private void UpdatePageTranslationTable(LowLevelTransaction tx, HashSet <PagePosition> unused, Dictionary <long, PagePosition> ptt)
{
foreach (var freedPageNumber in tx.GetFreedPagesNumbers())
{
// set freed page marker - note it can be overwritten below by later allocation
ptt[freedPageNumber] = new PagePosition
{
ScratchPos = -1,
ScratchNumber = -1,
TransactionId = tx.Id,
JournalNumber = Number,
IsFreedPageMarker = true
};
}
var txPages = tx.GetTransactionPages();
foreach (var txPage in txPages)
{
var scratchPage = tx.Environment.ScratchBufferPool.ReadPage(tx, txPage.ScratchFileNumber, txPage.PositionInScratchBuffer);
var pageNumber = scratchPage.PageNumber;
PagePosition value;
if (_pageTranslationTable.TryGetValue(tx, pageNumber, out value))
{
value.UnusedInPTT = true;
unused.Add(value);
}
PagePosition pagePosition;
if (ptt.TryGetValue(pageNumber, out pagePosition) && pagePosition.IsFreedPageMarker == false)
{
unused.Add(pagePosition);
}
ptt[pageNumber] = new PagePosition
{
ScratchPos = txPage.PositionInScratchBuffer,
ScratchNumber = txPage.ScratchFileNumber,
TransactionId = tx.Id,
JournalNumber = Number
};
}
foreach (var freedPage in tx.GetUnusedScratchPages())
{
unused.Add(new PagePosition
{
ScratchPos = freedPage.PositionInScratchBuffer,
ScratchNumber = freedPage.ScratchFileNumber,
TransactionId = tx.Id,
JournalNumber = Number
});
}
}
private void UpdatePageTranslationTable(LowLevelTransaction tx, HashSet <PagePosition> unused, Dictionary <long, PagePosition> ptt)
{
// REVIEW: This number do not grow easily. There is no way we can go higher than int.MaxValue
// Make sure that we upgrade later upwards so journal numbers are always ints.
long journalNumber = Number;
foreach (var freedPageNumber in tx.GetFreedPagesNumbers())
{
// set freed page marker - note it can be overwritten below by later allocation
ptt[freedPageNumber] = new PagePosition(-1, tx.Id, journalNumber, -1, true);
}
var scratchBufferPool = tx.Environment.ScratchBufferPool;
var txPages = tx.GetTransactionPages();
foreach (var txPage in txPages)
{
long pageNumber = txPage.ScratchPageNumber;
if (pageNumber == -1) // if we don't already have it from TX preparing then ReadPage
{
var scratchPage = scratchBufferPool.ReadPage(tx, txPage.ScratchFileNumber, txPage.PositionInScratchBuffer);
pageNumber = scratchPage.PageNumber;
}
Debug.Assert(pageNumber >= 0);
PagePosition value;
if (_pageTranslationTable.TryGetValue(tx, pageNumber, out value))
{
value.UnusedInPTT = true;
unused.Add(value);
}
PagePosition pagePosition;
if (ptt.TryGetValue(pageNumber, out pagePosition) && pagePosition.IsFreedPageMarker == false)
{
unused.Add(pagePosition);
}
ptt[pageNumber] = new PagePosition(txPage.PositionInScratchBuffer, tx.Id, journalNumber, txPage.ScratchFileNumber);
}
foreach (var freedPage in tx.GetUnusedScratchPages())
{
unused.Add(new PagePosition(freedPage.PositionInScratchBuffer, tx.Id, journalNumber, freedPage.ScratchFileNumber));
}
}