Mediator Pattern

1. Mediator Design Pattern
(Behavioral)
-Mr.Anuj B. Pawar.
Roll No. 51

2. Intent
Mediator Pattern _ap2

 Object Behavioral an object that encapsulates how a
set of objects, which can interact and refer each other
independently.

3. Motivation
Mediator Pattern _ap3
Requirement of system –
A system needs objects to communicate with each other and
should be able to share properties of each other.
Desired system will have –
Different objects which can communicate with each other.
Problem –
Object structure will have many connections between objects
Every object ends up knowing about every other.

4. Applicability
Mediator Pattern _ap4
When one or more objects must interact with several different
objects.
When simple object need to communicate in complex ways.
When you want to reuse an object that frequently interacts with
other objects.

5. Example- Problem
Mediator Pattern _ap5

6. Example-Solution
03/04/03CS590L Mediator Pattern6

7. Example-Steps
Mediator Pattern _ap7
The list box tells its director that it’s changed.
The director gets the selection from the list box.
The director passes the selection to the entry field.
Director takes action.

8. General Structure
Mediator Pattern _ap8

9. Participants
Mediator Pattern _ap9
Mediator
-defines an interface for communicating with Colleague
objects.
Concrete Mediator
-implements cooperative behavior by coordinating
Colleague objects.
-knows and maintains its colleagues.
Colleague classes
-each Colleague class knows its Mediator object.
-each colleague communicates with its mediator
whenever it would have otherwise communicated with
another colleague.

10. Related Patterns
Mediator Pattern _ap10
Façade
Observer

11. Mediator Pattern _ap11
Thank You..