Mediator Design Pattern

 definition
 UML diagram
 participants
 sample code in C#



definition

Define an object that encapsulates how a set of objects interact. Mediator promotes loose coupling by keeping objects from referring to each other explicitly, and it lets you vary their interaction independently.

Frequency of use:   medium low

UML class diagram


participants

    The classes and/or objects participating in this pattern are:

  • Mediator  (IChatroom)
    • defines an interface for communicating with Colleague objects
  • ConcreteMediator  (Chatroom)
    • implements cooperative behavior by coordinating Colleague objects
    • knows and maintains its colleagues
  • Colleague classes  (Participant)
    • each Colleague class knows its Mediator object
    • each colleague communicates with its mediator whenever it would have otherwise communicated with another colleague

sample code in C#

This structural code demonstrates the Mediator pattern facilitating loosely coupled communication between different objects and object types. The mediator is a central hub through which all interaction must take place.

Show code

// Mediator pattern -- Structural example




This real-world code demonstrates the Mediator pattern facilitating loosely coupled communication between different Participants registering with a Chatroom. The Chatroom is the central hub through which all communication takes place. At this point only one-to-one communication is implemented in the Chatroom, but would be trivial to change to one-to-many.

Show code

// Mediator pattern -- Real World example




This .NET optimized code demonstrates the same real-world situation as above but uses modern, built-in .NET features, such as, generics, reflection, object initializers, automatic properties, etc.

Show code

// Mediator pattern -- .NET optimized




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.NET
Design Pattern
Framework 4.5


 
C# and VB.NET


   Includes:

  Gang of Four Patterns
  Head First Patterns
  Enterprise Patterns
  Multi-Tier Patterns

  Repository Pattern
  Unit-of-Work Pattern
  CQRS Pattern
  Active Record Pattern

  Model View Controller
  Model View Presenter
  Model View ViewModel

  SparkTM RAD Platform
  Art Shop MVC Application
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