With design patterns, there usually is no “more advantageous” solution that works for all cases. It depends on what you need to implement. From Wikipedia: Builder focuses on constructing a complex object step by step. Abstract Factory emphasizes a family of product objects (either simple or complex). Builder returns the product as a final step, … Read more
The documentation has already covered this. If you have any specific questions, feel free to edit your main post. Official: Page Objects and PageFactory on Selenuim Wiki. Page Object Design Pattern on Selenium official site. Unofficial: Do a Google search, you will get a lot info on this. Page Object Pattern Page Objects in Selenium … Read more
“Adapter makes things work after they’re designed; Bridge makes them work before they are. [GoF, p219]” Effectively, the Adapter pattern is useful when you have existing code, be it third party, or in-house, but out of your control, or otherwise not changeable to quite meet the interface you need it to. For instance, we have … Read more
I prefer to create an interface for setting query, loading, and saving. By using dependency injection, I can inject this into each component that requires it. This allows flexibility in terms of replacing the configuration strategy, and gives a common base for everything to work from. I prefer this to a single, global “settings loader” … Read more
Before understanding the Crosscutting Concern, we have to understand the Concern. A Concern is a term that refers to a part of the system divided on the basis of the functionality. There are two types of concerns: The concerns representing single and specific functionality for primary requirements are known as core concerns. OR Primary functionality … Read more
Fist of all: I believe that you are mixing up the MVC pattern and n-tier-based design principles. Using an MVC approach does not mean that you shouldn’t layer your application. It might help if you see MVC more like an extension of the presentation layer. If you put non-presentation code inside the MVC pattern you … Read more
http://sites.google.com/site/steveyegge2/singleton-considered-stupid Why is the Singleton so attractive? I’ll be the first to admit: I liked it too. No, scratch that – I loved the Singleton. It felt like an old friend from the moment I laid eyes on it. It was simple and beautiful. I’ll tell you why: it’s because the Singleton pattern is a … Read more
The Gang Of Four “Design Patterns; Elements of Reusable Object-Oriented Software” book contains two entries, “Abstract Factory” (aka ‘Virtual Constructor’) and “Factory Method”. I don’t know about “Concrete Factory.” I’ve heard the term, but never given it too much thought. Factory Method In “Factory Method” an object has a method which is responsible for the … Read more
UPDATE This answer contains wrong information about differences between proxy objects and partial objects. See @Kontrollfreak’s answer for more details: https://stackoverflow.com/a/17787070/252591 Proxy objects are used whenever your query doesn’t return all data required to create an entity. Imagine following scenario: @Entity class User { @Column protected $id; @Column protected $username; @Column protected $firstname; @Column protected … Read more
First and foremost, in most cases you don’t need to use builders in Kotlin because we have default and named arguments. This enables you to write class Car(val model: String? = null, val year: Int = 0) and use it like so: val car = Car(model = “X”) If you absolutely want to use builders, … Read more