public async ValueTask <uint> GetNextPageNoToWriteAsync(int tocIndex, int dataSize)
{
var(position, length) = await GetPagePositionAllocationToc(tocIndex, false);
if (length == 0)
{
return(await GetTheEndOfTheFileAsync());
}
var nowTakenPages = MyAzurePageBlobUtils.CalculateRequiredPagesAmount(length);
var newSizePages = MyAzurePageBlobUtils.CalculateRequiredPagesAmount(dataSize);
if (nowTakenPages >= newSizePages)
{
return(position);
}
return(await GetTheEndOfTheFileAsync());
}
public async Task <CompressedPage> ReadAsync(MessagePageId pageId)
{
try
{
//If we do not have exceptions - can remove this try/catch
GetPageTocIndex(pageId);
}
catch (Exception e)
{
Console.WriteLine("Can not get TocIndex for page: " + pageId.Value + "; TopicId:" + TopicId);
Console.WriteLine(e);
throw;
}
var tocIndex = GetPageTocIndex(pageId);
var(position, length) = await GetPagePositionAllocationToc(tocIndex, false);
if (length == 0)
{
return(CompressedPage.CreateEmpty(pageId));
}
try
{
//If we do not have exceptions - can remove this try/catch
var fullPages = MyAzurePageBlobUtils.CalculateRequiredPagesAmount(length);
var result = await AzurePageBlob.ReadAsync(position, fullPages);
var buffer = result.GetBuffer();
return(new CompressedPage(pageId, new ReadOnlyMemory <byte>(buffer, 0, (int)length)));
}
catch (Exception)
{
Console.WriteLine("Problem with reading page: " + pageId + " TocIndex: " + tocIndex + "; position:" + position + " Length:" + length);
return(CompressedPage.CreateEmpty(pageId));
}
}
