# Mediator Pattern

## 정의

다수의 클래스간의 복잡한 상호작을 분리하여 별도의 클래스에 위임을 한다. 다대다 혹은 다대1의 관계에서 복잡도를 낮추고 재사용율을 높여 유지보수를 쉽게한다.

유사한 패턴은 옵저버 패턴(Observer Pattern) 과 파사드 패턴(Facade Pattern)이 있다.

코드예시

```java
public interface Mediator {
	public void createMediator();
	public void workAll();
}
```

```java
public class MyMediator implements Mediator {
 
	private User user1;
	private User user2;
	
	public User getUser1() {
		return user1;
	}
 
	public User getUser2() {
		return user2;
	}
 
	@Override
	public void createMediator() {
		user1 = new User1(this);
		user2 = new User2(this);
	}
 
	@Override
	public void workAll() {
		user1.work();
		user2.work();
	}
}
```

```java
public abstract class User {
	
	private Mediator mediator;
	
	public Mediator getMediator(){
		return mediator;
	}
	
	public User(Mediator mediator) {
		this.mediator = mediator;
	}
 
	public abstract void work();
}
```

```java
public class User1 extends User {
 
	public User1(Mediator mediator){
		super(mediator);
	}
	
	@Override
	public void work() {
		System.out.println("user1 exe!");
	}
}
```

```java
public class User2 extends User {
 
	public User2(Mediator mediator){
		super(mediator);
	}
	
	@Override
	public void work() {
		System.out.println("user2 exe!");
	}
}
```

```java
public class Test {
 
	public static void main(String[] args) {
		Mediator mediator = new MyMediator();
		mediator.createMediator();
		mediator.workAll();
	}
}
```


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