GOF23设计模式之 中介者模式Mediator
2015-10-03 23:43
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核心
如果一个系统中对象之间的联系呈现为网状结构,对象之间存在大量多对多的关系,将熬制关系及其复杂,这些对象称之为 “同事对象”我们可以阴雨一个中介者对象,使各个同事对象只跟中介者打交道,将复杂的网络结构化解为星形结构。
中介者模式类图
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开发当中常见的场景
MVC模式(其中的C,控制器就是一个中介者对象。M和V都和他打交道)窗口游戏程序,窗口软件开发中窗口对象也是一个中介者对象
图形界面开发GUI中,多个组件之间的交互,可以通过引入一个中介者对象来解决,可以使整体的窗口对象或者DOM对象
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Java.lang.reflect.Method#invoke()
一种实现
Mediatorpackage com.coderbean.mediator; /** * Created by Chang on 15/10/3. */ public interface Mediator { void register(String dname, Department d); void command(String name); }
President
package com.coderbean.mediator; import java.util.HashMap; import java.util.Map; /** * Created by Chang on 15/10/3. */ public class President implements Mediator { private Map<String,Department> map = new HashMap<String, Department>(); @Override public void register(String dname, Department d) { this.map.put(dname,d); } @Override public void command(String name) { map.get(name).selfAction(); } }
Department
package com.coderbean.mediator; /** * 同事类接口 * Created by Chang on 15/10/3. */ public interface Department { void selfAction(); //做本部门的事情 void outAction(); //向总经理发出申请 }
Finacial
package com.coderbean.mediator; /** * Created by Chang on 15/10/3. */ public class Finacial implements Department { private Mediator m; public Finacial(Mediator m) { this.m = m; m.register("Finacial", this); } @Override public void selfAction() { System.out.println("数钱"); } @Override public void outAction() { System.out.println("汇报工作,钱太多了,不知道怎么花?"); } }
Market
package com.coderbean.mediator; /** * Created by Chang on 15/10/3. */ public class Market implements Department { private Mediator m; public Market(Mediator m) { this.m = m; m.register("Market", this); } @Override public void selfAction() { System.out.println("跑去接项目"); } @Override public void outAction() { System.out.println("汇报工作,项目承接的进度,需要资金支持"); m.command("Finacial"); } }
Development
package com.coderbean.mediator; /** * Created by Chang on 15/10/3. */ public class Development implements Department { private Mediator m; public Development(Mediator m) { this.m = m; m.register("Development", this); } @Override public void selfAction() { System.out.println("专心科研,做研发"); } @Override public void outAction() { System.out.println("汇报工作,没钱了"); } }
Client
package com.coderbean.mediator; /** * Created by Chang on 15/10/3. */ public class Client { public static void main(String[] args) { Mediator mediator = new President(); Department market = new Market(mediator); Department department = new Development(mediator); Department Finacial = new Finacial(mediator); market.selfAction(); market.outAction(); } }
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