成都模板网建站,建设项目安监备案网站,住房与城市建设部网站,外贸建站教程一、概述 ReentrantReadWriteLock是ReadWriteLock的一个子类#xff0c;具有读锁和写锁的双重功能#xff0c;通常用于做缓存。 二、案例代码
2.1、ReentrantReadWriteLockCache
/*** Author : 一叶浮萍归大海* Date: 2023/11/20 17:57* Description: 使用ReentrantReadWri…一、概述 ReentrantReadWriteLock是ReadWriteLock的一个子类具有读锁和写锁的双重功能通常用于做缓存。 二、案例代码
2.1、ReentrantReadWriteLockCache
/*** Author : 一叶浮萍归大海* Date: 2023/11/20 17:57* Description: 使用ReentrantReadWriteLock实现缓存的功能*/
public class ReentrantReadWriteLockCache {private volatile MapString, Object map new HashMap();private ReadWriteLock rwLock new ReentrantReadWriteLock();/*** 写数据* param key* param value*/public void put(String key, Object value) {rwLock.writeLock().lock();try {System.out.println(Thread.currentThread().getName() \t正在写 key);// 线程休眠单位毫秒try {TimeUnit.MILLISECONDS.sleep(300);} catch (Exception e) {e.printStackTrace();}map.put(key, value);System.out.println(Thread.currentThread().getName() \t写完了 key);System.out.println();} catch (Exception e) {e.printStackTrace();} finally {rwLock.writeLock().unlock();}}/*** 读数据* param key* return*/public Object get(String key) {rwLock.readLock().lock();Object result null;try {System.out.println(Thread.currentThread().getName() \t正在读 key);// 线程休眠单位毫秒try {TimeUnit.MILLISECONDS.sleep(300);} catch (Exception e) {e.printStackTrace();}result map.get(key);System.out.println(Thread.currentThread().getName() \t读完了 result);} catch (Exception e) {e.printStackTrace();} finally {rwLock.readLock().unlock();}return result;}
}
2.2、ReentrantReadWriteLockMainApp
/*** Author : 一叶浮萍归大海* Date: 2023/11/20 18:00* Description:*/
public class ReentrantReadWriteLockMainApp {public static void main(String[] args) {ReentrantReadWriteLockCache cache new ReentrantReadWriteLockCache();for (int i 1; i 5; i) {final int number i;new Thread(() - {try {cache.put(String.valueOf(number),number);} catch (Exception e) {e.printStackTrace();}}, String.valueOf(i)).start();}for (int i 1; i 5; i) {final int number i;new Thread(() - {try {cache.get(String.valueOf(number));} catch (Exception e) {e.printStackTrace();}}, String.valueOf(i)).start();}}}
