/// <summary>
/// Adds new entry
/// </summary>
public StorageStreamMetadata Add(Guid streamId, int tag = 0)
{
// Get the position of first empty entry
int index = map.FindFirstEmptyEntry();
long streamPosition = index * StorageStreamMetadata.StructureSize;
// Resize stream is needed
if ((streamPosition + StorageStreamMetadata.StructureSize) > stream.Length)
{
int count = (int)stream.Length / StorageStreamMetadata.StructureSize;
count += Math.Min(Math.Max((int)(count * 1.5), 512), 50000);
long oldLength = stream.Length;
stream.SetLength(count * StorageStreamMetadata.StructureSize);
// Write zeros to newly allocated space
long bytesToWrite = stream.Length - oldLength;
stream.Position = oldLength;
while (bytesToWrite > 0)
{
int amount = (int)Math.Min(bytesToWrite, Tools.EmptyBuffer.Length);
stream.Write(Tools.EmptyBuffer, 0, amount);
bytesToWrite -= amount;
}
stream.Save();
}
StorageStreamMetadata streamMetadata = new StorageStreamMetadata(stream)
{
FirstSegmentPosition = null,
StreamId = streamId,
Tag = tag,
StreamTableIndex = index
};
entriesAddedInTransaction.Add(streamId, streamMetadata);
//streamMetadata.Save();
map.Set(index, true);
items.Add(streamId, index);
return(streamMetadata);
}
/// <summary>
/// Deletes a stream
/// </summary>
/// <param name="streamId">Stream Id</param>
public void DeleteStream(Guid streamId)
{
CheckClosed();
if (SystemStreamId.IsSystemStreamId(streamId))
{
throw new InvalidStreamIdException();
}
StartTransaction();
try
{
// Before deleting, set stream size to zero to deallocate all of the space it occupies
StorageStream tmpStream = OpenStream(streamId);
tmpStream.SetLength(0);
tmpStream.Close();
openedStreams.Remove(streamId);
streamTable.Remove(streamId);
// Remove stream from list of changed streams
tmpStream = streamsChangedDuringTransaction.SingleOrDefault(x => x.StreamId == streamId);
if (tmpStream != null)
{
streamsChangedDuringTransaction.Remove(tmpStream);
}
// Remove stream from list of created streams
if (streamsCreatedDuringTransaction.Contains(streamId))
{
streamsCreatedDuringTransaction.Remove(streamId);
}
CommitTransaction();
}
catch
{
RollbackTransaction();
throw;
}
}