public static async Task <T> GetOrCreateAsync <T>(this ICacheAsync cache, string key, Func <Task <T> > func, TimeSpan expiresIn, CacheDurationType cacheDuration, bool forceUpdate = false) where T : class
{
var rtnObj = await cache.Get <T>(key);
if (rtnObj != null && forceUpdate == false)
{
return(rtnObj);
}
var lockOn = LockCache.GetOrAdd(key, () => new AsyncLock());
using (await lockOn.LockAsync(TimeOut.AsyncLockTimeOut))
{
rtnObj = await cache.Get <T>(key);
if (rtnObj != null && forceUpdate == false)
{
return(rtnObj);
}
rtnObj = await func();
await cache.Set(key, rtnObj, expiresIn, cacheDuration);
return(rtnObj);
}
}
/// <summary>
/// 检查Redis中对应key的val是否是本机IP
/// </summary>
/// <param name="machineId"></param>
/// <returns></returns>
private async Task <bool> CheckIsLocalIp(string machineId)
{
string ip = await _cacheAsync.Get(Name + _datacenterId + machineId);
return(LocalIp.Equals(ip));
}