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  • Applications: Colliding Marbles in C Sharp

    - by TechTwaddle
    If you follow this blog, you know how much I love marbles. I was staying up for Microsoft's "It's Time To Share" event and I thought I'll write up a C# version of Colliding Marbles. It's a pretty straight forward port from the native version, the only major difference being in the drawing primitives. Video follows. The solution was created using Visual Studio 2008 and the source code is shared below. Source Code: CollidingMarbles.zip [Shared on SkyDrive] Video,

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  • Is there a language or design pattern that allows the *removal* of object behavior or properties in a class hierarchy?

    - by Sebastien Diot
    A well-know shortcoming of traditional class hierarchies is that they are bad when it comes to model the real world. As an example, trying to represent animals species with classes. There are actually several problems when doing that, but one that I never saw a solution to is when a sub-class "looses" a behavior or properties that was defined in a super-class, like a penguin not being able to fly (there are probably better examples, but that's the first one that comes to my mind, having seen "Madagascar 2" recently). On the one hand, you don't want to define for every property and behavior some flag that specifies if it is at all present, and check it every time before accessing that behavior or property. You would just like to say that birds can fly, simply and clearly, in the Bird class. But then it would be nice if one could define "exceptions" afterward, without having to use some horrible hacks everywhere. This often happens when a system has been productive for a while. You suddenly find an "exception" that doesn't fit in the original design at all, and you don't want to change a large portion of your code to accommodate it. So, is there some language or design patterns that can cleanly handle this problem, without requiring major changes to the "super-class", and all the code that uses it? Even if a solution only handle a specific case, several solutions might together form a complete strategy. [EDIT] Forgot about the Liskov Substitution Principle. That is why you can't do it. Assuming you define "traits/interfaces" for all major "feature groups", you can freely implement traits in different branches of the hierarchy, like the Flying trait could be implemented by Birds, and some special kind of squirrels and fish. So my question could amount to "How could I un-implement a trait?" If your super-class is a Java Serializable, you have to be one too, even if there is no way for you to serialize your state, for example if you contained a "Socket". So one way to do it is to always define all your traits in pair from the start: Flying and NotFlying (which would throw UnsupportedOperationExceiption, if not checked against). The Not-trait would not define any new interface, and could be simply checked for. Sounds like a "cheap" solution, in particular if used from the start.

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  • Design patterns to avoiding breaking the SRP while performing heavy data logging

    - by Kazark
    A class that performs both computations and data logging seems to have at least two responsibilities. Given a system for which the specifications require heavy data logging, what kind of design patterns or architectural patterns can be used to avoid bloating all the classes with logging calls every time they compute something? The decorator pattern be used (e.g. Interpolator decorated to LoggingInterpolator), but it seems that would result in a situation hardly more desirable in which almost every major class would need to be decorated with logging.

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  • Replacement of Outlooksoft (SAP BPC) with Oracle EPM at Brady Corporation

    Nigel Youell, Product Marketing Director, Enterprise Performance Management Applications at Oracle discusses with Joe Bittorf, Project Manager at Brady Corporation why and how they embarked on this major project to replace SAP BPC with Oracle's Enterprise Performance Management Solution. Joe covers the outstanding improvements they have achieved in their financial close process, how they worked with Oracle Partner Emerging Solutions and the current project to further improve their planning and budgeting processes.

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  • Why We Should All Embrace IPTV

    IPTV technology is starting to change the way many people view video media. Offering some major advantages over traditional cable or satellite broadcast methods, IPTV streams its content from the int... [Author: John King - Computers and Internet - March 29, 2010]

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  • Need Help in Pointing to focus on the Key elements in Code Review Phase?

    - by Sankar Ganesh
    Hi Friends, Let us share your views on the Code Review process, If someone gave a code snippet and ask you to review that code, then what are the major things you will focus on that code Review process. For Instance: I will check any dead code is available in that code, other than Checking Dead Code, what are the key elements to be focused on CODE REVIEW PROCESS. Thanks For Sharing Your Views Sankar Ganesh.S

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  • Working with Legacy code #3 : Build a safety net.

    - by andrewstopford
    The first port of call in changing legacy code is a safety net, without one your fingers will get burnt. Make your safety net a high level functional test over the major areas of the application. Automate the test, plug it into your CI builds and run it every night. The test should act as a final fail safe as you work.

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  • Experiences with learning Chinese

    - by Greg Low
    I've had a few friends asking me about learning Chinese and what I've found works and doesn't work. I was answering a question on a mailing list today and I thought I should post this info where it might be useful to many. The question that was initially asked was whether Rosetta Stone was useful but I've provided much more info on learning the language here. I’ve used Rosetta Stone with Chinese but it’s really hard to know whether to recommend it or not. Rosetta Stone works the same way in all languages. They show you photos and then let you both see and hear the target language and get you to work out what they’re talking about. The thinking is that that’s how children learn. However, at first, I found it very frustrating. I’d be staring at photos trying to work out what they were really trying to get at. Sometimes it’s far from obvious. I could not have survived without Google Translate open at the same time. The other weird thing is that the photos are from a mixture of countries. While that’s good in a way, it also means that they are endlessly showing pictures of something that would never happen in the target language and culture. For any language, constant interaction with a speaker of the target language is needed. Rosetta Stone has a “Studio” option. That’s the best part of the program. In my case, it lets me connect around twice a week to a live online class from Beijing. Classes usually have the teacher plus two to four students. You get some Studio access with the initial packages but need to purchase it for ongoing use. I find it very inexpensive. It seems to work out to about $70 (AUD/USD) for six months. That’s a real bargain. The other downside to Rosetta Stone is that they tend to teach very formal language, but as with other languages, that’s not how the locals speak. It might have been correct at one point but no-one actually says that. As an example, Rosetta Stone teach Gonggòng qìche (pronounced roughly like “gong gong chee chure” for bus. Most of my friends from areas like Taiwan would just say Gongche. Google Translate says Zongxiàn (pronounced somewhat like “dzong sheean”) instead. Mind you, the Rosetta Stone option isn't really as bad as "omnibus"; it's more like saying "public bus". If you say the option they provide, people would understand you. I also listen to ChinesePod in the car. They also have SpanishPod. Each podcast is about five minutes of spoken conversation. It is very good for providing current language. Another resource I use is local Meetup groups. Most cities have these and for a variety of languages. It’s way less structured (just standard conversation) but good for getting interaction. The obvious challenge for Asian languages is reading/writing. The input editors for Chinese that are part of Windows are excellent. Many of my Chinese friends speak fluently but cannot read or write. I was determined to learn to do both. For writing, I’m talking about on a computer, not with a pen. (Mind you, I can barely write English with a pen nowadays). When using Rosetta Stone, you can choose to have the Chinese words displayed in pinyin (Wo xihuan xuéxí zhongguó) or in Chinese characters (???????) or both. This year, I’ve been forcing myself to just use the Chinese characters. I use a pinyin input editor in Windows though, as it’s very fast.  (The character recognition input in the iPad is also amazing). Notice from the example that I provided above that the pronunciation of the pinyin isn’t that obvious to us at first either.  Since changing to only using characters, I find I can now read many more Chinese characters fluently. It’s a major challenge though. I can read about 300 now and yet you need around 2,500 to be able to read a newspaper fairly well. Tones are a major issue for some Asian languages. Mandarin has four tones (plus a neutral tone) and there is a major difference in meaning between two words that are spelled the same in pinyin but with different tones. For example, Ma (3rd tone?) is a horse, Ma (1st tone?) is like “mom”, and ma (neutral tone?) is a question mark and so on. Clearly you don’t want to mix these up. As in English, they also have words that do sound the same but mean different things in different contexts. What’s interesting is that even though we see two words that differ only by tone as very similar, to a native speaker, if you say the right words with the wrong tone, you might as well have said a completely different word. My wife’s dialect of Chinese has eight tones. It’s much worse. The reason I’m so keen to learn to read/write Chinese is that even though the different dialects are pronounced so differently that speakers of one dialect often cannot understand another dialect, the writing is generally the same. The only difference is that many years ago, the Chinese government created a simplified set of characters for some of the most commonly used ones. Older Chinese and most Cantonese speakers often struggle with the simplified characters. This is the simplified form of “three apples”: ????   This is the traditional form of the same words: ????  Note that two of the characters are the same but the middle two are quite different. For most languages, the best thing is to watch current movies in the target language but to watch them with the target language as subtitles, not your native language. You want to know what they actually said, not what it roughly means (which is what the English subtitle would give you). The difficulty with Asian languages like Chinese is that you have the added challenge of understanding the subtitles when they are written in the target language. I wish there were Mandarin Chinese movies with pinyin subtitles. For learning to read characters, I also recommend HanCard on the iPad. It is targeted at the HSK language proficiency levels. (I’m intending to take the first HSK exam as soon as I’m ready). Hope that info helps someone get started.  

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  • New study shows supply chain cost management increased from 6.0% to 6.9%

    - by John Murphy
    A global survey of supply chain managers indicates that aggressively managing costs and creating a flexible supply chain are major factors for businesses in successfully growing market share as the economy rebounds. Results also show supply chain managers are investing in systems and developing partnerships that enable greater visibility with their supply chain partners. http://www.mhia.org/news/industry/11429/flexible-supply-chains-drive-growth-in-revenue-and-profit

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  • Showplan Operator of the Week - Concatenation

    Fabiano continues in his mission to describe, one week at a time, all the major Showplan Operators used by SQL Server's Query Optimiser to build the Query Plan. This week he gets the Concatenation operator ....Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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  • Places to Get Free SEO Links

    SEO links will increase your overall page rank with Google and improve your placement in all of the major search engines. Building up quality SEO links also helps to build up your link popularity and thus your website traffic should begin to improve.

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  • Marketing: Angry Birds - How it's done

    - by John
    Why do some apps, like Angry Birds, dominate the market while other cool/fun/addicting apps are never heard of? I'm trying to figure out the best marketing strategy, or best way to sell an app to mass market. Does anybody have any ideas or things they noticed about the marketing of major blockbuster apps, like Angry Birds, why they get so popular and stay at the top of charts. Thanks for any ideas, comments ...

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  • Help needed on a UI/Developer Interview

    - by AJ Seth
    I have a phone interview with a major Internet company and it is a mostly front-end developer position. If anyone has experience with UI/developer interviews and can give some advice/questions asked etc. that'll be great. Additionally, what resources can be read and reviewed for the following: Designing for performance, scalability and availability Internet and OS security fundamentals EDIT: Now I am told that the interview I am told will be mostly on coding, Data Structures, design questions etc. Anyone?

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  • What email providers are case sensitive? [on hold]

    - by Thanatos
    According to RFC 5321, the local-part of email addresses is case-sensitive. However, most providers that I know of (e.g., GMail) are not case-sensitive. (It's actually more complex than that: GMail ignores .s in emails as well.) Is there a list, or source, of the various rules, including case-sensitivity, for various major email providers? Is there a large-ish email provider than has case-sensitive email addresses?

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  • Protect and Improve your Software with SmartAssembly 5

    - by Bart Read
    SmartAssembly 5 has been released. You can download a 14-day fully-functional free trial from: http://www.red-gate.com/products/smartassembly/index.htm This is the first major release since Red Gate acquired the tool last year, and our focus has mainly been on improving the quality of an already great tool. We've also simplified the licensing model so that there are now only three editions: Standard - bullet-proof protection at a bargain price, Pro - includes the SDK & custom web server...(read more)

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  • Oracle OpenWorld 2012 - What's New

    - by Cinzia Mascanzoni
    Oracle OpenWorld 2012 is now over. Here a summary of major announcements on Hardware and Technology. Oracle Unveils Expanded Oracle Cloud Services Portfolio Oracle Unveils New Partner Cloud Programs Oracle Announces Latest Release of Oracle Exalogic Elastic Cloud Oracle Announces Oracle Exadata X3 Database In-Memory Machine Oracle Outlines Opportunity to Transform Industries from Device to Data Center with Embedded Java Oracle Announces Oracle Solaris 11.1 Latest Release of Oracle Exalytics In-Memory Machine Software Enables Customers to View and Analyze Data at the Speed of Business New Release of Oracle Business Intelligence Enables Users to Quickly Access and Analyze Key Business Information, Anytime, Anywhere

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