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• How to plan/manage multi-platform (mobile) products?

  - by PhD

  Say I've to develop an app that runs on iOS, Android and Windows 8 Mobile. Now all three platforms are technically in different program languages. The only 'reuse' that I can see is that of the boxes-and-lines drawings (UML :) charts and nothing else. So how do companies/programmers manage the variation of the same product across different platforms especially since the implementation languages differ? It's 'easier' in the desktop world IMO given the plethora of languages and cross-platform libraries to make your life easier. Not so in the mobile world. More so, product line management principles don't seem to be all that applicable - what is same and variant doesn't really matter - the application is the same (conceptually) and the implementation is variant. Some difficulties that come to mind: Bug Fixing: Applications maybe designed in a similar manner but the bug identification and fixing would be radically different. A bug on iOS may/may-not be existent for that on Android. Or a bug fix approach on one platform may not be the same on another (unless it's a semantic bug like a!=b instead of a==b which would require the same 'approach' to fixing in essence Enhancements: Making a change on one platform would be radically different than on another Code-Design Divergence: They way the code is written/organized, the class structures etc., could be very different given the different implementation environments - leading to further reuse of the (above) UML models. There are of course many others - just keeping the development in sync and making sure all applications are up to the same version with the same set of features etc. Seems the effort is 3x that of a single application. So how exactly does one manage this nightmarish situation? Some thoughts: Split application to client/server to minimize the effect to client side only (not always doable) Use frameworks like Unity-3D that could take care of the cross-platform problem (mostly applicable to games and probably not to other applications etc.) Any other ways of managing a platform line? What are some proven approaches to managing/taming the effects?

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• Game crash/Screen freeze recovery (without shell or reboot)

  - by Asavar Tzeth

  I am an old Windows PC gamer, now converted into Ubuntu (Linux) lover. I am even going so far as to attempt to replace all my games in a Windows dual-boot with Wine and it is going well. However... Even if Linux is less prone to crashing, games, especially the windows ones (but also a few native) can crash. My problem is when this is in full screen and the computer becomes non-responsive. In Windows you can solve this with ctrl+alt+delete, but Ubuntu lacks this feature and my only choice is a reboot. Is there any Ubuntu version of this feature? Of course excepting the ctrl+alt+F1, find and kill process method. It is fine if you know how to do it, but too slow and difficult for the typical gamer. I believe strongly in Ubuntu as the future gaming platform in one form or another. If this feature does not exist, then the Ubuntu team should address this as fast as possible, since it is critical for all old Windows gamers. Thank you for your time. Asavar Tzeth (Alias)

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• How can I fix my xvinfo?

  - by YumYumYum

  How can i fix my X server/driver? $ xvinfo X-Video Extension version 2.2 screen #0 no adaptors present Additional info: $ uname -a Linux desktop 2.6.32-33-generic #70-Ubuntu SMP Thu Jul 7 21:13:52 UTC 2011 x86_64 GNU/Linux $ lspci 00:00.0 Host bridge: Intel Corporation Device 0100 (rev 09) 00:02.0 VGA compatible controller: Intel Corporation Sandy Bridge Integrated Graphics Controller (rev 09) 00:16.0 Communication controller: Intel Corporation Cougar Point HECI Controller #1 (rev 04) 00:19.0 Ethernet controller: Intel Corporation Device 1503 (rev 05) 00:1a.0 USB Controller: Intel Corporation Cougar Point USB Enhanced Host Controller #2 (rev 05) 00:1b.0 Audio device: Intel Corporation Cougar Point High Definition Audio Controller (rev 05) 00:1c.0 PCI bridge: Intel Corporation Cougar Point PCI Express Root Port 1 (rev b5) 00:1c.1 PCI bridge: Intel Corporation Cougar Point PCI Express Root Port 2 (rev b5) 00:1c.3 PCI bridge: Intel Corporation Cougar Point PCI Express Root Port 4 (rev b5) 00:1d.0 USB Controller: Intel Corporation Cougar Point USB Enhanced Host Controller #1 (rev 05) 00:1f.0 ISA bridge: Intel Corporation Device 1c4a (rev 05) 00:1f.2 SATA controller: Intel Corporation Cougar Point 6 port SATA AHCI Controller (rev 05) 00:1f.3 SMBus: Intel Corporation Cougar Point SMBus Controller (rev 05) 01:00.0 PCI bridge: Integrated Technology Express, Inc. Device 8892 (rev 10) 04:00.0 USB Controller: NEC Corporation Device 0194 (rev 04) Follow up: It seems in 64-bit its a mess doing existing approach. Therefore, after upgrading to 12.04 64-bit this problems in same hardware is resolved (of-course, i have now other drivers problem)

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• Exit stage right...

  - by Peter Korn

  I joined Sun Microsystems in December of 1996, not quite 17 years ago. Over the course of those years, it has been my great pleasure and honor to work with a many talented folks, on a many incredible projects - first at Sun, and then at Oracle. In those nearly 17 years, we made quite a few platforms and products accessible - including Java, GNOME, Solaris, and Linux. We pioneered many of the accessibility techniques that are now used throughout the industry, including accessibility API techniques which first appeared in the Java and GNOME accessibility APIs; and screen access techniques like the API-based switch access of the GNOME Onscreen Keyboard. Our work was recognized as groundbreaking by many in the industry, both through awards for the innovations we had delivered (such as those we received from the American Foundation for the Blind), and awards of money to develop new innovations (the two European Commission accessibility grants we received). Our knowledge and expertise contributed to the first Section 508 accessibility standard, and provided significantly to the upcoming refresh of that standard, to the European Mandate 376 accessibility standard, and to a number of web accessibility standards. After 17 years of helping Sun and Oracle accomplish great things, it is time to start a new chapter... Today is my last day at Oracle. It is not, however, my last day in the field of accessibility. Next week I will begin working with another group of great people, and I am very much looking forward to the great things I will help contribute to in the future. Starting tomorrow, please follow me on my new, still under constriction, Wordpress blog: http://peterkorn.wordpress.com/.

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• Oracle OpenWorld 2012

  - by Maria Colgan

  I can't believe it's time for OpenWorld again! Oracle OpenWorld is the largest gathering of Oracle customers, partners, developers, and technology enthusiasts. This year it will take place between September 30th and October 4th in San Francisco. Of course, the Optimizer development group will be there and you will have multiple opportunities to meet the team, in one of our technical sessions, or at the Oracle Database demogrounds. This year the Optimizer team has 2 technical sessions, as well as a booth in the Oracle Database demogrounds. Tuesday, October 2nd at 1:15pm Oracle Optimizer: Harnessing the Power of Optimizer Hints Session CON8455 at Moscone South - room 103 In this session we will discuss in detail how optimizer hints are interpreted, when they should be used, and why they sometimes appear to be ignored. Thursday, October 4th at 12:45pm Oracle Optimizer: An Insider’s View of How the Optimizer Works Session CON8457 at Moscone South - room 104This session explains how the latest version of the optimizer works and the best ways you can influence its decisions to ensure you get optimal execution every time. It will also include a full history of the Cost Based Optimizer, so make sure you stick around for this one! If you have burning Optimizer or statistics related questions, or if you just want to pick up an Optimizer bumper sticker, you can stop by the Optimizer demo booth. This year we are located in booth 3157, in the Database area of the demogrounds, in Moscone South. Members of the Optimizer development team will be there Monday through Wednesday from 9:45 am until 6pm. The full Oracle OpenWorld catalog is on-line, or you can browse by speakers by name. So start planning your trip today! +Maria Colgan

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• Rendering a DOM across multiple displays

  - by meetamit

  I'm building a data-driven animation with HTML and javascript to run in a web browser. I would like to display it tiled across three 1080p monitors. This essentially yields a viewport that's 5760px wide and 1080px tall. Pretty large. Does anyone have experience setting up something like this? I have many questions below, but any tip would be appreciated: Is it reasonable to expect a DOM to render into such a large viewport size at close to 60fps? I might choose to use canvas, instead of SVG or HTML, but that would yield a giant canvas. Can a canvas with such high resolution be performant? Of course everything depends on the complexity of the graphics I want to render, but I'm looking to remove that factor from this question, so assume I'm asking about a canvas animation that can run at 60fps at 1920x1080 resolution. Would it run roughly as fast at 3 times the width? Would three.js and WebGL be a more proper approach at that resolution? How do you actually cause Chrome or FF to span 3 monitors at full screen? Do I need a 3rd party solution of any kind? Thanks!

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• Displaying Datamatrix in application error screen

  - by DaveNay

  Quite often we will get a report from a user in the field saying there was an error in our application. Frequently this leads to the typical round of "What was the error?" "I don't know, it was just an error." We of course log these faults to the log files, and we can even enable detailed debug logs, but this involves the end user changing a setting in the configuration file and then finding the correct files and then emailing them to us. As I'm sure you can all imagine, there are plenty of pitfalls and alligators in this methodology. Recently a couple of people have used their cell phone to email me a "screen capture" of the fault, and while this helps, we still have to scrutinize the image to find the exact fault, and if enabled, the stack trace. So this evening, I had the brilliant idea (IMHO) to encode the fault into a Datamatrix barcode image and then encourage users to send me a picture from their cell phone. I can then decode the datamatrix and get a parse-able error message! Our core technology is machine vision, so the decoding of the datamatrix image would be trivial, I just need to find a method of generating the actual image to display in the fault handler. Thoughts?

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• Using ConcurrentQueue for thread-safe Performance Bookkeeping.

  - by Strenium

  Just a small tidbit that's sprung up today. I had to book-keep and emit diagnostics for the average thread performance in a highly-threaded code over a period of last X number of calls and no more. Need of the day: a thread-safe, self-managing stats container. Since .NET 4.0 introduced new thread-safe 'Collections.Concurrent' objects and I've been using them frequently - the one in particular seemed like a good fit for storing each threads' performance data - ConcurrentQueue. But I wanted to store only the most recent X# of calls and since the ConcurrentQueue currently does not support size constraint I had to come up with my own generic version which attempts to restrict usage to numeric types only: unfortunately there is no IArithmetic-like interface which constrains to only numeric types – so the constraints here here aren't as elegant as they could be. (Note the use of the Average() method, of course you can use others as well as make your own).   FIFO FixedSizedConcurrentQueue using System;using System.Collections.Concurrent;using System.Linq; namespace xxxxx.Data.Infrastructure{    [Serializable]    public class FixedSizedConcurrentQueue<T> where T : struct, IConvertible, IComparable<T>    {        private FixedSizedConcurrentQueue() { }         public FixedSizedConcurrentQueue(ConcurrentQueue<T> queue)        {            _queue = queue;        }         ConcurrentQueue<T> _queue = new ConcurrentQueue<T>();         public int Size { get { return _queue.Count; } }        public double Average { get { return _queue.Average(arg => Convert.ToInt32(arg)); } }         public int Limit { get; set; }        public void Enqueue(T obj)        {            _queue.Enqueue(obj);            lock (this)            {                T @out;                while (_queue.Count > Limit) _queue.TryDequeue(out @out);            }        }    } }   The usage case is straight-forward, in this case I’m using a FIFO queue of maximum size of 200 to store doubles to which I simply Enqueue() the calculated rates: Usage var RateQueue = new FixedSizedConcurrentQueue<double>(new ConcurrentQueue<double>()) { Limit = 200 }; /* greater size == longer history */   That’s about it. Happy coding!

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• How to start a Software Company

  - by MeshMan

  I've always been interested in wondering how software companies happen. I find it extremely difficult once you're tied down with car, house, life etc. Funding is always the biggest concern. To make this a bit more specific, I see two types. Those offering a product/service or those offering a consultancy company. One things that bugs me about the product/service kind is that we all know how burning the candle at both ends is extremely exhausting. Coding for 8-10 hours in the day and then code in the evenings on your own stuff, doesn't last long. No matter how passionate you are about your idea, simply put, coding day and night is a recipe for burn out. Is this a defeatist attitude though? Can it be balanced? A consultancy kind isn't as tricky in my honest opinion. I think once you have spent years and years in the industry building up relationships, contacts from contracting or moving around, and of course, being involved in the community, then landing your first project as a consultant I'm sure is easier than the product/service kind. I'd imagine friends then could join you as you take on bigger company projects, like an Agile implementation or TDD training, then off you go gaining bigger things. Could you please specify which company type you're answering if you can't contribute to both. I'd like to hear everyone's experiences or ideas on any level for software company start-ups.

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• Clutter for game GUI

  - by tjameson

  I'm pretty new to game development, having only written a simple 3d game for a class project, but I'd like to get started on a bigger project. I'm writing an MMORPG to run in both the browser (WebGL) and natively (OpenGL ES 2). In choosing a GUI toolkit, I'm trying to find a style that work work natively and would be simple to emulate in WebGL. I am considering using D or Go for writing my game, so interfacing with C++ libraries will be difficult, if not impossible. Of course, the language isn't the end goal here, so if using C++ will save considerable time, I'll bite the bullet and use that. In order to reduce the amount of code I'll have to write for the browser, I'm considering using something simple like Clutter for basic abstractions, which I think will be pretty easy to emulate (layered canvases maybe?). Does anyone have experience using Clutter for a 3d game? Note: I haven't used any game development libraries, and I only have limited experience with GUI libraries. I do have HTML+CSS experience, so maybe librocket is a viable solution?

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• Why is quicksort better than other sorting algorithms in practice?

  - by Raphael

  This is a repost of a question on cs.SE by Janoma. Full credits and spoils to him or cs.SE. In a standard algorithms course we are taught that quicksort is O(n log n) on average and O(n²) in the worst case. At the same time, other sorting algorithms are studied which are O(n log n) in the worst case (like mergesort and heapsort), and even linear time in the best case (like bubblesort) but with some additional needs of memory. After a quick glance at some more running times it is natural to say that quicksort should not be as efficient as others. Also, consider that students learn in basic programming courses that recursion is not really good in general because it could use too much memory, etc. Therefore (and even though this is not a real argument), this gives the idea that quicksort might not be really good because it is a recursive algorithm. Why, then, does quicksort outperform other sorting algorithms in practice? Does it have to do with the structure of real-world data? Does it have to do with the way memory works in computers? I know that some memories are way faster than others, but I don't know if that's the real reason for this counter-intuitive performance (when compared to theoretical estimates).

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• How to Use Vim-Style Keyboard Shortcuts for OS X Tab Navigation

  - by The Geek

  After switching to OS X when I got a new MacBook Air, one of the first things I needed to duplicate was my extremely customized AutoHotkey setup — the most important of which is using the J and K keys to navigate throughout tabbed windows easily. Yeah, I’m a Vim user. I’ve never been a fan of having to use CTRL + TAB to switch from one tab to the next — to start with, you have to move your hands from the home row, and it’s awkward, and why should I have to do that just because somebody decided that keyboard shortcut before tabs became popular? If you think about it, if tabbed browsers were popular back when keyboard shortcuts were being invented, they would have definitely reserved some of the good shortcuts for switching tabs. On Windows, I’ve always used an AutoHotkey script to make things the way I wanted it:  ALT + J and ALT + K for selecting previous and next tabs. Once you get used to it, it’s extremely awesome, and so much faster than using CTRL + TAB. Of course, I also hacked CTRL + T and CTRL + W into ALT + T and ALT + W so I could open new tabs and close them without moving my hands from the home row. Over on OS X, it turns out that it’s incredibly simple and easy to use CMD + J and CMD + K for next/previous tab navigation, and it works in most applications that support tabs, like Terminal, Safari, or Google Chrome.    

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• Silverlight Developer needs ASP.NET MVC Training [on hold]

  - by Peet Brits

  With Silverlight on the way out, our company wants to embrace HTML5 and related technologies. Background: Our Silverlight project did everything from generating its own models (or data contracts), sending it over WCF, tracking changes, with a whole deal of back-end code to make the ride smoother, but often also cluttered and more complex. Most of the original developers for this project are gone, and we want to embrace something new for future projects. Having done this very useful MVC Jump Start course at Microsoft Virtual Academy, we are all fired up for the next project. The problem is that we have very little in-depth knowledge of all the many different components. The most important hereof is probably Entity Framework, and (for later) Web API. I suppose the best place to start is at the Microsoft ASP.NET websites. Are there any other suggestions for learning from more experienced developers? I am a senior developer, but my knowledge of ASP.NET MVC (and related) is very limited. PS: We have a project deadline at the end of this month.

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• Now Released: "Oracle WebLogic Server 12c: Administration I" Certification Exam (1Z0-133)

  - by Brandye Barrington

  Oracle Certification is pleased to announce the production release of the Oracle WebLogic Server 12c: Administration I Certification Exam (1Z0-133). Passing this exam results in the "Oracle Certified Associate (OCA) - Oracle WebLogic Server 12c Administrator" certification. Oracle WebLogic Server sets the industry standard for Java application servers, and the "Oracle Certified Associate (OCA) - Oracle WebLogic Server 12c Administrator" certification sets the standard for WLS administrators. Obtaining this certification proves that you have the skills to set up server environments, tune performance and troubleshoot with confidence and raises the bar for your peers.  While training is not required for certification, the Oracle WebLogic Server 12c: Administration I course from Oracle University, can expedite you towards your certification - helping you gain the skills and knowledge to increase the performance and scalability of your organization’s applications and services with the #1 application server. Becoming certified gives you a competitive edge through proven expertise. The Oracle WebLogic Server 12c: Administration I exam (1Z0-133) is now available in production. Get all preparation details, including exam objectives, number of questions, time allotments, and pricing on the Oracle Certification website. Register now for exam 1Z0-133 at www.pearsonvue.com/oracle. QUICK LINKS: Certification Track: Oracle Certified Associate (OCA) - Oracle WebLogic Server 12c Administrator Certification Exam: Oracle WebLogic Server 12c: Administration I Certification Exam (1Z0-133) Recommended Training: Oracle WebLogic Server 12c: Administration I Register Now: Pearson VUE

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• FREE three days of online SharePoint 2010 development training for UK software houses Feb 9th to 11th

  - by Eric Nelson

  I have been working to get a SharePoint development course delivered online in February and March – online means lots of opportunities to ask questions. The first dates are now in place. The training is being delivered as a benefit for companies signed up to Microsoft Platform Ready. It is intended for UK based companies who develop software products* Agenda: Day 1 (Live Meeting 3 hours) 1:30 - 4:30 •         Getting Started with SharePoint: Understand why and how to start developing for SharePoint 2010 •         SharePoint 2010 Developer Roadmap:  Explore the new capabilities and features •         UI Enhancements: How to take advantage of the many UI enhancements including the fluent UI ribbon and  extensible dialog system. Day 2 (Live Meeting 3 hours) 1:30 - 4:30 •         Visual Studio 2010 Tools for SharePoint 2010: Overview of the project and item templates and a walkthrough of the designers •         Sandboxed Solutions: The new deployment model can help mitigate the risk of deploying custom code   •         LINQ to SharePoint:  SharePoint now fully supports LINQ for querying lists Day 3 (Live Meeting 3 hours) 1:30 - 4:30 •         Client Object Model: The Client OM can be accessed via web services, via a client (JavaScript) API, and via REST •         Accessing External Data: Business Connectivity Services (BCS) enables integration with back end systems •         Workflow: A powerful mechanism to create functionality using Windows Workflow Foundation Register for FREE (and tell your colleagues – we have a pretty decent capacity) To take advantage of this you need to: Sign your company up to Microsoft Platform Ready and record your SharePoint interest against one of your companies products Read about Microsoft Platform Ready Navigate to the “Get Technical Benefits” tab for SharePoint and click on Register Today You will then ultimately get an email with details of the Live Meeting to join on the 9th. But you should also favourite the team blog for any last minute details * Such companies are often referred to as an Independent Software Vendors. My team is focused on companies that create products used by many other companies or individuals. That could be a packaged product you can buy "off the shelf" or a Web Site offering a service - the definition is actually pretty wide these days :-) What it does not include is a company building software which will only be used by its own people.

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• POLL: How do you build your interfaces in xcode for iphone/coco-touch applications?

  - by LolaRun

  Hi all, It's been 2 months i'm using xcode and building iphone apps, and i'm finding it really hard to grasp the good design for the applications. I always face problems like you can't put your tabbarcontroller in another custom viewcontroller sort of a thing? or other problems... That 'sometimes' - of course - would work if you did the creation of the views/viewcontrollers programmatically. so I don't know if i should start writing the creation of my objects or use interface builder. This is why i'm asking this poll question, to see what's the most accepted way among other developers. I'm not going to answer my question, so the votes would not increase my reputation and risk my poll being closed soon. I prefer that the first two readers of this question should answer by 'using IB' and the second one 'programmatically' and the rest would vote up or down for these two answers. And don't vote my question either, i just need to know, and maybe someone else wants to know. so the longer this question lives the better. and gaining nothing from it concerning reputation would help that cause. thank you all for your cooperation. and go ahead and answer Peace

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• Why is Ubuntu unmounting my primary hard drive?

  - by Twisol

  I'm running Ubuntu 10.10 on my laptop (an Asus G73j), dual-booting Windows 7 if that matters. After using the computer for couple of hours or so, I get a popup complaining that a file was unmounted, then my GNOME desktop panels disappear. I can't save any unsaved work (the file browser shows "Filesystem" as totally empty), and other programs break in odd ways (like Chrome can't browse to any new pages, but keeps current ones going... at least I still have Pandora to listen to when this happens!). I've tried looking in the system logs to no avail; I'm assuming that it can't write any errors to the logs because, of course, the logs are on the primary hard drives. This started happening maybe a few days ago. Yesterday I upgraded from 10.4, but I believe it was happening before then. Any advice for figuring this out? EDIT: It just happened again, and I heard a small little clicky sound from the hard drive about five seconds before things went south. I'm thinking I should start backing up ASAP. In response to a comment, here's the dmesg output: http://askubuntu.pastebin.com/uYGshBay Also, the SMART status says the disk has a few bad sectors, and the detailed data says there are 14. It says it passed the self-assessment though. Lastly, this doesn't seem to be happening when I'm on Windows. I recently re-enabled ureadahead (which I disabled ages ago because it was causing Ubuntu to hang at the startup logo), could that be the source of the problem? I've disabled it again to see.

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• How far should one take e-mail address validation?

  - by Mike Tomasello

  I'm wondering how far people should take the validation of e-mail address. My field is primarily web-development, but this applies anywhere. I've seen a few approaches: simply checking if there is an "@" present, which is dead simply but of course not that reliable. a more complex regex test for standard e-mail formats a full regex against RFC 2822 - the problem with this is that often an e-mail address might be valid but it is probably not what the user meant DNS validation SMTP validation As many people might know (but many don't), e-mail addresses can have a lot of strange variation that most people don't usually consider (see RFC 2822 3.4.1), but you have to think about the goals of your validation: are you simply trying to ensure that an e-mail address can be sent to an address, or that it is what the user probably meant to put in (which is unlikely in a lot of the more obscure cases of otherwise 'valid' addresses). An option I've considered is simply giving a warning with a more esoteric address but still allowing the request to go through, but this does add more complexity to a form and most users are likely to be confused. While DNS validation / SMTP validation seem like no-brainers, I foresee problems where the DNS server/SMTP server is temporarily down and a user is unable to register somewhere, or the user's SMTP server doesn't support the required features. How might some experienced developers out here handle this? Are there any other approaches than the ones I've listed? Edit: I completely forgot the most obvious of all, sending a confirmation e-mail! Thanks to answerers for pointing that one out. Yes, this one is pretty foolproof, but it does require extra hassle on the part of everyone involved. The user has to fetch some e-mail, and the developer needs to remember user data before they're even confirmed as valid.

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• If I send an IPA over TestFlight, can it be used to deploy to the app store?

  - by Reid Belton

  I am currently working for a small startup. I was previously under contract, now I am working for equity (no pay). The thing is, there is not yet a signed agreement in place as the details are being worked out. I may finish development before the contract is ready. I'm not currently under any contract or agreement, so the other party doesn't have any legal claim (that I know of) to the code I'm writing now, other than NDA (which just precludes me from cutting him out and releasing on my own). He already has the old code that I wrote under contract. I've made it clear to the other party that I won't submit the app or turn over the code until there's something signed to protect my interests. I've stopped pushing commits to the company repo (I'm now the only developer actively working on the project). However, I would still like to send builds over TestFlight for feedback and testing purposes. The other party has access to the developer portal and iTunes Connect for code signing, etc. Things are amicable and I don't foresee getting burnt on this, but I'm not going to put myself in that position. My concern is that if I send a finished build via TestFlight, it could be extracted and submitted to the app store without my participation. They wouldn't have the source for future maintenance and updates, of course, but it could be reverse-engineered by another developer later working from the old code base. Is this technically feasible at all? If so, is there a way I can send builds for testing while protecting my interests?

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• Using a random string to authenticate HMAC?

  - by mrwooster

  I am designing a simple webservice and want to use HMAC for authentication to the service. For the purpose of this question we have: a web service at example.com a secret key shared between a user and the server [K] a consumer ID which is known to the user and the server (but is not necessarily secret) [D] a message which we wish to send to the server [M] The standard HMAC implementation would involve using the secret key [K] and the message [M] to create the hash [H], but I am running into issues with this. The message [M] can be quite long and tends to be read from a file. I have found its very difficult to produce a correct hash consistently across multiple operating systems and programming languages because of hidden characters which make it into various file formats. This is of course bad implementation on the client side (100%), but I would like this webservice to be easily accessible and not have trouble with different file formats. I was thinking of an alternative, which would allow the use a short (5-10 char) random string [R] rather than the message for autentication, e.g. H = HMAC(K,R) The user then passes the random string to the server and the server checks the HMAC server side (using random string + shared secret). As far as I can see, this produces the following issues: There is no message integrity - this is ok message integrity is not important for this service A user could re-use the hash with a different message - I can see 2 ways around this Combine the random string with a timestamp so the hash is only valid for a set period of time Only allow each random string to be used once Since the client is in control of the random string, it is easier to look for collisions I should point out that the principle reason for authentication is to implement rate limiting on the API service. There is zero need for message integrity, and its not a big deal if someone can forge a single request (but it is if they can forge a very large number very quickly). I know that the correct answer is to make sure the message [M] is the same on all platforms/languages before hashing it. But, taking that out of the equation, is the above proposal an acceptable 2nd best?

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• Estimate of Hits / Visits / Uniques in order to fall within a given Alexa Tier?

  - by Alex C

  Hi there! I was wondering if anyone could offer up rough estimates that could tell me how many hits a day move you into a given Alexa rank ? Top 5,000 Top 10,000 Top 50,000 Top 100,000 Top 500,000 Top 1,000,000 I know this is incredibly subjective and thus the broad brush strokes with the number ranges... BUT I've got a site currently ranked just over 1.2M worldwide and over 500k in the USA (http://www.alexa.com/siteinfo/fstr.net) Pretty cool for something hand-built on weekends (pat self on back) I was applying to an ad-platform and was told that their program doesn't accept webmasters who have an Alexa rank of greater than 100,000. (Time to take back that pat on the back I guess). I know that my hits in the last 30 days are somewhere on the order of 15,000 uniques and 20,000 pageviews. So I'm wondering how much harder do I have to work to achieve my next "goals"? I'd like to break into the top million, then re-evaluate from there. It'd be nice to know what those targets translate into (very roughly of course). I imagine that alexa ranks and tiers become very much exponential as you move up the ranks, but even hearing annecdotal evidence from other webmasters would be really useful to me. (ie: I have a site that is ranked X and it got Y hits in the last 30 days) Thanks :) - Alex

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• Amazon EC2 vs Dedicated server at Hetzner, what's the use for EC2?

  - by C-Blu

  After searching the web I still can't find the reason to use EC2. What's the point to scale EC2? If you expect a huge burst in traffic, they say. OK, but what if you already have a couple of sites with good traffic, and for example medium reserved EC2 instance is not enough. You are paying $36.60(medium reserved for 1year) in EU(Ireland) + traffic + optional expenses for databases and S3 if you use them. Of course as some point when you are under $56.6-$66.1 you can optimize your hosting costs with Amazon EC2. But when you get at some point if purchase EX4 server from Hetzner, it will surpass your perfomance needs for a long time, before you get a massive traffic. (I am wrong?) CPU: i7-2600 Quadcore (3.4-3.8 Ghz) RAM: 16 GB HDD: 2x3 TB SATA (6 Gbit/s) - I think that disc performance of a dedicated is better then of Amazon EBS Traffic: 10 TiB in month included. This is what you get from Hetzner for $56(- 19% VAT) or $66 for EU residents. Please, tell me what's the reason to use Amazon? Which load won't a server from Hetzner take, but Amazon Auto Scaling will? The maintenance of dedicated vs EC2 is still the same? Or hardware failure at Amazon, won't ruin your EBS storage? I'm still not at the level when I need expensive hosting, but want to know beforehand, just to be sure if Amazon infrastructure is better then pure performance of Hetzner's hardware.

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• How to know how much detailed requirements should be?

  - by user1620696

  This doubt has to do with the requirements gathering phase of each iteration in one project based on agile methodologies. It arose because of the following situation: suppose I meet with my customer to gather the requirements and he says something like: "I need to be able to add, edit, remove and see details of my employees". That's fine, but how should we register this requirement? Should we simply write something like "the system must allow the user to manage employees", or should we be more specific writing for points The system must allow the user to add employees; The system must allow the user to see details of employees; The system must allow the user to edit employees; The system must allow the user to delete employees; Of course, this is just an example of a situation I was in doubt. The main point here is: how to know how much detailed I must be, and how to know what I should register? Are there strategies for dealing with these things? Thanks very much in advance!

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• Stop Time Sync Between Host and Guest - VirtualBox

  - by KoopaTroopa

  So I've been googling and I've tried the following commands. I want to stop the virtual machine from having the correct time and just to stick with what time it last recorded. The host operating system is Ubuntu 12.04 and the guest is Windows XP. I've turned time syncing off in XP so it won't do that when I connect to the Internet. However it does appear to take the time from ubuntu and set it as it's own. VBoxManage setextradata XP11 “VBoxInternal/TM/WarpDrivePercentage” 200 vboxmanage setextradata XP11 "VBoxInternal/Devices/VMMDev/0/Config/GetHostTimeDisabled" "1" Both commands haven't work as the time is always set to the exact same as Ubuntu's. I've located the extradata entry in the virtualbox XML file. It states both changes that the commands above are set to make. But of course it still hasn't stopped updating the time. <ExtraData> <ExtraDataItem name="GUI/LastGuestSizeHint" value="1152,864"/> <ExtraDataItem name="GUI/LastNormalWindowPosition" value="74,52,1152,911"/> <ExtraDataItem name="VBoxInternal/Devices/VMMDev/0/Config/GetHostTimeDisabled" value="1"/> <ExtraDataItem name="&#x201C;VBoxInternal/TM/WarpDrivePercentage&#x201D;" value="200"/> </ExtraData>

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• Rotate a vector

  - by marc wellman

  I want my first-person camera to smoothly change its viewing direction from direction d1 to direction d2. The latter direction is indicated by a target position t2. So far I have implemented a rotation that works fine but the speed of the rotation slows down the closer the current direction gets to the desired one. This is what I want to avoid. Here are the two very simple methods I have written so far: // this method initiates the direction change and sets the parameter public void LookAt(Vector3 target) { _desiredDirection = target - _cameraPosition; _desiredDirection.Normalize(); _rotation = new Matrix(); _rotationAxis = Vector3.Cross(Direction, _desiredDirection); _isLooking = true; } // this method gets execute by the Update()-method if _isLooking flag is up. private void _lookingAt() { dist = Vector3.Distance(Direction, _desiredDirection); // check whether the current direction has reached the desired one. if (dist >= 0.00001f) { _rotationAxis = Vector3.Cross(Direction, _desiredDirection); _rotation = Matrix.CreateFromAxisAngle(_rotationAxis, MathHelper.ToRadians(1)); Direction = Vector3.TransformNormal(Direction, _rotation); } else { _onDirectionReached(); _isLooking = false; } } Again, rotation works fine; camera reaches its desired direction. But the speed is not equal over the course of movement - it slows down. How to achieve a rotation with constant speed ?

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