public Page GetReadOnlyPage(long pageNumber)
{
Page p;
PageFromScratchBuffer value;
if (_scratchPagesTable.TryGetValue(pageNumber, out value))
{
PagerState state = null;
if (_scratchPagerStates != null)
{
var lastUsed = lastScratchFileUsed;
if (lastUsed.FileNumber == value.ScratchFileNumber)
{
state = lastUsed.State;
}
else
{
state = _scratchPagerStates[value.ScratchFileNumber];
lastScratchFileUsed = new PagerStateCacheItem(value.ScratchFileNumber, state);
}
}
p = _env.ScratchBufferPool.ReadPage(value.ScratchFileNumber, value.PositionInScratchBuffer, state);
}
else
{
p = _journal.ReadPage(this, pageNumber, _scratchPagerStates) ?? _dataPager.Read(pageNumber);
}
Debug.Assert(p != null && p.PageNumber == pageNumber, string.Format("Requested ReadOnly page #{0}. Got #{1} from {2}", pageNumber, p.PageNumber, p.Source));
return(p);
}
public static Dictionary <long, JournalFile.PagePosition> GetTransactionToPageTranslation(this TransactionHeader current, IVirtualPager pager, ref int currentPage)
{
var tempTransactionPageTranslaction = new Dictionary <long, JournalFile.PagePosition>();
for (var i = 0; i < current.PageCount; i++)
{
Debug.Assert(pager.Disposed == false);
var page = pager.Read(currentPage);
tempTransactionPageTranslaction[page.PageNumber] = new JournalFile.PagePosition
{
JournalPos = currentPage,
TransactionId = current.TransactionId
};
if (page.IsOverflow)
{
var numOfPages = pager.GetNumberOfOverflowPages(page.OverflowSize);
currentPage += numOfPages;
}
else
{
currentPage++;
}
}
return(tempTransactionPageTranslaction);
}
public void ReadTransactions(IEnumerable <TransactionToShip> shippedTransactions)
{
foreach (var transaction in shippedTransactions.OrderBy(x => x.Header.TransactionId))
{
ReadFromShippedTransaction(transaction);
}
var pageData = new byte *[_pageNumbers.Count];
_pageNumbers.ForEach(pageNumber => pageData[pageNumber] = _pager.Read(pageNumber).Base);
RawPageData = pageData;
}
public Page GetReadOnlyPage(long pageNumber)
{
PageFromScratchBuffer value;
Page p;
if (_scratchPagesTable.TryGetValue(pageNumber, out value))
{
p = _env.ScratchBufferPool.ReadPage(value.ScratchFileNumber, value.PositionInScratchBuffer, _scratchPagerStates != null ? _scratchPagerStates[value.ScratchFileNumber] : null);
}
else
{
p = _journal.ReadPage(this, pageNumber, _scratchPagerStates) ?? _dataPager.Read(pageNumber);
}
Debug.Assert(p != null && p.PageNumber == pageNumber, string.Format("Requested ReadOnly page #{0}. Got #{1} from {2}", pageNumber, p.PageNumber, p.Source));
return(p);
}
private bool TryReadAndValidateHeader(StorageEnvironmentOptions options, out TransactionHeader *current)
{
current = (TransactionHeader *)_pager.Read(_readingPage).Base;
if (current->HeaderMarker != Constants.TransactionHeaderMarker)
{
// not a transaction page,
// if the header marker is zero, we are probably in the area at the end of the log file, and have no additional log records
// to read from it. This can happen if the next transaction was too big to fit in the current log file. We stop reading
// this log file and move to the next one.
RequireHeaderUpdate = current->HeaderMarker != 0;
if (RequireHeaderUpdate)
{
options.InvokeRecoveryError(this,
"Transaction " + current->TransactionId +
" header marker was set to garbage value, file is probably corrupted", null);
}
return(false);
}
ValidateHeader(current, LastTransactionHeader);
if (current->TxMarker.HasFlag(TransactionMarker.Commit) == false)
{
// uncommitted transaction, probably
RequireHeaderUpdate = true;
options.InvokeRecoveryError(this,
"Transaction " + current->TransactionId +
" was not committed", null);
return(false);
}
_readingPage++;
return(true);
}
public Page ReadPage(long p, PagerState pagerState = null)
{
return(_scratchPager.Read(p, pagerState));
}
public bool ReadOneTransaction(StorageEnvironmentOptions options, bool checkCrc = true)
{
if (_readingPage >= _pager.NumberOfAllocatedPages)
{
return(false);
}
if (MaxPageToRead != null && _readingPage >= MaxPageToRead.Value)
{
return(false);
}
TransactionHeader *current;
if (!TryReadAndValidateHeader(options, out current))
{
return(false);
}
var transactionSize = GetNumberOfPagesFromSize(current->Compressed ? current->CompressedSize : current->UncompressedSize);
if (current->TransactionId <= _lastSyncedTransactionId)
{
LastTransactionHeader = current;
_readingPage += transactionSize;
return(true); // skipping
}
if (checkCrc && !ValidatePagesCrc(options, transactionSize, current))
{
return(false);
}
_recoveryPager.EnsureContinuous(null, _recoveryPage, (current->PageCount + current->OverflowPageCount) + 1);
var dataPage = _recoveryPager.AcquirePagePointer(_recoveryPage);
UnmanagedMemory.Set(dataPage, 0, (current->PageCount + current->OverflowPageCount) * AbstractPager.PageSize);
if (current->Compressed)
{
if (TryDecompressTransactionPages(options, current, dataPage) == false)
{
return(false);
}
}
else
{
Memory.Copy(dataPage, _pager.AcquirePagePointer(_readingPage), (current->PageCount + current->OverflowPageCount) * AbstractPager.PageSize);
}
var tempTransactionPageTranslaction = new Dictionary <long, RecoveryPagePosition>();
for (var i = 0; i < current->PageCount; i++)
{
Debug.Assert(_pager.Disposed == false);
Debug.Assert(_recoveryPager.Disposed == false);
var page = _recoveryPager.Read(_recoveryPage);
var pagePosition = new RecoveryPagePosition
{
JournalPos = _recoveryPage,
TransactionId = current->TransactionId
};
if (page.IsOverflow)
{
var numOfPages = _recoveryPager.GetNumberOfOverflowPages(page.OverflowSize);
pagePosition.IsOverflow = true;
pagePosition.NumberOfOverflowPages = numOfPages;
_recoveryPage += numOfPages;
}
else
{
_recoveryPage++;
}
tempTransactionPageTranslaction[page.PageNumber] = pagePosition;
}
_readingPage += transactionSize;
LastTransactionHeader = current;
foreach (var pagePosition in tempTransactionPageTranslaction)
{
_transactionPageTranslation[pagePosition.Key] = pagePosition.Value;
if (pagePosition.Value.IsOverflow)
{
Debug.Assert(pagePosition.Value.NumberOfOverflowPages != -1);
for (int i = 1; i < pagePosition.Value.NumberOfOverflowPages; i++)
{
_transactionPageTranslation.Remove(pagePosition.Key + i);
}
}
}
return(true);
}
public Page ReadPage(Transaction tx, long p, PagerState pagerState = null)
{
return(_scratchPager.Read(tx, p, pagerState));
}
public bool ReadOneTransaction(StorageEnvironmentOptions options, bool checkCrc = true)
{
if (_readingPage >= _pager.NumberOfAllocatedPages)
{
return(false);
}
TransactionHeader *current;
if (!TryReadAndValidateHeader(options, out current))
{
return(false);
}
var compressedPages = (current->CompressedSize / AbstractPager.PageSize) + (current->CompressedSize % AbstractPager.PageSize == 0 ? 0 : 1);
if (current->TransactionId <= _lastSyncedTransactionId)
{
LastTransactionHeader = current;
_readingPage += compressedPages;
return(true); // skipping
}
if (checkCrc)
{
uint crc = Crc.Value(_pager.AcquirePagePointer(_readingPage), 0, compressedPages * AbstractPager.PageSize);
if (crc != current->Crc)
{
RequireHeaderUpdate = true;
options.InvokeRecoveryError(this, "Invalid CRC signature for transaction " + current->TransactionId, null);
return(false);
}
}
_recoveryPager.EnsureContinuous(null, _recoveryPage, (current->PageCount + current->OverflowPageCount) + 1);
var dataPage = _recoveryPager.AcquirePagePointer(_recoveryPage);
NativeMethods.memset(dataPage, 0, (current->PageCount + current->OverflowPageCount) * AbstractPager.PageSize);
try
{
LZ4.Decode64(_pager.AcquirePagePointer(_readingPage), current->CompressedSize, dataPage, current->UncompressedSize, true);
}
catch (Exception e)
{
options.InvokeRecoveryError(this, "Could not de-compress, invalid data", e);
RequireHeaderUpdate = true;
return(false);
}
var tempTransactionPageTranslaction = new Dictionary <long, JournalFile.PagePosition>();
for (var i = 0; i < current->PageCount; i++)
{
Debug.Assert(_pager.Disposed == false);
Debug.Assert(_recoveryPager.Disposed == false);
var page = _recoveryPager.Read(_recoveryPage);
tempTransactionPageTranslaction[page.PageNumber] = new JournalFile.PagePosition
{
JournalPos = _recoveryPage,
TransactionId = current->TransactionId
};
if (page.IsOverflow)
{
var numOfPages = _recoveryPager.GetNumberOfOverflowPages(page.OverflowSize);
_recoveryPage += numOfPages;
}
else
{
_recoveryPage++;
}
}
_readingPage += compressedPages;
LastTransactionHeader = current;
foreach (var pagePosition in tempTransactionPageTranslaction)
{
_transactionPageTranslation[pagePosition.Key] = pagePosition.Value;
}
return(true);
}
