public override async ValueTask Read(TComposite composite, NpgsqlReadBuffer buffer, bool async, CancellationToken cancellationToken = default)
{
if (_set == null)
{
ThrowHelper.ThrowInvalidOperationException_NoPropertySetter(typeof(TComposite), MemberInfo);
}
await buffer.Ensure(sizeof(uint) + sizeof(int), async, cancellationToken);
var oid = buffer.ReadUInt32();
Debug.Assert(oid == PostgresType.OID);
var length = buffer.ReadInt32();
if (length == -1)
{
return;
}
var value = NullableHandler <TMember> .Exists
? await NullableHandler <TMember> .ReadAsync(_handler, buffer, length, async, cancellationToken : cancellationToken)
: await _handler.Read <TMember>(buffer, length, async, cancellationToken : cancellationToken);
_set(composite, value);
}
T DoRead <T>(NpgsqlTypeHandler handler)
{
try {
ReadColumnLenIfNeeded();
if (_columnLen == -1)
{
throw new InvalidCastException("Column is null");
}
// If we know the entire column is already in memory, use the code path without async
var result = _columnLen <= _buf.ReadBytesLeft
? handler.Read <T>(_buf, _columnLen)
: handler.Read <T>(_buf, _columnLen, false).GetAwaiter().GetResult();
_leftToReadInDataMsg -= _columnLen;
_columnLen = int.MinValue; // Mark that the (next) column length hasn't been read yet
_column++;
return(result);
} catch {
_connector.Break();
Cleanup();
throw;
}
}
