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  • Ur/Web new purely functional language for web programming?

    - by Phuc Nguyen
    I came across the Ur/Web project during my search for web frameworks for Haskell-like languages. It looks like a very interesting project done by one person. Basically, it is a domain-specific purely functional language for web programming, taking the best of ML and Haskell. The syntax is ML, but there are type classes and monad from Haskell, and it's strictly evaluated. Server-side is compiled to native code, client to Javascript. See the slides and FAQ page for other advertised advantages. Looking at the demos and their source code, I think the project is very promising. The latest version is something 20110123, so it seems to be under active development at this time. My question: Has anybody here had any further experience with it? Are there problems/annoyances compared to Haskell, apart from ML's slightly more verbose syntax? Even if it's not well known yet, I hope more people will know of it. OMG this looks very cool to me. I don't want this project to die!!

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  • Haskell web frameworks survey

    - by Phuc Nguyen
    There are several web frameworks for Haskell like Happstack, Snap, and Yesod, and probably a few more. In what aspects do they differ from each other? For example: features (e.g. server only, or also client scripting, easy support for different kinds of database) maturity (e.g. stability, documentation quality) scalability (e.g. performance, handy abstraction) main targets Also, what are examples of real-world sites / web apps using these frameworks? Many thanks.

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  • Is there a Javascript library for creating vintage photos?

    - by Nguyen Thanh Tu
    I'm working on a Canvas object in HTML5, and I am attempting to make some photos look "better". I tried VintageJS, an existing photo-retouching Javascript library, and Picozu, a web application cloning some Adobe Photoshop functionalities, but I'm still not happy. Can you help me with an algorithm or point to an existing Javascript library that would allow me to make my photos look like the following example? http://i46.photobucket.com/albums/f137/thanhtu_zx/Untitled-1.jpg

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  • Is is good or bad to have the email address of a domain's registrant on the same domain?

    - by Eric Nguyen
    Say I own domain abc.com. I think it's a bad idea to use [email protected] as the registrant's (myself) email address. This will cause problems when I need to transfer the domain to another registrar e.g. GoDaddy. The new registrar will then try to send email to [email protected] which is unlikely to function normally since the DNS settings are undergoing changes. So I believe it's best to use email address independent from the domains I own as the registrant's email address. (Isn't it the practice Google Apps is using?) Have I missed something here or am I right?

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  • WD external hard drive not detected

    - by Khang Nguyen
    I am a beginner in Ubuntu. And I have just installed Ubuntu 11.10 in my Dell laptop. When I plugged my WD external hard drive in, it read the first time, but since I have a unlock.exe file (password for the hard drive). So I installed Wine to read it. But it gives me an error. I restart the machine, and plugged the hard drive in again. And it is not recognized anymore. Can anybody help me, please? Thank you!

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  • Avoid SEO loss after URL structure change

    - by Eric Nguyen
    We recently re-wrote our site from Umbraco to WordPress. This has been done by third-party developers. I have been the project manager and it is my mistake that I haven't notice the change of URLs that affect SEO until now. New site was launch last Thursday. The old URL for a "place" (a WordPress custom post type, in case you're WordPress expert and want/ need to point me to another discussion on WP Stackexchange) page is as follows: ourdomain.com/singapore/central/alexandra/an-interesting-place Now it has been changed to ourdomain.com/places/an-interesting-place I have already requested the third-party developers to work rewriting the URLs to emulate the old URL structure. However, it's taking quite a lot of time (we have multiple custom post types e.g. events etc. so it might be complicated; the developers seem quite by blur when I first mentioned rewriting URLs for the custom post types) In the meantime, I wonder if there is a quicker work around for this 1) Use .htaccess to rewrite ourdomain.com/singapore/central/alexandra/an-interesting-place to ourdomain.com/places/an-interesting-place This should avoid 90% loss of the search traffic. I suppose I can learn how to do this quite quickly but no harm mentioning it here 2) Use rel="canonical" to indicate that ourdomain.com/places/an-interesting-place is the exact duplicate of ourdomain.com/singapore/central/alexandra/an-interesting-place I will definitely go for both approaches (and also I'm changing 404 page to cater for this temporary isue) but I wonder if 2) is even feasible and if I have missed anything. Is there anything else you could recommend me in this situation. Let me know if my question is not clear anywhere. Clarifications The old website is on a Windows Server EC2 completely separated from the Linux EC2 instance on which the new site is running. In addition, the same domain "ourdomain.com" is used here (an A record is used to point to an EC2 Elastic IP). Therefore, the old server is completely inaccessible at the moment, unless you we use the IP address to old server (which doesn't help me at all in this case). Even if the old server is accessible, I can't see where one can put the .htaccess or a HTML file to do 301 redirect here. Unless I'm successful with my approach 1) or the developers can rewrite the URLs with coding, 404 page is really a choice for me.

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  • Transfer .com domain to GoDaddy - websites running on same domain - 3 weeks left until expiration, 2 days left web hosting

    - by Eric Nguyen
    Our company purchased this abc.com domain from a local registrar. The domain will expire in about 3 weeks. We have our main websites running on this abc.com domain and they cannot be down for too long. The web hosting service will end in 2 days. Our websites are already hosted and they are up and running on Amazon EC2. We would like to transfer the domain to GoDaddy now or as soon as possible. (since we have many other domains there and we belive GoDaddy will be better in long-term considering the prices and the features it offers) There are many questions on the decision to transfer the domain to GoDaddy: 1) Cost and time required to move out of our local registrar? This is currently unknown as I'm still trying to retrieve the agreement we have with them 2) How does the 3 week time left until expiration of the domain matters here? Should we wait until the domain expires and then purchase in through GoDaddy? How long would such process take as I suppose our websites will be down during that time? Any other drawbacks? 3) What can I do to ensure our websites will continue functioning regardless of the domain transfer process? It seems the actual registrar here is enom.com and the local registrar here just partners with it I suppose I should then park the abc.com domain with enom.com and make changes to DNS settings so that our websites can continue to be hosted on EC2 as normal. How long does it normally take the domain to be transferred to GoDaddy completely? Is it even possible at all to keep our websites are up and running during the whole domain transfer process? Apologies that I'm throwing many questions at the same time here. It's rather last minutes and I suddenly realised there are too many unknown risks.

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  • How To Build An Enterprise Application - Introduction

    - by Tuan Nguyen
    An enterprise application is a software which fulfills 4 core quality attributes: Reliability Flexibility Reusability Maintainability Reliability is the ability of a system or component to perform its required functions under stated conditions for a specific period of time. Because there are no ways more than testing to make sure a system is reliability, we can exchange the term reliability with the term testability. Flexibility is the ability of changing a system's core features without violating unrelated features or components. Although flexibility can helps us to achieve interoperability easily but the opposite is not true. For example, a program might run on multiple platforms, contains logic for many scenarios but that wouldn't mean it was flexibility if it forces us rewrite code in all components when we just want to change some aspects of a feature it had. Reusability is the ability of sharing one or more system's components for another system. We should just open a component's reusability in the context in which it is used. For example, we write classes that implement UI logic and deliver them to only classes which implementing UI. Maintainability is the ability of adding or removing features to a system after it was released. Maintainability consists of many factors such as readability, analyzability, extensibility therein extensibility is critical. Maintainability requires us to write code that is longer and complexer than normal but it doesn't mean we introduce unneccessarily complex code. We always try to make our code clear and transparent to everyone. An application enterprise is built on an enterprise design which consists of two parts: low-level design and high-level design. At low-level design, it focuses on building loose-coupled classes or components. Particularly, it recommends: Each class or component undertakes only single responsibility (design based on unit test) Classes or components implement and work through interfaces (design based on contract) Dependency relationship between classes and components could be injected at run-time (design based on dependency) At high-level design, it focuses on architecting system into tiers and layers. Particularly, it recommends: Divide system into subsystems for deployment. Each subsytem is called a tier. Typical, an enterprise application would have 3 tiers as illustrated in the following figure: Arrange classes and components to logical containers called layers. Typical, an enterprise application would have 5 layers as illustrated in the following figure

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  • Setting up CLASSPATH and ant in Ubuntu

    - by Dzung Nguyen
    I just started to learn Java using Thinking in Java book, and have some troubles using ant. I'm using Ubuntu 12.04, and have openjdk 7 java installed. I also setup the CLASSPATH to be the code folder When I run ant in code folder, this is the output: Exception in thread "main" java.lang.RuntimeException: JDK 1.4.1 or higher is required to run the examples in this book. [CheckVersion] at com.bruceeckel.tools.CheckVersion.main(Unknown Source) However when I run java -version, this is the output: java version "1.6.0_27" OpenJDK Runtime Environment (IcedTea6 1.12.5) (6b27-1.12.5-0ubuntu0.12.04.1) OpenJDK 64-Bit Server VM (build 20.0-b12, mixed mode) How to setup ant and classpath correctly?

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  • installing Oracle Database 10g XE Server in Ubuntu 11.04, "E: Unable to locate package oracle-xe"

    - by Nguyen Phi Vu
    I have read many posts for installing Oracle Database 10g XE Server in Ubuntu, such as this But I get an error: E: Unable to locate package oracle-xe when execute the command sudo apt-get install oracle-xe At the previous step (sudo apt-get update), it also notices that E: Some index files failed to download. They have been ignored, or old ones used instead. Did any one meet and solve this problem? I have searched for this problem but got no proper answer.

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  • Economical DNS hosting separate from local registrar for country specific TLDs - email or web hosting not required

    - by Eric Nguyen
    Our company owns many country specific top level domains (TLDs; .sg, .my). We will purchase more for other countries in all South East Asia. These domains are associated with our websites hosted on Amazon EC2. The DNS records are currently hosted on a dedicated server that will shut down tomorrow. (The name servers are set to the ones of a web hosting company) Therefore, I will need to host the DNS records somewhere else. Hosting the DNS records with the local registrar costs SGD18 a year per domain in addition to the domain price (which is already very expensive but we have no choice). It would be convenience to host DNS recors for all the country specific TLDs we have using a single service, separate from the local registrars from which we bought the domains. A few searches prompted examples like Amazon Route 53 and dnsmadeeasy.com and the likes. However, since I'm only concern about the country specific TLDs, not .com 1) Is it really economical to host DNS records of all domains in 1 single place as described above? (Have the relevant countries and/or the local registrars done something to keep their monopoly and always charges ridiculous prices for their country specific TLDs?) 2) I would imagine I will need to tell the local registrars to update the name servers to those of the DNS hosting service provider e.g. dnsmadeeasy.com here. Am I correct about how it works here? 3) Will I be able point the TLDs themselves to IP addresses I desire (the EC2 instances where my websites are) or will I only able to do so with the subdomains? 4) Are there any drawbacks that I should know here? Background about our needs: We need the websites associated with the country TLDs to be up and running all the times Also, we'll need to be able to add/edit A and CNAME records We use Google Apps for Business for internal email so I will need to be able to add/edit MX records and TXT records

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  • 1 Google Analytics account or top-level domain + profiles for sub-domains vs. 1 account for each sub-domain

    - by Eric Nguyen
    We have the following websites An online magazine Singapore edition - sg.abc.com The same online magazine Malaysia edition - my.abc.com Forums around the same subjects as the online magazine but functions independently - forums.abc.com Classifieds site rather also around the same subjects but functions independently - directory.abc.com Each of the above websites currently has its own Google Analytics account. abc.com has a separate Google Analytics account too. sg.abc.com has the most traffic and generates most revenues Are there any practical benefits of merging all the above sub-domains to be under abc.com? I can think of more reliable analytics and consistency for sure. Are there more? cross-sales?

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  • OpenGL 2.1+ Render with data returned form assimp library

    - by Bình Nguyên
    I have just readed this tutorial about load a 3D model file: http://www.lighthouse3d.com/cg-topics/code-samples/importing-3d-models-with-assimp/#comment-14551. Its render routine uses a recursive_render function to scan all node. My question: What is a aiNode struct store? What different form this method and above method: for (int i=0; imNumMesh; ++i) { draw scene-mMeshes[i]; } Thanks for reading!

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  • URL masking with .htaccess

    - by Michael Nguyen
    I need a hardcore programmer to help me with URL masking. So this is my situation. My website www.michaelfotograf.dk/blog/ is the main site that needs to be configured. I have another website/webhotel called www.umagepar.dk www.umagepar.dk is redirected to www.michaelfotograf.dk/blog/ The blog is an ongoing project where i post a lot of stuff to get my ranking higher on google. www.umagepar.dk which redirect to www.michaelfotograf.dk/blog/ is also a project on is own, so I do not want people to know, that it is a blog connected with www.michaelfotograf.dk/blog/ I therefore need to mask www.michaelfotograf.dk/blog/ so it will be called www.umagepar.dk in the URL in the searchbar at all times! What I need is a programmer that can do this for me. Name your price, and I'll see if I can affort it. Michael

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  • Is there a more intelligent way to do this besides a long chain of if statements or switch?

    - by Harrison Nguyen
    I'm implementing an IRC bot that receives a message and I'm checking that message to determine which functions to call. Is there a more clever way of doing this? It seems like it'd quickly get out of hand after I got up to like 20 commands. Perhaps there's a better way to abstract this? public void onMessage(String channel, String sender, String login, String hostname, String message){ if (message.equalsIgnoreCase(".np")){ // TODO: Use Last.fm API to find the now playing } else if (message.toLowerCase().startsWith(".register")) { cmd.registerLastNick(channel, sender, message); } else if (message.toLowerCase().startsWith("give us a countdown")) { cmd.countdown(channel, message); } else if (message.toLowerCase().startsWith("remember am routine")) { cmd.updateAmRoutine(channel, message, sender); } }

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  • Okular can't read pdf files

    - by hoang anh Nguyen
    I recently have installed Okular on my Ubuntu 14.04. The problem is when I open pdf files, okular gives me the error "Can not find a plugin which is able to handle the document being passed." When I ran Okular by Terminal, this is the message I get. okular(14100)/kdeui (KIconLoader): Error: standard icon theme "oxygen" not found! okular(14100)/kdeui (KIconLoader): Error: standard icon theme "oxygen" not found! okular(14100) KPixmapSequence::Private::loadSequence: Invalid pixmap specified. okular(14100) KPixmapSequence::Private::loadSequence: Invalid pixmap specified. okular(14100) KPixmapSequence::frameSize: No frame loaded okular(14100) KPixmapSequence::Private::loadSequence: Invalid pixmap specified. okular(14100) KPixmapSequence::frameSize: No frame loaded okular(14100) KPixmapSequence::Private::loadSequence: Invalid pixmap specified. okular(14100) KPixmapSequence::frameSize: No frame loaded okular(14100) KPixmapSequence::Private::loadSequence: Invalid pixmap specified. okular(14100) KPixmapSequence::frameSize: No frame loaded okular(14100) KPixmapSequence::Private::loadSequence: Invalid pixmap specified. okular(14100) KPixmapSequence::frameSize: No frame loaded okular(14100) KPixmapSequence::Private::loadSequence: Invalid pixmap specified. okular(14100) KPixmapSequence::frameSize: No frame loaded okular(14100): No ksycoca4 database available! okular(14100)/kdecore (trader) KServiceTypeTrader::defaultOffers: KServiceTypeTrader: serviceType "okular/Generator" not found okular(14100)/kdecore (KConfigSkeleton) KCoreConfigSkeleton::writeConfig: okular(14100)/kdecore (KConfigSkeleton) KCoreConfigSkeleton::writeConfig: okular(14100)/kdecore (KConfigSkeleton) KCoreConfigSkeleton::writeConfig: okular(14100)/kdecore (KConfigSkeleton) KCoreConfigSkeleton::writeConfig: okular(14100)/kdecore (KConfigSkeleton) KCoreConfigSkeleton::writeConfig: okular(14100): No ksycoca4 database available! okular(14100)/kdecore (trader) mimeTypeSycocaServiceOffers: KMimeTypeTrader: mimeType "application/pdf" not found okular(14100): No ksycoca4 database available! okular(14100)/kdecore (trader): KMimeTypeTrader: couldn't find service type "okular/Generator" Please ensure that the .desktop file for it is installed; then run kbuildsycoca4. okular(14100)/okular (app) Okular::Document::openDocument: No plugin for mimetype '"application/pdf"'. okular(14100): Couldn't start knotify from knotify4.desktop: "KLauncher could not be reached via D-Bus. Error when calling start_service_by_desktop_path: The name org.kde.klauncher was not provided by any .service files " okular(14100)/kdeui (KNotification) KNotification::slotReceivedIdError: Error while contacting notify daemon "The name org.kde.knotify was not provided by any .service files" X Error: BadWindow (invalid Window parameter) 3 Major opcode: 20 (X_GetProperty) Resource id: 0x2a0002e okular(14110) KPixmapSequence::Private::loadSequence: Invalid pixmap specified. okular(14110) KPixmapSequence::frameSize: No frame loaded okular(14110) KPixmapSequence::Private::loadSequence: Invalid pixmap specified. okular(14110) KPixmapSequence::frameSize: No frame loaded okular(14110) KPixmapSequence::Private::loadSequence: Invalid pixmap specified. okular(14110) KPixmapSequence::frameSize: No frame loaded X Error: BadWindow (invalid Window parameter) 3 Major opcode: 20 (X_GetProperty) Resource id: 0x2a0001d X Error: BadWindow (invalid Window parameter) 3 Major opcode: 20 (X_GetProperty) Resource id: 0x2a0001d I would be much appreciated for any suggestion to solve this problem. Thanks a lot :)

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  • Problem with graphic Ubuntu 12.04 (not sure if it's because of the graphic driver)

    - by Duy Nguyen
    Ubuntu 12.04 was functioning properly . Then after an update, some graphic elements stop working properly. I could not launch programs that has 3D elements. Work space switcher's window displays 2D window instead of a 3D like usual. In Details menu, the Graphic row is blank. I am using Intel GMA 4500MHD graphic card. I am guessing that the driver is not properly installed? Anyone has the same issue? Please help!

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  • Cocos2d-x v3.1 for WinPhone 8 auto change texture after resumed from background

    - by Bình Nguyên
    I have some sprites in my game (for Windows Phone 8). These are my steps to reproduce the problem: Open game Play (this is an optional step) Press Windows button to send game to background Press Back button to resume game The problem is: After the game has resumed, some sprites exchange textures, some sprites go black (like there is no texture being bound). I'm using cocos2dx version 3.1.1. Can someone help me to solve this problem?

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  • sudo: must be setuid root

    - by Phuong Nguyen
    Recently, due to some messy stuff with master boot record, I have to re-install my Ubuntu. Before doing that, I back up all folder (exclude root, bin, sbin, tmp, media, mnt) to a NTFS partition. After installation of Ubuntu, I copied back all the folder using a nautilus (running by sudo nautilus). After that, I reboot my computer. And boom, now I cannot run sudo any more, my network services cannot run. When I run sudo from a terminal, I ge "must be setuid root" error. In ubuntu, root account is disabled by default, I don't know why all these files is no longer under ownership of my account. How would I recover back?

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  • Organize mail with Evolution & Gmail IMAP

    - by Phuong Nguyen
    With thunderbird & Gmail POP, things are very easy. I can create filter that will automatically move the mail to the appropriate sub-folder. However, with evolution & Gmail IMAP, I find things very messy. I cannot figure out how to create filter that will automatically move my email to a sub folder. Please advice. Thanks

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  • FreeNX is very unresponsive compare to VNC when using over LAN

    - by Phuong Nguyen
    I find FreeNX is quite unresponsive compare to VNC when using over LAN. I run Netbeans inside a Quad Core Server and remote desktop to it through both NX & VNC. For VNC, the screen will be nicely updated as I scroll the Netbean IDE For FreeNX, flickering happened and the mouse cursor become unresponsive as I tried to do the samething. Have anyone encountered the same? I don't like VNC because when VNC doesnot correctly understand the "Windows" key (interpreted as Super L instead of Mod) Is there any adjustment that can avoid that annoyance? I have tried both FreeNX-Server and NeatX-Server and both resulted in the same unresponsiveness.

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  • New install indicator while install updating on Ubuntu

    - by Phuong Nguyen
    In the update manager of ubuntu I see several libraries marked with New Install. I don't know what is the benefit I can get from that New Install? What if I just want a normal upgrade, not a New Install? (I have 3 Linux Kernel versions right now (that I can see and select from Grub menu), and I think I don't need all of them since I always use the latest Kernel).

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