JAVA设计模式（14）：行为型-中介者模式（Mediator）

标签：java   设计模式   中介者模式   

场景

假如没有总经理。下面三个部门：财务部、市场部、研发部。财务部要发工资，让大家核对公司需要市场需要跟市场部和研发部通气；市场部需要接个新项目，需要研发部处理技术、需要财务部出资金。市场部跟各个部门打交道。虽然只有三个部门，但是关系非常乱。

核心

中介者模式的本质

解耦多个同事对象之间的交互关系。每个对象都持有中介者对象的引用，只跟中介者对象打交道。我们通过中介者对象统一管理这些交互关系。

public interface Department {
	/**/
	void selfAction();
	/*向总经理发出请求*/
	void outAction();
}

public class Development implements Department{
	/*持有中介者的引用*/
	private Mediator mediator;
	
	public Development(Mediator mediator) {
		super();
		this.mediator = mediator;
		mediator.register("development", this);
	}

	@Override
	public void selfAction() {
		// TODO Auto-generated method stub
		System.out.println("专心研发");
	}

	@Override
	public void outAction() {
		// TODO Auto-generated method stub
		System.out.println("汇报工作：没钱了，需要资金支持");
		mediator.command("finacial");
	}

}

public class Finacial implements Department{
	/*持有中介者的引用*/
	private Mediator mediator;
	
	public Finacial(Mediator mediator) {
		super();
		this.mediator = mediator;
		mediator.register("finacial", this);
	}

	@Override
	public void selfAction() {
		// TODO Auto-generated method stub
		System.out.println("数钱");
	}

	@Override
	public void outAction() {
		// TODO Auto-generated method stub
		System.out.println("汇报工作：钱太多了，怎么花");
	}

}

public class Market implements Department{
	/*持有中介者的引用*/
	private Mediator mediator;
	
	public Market(Mediator mediator) {
		super();
		this.mediator = mediator;
		mediator.register("market", this);
	}

	@Override
	public void selfAction() {
		// TODO Auto-generated method stub
		System.out.println("接项目");
	}

	@Override
	public void outAction() {
		// TODO Auto-generated method stub
		System.out.println("汇报工作：需要资金支持");
		mediator.command("finacial");
	}

}

public interface Mediator {
	void register(String dname,Department dept);
	
	void command(String dname);
}

public class President implements Mediator{
	
	private Map<String, Department> map = new HashMap<String, Department>();

	@Override
	public void register(String dname, Department dept) {
		// TODO Auto-generated method stub
		map.put(dname, dept);
	}

	@Override
	public void command(String dname) {
		// TODO Auto-generated method stub
		map.get(dname).selfAction();
	}

}

public class Client {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Mediator m = new President();
		
		Market market = new Market(m);
		Development devp = new Development(m);
		Finacial f = new Finacial(m);
		
		market.selfAction();
		market.outAction();
	}

}

JAVA设计模式（14）：行为型-中介者模式（Mediator）

标签：java   设计模式   中介者模式   

原文地址：http://blog.csdn.net/lovesomnus/article/details/45600979