redis分布式锁redisson

@Configuration
public class RedissonConfig {
  @Bean
  public Redisson redisson(){
        Config config = new Config();
        //单机版
        config.useSingleServer().setAddress("redis://192.168.56.102:8001").setDatabase(0);
        //集群版
        //config.useClusterServers().addNodeAddress("");
        return (Redisson) Redisson.create(config);
    }
}

//redisson使用
  @Resource
    private Redisson redisson;


    public void test(){
        String lockKey = "lock:product_1001";
        RLock lock = redisson.getLock(lockKey);
        //加锁
        lock.lock();
        try{
            //业务逻辑
        }catch (Exception e){

        }finally {
            //释放锁
            lock.unlock();
        }
    }

public void lockInterruptibly(long leaseTime, TimeUnit unit) throws InterruptedException {
        long threadId = Thread.currentThread().getId();
        Long ttl = this.tryAcquire(leaseTime, unit, threadId);
        if (ttl != null) {
            //订阅消息，当锁释放后，唤醒睡眠的线程
            RFuture<RedissonLockEntry> future = this.subscribe(threadId);
            this.commandExecutor.syncSubscription(future);

            try {
               
                while(true) {
                    ttl = this.tryAcquire(leaseTime, unit, threadId);
                    //加锁成功会返回null
                    if (ttl == null) {
                        return;
                    }
          //返回锁剩余的超时时间，按照这个时间去休眠
                    if (ttl >= 0L) {
                        //根据信号量会阻塞ttl时间
                        //这里如果线程主动释放了锁？但是获取的ttl时间未到，那剩下的线程都会等着吗？
                        //有休眠就会有唤醒逻辑。在unlock逻辑里面有发布订阅模式，当锁释放后，会发布消息。
                        this.getEntry(threadId).getLatch().tryAcquire(ttl, TimeUnit.MILLISECONDS);
                    } else {
                        //重新去获取一次锁
                        this.getEntry(threadId).getLatch().acquire();
                    }
                }
            } finally {
                this.unsubscribe(future, threadId);
            }
        }
    }

return this.commandExecutor.evalWriteAsync(this.getName(), LongCodec.INSTANCE, command,
                "if (redis.call('exists', KEYS[1]) == 0) " + //如果当前key不存在
                        "then redis.call('hset', KEYS[1], ARGV[2], 1); " + //调用hset 设置 key value 1 这个1代表重入次数 
                        "redis.call('pexpire', KEYS[1], ARGV[1]); " +  //设置超时时间  
                        "return nil; " +
                        "end; " +
                        "if (redis.call('hexists', KEYS[1], ARGV[2]) == 1) " +
                        "then redis.call('hincrby', KEYS[1], ARGV[2], 1); " +
                        "redis.call('pexpire', KEYS[1], ARGV[1]); " +
                        "return nil; " +
                        "end; " +
                        "return redis.call('pttl', KEYS[1]);"
                Collections.singletonList(this.getName()), new Object[]{this.internalLockLeaseTime, this.getLockName(threadId)});

//KEYS[1] 分布式锁的key的值
//ARGV[1] internalLockLeaseTime 的值，
this.internalLockLeaseTime = commandExecutor.getConnectionManager().getCfg().getLockWatchdogTimeout(); //获取锁看门狗的超时时间,默认S为30秒
//ARGV[2] this.getLockName(threadId)   
    /* String getLockName(long threadId) {
      *   return this.id + ":" + threadId;   //通过一个uuid : 当前线程id确定
    */ }

private void scheduleExpirationRenewal(final long threadId) {
        if (!expirationRenewalMap.containsKey(this.getEntryName())) {
            Timeout task = this.commandExecutor.getConnectionManager().newTimeout(new TimerTask() {
                public void run(Timeout timeout) throws Exception {
                    //判断主线程是否结束,也就是主线程加的那把锁是否还存在,如果还存在，则续命30秒。
                    RFuture<Boolean> future = RedissonLock.this.commandExecutor.evalWriteAsync(RedissonLock.this.getName(), LongCodec.INSTANCE, RedisCommands.EVAL_BOOLEAN, "if (redis.call('hexists', KEYS[1], ARGV[2]) == 1) then redis.call('pexpire', KEYS[1], ARGV[1]); return 1; end; return 0;", Collections.singletonList(RedissonLock.this.getName()), new Object[]{RedissonLock.this.internalLockLeaseTime, RedissonLock.this.getLockName(threadId)});
                    
                    future.addListener(new FutureListener<Boolean>() {
                        public void operationComplete(Future<Boolean> future) throws Exception {
                            RedissonLock.expirationRenewalMap.remove(RedissonLock.this.getEntryName());
                            if (!future.isSuccess()) {
                                RedissonLock.log.error("Can't update lock " + RedissonLock.this.getName() + " expiration", future.cause());
                            } else {
                                if ((Boolean)future.getNow()) {
                                    //自旋方式实现锁续命
                                    RedissonLock.this.scheduleExpirationRenewal(threadId);
                                }

                            }
                        }
                    });
                }
            }, this.internalLockLeaseTime / 3L, TimeUnit.MILLISECONDS);
            if (expirationRenewalMap.putIfAbsent(this.getEntryName(), task) != null) {
                task.cancel();
            }

        }
    }

protected RFuture<Boolean> unlockInnerAsync(long threadId) {
            return this.commandExecutor.evalWriteAsync(this.getName(), LongCodec.INSTANCE, RedisCommands.EVAL_BOOLEAN,
                    "if (redis.call('exists', KEYS[1]) == 0) " +
                            "then redis.call('publish', KEYS[2], ARGV[1]); " +
                            "return 1; " +
                            "end;" +
                            "if (redis.call('hexists', KEYS[1], ARGV[3]) == 0) " +
                            "then return nil;" +
                            "end;" +
                            " local counter = redis.call('hincrby', KEYS[1], ARGV[3], -1); " +
                            "if (counter > 0) then redis.call('pexpire', KEYS[1], ARGV[2]); " +
                            "return 0; " +
                            "else redis.call('del', KEYS[1]); " +
                            "redis.call('publish', KEYS[2], ARGV[1]); return 1; " +
                            "end; " +
                            "return nil;",
                    Arrays.asList(this.getName(), this.getChannelName()), new Object[]{LockPubSub.unlockMessage, this.internalLockLeaseTime, this.getLockName(threadId)});
}