public override void Deallocate(StreamID streamID)
{
lock (this)
{
StreamHeader header = GetStreamHeader(streamID);
if (StreamTracingEnabled)
{
StreamEvents.Deallocate(streamID);
}
_headers.Remove(streamID);
StreamID sourceStreamID;;
if (!_referencingHeaders.TryGetValue(streamID, out sourceStreamID))
{
// if this stream is a referenced stream
if (header.References.Count > 0)
{
// select a referencing stream to be the new source stream
StreamID newStreamID = header.References[0];
StreamHeader newHeader = GetStreamHeader(newStreamID);
// reassign the stream id for the stream in the provider (from this stream to the new source stream id)
header.Provider.Reassign(header.StreamID, newStreamID);
// change the provider in the header for the new source stream id
newHeader.Provider = header.Provider;
if (newHeader.Stream != null)
{
newHeader.Stream.SourceStream = newHeader.Provider.Open(newStreamID); // TODO: Shouldn't this close the old stream?
}
// dereference the new header
_referencingHeaders.Remove(newStreamID);
header.References.RemoveAt(0);
// move all references to this stream to the new source stream
MoveReferences(header, newHeader);
}
else
{
// destroy this stream
header.Provider.Destroy(streamID);
}
}
else
{
// if this stream is a reference stream
StreamHeader sourceHeader = GetStreamHeader(sourceStreamID);
// move all references to this stream to the source stream
MoveReferences(header, sourceHeader);
// dereference the source stream
sourceHeader.References.Remove(streamID);
_referencingHeaders.Remove(streamID);
}
}
}
public void Unregister(StreamID streamID)
{
lock (this)
{
if (StreamTracingEnabled)
{
StreamEvents.Deallocate(streamID);
}
InternalUnregister(streamID);
}
}