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Mediator Design Pattern Overview

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Purpose and Benefits: Mediator Pattern reduces dependencies between tightly coupled objects
All communication goes through a single mediator object
Promotes loose coupling and easier code reuse
Follows Single Responsibility and Open-Closed Principles
Implementation Structure: Mediator defines interface for Colleague objects to communicate
Colleague class holds single reference to Mediator
ConcreteMediator encapsulates interaction logic between Colleagues
Colleague objects communicate only through Mediator
Example Application: Cooling system example shows direct coupling between Fan, PowerSupplier, and Button
Mediator pattern separates components into single Mediator reference
Changes to system only require modifying Mediator logic
Pattern works well for loosely coupled, maintainable systems
When to Use: Suitable for systems with tightly coupled, hard-to-maintain objects
Should not be used when system design is faulty
Requires careful consideration before implementation