protected override long GetWritePositionLocked(OperationHint hint, int length)
{
var contentHint = hint as OptimizedOperation ?? throw new ArgumentException(nameof(hint));
var retv = -1L;
lock (_blocksLockObject)
{
if (!TryGetAvailableBlock(length, out var block))
{
retv = CurrentPosition;
}
else
{
contentHint.IsExistingBlockUsed = true;
retv = block.Position;
if (block.Length <= length)
{
return(retv);
}
var generatedBlock = new DriveBlock
{
Length = block.Length - length,
Position = block.Position + length
};
AddAvailableBlock(generatedBlock);
contentHint.GeneratedAvailableBlock = generatedBlock;
}
}
return(retv);
}
protected override void SetCurrentPositionLocked(OperationHint hint, int writtenBytesCount)
{
var contentHint = hint as OptimizedOperation ?? throw new ArgumentException(nameof(hint));
if (contentHint.IsExistingBlockUsed)
{
return;
}
CurrentPosition += writtenBytesCount;
}
protected override WriteOperation MakeOperation(OperationHint hint, byte[] bytes, long position)
{
return(new FileTableOperation(drive => drive.Write(position, bytes), position));
}
protected abstract WriteOperation MakeOperation(OperationHint hint, byte[] bytes, long position);
protected virtual void SetCurrentPositionLocked(OperationHint hint, int writtenBytesCount)
{
CurrentPosition += writtenBytesCount;
}
protected virtual long GetWritePositionLocked(OperationHint hint, int length)
{
return(CurrentPosition);
}
