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  • why write-enable ring

    - by SpashHit
    Here's an "interview question" that while ostensibly about hardware really does inform a software design principal as well. Computers used to (still do I guess, somewhere) use magnetic tape reels to store data. There was a plastic accessory you could attach to a tape reel called a "write-enable ring". If the tape had such a ring, the tape drive allowed writing to the tape... if not, it only allowed read access. Why was the choice to design the system in this way? Why not have a "write protect ring" instead, with the opposite effect?

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  • Starting new project with TDD

    - by Carol
    I'm studying TDD and I read that it also helps you to define the design of the app, correct? So I decided to start creating a new project to help me understand it better. I want to create a simple user registration system that will ask for its name, email address, country (will pick one from a list) and phone number. So the question is... I created a new solution in VS 2010, added a new Test project and I just don't know what tests to write! Since it will help me define the design, what tests could I write here? Thanks for any help!

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  • A LEGO-Themed Take On the Movie Inception [Video]

    - by Jason Fitzpatrick
    This Inception-inspired short film combines LEGO and CGI to great effect. Courtesy of a Staffordshire University design team, the short is a result of roughly a thousand hours of design work spread between seven students to serve as their semester project in visual FX. It has everything you could want from Inception rendered in LEGO: folding landscapes, flying bricks, an a LEGO man or two even loses his head. [via Geeks Are Sexy] HTG Explains: What Is Windows RT and What Does It Mean To Me? HTG Explains: How Windows 8′s Secure Boot Feature Works & What It Means for Linux Hack Your Kindle for Easy Font Customization

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  • Oracle OpenWorld Update -- Highly Available WebLogic Messaging Architectures: Sharing a Customer Experience with Comcast

    - by Ruma Sanyal
    This session will describe a Comcast’s hands-on  experience using WebLogic JMS as their high-performance enterprise messaging system including high availability, and disaster recovery capabilities as Comcast is rolling out a cross-site active-active message bus. In the session, we will cover the following: Key capabilities in WebLogic JMS that enabled Comcast to design such an architecture Details of the architecture put in place Details about application design needed to make all of this successful Failover and fail back processes The results from this new architecture are higher availability, better performance, more flexibility, and reduced costs through better utilization of hardware and improved manageability. For more information about this and other WebLogic sessions, review the Oracle WebLogic Focus On document here. Details: Tuesday, Oct 2, 5-6pm, Moscone South Room 306

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  • My architecture has a problem with views that required information from different objects. How can I solve this?

    - by Oscar
    I am building an architecture like this: These are my SW layers ______________ | | | Views | |______________| ______________ | | |Business Logic| |______________| ______________ | | | Repository | |______________| My views are going to generate my HTML to be sent to the user Business logic is where all the business logics are Repository is a layer to access the DB My idea is that the repository uses entities (that are basically the representation of the tables, in order to perform DB queries. The layers communicate between themselves using Business Objects, that are objects that represent the real-world-object itself. They can contain business rules and methods. The views build/use DTOs, they are basically objects that have the information required to be shown on the screen. They expect also this kind of object on actions and, before calling the business logic, they create BO. First question: what is your overall feeling about this architecture? I've used similar architecture for some projects and I always got this problem: If my view has this list to show : Student1, age, course, Date Enrolled, Already paid? It has information from different BO. How do you think one should build the structure? These were the alternatives I could think of: The view layer could call the methods to get the student, then the course it studies, then the payment information. This would cause a lot of DB accesses and my view would have the knowledge about how to act to generate this information. This just seems wrong for me. I could have an "adapter object", that has the required information (a class that would have a properties Student, Course and Payment). But I would required one adapter object for each similar case, this may get very bad for big projects. I still don't like them. Would you have ideas? How would you change the architecture to avoid this kind of problems? @Rory: I read the CQRS and I don't think this suits my needs. As taken from a link references in your link Before describing the details of CQRS we need to understand the two main driving forces behind it: collaboration and staleness That means: many different actors using the same object (collaboration) and once data has been shown to a user, that same data may have been changed by another actor – it is stale (staleness). My problem is that I want to show to the user information from different BO, so I would need to receive them from the service layer. How can my service layer assemble and deliver this information? Edit to @AndrewM: Yes, you understood it correctly, the original idea was to have the view layer to build the BOs, but you have a very nice point about the creation of the BO inside the business layers. Assuming I follow your advice and move the creation logic inside the business layer, my business layer interface would contain the DTOs, for instance public void foo(MyDTO object) But as far as I understand, the DTO is tightly coupled to each view, so it would not be reusable by a second view. In order to use it, the second view would need to build a specific DTO from a specific view or I would have to duplicate the code in the business layer. Is this correct or am I missing something?

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  • What do you look for when debugging deadlocks?

    - by Michael K
    Recently I've been working on projects that heavily use threading. I think that I'm OK at designing them; use stateless design as much as possible, lock access to all resources that more than one thread needs, etc. My experience in functional programming has helped that immensely. However, when reading other people's thread code, I get confused. I am debugging a deadlock right now, and since the coding style and design are different from my personal style, I am having a difficult time seeing potential deadlock conditions. What do you look for when debugging deadlocks?

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  • Free eBook: 45 Database Performance Tips for Developers

    As a developer, if you need to go into the database and write queries, design tables, or determine the configuration of your SQL Server Systems, these tips should help make sure you're not unnecessarily sacrificing database performance. This eBook has 45 easy tips to improve the performance of your indexes and T-SQL queries, and hunt down problems within ORM tools and database design. Save 45% on our top SQL Server database administration tools. Together they make up the SQL DBA Bundle, which supports your core tasks and helps your day run smoothly. Download a free trial now.

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  • Google I/O 2010 - Architecting GWT apps

    Google I/O 2010 - Architecting GWT apps Google I/O 2010 - Architecting GWT applications for production at Google GWT 301 Ray Ryan For large GWT applications, there's a lot you should think about early in the design of your project. GWT has a variety of technologies to help you, but putting it all together can be daunting. This session walks you through how teams at Google architect production-grade apps, from design to deployment, using GWT. For all I/O 2010 sessions, please go to code.google.com From: GoogleDevelopers Views: 8 1 ratings Time: 01:00:05 More in Science & Technology

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  • YouTube: Up & Running with Twitter Bootstrap

    - by Geertjan
    "Twitter Bootstrap is a free collection of tools for creating websites and web applications. It contains HTML and CSS-based design templates for typography, forms, buttons, navigation and other interface components, as well as optional JavaScript extensions. It is the most popular project on GitHub and has been used by NASA and MSNBC among others." (Wikipedia) Normally, when you read "getting started" instructions for Twitter Bootstrap, you're told to download various things from various sites. Then you're told to set up various folders and files, etc. What if it could be much simpler than that? Spend 7 minutes with me in this (silent) screencast and you'll see a complete development environment for developing applications with Twitter Bootstrap: Two things that could be added to the movie are the JavaScript debugger, the support for responsive design via switching between form factors in the embedded browser and Chrome with the NetBeans plugin, as well as how to convert the application to a native Android or iOS package via in-built Cordova support.

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  • Consultant in a firm that doesn't understand the tech!

    - by techsjs2012
    I got the job as a Consultant in a firm that has 3 other programmers. My job is to rewrite all the old system in Java, Spring etc but the staff programmers only know perl and the manager does not know any programming. I am trying to get them to understand that I have 6 projects to rewrite here but no one has design docs or spec. the staff programmers never had to write any documents. Plus I cant get the manager to understand the new java tech stuff.. he keeps asking some of the staff for views on things but the staff don't know it or understand it. Where do I go from here to make the manager understand that the staff programmers or someone has to write a design document so I know what to build. or if I have to write the documents how do I get the information?

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  • Where should people give feedback on Ubuntu?

    - by poolie
    Many people have opinions or want to give feedback about Ubuntu. If they are simple bugs with a crash or display corruption, that's fine, they can file in Launchpad. But, comments about the design or concept of the system are more problematic. They come up all over the place, such as "Some Unity feedback" in other places that are not really about Unity. Ideally the answer will be a place where the comments will actually be read by the design team will tend to encourage people to read the existing comments and not post the same thing again and again perhaps will tend to bubble up good solutions rather than strange ideas will not be annoying to people who are trying to use that place for something else

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  • Am I getting paid a reasonable wage for web engineering?

    - by sailtheworld
    I've been doing some research and it looks like most people in my line of work - WEB ENGINEERING/WEB APPLICATION DEVELOPMENT - that get paid hourly, make anywhere from $30-80 an hour for their work. With that said, I have SEVEN years of experience with web development including OOP-PHP, MySQL, jQuery, OOP-JS, interface design, ajax, database architecture, etc. I am also very strong with visual design and workflow - thus, I've made some really high quality interactive interfaces. I also have a lot of experience with Zend Framework, Symfony, Wordpress, Drupal, etc and a really strong portfolio to show for it. Here's the catch: I'm 20 years old, haven't graduated from college yet (I'm doing part time school and ~30 hours a week of web development.) But I've literally been doing web apps since I was 13 years old. So my question is: is $14 an hour a reasonable starting wage for working at a company part time?

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  • Oredev 2012: Summary and source code

    - by Laurent Bugnion
    This week, I had the pleasure to be invited to talk at Oredev, a really cool conference taking place in Malmo, Sweden. The whole event is awesome, including a very special dinner on Monday including sauna and swimming in a 6 degrees cold Baltic sea, and a reception with dinner at the town hall, including the mayor himself. Considering Malmo is a town of 300'000 inhabitants, it is a pretty nice occasion and the historical building itself is really worth seeing. For those interested, I placed my pictures on my Flickr account. I had a workshop on Tuesday morning about Windows 8 development with XAML/C#, and then a session on Wednesday about MVVM in Windows Phone 8 and Windows 8, of course using MVVM Light. I was very nervous because I reworked some of my demos as recently as this morning, in the wake of the Build conference last week and the release of both the Windows Phone SDK and MVVM Light V4.1. Everything went well however, and if I judge by the people I talked t after the talk, and Twitter, everything went pretty well. Before my talk on Tuesday, I had the pleasure to see a talk by Iris Classon (@irisclasson) on the challenges of being a "n00b" and a woman in software development. I especially appreciated her research and conclusions on the lack of women I our industry, a topic that is dear to my heart (because I want the best possible future for my two daughters, and also because I really enjoy working with women on projects, and getting a different insight on the art of software development. I really want to thank the excellent organization committee for their hard work and their fantastic welcome to Malmo. In particular Emily Holweck did a wonderful job and was super helpful throughout the preparation and the conference itself. I made a few pictures during my stay, all with the new Nokia Lumia 920, and hope you will enjoy them too. The source code and the slides… The source code is available for download from Skydrive. You will find the following: Windows 8 workshop slides. MVVM Applied slides Source code package with Win8Demo: The demo I built during the 4 hours workshop, with some light MVVM, web services (JSON), GridView, Design time data (Blend / Visual Studio designer), Bing maps integration, location sensor, Search pane integration. SemanticZoomSample: a sample I put together to demonstrate the SemanticZoom control, with two GridViews and of course full design time data for Blend work. Due to time constraints, I was not able to show this demo during the workshop, but I publish it anyway, hoping it will be useful to someone. PictureUploader: The demo I built during my 50 minutes session about MVVM Applied in Windows Phone 8 and Windows 8. Code sharing, design time data, MVVM Light are used in Windows Phone 8 and Windows 8 apps. And in video… You can also see the video of my MVVM talk thanks to the good services of the Oredev team! MVVM Applied in Windows Phone and Windows 8 from Øredev Conference on Vimeo.   Laurent Bugnion (GalaSoft) Subscribe | Twitter | Facebook | Flickr | LinkedIn

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  • Programming to ANSI standards (for engineering)

    - by Jake
    I am currently tasked to write a software to help engineers design standard compliant designs. If there is a bad design, software will report an error or warning. Maybe it's just me, but anyone who has done this should be familiar with the massive amounts of ANSI standards tables like this one: http://en.wikipedia.org/wiki/Nominal_Pipe_Size Computers are, as its name suggest, computing machines, not lookup machines. I feel that feeding formulas into computers and churning out standard compliant designs is much more efficient than doing memory intensive data lookups that are prone to human input errors and susceptible to "data updates". I actually think that there are formulas to calculate all those numbers, but nobody so far could give me that information. Anyone been through this before? What is THE best approach to this? Thanks for sharing.

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  • The ETL from Hell - Diagnosing Batch System Performance Issues

    Too often, the batch systems that underlie a lot of database processing just grow without conscious design. When runs start to extend beyond their allotted time, and tuning no longer solves the problem, it is often discovered that batches are run in series, with draconian error handling. It is time to impose some rational design, and Nigel is a seasoned healer of batch processes. The seven tools in the SQL DBA Bundle support your core SQL Server database administration tasks.Make backups a breeze! Enjoy trouble-free troubleshooting! Make the most of monitoring! Download a free trial now.

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  • Content Optimization only?

    - by danie7L T
    There are tons of discussions around tips&tricks to improve Search Engines "ranking" and SEOs. What if the focus of the webmaster/client is 100% set on the quality of the content with precise keywords in meta tags, clean design, regular articles updates, clean URLs and highly filtered external links leading to pages on websites dealing on the same,or related subjects; isn't it the job of a good search engine like Google to catch this website and show it in its front-page ? Or does Search Engines count on us to help them find us, and webmasters will always have to be up-to-date regarding SEO tools and rules updates on top of websites' design, browsers customization, progressive enhancement etc ?

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  • Why a write-enable ring?

    - by SpashHit
    Here's an "interview question" that while ostensibly about hardware really does inform a software design principal as well. Computers used to (still do I guess, somewhere) use magnetic tape reels to store data. There was a plastic accessory you could attach to a tape reel called a "write-enable ring". If the tape had such a ring, the tape drive allowed writing to the tape... if not, it only allowed read access. Why was the choice to design the system in this way? Why not have a "write protect ring" instead, with the opposite effect?

    Read the article

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