中介者(Mediator)模式
2022/1/10 23:03:43
本文主要是介绍中介者(Mediator)模式,对大家解决编程问题具有一定的参考价值,需要的程序猿们随着小编来一起学习吧!
5. 中介者(Mediator)
Intent
集中相关对象之间复杂的沟通和控制方式。
Class Diagram
- Mediator:中介者,定义一个接口用于与各同事(Colleague)对象通信。
- Colleague:同事,相关对象
Implementation
Alarm(闹钟)、CoffeePot(咖啡壶)、Calendar(日历)、Sprinkler(喷头)是一组相关的对象,在某个对象的事件产生时需要去操作其它对象,形成了下面这种依赖结构:
![](/upload/202201/10/202201102303434062.jpg)
使用中介者模式可以将复杂的依赖结构变成星形结构:
![](/upload/202201/10/202201102303435779.jpg)
public abstract class Colleague { public abstract void onEvent(Mediator mediator); }
public class Alarm extends Colleague { @Override public void onEvent(Mediator mediator) { mediator.doEvent("alarm"); } public void doAlarm() { System.out.println("doAlarm()"); } }
public class CoffeePot extends Colleague { @Override public void onEvent(Mediator mediator) { mediator.doEvent("coffeePot"); } public void doCoffeePot() { System.out.println("doCoffeePot()"); } }
public class Calender extends Colleague { @Override public void onEvent(Mediator mediator) { mediator.doEvent("calender"); } public void doCalender() { System.out.println("doCalender()"); } }
public class Sprinkler extends Colleague { @Override public void onEvent(Mediator mediator) { mediator.doEvent("sprinkler"); } public void doSprinkler() { System.out.println("doSprinkler()"); } }
public abstract class Mediator { public abstract void doEvent(String eventType); }
public class ConcreteMediator extends Mediator { private Alarm alarm; private CoffeePot coffeePot; private Calender calender; private Sprinkler sprinkler; public ConcreteMediator(Alarm alarm, CoffeePot coffeePot, Calender calender, Sprinkler sprinkler) { this.alarm = alarm; this.coffeePot = coffeePot; this.calender = calender; this.sprinkler = sprinkler; } @Override public void doEvent(String eventType) { switch (eventType) { case "alarm": doAlarmEvent(); break; case "coffeePot": doCoffeePotEvent(); break; case "calender": doCalenderEvent(); break; default: doSprinklerEvent(); } } public void doAlarmEvent() { alarm.doAlarm(); coffeePot.doCoffeePot(); calender.doCalender(); sprinkler.doSprinkler(); } public void doCoffeePotEvent() { // ... } public void doCalenderEvent() { // ... } public void doSprinklerEvent() { // ... } }
public class Client { public static void main(String[] args) { Alarm alarm = new Alarm(); CoffeePot coffeePot = new CoffeePot(); Calender calender = new Calender(); Sprinkler sprinkler = new Sprinkler(); Mediator mediator = new ConcreteMediator(alarm, coffeePot, calender, sprinkler); // 闹钟事件到达,调用中介者就可以操作相关对象 alarm.onEvent(mediator); } }
doAlarm() doCoffeePot() doCalender() doSprinkler()
JDK
- All scheduleXXX() methods of java.util.Timer
- java.util.concurrent.Executor#execute()
- submit() and invokeXXX() methods of java.util.concurrent.ExecutorService
- scheduleXXX() methods of java.util.concurrent.ScheduledExecutorService
- java.lang.reflect.Method#invoke()
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