黑马程序员银行业务调度-优快云博客

本文链接：https://blog.youkuaiyun.com/focusjava/article/details/8076382

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package cn.itcast.bank;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;
public class MainClass {
public static void main(String[] args) {
int windowNumber;// 窗口编号
/* 创建4个普通窗口 */
for (windowNumber = 1; windowNumber <= 4; windowNumber++) {
new ServiceWindow(CustomerType.GENERAL, windowNumber);
}
new ServiceWindow(CustomerType.FAST, windowNumber++);// 创建1个快速窗口
new ServiceWindow(CustomerType.VIP, windowNumber++);// 创建1个VIP窗口
NumberMachine.getInstance().open();// 打开号码管理器的开关
}
}
/* 服务窗口类 */
class ServiceWindow {
private static NumberMachine numberMachine = NumberMachine.getInstance();// 所有服务窗口共享一个号码管理器
private CustomerType type;// 窗口类型
private int number;// 窗口编号
/**
* @param type
* 窗口类型
* @param number
* 窗口编号
*/
public ServiceWindow(CustomerType type, int number) {
this.number = number;
this.type = type;
Executors.newScheduledThreadPool(1).schedule(new Runnable() {
@Override
public void run() {
Random random = new Random();
do {
/* 向号码管理器索取下一个顾客，如果没有索取到则返回null */
Customer customer = numberMachine.getCustomer(ServiceWindow.this);
if (null == customer) {
System.out.println(ServiceWindow.this.getNumber()
+ "号窗口空闭中");
try {
Thread.sleep(2000);// 窗口休息2秒再进行下一次索取
} catch (InterruptedException e) {
e.printStackTrace();
}
} else {
System.out.println(customer.toString() + "到"
+ ServiceWindow.this.getNumber() + "号窗口办理业务");
try {
Thread.sleep((random.nextInt(19000) + 1000));// 如果索取到了顾客，随机生成为该顾客服务的时间
} catch (InterruptedException e) {
e.printStackTrace();
}
System.out.println(ServiceWindow.this.getNumber()
+ "号窗口为" + customer.toString() + "办理完毕");
}
} while (true);
}
}, 0, TimeUnit.SECONDS);
}
public int getNumber() {
return number;// 返回窗口的的编号
}
public CustomerType getType() {
return type;// 返回窗口的类型
}
}
/* 号码管理器类 */
class NumberMachine {
private int customers = 0;// 客户编号，每来一个顾客，这个编号的值就会增加1
private List<customer> generalList = new ArrayList<customer>();// 普通用户队列
private List<customer> fastList = new ArrayList<customer>();// 快速用户队列
private List<customer> VIPList = new ArrayList<customer>();// VIP用户队列
private static NumberMachine numberMachine = new NumberMachine();// 单例
private boolean onOff = false;// 号码管理器的开关初始状态为关
private NumberMachine() {
}
public static NumberMachine getInstance() {
return numberMachine;
}
public void open() {// 打开开关，让号码管理器开始工作
onOff = true;
Executors.newScheduledThreadPool(1).schedule(new Runnable() {
@Override
public void run() {
Random random = new Random();
while (onOff) {
try {
Thread.sleep((random.nextInt(3) + 1) * 1000);// 随机生成顾客到来的时间间隔
} catch (InterruptedException e) {
e.printStackTrace();
}
switch (random.nextInt(10)) {// VIP客户:快速客户:普通客户=1:3:6
case 0:
/* VIP客户加入到VIP用户队列 */
VIPList.add(new Customer(CustomerType.VIP, ++customers));
System.out.println(VIPList.get(VIPList.size() - 1)
.toString() + "进入VIP用户队列");
break;
case 1:
case 2:
case 3:
/* 快速用户加入到快速用户队列 */
fastList.add(new Customer(CustomerType.FAST,
++customers));
System.out.println(fastList.get(fastList.size() - 1)
.toString() + "进入快速用户队列");
break;
default:
/* 普通用户加入到普通用户队列 */
generalList.add(new Customer(CustomerType.GENERAL,
++customers));
System.out.println(generalList.get(
generalList.size() - 1).toString()
+ "进入普通用户队列");
}
}
}
}, 0, TimeUnit.SECONDS);
}
/* 多个线程都在向号码管理器索取客户，所以要同步，如果不同步可能会出现两个窗口取到同一个客户 */
public synchronized Customer getCustomer(ServiceWindow serviceWindow) {
Customer customer = null;// 取到的客户，初始值为null
switch (serviceWindow.getType()) {
case GENERAL:// 普通窗口在索取
if (0 < generalList.size()) {
customer = generalList.remove(0);
} else if (0 < VIPList.size()) {
customer = VIPList.remove(0);
} else if (0 < fastList.size()) {
customer = fastList.remove(0);
}
break;
case FAST:// 快速窗口在索取
if (0 < fastList.size()) {
customer = fastList.remove(0);
} else if (0 < VIPList.size()) {
customer = VIPList.remove(0);
} else if (0 < generalList.size()) {
customer = generalList.remove(0);
}
break;
case VIP:// VIP窗口在索取
if (0 < VIPList.size()) {
customer = VIPList.remove(0);
} else if (0 < generalList.size()) {
customer = generalList.remove(0);
} else if (0 < fastList.size()) {
customer = fastList.remove(0);
}
}
return customer;// 返回取到的客户
}
public void close() {// 关闭号码管理器
onOff = false;
}
}
class Customer {
private CustomerType type;// 客户类型
private int number;// 客户编号
public Customer(CustomerType type, int number) {
this.type = type;
this.number = number;
}
public String toString() {
switch (type) {
case GENERAL:
return "第" + number + "号普通用户";
case FAST:
return "第" + number + "号快速用户";
case VIP:
return "第" + number + "号VIP用户";
}
return null;
}
public CustomerType getType() {
return type;
}
public void setType(CustomerType type) {
this.type = type;
}
public int getNumber() {
return number;
}
public void setNumber(int number) {
this.number = number;
}
}
/* 3种不同的服务类型 */
enum CustomerType {
GENERAL, FAST, VIP
};
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