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• xorg-edgers PPA with llvmpipe breaks AMD APU system

  - by linux_RRT

  I've read before where this had happened to another user with the same system... I was running Ubuntu 12.04 LTS with Kernel 3.2.0.29 and decided to give xorg-edgers a try. I purged fglrx* and xorg* before beginning. I upgraded with sudo apt-get upgrade -d The system downloaded and installed 109MB worth of data to the system, including llvmpipe which I am very unfamiliar with, and Kernel 3.5.0.11. The system was then rebooted to finalize the upgrade. The system boots to a black screen and then tells me "The system is running in low-graphics mode". Did I miss a step in the install? Or do the newest open-source drivers just not work with my hardware? I realize this hardware (APU) is some of the newer development. I dropped to command via the fallback menu and attempted to boot lightdm as root, but the system hangs in 'Configuring kernel parameters' at Starting initializes zram swaping. ...and then it just sits there. The other thing that concerns me is the output at the top of the screen that says: could not write bytes: Broken pipe Does llvmpipe work for this type of system? To be clear the system is: MSI x370-206us Laptop Radeon HD 6320 AMD e450 APU 1.67ghz dual-core Any help would be much appreciated. Like I said, I'm pretty sure I followed the right order of operations for the install procedure, but I was curious if anyone with similar hardware had experienced anything similar.

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• SDL mouse wheel not picking up

  - by Chris

  Running Ubuntu 11.04, SDL 1.2 trying to pickup mouse wheel up/down movement with this (stripped down) code: int main( int argc, char **argv ) { SDL_MouseButtonEvent *mousebutton = NULL; while ( !done ) { if(mousebutton != NULL && mousebutton->button == SDL_BUTTON_LEFT) yrot += 0.75f; else if(mousebutton != NULL && mousebutton->button == SDL_BUTTON_RIGHT) yrot -= 0.75f; else if(mousebutton != NULL && mousebutton->button == SDL_BUTTON_WHEELUP){ xrot += 0.75f; }else if(mousebutton != NULL && mousebutton->button == SDL_BUTTON_WHEELDOWN){ xrot -= 0.75f; } while ( SDL_PollEvent( &event ) ) { switch( event.type ) { case SDL_MOUSEBUTTONDOWN: mousebutton = &event.button; break; case SDL_MOUSEBUTTONUP: mousebutton = NULL; break; default: break; } } } return 0; } strange thing is, scrolling with the mouse button does nothing, but if I hold down a mouse button or two and then move the mouse it hits the SDL_BUTTON_WHEEL code occasionally. This honestly reeks of a pointer issue, which would make sense since I've been spoiled with C# for the past couple years, but I am just not seeing it. How do i correctly find mouse scroll events in SDL?

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• Synchronous vs. asynchronous for publish subscribe communication between JavaScript objects

  - by natlee75

  I implemented the publish subscribe pattern in a JavaScript module to be used by entirely client-side oriented JavaScript objects. This module has nothing to do with client-server communications in any way, shape or form. My question is whether it's better for the publish method in such a module to be synchronous or asynchronous, and why. As a very simplified example let's say I'm building a custom UI for an HTML5 video player widget: One of my modules is the "video" module that contains the VIDEO element and handles the various features and events associated with that element. This would probably have a namespace something like "widgets.player.video." Another is the "controls" module that has the various buttons - play, pause, volume, scrub, fullscreen, etc. This might have a namespace along the lines of "widgets.player.controls." These two modules are children of a parent "player" module ("widgets.player" ??), and as such would have no inherent knowledge of each other when instantiated as children of the "player" object. The "controls" elements would obviously need to be able to effect some changes on the video (click "Play" and the video should play), and vice versa (video's "timeUpdate" event fires and the visual display of the current time in the controls should update). I could tightly couple these modules and pass references to each other, but I'd rather take a more loosely coupled approach by setting up a pubsub type module that both can subscribe to and publish from. SO (thanks for bearing with me) in this kind of a scenario is there an advantage one way or another for synchronous publication versus asynchronous publication? I've seen some solutions posted online that allow for either/or with a boolean flag whereas others automatically do it asynchronously. I haven't personally seen an implementation that just automatically goes with synchronous publication... is this because there's no advantage to it? I know that I can accomplish this with features provided by jQuery, but it seems that there may be too much overhead involved here. The publish subscribe pattern can be implemented with relatively lightweight code designed specifically for this particular purpose so I'd rather go with that then a more general purpose eventing system like jQuery's (which I'll use for more general eventing needs :-).

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• F# Simple Twitter Update

  - by mroberts

  A short while ago I posted some code for a C# twitter update.  I decided to move the same functionality / logic to F#.  Here is what I came up with. 1: namespace Server.Actions 2:   3: open System 4: open System.IO 5: open System.Net 6: open System.Text 7:   8: type public TwitterUpdate() = 9: 10: //member variables 11: [<DefaultValue>] val mutable _body : string 12: [<DefaultValue>] val mutable _userName : string 13: [<DefaultValue>] val mutable _password : string 14:   15: //Properties 16: member this.Body with get() = this._body and set(value) = this._body <- value 17: member this.UserName with get() = this._userName and set(value) = this._userName <- value 18: member this.Password with get() = this._password and set(value) = this._password <- value 19:   20: //Methods 21: member this.Execute() = 22: let login = String.Format("{0}:{1}", this._userName, this._password) 23: let creds = Convert.ToBase64String(Encoding.ASCII.GetBytes(login)) 24: let tweet = Encoding.ASCII.GetBytes(String.Format("status={0}", this._body)) 25: let request = WebRequest.Create("http://twitter.com/statuses/update.xml") :?> HttpWebRequest 26: 27: request.Method <- "POST" 28: request.ServicePoint.Expect100Continue <- false 29: request.Headers.Add("Authorization", String.Format("Basic {0}", creds)) 30: request.ContentType <- "application/x-www-form-urlencoded" 31: request.ContentLength <- int64 tweet.Length 32: 33: let reqStream = request.GetRequestStream() 34: reqStream.Write(tweet, 0, tweet.Length) 35: reqStream.Close() 36:   37: let response = request.GetResponse() :?> HttpWebResponse 38:   39: match response.StatusCode with 40: | HttpStatusCode.OK -> true 41: | _ -> false   While the above seems to work, it feels to me like it is not taking advantage of some functional concepts.  Love to get some feedback as to how to make the above more “functional” in nature.  For example, I don’t like the mutable properties.

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• Font corruption: lines through characters

  - by Aibara Iduas

  I have an odd problem where a one-pixel high white line is displayed through certain letters of text. Almost always only a single character type is affected at once, and only in one font size (though that size can change over time). Most of the time things are fine, but this happens several times a day. It's been happening ever since I upgraded to 10.10. I have noticed few patterns: It might be a problem with Firefox (I'm currently using the nightly ppa, but it occurred in 3.6 also) - but this could just be because I spend most of my time on my computer either at a browser or text editors. I seem to remember it happening with the buttons on various Gnome dialogs. It never occurs in text I've typed, be it an email, url bar, etc. In Firefox it happens across tabs, and the problem remains even if they are closed or reloaded; only restarting the program can fix it. Two examples (in the first, only the larger "r" is corrupted): Any help would be appreciated, thanks.

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• Philosophy behind the memento pattern

  - by TheSilverBullet

  I have been reading up on memento pattern from various sources of the internet. Differing information from different sources has left me in confusion regarding why this pattern is actually needed. The dofactory implementation says that the primary intention of this pattern is to restore the state of the system. Wiki says that the primary intention is to be able to restore the changes on the system. This gives a different impact - saying that it is possible for a system to have memento implementation with no need to restore. And that ability of restore is a feature of this. OODesign says that It is sometimes necessary to capture the internal state of an object at some point and have the ability to restore the object to that state later in time. Such a case is useful in case of error or failure. So, my question is why exactly do we use this one? Is it to save previous states - or to promote encapsulation between the Caretaker and the Memento? Why is this type of encapsulation so important? Edit: For those visiting, check out this Implementation!

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• loading splash screen takes priority over terminal or windows manager while running elsa

  - by schonjones

  I recently installed e17 and was trying to set up defaults to use elsa and ecomorph over the standard compiz as it constantly crashes since updating to 12.04. If elsa is installed the loading screen hangs and never loads to login, however i can get to a terminal or the e17 login instead of the standard gdm that usually shows up, within a second the screen goes back to the loading screen. I can still type and login as well as run commands in the terminal, but all I see is the loading screen. Switching between terminals i can confirm my commands before it switches back to the loading screen. If i remove elsa the loading screen hangs, but I can get to a terminal login and run lightdm to start my session with no problems. I have multiple DE installed and am unsure which loading screen is coming up. i think it's the KDE screen, grub comes up with a debian background if that helps. I'm not sure if i can switch the loading screen and resolve this issue or if i'm just going to have to scrap using elsa and get lightdm to load on boot again. Elsa would be my preference. I don't have the space to backup my files for a complete reinstall. Please help!

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• How to implement child-parent aggregation link in C++?

  - by Giorgio

  Suppose that I have three classes P, C1, C2, composition (strong aggregation) relations between P <>- C1 and P <>- C2, i.e. every instance of P contains an instance of C1 and an instance of C2, which are destroyed when the parent P instance is destroyed. an association relation between instances of C1 and C2 (not necessarily between children of the same P). To implement this, in C++ I normally define three classes P, C1, C2, define two member variables of P of type boost::shared_ptr<C1>, boost::shared_ptr<C2>, and initialize them with newly created objects in P's constructor, implement the relation between C1 and C2 using a boost::weak_ptr<C2> member variable in C1 and a boost::weak_ptr<C1> member variable in C2 that can be set later via appropriate methods, when the relation is established. Now, I also would like to have a link from each C1 and C2 object to its P parent object. What is a good way to implement this? My current idea is to use a simple constant raw pointer (P * const) that is set from the constructor of P (which, in turn, calls the constructors of C1 and C2), i.e. something like: class C1 { public: C1(P * const p, ...) : paren(p) { ... } private: P * const parent; ... }; class P { public: P(...) : childC1(new C1(this, ...)) ... { ... } private: boost::shared_ptr<C1> childC1; ... }; Honestly I see no risk in using a private constant raw pointer in this way but I know that raw pointers are often frowned upon in C++ so I was wondering if there is an alternative solution.

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• One site being on a subdirectory of another. Does google count this against you?

  - by Mick

  I have created two similar websites (relating to monetary systems). So far, one appears to be loved by Google and the other hated. I'm struggling to work out why. This is a mystery to me because both sites were created by me with the same design philosophy, both in pure html. Both are packed to the rafters with references to, and information about, their respective subjects. One issue I'm worried may be the cause is to do with the location of the sites. I got a web hosting package from hostmonster.com for the successful one, but less liked one is just an "add-on" which sits on a subdirectory of the successful one. I wonder if Google somehow detects this and treats it as a less significant website? EDIT: Just to clarify, even though one site is an add-on that sits on a subdirectory of the other, the URL is arranged to look like it is a root. I.e. the unpopular site can be accessed directly with a simple www.myunpopularsite.com name, without specifying any subdirectory. EDIT: Just in case its important... say the popular site is called pop.com and the unpopular one unpop.com. In the webspace I've purchased, there is a directory called public_html. This is where I put the index.htm and all the other files of my popular site. When I purchased the add-on unpop.com. I made a subdirectory of public_html called unpop. It is within this "public_html\unpop\" that I place the index.htm and all the other files of my unpopular site. Typing www.unpop.com into the address bar of a browser links directly to the contents of "public_html\unpop\" and the user is not aware that this site is sitting on a subdirectory of another site. BUT if you type "www.pop.com/unpop" into the address bar of a browser you DO see the unpopular site.

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• How bad it's have two methods with the same name but differents signatures in two classes?

  - by Super User

  I have a design problem relationated with the public interface, the names of methods and the understanding of my API and my code. I have two classes like this: class A: ... function collision(self): .... ... class B: .... function _collision(self, another_object, l, r, t, b): .... The first class have one public method named collision and the second have one private method called _collision. The two methods differs in arguments type and number. In the API _m method is private. For the example let's say that the _collision method checks if the object is colliding with another_ object with certain conditions l, r, t, b (for example, collide the left side, the right side, etc) and returns true or false according to the case. The collision method, on the other hand, resolves all the collisions of the object with other objects. The two methods have the same name because I think is better avoid overload the design with different names for methods who do almost the same think, but in distinct contexts and classes. This is clear enough to the reader or I should change the method's name?

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• How to improve Minecraft-esque voxel world performance?

  - by SomeXnaChump

  After playing Minecraft I marveled a bit at its large worlds but at the same time I found them extremely slow to navigate, even with a quad core and meaty graphics card. Now I assume Minecraft is fairly slow because: A) It's written in Java, and as most of the spatial partitioning and memory management activities happen in there, it would naturally be slower than a native C++ version. B) It doesn't partition its world very well. I could be wrong on both assumptions; however it got me thinking about the best way to manage large voxel worlds. As it is a true 3D world, where a block can exist in any part of the world, it is basically a big 3D array [x][y][z], where each block in the world has a type (i.e BlockType.Empty = 0, BlockType.Dirt = 1 etc.) Now, I am assuming to make this sort of world perform well you would need to: A) Use a tree of some variety (oct/kd/bsp) to split all the cubes out; it seems like an oct/kd would be the better option as you can just partition on a per cube level not a per triangle level. B) Use some algorithm to work out which blocks can currently be seen, as blocks closer to the user could obfuscate the blocks behind, making it pointless to render them. C) Keep the block object themselves lightweight, so it is quick to add and remove them from the trees. I guess there is no right answer to this, but I would be interested to see peoples' opinions on the subject. How would you improve performance in a large voxel-based world?

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• Oracle SOA Suite for healthcare integration Dashboard

  - by Nitesh Jain

  Oracle SOA Suite Healthcare came up with a new way of monitoring where user can configure a dashboard and follow the dynamic runtime changes.Oracle SOA Suite for healthcare integration dashboards display information about the current health of the endpoints in a healthcare integration application. You can create and configure multiple dashboards as needed to monitor the status and volume metrics for the endpoints you have defined. The Dashboards reflects changes that occur in the runtime repository, such as purging runtime instance data, new messages processed, and new error messages. You can display data for various time periods, and you can manually refresh the data in real time or set the dashboard to automatically refresh at set intervals.Dashboard shows the following information: Status: The current status of the endpoint, such as Running, Idle, Disabled, or Errors. Messages Sent: The number of messages sent by the endpoint in the specified time period. Messages Received: The number of messages received by the endpoint in the specified time period. Errors: The number of messages with errors for the endpoint in the given time period. Last Sent: The date and time the last message was sent from the endpoint. Last Received: The date and time the last message was received from the endpoint. Last Error: The date and time of the last error for the endpoint.  It also shows the detailed view of a specific Endpoint The document type. The number of messages received per second. The total number of message processed in the specified time period. The average size of each message.

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• Virtual Pageview Goal Funnel Not Tracking Correctly

  - by cphill

  I have an AJAX form that has three stages: 1. The landing page where a user fills out a form and selects between three question sets and clicks begin assessment 2. The assessment page, where users fill out questions relating to the question set that they selected on the landing page. 3.The results page, which shows whether they are at High Risk or Low Risk. Since this is an AJAX form that does not open a new page for each step of the process, I implemented a virtual pageview that would fire on the pageload of each step of the form process. The following is my virtual pageview setup for each stage: /form/begin-assessment /form/assessment/* (* = Three different virtual pageviews depending on the users selection of the three sets of questions: /one, /two, /three) 3./form/finished-assessment I have set up three separate goals to track user progress through each step of the form assessment. Here is my Goal setup: Goal Description: -Goal Type: Destination Goal Details: -Destination: /form/finished-assessment -Funnel: On Step 1: /form/begin-assessment (Required: Yes) Step 2: /form/assessment/one (Step 2: replace /one with /two or /three and you have my two other goals setup) Now my goals are recording the correct data in the first step and show the completions in the destination, but the second step does not show any drop offs. They show the same data as the destination. Any ideas of how I set up the goals wrong?

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• Creating a Sandboxed Instance

  - by Ricardo Peres

  In .NET 4.0 the policy APIs have changed a bit. Here's how you can create a sandboxed instance of a type, which must inherit from MarshalByRefObject: static T CreateRestrictedType<T>(SecurityZone zone, params Assembly [] fullTrustAssemblies) where T : MarshalByRefObject, new() { return(CreateRestrictedType<T>(zone, fullTrustAssemblies, new IPermission [0]); } static T CreateRestrictedType<T>(SecurityZone zone, params IPermission [] additionalPermissions) where T : MarshalByRefObject, new() { return(CreateRestrictedType<T>(zone, new Assembly [0], additionalPermissions); } static T CreateRestrictedType<T>(SecurityZone zone, Assembly [] fullTrustAssemblies, IPermission [] additionalPermissions) where T : MarshalByRefObject, new() { Evidence evidence = new Evidence(); evidence.AddHostEvidence(new Zone(zone)); PermissionSet evidencePermissionSet = SecurityManager.GetStandardSandbox(evidence); foreach (IPermission permission in additionalPermissions ?? new IPermission[ 0 ]) { evidencePermissionSet.AddPermission(permission); } StrongName [] strongNames = (fullTrustAssemblies ?? new Assembly[0]).Select(a = a.Evidence.GetHostEvidence<StrongName>()).ToArray(); AppDomainSetup adSetup = new AppDomainSetup(); adSetup.ApplicationBase = Path.GetDirectoryName(typeof(T).Assembly.Location); AppDomain newDomain = AppDomain.CreateDomain("Sandbox", evidence, adSetup, evidencePermissionSet, strongNames); ObjectHandle handle = Activator.CreateInstanceFrom(newDomain, typeof(T).Assembly.ManifestModule.FullyQualifiedName, typeof(T).FullName); return (handle.Unwrap() as T); } SyntaxHighlighter.config.clipboardSwf = 'http://alexgorbatchev.com/pub/sh/2.0.320/scripts/clipboard.swf'; SyntaxHighlighter.brushes.CSharp.aliases = ['c#', 'c-sharp', 'csharp']; SyntaxHighlighter.all();

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• Getting "Unable to find a medium containing a live file system" when installing 10.10

  - by Krastin Konstantinov

  I got this error while trying to install ubuntu 10.10 from a bootable USB stick on to Sony Vaio P series laptop. The disk boots into the language and installation type screen. After that it goes through the splash and pulls up this error: BusyBox v1.13.3 (Ubuntu 1:1.13.3-ubuntu11) built in shell (ash) Enter 'help' for a list of built-in commands. (initramfs) Unable to find a medium containing a live file system After getting this error the installation fails to start. I have used the same USB stick on some other laptops and the installation started as usual. Any help will be appreciated. My installation is i386 and my machine is Vaio P VGN-P610. I've tried every possible thing: Bios: [enable boot external] Boot order: [external] [hard drive] [network boot] Tried 2 different USB drives Tried 2 different external CD drives Tried 6 different downloads of both the desktop and netbook remix. All downloads were checked with MD5SUM. Ubuntu Desktop 9.10 installs properly in every version and from every source. Getting reaaaally frustrated.

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• DVD-drive detected by BIOS and UEFI but not by Ubuntu 12.04

  - by user97591

  I have build a new tower containing; Asrock Z77 extreme4 (motherboard) Core i7 (processor) Hitachi LGE-DMGH 12 L (B) GH15F SATA (SATA DVD-drive) Problem is; BIOS and UEFI has no problems detecting the DVD-drive but it is not detected by Ubuntu 12.04. It is not present in /etc/fstab or /etc/mtab. Below is the contents of fstab and mtab. Thanks for all your help. fstab: # <file system> <mount point> <type> <options> <dump> <pass> proc /proc proc nodev,noexec,nosuid 0 0 # / was on /dev/sda1 during installation UUID=f007bc60-da4c-4f36-99a7-77083c5f3654 / ext4 errors=remount-ro 0 1 # swap was on /dev/sda5 during installation UUID=5d59949c-aed9-442a-877d-5abf1ccaadc3 none swap sw 0 0 mtab: /dev/sda1 / ext4 rw,errors=remount-ro 0 0 proc /proc proc rw,noexec,nosuid,nodev 0 0 sysfs /sys sysfs rw,noexec,nosuid,nodev 0 0 none /sys/fs/fuse/connections fusectl rw 0 0 none /sys/kernel/debug debugfs rw 0 0 none /sys/kernel/security securityfs rw 0 0 udev /dev devtmpfs rw,mode=0755 0 0 devpts /dev/pts devpts rw,noexec,nosuid,gid=5,mode=0620 0 0 tmpfs /run tmpfs rw,noexec,nosuid,size=10%,mode=0755 0 0 none /run/lock tmpfs rw,noexec,nosuid,nodev,size=5242880 0 0 none /run/shm tmpfs rw,nosuid,nodev 0 0 binfmt_misc /proc/sys/fs/binfmt_misc binfmt_misc rw,noexec,nosuid,nodev 0 0 gvfs-fuse-daemon /home/tom/.gvfs fuse.gvfs-fuse-daemon rw,nosuid,nodev,user=tom 0 0

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• Where to install boot loader on a Zenbook Prime?

  - by Christians

  I cannot figure out where to install the boot loader on my Zenbook UX31A Prime. I have installed Ubuntu many times on normal hard drives, but this is the first SSD and I am struggling. Installed Ubuntu 12.04 64-bit selecting "UEFI: general" boot entry. Installation type: Something Else Created partition /sda5 mount as /, /sda6 mount as /home, /sda7 mount as swap Selected /dev/sda for boot loader installation. Other options are /dev/sda, /dev/sda1/dev/sda3 Windows 7 (loader) ... Grub comes up with 6 entries Ubuntu - this runs great Linux 3.2.0-29-generic recovery mode: mode hangs with "fb: conflicting fb hw usae interdrnfb vs EFI VGA - removing generic adapter" memtest86:erro: unknown command `linux 16' memtest86 serial: unknown command `linux 16' Windows 7 (loader) (on /dev/sda3): invalid EFI file path Windows Recovery Environment (on /dev/sda8): unknown command drivemap, invalid EFI file path. My workaround for booting Windows 7 is hitting ESC during boot, windows boot manager comes up and * for booting into Windows 7 I select "WIndows Boot Manager (PO: SanDisk ....". * for booting into Ubuntu I select ubuntu (P0: SanDisk...) How can I boot into Windows from Grub?

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• Should you always pass the bare minimum data needed into a function

  - by Anders Holmström

  Let's say I have a function IsAdmin that checks whether a user is an admin. Let's also say that the admin checking is done by matching user id, name and password against some sort of rule (not important). In my head there are then two possible function signatures for this: public bool IsAdmin(User user); public bool IsAdmin(int id, string name, string password); I most often go for the second type of signature, thinking that: The function signature gives the reader a lot more info The logic contained inside the function doesn't have to know about the User class It usually results in slightly less code inside the function However I sometimes question this approach, and also realize that at some point it would become unwieldy. If for example a function would map between ten different object fields into a resulting bool I would obviously send in the entire object. But apart from a stark example like that I can't see a reason to pass in the actual object. I would appreciate any arguments for either style, as well as any general observations you might offer. I program in both object oriented and functional styles, so the question should be seen as regarding any and all idioms.

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• Hot Off the Press - Oracle Exadata: A Data Management Tipping Point

  - by kimberly.billings

  Advances in data-management architecture - including CPU, memory, storage, I/O, and the database - have been steady but piecemeal. In this report, Merv Adrian describes how Oracle Exadata not only provides the latest technology in each part of the data-management architecture, but also integrates them under the full control of one vendor with a unified approach to leveraging the full stack. He writes, "the real "secret sauce" of Oracle Exadata V2 is the way in which these technologies complement each other to deliver additional performance and scalability." Merv interviews two Exadata customers, Banco Transylvania and TUI Netherlands, and concludes that early indications are that Oracle Exadata is delivering on its promise of extreme performance and scalability. His recommendation to IT is to target corporate applications with the biggest potential for speed-based enhancement, and consider whether Oracle Exadata V2 can cost-effectively enable new ways to use these for competitive advantage. Read the full report. var gaJsHost = (("https:" == document.location.protocol) ? "https://ssl." : "http://www."); document.write(unescape("%3Cscript src='" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'%3E%3C/script%3E")); try { var pageTracker = _gat._getTracker("UA-13185312-1"); pageTracker._trackPageview(); } catch(err) {}

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• Why does 301 redirect work for http but not for https?

  - by Tom G

  Through my domain registrar I have set up a domain, essayme.co.uk, to automatically forward to https://google.com. If I go to http://essayme.co.uk it works as expected and redirects me to https://google.com. $curl -i http://essayme.co.uk HTTP/1.1 301 Moved Permanently Cache-Control: max-age=900 Content-Type: text/html Location: https://google.com Server: Microsoft-IIS/7.5 X-AspNet-Version: 4.0.30319 X-Powered-By: ASP.NET Date: Sat, 07 Jun 2014 11:14:16 GMT Content-Length: 0 Age: 0 Connection: keep-alive However, if I go to https://essayme.co.uk it just freezes and times out. $curl -i https://essayme.co.uk curl: (7) Failed connect to essayme.co.uk:443; Operation timed out What is happening in the second case? (and, if possible, how can I get the redirect to work for https?) Problem background/clarification: I don't have an SSL certificate for the essayme.co.uk domain above, but I do for my live domain (let's call it mywebsite.com), and I was seeing the exact same problem on this domain (hence why I'm trying to debug the problem). Unfortunately I can't experiment with the live domain (as it's live) and I would like to avoid having to buy a second certificate for essayme.co.uk just for debugging (unless absolutely necessary). The problem I was seeing: my live domain, mywebsite.com (not its real name), has a valid SSL certificate. Visiting https://www.mywebsite.com displayed the webpage as expected. I had set up forwarding (like in the question above) from the naked domain (mywebsite.com) to https://www.mywebsite.com) Visiting http://mywebsite.com redirected to https://www.mywebsite.com as expected. However, visiting https://mywebsite.com would freeze and time out (as in the question above). I also tried forwarding it to http://www.otherwebsite.com as an experiment (i.e. forwarding to another site that does not use SSL), but the result was the same: Visiting http://mywebsite.com redirected to http://www.otherwebsite.com as expected. Visiting https://mywebsite.com would freeze and time out again. So I set up essayme.co.uk as an experiment to try and understand why it doesn't work.

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• Putting DSMD into Remission

  - by Justin Greenwood

  As a programmer with over ten years of professional experience, I've often suffered from DSMD (distraction surplus/motivation deficit) disorder. I know I'm not alone. Many of my colleagues have shared their experiences with this productivity cancer to me in support groups or in moments of inebriated intimacy. Often, I observe friends unknowingly surrendering to it - sitting at their computer, cycling through the same set of web sites (blogs, facebook, youtube, news providers, wikipeida, etc.), over and over again. Intermittently, they get up, take a walk around the office, make small talk with their colleagues, get another cup of coffee, then sit down and start the cycle all over again. It is completely controlled by the subconscious mind and will destroy your ability to get into that groove you used to live in back in your better days. Programming requires extended periods of focused attention, and this type of behavior will really kill productivity and in the end, when deadlines are near, launch your stress level to near emotional breakdown levels.DiagnosisThe best way to diagnose infection is to completely disconnect your devices from the internet while working. If you find yourself launching web browsers every minute or so, then you're down with the sickness.TreatmentA few techniques I've found that will help send this ailment into regression are as follows:Segment your day into two to three hour work segments. For example: 9:00-11:00, 1:00-3:00, 3:30-5:00.Define a few small one to two hour tasks you want to accomplish in your day. Assign each of those tasks to one of the short work segments.If possible, turn off the internet and any other distractions during these work segments (at least until you regain control of your browsing habits) - this includes instant messaging and email. You can check your email and waste time surfing in the hours between work segments.Reward yourself on productive days with a beer or whatever butters your muffins.

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• GNOME session not starting after filesystem corruption

  - by user3215

  I'm running Ubuntu 9.10 desktop edition. Suddenly today /home became corrupted and I was prompted to run fsck manually. I ran fsck -y /home and rebooted the system. The system booted but I got no GUI interface (GNOME session) but a black screen with a user prompt instead. Any tricks here to start my system normally? Any help is greatly appreciated. EDIT:1 The error were similar to the the following(may be with some mistakes as I had to type it manually): machine1 login: root password: at login Sun Jan 16 15:30:46 IST 2011 on tty1 EXT3-fs error (devie sda1): ext3_lookup :deleted inode referenced aborting journal on device sda1 Remounting filesystem read-only root@machine1:~# startx ktemp: failed to create file via template `/tmp/serverauth.xxxxxxxxxxx: Read-only file /usr/bin/startx: line 157: cannot create temp file for here-document: Read-only file xauth: error in locking authority file /root/.Xauthority /usr/bin/startx: line 173: cannnot create temp file for here-document: Read-only file xauth: error in locking authority file /root/.Xauthority /usr/bin/startx: line 173: cannnot create temp file for here-document: Read-only file X: cannot stat /tmp/.x11-unix (No such file or directory), aborting giving up. xinit: No such file or directory (errno 2): unable to connect to xserver xinit: No such process (errno 3): Server error xauth: error in locking authority file /root/.Xauthority

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• How to document requirements for an API systematically?

  - by Heinrich

  I am currently working on a project, where I have to analyze the requirements of two given IT systems, that use cloud computing, for a Cloud API. In other words, I have to analyze what requirements these systems have for a Cloud API, such that they would be able to switch it, while being able to accomplish their current goals. Let me give you an example for some informal requirements of Project A: When starting virtual machines in the cloud through the API, it must be possible to specify the memory size, CPU type, operating system and a SSH key for the root user. It must be possible to monitor the inbound and outbound network traffic per hour per virtual machine. The API must support the assignment of public IPs to a virtual machine and the retrieval of the public IPs. ... In a later stage of the project I will analyze some Cloud Computing standards that standardize cloud APIs to find out where possible shortcomings in the current standards are. A finding could and will probably be, that a certain standard does not support monitoring resource usage and thus is not currently usable. I am currently trying to find a way to systematically write down and classify my requirements. I feel that the way I currently have them written down (like the three points above) is too informal. I have read in a couple of requirements enineering and software architecture books, but they all focus too much on details and implementation. I do really only care about the functionalities provided through the API/interface and I don't think UML diagrams etc. are the right choice for me. I think currently the requirements that I collected can be described as user stories, but is that already enough for a sophisticated requirements analysis? Probably I should go "one level deeper" ... Any advice/learning resources for me?

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• Oracle Fusion Applications Design Patterns Now Available For Developers

  - by ultan o'broin

  The Oracle Fusion Applications user experience design patterns are published! These new, reusable usability solutions and best-practices, which will join the Oracle dashboard patterns and guidelines that are already available online, are used by Oracle to artfully bring to life a new standard in the user experience, or UX, of enterprise applications. Now, the Oracle applications development community can benefit from the science behind the Oracle Fusion Applications user experience, too. The design patterns are based on Oracle ADF components and easily implemented in Oracle JDeveloper. These Oracle Fusion Applications UX Design Patterns, or blueprints, enable Oracle applications developers and system implementers everywhere to leverage professional usability insight when: tailoring an Oracle Fusion application, creating coexistence solutions that existing users will be delighted with, thus enabling graceful user transitions to Oracle Fusion Applications down the road, or designing exciting, new, highly usable applications in the cloud or on-premise. Based on the Oracle Application Development Framework (ADF) components, the Oracle Fusion Applications patterns and guidelines are proven with real users and in the Applications UX usability labs, so you can get right to work coding productivity-enhancing designs that provide an advantage for your entire business. What’s the best way to get started? We’ve made that easy, too. The Design Filter Tool (DeFT) selects the best pattern for your user type and task. Simply adapt your selection for your own task flow and content, and you’re on your way to a really great applications user experience. More Oracle applications design patterns and training are coming your way in the future. To provide feedback on the sets that are currently available, let me know in the comments!.

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• What is logical cohesion, and why is it bad or undesirable?

  - by Matt Fenwick

  From the c2wiki page on coupling & cohesion: Cohesion (interdependency within module) strength/level names : (from worse to better, high cohesion is good) Coincidental Cohesion : (Worst) Module elements are unrelated Logical Cohesion : Elements perform similar activities as selected from outside module, i.e. by a flag that selects operation to perform (see also CommandObject). i.e. body of function is one huge if-else/switch on operation flag Temporal Cohesion : operations related only by general time performed (i.e. initialization() or FatalErrorShutdown?()) Procedural Cohesion : Elements involved in different but sequential activities, each on different data (usually could be trivially split into multiple modules along linear sequence boundaries) Communicational Cohesion : unrelated operations except need same data or input Sequential Cohesion : operations on same data in significant order; output from one function is input to next (pipeline) Informational Cohesion: a module performs a number of actions, each with its own entry point, with independent code for each action, all performed on the same data structure. Essentially an implementation of an abstract data type. i.e. define structure of sales_region_table and its operators: init_table(), update_table(), print_table() Functional Cohesion : all elements contribute to a single, well-defined task, i.e. a function that performs exactly one operation get_engine_temperature(), add_sales_tax() (emphasis mine). I don't fully understand the definition of logical cohesion. My questions are: what is logical cohesion? Why does it get such a bad rap (2nd worst kind of cohesion)?

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