Mediator Pattern

Summary

• The Mediator pattern enables objects to communicate without knowing each other's identities.
• The Mediator pattern is used in many modern systems that reflect a send/receive protocol.
• The Mediator pattern can have a performance impact on a system because all communication must go through the mediator and it can become a bottleneck.

Class diagram: (see Mediator Pattern code review)

Usage

Use the Mediator pattern when:

• Objects communicate in well-structured but potentially complex ways.
• The objects identities should be protected even though they communicate.
• Some object behaviours can be grouped and customized.