redisson分布式读写锁-读锁watchDog原理

{
  "anyLock": {
    "mode": "read",
    "uuid01:threadId01": 3
  }
}
{anyLock}:uuid01:threadId01:rwlock_timeout:1 1
{anyLock}:uuid01:threadId01:rwlock_timeout:2 1
{anyLock}:uuid01:threadId01:rwlock_timeout:3 1

local counter = redis.call('hget', KEYS[1], ARGV[2]);  
if (counter ~= false) then  
    redis.call('pexpire', KEYS[1], ARGV[1]);      
    if (redis.call('hlen', KEYS[1]) > 1) then  
        local keys = redis.call('hkeys', KEYS[1]);   
        for n, key in ipairs(keys) do   
            counter = tonumber(redis.call('hget', KEYS[1], key));   
            if type(counter) == 'number' then   
                for i=counter, 1, -1 do   
                    redis.call('pexpire', KEYS[2] .. ':' .. key .. ':rwlock_timeout:' .. i, ARGV[1]);   
                end;   
            end;   
        end;  
    end;  
   return 1;  
end;  
return 0;