public async Task <ClientEntity> GetClientByIdAsync(int clientId)
{
var key = GetCacheKey(clientId);
var clientEntity = await _redisCache.GetAsync <ClientEntity>(key);
if (clientEntity != null)
{
return(clientEntity.ClientId == -1 ? null : clientEntity);
}
var expiry = TimeSpan.FromSeconds(5);
var wait = TimeSpan.FromSeconds(5);
var retry = TimeSpan.FromSeconds(1);
using (var redLock = await _redisCache.CreateLockAsync(key, expiry, wait, retry))
{
if (!redLock.IsAcquired)
{
return(null);
}
clientEntity = await _redisCache.GetAsync <ClientEntity>(key);
if (clientEntity?.ClientId != -1)
{
return(clientEntity);
}
clientEntity = await _clientRepository.TableNoTracking.FirstOrDefaultAsync(c => c.ClientId == clientId);
if (clientEntity != null)
{
await _redisCache.AddAsync(key, clientEntity);
}
else
{
//防止不存在的clientId频繁访问数据库
await _redisCache.AddAsync(key, new ClientEntity { ClientId = -1 }, expiry : TimeSpan.FromMinutes(15));
}
}
return(clientEntity);
}