Increased Dependencies:?
- While the mediator reduces direct dependencies between colleagues, it can
also create a dependency on the mediator itself. Over-reliance on the
mediator can lead to issues if the mediator needs to change.
Visual Diagram:
+----------------------+
| IChatMediator |
| (Mediator Interface) |
+----------------------+
+------------------------------------+
| |
+------------------+ +------------------+
| ChatMediator | | User |
| (Concrete Mediator) | (Colleague) |
+------------------+ +------------------+
| |
+-------------------+ +------------------+
| RegisterUser(User)| | Send(string) |
| SendMessage(...) | | Receive(string) |
+-------------------+ +------------------+
Follow:
Conclusion:
The Mediator Pattern is an excellent solution for managing complex interactions between
objects in a system, particularly when those objects don’t need to know about each other
directly. It reduces dependencies, simplifies communication, and centralizes control, making
it easier to manage interactions. However, it should be used judiciously, as a poorly
implemented mediator can become a bottleneck or a single point of failure in the system.
Memento Pattern: Real-Time Example - Undo Feature in a Text Editor
Definition:
The Memento Pattern is used to capture and externalize an object's internal state without
violating encapsulation. This allows the object to be restored to this state later. It’s commonly
used in situations where an object's state changes over time and you may need to revert to
previous states, such as an undo feature.
Use Case:
The Memento Pattern is widely used in scenarios where you want to implement an undo or
restore functionality, such as in a text editor. In this case, the pattern allows the editor to
save versions of the text and restore them when the user requests an undo.
Code Breakdown: