黑马程序员--第二十八天：银行业务调度系统

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package com.itheima.bankqueue;import java.util.concurrent.Executors;import java.util.concurrent.TimeUnit;public class Main {//与张孝祥老师的相比，该类提取了一个customerThread 方法。public static void main(String[] args) {for(int i=1;i<5;i++){new ServiceWindow(i,CustomerType.COMMON).start();}new ServiceWindow(1,CustomerType.EXPRESS).start();new ServiceWindow(1,CustomerType.VIP).start();customerThread(CustomerType.COMMON, 1);customerThread(CustomerType.EXPRESS, 2);customerThread(CustomerType.VIP, 6);}public static void customerThread(final CustomerType type, int time){Executors.newScheduledThreadPool(1).scheduleAtFixedRate(new Runnable() {@Overridepublic void run() {// TODO Auto-generated method stubNumberMachine.newInstance().getManager(type).generateQueue(type);}}, 0, time, TimeUnit.SECONDS);}}package com.itheima.bankqueue;import java.util.Random;import java.util.concurrent.Executors;public class ServiceWindow {//与张孝祥老师的相比该类以CustomerType的参数类确定具体的窗口服务，减少了2段代码。private CustomerType type = CustomerType.COMMON;private int num = 1;private String winName = "第"+num+"号 "+type+"窗口";public ServiceWindow(){}public ServiceWindow(int num,CustomerType type){this.num = num;this.type = type;winName = "第"+num+"号 "+type+"窗口";}public void setType(CustomerType type) {this.type = type;}public void setNum(int num) {this.num = num;}public void start(){//启动一个线程来运行一个窗口的服务Executors.newSingleThreadExecutor().execute(new Runnable() {@Overridepublic void run() {while(true){serve(type);}}});}public void serve(CustomerType type){//一个窗口的服务以该 窗口的类型来确定。System.out.println(winName+"开始获取"+type+"任务。");Integer customerNum = NumberMachine.newInstance().getManager(type).fetchNum();if(customerNum!=null){System.out.println(winName+"开始为第"+customerNum+"号"+type+"客户服务。");int serviceTime = serveTime(type);try {Thread.sleep(serviceTime);} catch (InterruptedException e) {e.printStackTrace();}System.out.println(winName+"完成为第"+customerNum+"号"+type+"客户服务，总共耗时"+serviceTime/1000+"秒");}else{nextServe(type);}}public void nextServe(CustomerType type){//没有等待服务的客户时，不同的窗口 以不同的方式结束一次服务。if(type != CustomerType.COMMON){System.out.println(winName+"没有取到"+type+"任务。");serve(CustomerType.COMMON);}else{System.out.println(winName+"没有取到普通任务，休息一秒");try {Thread.sleep(1000);} catch (InterruptedException e) {e.printStackTrace();}}}public int serveTime(CustomerType type){//服务时间if(type == CustomerType.EXPRESS)return Constants.MIN_SERVE_TIME;return new Random().nextInt(Constants.MAX_SERVE_TIME-Constants.MIN_SERVE_TIME)+Constants.MIN_SERVE_TIME;}}package com.itheima.bankqueue;public class NumberMachine {private static NumberMachine numMachine = new NumberMachine();public static NumberMachine newInstance(){return numMachine;}private NumberManager commonManager = new NumberManager();private NumberManager expressManager = new NumberManager();private NumberManager VIPManager = new NumberManager();public NumberManager getCommonManager() {return commonManager;}public NumberManager getExpressManager() {return expressManager;}public NumberManager getVIPManager() {return VIPManager;}public NumberManager getManager(CustomerType type){switch(type){case COMMON:return commonManager;case EXPRESS:return expressManager;}return VIPManager;}}package com.itheima.bankqueue;import java.util.ArrayList;import java.util.List;public class NumberManager {private List<Integer> queueNum = new ArrayList<Integer>();private int lastNum = 0;public synchronized void generateQueue(CustomerType type){queueNum.add(++lastNum);System.out.println("第"+lastNum+type+"号客户正在等待服务。");}public synchronized Integer fetchNum(){if(queueNum.isEmpty())return null;return queueNum.remove(0);}}package com.itheima.bankqueue;public enum CustomerType {COMMON,EXPRESS,VIP;@Overridepublic String toString() {// TODO Auto-generated method stubswitch(this){case COMMON:return "普通";case EXPRESS:return "快速";}return super.toString();}}package com.itheima.bankqueue;public class Constants {public static final int MAX_SERVE_TIME = 10000;public static final int MIN_SERVE_TIME = 1000;}

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