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• What Design Pattern To Replace 'CurrentStep' Variable

  - by Rob P.

  Tried to search but didn't know how to phrase it. I've got some code that is essentially... Private CurMajorStep as Integer = 0 Private CurMinorStep as Integer = 0 Public Sub PerformNextStep() Select Case iMajorStep Case 0 ThingOne() Case 1 ThingTwo() Case 2 ThingThree() Case 3 ThingFour() Case 4 AnythingElse() Case 5 Finish() End Select End Sub And then, in some of those, the CurMinorStep keeps track of the current state of that particular 'step'. I hope that all makes sense. The code is messy and I know it's going to be problematic to maintain. Can someone point me to a clean OO pattern to handle this?

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• Data access layer design

  - by Sam

  I have a web app and a console application accessing a db. The db has 2 tables (A, B) one of which (A) is specific to the web app. When writing a data access layer, what is the best way to do it? Technically data access layer should provide access to all the data accessible. In doing so, methods to interact with A are exposed to the console application if we have single access layer. Does creating 2 access layers to 2 table in the same database makes any sense? What is a good way to do it?

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• C++: How to design a utility class?

  - by Martijn Courteaux

  Hi, The title says it all. But I don't know if I should go for static methods, just a header, a class, or something else? What would be best practice? But, I don't want to have an instance of a utility class. I want to add functions like: Uint32 MapRGB (int r, int g, int b); const char* CopyString(const char* char); // etc. You know: utility methods...

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• Database Design Question

  - by Soo

  Ok SO, I have a user table and want to define groups of users together. The best solution I have for this is to create three database tables as follows: UserTable user_id user_name UserGroupLink group_id member_id GroupInfo group_id group_name This method keeps the member and group information separate. This is just my way of thinking. Is there a better way to do this? Also, what is a good naming convention for tables that link two other tables?

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• Why represent shopping carts and order invoices differently in a domain model?

  - by Todd

  I've built some shopping cart systems in the past, but I always designed them such that the final order invoice is just a shopping cart that has been marked as "purchased". All the logic for adding/removing/changing items in a cart is also the logic for the order. All data is stored in the same tables in the database. But it seems this is not the proper way to design an e-commerce site.. Can someone explain the benefit of separating the shopping cart from invoices in the domain model? It seems to me this would lead to a lot of duplicated code, an extra set of tables in the database, and make it harder to maintain in the event the system need to start accommodating more complicated orders (like specifying selected options for an item which may or may not change the price/availability/shipping time of the order). I'm assuming I just haven't seen the light, as every book and other example I see seems to separate these two seemingly similar concerns -- but I can't find any explanation as to the benefit of doing such! It's also the case in the systems that I design that changes are often made after the initial order is confirmed. It's not uncommon for items to be removed, replaced, or added afterwards (but prior to fulfillment).

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• How should I handle expected errors? eg. "username already exists"

  - by Pheter

  I am struggling to understand how I should design the error handling parts of my code. I recently asked a similar question about how I should go about returning server error codes to the user, eg. 404 errors. I learnt that I should handle the error from within the current part of the application; seem's simple enough. However, what should I do when I can't handle the error from the current link in the chain? For example, I may have a class that is used to manage authentication. One of it's methods could be createUser($username, $password). Within that function, I need to determine if the username already exists. If this is true, how should I alert the calling code about this? Returning null instead of a user object is one way. But how do I then know what caused the error? How should I handle errors in such a way that calling code can easily find out what caused the error? Is there a design pattern commonly used for this kind of situation?

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• What's the "correct way" to organize this project?

  - by user571747

  I'm working on a project that allows multiple users to submit large data files and perform operations on them. The "backend" which performs these operations is written in Perl while the "frontend" uses PHP to load HTML template files and determines which content to deliver. Data is stored in a database (MySQL, SQLite, Oracle) and while there is data which has not yet been acted upon, Perl adds it to a running queue which delivers data to other threads based on system load. In addition, there may be pre- and post-processing of the data before and after the main Perl script operates (the specifications are unclear) so I may want to allow these processors to be user-selectable plugins. I had been writing this project in a more procedural fashion but I am quickly realizing the benefit of separating concerns as to limit the scope one change has on the rest of the project. I'm quite unexperienced with design patterns and am curious what the best way to proceed is. I've heard MVC thrown around quite a bit but I am unsure of how to apply it. Specifically, what are some good options to structure this code (in terms of design patterns and folder hierarchy)? How can I achieve this with both PHP and Perl while minimizing duplicated code between languages? Should I keep my PHP files in the top level so I don't have ugly paths in the URL? Also, if I want to provide interchangeable databases, does each table need its own DAO implementation?

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• Google I/O 2010 - Google Wave API design principles

  Google I/O 2010 - Google Wave API design principles Google I/O 2010 - Google Wave API design principles + anatomy of a great extension Wave 201 Pamela Fox, Michael Goderbauer (Hasso Plattner Institute) Google Wave is all about collaboration. The most successful extensions are user-friendly and collaborative. Wave robots should be as intuitive to communicate with as a human, and play well with other robots; Wave gadgets should extend the metaphors of the textual collaboration into the visual. In this talk, we'll discuss the design and privacy principles you should consider while building extensions, and show examples of extensions that demonstrate these principles. For all I/O 2010 sessions, please go to code.google.com/events/io/2010/sessions.html From: GoogleDevelopers Views: 6 0 ratings Time: 01:01:54 More in Science & Technology

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• Fluid VS Responsive Website Development Questions

  - by Aditya P

  As I understand these form the basis for targeting a wide array of devices based on the browser size, given it would be a time consuming to generate different layouts targeting different/specific devices and their resolutions. Questions: Firstly right to the jargon, is there any actual difference between the two or do they mean the same? Is it safe to classify the current development mainly a html5/css3 based one? What popular frameworks are available to easily implement this? What testing methods used in this regard? What are the most common compatibility issues in terms of different browser types? I understand there are methods like this http://css-tricks.com/resolution-specific-stylesheets/ which does this come under?. Are there any external browser detection methods besides the API calls specific to the browser that are employed in this regard? Points of interest [Prior Research before asking these questions] Why shouldn't "responsive" web design be a consideration? Responsive Web Design Tips, Best Practices and Dynamic Image Scaling Techniques A recent list of tutorials 30 Responsive Web Design and Development Tutorials by Eric Shafer on May 14, 2012 Update Ive been reading that the basic point of designing content for different layouts to facilitate a responsive web design is to present the most relevant information. now obviously between the smallest screen width and the highest we are missing out on design elements. I gather from here http://flashsolver.com/2012/03/24/5-top-commercial-responsive-web-designs/ The top of the line design layouts (widths) are desktop layout (980px) tablet layout (768px) smartphone layout – landscape (480px) smartphone layout – portrait (320px) Also we have a popular responsive website testing site http://resizemybrowser.com/ which lists different screen resolutions. I've also come across this while trying to find out the optimal highest layout size to account for http://stackoverflow.com/questions/10538599/default-web-page-width-1024px-or-980px which brings to light seemingly that 1366x768 is a popular web resolution. Is it safe to assume that just accounting for proper scaling from width 980px onwards to the maximum size would be sufficient to accommodate this? given we aren't presenting any new information for the new size. Does it make sense to have additional information ( which conflicts with purpose of responsive web design) to utilize the top size and beyond?

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• cross resolution level design advice [on hold]

  - by Mike

  I was looking for some beginner advice regarding level design across multiple resolutions. I believe the answer is likely "it depends", but any input from anyone with real experience is very appreciated. Basically, I am building a 2D Super Metroid type game. If rooms/levels are to be a tiled grid, what are some general best practices for designing rooms when taking into account different resolutions? Since more or less tiles could fit vertically on a single screen depending on the resolution, is it better to design towards possibly having more of the room visible depending on the screen (with a bare minimum needed for gameplay), or should I fix the design at a certain tile height and scale the graphics?

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• Component-based design: handling objects interaction

  - by Milo

  I'm not sure how exactly objects do things to other objects in a component based design. Say I have an Obj class. I do: Obj obj; obj.add(new Position()); obj.add(new Physics()); How could I then have another object not only move the ball but have those physics applied. I'm not looking for implementation details but rather abstractly how objects communicate. In an entity based design, you might just have: obj1.emitForceOn(obj2,5.0,0.0,0.0); Any article or explanation to get a better grasp on a component driven design and how to do basic things would be really helpful.

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• Question about component based design: handling objects interaction

  - by Milo

  I'm not sure how exactly objects do things to other objects in a component based design. Say I have an Obj class. I do: Obj obj; obj.add(new Position()); obj.add(new Physics()); How could I then have another object not only move the ball but have those physics applied. I'm not looking for implementation details but rather abstractly how objects communicate. In an entity based design, you might just have: obj1.emitForceOn(obj2,5.0,0.0,0.0); Any article or explanation to get a better grasp on a component driven design and how to do basic things would be really helpful.

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• Google I/O 2012 - Advanced Design for Engineers

  Google I/O 2012 - Advanced Design for Engineers Alex Faaborg, Christian Robertson Design isn't black magic, it's a field that people can learn. In this talk two elite designers from Google will give you an advanced crash course in interactive and visual design. Topics will include mental models, natural mappings, metaphors, mode errors, visual hierarchies, typography and gestalt principles. Correctly applied this knowledge can drastically improve the quality of your work. For all I/O 2012 sessions, go to developers.google.com From: GoogleDevelopers Views: 158 9 ratings Time: 55:50 More in Science & Technology

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• Google I/O 2012 - Android Design for Success

  Google I/O 2012 - Android Design for Success Rachel Garb, Jens Nagel, Nate Streu, Matias Duarte You have a great idea for an Android app. You want it to stand out among hundreds of thousands. You want your users to love it and tell everyone they know. The Android User Experience team is here to help. We'll talk about the Android Design guide and other tricks of the trade for creating apps that delight users and help them accomplish their goals. No design background is required. For all I/O 2012 sessions, go to developers.google.com From: GoogleDevelopers Views: 46 5 ratings Time: 01:03:04 More in Science & Technology

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• Windows Phone 7 Design Template

  Windows Phone 7 Design Template Expression Blend is a wonderful design environment for WP7 (Windows Phone 7) but for quickly visualizing a concept nothing beats Illustrator! I am excited about WP7 and decided that having a solid .ai template would prove invaluable. Some of the details of the WP7 UI Design and Interaction Guide are a bit fuzzy (literally) but I was able to generate some useful layout guides, character styles, and symbols. While the template does not cover every aspect of the guide I think it is a good launching point; if you find it useful and extend it please share your updates (I created the template in CS4, if you have problems in earlier versions let me know).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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• Is PPC effective marketing Web Design & Development Services

  - by Pennf0lio

  Have anyone tried to do a PPC campaign on services like, Web Design Web Development Graphic Design Logo Design Programming as an individual and not a company? I've seen companies advertise web services, one popular i've seen is PSD2HTML. But I was if it is also applicable to individuals trying to market it self. If its applicable to, can you give some example how it is being maximize. Thank You! edit: I'd like to know if PPC campaign is effective on services mentioned above as an individual and not a company.

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• AdventueWorks Design Patterns Project - Part 1

  - by RonGarlit

  This is the presentation I did tonight at PHILLYNJ.NET.  It is the first in a multi-part of a series on the Applied Design Patterns.   The solution files are working code with design pattern notes in the comment blocks. After the overview and higher level discussions on Enterprise Design Patterns I reviewed the low level Database Access Library of code.  With walk-throughs of the the code and unint test. After that we went through the ProductPhotoConsoleTest Application that performed intergration testing of the DBAccess Class with the AdventureWorks ProductPhoto table extracting the photos and writing them to a file folder. The Demo code and PowerPoint can be obained from this link.  https://skydrive.live.com/?wa=wsignin1.0&cid=29e34e9a8650bb9e#!/?cid=29e34e9a8650bb9e&sc=documents&id=29E34E9A8650BB9E%21151 Please note that I use Visual Studio 2010 Ultimate.  If you have a lesser version the Modeling projects likely will not work or have limited functionality and you should unload that project to prevent warning. Enjoy! --Ron

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• software attribution / design credits

  - by Smith

  We just completed developing a web app for a client. And like i usually do, i added developed by "My Company" at the footer at a very small insignificat size. I sent the client an Eend user license stating some of the following in summary you can't resell, redistribute, etc without our notice ... you can remove the attribution or design credits the client got back to me and complained, telling me now that he was also developing for someone, and that 'I can't add my attribution' without his/her consent, but? Although i sign a NDA with in summary states that i cannot disclose the software to anyone else There was no agreement before the project that am not to add design credits or attribution i know every software i install have that, and so is every products from companies, mostly technological products. how does this work (adding design credits) What do you think?

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• Oracle Endeca User Interface Design Pattern Library Available

  - by ultan o'broin

  Yes! The Oracle Endeca User Interface Design Pattern Library is now available for all fans of great UI design solutions for search, discovery, and navigation! The patterns explain and show some great UI realizations and include consumer world examples we can relate to. Thanks to the Oracle Endeca team and Applications UX who worked closely together to bring this great user experience resource back out to customers and partners who want to build cutting edge apps, sites, and integrations. Some great insights into how these UI design patterns can bring magical information discovery and more to users, as well as what makes Endeca people tick, are available from the Usable Apps blog Oracle Endeca User Experience: From Putting the E in E-Commerce to Magical Information Discovery.

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• Any home design software similar to The Sims 3?

  - by Level1Coder

  I tried Sketchup to sketch a home design but I find the controls a bit frustrating. I can sketch 10 times faster in The Sims 3, plus it is nicer to look at. Though the metric system may not be 1:1 ratio to reality but it's close, maybe 15%-20% off but this is a just a sketch, right? Anyway, is there any software that does home design like The Sims 3? The same ease of use but at a more professional level and a real metric system?

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• Best way to handle global state

  - by David

  Hi there, I was wondering if anyone could offer some advice on 'best practices' for using global state in a web application - specifically PHP, although im looking for generic best practices i.e. design patterns etc. At the moment I just use a static class, calling it Configs. I suppose this is similar to using the registry pattern but surely there is a more elegant way of handling global data within an application - i just cant think of a better way though.

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• Sources of inspiration for navigation breadcrumbs

  - by Charles Roper

  I'm looking for sources of inspiration and/or design patterns for navigation 'breadcrumbs'. So far I have found the breadcrumb collection on Pattern Tap. Does anyone know of any other sources?

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• Could the cause of recent Toyota computing problems be an interface mismatch ?

  - by Spux

  Any ideas if the recent Toyota computing errors had something to do with the fact they where using an object orintated approach then took a data orientated approach thus causing user interface errors ? Studying programming languages with in interface robotic design and wondered if the car computing glitch Toyota has been having could have something to do with using a different programming approach with out reprogramming the whole system from scratch.

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• Any ideas if the recent Toyota computing errors had something to do with the fact they where using a

  - by Spux

  Studying programming languages with in interface robotic design and wondered if the car computing glitch Toyota has been having could have something to do with using a different programming approach with out reprogramming the whole system from scratch.

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• How does the Repository Pattern relate to the Business Logic Layer? [closed]

  - by Mustafa Dingil

  Should the Repository Pattern, as used in the context of Domain-driven design (DDD), be implemented within the business logic layer of an application? Or should it be part of the data access layer and just consumed by the business logic layer in turn?

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