Participants
Mediator - defines the interface for communication between Colleague objects
ConcreteMediator - implements the Mediator interface and coordinates communication between Colleague objects. It is aware of all the Colleagues and their purpose with regards to inter communication.
ConcreteColleague - communicates with other Colleagues through its Mediator
Read more about this topic: Mediator Pattern
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“A civilization which leaves so large a number of its participants unsatisfied and drives them into revolt neither has nor deserves the prospect of a lasting existence.”
—Sigmund Freud (1856–1939)