Performance Optimization:?
- For very large collections, optimizing the iterator to handle bulk operations
efficiently (e.g., lazy loading or batching) can improve performance.
Visual Diagram:
Follow:
+---------------------------+
| IIterator<T> |
| (Iterator Interface) |
+---------------------------+
+---------------------------+
| |
+-----------------+ +------------------+
| ProductIterator| | ProductCollection|
| (Concrete Iterator) | (Concrete Aggregate)|
+-----------------+ +------------------+
| |
+--------------+ +--------------+
| HasNext() | | Add() |
| Next() | | Count |
| | | CreateIterator() |
+--------------+ +--------------+
Conclusion:
The Iterator Pattern is a powerful design pattern for accessing elements of a collection
sequentially, encapsulating the iteration logic in a separate object. This allows for greater
flexibility and maintainability by decoupling the collection's internal representation from the
client code.
Mediator Pattern: Real-Time Example - Chat Application
Definition:
The Mediator Pattern defines an object that encapsulates how a set of objects interact. It
promotes loose coupling by preventing objects from referring to each other explicitly,
allowing them to communicate indirectly through the mediator. This pattern is useful when
you need to manage complex interactions between multiple objects, without them needing to
know about each other.
Use Case:
Follow:
A chat application is a perfect example of where the Mediator Pattern can be applied. In a
chat app, users (colleagues) need to communicate, but rather than each user being directly
aware of the others, a mediator handles all the communication between users.
Code Explanation: