internal DatabaseCreationBuilder(string path, Guid versionCheck)
{
this.path = path;
this.versionCheck = versionCheck;
buffer = new byte[8192];
headers = new List <ArrayHeader>();
stream = new FileStream(path, FileMode.Create, FileAccess.Write, FileShare.Read);
db = new Database(() => Database.Open(FileShare.ReadWrite | FileShare.Delete, path), headers);
try
{
stream.Write(BitConverter.GetBytes(0L));
stream.Write(versionCheck.ToByteArray());
}
catch
{
stream.Dispose();
db.Dispose();
}
}
public void Dispose()
{
db.Dispose();
}
public override DatabaseBuilder AddIndirectArray <T, TKey>(
ISerializer <T> serializer,
Func <Database, IEnumerable <T> > elements,
Func <T, TKey> selector,
IComparer <TKey>?comparer)
{
try
{
var headerPosition = stream.Position;
// write a dummy header
var dummyHeaderBytes = new ArrayHeader(serializer).AsBytes();
stream.Write(dummyHeaderBytes);
var pointersArrayOffsetPosition = stream.Position;
stream.Write(BitConverter.GetBytes(0L));
var dataStartPosition = stream.Position;
long elementCount = 0;
// TODO: less lazy way
var offsetList = new List <long>();
var elementsEnumerable = elements(db);
if (comparer != null)
{
elementsEnumerable = elementsEnumerable.OrderBy(selector, comparer);
}
foreach (var element in elementsEnumerable)
{
int actualLength;
while (!serializer.TrySerialize(element, buffer.AsSpan(), out actualLength))
{
Utility.Reallocate(ref buffer);
}
offsetList.Add(stream.Position - dataStartPosition);
stream.Write(BitConverter.GetBytes(actualLength));
stream.Write(buffer, 0, actualLength);
elementCount++;
}
var pointerArrayPosition = stream.Position;
stream.Position += elementCount * sizeof(long);
var pastEndPosition = stream.Position;
stream.Seek(headerPosition, SeekOrigin.Begin);
var arrayHeader = new ArrayHeader(serializer)
{
OverallLength = pastEndPosition - pointersArrayOffsetPosition,
RecordCount = elementCount,
StartsAt = pointersArrayOffsetPosition,
EndsAt = pastEndPosition,
Type = 2
};
stream.Write(arrayHeader.AsBytes());
stream.Write(BitConverter.GetBytes(pointerArrayPosition - pointersArrayOffsetPosition));
stream.Seek(pointerArrayPosition, SeekOrigin.Begin);
foreach (var off in offsetList)
{
stream.Write(BitConverter.GetBytes(off));
}
stream.Seek(pastEndPosition, SeekOrigin.Begin);
headers.Add(arrayHeader);
}
catch
{
stream.Dispose();
db.Dispose();
throw;
}
return(this);
}
