Static Class Structure

• Mediator
  • Defines an interface for controlling and coordinating the interaction among colleagues.
• Mediator1,…
  • Implement the Mediator interface.
  • Maintain explicit references (colleague1,colleague2,…) to colleagues. 
• Colleague1,Colleague2,…
  • Refer to the Mediator interface instead of referring to each other directly.

Dynamic Object Collaboration

• In this sample scenario, a Mediator1 object mediates (controls and coordinates) the interaction between Colleague1 and Colleague2 objects (to synchronize their state, for example).
  Let's assume that Colleague1 and Colleague2 are configured with a Mediator1 object.
• Let's assume that the state of Colleague1 changes, which causes Colleague1 to call mediate(this) on its Mediator1 object.
• Colleague1 passes itself (this) to the Mediator1 so that Mediator1 can call back and get the changed data.
• The Mediator1 gets the changed data from Colleague1 and performs an action2() on Colleague2.
• Thereafter, assuming that the state of Colleague2 changes, Colleague2 calls mediate(this) on its Mediator1.
• The Mediator1 now gets the changed data from Colleague2 and performs an action1() on Colleague1.
• See also Sample Code / Example 1.