public CheckPoint SaveChunk(uint startBlock, uint endBlock)
{
lock (LoadLock)
{
var list = new List <CheckPointBlock>();
var header = new CheckPointHeader
{
StartBlock = startBlock,
EndBlock = endBlock,
BlockCount = endBlock - startBlock + 1
};
for (var i = startBlock; i <= endBlock; i++)
{
list.Add(this[i]);
}
var ms = new MemoryStream();
header.Offsets = new uint[list.Count + 1];
header.SaveToStream(ms);
long headerSize = ms.Position;
ms.Position = 0;
using (var bw = new BinaryWriter(ms, Encoding.Default, true))
{
uint i = 0;
foreach (var b in list)
{
header.Offsets[i] = (uint)(ms.Position + headerSize);
b.SaveToStream(ms);
i++;
}
}
var memoryStream = new MemoryStream();
header.SaveToStream(memoryStream);
ms.Position = 0;
ms.CopyTo(memoryStream);
memoryStream.Write(header.Hash, 0, header.Hash.Length);
if (_stream != null)
{
_stream.Dispose();
_stream = null;
}
memoryStream.Position = 0;
var checkPoint = new CheckPoint(memoryStream);
ms.Dispose();
memoryStream.Dispose();
GC.Collect();
return(checkPoint);
}
}
public void Append(CheckPoint checkPoint)
{
lock (LoadLock)
{
var list = new List <CheckPointBlock>();
if (Header != null)
{
for (uint i = Header.StartBlock; i < Header.EndBlock + 1; i++)
{
list.Add(this[i]);
}
if (Header.BlockCount > checkPoint.Header.BlockCount)
{
return;
}
Header.BlockCount = checkPoint.Header.BlockCount;
Header.Hash = checkPoint.Header.Hash;
Header.EndBlock = checkPoint.Header.EndBlock;
}
else
{
Header = checkPoint.Header;
}
for (uint i = 0; i != checkPoint.Header.EndBlock - checkPoint.Header.StartBlock + 1; i++)
{
// log.Info($"Added block {i}");
list.Add(checkPoint[i]);
}
var ms = new MemoryStream();
Header.Offsets = new uint[list.Count + 1];
Header.SaveToStream(ms);
long headerSize = ms.Position;
ms.Position = 0;
// log.Info("checkPoint 1");
using (var bw = new BinaryWriter(ms, Encoding.Default, true))
{
uint i = 0;
foreach (var b in list)
{
Header.Offsets[i] = (uint)(ms.Position + headerSize);
b.SaveToStream(ms);
i++;
}
}
// log.Info("checkPoint 2");
var memoryStream = new MemoryStream();
Header.SaveToStream(memoryStream);
ms.Position = 0;
ms.CopyTo(memoryStream);
memoryStream.Write(Header.Hash, 0, Header.Hash.Length);
if (_stream != null)
{
_stream.Dispose();
_stream = null;
}
memoryStream.Position = 0;
// log.Info("checkPoint 3");
LoadFromStream(memoryStream);
// log.Info("checkPoint 4");
ms.Dispose();
memoryStream.Dispose();
GC.Collect();
// log.Info("checkPoint appended");
}
}