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• Packing up files on my machine, sending it to a server, and unpacking it

  - by MxyL

  I am implementing a feature in my application that sends all files in a specified folder to a server. I have the basic FTP transaction set up using Apache Commons FTPClient: it sets up a connection and transfers a file from one place to another. So I can simply loop over the directory and use this connection to transfer all the files. However, this could be better. Rather than transferring each file one by one, it makes more sense to pack it up in a compressed archive and then send the whole file at once. Saves time and bandwidth, since these are just text files so they compress nicely. So I would like to add automatic archive packing and unpacking. This is the workflow I have planned out, using zip compression: Zip all files in the folder Send the file over Unzip the files at its destination 1 and 2 are easy since the files are on the local machine, but I'm not sure how to accomplish the last step, when the files are now on a remote server. What are my options? I have control over what I can put and run on the server. Perhaps it is not necessary to do the packing/unpacking myself?

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• A simple example of movement prediction

  - by Daniel

  I've seen lots of examples of theory about the reason for client-side prediction, but I'm having a hard time converting it into code. I was wondering if someone knows of some specific examples that share some of the code, or can share their knowledge to shed some light into my situation. I'm trying to run some tests to get a the movement going (smoothly) between multiple clients. I'm using mouse input to initiate movement. I'm using AS3 and C# on a local Player.IO server. Right now I'm trying to get the Client side working, as I'm only forwarding position info with the client. I have 2 timers, one is an onEnterFrame and the other is a 100ms Timer, and one on mouseClick listener. When I click anywhere with a mouse, I update my player class to give it a destination point On every enterFrame Event for the player, it moves towards the destination point At every 100ms it sends a message to the server with the position of where it should be in a 100ms. The distance traveled is calculated by taking the distance (in Pixels) that the player can travel in one second, and dividing it by the framerate for the onEnterFrame handler, and by the update frequency (1/0.100s) for the server update. For the other Players, the location is interpolated and animated on every frame based on the new location. Is this the right way of doing it?

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• Should I use OpenGL or DX11 for my game?

  - by Sundareswaran Senthilvel

  I'm planning to write a game from scratch (a BIG Game, for commercial purpose). I'm aware that there are certain compute libraries like OpenCL, AMD APP SDK, C++ AMP as well as DirectCompute - both from MS (NOT interested in CUDA) are available in the market. I'm planning to write the game from the scratch, which includes the following engines... Physics Engine AI Engine Main Game Engine (... and if anything is missed). I'm aware that, there are some free physics engine libraries in the market. Not sure about free AI engine libraries. I'm bit confused in choosing between the OpenCL, AMD APP SDK, and C++ AMP libraries (as already mentioned i'm NOT interested in CUDA). I want my game to be published in Windows/Android/Mac OSX. It means it should be a cross-platform game. I will be having "one source code" that i'll compile for various platforms like Windows/Android/Mac OSX, and any others if i missed. Note: Since I'm NOT a Java guy, kindly do NOT suggest me the Java Language. For Graphics language should i use OpenGL or DirectX 11? I have heard that OpenGL runs on a single core, and not sure of DirectX 11. Between OpenGL and DirectX which one should i follow? or else, are there any other graphics language that i need to start with? I want to make use of the parallelism in GPU as well as CPU.

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• Hosting and domain registrations for multiple clients

  - by letseatfood

  I am finally getting regular work desiging, developing, and deploying websites for small businesses and individuals. So far the websites utilize single-user content management systems, so the websites create, as far as I know, minimal load on the shared servers. I have always required that each of my clients purchase annual shared hosting at Dreamhost. For domain registration, I ask that they register with Dreamhost, but some already have a registered domain elsewhere and this is fine with me. I do this so the billing issues are the client's responsibility, not mine. My question is: Since I can register unlimited domains and connect them to my one shared hosting account at Dreamhost, should I not be requiring clients to individually pay for shared hosting and a domain? Should I actually be paying for one hosting account and then hosting all of my client's websites on that account? As I said before, I currently have each client buy their own hosting, because I feel that, for example, if there is high traffic to their site, there would be less a chance of the site going down than if their site was hosted with many others on one account. I am famous for being long-winded, please let me know if I can clarify at all. Thanks!

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• Is this a ridiculous way to structure a DB schema, or am I completely missing something?

  - by Jim

  I have done a fair bit of work with relational databases, and think I understand the basic concepts of good schema design pretty well. I recently was tasked with taking over a project where the DB was designed by a highly-paid consultant. Please let me know if my gut intinct - "WTF??!?" - is warranted, or is this guy such a genius that he's operating out of my realm? DB in question is an in-house app used to enter requests from employees. Just looking at a small section of it, you have information on the users, and information on the request being made. I would design this like so: User table: UserID (primary Key, indexed, no dupes) FirstName LastName Department Request table RequestID (primary Key, indexed, no dupes) <...> various data fields containing request details UserID -- foreign key associated with User table Simple, right? Consultant designed it like this (with sample data): UsersTable UserID FirstName LastName 234 John Doe 516 Jane Doe 123 Foo Bar DepartmentsTable DepartmentID Name 1 Sales 2 HR 3 IT UserDepartmentTable UserDepartmentID UserID Department 1 234 2 2 516 2 3 123 1 RequestTable RequestID UserID <...> 1 516 blah 2 516 blah 3 234 blah The entire database is constructed like this, with every piece of data encapsulated in its own table, with numeric IDs linking everything together. Apparently the consultant had read about OLAP and wanted the 'speed of integer lookups' He also has a large number of stored procedures to cross reference all of these tables. Is this valid design for a small to mid-sized SQL DB? Thanks for comments/answers...

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• I am not the most logically-organized person. Do I have any chance at being a good 'low-level' programmer?

  - by user217902

  Background: I am entering college next year. I really enjoy making stuff and solving logical problems, so I'm thinking of majoring in compsci and working in software development. I hope to have the kind of job where I can work with implementing / improving algorithms and data structures on a regular basis.. as opposed to, say, a job that's purely concerned with mashing different libraries together, or 'finding the right APIs for the job'. (Hence the word 'low-level' in the title. No, I don't wish to write assembly all day.) Thing is, I've never been the most logically-sharp person. Thus far I have only worked on hobby projects, but I find that I make the silliest of errors ever so often, and it can take me ages to find it. Like anywhere between three hours to a day to locate a simple segfault, off-by-one error, or other logical mistake. (Of course, I do other things in the meantime, like browsing SO, reddit, and the like..) It's not like I'm 'new' to programming either; I first tried C++ maybe five years ago. My question is: is this normal? Should a programmer with any talent solve it in less time? Having read Spolsky's Smart and gets things done, where he talks about the large variance in programming speed, am I near the bottom of the curve, and therefore destined to work in companies that cannot afford to hire quality programmers? I'd like to think that conceptually I'm okay -- I can grasp algorithms and concepts pretty well, I do fine in math and science, although I probably drop signs in my equations more often than the next guy. Still, grokking concepts makes me happy, and is the reason why I want to work with algorithms. I'm hoping to hear from those of you with real-world programming experience. TL;DR: I make many careless mistakes, should I not consider programming as a career?

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• Add an entry for Ubuntu on Windows 8 boot loader

  - by John

  I have installed Ubuntu 12.10 by creating free space in Windows 8 and then using that space to create 3 partitions, one for SWAP, one for GRUB (mounting point is /boot) and one for the actual OS. I did this so the Windows 8 boot loader wouldn't be overwritten in case I ever wanted to remove Ubuntu. I can still boot into Ubuntu if I select the boot loader from the BIOS. I want to add Ubuntu to the Windows 8 boot loader and I've been told to use EasyBCD. The issue with that is it doesn't actually direct Windows to the GRUB file, but rather to something like autogrub0.mri. I have found another programme called Visual BCD which will allow me to actually set the bootloader paths and drives. From here, I don't quite know what to do. I believe I have it set to the correct drive but I don't know if I'm directing to the right file. I think it's /boot/grub/x86_64-efi/grub.efi. I don't know if that's the right file, if I need to remove /boot or if the / need to be \ as that's what Windows uses. Sorry for such a lengthy post, please help!

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• Restoring backup with Deja Dup from external HD

  - by widgg

  So, here's the problem that I have with restoring. First, I backed up like everything. So I had place on the external HD for only one copy. I had to reinstall everything, but I didn't worry because I had a backup. But now, restoring doesn't work and it starts to be annoying. So, I right click "Restore missing files...". Then I have the popup window from Deja Dup asking where is the backup. So, I select the external HD and either put nothing in "folder" or just put ".". Thinking that it should be the base to look for backups. In both cases, after a while scanning, I get: The Volume "Filesystem root" has only 139.7mb disk space remaining. But my partition "/home" has 799.6Gb free. Also, I just want to restore some files, I don't need all of them. On my external HD, there's a file called: duplicity-full.20120514T220834Z.manifest. A text file. In it, I can see that everything is partitions in files of 52mb. So, small files are in one archive while very large files are split in multiple one. But I can see the exact list of file that I have. So, I'm guessing that my backup is intact. What am I doing wrong ? Is possible that it failes, even to list all the files, because I don't have enough space left on my ExtHD ? Why can't duplicity used another location to do that ?

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• Centrally managing 100+ websites without bankrupting a small company

  - by palintropos

  I'm mainly interested in opinions on the trade-offs between having a single central server all the websites connect to as opposed to each website mirroring a subset of the master database with all the products in it. For example, will I run into severe performance issues (or even security issues, or restrictions) making queries to an offsite database? Will we hit scalability issues we can't handle early on from the sheer bandwidth required to maintain this? If we do go with something like a script that keeps smaller databases (each containing a subset of the central master data) in sync, what sorts of issues will we likely encounter there? I would really like the opinions of people far more knowledgeable than I am regarding the pros and cons of both setups and what headaches we are likely to encounter. CLARIFICATION: This should not be viewed as a question about whether we should implement one database vs multiple databases. This question has been answered numerous times. The question is regarding the pros and cons for a deployment like this having the ability to manage all the websites centrally (one server) vs trying to keep them all in sync if they each have their own db (multiple servers). REAL-WORLD EXAMPLE: We are a t-shirt company, and we have individual websites for our different kinds of t-shirts, but we're looking at a central order management integrated with our single shopping cart (which is ColdFusion + MySQL). Now, let's say we have a t-shirt that's on 10 of our websites and we change an image for it. Ideally we would change that in one place and the change would propagate, but how would we set this up?

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• Oracle E-Business Products New Search Helpers for Guided Resolution of Customer Issues

  - by user793044

  Oracle E-Business Proactive Support has created many new guided resolution documents that you may find helpful in resolving issues in your EBS applications.  These new documents are called “Search Helpers” and they guide you through your issue to a solution.  They are meant to be an easy and fast method to finding a relevant, complete solution. Hundreds of notes and service requests were reviewed and the best solutions to these known issues were selected.  For some issues, notes were updated to better clarify the solution.  In other cases, if a note with a solution did not already exist, one was created. You start the process by selecting the scenario you have encountered.  You may have received an error message, or there may be a particular area of the application in which you have encountered an issue.  Based on your selection of the issue, the Search Helper will present one or more additional possible symptoms.  When you have selected from both of these two sections, you are then presented with one or more articles known to have fully solved this issue in the past.  Several EBS products have produced Search Helpers documents.  Take a look at Doc ID 1501724.1 for an index of the current EBS Search Helpers.  Here is an example of a Search Helper from the Receivables Transactions area: After selecting the Functional Area of "Entering / Updating Transactions" a list of Known Symptoms is presented: And, when "Transaction numbers are not in sequence" is selected, a solution link is provided for Document ID 197212.1: How To Setup Gapless Document Sequencing in Receivables. The EBS applications that currently have published Search Helpers are: Advanced Pricing Applications Technology Configurator General Ledger Human Capital Management Inventory Management Order Management Payables Process Manufacturing Purchasing Receivables Shipping Value Chain Planning

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• Best way: restructure an existing Team Foundation Server (TFS) solution

  - by dhh

  In my department we are developing several smaller AddOns for some unified communication server. For versioning and distributed development we use a Team Foundation Server 2012. But: there is only one large TFS solution for all of our applications and libraries: Main Solution Applications App 1 App 2 App 3 Externals Libraries Lib 1 Lib 2 Tools The "Application" path contains all main applications. Those are not depending on each other, but they depend on the Libraries and Externals projects. The "Externals" path contains some external DLLs referenced in our Applications and Libraries. The Libraries path contains commonly used libs (UI templates, Helper classes, etc.). They do not depend on each other and they are referenced in the Libraries and the Tools projects. The Tools path contains some helper programs like setup helpers, update web services, etc. Now, there's some major points why I'd like to change this structure: We can't use server builds. It's uncomfortable to manage TFS scrum management with sprints, impediments, etc. with a solution structure like that. Every developer always has access to all projects in the solution. A complete build lasts too long if one accidentally hits [F6] in Visual Studio... What would you change in this solution? How would you break those projects into smaller Solutions, how should those solutions be structured. My first approach would be, to create one TFS project for each Application, Library and Tool. But how can I ensure that e.g. App 2 always contains the newest version of Lib 1? Do I have to monitor changes on Lib 1 and update App 2 manually as soon as the Lib changes? Or can I somehow force Visual Studio to always use the newest version of an external project somehow?

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• Skip CodedUI Tests, use Selenium for Web Automation

  - by Aligned

  Originally posted on: http://geekswithblogs.net/Aligned/archive/2013/10/31/skip-codedui-tests-use-selenium-for-web-automation.aspxI recently joined a team that was using Agile Methodologies to create a new product. They have a working beta product after 10 or so 2 week sprints and already had UI’s that had changed several times as they went through iterations of their UI. As a result, the QA team was falling behind with automated tests and I was tasked to help them catch up and expand their tests. The project is a website. I heard many complaints about how hard it is to work with CodedUI (writing our own code, not relying on the recorder as we wanted re-usable and more maintainable code) then it took me 4+ hours to fix one issue. It was hard to traverse the key and debugging the objects with breakpoints… I said out loud “there has to be a better way or a framework the uses jQuery to run through the tests.” Plus it seemed really slow (wait… finding the object … wait… start putting in text…). Plus some tests would randomly fail on the test agents (using the test settings and an automated build, they are run on VMs using Microsoft test agents). Enough complaining. Selenium to the rescue (mostly). The lead QA guy decided to try it out and we haven’t turned back. We are now running tests in Chrome and Firefox and they run a lot faster. We had IE running to, but some of the tests were running fine locally, but hanging on the test agents. I’ll add some hints and lessons learned in a later post.

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• How to visualize code?

  - by gablin

  I've mostly only had to read my own code. As such, I've had no need to visualize the code as I already know how each and every class and module communicate with one another. But the few times I've had to read someone else's code - let us now assume we are talking about at least one larger module which contains several internal classes - I've almost always found myself wishing "This would have been so much easier to understand if I could just visualize it!" So what are the common methods or tools for enabling this? Which do you use, and why do you prefer them over the others? I've heard stuff like UML, module and class diagrams, but I imagine there are more. Furthermore, any of these is most likely better than anything I can devise on my own. EDIT: For those who answer with "Use pen and paper and just draw it": This isn't very helpful unless you explain this further. What exactly am I supposed to draw? A box for each class? Should I include the public methods? What about its fields? How should I draw connections that explain how one class uses another? What about modules? What if the language isn't object-oriented but functional or logical, or even just imperative (C, for instance)? What about global variables and functions? Is there an already-standardized way of drawing this, or do I need to think up of a method of my own? You get the drift.

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• How can I get SLI working with 295.40?

  - by Steve

  I've been doing a lot of googling these last few hours and I'm not having much luck. Perhaps I don't know exactly what I am looking for. I just recently installed Ubuntu 12.04LTS x86_64. Looks beautiful! I have two GTX470's in SLI, and I am finally migrating my desktop over given the hopeful gaming support as of late. My laptop has been enjoying multiple distros of Ubuntu for a couple years now. However, new problems come with unexplored territory, here. At first, I only had one working monitor of my two. Over on nvidia-xconfig I fixed that, but the only solution that actually worked was twinview. Just recently I read here that twinview is not compatible with SLI. Sweet. When I try to tell it, oh hey, use a separate XScreen, configure it the way I want it, click save to configuration file, enter my password, then a sudo restart lightdm, it's broken. One screen blacks or whites out (Couldn't tell you the specific conditions for each, I'm dubious at this point,) and I get this huge error dialogue box upon login. Something about incompatible resolutions if I remember right. Though I am sure I set the resolutions for each screen correctly. Anyway, when I try to enable SLI (sudo nvidia-xconfig --sli=On) despite the fact it hates twinview, unity breaks. The sidebar is there, but only one screen works, the mouse is trapped running along the left edge of it, and the background of the sidebar is a solid blue. Anyway, this ended up being entirely too verbose, I'm sorry, but could anyone part some wisdom please? It would be appreciated!

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• What are some good tips for a developer trying to design a scalable MySQL database?

  - by CFL_Jeff

  As the question states, I am a developer, not a DBA. I have experience with designing good ER schemas and am fairly knowledgeable about normalization and good schema design. I have also worked with data warehouses that use dimensional modeling with fact tables and dim tables. However, all of the database-driven applications I've developed at previous jobs have been internal applications on the company's intranet, never receiving "real-world traffic". Furthermore, at previous jobs, I have always had a DBA or someone who knew much more than me about these things. At this new job I just started, I've been asked to develop a public-facing application with a MySQL backend and the data stored by this application is expected to grow very rapidly. Oh, and we don't have a DBA. Well, I guess I am the DBA. ;) As far as designing a database to be scalable, I don't even know where to start. Does anyone have any good tips or know of any good educational materials for a developer who has been sort of shoved into a DBA/database designer role and has been tasked with designing a scalable database to support an application like this? Have any other developers been through this sort of thing? What did you do to quickly become good at this role? I've found some good slides on the subject here but it's hard to glean details from slides. Wish I could've attended that guy's talk. I also found a good blog entry called 5 Ways to Boost MySQL Scalability which had some good information, though some of it was over my head. tl;dr I just want to make sure the database doesn't have to be completely redesigned when it scales up, and I'm looking for tips to get it right the first time. The answer I'm looking for is a "list of things every developer should know about making a scalable MySQL database so your application doesn't perform like crap when the data gets huge".

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• sudoers - simple explanation requested

  - by Redsandro

  Everytime I want to be able to run something that requires me to be a sudoer too many times, I need to google for the formatting of /etc/sudoers to remind me again what exactly is the proper way to write it. Now I see different writing styles in my sudoers file, which is the consequence of different google results over the months. I've also noticed that the second example (below) seems to work in XFCE, but not in Cinnamon (Gnome 3). This could be totally unrelated, but nontheless I'd like to know once and for all, what is the correct grammar of the sudoer line, and what is the difference between the given examples? redsandro ALL=NOPASSWD:/path/to/command redsandro ALL=(ALL) NOPASSWD:/path/to/command redsandro ALL=(ALL:ALL) NOPASSWD:/path/to/command Also, what are all the ALL's for? One user, one command, yet I need to use the ALL keyword up to three times? Am I doing this wrong? Of course, omitting NOPASSWD: makes you enter your password before you are permitted to run the command, but one point of confusion is the usage of = and :, for the final command that is the subject of the line can be prepended by either =, :, , or ), confusing grammar for similar semantics.

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• SQL Azure Book

  - by ScottKlein

  One of the hotest technology topics of the day is Azure. Being a SQL guy, I am all over this technology, especially SQL Azure. So much so that Herve Roggero and I are currently writing a book for APress on SQL Azure. This book will be out in September and will include deep and thorough coverage of SQL Azure, best practices, and how-to's. We are excited about this book and the technology. However, we'd like to hear from you. As we go around evangelizing SQL Azure at user groups, code camps, and SQL Saturday's, we see the range of "heard of it" to "experimenting with it". Very few are actually doing something with Azure. I'd like to know what your concerns/questions are regarding Azure.  More specifically, what functionality do you think is cool as well as what is lacking, and what would be your list of "must have's" to do something with Azure. We hear a lot regarding security concerns, lack of backup/restore, etc. Is there more? Herve and I will be posting frequently as we write to let you know what we find, what is cool, and what you can look forward to. I'm heading to Tech-Ed in June and hopefully will come back with some great things to tell you!

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• SQL Azure Book

  - by ScottKlein

  One of the hotest technology topics of the day is Azure. Being a SQL guy, I am all over this technology, especially SQL Azure. So much so that Herve Roggero and I are currently writing a book for APress on SQL Azure. This book will be out in September and will include deep and thorough coverage of SQL Azure, best practices, and how-to's. We are excited about this book and the technology. However, we'd like to hear from you. As we go around evangelizing SQL Azure at user groups, code camps, and SQL Saturday's, we see the range of "heard of it" to "experimenting with it". Very few are actually doing something with Azure. I'd like to know what your concerns/questions are regarding Azure.  More specifically, what functionality do you think is cool as well as what is lacking, and what would be your list of "must have's" to do something with Azure. We hear a lot regarding security concerns, lack of backup/restore, etc. Is there more? Herve and I will be posting frequently as we write to let you know what we find, what is cool, and what you can look forward to. I'm heading to Tech-Ed in June and hopefully will come back with some great things to tell you!

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• How to factorize code in Unreal Kismet (i.e. "Material Function"s for Kismet)

  - by Georges Dupéron

  In the Unreal Development Kit, when using the Material Editor, one can factorize frequently-used groups of nodes by creating a Material Function (content Browser ? right-click ? new matrial function, IIRC). When defining the behaviour of some actor in Kismet, one can easily have a dozen nodes involved. If I have many actors that share the same behaviour, then I'll copy-paste these nodes, and change the variables so they point to the other actors. This leads to inconsistencies (a modification in the behaviour of an actor isn't propagated in the copy-pasted nodes), complexity (you end up with hundreds of nodes), and generally useless effort. My question is : Can I create a "kismet function", just like a material function ? Note: I'd rather avoid using UnrealScript. I don't even know where to type UnrealScripts, don't know where the documentation is and more generally don't have enough time to invest in learning UnrealScript. This "kismet function" feature must be usable by graphists (with little programming knowledge). If a (simple) script suffices to add this feature in the Kismet editor, so that one can create several "functions" without using UnrealScript, then fine, but I don't really want to have to write a script each time I want to factorize a few nodes. Thanks for any information !

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• Matrices: Arrays or separate member variables?

  - by bjz

  I'm teaching myself 3D maths and in the process building my own rudimentary engine (of sorts). I was wondering what would be the best way to structure my matrix class. There are a few options: Separate member variables: struct Mat4 { float m11, m12, m13, m14, m21, m22, m23, m24, m31, m32, m33, m34, m41, m42, m43, m44; // methods } A multi-dimensional array: struct Mat4 { float[4][4] m; // methods } An array of vectors struct Mat4 { Vec4[4] m; // methods } I'm guessing there would be positives and negatives to each. From 3D Math Primer for Graphics and Game Development, 2nd Edition p.155: Matrices use 1-based indices, so the first row and column are numbered 1. For example, a12 (read “a one two,” not “a twelve”) is the element in the first row, second column. Notice that this is different from programming languages such as C++ and Java, which use 0-based array indices. A matrix does not have a column 0 or row 0. This difference in indexing can cause some confusion if matrices are stored using an actual array data type. For this reason, it’s common for classes that store small, fixed size matrices of the type used for geometric purposes to give each element its own named member variable, such as float a11, instead of using the language’s native array support with something like float elem[3][3]. So that's one vote for method one. Is this really the accepted way to do things? It seems rather unwieldy if the only benefit would be sticking with the conventional math notation.

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• Ubuntu 12.04 still slow at mounting internal filesystem

  - by Matthew Goson

  I'm using Toshiba laptop with this configuration: - CPU: Core i5, 2.4GHz - RAM: 4GB - Graphics card: Intel - Hard disk: 500GB SATA I installed Ubuntu 12.04 64bit and got the same issue with this guy Very slow boot due to mounting filesytem, I tried all suggestions there but the slow boot issue still here. Here's a part of my dmesg: [ 2.041015] usbhid: USB HID core driver [ 2.101378] usb 1-1.6: new full-speed USB device number 5 using ehci_hcd [ 2.137980] atl1c 0000:04:00.0: version 1.0.1.0-NAPI [ 2.779080] EXT4-fs (sda2): mounted filesystem with ordered data mode. Opts: (null) [ 22.822597] udevd[381]: starting version 175 [ 22.837954] ADDRCONF(NETDEV_UP): eth0: link is not ready [ 22.850837] lp: driver loaded but no devices found [ 23.003822] Adding 7079096k swap on /dev/sda7. Priority:-1 extents:1 across:7079096k [ 23.407915] mei: module is from the staging directory, the quality is unknown, you have been warned. [ 23.408153] mei 0000:00:16.0: PCI->APIC IRQ transform: INT A -> IRQ 16 [ 23.408160] mei 0000:00:16.0: setting latency timer to 64 [ 23.408211] mei 0000:00:16.0: irq 44 for MSI/MSI-X [ 23.433196] [drm] Initialized drm 1.1.0 20060810 Additional information: my sda1 is a primary NTFS partition, sda2 is a primary ext4 partition which I installed Ubuntu onto. Other partitions are inside an extended partition.

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• As a programmer, what's the most valuable non-English (human) language to learn?

  - by Andrew M

  I was thinking that with my developer skills, learning new languages like French, German etc. might be easier for me now. I could setup the verbs as objects in Python and use dir(verb) to find its methods, tenses and stuff ;-) But seriously, if you're a professional developer, in my case in the UK, what's the best foreign language to learn from an employment perspective? I'm thinking, like Hindi - if all our programming jobs are getting outsourced to India, might as well position yourself to be the on-site, go-between guy. Mandarin - if the Chinese become the pre-eminent economy, the new USA, in ten or twenty years, then speaking their language would open up a huge market to you. Russian - maybe another major up-and-comer, but already closer to Western standards. More IT-sector growth here than anywhere else in the coming years? Japanese - drivers of global technology, being able to speak their language could give you a big competitive advantage over other Westerners But I'm just guessing/musing with all these points. If you have an opinion, or even better, some evidence, I'd like to hear it. If the programming things falls through then at least it'll make for more interesting holidays.

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• Ubuntu Server 12.04 as a router. Problem with DNS?? Or Routing table?

  - by Lorenzo

  I have a virtualbox lab made up of 4 Windows 2008 R2 servers (DC/DNS,SQL,SHAREPOINT, EXCHANGE) that are configured with static ip addresses with NIC's attached to Internal network. Everything works. I had the requirement to execute some tests that also access external services available on the internet. To keep things clean and similar to the production environment I have installed another VM, with Ubuntu Server 12.04 64 bit and configured (I hope) to work as a router like described on this post. This VM has two network interfaces: first is Bridged with the host and is used as a WAN connection and the other one attached in the Internal Network with its own static IP address on the internal network subnet. But actually the Windows servers does not connect to the internet while the unix one connects. I did a route command. this is the result: Kernel IP Routing table Destination Gateway Genmask Flags Metric Ref Use Iface default 10.69.121.1 0.0.0.0 UG 100 0 0 eth0 10.69.121.0 * 255.255.255.0 U 0 0 0 eth0 192.168.83.0 * 255.255.255.0 U 0 0 0 eth1 Can somebody help me with this configuration? :) Thanks! Addendum: I forgot to mention that one of the windows server hosts a DNS service for which I should maybe configure a forwarding server but I do not exactly know which server to forward on... :(

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• Calculate minimum moves to solve a puzzle

  - by Luke

  I'm in the process of creating a game where the user will be presented with 2 sets of colored tiles. In order to ensure that the puzzle is solvable, I start with one set, copy it to a second set, then swap tiles from one set to another. Currently, (and this is where my issue lies) the number of swaps is determined by the level the user is playing - 1 swap for level 1, 2 swaps for level 2, etc. This same number of swaps is used as a goal in the game. The user must complete the puzzle by swapping a tile from one set to the other to make the 2 sets match (by color). The order of the tiles in the (user) solved puzzle doesn't matter as long as the 2 sets match. The problem I have is that as the number of swaps I used to generate the puzzle approaches the number of tiles in each set, the puzzle becomes easier to solve. Basically, you can just drag from one set in whatever order you need for the second set and solve the puzzle with plenty of moves left. What I am looking to do is after I finish building the puzzle, calculate the minimum number of moves required to solve the puzzle. Again, this is almost always less than the number of swaps used to create the puzzle, especially as the number of swaps approaches the number of tiles in each set. My goal is to calculate the best case scenario and then give the user a "fudge factor" (i.e. 1.2 times the minimum number of moves). Solving the puzzle in under this number of moves will result in passing the level. A little background as to how I currently have the game configured: Levels 1 to 10: 9 tiles in each set. 5 different color tiles. Levels 11 to 20: 12 tiles in each set. 7 different color tiles. Levels 21 to 25: 15 tiles in each set. 10 different color tiles. Swapping within a set is not allowed. For each level, there will be at least 2 tiles of a given color (one for each set in the solved puzzle). Is there any type of algorithm anyone could recommend to calculate the minimum number of moves to solve a given puzzle?

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• Circular database relationships. Good, Bad, Exceptions?

  - by jim

  I have been putting off developing this part of my app for sometime purely because I want to do this in a circular way but get the feeling its a bad idea from what I remember my lecturers telling me back in school. I have a design for an order system, ignoring the everything that doesn't pertain to this example I'm left with: CreditCard Customer Order I want it so that, Customers can have credit cards (0-n) Customers have orders (1-n) Orders have one customer(1-1) Orders have one credit card(1-1) Credit cards can have one customer(1-1) (unique ids so we can ignore uniqueness of cc number, husband/wife may share cc instances ect) Basically the last part is where the issue shows up, sometimes credit cards are declined and they wish to use a different one, this needs to update which their 'current' card is but this can only change the current card used for that order, not the other orders the customer may have on disk. Effectively this creates a circular design between the three tables. Possible solutions: Either Create the circular design, give references: cc ref to order, customer ref to cc customer ref to order or customer ref to cc customer ref to order create new table that references all three table ids and put unique on the order so that only one cc may be current to that order at any time Essentially both model the same design but translate differently, I am liking the latter option best at this point in time because it seems less circular and more central. (If that even makes sense) My questions are, What if any are the pros and cons of each? What is the pitfalls of circular relationships/dependancies? Is this a valid exception to the rule? Is there any reason I should pick the former over the latter? Thanks and let me know if there is anything you need clarified/explained. --Update/Edit-- I have noticed an error in the requirements I stated. Basically dropped the ball when trying to simplify things for SO. There is another table there for Payments which adds another layer. The catch, Orders can have multiple payments, with the possibility of using different credit cards. (if you really want to know even other forms of payment). Stating this here because I think the underlying issue is still the same and this only really adds another layer of complexity.

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