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  • Are there any purely functional Schemes or Lisps?

    - by nickname
    Over the past few months, I've put a lot of effort into learning (or attempting to learn) several functional programming languages. I really like math, so they have been very natural for me to use. Simply to be more specific, I have tried Common Lisp, Scheme, Haskell, OCaml, and (a little bit of) Erlang. I did not like the syntax of OCaml and do not have enough Erlang knowledge to make a judgment on it yet. Because of its consistent and beautiful (non-)syntax, I really like Scheme. However, I really do appreciate the stateless nature of purely functional programming languages such as Haskell. Haskell looks very interesting, but the amount of inconsistent and non-extendable syntax really bothered me. In the interest of preventing a Lisp vs Haskell flame war, just pretend that I can't use Haskell for some other reason. Therefore, my question is: Are there any purely functional Schemes (or Lisps in general)?

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  • Best way to convert between [Char] and [Word8]?

    - by cmars232
    I'm new to Haskell and I'm trying to use a pure SHA1 implementation in my app (Data.Digest.Pure.SHA) with a JSON library (AttoJSON). AttoJSON uses Data.ByteString.Char8 bytestrings, SHA uses Data.ByteString.Lazy bytestrings, and some of my string literals in my app are [Char]. This article seems to indicate this is something still being worked out in the Haskell language/Prelude: http // hackage.haskell.org/trac/haskell-prime/wiki/CharAsUnicode And this one lists a few libraries but its a couple years old: http //blog.kfish.org/2007/10/survey-haskell-unicode-support.html [Links broken because SO doesn't trust me -- whatever...] What is the current best way to convert between these types, and what are some of the tradeoffs? I don't want to pick something that is obsolete... Thanks!

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  • Understanding node.js: some real-life examples

    - by steweb
    Hi all! As a curious web developer I've been hearing about node.js for several months and (just) now I'd like to learn it and, most of all, understand its "engine". So, as a real newbie about node.js I'm going to follow some tutorials. And as every new technology over the internet, find a very good and exhaustive tutorial is like looking for a needle in a haystack :) My "big question" can be split into this 3 sub-questions: I know node.js can be very useful to build web-chats. But, apart from this example (and from helloworld one :D), how could I use it? Which are the real-life examples that let me think i.e. "oh, it's fantastic, I could really integrate it for my daily projects"? I also know it implements some JS specifications. It is required to deeply know other programming languages apart from JS? Where can I find a good reference (basically, I don't want to search "node.js reference" on google hoping to be lucky enough to get some good websites)? Thanks everyone!

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  • Procedural Generation of tile-based 2d World

    - by Matthias
    I am writing a 2d game that uses tile-based top-down graphics to build the world (i.e. the ground plane). Manually made this works fine. Now I want to generate the ground plane procedurally at run time. In other words: I want to place the tiles (their textures) randomised on the fly. Of course I cannot create an endless ground plane, so I need to restrict how far from the player character (on which the camera focuses on) I procedurally generate the ground floor. My approach would be like this: I have a 2d grid that stores all tiles of the floor at their correct x/y coordinates within the game world. When the players moves the character, therefore also the camera, I constantly check whether there are empty locations in my x/y map within a max. distance from the character, i.e. cells in my virtual grid that have no tile set. In such a case I place a new tile there. Therefore the player would always see the ground plane without gaps or empty spots. I guess that would work, but I am not sure whether that would be the best approach. Is there a better alternative, maybe even a best-practice for my case?

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  • Writing a "Hello World" Device Driver for kernel 2.6 using Eclipse

    - by Isaac
    Goal I am trying to write a simple device driver on Ubuntu. I want to do this using Eclipse (or a better IDE that is suitable for driver programming). Here is the code: #include <linux/module.h> static int __init hello_world( void ) { printk( "hello world!\n" ); return 0; } static void __exit goodbye_world( void ) { printk( "goodbye world!\n" ); } module_init( hello_world ); module_exit( goodbye_world ); My effort After some research, I decided to use Eclipse CTD for developing the driver (while I am still not sure if it supports multi-threading debugging tools). So I: Installed Ubuntu 11.04 desktop x86 on a VMWare virtual machine, Installed eclipse-cdt and linux-headers-2.6.38-8 using Synaptic Package Manager, Created a C Project named TestDriver1 and copy-pasted above code to it, Changed the default build command, make, to the following customized build command: make -C /lib/modules/2.6.38-8-generic/build M=/home/isaac/workspace/TestDriver1 The problem I get an error when I try to build this project using eclipse. Here is the log for the build: **** Build of configuration Debug for project TestDriver1 **** make -C /lib/modules/2.6.38-8-generic/build M=/home/isaac/workspace/TestDriver1 all make: Entering directory '/usr/src/linux-headers-2.6.38-8-generic' make: *** No rule to make target vmlinux', needed byall'. Stop. make: Leaving directory '/usr/src/linux-headers-2.6.38-8-generic' Interestingly, I get no error when I use shell instead of eclipse to build this project. To use shell, I just create a Makefile containing obj-m += TestDriver1.o and use the above make command to build. So, something must be wrong with the eclipse Makefile. Maybe it is looking for the vmlinux architecture (?) or something while current architecture is x86. Maybe it's because of VMWare? As I understood, eclipse creates the makefiles automatically and modifying it manually would cause errors in the future OR make managing makefile difficult. So, how can I compile this project on eclipse?

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  • Oracle Enterprise Manager sessions on the last day of the Oracle Open World

    - by Anand Akela
    Hope you had a very productive Oracle Open World so far . Hopefully, many of you attended the customer appreciation event yesterday night at the Treasures Islands.   We still have many enterprise manager related sessions today on Thursday, last day of Oracle Open World 2012. Download the Oracle Enterprise Manager 12c OpenWorld schedule (PDF) Oracle Enterprise Manager Cloud Control 12c (and Private Cloud) Time Title Location 11:15 AM - 12:15 PM Application Performance Matters: Oracle Real User Experience Insight Palace Hotel - Sea Cliff 11:15 AM - 12:15 PM Advanced Management of JD Edwards EnterpriseOne with Oracle Enterprise Manager InterContinental - Grand Ballroom B 11:15 AM - 12:15 PM Spark on SPARC Servers: Enterprise-Class IaaS with Oracle Enterprise Manager 12c Moscone West - 3018 11:15 AM - 12:15 PM Pinpoint Production Applications’ Performance Bottlenecks by Using JVM Diagnostics Marriott Marquis - Golden Gate C3 11:15 AM - 12:15 PM Bringing Order to the Masses: Scalable Monitoring with Oracle Enterprise Manager 12c Moscone West - 3020 12:45 PM - 1:45 PM Improving the Performance of Oracle E-Business Suite Applications: Tips from a DBA’s Diary Moscone West - 2018 12:45 PM - 1:45 PM Advanced Management of Oracle PeopleSoft with Oracle Enterprise Manager Moscone West - 3009 12:45 PM - 1:45 PM Managing Sun Servers and Oracle Engineered Systems with Oracle Enterprise Manager Moscone West - 2000 12:45 PM - 1:45 PM Strategies for Configuring Oracle Enterprise Manager 12c in a Secure IT Environment Moscone West - 3018 12:45 PM - 1:45 PM Using Oracle Enterprise Manager 12c to Control Operational Costs Moscone South - 308 2:15 PM - 3:15 PM My Oracle Support: The Proactive 24/7 Assistant for Your Oracle Installations Moscone West - 3018 2:15 PM - 3:15 PM Functional and Load Testing Tips and Techniques for Advanced Testers Moscone South - 307 2:15 PM - 3:15 PM Oracle Enterprise Manager Deployment Best Practices Moscone South - 104 Stay Connected: Twitter | Facebook | YouTube | Linkedin | Newsletter

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  • Future Air Plane – A new world

    - by Rekha
    For the first time in my life, I wished I had more number of years to live. The world has evolved from the cave man life to the man who is almost The Creator. When I was about 12 years old, I was taken to Chennai Planetarium for my school excursion. That day we were made to lie down in a dark room and the ceiling was full of stars and planets. All those were just videos but the day still stands in my mind. Same kind of experience in real is waiting for our future generations.Even though the English movies have gone beyond imaginations, we still have chances to bring those imaginations to real. You must be wondering why all these hype. Recently Airbus unveiled a news on transparent Airplane in 2050. This Airplane will have a body transparent to view the sky from all sides of the airplane when we are flying high above the grounds. And it will have all possible technologies under one roof that would give immense pleasure for the passengers. The journey would be an unforgettable one for each one of us. Image and News Credit: Daily Telegraph This article titled,Future Air Plane – A new world, was originally published at Tech Dreams. Grab our rss feed or fan us on Facebook to get updates from us.

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  • Add a Real-Time Earth Wallpaper App to Ubuntu with xplanetFX

    - by Asian Angel
    Are you tired of the same old wallpaper on your Ubuntu desktop? Now you can go from blah to literally spacious, real-time styled views of Earth with the xplanetFX Wallpaper App for Linux. You can conveniently access the “file type” downloads, screenshots, and jump-to links all on the front page. For our example we downloaded the .deb setup file on our system. The setup file will need to download three additional files to complete the setup process. After those are downloaded all dependencies will have been met and you can complete the installation process. Once that is done you can find xplanetFX by going to the Accessories Section of your Ubuntu Menu. This is what the main control window looks like when you start xplanetFX for the first time. You should take a few moments to look through the various tabs and tweak the settings for items like location, screen resolution, timing, auto-start, etc. When you are done click on Execute and within a few moments your desktop will have a fresh new look! Note: It took ~30 seconds for the display to activate on our system. Have fun with xplanetFX! xplanetFX Homepage [via OMG! Ubuntu!] Latest Features How-To Geek ETC How to Enable User-Specific Wireless Networks in Windows 7 How to Use Google Chrome as Your Default PDF Reader (the Easy Way) How To Remove People and Objects From Photographs In Photoshop Ask How-To Geek: How Can I Monitor My Bandwidth Usage? Internet Explorer 9 RC Now Available: Here’s the Most Interesting New Stuff Here’s a Super Simple Trick to Defeating Fake Anti-Virus Malware Add a Real-Time Earth Wallpaper App to Ubuntu with xplanetFX The Citroen GT – An Awesome Video Game Car Brought to Life [Video] Final Man vs. Machine Round of Jeopardy Unfolds; Watson Dominates Give Chromium-Based Browser Desktop Notifications a Native System Look in Ubuntu Chrome Time Track Is a Simple Task Time Tracker Google Sky Map Turns Your Android Phone into a Digital Telescope

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  • How To Access Your eBook Collection Anywhere in the World

    - by Jason Fitzpatrick
    If you have an eBook reader it’s likely you already have a collection of eBooks you sync to your reader from your home computer. What if you’re away from home or not sitting at your computer? Learn how to download books from your personal collection anywhere in the world (or just from your backyard). You have an eBook reader, you have an eBook collection, and when you remember to sync your books to the collection on your computer everything is rosy. What about when you forget or when the syncing process for your device is a bit of a hassle? (We’re looking at you, iPad.) Today we’re going to show you how to download eBooks to your eBook reader from anywhere in the world using a cross-platform solution Latest Features How-To Geek ETC How to Use the Avira Rescue CD to Clean Your Infected PC The Complete List of iPad Tips, Tricks, and Tutorials Is Your Desktop Printer More Expensive Than Printing Services? 20 OS X Keyboard Shortcuts You Might Not Know HTG Explains: Which Linux File System Should You Choose? HTG Explains: Why Does Photo Paper Improve Print Quality? Sunrise on the Alien Desert Planet Wallpaper Add Falling Snow to Webpages with the Snowfall Extension for Opera [Browser Fun] Automatically Keep Up With the Latest Releases from Mozilla Labs in Firefox 4.0 A Look Back at 2010 Through Infographics Monitor the Weather with the Weather Forecast Extension for Opera Orbiting at the Edge of the Atmosphere Wallpaper

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  • Google Glasses–A new world in front of your eyes

    - by Gopinath
    Google is getting into a whole new business that would help us to see the world in a new dimension and free us from all gadgets we carry we today. Google Glasses is a wearable tiny computer that brings information in front of your eyes and lets you interact with it using voice commands. It’s a kind of glasses(spectacles) that you can wear to see and interact with the world in a new way.  With Google Glasses, for example you can look at a beautiful location and through voice you can instruct it to capture a photograph and share it to your friends. You don’t need a camera to capture the beautiful scene, you don’t need an App to upload and share it.  All you need is just Google Glasses By the way these glasses are not heavy head mountable stuff, they are very tiny one and look beautiful too. Check out the embedded video demo released by Google to see them in action and for sure you are going to be amazed.   Last year December 9 to 5 Google posted details about this secret project and NY Times says that these glasses would be available to everyone at affordable cost, anywhere between $250 and $600. It is powered by Android OS and the contains a GPS, motion sensor, camera, voice input & output devices. Check out Project Glass for more details.

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  • UPK Basics Hands On Lab at Oracle Open World Latin America

    - by user581320
    Orrcle Open World Latin America 2012 will be in Sao Paulo, Brazil December fourth through the sixth. There's so much to see and learn from at Oracle OpenWorld : keynotes, technical sessions, Oracle and partner demonstrations, hands-on labs, networking events, and more.  I will be presenting a hands-on lab at the show this year, Introduction to Oracle User Productivity Kit - Learn the Basics in the afternoon on Tuesday December 4th.  This nonstop one hour lab covers topics from Getting Started with UPK to the basics of creating an outline, some typical content and concluding with publishing some of the many outputs UPK is capable of.   If you are planning on attending the show, come by the lab and see what UPK is all about.  I’ll be in Sao Paulo all week to fulfill my need to extend California’s summer by another week (trip bonus) and to meet and discuss all things UPK with our customers and partners.  If you’re not registered for the show there is still time. Check out the Oracle Open World Latin America 2012 web site for all the details. I look forward to seeing you in Sao Paulo!  Peter Maravelias Principal Product Strategy Manager, Oracle UPK 

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  • Improve Customer Experience with Real-Time Scheduling

    - by ruth.donohue
    Recently, my husband rearranged his busy work schedule so that he could stay home an entire afternoon to wait for the alarm company to reset the password to our alarm system, only to discover at the end of the afternoon that the field service rep wasn’t going to be able to make the appointment after all. And, the company asked him to reschedule and block off time for another afternoon. Needless to say, my husband wasn’t happy with that experience. Unfortunately, customer experiences like this happen every day. As a business, you can’t afford these types of encounters. It’s too easy for your customers to turn to one of your competitors once they’ve reached the point of frustration. Customer experience and customer loyalty are more important than ever. So how can you prevent something like this from occurring? With the newly available Siebel Field Service Integration with Oracle Real-Time Scheduler, your service organization can: Create cost-optimized plans and schedules to improve operating efficiencies Deliver more accurate ETA’s and shorten appointment windows Minimize the impact of in-day events such as delays on site, sickness, poor weather conditions, and vehicle breakdowns Rather than requiring them to wait for an entire afternoon, imagine asking customers to be available for only an hour. And being able to commit to that time by working around unforeseen events and understanding the impact of delays or re-routings before they become customer issues. What would your customer experience and customer satisfaction be like then? Learn more about the Siebel Field Service Integration with Oracle Real-Time Scheduler: Register for and attend the upcoming webcast on Thursday, March 10th at 8:30 AM Pacific Time Read the press release, data sheet, and solution brief Visit the Siebel Field Service webpage

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  • Woman Is the World's First Computer Programmer? [closed]

    - by Sveta Bondarenko
    This week, on 10th December, we celebrate the 197th birth anniversary of Ada Lovelace, often considered as the world's first computer programmer. Ada became famous not only as a daughter of romantic poet Lord Byron but also as an outstanding 19th century mathematician. Her works on analytical engine are recognized as the first algorithm intended to be processed by a machine. Women always played a crucial role in the computer science evolution, but unfortunately, they are considered to be not so good at programming and engineering as men. Even though the fair sex makes up a growing portion of computer and Internet users, there is still a large gender gap in the field of Computer Science. But all is not lost! According to the study women's enrollment in the computer science raised from 7 percent in 1995 to 42 percent in 2000. And it is still increasing. Soon women will take a well-deserved position among the world's top computer programmers. After all, a number of notable female computer pioneers such as Ada Lovelace, Grace Hopper, and Anita Borg have proven that women make great computer scientists. But will women make great contributions to the modern technologies industry? Or successful and famous female computer programmer is just a pipe dream?

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  • Efficient mapping layout in 2D side-scroller, and collisions between character and the world

    - by Jack
    I haven't touched Visual Studio for a couple months now, but I was playing a game from the '90s toady and had an epiphany: I was looking for something what i didn't need, and I wasn't using what I knew correctly. One of those realizations was collision, so let me tell you a bit about my project that I was working on. The project's graphics looks like Mario or Dangerous Dave, etc., you get the idea - old-school pixels. So anyway I remember trying to think of something else than AABB for character form, but I couldn't think of anything. Perhaps I could get a suggestion for this? Another thing is the world - I don't want it to be just linear world, I want mountains, etc.. My idea is to use triangles, and no idea yet what to do if I want just part of the cube, say 3/4 or 2/4 or whatever. Hard-coding such things seems inefficient. P.S. I am not looking at the precision level offered by Box2D. Actually I remember trying to implement it at first, but I failed as my understanding of C++ wasn't advanced enough, as it'll be mentioned below. P.P.S. I am programming in C++, and I haven't done it for a couple months now. I have no means of testing it either, as my PC is broken down, and this one can barely run games from late '90s, not to speak about a compiler or a program with inefficient resource management... I am also not an expert (obviously), I don't even know if I can consider myself an average programmer. In short, I am simply curious about my thoughts and my past experience when programming the game. I may come back to it when my PC is fixed, I'm already filling a note about these things.

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  • Today @ OOW: Identity Management for the SoMoClo world

    - by B Shashikumar
    Today at OpenWord, we have a very interesting lineup of Identity Management sessions that discuss how to extend identity management securrley to cloud, mobile and social ecosystems. Here are 3 of the can’t miss identity management sessions today: Identity Management and the Cloud: Security is regularly identified as the #1 barrier to cloud service adoption. Oracle Identity Management is designed to help customers extend and connect core identity services to SaaS applications and systems. This session explores how organizations are using Oracle Identity Management with cloud services and how some customers are offering identity management as a cloud service. Real-time External Authorization for Applications, Middleware and Databases: Externalization of authorization is key to manageability and audit. This session covers enterprise wide authorization solution deployment best practices and real-world examples of using Oracle Entitlements Server—the one-stop standards-compliant authorization solution—for middleware, applications, and data. Delivering Secure WiFi on the Tube as an Olympics Legacy from London 2012: In this session, Virgin Media, the U.K.’s first combined provider of broadband, TV, mobile, and home phone services, shares how it is providing free secure Wi-Fi services to the London Underground, using Oracle Virtual Directory and Oracle Entitlements Server, leveraging back-end legacy systems that were never designed to be externalized. As an Olympics 2012 legacy, the Oracle architecture will form a platform to be consumed by other Virgin Media services such as video on demand. Here is the complete lineup of Identity Management sessions today at OOW.

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  • The latest Oracle Social Network News from Open World

    - by me
    Highlights Oracle and Partners showcase the latest development around  Oracle Social Network  (OSN) Integration of OSN Social Fabric into Business Applications like Finance, HCM and Customer Experience Partners like Cisco WebEx, Avaya, Weemo, Lingotek and HarQen showcase OSN integration Oracle shares details around internal OSN deployment Please visit us at 2413 Moscone South  Exhibition Hall  and  experience a live OSN demo Social Fabric  Oracle Social Network socializes your Applications, Process and Content within your Enterprise. Here are some examples what is shown at Oracle Open World. Socialize the Finance department Enable Finance departments to collaborate instantly during quarter close with real-time information access Enable finance professionals in the back office to easily interact with the rest of the company Provide privacy when discussing sensitive financial results within Conversations  Socialize Human Capital Management (HCM) Promotes attainable performance goals that achieve the business objectives of the enterprise Capture expertise across the network Continuous feedback loop provided that results in productivity and innovation improvement tied to higher employee engagement OSN and Customer Experience Find the person with the best skills to assist with the issue Real-time collaboration in  context of the issue Track an Agent’s collaboration contributions Identify and contribute relevant knowledge back to the system Cisco/Webex integration The Web Conferencing tool of your choice can be integrated with OSN. In the example below you can see the integration of the Cisco WebEx solution into OSN. and sure - this works on mobile devices as well  OSN @ Oracle Oracle has deployed OSN as part of the internal Fusion CRM application rollout. After just 4 month we can see impressive usage patterns.

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  • about freelancer in third world countries

    - by MaKo
    hello guys, one question that is been bogging me... first of all I want to say that I actually come from a third world country, so I am all up for opportunities for everybody... so here comes my consideration,,, I have been working as a programmer for Iphone apps (noob in the company), now in my new "first" world country (immigration can be good!!!), but seem to be getting more and more advertisement from sites like freelancer.com etc,,, so I would want to know what do you think about all this???, would the jobs be getting cheaper?? if a project can be done by say 10% of the cost overseas, what is stopping the employers of doing just that? is it worth it? how about the quality? from a local job and overseas job? and all other aspects I cannot think about?? I just want to know if all this years of learning are going to pay off? or if in a near future all programming jobs will just go to cheaper labor? (sweat shops??) ok hope to make sense in my ramblings,, cheers;)

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  • Heading Out to Oracle Open World

    - by rickramsey
    In case you haven't figured it out by now, Oracle reserves an awful lot of announcements for Oracle Open World. As a result, the show is always a lot of fun for geeks. What will the Oracle Solaris team have to say? Will the Oracle Linux team have any surprises? And what about Oracle hardware? For my part, I'll be one of the lizards at the OTN Lounge with the OTN crew, handing out t-shirts to system admins and developers, or anyone who is willing to impersonate one. I understand, not everyone can have the raw animal magnetism of a sysadmin, or the debonair sophistication of a C++ developer, so some of you have no choice but to pretend. I won't judge. I'll also be doing video interviews of as many techie people as I can corner. I've got more than 30 interviews already scheduled. Most of them will be 3-5 minutes long. I'll be asking our best technical minds what's cool about their latest technologies and what impact it will have on system admins or system developers. I'll be posting those videos here: Find OTN Systems Videos from Oracle Open World Here! We've got some great topics in mind. A dummies guide to hardware-assisted cryptography with Glenn Brunette. ZFS deduplication. The momentum building around Oracle Solaris 11, with Lynn Rohrer, plus conversations with partners who have deployed Oracle Solaris 11. Migrating to Oracle Database with SQL Developer. The whole database cloud thing. Oracle VM and, of course, Oracle Linux. So even if you can't be part of the fun, keep an eye out for the videos on our YouTube channel. - Rick Website Newsletter Facebook Twitter

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  • Handling Types for Real and Complex Matrices in a BLAS Wrapper

    - by mga
    I come from a C background and I'm now learning OOP with C++. As an exercise (so please don't just say "this already exists"), I want to implement a wrapper for BLAS that will let the user write matrix algebra in an intuitive way (e.g. similar to MATLAB) e.g.: A = B*C*D.Inverse() + E.Transpose(); My problem is how to go about dealing with real (R) and complex (C) matrices, because of C++'s "curse" of letting you do the same thing in N different ways. I do have a clear idea of what it should look like to the user: s/he should be able to define the two separately, but operations would return a type depending on the types of the operands (R*R = R, C*C = C, R*C = C*R = C). Additionally R can be cast into C and vice versa (just by setting the imaginary parts to 0). I have considered the following options: As a real number is a special case of a complex number, inherit CMatrix from RMatrix. I quickly dismissed this as the two would have to return different types for the same getter function. Inherit RMatrix and CMatrix from Matrix. However, I can't really think of any common code that would go into Matrix (because of the different return types). Templates. Declare Matrix<T> and declare the getter function as T Get(int i, int j), and operator functions as Matrix *(Matrix RHS). Then specialize Matrix<double> and Matrix<complex>, and overload the functions. Then I couldn't really see what I would gain with templates, so why not just define RMatrix and CMatrix separately from each other, and then overload functions as necessary? Although this last option makes sense to me, there's an annoying voice inside my head saying this is not elegant, because the two are clearly related. Perhaps I'm missing an appropriate design pattern? So I guess what I'm looking for is either absolution for doing this, or advice on how to do better.

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  • What does the `forall` keyword in Haskell/GHC do?

    - by JUST MY correct OPINION
    I've been banging my head on this one for (quite literally) years now. I'm beginning to kinda/sorta understand how the foreach keyword is used in so-called "existential types" like this: data ShowBox = forall s. Show s => SB s (This despite the confusingly-worded explanations of it in the fragments found all around the web.) This is only a subset, however, of how foreach is used and I simply cannot wrap my mind around its use in things like this: runST :: forall a. (forall s. ST s a) -> a Or explaining why these are different: foo :: (forall a. a -> a) -> (Char,Bool) bar :: forall a. ((a -> a) -> (Char, Bool)) Or the whole RankNTypes stuff that breaks my brain when "explained" in a way that makes me want to do that Samuel L. Jackson thing from Pulp Fiction. (Don't follow that link if you're easily offended by strong language.) The problem, really, is that I'm a dullard. I can't fathom the chicken scratchings (some call them "formulae") of the elite mathematicians that created this language seeing as my university years are over two decades behind me and I never actually had to put what I learnt into use in practice. I also tend to prefer clear, jargon-free English rather than the kinds of language which are normal in academic environments. Most of the explanations I attempt to read on this (the ones I can find through search engines) have these problems: They're incomplete. They explain one part of the use of this keyword (like "existential types") which makes me feel happy until I read code that uses it in a completely different way (like runST, foo and bar above). They're densely packed with assumptions that I've read the latest in whatever branch of discrete math, category theory or abstract algebra is popular this week. (If I never read the words "consult the paper whatever for details of implementation" again, it will be too soon.) They're written in ways that frequently turn even simple concepts into tortuously twisted and fractured grammar and semantics. (I suspect that the last two items are the biggest problem. I wouldn't know, though, since I'm too much a dullard to comprehend them.) It's been asked why Haskell never really caught on in industry. I suspect, in my own humble, unintelligent way, that my experience in figuring out one stupid little keyword -- a keyword that is increasingly ubiquitous in the libraries being written these days -- are also part of the answer to that question. It's hard for a language to catch on when even its individual keywords cause years-long quests to comprehend. Years-long quests which end in failure. So... On to the actual question. Can anybody completely explain the foreach keyword in clear, plain English (or, if it exists somewhere, point to such a clear explanation which I've missed) that doesn't assume I'm a mathematician steeped in the jargon?

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  • Book Review: Oracle ADF Real World Developer’s Guide

    - by Frank Nimphius
    Recently PACKT Publishing published "Oracle ADF Real World Developer’s Guide" by Jobinesh Purushothaman, a product manager in our team. Though already the sixth book dedicated to Oracle ADF, it has a lot of great information in it that none of the previous books covered, making it a safe buy even for those who own the other books published by Oracle Press (McGrwHill) and PACKT Publishing. More than the half of the "Oracle ADF Real World Developer’s Guide" book is dedicated to Oracle ADF Business Components in a depth and clarity that allows you to feel the expertise that Jobinesh gained in this area. If you enjoy Jobinesh blog (http://jobinesh.blogspot.co.uk/) about Oracle ADF, then, no matter what expert you are in Oracle ADF, this book makes you happy as it provides you with detail information you always wished to have. If you are new to Oracle ADF, then this book alone doesn't get you flying, but, if you have some Java background, accelerates your learning big, big, big times. Chapter 1 is an introduction to Oracle ADF and not only explains the layers but also how it compares to plain Java EE solutions (page 13). If you are new to Oracle JDeveloper and ADF, then at the end of this chapter you know how to start JDeveloper and begin your ADF development Chapter 2 starts with what Jobinesh really is good at: ADF Business Components. In this chapter you learn about the architecture ingredients of ADF Business Components: View Objects, View Links, Associations, Entities, Row Sets, Query Collections and Application Modules. This chapter also provides a introduction to ADFBC SDO services, as well as sequence diagrams for what happens when you execute queries or commit updates. Chapter 3 is dedicated to entity objects and  is one of many chapters in this book you will enjoy and never want to miss. Jobinesh explains the artifacts that make up an entity object, how to work with entities and resource bundles, and many advanced topics, including inheritance, change history tracking, custom properties, validation and cursor handling.  Chapter 4 - you guessed it - is all about View objects. Comparable to entities, you learn about the XM files and classes that make a view object, as well as how to define and work with queries. List-of-values, inheritance, polymorphism, bind variables and data filtering are interesting - and important topics that follow. Again the chapter provides helpful sequence diagrams for you to understand what happens internally within a view object. Chapter 5 focuses on advanced view object and entity object topics, like lifecycle callback methods and when you want to override them. This chapter is a good digest of Jobinesh's blog entries (which most ADF developers have in their bookmark list). Really worth reading ! Chapter 6 then is bout Application Modules. Beside of what application modules are, this chapter covers important topics like properties, passivation, activation, application module pooling, how and where to write custom logic. In addition you learn about the AM lifecycle and request sequence. Chapter 7 is about the ADF binding layer. If you are new to Oracle ADF and got lost in the more advanced ADF Business Components chapters, then this chapter is where you get back into the game. In very easy terms, Jobinesh explains what the ADF binding is, how it fits into the JSF request lifecycle and what are the metadata file involved. Chapter 8 then goes into building data bound web user interfaces. In this chapter you get the basics of JavaServer Faces (e.g. managed beans) and learn about the interaction between the JSF UI and the ADF binding layer. Later this chapter provides advanced solutions for working with tree components and list of values. Chapter 9 introduces bounded task flows and ADF controller. This is a chapter you want to read if you are new to ADF of have started. Experts don't find anything new here, which doesn't mean that it is not worth reading it (I for example, enjoyed the controller talk very much) Chapter 10 is an advanced coverage of bounded task flow and talks about contextual events  Chapter 11 is another highlight and explains error handling, trains, transactions and more. I can only recommend you read this chapter. I am aware of many documents that cover exception handling in Oracle ADF (and my Oracle Magazine article for January/February 2013 does the same), but none that covers it in such a great depth. Chapter 12 covers ADF best practices, which is a great round-up of all the tips provided in this book (without Jobinesh to repeat himself). Its all cool stuff that helps you with your ADF projects. In summary, "Oracle ADF Real World Developer’s Guide" by Jobinesh Purushothaman is a great book and addition for all Oracle ADF developers and those who want to become one. Frank

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  • World Backup Day

    - by red(at)work
    Here at Red Gate Towers, the SQL Backup development team have been hunkered down in their shed for the last few months, with the toolbox, blowtorch and chamois leather out, upgrading SQL Backup. When we started, autumn leaves were falling. Now we're about to finish, spring flowers are budding. If not quite a gleaming new machine, at the very least a familiar, reliable engine with some shiny new bits on it will trundle magnificently out of the workshop. One of the interesting things I've noticed about working on software development teams is that the team is together for so long 'implementing' stuff - designing, coding, testing, fixing bugs and so on - that you occasionally forget why you're doing what you're doing. Doubt creeps in. It feels like a long time since we launched this project in a fanfare of optimism and enthusiasm, and all that clarity of purpose and mission "yee-haw" has dissipated with the daily pressures of development. Every now and again, we look up from our bunker and notice all those thousands of users out there, with their different configurations and working practices and each with their own set of problems and requirements, and we ask ourselves "does anyone care about what we're doing?" Has the world moved on while we've been busy? Could we have been doing something more useful with the time and talent of all these excellent people we've assembled? In truth, you can research and test and validate all you like, but you never really know if you've done the right thing (or at least, something valuable for some users) until you release. All projects suffer this insecurity. If they don't, maybe you're not worrying enough about what you're building. The two enemies of software development are certainty and complacency. Oh, and of course, rival teams with Nerf guns. The goal of SQL Backup 7 is to make it so easy to schedule regular restores of your backups that you have no excuse not to. Why schedule a restore? Because your data is not as good as your last backup. It's only as good as your last successful restore. If you're not checking your backups by restoring them and running an integrity check on the database, you're only doing half the job. It seems that most DBAs know that this is best practice, but it can be tricky and time-consuming to set up, so it's one of those tasks that can get forgotten in the midst all the other demands on their time. Sometimes, they're just too busy firefighting. But if it was simple to do? That was our inspiration for SQL Backup 7. So it was heartening to read Brent Ozar's blog post the other day about World Backup Day. To be honest, I'd never heard of World Backup Day (Talk Like a Pirate Day, yes, but not this one); however, its emphasis on not just backing up your data but checking the validity of those backups was exactly the same message we had in mind when building SQL Backup 7. It's printed on a piece of A3 above our planning board - "Make backup verification so easy to do that no DBA has an excuse for not doing it" It's the missing piece that completes the puzzle. Simple idea, great concept, useful feature, but, as it turned out, far from straightforward to implement. The problem is the future. As Marty McFly discovered over the course of three movies, the future is uncertain and hard to predict - so when you are scheduling a restore to take place an hour, day, week or month after the backup, there are all kinds of questions that you wouldn't normally have to consider. Where will this backup live? Will it even exist at the time? Will it be split into multiple files? What will the file names be? Will it be encrypted? What files should it be restored to? SQL Backup needs to know what to expect at the time the restore job is actually run. Of course, a DBA will know the answer to all these questions, but to deliver the whole point of version 7, we wanted to make it easy for them to input that information into SQL Backup. We think we've done that. When you create your scheduled backup job, there is now an option to create a "reminder" to follow it up with a scheduled restore to verify the resulting backups. Actually, it's much more than a reminder, as it stores all the relevant data so you can click it and pre-populate the wizard with all the right settings to set up your verification restores. Simple. But, what do you think? We'd love you to try it. Post by Brian Harris

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  • 2012&ndash;The End Of The World Review

    - by Tim Murphy
    The end of the world must be coming.  Not because the Mayan calendar says so, but because Microsoft is innovating more than Apple.  It has been a crazy year, with pundits declaring not that the end of the world is coming, but that the end of Microsoft is coming.  Let’s take a look at what 2012 has brought us. The beginning of year is a blur.  I managed to get to TechEd in June which was the first time that I got to take a deep dive into Windows 8 and many other things that had been announced in 2011.  The promise I saw in these products was really encouraging.  The thought of being able to run Windows 8 from a thumb drive or have Hyper-V native to the OS told me that at least for developers good things were coming. I finally got my feet wet with Windows 8 with the developer preview just prior to the RTM.  While the initial experience was a bit of a culture shock I quickly grew to love it.  The media still seems to hold little love for the “reimagined” platform, but I think that once people spend some time with it they will enjoy the experience and what the FUD mongers say will fade into the background.  With the launch of the OS we finally got a look at the Surface.  I think this is a bold entry into the tablet market.  While I wish it was a little more affordable I am already starting to see them in the wild being used by non-techies. I was waiting for Windows Phone 8 at least as much as Windows 8, probably more.  The new hardware, better marketing and new OS features I think are going to finally push us to the point of having a real presence in the smartphone market.  I am seeing a number of iPhone users picking up a Nokia Lumia 920 and getting rid of their brand new iPhone 5.  The only real debacle that I saw around the launch was when they held back the SDK from general developers. Shortly after the launch events came Build 2012.  I was extremely disappointed that I didn’t make it to this year’s Build.  Even if they weren’t handing out Surface and Lumia devices I think the atmosphere and content were something that really needed to be experience in person.  Hopefully there will be a Build next year and it’s schedule will be announced soon.  As you would expect Windows 8 and Windows Phone 8 development were the mainstay of the conference, but improvements in Azure also played a key role.  This movement of services to the cloud will continue and we need to understand where it best fits into the solutions we build. Lower on the radar this year were Office 2013, SQL Server 2012, and Windows Server 2012.  Their glory stolen by the consumer OS and hardware announcements, these new releases are no less important.  Companies will see significant improvements in performance and capabilities if they upgrade.  At TechEd they had shown some of the new features of Windows Server 2012 around hardware integration and Hyper-V performance which absolutely blew me away.  It is our job to bring these important improvements to our company’s attention so that they can be leveraged. Personally, the consulting business in 2012 was the busiest it has been in a long time.  More companies were ready to attack new projects after several years of putting them on the back burner.  I also worked to bring back momentum to the Chicago Information Technology Architects Group.  Both the community and clients are excited about the new technologies that have come out in 2012 and now it is time to deliver. What does 2013 have in store.  I don’t see it be quite as exciting as 2012.  Microsoft will be releasing the Surface Pro in January and it seems that we will see more frequent OS update for Windows.  There are rumors that we may see a Surface phone in 2013.  It has also been announced that there will finally be a rework of the XBox next fall.  The new year will also be a time for us in the development community to take advantage of these new tools and devices.  After all, it is what we build on top of these platforms that will attract more consumers and corporations to using them. Just as I am 99.999% sure that the world is not going to end this year, I am also sure that Microsoft will move on and that most of this negative backlash from the media is actually fear and jealousy.  In the end I think we have a promising year ahead of us. del.icio.us Tags: Microsoft,Pundits,Mayans,Windows 8,Windows Phone 8,Surface

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  • Tales from the Trenches – Building a Real-World Silverlight Line of Business Application

    - by dwahlin
    There's rarely a boring day working in the world of software development. Part of the fun associated with being a developer is that change is guaranteed and the more you learn about a particular technology the more you realize there's always a different or better way to perform a task. I've had the opportunity to work on several different real-world Silverlight Line of Business (LOB) applications over the past few years and wanted to put together a list of some of the key things I've learned as well as key problems I've encountered and resolved. There are several different topics I could cover related to "lessons learned" (some of them were more painful than others) but I'll keep it to 5 items for this post and cover additional lessons learned in the future. The topics discussed were put together for a TechEd talk: Pick a Pattern and Stick To It Data Binding and Nested Controls Notify Users of Successes (and failures) Get an Agent – A Service Agent Extend Existing Controls The first topic covered relates to architecture best practices and how the MVVM pattern can save you time in the long run. When I was first introduced to MVVM I thought it was a lot of work for very little payoff. I've since learned (the hard way in some cases) that my initial impressions were dead wrong and that my criticisms of the pattern were generally caused by doing things the wrong way. In addition to MVVM pros the slides and sample app below also jump into data binding tricks in nested control scenarios and discuss how animations and media can be used to enhance LOB applications in subtle ways. Finally, a discussion of creating a re-usable service agent to interact with backend services is discussed as well as how existing controls make good candidates for customization. I tried to keep the samples simple while still covering the topics as much as possible so if you’re new to Silverlight you should definitely be able to follow along with a little study and practice. I’d recommend starting with the SilverlightDemos.View project, moving to the SilverlightDemos.ViewModels project and then going to the SilverlightDemos.ServiceAgents project. All of the backend “Model” code can be found in the SilverlightDemos.Web project. Custom controls used in the app can be found in the SivlerlightDemos.Controls project.   Sample Code and Slides

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  • The World of ‘Game of Thrones’ in Minecraft [Image Gallery]

    - by Asian Angel
    Are you a serious ‘Game of Thrones’ fan? Then prepare for a visual feast with this gallery of images showing a recreation of the world of Westeros in Minecraft. Here is another visual teaser from this awesome gallery… WesterosCraft Gallery (Imgur) [via Neatorama] How to Play Classic Arcade Games On Your PC How to Use an Xbox 360 Controller On Your Windows PC Download the Official How-To Geek Trivia App for Windows 8

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