黑马程序员--银行业务调度系统学习
1、NumberManager类，使用队列集合存储序号，提供新来客户索取序号的方法和服务窗口索取要服务的序号的方法。
import java.util.*;
public class NumberManager
{
private int number=0;
private List<Integer> queue=new ArrayList<Integer>();
public synchronized Integer generateNumber()
{
queue.add(++number);;
return number;
}
public synchronized Integer fetchServiceNumber()
{
Integer number=null;
if(queue.size()>0)
{
number= queue.remove(0);
}
return number;
}
}
2、NumberMachine类，定义普通、快速和VIP客户的号码管理器，分别用来操作三种业务的序号。NumberMachine类设计成单例。
public class NumberMachine
{
private static NumberMachine instance=new NumberMachine();
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;
}
private NumberMachine(){}
public static NumberMachine getInstance()
{
return instance;
}
}
3、定义三种客户的枚举类型，实现toString()方法。
public enum CustomerType
{
COMMON,EXPRESS,VIP;
public String toString()
{
switch(this)
{
case COMMON:
return "普通";
case EXPRESS:
return "快速";
case VIP:
return "VIP";
default:
return null;
}
}
}
4、常量类Constants类，存储最大服务时间、最小服务时间和生成三种客户的间隔时间等常量。
public class Constants
{
public static int MAX_SERVICE_TIME=10000;
public static int MIN_SERVICE_TIME=1000;
public static int COMMON_CUSTOMER_INTERVAL_TIME=1;
public static int EXPRESS_CUSTOMER_INTERVAL_TIME=2;
public static int VIP_CUSTOMER_INTERVAL_TIME=6;
}
5、ServiceWindow类，服务窗口通过一个线程对三种客户进行服务。
import java.util.Random;
import java.util.concurrent.Executors;
public class ServiceWindow
{
private CustomerType customerType;
private int windowId;
public void setCustomerType(CustomerType customerType)
{
this.customerType=customerType;
}
public void setWindowId(int windowsId)
{
this.windowId=windowsId;
}
public void start()
{
Executors.newSingleThreadExecutor().execute(new Runnable()
{
public void run()
{
while(true)
{
switch(customerType)
{
case COMMON:
CommonCustomerService();
break;
case EXPRESS:
ExpressCustomerService();
break;
case VIP:
VipCustomerService();
break;
}
}
}
});
}
private void CommonCustomerService()
{
String windowName="第"+windowId+"号"+customerType+"窗口";
System.out.println(windowName+"正在获取任务...");
Integer number=NumberMachine.getInstance().getCommonManager().fetchServiceNumber();
if(number!=null)
{
long startTime=System.currentTimeMillis();
int maxRand=Constants.MAX_SERVICE_TIME-Constants.MIN_SERVICE_TIME;
long serviceTime=new Random().nextInt(maxRand)+1+Constants.MIN_SERVICE_TIME;
try
{
Thread.sleep(serviceTime);
}
catch(Exception e){}
long time=System.currentTimeMillis()-startTime;
System.out.println(windowName+"为第"+number+"号普通客户服务,花费"+time/1000+"秒");
}
else
{
System.out.println(windowName+"没有获取到任务，休息1秒！");
try
{
Thread.sleep(1000);
}
catch(Exception e){}
}
}
private void ExpressCustomerService()
{
String windowName="第"+windowId+"号"+customerType+"窗口";
System.out.println(windowName+"正在获取任务...");
Integer number=NumberMachine.getInstance().getExpressManager().fetchServiceNumber();
if(number!=null)
{
long startTime=System.currentTimeMillis();
long serviceTime=Constants.MIN_SERVICE_TIME;
try
{
Thread.sleep(serviceTime);
}
catch(Exception e){}
long time=System.currentTimeMillis()-startTime;
System.out.println(windowName+"为第"+number+"号"+customerType+"客户服务,花费"+time/1000+"秒");
}
else
{
System.out.println(windowName+"没有获取到任务");
CommonCustomerService();
}
}
private void VipCustomerService()
{
String windowName="第"+windowId+"号"+customerType+"窗口";
System.out.println(windowName+"正在获取任务...");
Integer number=NumberMachine.getInstance().getVipManager().fetchServiceNumber();
if(number!=null)
{
long startTime=System.currentTimeMillis();
int maxRand=Constants.MAX_SERVICE_TIME-Constants.MIN_SERVICE_TIME;
long serviceTime=new Random().nextInt(maxRand)+1+Constants.MIN_SERVICE_TIME;
try
{
Thread.sleep(serviceTime);
}
catch(Exception e){}
long time=System.currentTimeMillis()-startTime;
System.out.println(windowName+"为第"+number+"号"+customerType+"客户服务,花费"+time/1000+"秒");
}
else
{
System.out.println(windowName+"没有获取到任务");
CommonCustomerService();
}
}
}
5、Program类，根据客户间隔时间，创建新的客户号码；创建服务窗口为客户服务。
public class Program
{
public static void main(String[] args)
{
for(int i=0;i<4;i++)
{
ServiceWindow commonWindow=new ServiceWindow();
commonWindow.setCustomerType(CustomerType.COMMON);
commonWindow.setWindowId(i+1);
commonWindow.start();
}
ServiceWindow expressWindow=new ServiceWindow();
expressWindow.setCustomerType(CustomerType.EXPRESS);
expressWindow.setWindowId(5);
expressWindow.start();
ServiceWindow vipWindow=new ServiceWindow();
vipWindow.setCustomerType(CustomerType.VIP);
vipWindow.setWindowId(6);
vipWindow.start();
Executors.newScheduledThreadPool(1).scheduleAtFixedRate(
new Runnable()
{
public void run()
{
Integer number=NumberMachine.getInstance().getCommonManager().generateNumber();
System.out.println("第"+number+"号普通客户等待服务");
}
},
0,
Constants.COMMON_CUSTOMER_INTERVAL_TIME,
TimeUnit.SECONDS);
Executors.newScheduledThreadPool(1).scheduleAtFixedRate(
new Runnable()
{
public void run()
{
Integer number=NumberMachine.getInstance().getExpressManager().generateNumber();
System.out.println("第"+number+"号快速客户等待服务");
}
},
0,
Constants.EXPRESS_CUSTOMER_INTERVAL_TIME,
TimeUnit.SECONDS);
Executors.newScheduledThreadPool(1).scheduleAtFixedRate(
new Runnable()
{
public void run()
{
Integer number=NumberMachine.getInstance().getVipManager().generateNumber();
System.out.println("第"+number+"号VIP客户等待服务");
}
},
0,
Constants.VIP_CUSTOMER_INTERVAL_TIME,
TimeUnit.SECONDS);
}
}
