private void EnsureSizeOrResize(int bytes)
{
// since lucene does not do random writes, we can safely assume
// that there have been no bytes written beyond the last recorded
// blob position when the blob has been already sized to be large
// enough to accomodate the minSize bytes specified.
// this would only be from a previous resize operation having
// grown the file to a large enough size and not all bytes being
// used up thereafter.
if (_lastPageOffset > _currPagePosition + bytes)
{
// no need to resize.
return;
}
// calculate number of new pages to add w/ a buffer of 512KB.
long newLastPageOffset = GetCurrentPageOffset() + ((bytes / PageSize) * PageSize) + 512;
// resize blob.
_ = _pageBlobClient.Resize(newLastPageOffset);
// save actual bytes required.
_metadata["actuallength"] = bytes.ToString();
_pageBlobClient.SetMetadata(_metadata);
// record the new offset for the last page.
_lastPageOffset = newLastPageOffset;
}
