public StreamID Reference(StreamID streamID)
{
LocalStreamHeader targetHeader;
if (_headers.TryGetValue(streamID, out targetHeader) && (targetHeader.Stream != null) && targetHeader.Stream.Modified)
{
StreamID localStreamID = Allocate();
Stream stream = Open(localStreamID, LockMode.Exclusive);
try
{
Stream targetStream = new CoverStream(targetHeader.Stream);
try
{
StreamUtility.CopyStream(targetStream, stream);
return(localStreamID);
}
finally
{
targetStream.Close();
}
}
finally
{
stream.Close();
Close(localStreamID);
}
}
else
{
StreamID localStreamID = _sourceStreamManager.Reference(streamID);
LocalStreamHeader header = new LocalStreamHeader(localStreamID);
_headers.Add(header);
return(localStreamID);
}
}
StreamID IStreamManager.Reference(StreamID streamID)
{
return(StreamManager.Reference(streamID));
}