黑马程序员_12月22日

----------------------android培训、java培训、期待与您交流！ ----------------------

银行业务调度

1、对象抽象：
号码管理机（“生成”客户）-->单例
号码管理类
窗口


2、代码实现
public class NumberManager {  //每类客户一个号码管理
private int lastNumber = 0;
private List queueNumbers = new ArrayList();  //排队者：队列
//因为有多个线程访问这两个方法，所以要注意同步
public synchronized Integer generateNewNumber(){
queueNumbers.add(++lastNumber);
return lastNumber;
}

public synchronized Integer fetchNumber(){
if(queueNumbers.size()>0){  //还有客户在等待
return (Integer)queueNumbers.remove(0);
}else{
return null;
}
}
}


public class NumberMachine {

private NumberMachine(){}
private static NumberMachine instance = new NumberMachine();  //实现单例
public static NumberMachine getInstance(){
return instance;
}

private NumberManager commonManager = new NumberManager();
private NumberManager expressManager = new NumberManager();
private NumberManager vipManager = new NumberManager();
public NumberManager getCommonManager() { //只能获得。
return commonManager;
}
public NumberManager getExpressManager() {
return expressManager;
}
public NumberManager getVipManager() {
return vipManager;
}

}


/**
 * 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。
 * */
public class ServiceWindow {  //服务窗口类，每个窗口一个类。
private CustomerType type = CustomerType.COMMON;  //CustomerType是一个枚举类。
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(){  //实现多线程
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(){
String windowName = "第" + number + "号" + type + "窗口";
System.out.println(windowName + "开始获取普通任务!");
Integer serviceNumber = NumberMachine.getInstance().getCommonManager().fetchNumber();
if(serviceNumber != null ){ //是否有相关用户在等待服务？
      //这里必须写“普通客户”，因为type可能值有3个，这里仅能为普通服务。
System.out.println(windowName + "开始为第" + serviceNumber + "号普通客户服务");
//随机化服务时间
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);  //模拟服务过程
} catch (InterruptedException e) {
e.printStackTrace();
}
System.out.println(windowName + "完成为第" + serviceNumber + "号普通客户服务，总共耗时" + serviceTime/1000 + "秒");
}else{
System.out.println(windowName + "没有取到普通任务，正在空闲一秒");
try {
Thread.sleep(1000);   //模拟空闲
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}

private void expressService(){
Integer serviceNumber = NumberMachine.getInstance().getExpressManager().fetchNumber();
String windowName = "第" + number + "号" + type + "窗口";
System.out.println(windowName + "开始获取快速任务!");
if(serviceNumber !=null){
System.out.println(windowName + "开始为第" + serviceNumber + "号快速客户服务");
int serviceTime = Constants.MIN_SERVICE_TIME;
try {
Thread.sleep(serviceTime);
} catch (InterruptedException e) {
e.printStackTrace();
}
System.out.println(windowName + "完成为第" + serviceNumber + "号快速客户服务，总共耗时" + serviceTime/1000 + "秒");
}else{
System.out.println(windowName + "没有取到快速任务！");
commonService();  //没有取到任务，则转向普通客户服务。
}
}

private void vipService(){


Integer serviceNumber = NumberMachine.getInstance().getVipManager().fetchNumber();
String windowName = "第" + number + "号" + type + "窗口";
System.out.println(windowName + "开始获取VIP任务!");
if(serviceNumber !=null){
System.out.println(windowName + "开始为第" + serviceNumber + "号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();
}
System.out.println(windowName + "完成为第" + serviceNumber + "号VIP客户服务，总共耗时" + serviceTime/1000 + "秒");
}else{
System.out.println(windowName + "没有取到VIP任务！");
commonService();
}
}
}


public class MainClass {


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();
System.out.println("第" + serviceNumber + "号普通客户正在等待服务！");
}
},
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();
System.out.println("第" + serviceNumber + "号快速客户正在等待服务！");
}
},
0,
Constants.COMMON_CUSTOMER_INTERVAL_TIME * 2,//间隔时间长，模拟频率低，概率小
TimeUnit.SECONDS);

//VIP客户拿号
Executors.newScheduledThreadPool(1).scheduleAtFixedRate(
new Runnable(){
public void run(){
Integer serviceNumber = NumberMachine.getInstance().getVipManager().generateNewNumber();
System.out.println("第" + serviceNumber + "号VIP客户正在等待服务！");
}
},
0,
Constants.COMMON_CUSTOMER_INTERVAL_TIME * 6, 
TimeUnit.SECONDS);
}

}

---------------------- android培训、java培训、期待与您交流！ ----------------------

详细请查看：http://edu.csdn.net/heima