JavaScript设计模式之调停者模式实例详解

function CDDriver( mediator ) {
  //持有一个调停者对象
  this.mediator = mediator;
  /
    获取当前同事类对应的调停者对象
   /
  this.getMediator = function() {
    return mediator;
  }
 //光驱读取出来的数据
 this.data = "";
  /
    获取光盘读取出来的数据
   /
  this.getData = function() {
    return this.data;
  }
  /
    读取光盘
   /
  this.readCD = function(){
    //逗号前是视频显示的数据，逗号后是声音
    this.data = "西游记,老孙来也！";
    //通知主板，自己的状态发生了改变
    this.getMediator().changed(this);
  }
}

function CPU( mediator ) {
 //持有一个调停者对象
 this.mediator = mediator;
 /
   获取当前同事类对应的调停者对象
  /
 this.getMediator = function() {
   return mediator;
 }
  //分解出来的视频数据
  this.videoData = "";
  //分解出来的声音数据
  this.soundData = "";
  /
    获取分解出来的视频数据
   /
  this.getVideoData = function() {
    return this.videoData;
  }
  /
    获取分解出来的声音数据
   /
  this.getSoundData = function() {
    return this.soundData;
  }
  /
    处理数据，把数据分成音频和视频的数据
   /
  this.executeData = function(data){
    //把数据分解开，前面是视频数据，后面是音频数据
    var array = data.split(",");
    this.videoData = array[0];
    this.soundData = array[1];
    //通知主板，CPU完成工作
    this.getMediator().changed(this);
  }
}

function VideoCard( mediator ) {
  //持有一个调停者对象
  this.mediator = mediator;
  /
    获取当前同事类对应的调停者对象
   /
  this.getMediator = function() {
    return mediator;
  }
  /
    显示视频数据
   /
  this.showData = function(data){
    console.log("正在播放的是" + data);
  }
}

function SoundCard( mediator ){
  //持有一个调停者对象
  this.mediator = mediator;
  /
    获取当前同事类对应的调停者对象
   /
  this.getMediator = function() {
    return mediator;
  }
  /
    按照声频数据发出声音
   /
  this.soundData = function(data){
    console.log("输出音频" + data);
  }
}

function MainBoard() {
  //需要知道要交互的同事类——光驱类
  this.cdDriver = null;
  //需要知道要交互的同事类——CPU类
  this.cpu = null;
  //需要知道要交互的同事类——显卡类
  this.videoCard = null;
  //需要知道要交互的同事类——声卡类
  this.soundCard = null;
  this.setCdDriver = function(cdDriver) {
    this.cdDriver = cdDriver;
  }
  this.setCpu = function(cpu) {
    this.cpu = cpu;
  }
  this.setVideoCard = function(videoCard) {
    this.videoCard = videoCard;
  }
  this.setSoundCard = function(soundCard) {
    this.soundCard = soundCard;
  }
  this.changed = function(c) {
    if(c instanceof CDDriver){
      //表示光驱读取数据了
      this.opeCDDriverReadData(c);
    }else if(c instanceof CPU){
      this.opeCPU(c);
    }
  }
  /
    处理光驱读取数据以后与其他对象的交互
   /
  this.opeCDDriverReadData = function(cd){
    //先获取光驱读取的数据
    var data = cd.getData();
    //把这些数据传递给CPU进行处理
    cpu.executeData(data);
  }
  /
    处理CPU处理完数据后与其他对象的交互
   /
  this.opeCPU = function(cpu){
    //先获取CPU处理后的数据
    var videoData = cpu.getVideoData();
    var soundData = cpu.getSoundData();
    //把这些数据传递给显卡和声卡展示出来
    this.videoCard.showData(videoData);
    this.soundCard.soundData(soundData);
  }
}

//创建调停者——主板
var mediator = new MainBoard();
//创建同事类
var cd = new CDDriver(mediator);
var cpu = new CPU(mediator);
var vc = new VideoCard(mediator);
var sc = new SoundCard(mediator);
//让调停者知道所有同事
mediator.setCdDriver(cd);
mediator.setCpu(cpu);
mediator.setVideoCard(vc);
mediator.setSoundCard(sc);
//开始看电影，把光盘放入光驱，光驱开始读盘
 cd.readCD();