ReentrantReadWriteLock （ReadWriteLock）
加读写锁；是为了多条线程可以同时读取，写的时候只能允许只有一条线程进行写入操作。
package com.baidu.ReadWriteLock;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.locks.ReadWriteLock;
import java.util.concurrent.locks.ReentrantLock;
import java.util.concurrent.locks.ReentrantReadWriteLock;
public class ReadWriteLockDemo {
public static void main(String[] args) {
//MyCache myCache = new MyCache(); //读写乱套,
MyCacheLock myCache = new MyCacheLock();
for (int i = 1; i <= 5; i++) {
final int temp = i;
new Thread(()->{
myCache.put(temp+"",temp+"");
},String.valueOf(i)).start();
}
for (int i = 1; i <= 5; i++) {
final int temp = i;
new Thread(()->{
myCache.get(temp+"");
},String.valueOf(i)).start();
}
}
}
class MyCacheLock{
public volatile Map<String,Object> map = new HashMap<>();
//读写锁
private ReadWriteLock readWriteLock = new ReentrantReadWriteLock();
//存,,写入操作
public void put(String key,Object value){
readWriteLock.writeLock().lock();
try {
System.out.println(Thread.currentThread().getName()+"写入"+key);
map.put(key, value);
System.out.println(Thread.currentThread().getName()+"写入OK");
} catch (Exception e) {
e.printStackTrace();
} finally {
readWriteLock.writeLock().unlock();
}
}
//取,读取操作
public void get(String key){
readWriteLock.readLock().lock();
try {
System.out.println(Thread.currentThread().getName()+"读取"+key);
map.get(key);
System.out.println(Thread.currentThread().getName()+"读取OK"+key);
} catch (Exception e) {
e.printStackTrace();
} finally {
readWriteLock.readLock().unlock();
}
}
}
//自定义缓存;
class MyCache{
public volatile Map<String,Object> map = new HashMap<>();
//存,,写入操作
public void put(String key,Object value){
System.out.println(Thread.currentThread().getName()+"写入"+key);
map.put(key, value);
System.out.println(Thread.currentThread().getName()+"写入OK");
}
//取,读取操作
public void get(String key){
System.out.println(Thread.currentThread().getName()+"读取"+key);
map.get(key);
System.out.println(Thread.currentThread().getName()+"读取OK"+key);
}
}
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