What is Mediator Pattern C?
The Mediator Pattern is a behavioral design pattern that allows objects to communicate with each other indirectly through a mediator object. This pattern is particularly useful when there are many dependencies between objects, and the interactions between them need to be managed efficiently. In C, the Mediator Pattern is implemented to reduce the complexity of communication between objects and to make the code more maintainable and scalable.
The Mediator Pattern works by defining a common interface for communication between objects, and then implementing this interface in a mediator class. The mediator class acts as a central point of communication, relaying messages between the objects that need to interact. This approach helps to decouple the objects from each other, as they no longer need to know about the existence of other objects.
How Mediator Pattern Works in C
In C, the Mediator Pattern can be implemented using interfaces and classes. Here’s a basic example of how it works:
1. Define a common interface for communication between objects:
“`csharp
public interface IMediator
{
void Notify(object sender, string message);
}
“`
2. Implement the mediator class that will relay messages between objects:
“`csharp
public class Mediator : IMediator
{
public void Notify(object sender, string message)
{
// Relaying the message to the appropriate object
// based on the sender and message content
}
}
“`
3. Create objects that will communicate through the mediator:
“`csharp
public class ColleagueA : IColleague
{
private IMediator mediator;
public ColleagueA(IMediator mediator)
{
this.mediator = mediator;
}
public void Send(string message)
{
mediator.Notify(this, message);
}
public void Receive(string message)
{
// Process the received message
}
}
public class ColleagueB : IColleague
{
private IMediator mediator;
public ColleagueB(IMediator mediator)
{
this.mediator = mediator;
}
public void Send(string message)
{
mediator.Notify(this, message);
}
public void Receive(string message)
{
// Process the received message
}
}
“`
4. Instantiate the mediator and the objects, and wire them together:
“`csharp
public class Program
{
public static void Main()
{
IMediator mediator = new Mediator();
IColleague colleagueA = new ColleagueA(mediator);
IColleague colleagueB = new ColleagueB(mediator);
colleagueA.Send(“Hello, Colleague B!”);
colleagueB.Receive(“Hello, Colleague B!”);
colleagueB.Send(“Hello, Colleague A!”);
colleagueA.Receive(“Hello, Colleague A!”);
}
}
“`
Advantages of Using Mediator Pattern in C
The Mediator Pattern offers several advantages when used in C applications:
1. Decoupling: The Mediator Pattern helps to decouple objects from each other, making the code more modular and easier to maintain.
2. Scalability: By centralizing communication, the Mediator Pattern makes it easier to add new objects and modify existing ones without affecting the rest of the system.
3. Flexibility: The Mediator Pattern allows for dynamic changes in communication patterns, as the mediator can be easily modified to handle different types of messages.
4. Maintainability: The Mediator Pattern reduces the complexity of managing object interactions, making the codebase easier to understand and maintain.
In conclusion, the Mediator Pattern in C is a powerful tool for managing complex object interactions. By using this pattern, developers can create more modular, scalable, and maintainable code.
