一.
1.NumberManager.java
package cn.itcast.bankqueue; import java.util.ArrayList; import java.util.List; public class NumberManager { private int lastNumber = 0; private List queueNumbers = new ArrayList(); public synchronized Integer generateNewNumber(){ queueNumbers.add(++lastNumber); return lastNumber; } public synchronized Integer fetchNumber(){ if(queueNumbers.size()>0){ return (Integer)queueNumbers.remove(0); }else{ return null; } } }
2.NumberMachine.java
package cn.itcast.bankqueue; public class NumberMachine { private NumberMachine(){} private static NumberMachine instance = new NumberMachine(); public static NumberMachine getInstance(){ return instance; } 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; } }
3.ServiceWindow.java
package cn.itcast.bankqueue; import java.util.Random; import java.util.concurrent.Executors; import java.util.logging.Logger; /** * 没有把VIP窗口和快速窗口做成子类，是因为实际业务中的普通窗口可以随时被设置为VIP窗口和快速窗口。 * */ public class ServiceWindow { private static Logger logger = Logger.getLogger("cn.itcast.bankqueue"); private CustomerType type = CustomerType.COMMON; private int number = 1; public CustomerType getType() { return type; } public void setType(CustomerType type) { this.type = type; } public void setNumber(int number){ this.number = number; } public void start(){ Executors.newSingleThreadExecutor().execute( new Runnable(){ public void run(){ //下面这种写法的运行效率低，最好是把while放在case下面 while(true){ switch(type){ case COMMON: commonService(); break; case EXPRESS: expressService(); break; case VIP: vipService(); break; } } } } ); } private void commonService(){ String windowName = "第" + number + "号" + type + "窗口"; System.out.println(windowName + "开始获取普通任务!"); Integer serviceNumber = NumberMachine.getInstance().getCommonManager().fetchNumber(); if(serviceNumber != null ){ System.out.println(windowName + "开始为第" + serviceNumber + "号普通客户服务"); int maxRandom = Constants.MAX_SERVICE_TIME - Constants.MIN_SERVICE_TIME; int serviceTime = new Random().nextInt(maxRandom)+1 + Constants.MIN_SERVICE_TIME; try { Thread.sleep(serviceTime); } catch (InterruptedException e) { e.printStackTrace(); } System.out.println(windowName + "完成为第" + serviceNumber + "号普通客户服务，总共耗时" + serviceTime/1000 + "秒"); }else{ System.out.println(windowName + "没有取到普通任务，正在空闲一秒"); try { Thread.sleep(1000); } catch (InterruptedException e) { e.printStackTrace(); } } } private void expressService(){ Integer serviceNumber = NumberMachine.getInstance().getExpressManager().fetchNumber(); String windowName = "第" + number + "号" + type + "窗口"; System.out.println(windowName + "开始获取快速任务!"); if(serviceNumber !=null){ System.out.println(windowName + "开始为第" + serviceNumber + "号快速客户服务"); int serviceTime = Constants.MIN_SERVICE_TIME; try { Thread.sleep(serviceTime); } catch (InterruptedException e) { e.printStackTrace(); } System.out.println(windowName + "完成为第" + serviceNumber + "号快速客户服务，总共耗时" + serviceTime/1000 + "秒"); }else{ System.out.println(windowName + "没有取到快速任务！"); commonService(); } } private void vipService(){ Integer serviceNumber = NumberMachine.getInstance().getVipManager().fetchNumber(); String windowName = "第" + number + "号" + type + "窗口"; System.out.println(windowName + "开始获取VIP任务!"); if(serviceNumber !=null){ System.out.println(windowName + "开始为第" + serviceNumber + "号VIP客户服务"); int maxRandom = Constants.MAX_SERVICE_TIME - Constants.MIN_SERVICE_TIME; int serviceTime = new Random().nextInt(maxRandom)+1 + Constants.MIN_SERVICE_TIME; try { Thread.sleep(serviceTime); } catch (InterruptedException e) { e.printStackTrace(); } System.out.println(windowName + "完成为第" + serviceNumber + "号VIP客户服务，总共耗时" + serviceTime/1000 + "秒"); }else{ System.out.println(windowName + "没有取到VIP任务！"); commonService(); } } }
4.MainClass.java
package cn.itcast.bankqueue; import java.util.concurrent.Executors; import java.util.concurrent.TimeUnit; import java.util.logging.Logger; public class MainClass { private static Logger logger = Logger.getLogger("cn.itcast.bankqueue"); public static void main(String[] args) { //产生4个普通窗口 for(int i=1;i<5;i++){ ServiceWindow window = new ServiceWindow(); window.setNumber(i); window.start(); } //产生1个快速窗口 ServiceWindow expressWindow = new ServiceWindow(); expressWindow.setType(CustomerType.EXPRESS); expressWindow.start(); //产生1个VIP窗口 ServiceWindow vipWindow = new ServiceWindow(); vipWindow.setType(CustomerType.VIP); vipWindow.start(); //普通客户拿号 Executors.newScheduledThreadPool(1).scheduleAtFixedRate( new Runnable(){ public void run(){ Integer serviceNumber = NumberMachine.getInstance().getCommonManager().generateNewNumber(); /** * 采用logger方式，无法看到直观的运行效果，因为logger.log方法内部并不是直接把内容打印出出来， * 而是交给内部的一个线程去处理，所以，打印出来的结果在时间顺序上看起来很混乱。 */ //logger.info("第" + serviceNumber + "号普通客户正在等待服务！"); System.out.println("第" + serviceNumber + "号普通客户正在等待服务！"); } }, 0, Constants.COMMON_CUSTOMER_INTERVAL_TIME, TimeUnit.SECONDS); //快速客户拿号 Executors.newScheduledThreadPool(1).scheduleAtFixedRate( new Runnable(){ public void run(){ Integer serviceNumber = NumberMachine.getInstance().getExpressManager().generateNewNumber(); System.out.println("第" + serviceNumber + "号快速客户正在等待服务！"); } }, 0, Constants.COMMON_CUSTOMER_INTERVAL_TIME * 2, TimeUnit.SECONDS); //VIP客户拿号 Executors.newScheduledThreadPool(1).scheduleAtFixedRate( new Runnable(){ public void run(){ Integer serviceNumber = NumberMachine.getInstance().getVipManager().generateNewNumber(); System.out.println("第" + serviceNumber + "号VIP客户正在等待服务！"); } }, 0, Constants.COMMON_CUSTOMER_INTERVAL_TIME * 6, TimeUnit.SECONDS); } }
5.CustomerType.java 辅助类，枚举类
package cn.itcast.bankqueue; public enum CustomerType { COMMON,EXPRESS,VIP; public String toString(){ String name = null; switch(this){ case COMMON: name = "普通"; break; case EXPRESS: name = "快速"; break; case VIP: name = name(); break; } return name; } }
6.Constants.java
package cn.itcast.bankqueue; public class Constants { public static int MAX_SERVICE_TIME = 10000; //10秒！ public static int MIN_SERVICE_TIME = 1000; //1秒！ /*每个普通窗口服务一个客户的平均时间为5秒，一共有4个这样的窗口，也就是说银行的所有普通窗口合起来 * 平均1.25秒内可以服务完一个普通客户，再加上快速窗口和VIP窗口也可以服务普通客户，所以， * 1秒钟产生一个普通客户比较合理，*/ public static int COMMON_CUSTOMER_INTERVAL_TIME = 1; }
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