java中redissonClient 分布式鎖的使用

更新時(shí)間：2024年03月03日 10:54:05 作者：努力提升的菜鳥(niǎo)程序員

在集群的情況下,用戶多次請(qǐng)求接口時(shí),存入的內(nèi)容可能會(huì)導(dǎo)致重復(fù),這時(shí)候就可以使用分布式鎖來(lái)限制,本文就來(lái)介紹一下java中redissonClient 分布式鎖的使用,感興趣的可以了解一下

適用場(chǎng)景

分布式應(yīng)用，分布式緩存，分布式回話管理，分布式服務(wù)（任務(wù)，延遲任務(wù)，執(zhí)行器），分布式redis客戶端

第一步：導(dǎo)入依賴

<!-- redis 分布式鎖框架 -->
		<dependency>
			<groupId>org.redisson</groupId>
			<artifactId>redisson</artifactId>
			<version>3.12.5</version>
		</dependency>

第二步：配置連接redis

程序化配置方法

Config config = new Config();
//存放在哪個(gè)服務(wù)器的redisIP地址加redis端口號(hào)
config. useSingleServer().setAddress("127.0.0.1:6379");
RedissonClient redisson = Redisson.create(config);

驗(yàn)證是否連接成功

redisson.getConfig().toJSON().toString()

結(jié)果

{"singleServerConfig":{"idleConnectionTimeout":10000,"pingTimeout":1000,"connectTimeout":10000,"timeout":3000,"retryAttempts":3,"retryInterval":1500,"reconnectionTimeout":3000,"failedAttempts":3,"subscriptionsPerConnection":5,"address":"redis://127.0.0.1:6379","subscriptionConnectionMinimumIdleSize":1,"subscriptionConnectionPoolSize":50,"connectionMinimumIdleSize":10,"connectionPoolSize":64,"database":0,"dnsMonitoring":false,"dnsMonitoringInterval":5000},"threads":0,"nettyThreads":0,"codec":{"class":"org.redisson.codec.JsonJacksonCodec"},"codecProvider":{"class":"org.redisson.codec.DefaultCodecProvider"},"resolverProvider":{"class":"org.redisson.liveobject.provider.DefaultResolverProvider"},"redissonReferenceEnabled":true,"useLinuxNativeEpoll":false}

測(cè)試寫法

public class LockExamples {
    public static void main(String[] args) throws InterruptedException {
        // 默認(rèn)連接上127.0.0.1:6379
        RedissonClient client = Redisson.create();
        // RLock 繼承了 java.util.concurrent.locks.Lock 接口
        RLock lock = client.getLock("lock");

        lock.lock();
        System.out.println("lock acquired");

        Thread t = new Thread(() -> {
            //獲取鎖，傳入要鎖的key
            RLock lock1 = client.getLock("lock");
            //獲取鎖
            lock1.lock();
            System.out.println("lock acquired by thread");
            //解鎖
            lock1.unlock();
            System.out.println("lock released by thread");
        });

        t.start();
        t.join(1000);
        
        lock.unlock();
        System.out.println("lock released");

        t.join();

        client.shutdown();
    }
}

飛花令的寫法

    @Override
    @Transactional(rollbackFor = Exception.class)
    public FlyingFlowerV1Vo insert(FlyingFlowerReq flyingFlowerReq, String userId) throws Exception {
        //對(duì)進(jìn)來(lái)的用戶加鎖
        RLock userLock = redissonClient.getLock(RedissonKey.USER_ID + userId);
        try{
            //嘗試加鎖, 最多等待1秒, 1000秒后自動(dòng)解鎖
            boolean getUserLock = userLock.tryLock(1, 1000, TimeUnit.MILLISECONDS);
            if (getUserLock) {
                //業(yè)務(wù)邏輯的代碼，通常在插入修改的操作方法上進(jìn)行加鎖
        }catch (Exception e){
            //提示
            System.out.println("接令頻繁"+ userId);
            throw new ResultInfo(ResultUtils.error("接令頻繁，請(qǐng)稍后再試"));
        }finally {
            //解鎖
            if (userLock.isLocked()) {
                if (userLock.isHeldByCurrentThread()) {
                    userLock.unlock();
                }
            }
        }
        return null;
    }

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