/// <summary>
/// Does the v2 serialization.
/// </summary>
/// <param name="stream"></param>
/// <param name="graph"></param>
/// <returns></returns>
protected override void DoSerialize(LimitedStream stream,
DynamicGraphRouterDataSource <CHEdgeData> graph)
{
// sort the graph.
IDynamicGraph <CHEdgeData> sortedGraph = CHEdgeDataDataSourceSerializer.SortGraph(graph);
// create the regions.
SortedDictionary <ulong, List <uint> > regions = new SortedDictionary <ulong, List <uint> >();
for (uint newVertexId = 1; newVertexId < sortedGraph.VertexCount + 1; newVertexId++)
{
// add to the CHRegions.
float latitude, longitude;
sortedGraph.GetVertex(newVertexId, out latitude, out longitude);
Tile tile = Tile.CreateAroundLocation(new GeoCoordinate(
latitude, longitude), RegionZoom);
List <uint> regionVertices;
if (!regions.TryGetValue(tile.Id, out regionVertices))
{
regionVertices = new List <uint>();
regions.Add(tile.Id, regionVertices);
}
regionVertices.Add(newVertexId);
}
// serialize the sorted graph.
// [START_OF_BLOCKS][[SIZE_OF_REGION_INDEX][REGION_INDEX][REGIONS]][[SIZE_OF_BLOCK_INDEX][BLOCK_INDEX][BLOCKS]]
// STRART_OF_BLOCKS: 4bytes
// SIZE_OF_REGION_INDEX: 4bytes
// REGION_INDEX: see SIZE_OF_REGION_INDEX
// REGIONS: see START_OF_BLOCKS - 4bytes
// SIZE_OF_BLOCK_INDEX: 4bytes
// BLOCK_INDEX: see SIZE_OF_BLOCK_INDEX.
// BLOCKS: from START_OF_BLOCKS + 4bytes + SIZE_OF_BLOCKS_INDEX until END.
// serialize regions and build their index.
CHVertexRegionIndex chRegionIndex = new CHVertexRegionIndex();
chRegionIndex.LocationIndex = new int[regions.Count];
chRegionIndex.RegionIds = new ulong[regions.Count];
var memoryStream = new MemoryStream();
int regionIdx = 0;
foreach (KeyValuePair <ulong, List <uint> > region in regions)
{
// serialize.
CHVertexRegion chRegion = new CHVertexRegion();
chRegion.Vertices = region.Value.ToArray();
_runtimeTypeModel.Serialize(memoryStream, chRegion);
// set index.
chRegionIndex.LocationIndex[regionIdx] = (int)memoryStream.Position;
chRegionIndex.RegionIds[regionIdx] = region.Key;
regionIdx++;
}
stream.Seek(8, SeekOrigin.Begin); // move to beginning of [REGION_INDEX]
_runtimeTypeModel.Serialize(stream, chRegionIndex); // write region index.
int sizeRegionIndex = (int)(stream.Position - 8); // now at beginning of [REGIONS]
memoryStream.Seek(0, SeekOrigin.Begin);
memoryStream.WriteTo(stream); // write regions.
memoryStream.Dispose();
int startOfBlocks = (int)stream.Position; // now at beginning of [SIZE_OF_BLOCK_INDEX]
stream.Seek(0, SeekOrigin.Begin); // move to beginning
stream.Write(BitConverter.GetBytes(startOfBlocks), 0, 4); // write start position of blocks. Now at [SIZE_OF_REGION_INDEX]
stream.Write(BitConverter.GetBytes(sizeRegionIndex), 0, 4); // write size of blocks index.
// serialize the blocks and build their index.
memoryStream = new MemoryStream();
List <int> blockLocations = new List <int>();
uint vertexId = 1;
while (vertexId < sortedGraph.VertexCount)
{
uint blockId = vertexId;
List <CHArc> blockArcs = new List <CHArc>();
List <CHVertex> blockVertices = new List <CHVertex>();
while (vertexId < blockId + BlockVertexSize &&
vertexId < sortedGraph.VertexCount + 1)
{ // create this block.
CHVertex chVertex = new CHVertex();
float latitude, longitude;
sortedGraph.GetVertex(vertexId, out latitude, out longitude);
chVertex.Latitude = latitude;
chVertex.Longitude = longitude;
chVertex.ArcIndex = (ushort)(blockArcs.Count);
foreach (KeyValuePair <uint, CHEdgeData> sortedArc in sortedGraph.GetArcs(vertexId))
{
CHArc chArc = new CHArc();
chArc.TargetId = sortedArc.Key;
chArc.ShortcutId = sortedArc.Value.ContractedVertexId;
chArc.Weight = sortedArc.Value.Weight;
chArc.Direction = sortedArc.Value.Direction;
blockArcs.Add(chArc);
}
chVertex.ArcCount = (ushort)(blockArcs.Count - chVertex.ArcIndex);
blockVertices.Add(chVertex);
vertexId++; // move to the next vertex.
}
// create block.
CHBlock block = new CHBlock();
block.Arcs = blockArcs.ToArray();
block.Vertices = blockVertices.ToArray(); // TODO: get rid of the list and create an array to begin with.
// write blocks.
_runtimeTypeModel.Serialize(memoryStream, block);
blockLocations.Add((int)memoryStream.Position);
}
CHBlockIndex blockIndex = new CHBlockIndex();
blockIndex.LocationIndex = blockLocations.ToArray();
stream.Seek(startOfBlocks + 4, SeekOrigin.Begin); // move to beginning of [BLOCK_INDEX]
_runtimeTypeModel.Serialize(stream, blockIndex); // write region index.
int sizeBlockIndex = (int)(stream.Position - (startOfBlocks + 4)); // now at beginning of [BLOCKS]
memoryStream.Seek(0, SeekOrigin.Begin);
memoryStream.WriteTo(stream); // write blocks.
memoryStream.Dispose();
stream.Seek(startOfBlocks, SeekOrigin.Begin); // move to [SIZE_OF_BLOCK_INDEX]
stream.Write(BitConverter.GetBytes(sizeBlockIndex), 0, 4); // write start position of blocks. Now at [SIZE_OF_REGION_INDEX]
stream.Flush();
}
/// <summary>
/// Does the v1 serialization.
/// </summary>
/// <param name="stream"></param>
/// <param name="graph"></param>
/// <returns></returns>
protected override void DoSerialize(LimitedStream stream,
DynamicGraphRouterDataSource <LiveEdge> graph)
{
// create an index per tile.
var dataPerTile = new Dictionary <Tile, UnserializedTileData>();
for (uint vertex = 1; vertex < graph.VertexCount + 1; vertex++)
{ // loop over all vertices and serialize all into the correct tile.
float latitude, longitude;
if (graph.GetVertex(vertex, out latitude, out longitude))
{ // the vertex was found.
// build the correct tile.
Tile tile = Tile.CreateAroundLocation(new GeoCoordinate(latitude, longitude), Zoom);
UnserializedTileData serializableGraphTile;
if (!dataPerTile.TryGetValue(tile, out serializableGraphTile))
{ // create the new tile.
serializableGraphTile = new UnserializedTileData();
serializableGraphTile.Ids = new List <uint>();
serializableGraphTile.Latitude = new List <ushort>();
serializableGraphTile.Longitude = new List <ushort>();
serializableGraphTile.StringTable = new Dictionary <string, int>();
serializableGraphTile.Arcs = new List <SerializableGraphArcs>();
dataPerTile.Add(tile, serializableGraphTile);
}
// create short latitude/longitude.
serializableGraphTile.Ids.Add(vertex);
serializableGraphTile.Latitude.Add((ushort)(((tile.TopLeft.Latitude - latitude)
/ tile.Box.DeltaLat) * ushort.MaxValue));
serializableGraphTile.Longitude.Add((ushort)(((longitude - tile.TopLeft.Longitude)
/ tile.Box.DeltaLon) * ushort.MaxValue));
// get the arcs.
KeyValuePair <uint, LiveEdge>[] arcs = graph.GetArcs(vertex);
// serialize the arcs.
if (arcs != null && arcs.Length > 0)
{
var serializableGraphArcs = new SerializableGraphArcs();
serializableGraphArcs.DestinationId = new uint[arcs.Length];
serializableGraphArcs.Forward = new bool[arcs.Length];
serializableGraphArcs.TileX = new int[arcs.Length];
serializableGraphArcs.TileY = new int[arcs.Length];
serializableGraphArcs.Tags = new SerializableTags[arcs.Length];
for (int idx = 0; idx < arcs.Length; idx++)
{
KeyValuePair <uint, LiveEdge> arc = arcs[idx];
// get destination tile.
if (graph.GetVertex(arc.Key, out latitude, out longitude))
{ // the destionation was found.
Tile destinationTile = Tile.CreateAroundLocation(
new GeoCoordinate(latitude, longitude), Zoom);
serializableGraphArcs.DestinationId[idx] = arc.Key;
serializableGraphArcs.TileX[idx] = destinationTile.X;
serializableGraphArcs.TileY[idx] = destinationTile.Y;
serializableGraphArcs.Forward[idx] = arc.Value.Forward;
// get the tags.
TagsCollectionBase tagsCollection =
graph.TagsIndex.Get(arc.Value.Tags);
if (tagsCollection != null)
{
serializableGraphArcs.Tags[idx] = new SerializableTags();
serializableGraphArcs.Tags[idx].Keys = new int[tagsCollection.Count];
serializableGraphArcs.Tags[idx].Values = new int[tagsCollection.Count];
int tagsIndex = 0;
foreach (var tag in tagsCollection)
{
int key;
if (!serializableGraphTile.StringTable.TryGetValue(
tag.Key, out key))
{ // string not yet in string table.
key = serializableGraphTile.StringTable.Count;
serializableGraphTile.StringTable.Add(tag.Key,
key);
}
int value;
if (!serializableGraphTile.StringTable.TryGetValue(
tag.Value, out value))
{ // string not yet in string table.
value = serializableGraphTile.StringTable.Count;
serializableGraphTile.StringTable.Add(tag.Value,
value);
}
serializableGraphArcs.Tags[idx].Keys[tagsIndex] = key;
serializableGraphArcs.Tags[idx].Values[tagsIndex] = value;
tagsIndex++;
}
}
}
}
serializableGraphTile.Arcs.Add(serializableGraphArcs);
}
}
}
// LAYOUT OF V2: {HEADER}{compressionflag(1byte)}{#tiles(4byte)}{tilesMetaEnd(8byte)}{tiles-meta-data-xxxxxxx}{tiles-data}
// {HEADER} : already written before this method.
// {#tiles(4byte)} : the number of tiles in this file (calculate the offset of the {tiles-data}
// section using (TileMetaSize * dataPerTile.Count + 4 + 8)
// {tilesMetaEnd(8byte)} : the end of the meta tiles.
// {tiles-meta-data-xxxxxxx} : the serialized tile metadata.
// {tiles-data} : the actual tile data.
// calculate the space needed for the tile offset.
const long tileMetaOffset = 1 + 4 + 8;
long tileOffset = TileMetaSize * dataPerTile.Count +
tileMetaOffset; // all tile metadata + a tile count + tags offset.
// build the tile metadata while writing the tile data.
stream.Seek(tileOffset, SeekOrigin.Begin);
var metas = new SerializableGraphTileMetas();
metas.Length = new int[dataPerTile.Count];
metas.Offset = new long[dataPerTile.Count];
metas.TileX = new int[dataPerTile.Count];
metas.TileY = new int[dataPerTile.Count];
int metasIndex = 0;
foreach (var unserializedTileData in dataPerTile)
{
// create the tile meta.
metas.TileX[metasIndex] = unserializedTileData.Key.X;
metas.TileY[metasIndex] = unserializedTileData.Key.Y;
metas.Offset[metasIndex] = stream.Position;
// create the tile.
var serializableGraphTile = new SerializableGraphTile();
serializableGraphTile.Arcs = unserializedTileData.Value.Arcs.ToArray();
serializableGraphTile.Ids = unserializedTileData.Value.Ids.ToArray();
serializableGraphTile.Latitude = unserializedTileData.Value.Latitude.ToArray();
serializableGraphTile.Longitude = unserializedTileData.Value.Longitude.ToArray();
serializableGraphTile.StringTable = new string[unserializedTileData.Value.StringTable.Count];
foreach (var stringEntry in unserializedTileData.Value.StringTable)
{
serializableGraphTile.StringTable[stringEntry.Value] =
stringEntry.Key;
}
// serialize the tile.
if (!_compress)
{ // compresses the file.
_runtimeTypeModel.Serialize(stream, serializableGraphTile);
}
else
{ // first compress the data, then write.
var uncompressed = new MemoryStream();
_runtimeTypeModel.Serialize(uncompressed, serializableGraphTile);
var uncompressedBuffer = uncompressed.ToArray();
byte[] compressed = GZipStream.CompressBuffer(uncompressedBuffer);
stream.Write(compressed, 0, compressed.Length);
}
// calculate the length of the data that was just serialized.
metas.Length[metasIndex] = (int)(stream.Position - metas.Offset[metasIndex]);
metasIndex++;
}
// serialize all tile meta data.
stream.Seek(tileMetaOffset, SeekOrigin.Begin);
_runtimeTypeModel.Serialize(stream, metas);
long tileMetaEnd = stream.Position; // save the meta and.
// save all the offsets.
stream.Seek(0, SeekOrigin.Begin);
byte[] compressionFlag = new[] { (byte)(_compress ? 1 : 0) };
stream.Write(compressionFlag, 0, 1);
byte[] tileCountBytes = BitConverter.GetBytes(metas.TileX.Length);
stream.Write(tileCountBytes, 0, tileCountBytes.Length); // 4 bytes
byte[] tileMetaEndBytes = BitConverter.GetBytes(tileMetaEnd);
stream.Write(tileMetaEndBytes, 0, tileMetaEndBytes.Length); // 8 bytes
stream.Flush();
}
/// <summary>
/// Does the v2 serialization.
/// </summary>
/// <param name="stream"></param>
/// <param name="graph"></param>
/// <returns></returns>
protected override void DoSerialize(LimitedStream stream,
DynamicGraphRouterDataSource <CHEdgeData> graph)
{
// sort the graph.
var sortedGraph = graph;
// create the regions.
var regions = new SortedDictionary <ulong, List <uint> >();
for (uint newVertexId = 1; newVertexId < sortedGraph.VertexCount + 1; newVertexId++)
{
// add to the CHRegions.
float latitude, longitude;
sortedGraph.GetVertex(newVertexId, out latitude, out longitude);
var tile = Tile.CreateAroundLocation(new GeoCoordinate(
latitude, longitude), _regionZoom);
List <uint> regionVertices;
if (!regions.TryGetValue(tile.Id, out regionVertices))
{
regionVertices = new List <uint>();
regions.Add(tile.Id, regionVertices);
}
regionVertices.Add(newVertexId);
}
// serialize the sorted graph.
// [START_OF_BLOCKS][START_OF_SHAPES][START_OF_REVERSE][START_OF_TAGS][[SIZE_OF_REGION_INDEX][REGION_INDEX][REGIONS]]
// [[SIZE_OF_BLOCK_INDEX][BLOCK_INDEX][BLOCKS]]
// [[SIZE_OF_SHAPE_INDEX][SHAPE_INDEX][SHAPES]]
// [[SIZE_OF_REVERSE_INDEX][REVERSE_INDEX][REVERSE]]
// [TAGS]
// START_OF_BLOCKS: 4bytes
// START_OF_SHAPES: 4bytes
// START_OF_STAGS: 4bytes
// START_OF_REVERSE 4bytes
// SIZE_OF_REGION_INDEX: 4bytes
// REGION_INDEX: see SIZE_OF_REGION_INDEX
// REGIONS: see START_OF_BLOCKS - 4bytes
// SIZE_OF_BLOCK_INDEX: 4bytes
// BLOCK_INDEX: see SIZE_OF_BLOCK_INDEX.
// BLOCKS: from START_OF_BLOCKS + 4bytes + SIZE_OF_BLOCKS_INDEX until END.
// serialize regions and build their index.
var chRegionIndex = new CHVertexRegionIndex();
chRegionIndex.LocationIndex = new int[regions.Count];
chRegionIndex.RegionIds = new ulong[regions.Count];
var memoryStream = new MemoryStream();
int regionIdx = 0;
foreach (var region in regions)
{
// serialize.
var chRegion = new CHVertexRegion();
chRegion.Vertices = region.Value.ToArray();
_runtimeTypeModel.Serialize(memoryStream, chRegion);
// set index.
chRegionIndex.LocationIndex[regionIdx] = (int)memoryStream.Position;
chRegionIndex.RegionIds[regionIdx] = region.Key;
regionIdx++;
}
stream.Seek(INDEX_SIZE, SeekOrigin.Begin); // move to beginning of [REGION_INDEX]
_runtimeTypeModel.Serialize(stream, chRegionIndex); // write region index.
var sizeRegionIndex = (int)(stream.Position - INDEX_SIZE); // now at beginning of [REGIONS]
memoryStream.Seek(0, SeekOrigin.Begin);
memoryStream.WriteTo(stream); // write regions.
memoryStream.Dispose();
var startOfBlocks = (int)stream.Position; // now at beginning of [SIZE_OF_BLOCK_INDEX]
// serialize the blocks and build their index.
memoryStream = new MemoryStream();
var blocks = new List <CHBlock>();
var blockLocations = new List <int>();
var blockShapeLocations = new List <int>();
var blockReverseLocations = new List <int>();
var blockShapes = new List <CHBlockCoordinates>();
var reverseNeighbours = new Dictionary <uint, List <uint> >();
uint vertexId = 1;
while (vertexId < sortedGraph.VertexCount + 1)
{
uint blockId = vertexId;
var blockArcs = new List <CHArc>();
var blockArcCoordinates = new List <CHArcCoordinates>();
var blockVertices = new List <CHVertex>();
while (vertexId < blockId + _blockVertexSize &&
vertexId < sortedGraph.VertexCount + 1)
{ // create this block.
var chVertex = new CHVertex();
float latitude, longitude;
sortedGraph.GetVertex(vertexId, out latitude, out longitude);
chVertex.Latitude = latitude;
chVertex.Longitude = longitude;
chVertex.ArcIndex = (ushort)(blockArcs.Count);
List <uint> reverse = null;
foreach (var sortedArc in sortedGraph.GetEdges(vertexId))
{
var chArc = new CHArc();
chArc.TargetId = sortedArc.Neighbour;
chArc.Meta = sortedArc.EdgeData.Meta;
chArc.Value = sortedArc.EdgeData.Value;
chArc.Weight = sortedArc.EdgeData.Weight;
blockArcs.Add(chArc);
var chArcCoordinates = new CHArcCoordinates();
chArcCoordinates.Coordinates = sortedArc.Intermediates.ToSimpleArray();
blockArcCoordinates.Add(chArcCoordinates);
if (sortedArc.EdgeData.RepresentsNeighbourRelations)
{
if (!reverseNeighbours.TryGetValue(sortedArc.Neighbour, out reverse))
{
reverse = new List <uint>();
reverseNeighbours[sortedArc.Neighbour] = reverse;
}
reverse.Add(vertexId);
}
}
chVertex.ArcCount = (ushort)(blockArcs.Count - chVertex.ArcIndex);
blockVertices.Add(chVertex);
vertexId++; // move to the next vertex.
}
// create block.
var block = new CHBlock();
block.Arcs = blockArcs.ToArray();
block.Vertices = blockVertices.ToArray(); // TODO: get rid of the list and create an array to begin with.
blocks.Add(block);
var blockCoordinates = new CHBlockCoordinates();
blockCoordinates.Arcs = blockArcCoordinates.ToArray();
// write blocks.
var blockStream = new MemoryStream();
_runtimeTypeModel.Serialize(blockStream, block);
var compressed = GZipStream.CompressBuffer(blockStream.ToArray());
blockStream.Dispose();
memoryStream.Write(compressed, 0, compressed.Length);
blockLocations.Add((int)memoryStream.Position);
blockShapes.Add(blockCoordinates);
}
var blockIndex = new CHBlockIndex();
blockIndex.BlockLocationIndex = blockLocations.ToArray();
stream.Seek(startOfBlocks + 4, SeekOrigin.Begin); // move to beginning of [BLOCK_INDEX]
_runtimeTypeModel.Serialize(stream, blockIndex); // write block index.
int sizeBlockIndex = (int)(stream.Position - (startOfBlocks + 4)); // now at beginning of [BLOCKS]
memoryStream.Seek(0, SeekOrigin.Begin);
memoryStream.WriteTo(stream); // write blocks.
memoryStream.Dispose();
// write shapes and index.
memoryStream = new MemoryStream();
var startOfShapes = stream.Position;
foreach (var blockCoordinates in blockShapes)
{
// write shape blocks.
var blockShapeStream = new MemoryStream();
_runtimeTypeModel.Serialize(blockShapeStream, blockCoordinates);
var compressed = GZipStream.CompressBuffer(blockShapeStream.ToArray());
blockShapeStream.Dispose();
memoryStream.Write(compressed, 0, compressed.Length);
blockShapeLocations.Add((int)memoryStream.Position);
}
blockIndex = new CHBlockIndex();
blockIndex.BlockLocationIndex = blockShapeLocations.ToArray();
stream.Seek(startOfShapes + 4, SeekOrigin.Begin); // move to beginning of [SHAPE_INDEX]
_runtimeTypeModel.Serialize(stream, blockIndex); // write shape index.
int sizeShapeIndex = (int)(stream.Position - (startOfShapes + 4)); // now at beginning of [SHAPE]
memoryStream.Seek(0, SeekOrigin.Begin);
memoryStream.WriteTo(stream); // write shapes.
memoryStream.Dispose();
// build reverse blocks.
var blockReverses = new List <CHBlockReverse>();
List <uint> storedReverses = null;
uint currentVertexId = 0;
for (int i = 0; i < blocks.Count; i++)
{
var blockReverse = new CHBlockReverse();
blockReverse.Vertices = new CHArcReverse[blocks[i].Vertices.Length];
for (int j = 0; j < blocks[i].Vertices.Length; j++)
{
currentVertexId++;
var blockReverseArc = new CHArcReverse();
blockReverseArc.Neighbours = new uint[0];
if (reverseNeighbours.TryGetValue(currentVertexId, out storedReverses))
{
blockReverseArc.Neighbours = storedReverses.ToArray();
}
blockReverse.Vertices[j] = blockReverseArc;
}
blockReverses.Add(blockReverse);
}
// write reverse and index.
memoryStream = new MemoryStream();
var startOfReverses = stream.Position;
foreach (var blockReverse in blockReverses)
{
// write reverse blocks.
var blockReverseStream = new MemoryStream();
_runtimeTypeModel.Serialize(blockReverseStream, blockReverse);
var compressed = GZipStream.CompressBuffer(blockReverseStream.ToArray());
blockReverseStream.Dispose();
memoryStream.Write(compressed, 0, compressed.Length);
blockReverseLocations.Add((int)memoryStream.Position);
}
blockIndex = new CHBlockIndex();
blockIndex.BlockLocationIndex = blockReverseLocations.ToArray();
stream.Seek(startOfReverses + 4, SeekOrigin.Begin); // move to beginning of [REVERSE_INDEX]
_runtimeTypeModel.Serialize(stream, blockIndex); // write reverse index.
int sizeReverseIndex = (int)(stream.Position - (startOfReverses + 4)); // now at beginning of [REVERSE]
memoryStream.Seek(0, SeekOrigin.Begin);
memoryStream.WriteTo(stream); // write reverses.
memoryStream.Dispose();
// write tags after reverses.
int tagsPosition = (int)stream.Position;
TagIndexSerializer.SerializeBlocks(stream, graph.TagsIndex, 10);
stream.Seek(startOfBlocks, SeekOrigin.Begin); // move to [SIZE_OF_BLOCK_INDEX]
stream.Write(BitConverter.GetBytes(sizeBlockIndex), 0, 4); // write start position of blocks.
stream.Seek(startOfShapes, SeekOrigin.Begin); // move to [SIZE_OF_BLOCK_INDEX]
stream.Write(BitConverter.GetBytes(sizeShapeIndex), 0, 4); // write start position of blocks.
stream.Seek(startOfReverses, SeekOrigin.Begin); // move to [SIZE_OF_REVERSE_INDEX]
stream.Write(BitConverter.GetBytes(sizeReverseIndex), 0, 4); // write start position of blocks.
// write index.
stream.Seek(0, SeekOrigin.Begin); // move to beginning
stream.Write(BitConverter.GetBytes(startOfBlocks), 0, 4); // write start position of blocks.
stream.Write(BitConverter.GetBytes(startOfShapes), 0, 4); // write start position of shapes.
stream.Write(BitConverter.GetBytes(startOfReverses), 0, 4); // write start position of shapes.
stream.Write(BitConverter.GetBytes(tagsPosition), 0, 4);
stream.Write(BitConverter.GetBytes(sizeRegionIndex), 0, 4); // write size of region index.
stream.Flush();
}
