/// <summary>
/// The number of items in the cache or in a partition, if specified.
/// </summary>
/// <param name="partition">The optional partition.</param>
/// <param name="cacheReadMode">The cache read mode.</param>
/// <returns>The number of items in the cache.</returns>
/// <remarks>Calling this method does not extend sliding items lifetime.</remarks>
protected override long CountInternal(string partition, CacheReadMode cacheReadMode = CacheReadMode.ConsiderExpiryDate)
{
// If partition has not been specified, then we use the GetCount method provided directly
// by the MemoryCache.
if (partition == null)
{
return(_store.GetCount());
}
// Otherwise, we need to count items, which is surely slower. In fact, we also need to
// deserialize the key in order to understand if the item belongs to the partition.
return(_store.Count(x => DeserializeCacheKey(x.Key).Partition == partition));
}
