Mediator pattern

Pattern definition

The mediator pattern defines an object that encapsulates how different objects interacts.

This ensures a low coupling between objects because none of them need to have a direct dependency on each other.

Mediator

Is an intermediary that controls the communication between Colleagues.

Colleagues

Represents an object or a component in an application. Each Colleague communicates only with the Mediator.

Client

Is an application component or object that needs to communicate with other part of the application. The client sends a message to the Mediator.

Note

In the Mediator pattern the Client is a Colleague.

Concrete Message Handler

Represents an object or a component in an application that receives a concrete message from the Mediator and processes it.

Note

In the Mediator pattern the Concrete Message Handler is a Colleague.