What are Design Patterns?
Design patterns are solutions to known problems. The pattern represents an abstracted solution to a commonly experienced problem. As the solution is abstracted it is language [...]
Design Patterns
Java Enterprise Edition Design Patterns
This and subsequent posts are a write up of my Java EE revisits design patterns talk at jDay Sweden 2016. The slides to the presentation are viewable here: Java EE Revisits [...]
Design Patterns: The Beginning
The Beginning Where did they come from? Did they just appear overnight? In fact, design patterns have a long history starting way before computing. But it wasn’t really [...]
Singleton Pattern
OK let’s have a look at our first pattern. The singleton pattern is one of the most well-known design patterns and is used extensively by frameworks such as Spring, pool [...]
Factory Pattern
The factory pattern is a creational design pattern whose intent is to provide an interface for creating families of related or dependent objects without specifying their [...]
Façade Pattern
The simple definition is that it hides the complex logic and provides an interface to the client. Sounds familiar? This is nothing much more than the core part of [...]
Decorator Pattern
The decorator pattern is one of the GoF Structural Pattern and dynamically adds logic to an object. Instead of inheritance, the decorator adds functionality at run time. [...]
Observer Pattern
A little bit difficult to understand why it is needed in the first place and it goes down to the basic fundamental requirement of OO systems which is to pass a message from [...]
Java EE Revisits the Factory Pattern
The factory pattern is a creational design pattern whose intent is to provide an interface for creating families of related or dependent objects without specifying their [...]
Context Dependency Injection
The Java EE programming model has been simplified substantially since J2EE. Annotations have replaced the XML description files, convention over configuration have replaced [...]