/// <summary>
/// Creates a storage
/// </summary>
private void CreateStorage(Stream stream)
{
this.MasterStream = new MasterStream(stream, false);
// Initialize storage metadata
Segment metadataStreamSegment = Segment.Create(0, blockSize, null);
metadataStreamSegment.Save(stream);
StorageStream metadataStream = new StorageStream(new StorageStreamMetadata(null)
{
FirstSegmentPosition = 0,
InitializedLength = blockSize - Segment.StructureSize,
Length = blockSize - Segment.StructureSize,
StreamId = SystemStreamId.StorageMetadata,
StreamTableIndex = -1
}, this);
StorageMetadata storageMetadata = new StorageMetadata("[TmStorage 1.0]"); // Set metadata again because above, stream was not specified
storageMetadata.Save(metadataStream);
metadataStream.Close();
// Initialize stream table
long streamTableSegmentSize = 1000 / ((int)blockSize / StorageStreamMetadata.StructureSize) * blockSize;
Segment streamTableSegment = Segment.Create(blockSize, streamTableSegmentSize, null);
stream.Position = metadataStreamSegment.DataAreaEnd;
streamTableSegment.Save(stream);
StorageStream streamTableStream = new StorageStream(new StorageStreamMetadata(null)
{
FirstSegmentPosition = blockSize,
InitializedLength = streamTableSegmentSize - Segment.StructureSize,
Length = streamTableSegmentSize - Segment.StructureSize,
StreamId = SystemStreamId.StreamTable,
StreamTableIndex = -1
}, this);
// Initialize empty space stream
Segment emptyStreamSegment = Segment.Create(streamTableSegment.DataAreaEnd, long.MaxValue - streamTableSegment.DataAreaEnd, null);
stream.Position = streamTableSegment.DataAreaEnd;
emptyStreamSegment.Save(stream);
// Write empty space stream metadata to stream table
StorageStreamMetadata emptySpaceStreamMetadata = new StorageStreamMetadata(streamTableStream)
{
FirstSegmentPosition = emptyStreamSegment.Location,
InitializedLength = emptyStreamSegment.DataAreaSize,
Length = emptyStreamSegment.DataAreaSize,
StreamId = SystemStreamId.EmptySpace,
StreamTableIndex = 0
};
emptySpaceStreamMetadata.Save();
this.MasterStream = null;
}
/// <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;
}
}
/// <summary>
/// Creates a storage
/// </summary>
private void CreateStorage(Stream stream)
{
this.MasterStream = new MasterStream(stream, false);
// Initialize storage metadata
Segment metadataStreamSegment = Segment.Create(0, blockSize, null);
metadataStreamSegment.Save(stream);
StorageStream metadataStream = new StorageStream(new StorageStreamMetadata(null)
{
FirstSegmentPosition = 0,
InitializedLength = blockSize - Segment.StructureSize,
Length = blockSize - Segment.StructureSize,
StreamId = SystemStreamId.StorageMetadata,
StreamTableIndex = -1
}, this);
StorageMetadata storageMetadata = new StorageMetadata("[TmStorage 1.0]"); // Set metadata again because above, stream was not specified
storageMetadata.Save(metadataStream);
metadataStream.Close();
// Initialize stream table
long streamTableSegmentSize = 1000 / ((int)blockSize / StorageStreamMetadata.StructureSize) * blockSize;
Segment streamTableSegment = Segment.Create(blockSize, streamTableSegmentSize, null);
stream.Position = metadataStreamSegment.DataAreaEnd;
streamTableSegment.Save(stream);
StorageStream streamTableStream = new StorageStream(new StorageStreamMetadata(null)
{
FirstSegmentPosition = blockSize,
InitializedLength = streamTableSegmentSize - Segment.StructureSize,
Length = streamTableSegmentSize - Segment.StructureSize,
StreamId = SystemStreamId.StreamTable,
StreamTableIndex = -1
}, this);
// Initialize empty space stream
Segment emptyStreamSegment = Segment.Create(streamTableSegment.DataAreaEnd, long.MaxValue - streamTableSegment.DataAreaEnd, null);
stream.Position = streamTableSegment.DataAreaEnd;
emptyStreamSegment.Save(stream);
// Write empty space stream metadata to stream table
StorageStreamMetadata emptySpaceStreamMetadata = new StorageStreamMetadata(streamTableStream)
{
FirstSegmentPosition = emptyStreamSegment.Location,
InitializedLength = emptyStreamSegment.DataAreaSize,
Length = emptyStreamSegment.DataAreaSize,
StreamId = SystemStreamId.EmptySpace,
StreamTableIndex = 0
};
emptySpaceStreamMetadata.Save();
this.MasterStream = null;
}