public ReadStream(CachedItem cachedItem)
{
_cachedItem = cachedItem;
_cachedItem.LastAccessed = DateTime.UtcNow;
Interlocked.Increment(ref cachedItem._readerCount);
_sourceStream = File.OpenRead(cachedItem.FilePath);
}
public Stream Add(string fileKey, Stream stream, long uncompressedLength)
{
if (!_cacheSettings.Enabled || uncompressedLength > _cacheSettings.MaxCacheSize)
{
return(stream);
}
_lock.EnterUpgradeableReadLock();
try
{
if (_cachedItems.ContainsKey(fileKey))
{
return(stream);
}
_lock.EnterWriteLock();
CachedItem cachedItem;
try
{
if (IsFull(uncompressedLength))
{
EvictCachedItems(uncompressedLength);
if (IsFull(uncompressedLength))
{
return(stream);
}
}
cachedItem = new CachedItem(fileKey, uncompressedLength, _cacheSettings);
_cachedItems.Add(fileKey, cachedItem);
_cacheSize += uncompressedLength;
}
finally
{
_lock.ExitWriteLock();
}
// call create outside of the write lock as to not stop other writers whilst we copy the data into the cache.
return(cachedItem.Create(stream));
}
finally
{
_lock.ExitUpgradeableReadLock();
}
}