黑马程序员 Java 银行业务调度系统

package com.itcast.bank;

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;
}

//要用单例模式所以构造方法私有化
private NumberMachine(){}
//创建静态方法来获取对象
public static NumberMachine getInstance(){
return instance;
}
//因为是静态方法调用所以要静态修饰
private static NumberMachine instance = new NumberMachine();
}

package com.itcast.bank;

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

public class NumberManager {
private Integer lastNumber = 1;
//储存产生的所有号码
private List<Integer> queueNumber = new ArrayList<Integer>();

public synchronized Integer generateNewManager(){
queueNumber.add(lastNumber);
return lastNumber++;
}

public Integer fetchServiceNumber(){
Integer number = null;
if(queueNumber.size()>0)
return queueNumber.remove(0);
return number;
}

}

package com.itcast.bank;

import java.util.Random;
import java.util.concurrent.Executors;

public class ServiceWindow {
private CustomerType type = CustomerType.COMMON;
public int windowId = 1;

public void setType(CustomerType type) {
this.type = type;
}
public void setWindowId(int windowId) {
this.windowId = windowId;
}
//创建各窗口叫号的线程,对教程代码进行了优化，单是偶尔会出现两个窗口同时为一个客户服务的情况，一定线程同步的问题，但还没找到处理方法。
public void start(){
Executors.newSingleThreadExecutor().execute(new Runnable(){
public void run(){
Integer number = null;
while(true){
switch(type){
case COMMON:
number = NumberMachine.getInstance().getCommonManager().fetchServiceNumber();
service(CustomerType.COMMON,number);
break;
case EXPRESS:
number = NumberMachine.getInstance().getExpressManager().fetchServiceNumber();
service(CustomerType.EXPRESS,number);
break;
case VIP:
number = NumberMachine.getInstance().getVipManager().fetchServiceNumber();
service(CustomerType.VIP,number);
break;
}
}
}
});
}
//建立窗口服务的方法。
private void service(CustomerType type,Integer number) {
String windowName = "第" + windowId + "号【"+type+"】 窗口";
System.out.println(windowName + "正在提供服务");
if(number!=null){
System.out.println(windowName + "正在为第（" + number + "）位"+ "【"+type+"】客户服务！");
long beginTime = System.currentTimeMillis();
int maxRand = Constants.MAX_SERVICE_TIME - Constants.MIN_SERVICE_TIME;
long serverTime = new Random().nextInt(maxRand) + 1 + Constants.MIN_SERVICE_TIME;

try {
Thread.sleep(serverTime);
} catch (Exception e) {
e.printStackTrace();
}
long costTime = System.currentTimeMillis() - beginTime;
System.out.println(windowName + "为第（" + number + "）位"+ "【"+type+"】客户完成服务！服务时间为："+ costTime/1000 +"秒");
}else{
System.out.println(windowName + "没有取到任务,喝口茶等1秒！");
try {
Thread.sleep(1000);
} catch (Exception e) {
e.printStackTrace();
}
}
}
}

package com.itcast.bank;

public enum CustomerType {

COMMON,EXPRESS,VIP;

public String toString(){
switch(this){
case COMMON:
return "普通";
case EXPRESS:
return "快速";
case VIP:
return name();
}
return n
4000
ull;
}
}

package com.itcast.bank;

public class Constants {
public static int MAX_SERVICE_TIME = 10000;
public static int MIN_SERVICE_TIME = 1000;

package com.itcast.bank;

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

public class Main {

public static void main(String[] args) {

for (int i=1; i<5; i++){
ServiceWindow commonWindow = new ServiceWindow();
commonWindow.setWindowId(i);
commonWindow.start();
}

ServiceWindow vipWindow = new ServiceWindow();
vipWindow.setType(CustomerType.VIP);
vipWindow.start();

ServiceWindow expressWindow = new ServiceWindow();
expressWindow.setType(CustomerType.EXPRESS);
expressWindow.start();

Executors.newScheduledThreadPool(1).scheduleAtFixedRate(
new Runnable(){
public void run(){
Integer number = NumberMachine.getInstance().getCommonManager().generateNewManager();
System.out.println(number + "号普通客户等待服务");
}
}, 0, 1, TimeUnit.SECONDS);

Executors.newScheduledThreadPool(1).scheduleAtFixedRate(
new Runnable(){
public void run(){
Integer number = NumberMachine.getInstance().getExpressManager().generateNewManager();
System.out.println(number + "号快速客户等待服务");
}
}, 0, 6, TimeUnit.SECONDS);

Executors.newScheduledThreadPool(1).scheduleAtFixedRate(
new Runnable(){
public void run(){
Integer number = NumberMachine.getInstance().getVipManager().generateNewManager();
System.out.println(number + "号VIP客户等待服务");
}
}, 0, 3, TimeUnit.SECONDS);

}

}