public PersistedStream(ulong startFileSize, string fileName, bool createNew, InstrumentationInterface logger)
{
this.logger = logger;
string shadowFileName = fileName + ".shadow";
if (File.Exists(fileName) && !createNew)
{
this.fileStream = new FileStream(fileName, FileMode.Open, FileAccess.ReadWrite);
this.fileStreamShadow = new FileStream(shadowFileName, FileMode.Open, FileAccess.ReadWrite);
isInitialized = true;
}
else
{
if (File.Exists(fileName))
{
File.Delete(fileName);
File.Delete(shadowFileName);
}
this.fileStream = new FileStream(fileName, FileMode.CreateNew, FileAccess.ReadWrite);
this.fileStream.SetLength((long)startFileSize);
this.fileStreamShadow = new FileStream(shadowFileName, FileMode.CreateNew, FileAccess.ReadWrite);
isInitialized = false;
}
this.binaryWriter = new BinaryWriter(this.fileStream);
this.binaryReader = new BinaryReader(this.fileStream);
this.binaryReaderShadow = new BinaryReader(this.fileStreamShadow);
this.binaryWriterShadow = new BinaryWriter(this.fileStreamShadow);
this.fileName = fileName;
}
public PageManager(uint defaultPageSize, IPersistedStream persistedStream, IBufferPool bufferPool, ILockManager lockManager, InstrumentationInterface logger)
{
this.pageSize = defaultPageSize;
this.persistedStream = persistedStream;
this.lockManager = lockManager;
this.logger = logger;
this.bufferPool = bufferPool;
this.AllocatationMapPages = new List <BitTrackingPage>();
if (!this.persistedStream.IsInitialized())
{
logger.LogInfo("Initializing the persisted stream.");
using (ITransaction tran = new NotLoggedTransaction())
{
MixedPage allocationMapFirstPage = new MixedPage(pageSize, (ulong)AllocationMapPageId, new [] { new ColumnInfo(ColumnType.Int) }, PageManagerConstants.NullPageId, PageManagerConstants.NullPageId, new byte[4096], 0, tran);
BitTrackingPage.NullifyMixedPage(allocationMapFirstPage, tran);
this.AllocatationMapPages.Add(new BitTrackingPage(allocationMapFirstPage));
this.persistedStream.MarkInitialized();
}
}
else
{
// TODO: Read boot page.
logger.LogInfo("Using already initialized stream.");
ulong position = AllocationMapPageId * this.pageSize;
MixedPage allocationMapFirstPage = (MixedPage)this.persistedStream.SeekAndRead(position, PageType.MixedPage, this.bufferPool, new ColumnInfo[] { new ColumnInfo(ColumnType.Int) }).Result;
this.AllocatationMapPages.Add(new BitTrackingPage(allocationMapFirstPage));
using (ITransaction tran = new NotLoggedTransaction())
{
// TODO: Here we only iterate the first page.
// These pages need to be linked...
foreach (int _ in this.AllocatationMapPages.First().FindAllSet(tran))
{
this.pageCount++;
}
}
}
}
