Design Patterns Quick Reference So every time I am designing something new I find myself either searching Google or opening up a gang of four (GoF) book to aid me. I searched for a bit trying to find a handy-dandy flash card showing class diagrams and purposes for the basic GoF patterns but was unable to locate a good one (for free). So I made my own.If you see any mistakes or improvements please post here and I will update the docs. If you find this useful, please consider making a donation, even if it is just a few dollars. There are multiple formats you can download in: PDF Cards: Get it! Poster: Get it! Page 1: Page 2: Enjoy!
Model View ViewModel MVVM facilitates a clear separation of the development of the graphical user interface (either as markup language or GUI code) from the development of the business logic or back end logic known as the model (also known as the data model to distinguish it from the view model). The view model of MVVM is a value converter[4] meaning that the view model is responsible for exposing the data objects from the model in such a way that those objects are easily managed and consumed. In this respect, the view model is more model than view, and handles most if not all of the view’s display logic (though the demarcation between what functions are handled by which layer is a subject of ongoing discussion[5] and exploration). The view model may also implement a mediator pattern organising access to the backend logic around the set of use cases supported by the view. History[edit] Microsoft MVP Josh Smith reported[6] that A notable Javascript implementation of this pattern is Knockout.js. Timeline[edit]
Presentation Model Represent the state and behavior of the presentation independently of the GUI controls used in the interface Also Known As: Application Model GUIs consist of widgets that contain the state of the GUI screen. Presentation Model pulls the state and behavior of the view out into a model class that is part of the presentation. Presentation Model may interact with several domain objects, but Presentation Model is not a GUI friendly facade to a specific domain object. Presentation Model is known to users of Visual Works Smalltalk as Application Model How it Works The essence of a Presentation Model is of a fully self-contained class that represents all the data and behavior of the UI window, but without any of the controls used to render that UI on the screen. To do this the Presentation Model will have data fields for all the dynamic information of the view. Figure 1: Classes showing structure relevant to clicking the classical check box When to use it Figure 3: The album window.
Welcome to Core J2EE Patterns! Oracle Technology Network > Java Software Downloads View All Downloads Top Downloads New Downloads What's New Java in the Cloud: Rapidly develop and deploy Java business applications in the cloud. Essential Links Developer Spotlight Java EE—the Most Lightweight Enterprise Framework? Blogs Technologies Contact Us About Oracle Cloud Events Top Actions News Key Topics Oracle Integrated Cloud Applications & Platform Services
Code Metrics, Code Smells, and Refactoring in Practice - The Cod Introduction Our team uses eXtreme programming practices to manage development on a mission critical system for a large retail chain. We have not adopted all the practices, but use the majority of the practices. Here is a list of the practices we use: Test-Driven Development (VSTS Testing Tools) Collective Code Ownership Coding Standards (FxCop, Code Metrics) Continuous Integration (daily builds, but we are looking to implement a CI environment soon) Planning Game (iteration planning and daily standup meetings) Customer Test (Fit, VSTS Web Tests) Small Releases (fortnightly UAT releases) Every morning at the standup meeting, the team lead will report on the nightly integration build. This report includes the following metrics: Unit tests passed, failed, ignored Fit test passed, failed, ignored, exceptions Test coverage (should be more than 80%) Cyclomatic complexity (should be less than 10) Code instructions (should be less than a 100) FxCop rule validations Background Here is the method:
Bad code smells - A Taxonomy Citation If you wish to cite this taxonomy please use the following article Mäntylä, M. V. and Lassenius, C. "Subjective Evaluation of Software Evolvability Using Code Smells: An Empirical Study". Journal of Empirical Software Engineering, vol. 11, no. 3, 2006, pp. 395-431. Taxonomy The reason for creating the taxonomy is to provide better understanding of the smells and to recognize the relationships between smells. In what way is this taxonomy better than the one provided in the Refactoring Workbook (Wake 2003)? Hey, I could argue that all smells should be placed inside a certain group (Change Preventers or OO abusers) since they all prevent change / abuse OO principles. I want to learn more about refactoring and code smellsTry (Fowler 2000) or www.refactoring.com I need to find a really good agile process framework to help our process improvement! References M. M. W. W.C. comments / feedback: Mika Mäntylä
Gestural Control: The Good, the Bad, and the Ugly Excerpts from my essay, published for my "Influencer" column on LinkedIn I await the day when gestures become standardized. When systems combine the best of all worlds: gestures, voice, and menus, keyboards, and pointing devices. But before we can do this, we have a simple task to do: reform the patent system. Gestural control of our consumer electronics is now commonplace. The Good There are lots of good things about gestures. The Bad Yes gestures are fun. gestures are the new form of command-line interfaces. The Ugly It is war time folks, patent wars, that is. ... companies are rushing to patent gestures. The Future ... every method of controlling devices has strengths and weaknesses Good old-fashioned levers, knobs, and buttons are often the best way to control physical devices. I await the day when gestures become standardized.
Code Smells Four Free Architecture Courses Learning doesn’t necessarily need to be formal – or expensive for that matter. Thanks to the Internet and some generous benefactors, you can further your education for free from the comfort of your own home. Top schools such as MIT and Harvard University are affiliated with free online learning resources, allowing people from all over the globe to connect and audit courses at their own pace. In some cases, these services even provide self-educators with proof for having completed courses. MIT OpenCourseWare: Architecture In 2003, MIT officially launched OpenCourseWare – an online platform through which absolutely anyone can access the same course content as paying students – for free. Architectural Construction and Computation is for students interested in how computers can facilitate design and construction. Delft University of Technology OpenCourseWare Just like MIT, TU Delft also has an OpenCourseWare platform – albeit less extensive. EdX: Architecture Open Online Academy
Architecture of Africa The architecture of Africa, like other aspects of the culture of Africa, is exceptionally diverse. Many ethno-linguistic groups throughout the history of Africa have had their own architectural traditions. In some cases, broader styles can be identified, such as the Sahelian architecture of an area of West Africa. One common theme in much traditional African architecture is the use of fractal scaling: small parts of the structure tend to look similar to larger parts, such as a circular village made of circular houses.[1] As with most architectural traditions elsewhere, African architecture has been subject to numerous external influences from the earliest periods for which evidence is available. African architecture uses a wide range of materials. Ten broad categories of vernacular hut and house structures have been identified: Early architecture[edit] North Africa[edit] Egypt[edit] Egypt's achievements in architecture were varied from temples, enclosed cities, canals, and dams. Nubia[edit]