package com.demo.read.write.lock;

import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReadWriteLock;
import java.util.concurrent.locks.ReentrantReadWriteLock;

/**
 * 讀寫鎖案例
 * @author Administrator
 *
 */
public class ReadWriteLockDemo {

    
 
private Map<String, Object> map = new HashMap<String, Object>();
    
    private ReadWriteLock rwLock = new ReentrantReadWriteLock();
    
    private Lock rLock = rwLock.readLock();
    
    private Lock wLock = rwLock.writeLock();
    
    public void put(String key, Object value) throws
 
 InterruptedException {
        wLock.lock();
        System.out.println(Thread.currentThread().getName() + " 寫操作執行了。。。");
        Thread.sleep(1000);
        try {
            map.put(key, value);
        } finally {
            System.out.println(Thread.currentThread().getName() + " 寫操作執行完成了。。。");
            wLock.unlock();
        }
    }
    
    
 
public Object get(String key) throws InterruptedException {
        rLock.lock();
        System.out.println(Thread.currentThread().getName() + " 讀操作執行了。。。");
        Thread.sleep(1000);
        try {
            return map.get(key);
        } finally {
            System.out.println(Thread.currentThread().getName() + " 讀操作執行完成了。。。");
            rLock.unlock();
        }
    }
    
}