Java mediator github

Java mediator github

Here is a detailed explanation of the Java Mediator pattern and its implementation using GitHub:

What is the Mediator Pattern?

The Mediator pattern is a behavioral design pattern that allows you to reduce complex interactions between objects by introducing an intermediary object (mediator) that controls how they interact with each other. This pattern helps to decouple objects, making it easier to add or remove them without affecting the overall system.

When to use the Mediator Pattern?

You should use the Mediator pattern when:

Java Mediator Pattern Implementation

Here's an example implementation of the Mediator pattern in Java using GitHub:

// ChatMediator.java
public interface ChatMediator {
void sendMessage(String message, User user);
}
// ConcreteChatMediator.java
public class ConcreteChatMediator implements ChatMediator {
private List users;
public ConcreteChatMediator() {
this.users = new ArrayList<>();
}
@Override
public void sendMessage(String message, User user) {
for (User u : users) {
if (!u.equals(user)) {
u.receiveMessage(message);
}
}
}
public void addUser(User user) {
users.add(user);
}
}
// User.java
public class User {
private String name;
private ChatMediator mediator;
public User(String name, ChatMediator mediator) {
this.name = name;
this.mediator = mediator;
}
public void send_message(String message) {
mediator.sendMessage(message, this);
}
public void receiveMessage(String message) {
System.out.println(name + " received: " + message);
}
}
// ChatUser.java
public class ChatUser extends User {
public ChatUser(String name, ChatMediator mediator) {
super(name, mediator);
}
@Override
public void send_message(String message) {
mediator.sendMessage(message, this);
}
}

In this example:

Benefits of using the Mediator Pattern

Example Usage

Here's an example usage of the Mediator pattern in GitHub:

public class ChatApp {
public static void main(String[] args) {
ConcreteChatMediator mediator = new ConcreteChatMediator();
User user1 = new ChatUser("John", mediator);
User user2 = new ChatUser("Jane", mediator);
user1.send_message("Hello!");
user2.send_message("Hi John!");
// Output:
// John received: Hello!
// Jane received: Hi John!
}
}

In this example, we create a ConcreteChatMediator and two users (user1 and user2). We then use the mediator to send messages between users. The output shows that both users receive the messages.

This is just a simple example of how you can implement the Mediator pattern in Java using GitHub. You can apply this pattern to more complex systems, such as online chat platforms or social media networks.

Java mediator example

Here's a detailed example of how to implement the Mediator design pattern in Java:

The Mediator pattern is used to reduce complex dependencies between objects and facilitate communication between them without having direct references. It's an alternative approach to traditional event-driven or callback-based systems.

Let's take a simple chat room application as an example, where multiple users can send and receive messages. We want to implement this functionality using the Mediator pattern.

Here's a simplified code example:

// The mediator interface
interface ChatRoom {
void sendMessage(String message);
}
class User extends Thread {
private String name;
private ChatRoom chatRoom;
public User(String name, ChatRoom chatRoom) {
this.name = name;
this.chatRoom = chatRoom;
}
public void run() {
for (int i = 0; i < 5; i++) {
String message = "Hello from user " + name;
chatRoom.sendMessage(message);
try {
Thread.sleep(1000); // Simulate a delay
} catch (InterruptedException e) {
System.out.println(e.getMessage());
}
}
}
}
// Concrete mediator class: Chat Room
class DefaultChatRoom implements ChatRoom {
private List users;
public DefaultChatRoom() {
this.users = new ArrayList<>();
}
@Override
public void sendMessage(String message) {
for (User user : users) {
user.interrupt(); // Send the message to each user
System.out.println("Sending message: " + message);
}
}
public void addUser(User user) {
this.users.add(user);
}
}
public class ChatRoomExample {
public static void main(String[] args) throws InterruptedException {
DefaultChatRoom chatRoom = new DefaultChatRoom();
for (int i = 0; i < 5; i++) {
User user = new User("User " + i, chatRoom);
user.start();
chatRoom.addUser(user);
}
Thread.sleep(10000); // Simulate a delay
}
}

In this example:

To reduce complexity:

By implementing the Mediator design pattern in Java:

This is just a simplified example, but the Mediator pattern has many practical applications in software development, such as event-driven systems, GUI components, and communication networks.