Mediator Pattern

Mediator is a behavioral design pattern that lets you reduce chaotic dependencies between objects. The pattern restricts direct communications between the objects and forces them to collaborate only via a mediator object.

Tutorial: here.

Conceptual diagram:

Client code:

void main() {
  final component1 = Component1();
  final component2 = Component2();

  ConcreteMediator(component1, component2);

  component1.doOne();
  print('');
  component2.doTwo();
}

Output:

call Component1.doOne()
ConcreteMediator.notify(event: "doOne")
ConcreteMediator.reactComponentOne()
use component2.name = "Two"

call Component2.doTwo()
ConcreteMediator.notify(event: "doTwo")
ConcreteMediator.reactComponentTwo()
use component1.sate = "Cmp1"