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mediator pattern in design pattern

Amjad Saeed answered on July 30, 2023 Popularity 10/10 Helpfulness 1/10

answer mediator pattern in design pattern

related Mediator pattern

mediator pattern in design pattern

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5. Mediator Pattern:
The Mediator pattern defines an object that encapsulates how a set of objects interact. It promotes loose coupling by keeping objects from referring to each other explicitly.

Example in React:
Suppose you have multiple components in your React application, and you want to create a mediator to manage communication between them.

import React, { useState } from 'react';

// Mediator
const Mediator = () => {
  const [state, setState] = useState('');

  const sendMessage = (message) => {
    setState(message);
  };

  return (
    <div>
      <p>Mediator State: {state}</p>
      <ComponentA sendMessage={sendMessage} />
      <ComponentB sendMessage={sendMessage} />
    </div>
  );
};

// Components
const ComponentA = ({ sendMessage }) => {
  const handleClick = () => {
    sendMessage('Hello from Component A');
  };

  return (
    <button onClick={handleClick}>Send Message from A</button>
  );
};

const ComponentB = ({ sendMessage }) => {
  const handleClick = () => {
    sendMessage('Hello from Component B');
  };

  return (
    <button onClick={handleClick}>Send Message from B</button>
  );
};

const MediatorPatternExample = () => {
  return (
    <div>
      <Mediator />
    </div>
  );
};

export default MediatorPatternExample;

Popularity 10/10 Helpfulness 1/10 Language javascript

Source: Grepper

Tags: javascript mediator

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Contributed on Sep 14 2023

Amjad Saeed

0 Answers Avg Quality 2/10

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using System;
using System.Collections.Generic;

// Mediator interface
public interface IChatRoom
{
    void SendMessage(string message, string senderName);
    void RegisterUser(User user);
}

// Concrete mediator class (Chat Room)
public class ChatRoom : IChatRoom
{
    private readonly Dictionary<string, User> users = new Dictionary<string, User>();

    public void SendMessage(string message, string senderName)
    {
        if (users.TryGetValue(senderName, out User sender))
        {
            foreach (var user in users.Values)
            {
                if (user != sender)
                {
                    user.ReceiveMessage(message, senderName);
                }
            }
        }
    }

    public void RegisterUser(User user)
    {
        if (!users.ContainsKey(user.Name))
        {
            users.Add(user.Name, user);
        }
    }
}

// Colleague interface
public abstract class User
{
    protected IChatRoom chatRoom;
    public string Name { get; private set; }

    public User(string name, IChatRoom chatRoom)
    {
        Name = name;
        this.chatRoom = chatRoom;
        chatRoom.RegisterUser(this);
    }

    public abstract void Send(string message);
    public abstract void ReceiveMessage(string message, string senderName);
}

// Concrete colleague class (Regular User)
public class RegularUser : User
{
    public RegularUser(string name, IChatRoom chatRoom) : base(name, chatRoom)
    {
    }

    public override void Send(string message)
    {
        Console.WriteLine($"Regular User '{Name}' sends: {message}");
        chatRoom.SendMessage(message, Name);
    }

    public override void ReceiveMessage(string message, string senderName)
    {
        Console.WriteLine($"Regular User '{Name}' received from '{senderName}': {message}");
    }
}

// Concrete colleague class (Premium User)
public class PremiumUser : User
{
    public PremiumUser(string name, IChatRoom chatRoom) : base(name, chatRoom)
    {
    }

    public override void Send(string message)
    {
        Console.WriteLine($"Premium User '{Name}' sends: {message}");
        chatRoom.SendMessage(message, Name);
    }

    public override void ReceiveMessage(string message, string senderName)
    {
        Console.WriteLine($"Premium User '{Name}' received from '{senderName}': {message}");
    }
}

class Program
{
    static void Main()
    {
        IChatRoom chatRoom = new ChatRoom();

        // Create users and register them with the chat room (mediator)
        User john = new RegularUser("John", chatRoom);
        User anna = new PremiumUser("Anna", chatRoom);
        User mike = new RegularUser("Mike", chatRoom);

        // Send messages
        john.Send("Hello, everyone!");
        anna.Send("Hi, John!");
        mike.Send("Hey, guys!");

        /*
         * Sample Output:
         * Regular User 'John' sends: Hello, everyone!
         * Regular User 'Mike' received from 'John': Hello, everyone!
         * Premium User 'Anna' sends: Hi, John!
         * Regular User 'John' received from 'Anna': Hi, John!
         * Regular User 'Mike' sends: Hey, guys!
         * Regular User 'John' received from 'Mike': Hey, guys!
         * Premium User 'Anna' received from 'Mike': Hey, guys!
         */
    }
}

Popularity 10/10 Helpfulness 1/10 Language csharp

Source: chat.openai.com

Tags: c# c

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Contributed on Jul 30 2023

mahnaz foroutan

0 Answers Avg Quality 2/10

mediator pattern in design pattern

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