Editing Mediator pattern (section)

== Definition ==
The essence of the mediator pattern is to "define an object that encapsulates how a set of objects interact". It promotes loose coupling by keeping objects from referring to each other explicitly, and it allows their interaction to be varied independently.<ref>{{cite book |first1=Erich |last1=Gamma |author-link1=Erich Gamma |first2=Richard |last2=Helm |first3=Ralph |last3=Johnson |author-link3=Ralph Johnson (computer scientist) |first4=John |last4=Vlissides |author-link4=John Vlissides |title=[[Design Patterns]] |date= 1994 |publisher=[[Addison-Wesley]] |isbn=0-201-63361-2}}</ref><ref>{{cite web |url=http://sourcemaking.com/design_patterns/mediator |title=Mediator Design Pattern |website= SourceMaking}}</ref> Client classes can use the mediator to send messages to other clients, and can receive messages from other clients via an event on the mediator class.