设计模式-23种设计模式-行为型-中介者模式
一、中介者模式介绍
二、中介者模式引入
需求:
UML类图:
代码实现(Java):
//同事抽象类 public abstract class Colleague { private Mediator mediator; public String name; public Colleague(Mediator mediator, String name) { this.mediator = mediator; this.name = name; } public Mediator GetMediator() { return this.mediator; } public abstract void SendMessage(int stateChange); }
//具体的同事类 public class Alarm extends Colleague { //构造器 public Alarm(Mediator mediator, String name) { super(mediator, name); //在创建Alarm 同事对象时,将自己放入到ConcreteMediator 对象中[集合] mediator.Register(name, this); } public void SendAlarm(int stateChange) { SendMessage(stateChange); } @Override public void SendMessage(int stateChange) { //调用的中介者对象的getMessage this.GetMediator().GetMessage(stateChange, this.name); } }
public class CoffeeMachine extends Colleague { public CoffeeMachine(Mediator mediator, String name) { super(mediator, name); mediator.Register(name, this); } @Override public void SendMessage(int stateChange) { this.GetMediator().GetMessage(stateChange, this.name); } public void StartCoffee() { System.out.println("It's time to startcoffee!"); } public void FinishCoffee() { System.out.println("After 5 minutes!"); System.out.println("Coffee is ok!"); SendMessage(0); } }
public class TV extends Colleague { public TV(Mediator mediator, String name) { super(mediator, name); mediator.Register(name, this); } @Override public void SendMessage(int stateChange) { this.GetMediator().GetMessage(stateChange, this.name); } public void StartTv() { System.out.println("It's time to StartTv!"); } public void StopTv() { System.out.println("StopTv!"); } }
public class Curtains extends Colleague { public Curtains(Mediator mediator, String name) { super(mediator, name); mediator.Register(name, this); } @Override public void SendMessage(int stateChange) { this.GetMediator().GetMessage(stateChange, this.name); } public void UpCurtains() { System.out.println("I am holding Up Curtains!"); } }
public abstract class Mediator { //将给中介者对象,加入到集合中 public abstract void Register(String colleagueName, Colleague colleague); //接收消息, 具体的同事对象发出 public abstract void GetMessage(int stateChange, String colleagueName); public abstract void SendMessage(); }
import java.util.HashMap; //具体的中介者类 public class ConcreteMediator extends Mediator { //集合,放入所有的同事对象 private HashMap<String, Colleague> colleagueMap; private HashMap<String, String> interMap; public ConcreteMediator() { colleagueMap = new HashMap<String, Colleague>(); interMap = new HashMap<String, String>(); } @Override public void Register(String colleagueName, Colleague colleague) { colleagueMap.put(colleagueName, colleague); if (colleague instanceof Alarm) { interMap.put("Alarm", colleagueName); } else if (colleague instanceof CoffeeMachine) { interMap.put("CoffeeMachine", colleagueName); } else if (colleague instanceof TV) { interMap.put("TV", colleagueName); } else if (colleague instanceof Curtains) { interMap.put("Curtains", colleagueName); } } //具体中介者的核心方法 //1. 根据得到消息,完成对应任务 //2. 中介者在这个方法,协调各个具体的同事对象,完成任务 @Override public void GetMessage(int stateChange, String colleagueName) { //处理闹钟发出的消息 if (colleagueMap.get(colleagueName) instanceof Alarm) { if (stateChange == 0) { ((CoffeeMachine) (colleagueMap.get(interMap .get("CoffeeMachine")))).StartCoffee(); ((TV) (colleagueMap.get(interMap.get("TV")))).StartTv(); } else if (stateChange == 1) { ((TV) (colleagueMap.get(interMap.get("TV")))).StopTv(); } } else if (colleagueMap.get(colleagueName) instanceof CoffeeMachine) { ((Curtains) (colleagueMap.get(interMap.get("Curtains")))) .UpCurtains(); } else if (colleagueMap.get(colleagueName) instanceof TV) {//如果TV发现消息 } else if (colleagueMap.get(colleagueName) instanceof Curtains) { //如果是以窗帘发出的消息,这里处理... } } @Override public void SendMessage() { } }
public class ClientTest { public static void main(String[] args) { //创建一个中介者对象 Mediator mediator = new ConcreteMediator(); //创建Alarm 并且加入到 ConcreteMediator 对象的HashMap Alarm alarm = new Alarm(mediator, "alarm"); //创建了CoffeeMachine 对象,并 且加入到 ConcreteMediator 对象的HashMap CoffeeMachine coffeeMachine = new CoffeeMachine(mediator, "coffeeMachine"); //创建 Curtains , 并 且加入到 ConcreteMediator 对象的HashMap Curtains curtains = new Curtains(mediator, "curtains"); TV tV = new TV(mediator, "TV"); //让闹钟发出消息 alarm.SendAlarm(0); coffeeMachine.FinishCoffee(); alarm.SendAlarm(1); } }
三、中介者模式注意事项和细节
分类:
DesignPattern
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