called Website Blocker to discourage me from checking Gmail/Reddit. However, it is easy and tempting to open a New Incognito Window; since extensions are disabled in Incognito Mode, I'm still able to browse Gmail/Reddit in this manner. Is there any way to disable Chrome's Incognito Mode in Ubuntu? Ideally, this would encourage me to use my smartphone as a dedicated Gmail/Reddit checker.

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• Maps for Africa

  - by samkea

  My friends and some people from i-network Uganda, have been requesting me to help them with some international maps. I have uploaded these ones here, you can download and re-use them. They are not so upto-date but are the one s i use. I will continue posting any updates here and will remove the older ones if need be. Enjoy! Africa Bounderies: http://cid-5e33c7b2ca3aa2a9.skydrive.live.com/self.aspx/Maps/0412010AdminBdries^_Africa.rar   I will be posting others soon, keep checking....

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• Why doesn't Haskell have type-level lambda abstractions?

  - by Petr Pudlák

  Are there some theoretical reasons for that (like that the type checking or type inference would become undecidable), or practical reasons (too difficult to implement properly)? Currently, we can wrap things into newtype like newtype Pair a = Pair (a, a) and then have Pair :: * -> * but we cannot do something like ?(a:*). (a,a). (There are some languages that have them, for example, Scala does.)

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• Failed 12.04 installation

  - by Rob Sayer

  I tried installing Ubuntu 12.04 today. Not an upgrade, a new installation. It didn't work. My computer specs: Computer: Compaq presario CQ-104CA OS: Windows 7 Home 64 bit CPU: AMD V140 BIOS: latest Graphics: amd m880g with ati mobility radeon hd 4250 Wireless: atheros ar9285 Internal HD:SATA I wasn't connected to the internet at the time ... I know of a number of people who have installed ubuntu unconnected and just updated later. It seemed to go normally until I got to the part where I chose to install dual boot linux/windows. Then, the screen went black and the following test appeared (I left out the [OK]'s): checking battery state starting crash report submission daemon stating cpu interrupts balancing daemon stopping system V runlevel compatibility starting configure network device security stopping configure network device security stopping cold plug devices stopping log initial device creation starting enable remaining boot-time encrypting devices starting configure network device security starting save udev log and update rules stopping save udev log and update rules stopping enable remaining boot-time encrypted block devices checking for running unattended-upgrades acpid: exiting speech-dispatcher disabled: edit /etc/default/speech-disorder At this point, the CD is ejected. Then nothing. If I press the return key, it boots Windows. I don't think that's what's supposed to happen. Thinking the cd media or dvd drive may have been faulty, I downloaded the .iso again and made a bootable USB stick, as per your instructions. This time there was no cryptic crash screen. It just booted windows. I can't find any log files it may have left. Thinking the amd64 version may have been the wrong one, I tried downloading the x86 version. Same thing, both from cd and usb drive. Note I downloaded both files twice. I doubt it was a corrupted d/l. This is supposed to be a simple, transparent install. I went to the time and trouble of looking up my devices and drivers re ubuntu beforehand, and was prepared to do some configuration, though I know someone who has the same wireless device and his worked righted out of the box. But I spent over 3 hours trying to install it with only the above to show for it.

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• Upgrade from 13.04 to 13.10 fails

  - by John

  Tried to upgrade my computer from 13.04 to 13.10, but directly after pressing the upgrade, a couple files appear to download, and then the window disappears and nothing happens... I tried it from the terminal window and this is the output (same result) jessijo@halesite3:~$ update-manager Checking for a new Ubuntu release authenticate 'saucy.tar.gz' against 'saucy.tar.gz.gpg' extracting 'saucy.tar.gz' Real-time signal 0 Any ideas?

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• How do I implement collision detection with a sprite walking up a rocky-terrain hill?

  - by detectivecalcite

  I'm working in SDL and have bounding rectangles for collisions set up for each frame of the sprite's animation. However, I recently stumbled upon the issue of putting together collisions for characters walking up and down hills/slopes with irregularly curved or rocky terrain - what's a good way to do collisions for that type of situation? Per-pixel? Loading up the points of the incline and doing player-line collision checking? Should I use bounding rectangles in general or circle collision detection?

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• Object detection in bitmap JavaScript canvas

  - by fallenAngel

  I want to detect clicks on canvas elements which are drawn using paths. So far I have stored element paths in a JavaScript data structure and then check the coordinates of hits which match the element's coordinates. Rendering each element path and checking the hits would be inefficient when there are a lot of elements. I believe there must be an algorithm for this kind of coordinate search, can anyone help me with this?

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