/// <summary>
        /// Clears this cache, removing all items in the base cache and all regions.
        /// </summary>
        public override void Clear()
        {
            // warning: takes ~20seconds to flush the bucket...
            var manager = _bucketManager.GetManager();

            if (manager != null)
            {
                using (manager)
                {
                    manager.Flush();
                }
            }
        }