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当面对一个不太顺手的程序的时候,先不要关心代码,写写自己的头脑中的思维,怎么想就怎么写,写着写着突然就变亮了。
通过一段时间
银行业务调度,根据需求做出如下银行业务运转关系图:
面向对象分析:
设计源于生活,首先先从我们一次去银行办理业务谈起,我们是怎样完成一次业务办理的呢?首先我们来到银行是取号排队,然后就是等待窗口叫号,叫到号后办理完业务,整个业务就完了
从编程分析对程序的实现:
取号器:我们的业务类型有三种业务,那么号码就分为三种号码,设置一个取号的类负责完成取号操作
号码管理器:取号器里面的号码是怎么产生的呢?号码就是由号码管理器产生的,有三种号码,但仅有一个号码管理器,为了让号码管理器的对象唯一,那么号码管理类就需要采用单列设计模式来完成
业务窗口:业务窗口分为普通窗口、快速窗口、VIP窗口,这些窗口由窗口类来实现,对于窗口在办理业务的时候都要叫号,对于号码事件,号码数据都存在号码管理器中,窗口需要从号码管理器中获得号码数据
具体代码实现:
号码的产生,号码管理器类:
public class NumberMachine { private NumberMachine(){} private static NumberMachine instance = new NumberMachine(); public static NumberMachine getInstance(){ return instance; } //三种号码的产生 private NumberManager commonManager = new NumberManager(); private NumberManager expressManager = new NumberManager(); private NumberManager vipManager = new NumberManager(); //定义方法返回号码 public NumberManager getCommonManager() { return commonManager; } public NumberManager getExpressManager() { return expressManager; } public NumberManager getVipManager() { return vipManager; } }
用户进入银行号码的获取,取号类:
public class NumberManager { private int lastNumber = 0; //使用集合存储生成的号码 private List queueNumbers = new ArrayList(); public synchronized Integer generateNewNumber(){ queueNumbers.add(++lastNumber); return lastNumber; } public synchronized Integer fetchNumber(){ //判断当前是否有号码 if(queueNumbers.size()>0){ return (Integer)queueNumbers.remove(0); }else{ return null; } } }
窗口的产生窗口类:
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; } }
窗口进行有序工作的窗口功能实现类:
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。
为了然代码数量少一点,便于阅读将张老师的提供的代码代码中一些打印语句省略
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(){ //开始获取普通任务 Integer serviceNumber = NumberMachine.getInstance().getCommonManager().fetchNumber(); if(serviceNumber != null ){ //开始为客户服务 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(); } }else{ //没有取到普通任务,并等待 try { Thread.sleep(1000); } catch (InterruptedException e) { e.printStackTrace(); } } } private void expressService(){ Integer serviceNumber = NumberMachine.getInstance().getExpressManager().fetchNumber(); if(serviceNumber !=null){ int serviceTime = Constants.MIN_SERVICE_TIME; try { Thread.sleep(serviceTime); } catch (InterruptedException e) { e.printStackTrace(); } }else{ commonService(); } } private void vipService(){ Integer serviceNumber = NumberMachine.getInstance().getVipManager().fetchNumber(); //开始获取VIP任务 if(serviceNumber !=null){ //获取到VIP任务并为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(); } }else{ //没有取到VIP任务,并获取快速窗口任务 commonService(); } } }
常量放置的类:
public class Constants { public static int MAX_SERVICE_TIME = 10000; //10秒! public static int MIN_SERVICE_TIME = 1000; //1秒! //产生一个客户的时间 public static int COMMON_CUSTOMER_INTERVAL_TIME = 1; }
代码运行的主类:
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(); } }, 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(); } }, 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(); } }, 0, Constants.COMMON_CUSTOMER_INTERVAL_TIME * 6, TimeUnit.SECONDS); } }
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