中介者(调停者)模式
http://www.cnblogs.com/java-my-life/archive/2012/06/20/2554024.html
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interface Mediator{
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/**
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* 同事对象在自身改变的时候来通知调停者方法 让调停者去负责相应的与其他同事对象的交互
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*/
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public void changed(Colleague c);
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}
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class ConcreteMediator implements Mediator{
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// 持有并维护同事A
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private ConcreteColleagueA colleagueA;
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// 持有并维护同事B
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private ConcreteColleagueB colleagueB;
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public void setColleagueA(ConcreteColleagueA colleagueA) {
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this.colleagueA= colleagueA;
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}
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public void setColleagueB(ConcreteColleagueB colleagueB) {
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this.colleagueB= colleagueB;
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}
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@Override
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public void changed(Colleague c) {
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/**
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* 某一个同事类发生了变化,通常需要与其他同事交互 具体协调相应的同事对象来实现协作行为
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*/
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}
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}
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abstractclass Colleague{
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// 持有一个调停者对象
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private Mediator mediator;
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/**
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* 构造函数
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*/
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public Colleague(Mediator mediator) {
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this.mediator= mediator;
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}
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/**
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* 获取当前同事类对应的调停者对象
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*/
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public Mediator getMediator() {
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return mediator;
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}
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}
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class ConcreteColleagueA extends Colleague{
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public ConcreteColleagueA(Mediator mediator) {
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super(mediator);
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}
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/**
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* 示意方法,执行某些操作
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*/
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public void operation() {
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// 在需要跟其他同事通信的时候,通知调停者对象
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getMediator().changed(this);
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}
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}
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class ConcreteColleagueB extends Colleague{
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public ConcreteColleagueB(Mediator mediator) {
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super(mediator);
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}
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/**
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* 示意方法,执行某些操作
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*/
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public void operation() {
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// 在需要跟其他同事通信的时候,通知调停者对象
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getMediator().changed(this);
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}
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}
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