黑马程序员_银行业务调度系统

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需求分析：

 

有三种对应类型的客户：VIP客户，普通客户，快速客户，异步随机生成各种类型的客户，各类型客户在其对应窗口按顺序依次办理业务。

每一个客户其实就是由银行的一个取号机器产生号码的方式来表示的。所以，要有一个号码管理器对象，让这个对象不断地产生号码，就等于随机生成了客户。

由于有三类客户，每类客户的号码编排都是完全独立的，所以，本系统一共要产生三个号码管理器对象，各自管理一类用户的排队号码。这三个号码管理器对象统一由一个号码机器进行管理，这个号码机器在整个系统中始终只能有一个，所以，它要被设计成单例。

各类型客户在其对应窗口按顺序依次办理业务，准确地说，应该是窗口依次叫号。

各个窗口怎么知道该叫哪一个号了呢？它一定是问的相应的号码管理器，即服务窗口每次找号码管理器获取当前要被服务的号码。

 

程序总共需要六个类：

NumberManager,NumberMachine,CustomerType,ServiceWindow,Constants,MainClass。

 

NumberManager类

定义一个用于存储上一个客户号码的成员变量和用于存储所有等待服务的客户号码的队列集合。

定义一个产生新号码的方法和获取马上要为之服务的号码的方法，这两个方法被不同的线程操作了相同的数据，所以，要进行同步。

 

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;

              }

       }

}

 

NumberMachine类

定义三个成员变量分别指向三个NumberManager对象，分别表示普通、快速和VIP客户的号码管理器，定义三个对应的方法来返回这三个NumberManager对象。

将NumberMachine类设计成单例。

 

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 ex
4000
pressManager;

}

public NumberManager getVipManager() {

        return vipManager;

}

}

 

CustomerType枚举类

系统中有三种类型的客户，所以用定义一个枚举类，其中定义三个成员分别表示三种类型的客户。

重写toString方法，返回类型的中文名称。这是在后面编码时重构出来的，刚开始不用考虑。

 

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;

}

}

 

ServiceWindow类

定义一个start方法，内部启动一个线程，根据服务窗口的类别分别循环调用三个不同的方法。

定义三个方法分别对三种客户进行服务，为了观察运行效果，应详细打印出其中的细节信息。

 

import java.util.Random;

import java.util.concurrent.Executors;

 

/**

 *
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 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(){

                                          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);

               
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      } 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();

              }    

       }

}

 

Constants类

定义三个常量：MAX_SERVICE_TIME、MIN_SERVICE_TIME、COMMON_CUSTOMER_INTERVAL_TIME

 

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;   

}

 

MainClass类

用for循环创建出4个普通窗口，再创建出1个快速窗口和一个VIP窗口。

接着再创建三个定时器，分别定时去创建新的普通客户号码、新的快速客户号码、新的VIP客户号码。

 

import java.util.concurrent.Executors;

import java.util.concurrent.TimeUnit;

 

public class MainClass {

      

      

 

       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();

                                         

                                          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);

       }

 

}

 

 

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