Caching data in ASP.NET using Lazy<T>

AspNetCaching.cs

class CachedDataSource
{
          protected T RetrieveCachedData<T>(
            string cacheKey, Func<T> fallbackFunction, CacheItemPolicy cachePolicy) where T : class
        {
            var originalData = new CacheItem<Lazy<T>>(new Lazy<T>(fallbackFunction));
            var cachedData = (CacheItem<Lazy<T>>)_cacheProvider.AddOrGetExisting(cacheKey, originalData, cachePolicy);
            if (cachedData != null)
            {
                Logger.LogMessage(SeverityLevels.Verbose,
                    CacheServiceLogCategory,
                    string.Format(DataReadFromCacheFormat, cacheKey, _regionName));
                return cachedData.Item.Value;
            }
            Logger.LogMessage(SeverityLevels.Information,
                CacheServiceLogCategory,
                string.Format(DataAddedToCacheFormat, cacheKey, _regionName));
            return originalData.Item.Value;
        }
}