054 redisson

文章目录

- 使用Redisson演示可重入锁
- 读写锁
- 信号量
- 闭锁
- 获取三级分类redisson分布式锁

package com.xd.cubemall.product.config;import org.redisson.Redisson;
import org.redisson.api.RedissonClient;
import org.redisson.config.Config;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;@Configuration
public class MyRedissonConfig {/*** 注册RedissonClient对象*/@Bean(destroyMethod="shutdown")RedissonClient redissonClient(){Config config = new Config();config.useSingleServer().setAddress("redis://127.0.0.1:6379");RedissonClient redissonClient = Redisson.create(config);return redissonClient;}}

使用Redisson演示可重入锁

    /*** 使用Redisson演示可重入锁* @return*/@ResponseBody@GetMapping("/hello")public String hello(){//获取一把锁RLock lock = redissonClient.getLock("my-lock");//加锁lock.lock();try{System.out.println("加锁成功，执行业务。。。" + Thread.currentThread().getId());Thread.sleep(10000);} catch (Exception e) {e.printStackTrace();} finally {//解锁System.out.println("解锁。。。" + Thread.currentThread().getId());lock.unlock();}return "hello";}

读写锁

    @GetMapping("/write")@ResponseBodypublic String writeValue(){//获取一把锁RReadWriteLock lock = redissonClient.getReadWriteLock("rw-lock");// 加 写锁String s = "";RLock writeLock = lock.writeLock();try{//1.改数据加 写锁，读数据加 读锁writeLock.lock();System.out.println("写锁加锁成功..." + Thread.currentThread().getId());s = UUID.randomUUID().toString();Thread.sleep(15000);redisTemplate.opsForValue().set("writeValue",s);} catch (Exception e) {e.printStackTrace();} finally {// 释放锁writeLock.unlock();System.out.println("写锁。。释放。。"+Thread.currentThread().getId());}return s;}@GetMapping("/read")@ResponseBodypublic String readValue(){RReadWriteLock lock = redissonClient.getReadWriteLock("rw-lock");String s = "";//加 读锁RLock readLock = lock.readLock();readLock.lock();try {System.out.println("读锁...加锁成功..."+Thread.currentThread().getId());s = redisTemplate.opsForValue().get("writeValue");} catch (Exception e) {e.printStackTrace();} finally {readLock.unlock();System.out.println("读锁。。释放。。。"+Thread.currentThread().getId());}return s;}

信号量

    @GetMapping("/park")@ResponseBodypublic String park() throws InterruptedException {RSemaphore semaphore = redissonClient.getSemaphore("park");//当车位减少为0时，还想获取车位，必须要等go()调用时，释放一个车位，才能进行执行semaphore.acquire();//占有一个车位return "ok";}@GetMapping("/go")@ResponseBodypublic String go() {RSemaphore semaphore = redissonClient.getSemaphore("park");semaphore.release();return "ok";}

闭锁

    @ResponseBody@GetMapping("/lockDoor")public String lockDoor() throws InterruptedException {RCountDownLatch door = redissonClient.getCountDownLatch("door");door.trySetCount(5);door.await();//等待其他闭锁都完成return "关门了";}@ResponseBody@GetMapping("/gogogo/{id}")public String gogogo(@PathVariable("id") Long id) {RCountDownLatch door = redissonClient.getCountDownLatch("door");door.countDown();//计数-1return id + "桌的人都走了。。。";}

获取三级分类redisson分布式锁

@Autowiredprivate RedissonClient redissonClient;/*** 获取三级分类(redisson分布式锁)* @return*/public List<CategoryVo> getCategoryJsonFromWithRedissonLock() {String uuid = UUID.randomUUID().toString();//1.占分布式RLock lock = redissonClient.getLock("CategoryJson-lock");lock.lock();List<CategoryVo> dataFromDb = null;try {dataFromDb = getDataFromDb();} finally {lock.unlock();}return dataFromDb;}