public VoronStream ReadStream(Slice key)
{
var tree = FixedTreeFor(key, ChunkDetails.SizeOf);
var numberOfChunks = tree.NumberOfEntries;
if (numberOfChunks <= 0)
{
return(null);
}
var chunksDetails = new ChunkDetails[numberOfChunks];
var i = 0;
using (var it = tree.Iterate())
{
if (it.Seek(0) == false)
{
return(null);
}
do
{
using (it.Value(out Slice slice))
{
chunksDetails[i++] = *(ChunkDetails *)slice.Content.Ptr;
}
} while (it.MoveNext());
}
return(new VoronStream(tree.Name, chunksDetails, _llt));
}
private bool TryGetLastChunkDetailsForStream(Slice key, out ChunkDetails lastChunk)
{
lastChunk = default;
var tree = FixedTreeFor(key, ChunkDetails.SizeOf);
if (tree.NumberOfEntries == 0)
{
return(false);
}
using (var it = tree.Iterate())
{
if (it.SeekToLast() == false)
{
return(false);
}
using (tree.Read(it.CurrentKey, out Slice slice))
{
if (slice.HasValue == false)
{
return(false);
}
lastChunk = *(ChunkDetails *)slice.Content.Ptr;
return(true);
}
}
}
public ChunkDetails[] ReadTreeChunks(Slice key, out FixedSizeTree tree)
{
tree = FixedTreeFor(key, ChunkDetails.SizeOf);
var numberOfChunks = tree.NumberOfEntries;
if (numberOfChunks <= 0)
{
return(null);
}
var chunksDetails = new ChunkDetails[numberOfChunks];
var i = 0;
using (var it = tree.Iterate())
{
if (it.Seek(0) == false)
{
Debug.Assert(false, "ReadTreeChunks failed to find any chunks, but we checked that the fst is not empty");
return(null); // can never happen
}
do
{
using (it.Value(out Slice slice))
{
chunksDetails[i++] = *(ChunkDetails *)slice.Content.Ptr;
}
} while (it.MoveNext());
}
return(chunksDetails);
}
private void FlushPage(long pageNumber, int chunkSize)
{
var chunkDetails = new ChunkDetails
{
PageNumber = pageNumber,
ChunkSize = chunkSize
};
using (Slice.External(_parent._tx.Allocator, (byte *)&chunkDetails, ChunkDetails.SizeOf, out Slice value))
{
_tree.Add(_chunkNumber++, value);
}
}
private void RecordChunkPage(long pageNumber, int chunkSize)
{
var chunkDetails = new ChunkDetails
{
PageNumber = pageNumber,
ChunkSize = chunkSize
};
((StreamPageHeader *)_currentPage.Pointer)->ChunkSize = chunkSize;
using (Slice.External(_parent._tx.Allocator, (byte *)&chunkDetails, ChunkDetails.SizeOf, out Slice value))
{
_tree.Add(_chunkNumber++, value);
}
}
