package lock;

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.locks.ReadWriteLock;
import java.util.concurrent.locks.ReentrantReadWriteLock;
public class LockReadWrite {
    



 public static void main(String[] args) {
 //创建并发访问的账户  
 MyCount myCount = new MyCount("95599200901215522", 10000);  
 //创建一个锁对象  
 ReadWriteLock lock = new ReentrantReadWriteLock(false);  
 //创建一个线程池  
 ExecutorService pool = Executors.newFixedThreadPool(2);  
 //创建一些并发访问用户，一个信用卡，存的存，取的取，好热闹啊  
 User u1 = new User("张三", myCount, -4000, lock, false);  
 User u2 = new User("张三他爹", myCount, 6000, lock, false);  
 User u3 = new User("张三他弟", myCount, -8000, lock, false);  
 User u4 = new User("张三", myCount, 800, lock, false);  
 User u5 = new User("张三他爹", myCount, 0, lock, true);  
 //在线程池中执行各个用户的操作  
 pool.execute(u1);  
 pool.execute(u2);  
 pool.execute(u3);  
 pool.execute(u4);  
 pool.execute(u5);  
 //关闭线程池  
 pool.shutdown();  
 }
 }


 class User implements Runnable {
 private String name;                 //用户名  
 private MyCount myCount;         //所要操作的账户  
 private int iocash;                 //操作的金额，当然有正负之分了  
 private ReadWriteLock myLock;                 //执行操作所需的锁对象  
 private boolean ischeck;         //是否查询  

 User(String name, MyCount myCount, int iocash, ReadWriteLock myLock, boolean ischeck) {
 this.name = name;  
 this.myCount = myCount;  
 this.iocash = iocash;  
 this.myLock = myLock;  
 this.ischeck = ischeck;  
 }

 public void run() {
 if (ischeck) {
 //获取读锁  
 myLock.readLock().lock();  
 System.out.println("读：" + name + "正在查询" + myCount + "账户，当前金额为" + myCount.getCash());  
 //释放读锁  
 myLock.readLock().unlock();  
 } else {
 //获取写锁  
 myLock.writeLock().lock();  
 //执行现金业务  
 System.out.println("写：" + name + "正在操作" + myCount + "账户，金额为" + iocash +"，当前金额为" + myCount.getCash());  
 myCount.setCash(myCount.getCash() + iocash);  
 System.out.println("写：" + name + "操作" + myCount + "账户成功，金额为" + iocash +"，当前金额为" + myCount.getCash());  
 //释放写锁  
 myLock.writeLock().unlock();  
 }
 }
 }


 class MyCount {
 private String oid;         //账号  
 private int cash;             //账户余额  

 MyCount(String oid, int cash) {
 this.oid = oid;  
 this.cash = cash;  
 }

 public String getOid() {
 return oid;  
 }

 public void setOid(String oid) {
 this.oid = oid;  
 }

 public int getCash() {
 return cash;  
 }

 public void setCash(int cash) {
 this.cash = cash;  
 }

 @Override
 public String toString() {  
 return "MyCount{" +  
 "oid='" + oid + '\'' +  
 ", cash=" + cash +  
 '}';  
 }  
 }  
/* 写：张三正在操作MyCount{oid='95599200901215522', cash=10000}账户，金额为-4000，当前金额为10000  
 写：张三操作MyCount{oid='95599200901215522', cash=6000}账户成功，金额为-4000，当前金额为6000  
 写：张三他弟正在操作MyCount{oid='95599200901215522', cash=6000}账户，金额为-8000，当前金额为6000  
 写：张三他弟操作MyCount{oid='95599200901215522', cash=-2000}账户成功，金额为-8000，当前金额为-2000  
 写：张三正在操作MyCount{oid='95599200901215522', cash=-2000}账户，金额为800，当前金额为-2000  
 写：张三操作MyCount{oid='95599200901215522', cash=-1200}账户成功，金额为800，当前金额为-1200  
 读：张三他爹正在查询MyCount{oid='95599200901215522', cash=-1200}账户，当前金额为-1200  
 写：张三他爹正在操作MyCount{oid='95599200901215522', cash=-1200}账户，金额为6000，当前金额为-1200  
 写：张三他爹操作MyCount{oid='95599200901215522', cash=4800}账户成功，金额为6000，当前金额为4800  */