/// <summary>
///
/// </summary>
/// <param name="key"></param>
/// <param name="method"></param>
/// <returns></returns>
public override object GetItem(string key, StorageBase.ComputeItemMethod method)
{
long index = (uint)key.GetHashCode() % ItemsList.Length;
var items = ItemsList[index];
DateTime now = DateTime.Now;
lock (items)
{
DictionaryValue item;
if (!items.TryGetValue(key, out item) || item.ExpirationTime <= now)
{
DateTime expiration;
item = new DictionaryValue()
{
Value = method(out expiration), ExpirationTime = expiration
};
if (expiration > now) // item can be added into the cache
{
items[key] = item;
}
// update DictionaryInfo
DictionaryInfo info = ItemsListInfo[index];
if (expiration < info.MinExpirationTime)
{
info.MinExpirationTime = expiration;
}
// check some other items for expiration
if (info.MinExpirationTime < now && // some items expired
info.LastCheck < now.AddMinutes(-CleanupsIntervalMinutes)) // interval between cleanups
{
RemoveExpired(items, info);
}
}
return(item.Value);
}
}
public override object GetItem(string key, StorageBase.ComputeItemMethod method)
{
DateTime expiration;
return(method(out expiration));
}
