/// <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;
}
internal static StorageMetadata Load(Stream stream)
{
stream.Position = 0;
BinaryReader reader = new BinaryReader(stream);
string version = reader.ReadString();
int hash = reader.ReadInt32();
int calculatedHash = Tools.CalculateHash(version);
if (hash != calculatedHash)
throw new StorageCorruptException("Metadata has check failed");
StorageMetadata metadata = new StorageMetadata(version);
return metadata;
}
internal static StorageMetadata Load(Stream stream)
{
stream.Position = 0;
BinaryReader reader = new BinaryReader(stream);
string version = reader.ReadString();
int hash = reader.ReadInt32();
int calculatedHash = Tools.CalculateHash(version);
if (hash != calculatedHash)
{
throw new StorageCorruptException("Metadata has check failed");
}
StorageMetadata metadata = new StorageMetadata(version);
return(metadata);
}
/// <summary>
/// Opens the storage
/// </summary>
private void OpenStorage()
{
StartTransaction();
try
{
// For metadata assume block size of 512 because blockSize is unknown at this point.
// 512 is the smallest block size so it will work as long as storage metadata is not
// longer than 512 bytes
storageMetadataStream = new StorageStream(new StorageStreamMetadata(null)
{
FirstSegmentPosition = 0,
InitializedLength = 512 - Segment.StructureSize,
Length = 512 - Segment.StructureSize,
StreamId = SystemStreamId.StorageMetadata,
StreamTableIndex = -1
}, this);
StorageMetadata = StorageMetadata.Load(storageMetadataStream);
streamTableStreamMetadata = new StorageStreamMetadata(storageMetadataStream)
{
FirstSegmentPosition = blockSize,
StreamId = SystemStreamId.StreamTable,
StreamTableIndex = -1
};
streamTableStream = new StorageStream(streamTableStreamMetadata, this);
streamTable = new StreamTable(streamTableStream);
var freeSpaceStreamMetadata = streamTable.Get(SystemStreamId.EmptySpace);
FreeSpaceStream = new StorageStream(freeSpaceStreamMetadata, this);
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;
}
