springboot项目中Redisson RLock分布式锁的使用

Redisson框架实现了redis的分布式锁功能， 实际项目使用时直接使用Redisson框架的RLock锁即可

创建springboot redis项目
springboot-redis-demo

添加依赖包

<dependency>
    <groupId>org.redisson</groupId>
    <artifactId>redisson-spring-boot-starter</artifactId>
    <version>3.12.5</version>
</dependency>

添加redisson配置项redisson.yml

singleServerConfig:
  password: 111111
  address: "redis://127.0.0.1:6379"
  database: 0

创建redisson配置类

import org.redisson.Redisson;
import org.redisson.api.RedissonClient;
import org.redisson.config.Config;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframework.core.io.ClassPathResource;
import java.io.IOException;

@Configuration
public class RedssonConfig {

    @Primary
    @Bean(name = "redissonClient")
    public RedissonClient redissonClient() throws IOException {
        return Redisson.create(Config.fromYAML(new ClassPathResource("redisson-single.yml").getInputStream()));
    }

    @Bean(destroyMethod = "shutdown")
    public RedissonClient shutdown(@Qualifier("redissonClient") RedissonClient redissonClient) {
        return redissonClient;
    }
}

创建RDistributedLockerUtil工具类

import org.redisson.api.RLock;
import org.redisson.api.RedissonClient;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Component;
import java.util.concurrent.TimeUnit;

@Component
public class RedissonLockerUtil {

    // RedissonClient已经由配置类生成，这里自动装配即可
    private RedissonClient redissonClient;

    @Autowired
    private RedissonLockerUtil(@Qualifier("redissonClient") RedissonClient redissonClient) {
        this.redissonClient = redissonClient;
    }

    /**
     * lock(), 拿不到lock就不罢休，不然线程就一直block
     *
     * @param lockKey
     * @return
     */
    public RLock lock(String lockKey) {
        RLock lock = redissonClient.getLock(lockKey);
        lock.lock();
        return lock;
    }

    /**
     * leaseTime为加锁时间，单位为秒
     *
     * @param lockKey
     * @param leaseTime
     * @return
     */
    public RLock lock(String lockKey, long leaseTime) {
        RLock lock = redissonClient.getLock(lockKey);
        lock.lock(leaseTime, TimeUnit.SECONDS);
        return null;
    }

    /**
     * timeout为加锁时间，时间单位由unit确定
     *
     * @param lockKey
     * @param unit
     * @param timeout
     * @return
     */
    public RLock lock(String lockKey, TimeUnit unit, long timeout) {
        RLock lock = redissonClient.getLock(lockKey);
        lock.lock(timeout, unit);
        return lock;
    }

    public boolean tryLock(String lockKey, TimeUnit unit, long waitTime, long leaseTime) {
        RLock lock = redissonClient.getLock(lockKey);
        try {
            return lock.tryLock(waitTime, leaseTime, unit);
        } catch (InterruptedException e) {
            return false;
        }
    }

    public void unlock(String lockKey) {
        RLock lock = redissonClient.getLock(lockKey);
        lock.unlock();
    }

    public void unlock(RLock lock) {
        lock.unlock();
    }

    public void shutdown() {
        redissonClient.shutdown();
    }
}

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