黑马程序员--Java 7K面试题之银行调度系统

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1.银行调度系统：

1.业务需求：

银行业务调度系统

模拟实现银行业务调度系统逻辑，具体需求如下：

Ø 银行内有6个业务窗口，1 - 4号窗口为普通窗口，5号窗口为快速窗口，6号窗口为VIP窗口。

Ø 有三种对应类型的客户：VIP客户，普通客户，快速客户（办理如交水电费、电话费之类业务的客户）。

Ø 异步随机生成各种类型的客户，生成各类型用户的概率比例为：

        VIP客户 ：普通客户 ：快速客户  =  1 ：6 ：3。

Ø 客户办理业务所需时间有最大值和最小值，在该范围内随机设定每个VIP客户以及普通客户办理业务所需的时间，快速客户办理业务所需时间为最小值（提示：办理业务的过程可通过线程Sleep的方式模拟）。

Ø 各类型客户在其对应窗口按顺序依次办理业务。 

Ø 当VIP（6号）窗口和快速业务（5号）窗口没有客户等待办理业务的时候，这两个窗口可以处理普通客户的业务，而一旦有对应的客户等待办理业务的时候，则优先处理对应客户的业务。

Ø 随机生成客户时间间隔以及业务办理时间最大值和最小值自定，可以设置。

Ø 不要求实现GUI，只考虑系统逻辑实现，可通过Log方式展现程序运行结果。

2.分析需求

需要一个号码管理、一个取号机器、一个窗口服务，所以建立   NumberManager类、NumberMachine类、ServiceWindow类，关系如下：

一个取号机器上要包含3个取号机制，既普通客户的取号、快速客户的取号、VIP客户的取号

根据需要，必须将NumberMachine设定为单例模式类。

3.代码

import java.util.List;
import java.util.ArrayList;

public class NumberManager {
	
	private int lastNumber = 1;
	private List queueNumber = new ArrayList();
	public synchronized Integer generateNewManager(){
		queueNumber.add(lastNumber);
		return lastNumber++;
	}
	public synchronized Integer fetchServiceNumber(){
		if(queueNumber.size()>0)
			return queueNumber.remove(0);
		return null;
	}
	
}

public class 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(){}
	private static NumberMachine instance = new NumberMachine();
	public static NumberMachine getInstance(){
		return instance;
	}
}

import java.util.Random;
import java.util.concurrent.Executors;
public class ServiceWindow {
	private CustomerType type = CustomerType.COMMON;
	private int windowId = 1;
	public void setType(CustomerType type) {
		this.type = type;
	}
	public void setWindowId(int windowId) {
		this.windowId = windowId;
	}

	public void start(){
		Executors.newSingleThreadExecutor().execute(new Runnable() {
			
			@Override
			public void run() {
				// TODO Auto-generated method stub
				while(true){
					switch (type) {
					case COMMON:
						CommonService();
						break;
					case EXPRESS:
						ExpressService();
						break;
					case VIP:
						VipService();
						break;
					}
				}
			}

		});
	}
	public void CommonService() {
		String  windowName = "第"+windowId+"个"+type+"窗口";
		Integer num = NumberMachine.getInstance().getCommonManager().fetchServiceNumber();
		System.out.println(windowName+"正在获取服务");
		if(num!=null){
			System.out.println(windowName+"为第"+num+"个"+"普通"+"客户服务");
			long beginTime = System.currentTimeMillis();
			int maxRandTime = ConsStants.MAX_SERVICE_TIME - ConsStants.MIN_SERVICE_TIME;
			long serverTime = new Random().nextInt(maxRandTime)+1+ConsStants.MIN_SERVICE_TIME;
			try {
				Thread.sleep(serverTime);
			} catch (InterruptedException e) {
				e.printStackTrace();
			}
			long costTime = System.currentTimeMillis()-beginTime;
			System.out.println(windowName+"为第"+num+"个"+"普通"+"客户完成服务，耗时:"+costTime/1000+"秒");
				
		}else{
			System.out.println(windowName+"没有取到到服务，先休息一秒钟");
			try {
				Thread.sleep(1000);
			} catch (InterruptedException e) {
				e.printStackTrace();
			}
		}
	}
	public void ExpressService() {
		String  windowName = "第"+windowId+"个"+type+"窗口";
		Integer num = NumberMachine.getInstance().getExpressManager().fetchServiceNumber();
		System.out.println(windowName+"正在获取服务");
		if(num!=null){
			System.out.println(windowName+"为第"+num+"个"+type+"客户服务");
			long beginTime = System.currentTimeMillis();
			//int maxRandTime = ConsStants.MAX_SERVICE_TIME - ConsStants.MIN_SERVICE_TIME;
			//long serverTime = new Random().nextInt(maxRandTime)+1+ConsStants.MIN_SERVICE_TIME;
			try {
				Thread.sleep(1000);
			} catch (InterruptedException e) {
				e.printStackTrace();
			}
			long costTime = System.currentTimeMillis()-beginTime;
			System.out.println(windowName+"为第"+num+"个"+type+"客户完成服务，耗时:"+costTime/1000+"秒");
				
		}else{
			System.out.println(windowName+"没有取到到服务，先休息一秒钟");
			CommonService();
			try {
				Thread.sleep(1000);
			} catch (InterruptedException e) {
				e.printStackTrace();
			}
		}
	}
	public void VipService() {
		String  windowName = "第"+windowId+"个"+type+"窗口";
		Integer num = NumberMachine.getInstance().getVipManager().fetchServiceNumber();
		System.out.println(windowName+"正在获取服务");
		if(num!=null){
			System.out.println(windowName+"为第"+num+"个"+type+"客户服务");
			long beginTime = System.currentTimeMillis();
			int maxRandTime = ConsStants.MAX_SERVICE_TIME - ConsStants.MIN_SERVICE_TIME;
			long serverTime = new Random().nextInt(maxRandTime)+1+ConsStants.MIN_SERVICE_TIME;
			try {
				Thread.sleep(serverTime);
			} catch (InterruptedException e) {
				e.printStackTrace();
			}
			long costTime = System.currentTimeMillis()-beginTime;
			System.out.println(windowName+"为第"+num+"个"+type+"客户完成服务，耗时:"+costTime/1000+"秒");
				
		}else{
			System.out.println(windowName+"没有取到到服务");
			CommonService();
			try {
				Thread.sleep(1000);
			} catch (InterruptedException e) {
				e.printStackTrace();
			}
		}
	}
	
}

其他类：

public enum CustomerType {
	COMMON,EXPRESS,VIP;
	@Override
	public String toString() {
		// TODO Auto-generated method stub
		switch (this) {
		case COMMON:
			return "普通";
		case EXPRESS:
			return "快速";
		case VIP:
			return name();
		}
		return null;
	}
}

public class ConsStants {
	public static int MAX_SERVICE_TIME = 10000;
	public static int MIN_SERVICE_TIME = 1000;
	
}

调用方法：

import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;

public class mainClass {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		for (int i = 1; i <= 5; i++) {
			ServiceWindow commonwindow = new ServiceWindow();
			commonwindow.setWindowId(i);
			commonwindow.start();
		}
		
		ServiceWindow vipwindow = new ServiceWindow();
		vipwindow.setWindowId(7);
		vipwindow.setType(CustomerType.VIP);
		vipwindow.start();
		
		ServiceWindow expresswindow = new ServiceWindow();
		expresswindow.setWindowId(6);
		expresswindow.setType(CustomerType.EXPRESS);
		expresswindow.start();
		
		Executors.newScheduledThreadPool(1).scheduleAtFixedRate(
				new Runnable() {
					
					@Override
					public void run() {
						// TODO Auto-generated method stub
						Integer num = NumberMachine.getInstance().getCommonManager().generateNewManager();
						System.out.println("第"+num+"号普通客户等待服务");
					}
				}, 
				0, 
				1, 
				TimeUnit.SECONDS
			);
		Executors.newScheduledThreadPool(1).scheduleAtFixedRate(
				new Runnable() {
					
					@Override
					public void run() {
						// TODO Auto-generated method stub
						Integer num = NumberMachine.getInstance().getVipManager().generateNewManager();
						System.out.println("第"+num+"号VIP客户等待服务");
					}
				}, 
				0, 
				6, 
				TimeUnit.SECONDS
			);
		Executors.newScheduledThreadPool(1).scheduleAtFixedRate(
				new Runnable() {
					
					@Override
					public void run() {
						// TODO Auto-generated method stub
						Integer num = NumberMachine.getInstance().getExpressManager().generateNewManager();
						System.out.println("第"+num+"号快速客户等待服务");
					}
				}, 
				0, 
				3, 
				TimeUnit.SECONDS
			);
	}

}