/// <summary>
/// Gets the specified cacheKey, dataRetriever and expiration async.
/// </summary>
/// <returns>The async.</returns>
/// <param name="cacheKey">Cache key.</param>
/// <param name="dataRetriever">Data retriever.</param>
/// <param name="expiration">Expiration.</param>
/// <typeparam name="T">The 1st type parameter.</typeparam>
public override async Task <CacheValue <T> > BaseGetAsync <T>(string cacheKey, Func <Task <T> > dataRetriever, TimeSpan expiration)
{
ArgumentCheck.NotNullOrWhiteSpace(cacheKey, nameof(cacheKey));
ArgumentCheck.NotNegativeOrZero(expiration, nameof(expiration));
var result = await _memcachedClient.GetAsync <T>(this.HandleCacheKey(cacheKey));
if (result.Success)
{
CacheStats.OnHit();
if (_options.EnableLogging)
{
_logger?.LogInformation($"Cache Hit : cachekey = {cacheKey}");
}
return(new CacheValue <T>(result.Value, true));
}
CacheStats.OnMiss();
if (_options.EnableLogging)
{
_logger?.LogInformation($"Cache Missed : cachekey = {cacheKey}");
}
var flag = await _memcachedClient.StoreAsync(Enyim.Caching.Memcached.StoreMode.Add, this.HandleCacheKey($"{cacheKey}_Lock"), 1, TimeSpan.FromMilliseconds(_options.LockMs));
if (!flag)
{
await Task.Delay(_options.SleepMs);
return(await GetAsync(cacheKey, dataRetriever, expiration));
}
var item = await dataRetriever();
if (item != null)
{
await this.SetAsync(cacheKey, item, expiration);
await _memcachedClient.RemoveAsync(this.HandleCacheKey($"{cacheKey}_Lock"));
return(new CacheValue <T>(item, true));
}
else
{
await _memcachedClient.RemoveAsync(this.HandleCacheKey($"{cacheKey}_Lock"));
return(CacheValue <T> .NoValue);
}
}
/// <summary>
/// Sets the specified cacheKey, cacheValue and expiration async.
/// </summary>
/// <returns>The async.</returns>
/// <param name="cacheKey">Cache key.</param>
/// <param name="cacheValue">Cache value.</param>
/// <param name="expiration">Expiration.</param>
/// <typeparam name="T">The 1st type parameter.</typeparam>
public async Task SetAsync <T>(string cacheKey, T cacheValue, TimeSpan expiration)
{
ArgumentCheck.NotNullOrWhiteSpace(cacheKey, nameof(cacheKey));
ArgumentCheck.NotNull(cacheValue, nameof(cacheValue));
ArgumentCheck.NotNegativeOrZero(expiration, nameof(expiration));
if (MaxRdSecond > 0)
{
var addSec = new Random().Next(1, MaxRdSecond);
expiration.Add(new TimeSpan(0, 0, addSec));
}
await _memcachedClient.StoreAsync(Enyim.Caching.Memcached.StoreMode.Set, this.HandleCacheKey(cacheKey), cacheValue, expiration);
}