Programming Design Patterns

If you are not familiar with the Gang of Four (GoF) patterns, there are many books and sites on the subject. These patterns are a set of logical designs that have been successful and provide a bit of arichtectural building blocks when considering the design of a framework or class library in .NET, Java, etc.  They are largely influenced by OO and Java especially. Although these patterns you can see in many frameworks of today.  These allow a communication of design so that understanding can be embedded into certain modules of a system.

Here is the list of (GoF site):

Creational Patterns
  Abstract Factory   Creates an instance of several families of classes
  Builder   Separates object construction from its representation
  Factory Method   Creates an instance of several derived classes
  Prototype   A fully initialized instance to be copied or cloned
  Singleton   A class of which only a single instance can exist
  Structural Patterns
  Adapter   Match interfaces of different classes
  Bridge   Separates an object’s interface from its implementation
  Composite   A tree structure of simple and composite objects
  Decorator   Add responsibilities to objects dynamically
  Facade   A single class that represents an entire subsystem
  Flyweight   A fine-grained instance used for efficient sharing
  Proxy   An object representing another object
  Behavioral Patterns
  Chain of Resp.   A way of passing a request between a chain of objects
  Command   Encapsulate a command request as an object
  Interpreter   A way to include language elements in a program
  Iterator   Sequentially access the elements of a collection
  Mediator   Defines simplified communication between classes
  Memento   Capture and restore an object’s internal state
  Observer   A way of notifying change to a number of classes
  State   Alter an object’s behavior when its state changes
  Strategy   Encapsulates an algorithm inside a class
  Template Method   Defer the exact steps of an algorithm to a subclass
  Visitor   Defines a new operation to a class without change

We will be writing samples of each pattern and real world usage.  In actuality patterns are great and will make you understand programming architecture.  However patters at times can be overkill and more deep than necessary and possibly cutting off junior level understanding.  The dofactory rates patterns and their frequency of usage or usability. I think that patterns are very important but also a low entry point into code libraries is very important.  Simple interfaces to the logical blocks like patterns is common in frameworks like the .NET framework or Java runtime.

One Response to “Programming Design Patterns”

  1. Un par sobre patrones de diseño Says:

    […] Programming Design Patterns […]

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