public void FlushChanges()
{
Tuple <long, byte[]>[] changed;
lock (_snapshots.SyncRoot)
{
if (!_resetFile)
{
if (_dirtyKeys.Count == 0)
{
return;
}
changed = _dirtyKeys.Select(key =>
{
var buffer = _serializer.Serialize(_version, _snapshots[key]);
if (!_offsets.TryGetValue(key, out var offset))
{
offset = _currOffset;
_offsets.Add(key, offset);
_currOffset += _bufSizeLen + buffer.Length;
}
return(Tuple.Create(offset, buffer));
}).OrderBy(t => t.Item1).ToArray();
}
else
{
_offsets.Clear();
_currOffset = _versionLen;
changed = _snapshots.Select(pair =>
{
var buffer = _serializer.Serialize(_version, pair.Value);
var offset = _currOffset;
_offsets.Add(pair.Key, offset);
_currOffset += _bufSizeLen + buffer.Length;
return(Tuple.Create(offset, buffer));
}).OrderBy(t => t.Item1).ToArray();
}
_dirtyKeys.Clear();
}
Debug.WriteLine($"Snapshot (Save): {_fileName}");
Directory.CreateDirectory(Path.GetDirectoryName(_fileName));
using (var stream = File.OpenWrite(_fileName))
{
if (stream.Length == 0)
{
stream.WriteByte((byte)_version.Major);
stream.WriteByte((byte)_version.Minor);
}
foreach (var tuple in changed)
{
stream.Seek(tuple.Item1, SeekOrigin.Begin);
stream.Write(tuple.Item2);
}
}
}