redisson分布式锁实现方式

在当下分布式开发中，分布式锁的应用非常频繁，也非常重要，所以下面根据我们实际操作，实现一下redisson的分布式锁。

1、引入maven包

powershell 复制代码

 
<!--redis-->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-redis</artifactId>
    <version>4.0.0</version>
</dependency>

<dependency>
    <groupId>org.redisson</groupId>
    <artifactId>redisson</artifactId>
    <version>3.16.3</version>
</dependency>

2、实现

创建获取分布式锁的工厂类interface

java 复制代码

public interface DistributedLockFactory {

    /**
     * 根据key获取分布式锁
     */
    DistributedLock getDistributedLock(String key);
}

基于Redisson的分布式锁实现服务

powershell 复制代码

@Component
public class RedissonLockFactory implements DistributedLockFactory {
    private final Logger logger = LoggerFactory.getLogger(RedissonLockFactory.class);

    @Autowired
    private RedissonClient redissonClient;

    @Override
    public DistributedLock getDistributedLock(String key) {
        RLock rLock = redissonClient.getLock(key);
        return new DistributedLock() {
            @Override
            public boolean tryLock(long waitTime, long leaseTime, TimeUnit unit) throws InterruptedException {
                boolean isLockSuccess = rLock.tryLock(waitTime, leaseTime, unit);
                logger.info("{} get lock result:{}", key, isLockSuccess);
                return isLockSuccess;
            }

            @Override
            public void lock(long leaseTime, TimeUnit unit) {
                rLock.lock(leaseTime, unit);
            }

            @Override
            public void unlock() {
                if (isLocked() && isHeldByCurrentThread()) {
                    rLock.unlock();
                }
            }
            @Override
            public boolean isLocked() {
                return rLock.isLocked();
            }

            @Override
            public boolean isHeldByThread(long threadId) {
                return rLock.isHeldByThread(threadId);
            }

            @Override
            public boolean isHeldByCurrentThread() {
                return rLock.isHeldByCurrentThread();
            }
        };
    }
}

创建RedissonConfig配置类

下面可以设置配置文件去配置单节点还是集群节点实例化RedissonClient

java 复制代码

@Configuration
@ConditionalOnProperty(name = "distributed.lock.type", havingValue = "redisson")
public class RedissonConfig {

    @Value("${spring.redis.address}")
    private String redisAddress;

    @Bean(name = "redissonClient")
    @ConditionalOnProperty(name = "redis.arrange.type", havingValue = "single")
    public RedissonClient singleRedissonClient() {
        Config config = new Config();
        config.useSingleServer().setAddress(redisAddress).setDatabase(0);
        return Redisson.create(config);
    }

    @Bean(name = "redissonClient")
    @ConditionalOnProperty(name = "redis.arrange.type", havingValue = "cluster")
    public RedissonClient clusterRedissonClient(){
        Config config = new Config();
        ClusterServersConfig clusterServersConfig = config.useClusterServers();
        clusterServersConfig.setNodeAddresses(Arrays.asList(redisAddress));
        return Redisson.create(config);
    }
}

配置文件

powershell 复制代码

# redisson
distributed.lock.type=redisson

#single/cluster
redis.arrange.type=single