private async Task <byte[]> GetAndRefreshAsync(string key, bool getData, CancellationToken token = default(CancellationToken))
{
if (key == null)
{
throw new ArgumentNullException(nameof(key));
}
token.ThrowIfCancellationRequested();
// This also resets the LRU status as desired.
// TODO: Can this be done in one operation on the server side? Probably, the trick would just be the DateTimeOffset math.
object[] results;
byte[] value = null;
if (getData)
{
var ret = await _redisClient.HMGetAsync <byte[]>(key, AbsoluteExpirationKey, SlidingExpirationKey, DataKey);
results = new object[] { ret[0] == null ? null : Encoding.UTF8.GetString(ret[0]), ret[1] == null ? null : Encoding.UTF8.GetString(ret[1]), value = ret[2] };
}
else
{
results = await _redisClient.HMGetAsync(key, AbsoluteExpirationKey, SlidingExpirationKey);
}
// TODO: Error handling
if (results.Length >= 2)
{
MapMetadata(results, out DateTimeOffset? absExpr, out TimeSpan? sldExpr);
await RefreshAsync(key, absExpr, sldExpr, token);
}
if (results.Length >= 3)
{
return(value);
}
return(null);
}
