The Mediator pattern

- [Instructor] The Mediator pattern is another one … of these patterns that we see used in a couple places … in the Spring Framework, but we don't use … that often when we write code. … In the Spring Framework, the single most important … place that we see the Mediator pattern used is … in the DispatcherServlet and the way … that it operates in Spring MVC. … Now, often it can also be used … when setting the state of various components at once, … and that's another time that we see … that used throughout the Framework … because when they have to do this, … these are all hidden kind of underneath the covers. … So how does this pattern actually work? … So, the Mediator provides encapsulation … on object behavior. … Communication channels flow through the Mediator, … who then, in turn, allow its mediated classes … to do work. … Mediated classes do not communicate with each other … and that's really the key of this pattern. … They only communicate with the Mediator. … And the Mediator classes themselves …