基于Redission实现分布式锁

java 复制代码

 <dependency>
            <groupId>org.redisson</groupId>
            <artifactId>redisson-spring-boot-starter</artifactId>
            <version>3.15.0</version>
        </dependency>

java 复制代码

import lombok.extern.slf4j.Slf4j;
import org.redisson.api.RLock;
import org.redisson.api.RedissonClient;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.stereotype.Component;

import java.util.concurrent.TimeUnit;

/**
 * 分布式锁实现基于Redisson

 */
@Slf4j
@Component
public class RedissonLockClient {

    @Autowired
    private RedissonClient redissonClient;

    @Autowired
    private RedisTemplate<String, Object> redisTemplate;

    /**
     * 获取锁
     */
    public RLock getLock(String lockKey) {
        return redissonClient.getLock(lockKey);
    }

    /**
     * 加锁操作
     *
     * @return boolean
     */
    public boolean tryLock(String lockName, long expireSeconds) {
        return tryLock(lockName, 0, expireSeconds);
    }


    /**
     * 加锁操作
     *
     * @return boolean
     */
    public boolean tryLock(String lockName, long waitTime, long expireSeconds) {
        RLock rLock = getLock(lockName);
        boolean getLock = false;
        try {
            getLock = rLock.tryLock(waitTime, expireSeconds, TimeUnit.SECONDS);
            if (getLock) {
                log.info("获取锁成功,lockName={}", lockName);
            } else {
                log.info("获取锁失败,lockName={}", lockName);
            }
        } catch (InterruptedException e) {
            log.error("获取式锁异常，lockName=" + lockName, e);
            getLock = false;
        }
        return getLock;
    }


    public boolean fairLock(String lockKey, TimeUnit unit, int leaseTime) {
        RLock fairLock = redissonClient.getFairLock(lockKey);
        try {
            boolean existKey = existKey(lockKey);
            // 已经存在了，就直接返回
            if (existKey) {
                return false;
            }
            return fairLock.tryLock(3, leaseTime, unit);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        return false;
    }

    public boolean existKey(String key) {
        return redisTemplate.hasKey(key);
    }
    /**
     * 锁lockKey
     *
     * @param lockKey
     * @return
     */
    public RLock lock(String lockKey) {
        RLock lock = getLock(lockKey);
        lock.lock();
        return lock;
    }

    /**
     * 锁lockKey
     *
     * @param lockKey
     * @param leaseTime
     * @return
     */
    public RLock lock(String lockKey, long leaseTime) {
        RLock lock = getLock(lockKey);
        lock.lock(leaseTime, TimeUnit.SECONDS);
        return lock;
    }


    /**
     * 解锁
     *
     * @param lockName 锁名称
     */
    public void unlock(String lockName) {
        try {
            redissonClient.getLock(lockName).unlock();
        } catch (Exception e) {
            log.error("解锁异常，lockName=" + lockName, e);
        }
    }


}

java 复制代码

@Configuration
public class RedissonConfig {
 
    @Value("${spring.redis.host}")
    private String host;
 
    @Value("${spring.redis.port}")
    private String port;
 
    @Bean
    public RedissonClient getRedisson(){
 
        Config config = new Config();
        //单机模式  依次设置redis地址和密码
        config.useSingleServer().
                setAddress("redis://" + host + ":" + port);
        return Redisson.create(config);
    }
}